CN203641609U - Electronic expansion valve - Google Patents

Abstract

The utility model relates to an electronic expansion valve, include: a valve assembly; the actuating mechanism comprises a mandrel and is used for driving the movable valve component to axially move; a drive mechanism for powering the actuator; and an electromagnetic holding mechanism including a moving iron and adapted to hold and release the actuator, the spindle being capable of driving the movable valve member to perform an axial movement so as to adjust a valve opening of the electronic expansion valve when the electromagnetic holding mechanism holds the actuator in a power-on condition, the movable valve member being moved to a position at which the electronic expansion valve is closed when the electromagnetic holding mechanism releases the actuator in a power-off condition, wherein the spindle is screw-coupled with the moving iron so that the spindle is rotatable relative to the moving iron, and the electronic expansion valve is provided with a rotation prevention structure so that the moving iron is only capable of a translational movement in an axial direction of the electronic expansion valve and is not capable of a rotational movement. According to the utility model discloses, realize electronic expansion valve's outage self preservation and protect the function with effectual mode more reliably.

Description

Electric expansion valve

Technical field

The utility model relates to a kind of electric expansion valve.

Background technique

Electric expansion valve is the vitals in cooling/heating system, is mainly used in the flow of refrigerant fluid to regulate.Traditional electric expansion valve generally adopts stepper motor to control, and is conventionally made up of driving mechanism (stepper motor), actuator (thread screw mechanism), throttle mechanism (needle valve seat) and relevant assisting agency.

In the art; have the demand that by Design of Mechanical Structure, thereby the feature integration of closing voluntarily after solenoid valve power-off is realized in electric expansion valve dexterously to the automatic cut-off protection protective function of electric expansion valve, and existence conforms to the automatic cut-off protection protective function of electric expansion valve and develops the demand of the reliable and effective thread screw mechanism (screw pair is connected) making new advances.

Here, it should be pointed out that the technology contents providing in this part is intended to contribute to those skilled in the art to understanding of the present utility model, and not necessarily form prior art.

Model utility content

Total summary of the present utility model is provided in this part, instead of characteristic comprehensive the disclosing of the complete scope of the utility model or the utility model institute.

An object of one or more mode of executions of the present utility model is to provide a kind of electric expansion valve of by Design of Mechanical Structure, thereby the feature integration of closing voluntarily after solenoid valve power-off being realized in electric expansion valve dexterously to the automatic cut-off protection protective function of electric expansion valve.

Another object of one or more mode of executions of the present utility model is to provide a kind of can avoiding and kills and the electric expansion valve of wear problem because of rotor and the axle screw pair that excessively rotation causes.

Another object of one or more mode of executions of the present utility model is to provide a kind of one side moving iron after accident power-off and departs from and the in the situation that of determining iron, iron can be returned to reliably and reposefully also can to guarantee on the other hand with determining the state of ferromagnetism adhesive axle to carry out axial motion to realize reliably and the electric expansion valve of threshold switch process stably together with needle.

Another object of one or more mode of executions of the present utility model is to provide a kind ofly can reduce risk that to rock appear in the needle coupling member that may be caused by the operation of screw connection structure and then needle, can realize more reliably and the electric expansion valve of threshold switch process stably thus.

Another object of one or more mode of executions of the present utility model is to provide a kind ofly can be avoided adopting the component such as bearing and bearing limit position part and cause structure complicated and can exempt because moving iron is likely followed the rotation of axle and caused determining to occur between iron and moving iron the electric expansion valve of the situation of improper wearing and tearing with respect to determining iron rotation.

Another object of one or more mode of executions of the present utility model is to provide a kind of electric expansion valve of realizing the automatic cut-off protection protective function of electric expansion valve in more reliable and effective mode.

One or more to achieve these goals, according to the utility model, provide a kind of electric expansion valve, comprising: valve assembly, and described valve assembly comprises movable valve member and for the flow of the fluid that flows through described electric expansion valve is regulated, actuator, described actuator comprises axle and for driving described movable valve member to carry out axial motion, driving mechanism, described driving mechanism is used to described actuator that power is provided, and electromagnetism retaining mechanism, described electromagnetism retaining mechanism comprises moving iron and is suitable for by electromagnetic attraction force retaining and discharges described actuator, in the time that described electromagnetism retaining mechanism keeps described actuator in energising situation, described axle can drive described movable valve member to carry out axial motion to regulate the valve opening of described electric expansion valve, in the time that described electromagnetism retaining mechanism discharges described actuator under powering-off state, described movable valve member moves to the position that described electric expansion valve is closed, wherein, described axle is threaded with described moving iron, described axle can be rotated with respect to described moving iron, and, described electric expansion valve is provided with anti-rotation structure, make described moving iron be merely able to carry out translational motion and can not be rotated along the axial direction of described electric expansion valve.

According in electric expansion valve of the present utility model, described movable valve member is needle, and described valve assembly also comprises valve seat, and, thereby described needle is suitable for engaging described electric expansion valve being closed with described valve seat.

According in electric expansion valve of the present utility model, described actuator also comprises needle coupling member, and described needle is attached to described axle via described needle coupling member.

According in electric expansion valve of the present utility model, described needle coupling member comprises first portion and second portion, and described first portion is fixedly connected to described axle, described needle with axially slidably mode be attached to described second portion.

According in electric expansion valve of the present utility model, the first Compress Spring that applies spring force to described needle is set between described needle coupling member and described needle.

According in electric expansion valve of the present utility model, second portion place at described needle coupling member arranges receiving bore, one end of described the first Compress Spring and described needle is arranged in described receiving bore, makes described the first Compress Spring between described one end of described needle coupling member and described needle.

According in electric expansion valve of the present utility model, inner wall surface place in the lower end of described receiving bore arranges circular groove, described electric expansion valve also comprises back-up ring, thereby described back-up ring be arranged in described circular groove can with the first step portion butt of periphery that is formed on described needle, limit thus described needle and deviate from from described needle coupling member.

According in electric expansion valve of the present utility model, described back-up ring is embodied as with removably and is arranged in the special-shaped circlip in described circular groove.

According in electric expansion valve of the present utility model, described back-up ring comprises elastic body portion and a pair of grasping part of general toroidal, and extend from the associated end of described elastic body portion respectively each described grasping part.

According in electric expansion valve of the present utility model, described driving mechanism comprises rotor, and described rotor is embodied as and forms with described axle or cylindric magnet ring that be permanently connected, an end opening.

According in electric expansion valve of the present utility model, in described actuator, be provided for the stop bit mechanism of the rotating range that limits described axle.

According in electric expansion valve of the present utility model, described stop bit mechanism comprises: spring helical guideway; Slip ring; And guide finger.

According in electric expansion valve of the present utility model, described axle comprises male end, and described moving iron comprises interior threaded hole, described axle is threaded described in can realizing with described moving iron thus, or, described axle comprises interior threaded hole, and described moving iron comprises outstanding bolt part, and described axle is threaded described in can realizing with described moving iron thus.

According in electric expansion valve of the present utility model, described electromagnetism retaining mechanism also comprises: the electromagnetic coil that produces magnetic attraction in the time of energising; And with respect to described electromagnetic coil fixing, be suitable for and the iron of determining of described moving ferromagnetism adhesive.

According in electric expansion valve of the present utility model, described moving iron is provided for the non-circular or polygonal periphery of at least a portion that forms described anti-rotation structure at least a portion in axial direction.

According in electric expansion valve of the present utility model, described electric expansion valve comprises anti-rotation member, described anti-rotation member has through hole, described through hole be provided with the non-circular or polygonal of the non-circular of described moving iron or polygonal periphery at least a portion that match, that be used to form described anti-rotation structure in week.

According in electric expansion valve of the present utility model, described anti-rotation member be form the outward appearance of described electric expansion valve at least a portion housing or be connected in regularly the sleeve in the through hole of described housing.

According in electric expansion valve of the present utility model, described moving iron comprises First section and second section, and described First section has circular circumference, and described second section has the circle of cutting a shape periphery, and the through hole of described housing has cutting week in circle shape of matching.

According in electric expansion valve of the present utility model, described moving iron is formed as having the groove extending along whole axial direction in periphery, and described housing is formed as having at the place of interior week of the through hole of described housing the convex ridge matching with described groove.

According in electric expansion valve of the present utility model, described moving iron is formed as having the groove extending along whole axial direction in periphery, and, there is at the place of interior week of the through hole of described sleeve the convex ridge matching with described groove.

According in electric expansion valve of the present utility model, described moving iron has cylindrical circular First section and is second section of octahedra shape, and the through hole of described sleeve is general square shape and is suitable for holding second section of described moving iron.

According in electric expansion valve of the present utility model, described electric expansion valve also comprises supporting element, described supporting element be suitable for the collar of the office, bottom that is arranged on described axle of described axle and with first portion's slip joint of described needle coupling member.

According in electric expansion valve of the present utility model, be formed with second step portion in the periphery of described needle coupling member, between described second step portion and described supporting element, the second Compress Spring is set, described the second Compress Spring is suitable for providing spring force for described needle coupling member.

According to one or more mode of executions of the present utility model, thereby by Design of Mechanical Structure, the feature integration of closing voluntarily after solenoid valve power-off is realized in electric expansion valve dexterously to the automatic cut-off protection protective function of electric expansion valve.Especially; with the scheme that adopts the mode of independent solenoid valve of directly connecting to realize power-off protection function (in this scheme; consider pressure drop; thereby the passage section of independent solenoid valve conventionally large cost is very high) compare; can realize the reliability of compact structure and Geng Gao more; can make terminal equipment business save the on-the-spot soldering processes of twice, and can reduce costs widely.In addition, thereby realize to power in the finite time after power-off compared with the scheme of valve closing with increase the super capacitor of realizing energy storage in electronic expansion valve controls plate, can avoid valve to support the use with specific controller, super capacitor cost is very high, controller to working environment than more sensitive relevant issues.In addition, and reserve battery is installed in electronic expansion valve controls plate can continue to carry out compared with the scheme of valve closing after power-off, can be avoided regularly replacing the relevant issues of battery and not environmental protection (lead-acid battery has harmful effect to environment).

According to one or more mode of executions of the present utility model, owing to being provided with stop bit mechanism, therefore can suitably limit the rotation of axle.Thus, for example, in the standard-sized sheet and full close position of valve, can avoid killing and wear problem because of rotor and the axle screw pair that excessively rotation causes, thereby ensure the smooth transmission of screw pair.

According to one or more mode of executions of the present utility model, owing to anti-rotation structure being set between anti-rotation member (housing) and moving iron and between moving iron and axle, screw connection structure being set, therefore on the one hand accident power-off after, moving iron departs from the in the situation that of determine iron iron can be returned to and the state of determining ferromagnetism adhesive reliably and reposefully, and also can guarantee that on the other hand axle carries out axial motion to realize reliably and threshold switch process stably together with needle.Particularly, according to mode of execution of the present utility model, owing between moving iron and axle, screw connection structure being set, compared with the scheme of screw connection structure is set between axle and needle coupling member, can make screw connection structure further from for realizing the needle end (lower end) that closes valve, thereby the risk of rocking appears in needle coupling member and then the needle that can reduce may be caused by the operation of screw connection structure, can realize thus more reliable and threshold switch process stably.

According to one or more mode of executions of the present utility model, owing to anti-rotation structure being set between anti-rotation member (housing) and moving iron and between moving iron and axle, screw connection structure being set, with between moving iron and axle, compare with the scheme that bearing limit position part etc. is connected by bearing, can avoid adopting the component such as bearing and bearing limit position part and cause structure complicated, and can exempt because moving iron is likely followed the rotation of axle and rotated with respect to determining iron the situation that causes determining to occur between iron and moving iron improper wearing and tearing.

Especially, according to one or more mode of executions of the present utility model, realize the automatic cut-off protection protective function of electric expansion valve in more reliable and effective mode.

Brief description of the drawings

By the description referring to accompanying drawing, it is easier to understand that the feature and advantage of one or more mode of executions of the present utility model will become, in the accompanying drawings:

Fig. 1 is according to the longitudinal section of the electric expansion valve of mode of execution of the present utility model;

Fig. 2 is according to the view sub-anatomy of the electric expansion valve of mode of execution of the present utility model;

Fig. 3 is according to the exploded perspective view of the electric expansion valve of mode of execution of the present utility model;

Fig. 4 A is the sectional view that the matching relationship that moves iron and axle and housing is shown intercepting along the plane A-A in Fig. 1;

Fig. 4 B is the stereogram illustrating according to the moving iron of mode of execution of the present utility model;

Fig. 5 A is the sectional view illustrating according to the anti-rotation structure of the first modified example of mode of execution of the present utility model;

Fig. 5 B is the stereogram illustrating according to the moving iron with anti-rotation structure of the first modified example of mode of execution of the present utility model;

Fig. 6 A is the sectional view illustrating according to the anti-rotation structure of the second modified example of mode of execution of the present utility model;

Fig. 6 B illustrates according to the moving iron with anti-rotation structure of the second modified example of mode of execution of the present utility model and the stereogram of sleeve;

Fig. 7 A is the sectional view illustrating according to the anti-rotation structure of the 3rd modified example of mode of execution of the present utility model;

Fig. 7 B illustrates according to the moving iron with anti-rotation structure of the 3rd modified example of mode of execution of the present utility model and the stereogram of sleeve; And

Fig. 8 A, Fig. 8 B, Fig. 8 C and Fig. 8 D are a series of figure that illustrate according to the working procedure of the electric expansion valve of mode of execution of the present utility model

Embodiment

By illustrative embodiments, the utility model is described in detail with reference to the accompanying drawings.Be only for demonstration object to following detailed description of the present utility model, and be never the restriction to the utility model and application or purposes.

First, describe according to the general structure of the electric expansion valve of mode of execution of the present utility model with reference to Fig. 1 to Fig. 3.Wherein, Fig. 1 is according to the longitudinal section of the electric expansion valve of mode of execution of the present utility model, Fig. 2 is according to the view sub-anatomy of the electric expansion valve of mode of execution of the present utility model, and Fig. 3 is according to the exploded perspective view of the electric expansion valve of mode of execution of the present utility model.

Can comprise according to the electric expansion valve 1 of mode of execution of the present utility model: for the valve assembly 10 that the flow of the fluid that flows through electric expansion valve 1 is regulated; For driving the movable valve member (needle) of valve assembly 10 to carry out the actuator 50 of axial motion; For actuator 50 provides the driving mechanism 40 of power; And for keeping and discharge the electromagnetism retaining mechanism 60 of actuator 50.

In preferred example, valve assembly 10 comprises valve body 12.The entrance 12-1 being connected with inflow pipe 92 and the outlet 12-2 being connected with outflow tube 94 are set in valve body 12.Fluid flows into electric expansion valve 1 via inflow pipe 92, then flows out electric expansion valve 1 via outflow tube 94.

In some instances, formed standing valve member (valve seat) 12-3 at the outlet 12-2 place of valve body 12.

In preferred example, as mentioned above, the valve assembly 10 of electric expansion valve 1 also comprises needle 14.And, as mentioned above, needle 14 carries out axial motion (for example rotation in carry out axial motion) under the drive of actuator 50, is specially thereby can open and close valve seat 12-3(the valve opening being formed in valve seat 12-3) and can regulate the valve opening of electric expansion valve 1.Needle 14 can comprise first end (upper end) 14-1 and the second end (lower end) 14-2.First end 14-1 is used for and below the second portion (lower part/needle joint part) that does the needle coupling member of describing is connected.Thereby the second end 14-2 is for engaging and close valve seat 12-3 with valve seat 12-3.

In illustrated example, needle 14 is can (axially) slide type to be attached to the second portion 55-2 of needle coupling member 55.Particularly, in second portion 55-2, be formed with the receiving bore 55-21 of opening downward.Compress Spring (as according to the first Compress Spring of the present utility model) 38 can be set in receiving bore 55-21, and receiving bore 55-21 also can slide at receiving bore 55-21 first end 14-1 for holding the first end 14-1 of needle 14 in the mode being guided.Circular groove (not indicating) can be set at the inner wall surface place of the lower end of receiving bore 55-21, and this circular groove can will do the back-up ring of describing for holding below.The external diameter that needle 14 can be formed as first end 14-1 is greater than the external diameter of the second end 14-2, makes to be formed with in the outside/periphery of needle 14, between first end 14-1 and the second end 14-2 stepped part (as according to first step of the present utility model portion) 14-3.Back-up ring 36 can be set, and back-up ring 36 can be arranged in circular groove.Back-up ring 36 can with the stepped part 14-3 butt of needle 14, thereby restriction needle 14 moves away receiving bore 55-21 and then prevents that needle 14 from deviating from from needle coupling member 55.

Thus, needle 14 can carry out axial motion together with needle coupling member 55.And; when needle coupling member 55 moves down and needle 14 during with valve seat 12-3 butt; Compress Spring 38 applies spring force so that have suitable butt power between needle 14 and valve seat 12-3 from the first end 14-1 of needle 14; thereby on the one hand because of provide contact buffer function protect needle 14 and valve seat 12-3 not damaged, reliable sealing effect is provided on the other hand.

In preferred example, back-up ring 36 may be embodied as special-shaped circlip (especially referring to Fig. 3).Alternatively, back-up ring 36 can comprise elastic body portion and a pair of grasping part of general toroidal, and extend from the associated end of elastic body portion respectively each grasping part.Thus, can easily back-up ring 36 be assembled to manually to circular groove and from circular groove dismounting, thereby can be easily needle 14 and/or Compress Spring 38 be dismantled so that the operation such as for example change from needle coupling member 55.

Here it will be appreciated by those skilled in the art that needle 14 also can be attached to needle coupling member 55 in other suitable mode, or needle 14 even can form with needle coupling member 55.

In illustrated example, driving mechanism 40 can be the motor that comprises stator 41 and rotor 42.Rotor 42 can rotate in stator 41.In addition, can cylindrical shell 44 be set between stator 41 and rotor 42 to realize the object of easy to assembly and easy sealing.

In preferred example, rotor 42 is embodied as the cylindric magnet ring of an end opening, thereby limits rotor chamber 42-1.Below the stop bit mechanism of mentioning is arranged in rotor chamber 42-1 at least in part.

In addition, in preferred example, rotor 42 is injection molded into one with the axle 51 of actuator 50, and rotor 42 in the time of driving mechanism (motor) 40 energising is rotated integratedly with axle 51.But, it will be appreciated by those skilled in the art that rotor 42 and axle 51 also can be individually formed, and are then permanently connected together by suitable mode.

In preferred example, actuator 50 comprises: axle 51 as mentioned above; And needle coupling member 55 as mentioned above.

In some instances, axle 51 can comprise first end (upper end) 51-1 and the second end (lower end) 51-2.First end 51-1 can be formed with outside thread.First end (male end) 51-1 is used for and below lower section (internal thread part) 64-2 of the moving iron 64 that does the electromagnetism retaining mechanism 60 of describing is threaded, thereby force moving iron 64 to carry out axial motion (away from the upwards axial motion of axle 51) by the rotation of axle 51 in the situation that axle 51 axial restraints and moving iron 64 is circumferentially fixing, or force axle 51 itself to carry out axial motion (towards the upwards axial motion of moving iron 64) at moving iron 64 axial restraints (by determine iron adhesive) and circumferentially fixing in the situation that by the rotation of axle 51, this respect will below be described further.The second end 51-2 is for engaging with needle coupling member 55.

In illustrated example, can---above the vicinity of the second end 51-2 being specially in axle 51, locate---in the office, bottom of axle 51 collar 51-4 is set.Collar 51-4 is used for and below will does the 80-1 of the first portion slip joint of the supporting element 80 of describing, thus the rotatablely moving and axial motion with respect to supporting element 80 of guiding axle 51.In preferred example, collar 51-4 can be individually formed, and is then for example fixedly connected to the body of axle 51 by interference fit.In other example, collar 51-4 can form with the body of axle 51.

In preferred example, needle coupling member 55 comprises: the 55-1 of first portion (upper part/supporting element joining portion); And second portion (lower part/needle joint part) 55-2 as mentioned above.Thereby the 55-1 of first portion on the one hand for the second end 51-2 of axle 51 can move integratedly with axle 51 (axially move up and down and rotate in a circumferential direction motion) that be permanently connected, on the other hand for the second portion 80-2 slip joint of supporting element 80, thereby guide rotatablely moving of needle coupling member 55 and axial motion by supporting element 80.

In illustrated example, in the 55-1 of first portion, can be formed with jack 55-11, and the second end 51-2 of axle 51 can for example be inserted in jack 55-11 by interference fit regularly, thereby realize being fixedly connected with of needle coupling member 55 and axle 51.Here it will be appreciated by those skilled in the art that needle coupling member 55 also can be fixedly connected to axle 51 in other suitable mode, or needle coupling member 55 even can form with axle 51.

In illustrated example, the 55-1 of first portion can be cylindrical in shape, to realize as described above and the slip joint of the second portion 80-2 of supporting element 53.

In some instances, can be in the outside/periphery of needle coupling member 55, between the 55-1 of first portion's (upper part/supporting element joining portion) and second portion (time part/needle joint part) 55-2, be formed with stepped part (as according to second step of the present utility model portion) 55-4.Compress Spring (as according to the second Compress Spring of the present utility model) 39 can be set between stepped part 55-4 and supporting element 80.Compress Spring 39 can provide downward spring force for needle coupling member 55, moves to and makes needle 14 close the position of valve seat 12-3 together with needle 14, axle 51, rotor 42 and moving iron 64 with auxiliary needle coupling member 55 the electric expansion valve power-off in the situation that.In addition, Compress Spring 39 can also provide pulling force so that axle 51 keeps the same side to contact with moving iron 64 all the time, thread pitch when this is conducive to eliminate reversing motion.But, it will be appreciated by those skilled in the art that therefore Compress Spring 39 can be omitted because needle coupling member 55, needle 14, axle 51, rotor 42 and moving iron 64 itself have certain weight so that above-mentioned power to be provided.

In preferred example, electric expansion valve 1 also comprises supporting element 80, and supporting element 80 can comprise: the 80-1 of first portion as mentioned above; And second portion 80-2 as mentioned above.In the 80-1 of first portion, can be formed with through hole, this through hole can have round-shaped.Thus, the collar 51-4(that the 80-1 of first portion slidably holds axle 51 by its manhole is equivalent to, between the 80-1 of first portion and collar 51-4, sliding bearing is set), thereby guiding the rotatablely moving and axial motion of axle 51, so that the rotatablely moving and more steadily (making axle 51 obtain reliable radial location) of axial motion of axle 51.In second portion 80-2, also can be formed with manhole, this manhole is equivalent to, between second portion 80-2 and the 55-1 of first portion of needle coupling member 55, sliding bearing is set for the 55-1(of first portion that slidably holds needle coupling member 55), thereby rotatablely moving and axial motion of guiding needle coupling member 55, so that the rotatablely moving and more steadily (making needle coupling member 55 obtain reliable radial location) of axial motion of needle coupling member 55.In this way, can guarantee axle 51 and needle coupling member 55 as a whole (being actuator 50) rotatablely move and axial motion more steady.

In preferred example, electromagnetism retaining mechanism 60 is arranged on actuator 50 tops, and the central axis of electromagnetism retaining mechanism 60 can be arranged to roughly overlap with the spin axis of axle 51.

In preferred example, electromagnetism retaining mechanism 60 comprises: the electromagnetic coil 61 that produces magnetic attraction in the time of energising; With respect to electromagnetic coil 61 fixing determine iron 62; And as mentioned above can be with respect to the moving iron 64 of determining iron 62 and moving.

Electromagnetism retaining mechanism 60 is configured for realizing the function (the automatic cut-off protection protective function of electric expansion valve) of closing voluntarily after solenoid valve 1 power-off.That is electromagnetism retaining mechanism 60 is specially electromagnetic coil 61 at electromagnetism retaining mechanism 60() when energising makes to determine iron 62 and moving iron 64 magnetic attracting, thereby makes iron 64 remain on the first axial position (attracted position).At this first axial position, can be held in fixing axial height and force axle 51 itself to carry out axial motion together with needle coupling member 55 and needle 14 by the rotation of axle 51 at moving iron 64, to regulate the valve opening (comprise valve opening is adjusted to standard-sized sheet, middle aperture and full cut-off) of electric expansion valve 1.On the other hand, electromagnetism retaining mechanism 60 can make iron 64 be released into the second axial position (not attracted position) in the time of 60 power-off of electromagnetism retaining mechanism.At this second axial position, needle 14 can be closed valve seat 12-3.Particularly, in the time for example making electromagnetic coil 61 power-off of electric expansion valve 1 and then electromagnetism retaining mechanism 60 due to system accident power-off, the magnetic attracting of determining between iron 62 and moving iron 64 disappears.Like this, if now needle 14 is the second end 14-2 of needle 14 12-3 that lifts off a seat in not closing valve seat 12-3() state, moving iron 64, axle 51, rotor 42, needle coupling member 55 and needle 14 can be as a unit jointly under Action of Gravity Fields and/or be arranged under the effect of spring force of the Compress Spring 39 between supporting element 80 and the stepped part 55-4 of needle coupling member 55 and fall downwards so that needle 14 is closed valve seat 12-3.

In illustrated example, moving iron 64 can comprise upper segment 64-1 and lower section 64-2 referred to above.Upper segment 64-1 can have circular circumference (being that radial cross section is rounded).Lower section 64-2 can have and below will do the non-circular or polygonal periphery that matches in week in the non-circular or polygonal of through hole of the housing described (as according to anti-rotation member of the present utility model) 70 (be that radial cross section is non-circular or polygonal, as according to anti-rotation structure AR of the present utility model).For example, (Fig. 4 A is the sectional view that the matching relationship that moves iron and axle and housing is shown intercepting along the plane A-A in Fig. 1 as shown in Figure 4 A and 4 B shown in FIG., and Fig. 4 B is the stereogram illustrating according to the moving iron of mode of execution of the present utility model), lower section 64-2 can have section circle shape periphery truncate on radially relative bilateral symmetry ground, in other words the roughly straight sidepiece that, lower section 64-2 is can two relative and the sidepiece of two relative circular arcs.Here, be that although as described above iron 64 only locates to arrange anti-rotation structure AR in a part (lower section 64-2), but can conceive, also can on the whole axial length of moving iron 64, anti-rotation structure AR(be set as described below).

In preferred example, in lower section (internal thread part) 64-2 of moving iron 64, be formed with the receiving hole of opening (as according to interior threaded hole of the present utility model) 64-21 downward, receiving hole 64-21 can have round-shaped and can be formed with internal thread in receiving hole 64-21.Receiving hole 64-21 is for holding first end (upper end/male end) 51-1 of axle 51 with thread connecting mode.

According to mode of execution of the present utility model, be provided for the housing 70 coordinating with the lower section 64-2 of moving iron 64.Housing 70 can have through hole 70-1, through hole 70-1 can have week/inner wall surface in the non-circular or polygonal matching with non-circular or polygonal periphery/outer wall surface of the lower section 64-2 of moving iron 64 (be that radial cross section is non-circular or polygonal, as according to anti-rotation structure AR of the present utility model).For example, as shown in Figure 4 A, through hole 70-1 can have in radially truncate the cutting week in circle shape in bilateral symmetry ground relatively.Thus, coordinate by this non-circular or polygonal of the moving lower section 64-2 of iron 64 and the through hole 70-1 of housing 70, moving iron only can carry out axial translation motion and the motion that can not rotate in a circumferential direction.

According to mode of execution of the present utility model, alternatively, stop bit mechanism 57 can be set in actuator 50.Stop bit mechanism 57 can comprise: spring helical guideway 57-1; Slip ring 57-3; And guide finger 57-5.Stop bit mechanism 57 limits the rotating range of axle 53 and then whole actuator 50, make it possible to avoid for example, kill and wear problem because the excessive rotation of actuator 50 causes screw pair (being threaded between the receiving hole 64-21 of the first end 51-1 of axle 51 and the lower section 64-2 of moving iron 64), thus the smooth transmission of guarantee screw pair.

Describe according to the working procedure of the electric expansion valve 1 of mode of execution of the present utility model below with reference to Fig. 8 A, Fig. 8 B, Fig. 8 C and Fig. 8 D.Wherein, Fig. 8 A, Fig. 8 B, Fig. 8 C and Fig. 8 D are a series of figure that illustrate according to the working procedure of the electric expansion valve of mode of execution of the present utility model.

Start to be described in state as shown in Figure 8 A from electric expansion valve 1, this state corresponding to moving iron 64, rotor 42, axle 51, needle coupling member 55 the system accident power-off in the situation that fall downwards together with needle 14 make needle 14 close valve seat 12-3 after residing state.Protect under state at this automatic cut-off protection; thereby needle 14 is closed valve seat 12-3 electric expansion valve 1 in full close position; moving iron 64 for example with determine that iron 62 departs from and moving iron 64 with determine iron 62 in non-attracting state, and the slip ring 57-3 of stop bit mechanism 57 is for example in upper position-arresting position.

Then, in the normal situation of service restoration, first execute electricity to driving mechanism 40, rotor 42 is rotated along first direction (direction as shown in Figure 8 A).The rotation of rotor 42 causes axle 51 also to be rotated along first direction together with needle coupling member 55 and needle 14.Along with the rotation of axle 51, the moving iron 64 that its underpart section 64-2 is threaded with the first end 51-1 of axle 51 is in the case of owing to being forced upwardly translation with anti-rotation cooperation of housing 70 cannot rotating, make moving iron return to as shown in Figure 8 B and state that determine iron 62 and contact.Under returning to form as shown in Figure 8 B, thereby needle 14 is still closed valve seat 12-3 electric expansion valve 1 still in full close position, moving iron 64 with determine that iron 62 contacts and now can execute electricity so that move iron 64 and determine iron 62 in magnetic attracting state to electromagnetism retaining mechanism 60, and the slip ring 57-3 of stop bit mechanism 57 becomes in lower position-arresting position.

Then, from the state shown in Fig. 8 B, in the time that needs are opened electric expansion valve 1, the electricity of executing of driving mechanism 40 is controlled, made rotor 42 along second direction (direction as shown in Figure 8 C) rotation contrary with first direction.The rotation of rotor 42 causes axle 51 also to be rotated along second direction together with needle coupling member 55 and needle 14.Along with the rotation of axle 51, axle that its first end 51-1 is threaded with the lower section 64-2 of moving iron 64 51 itself moves up when being forced in rotation together with needle coupling member 55 and needle 14 vertically, can open thus electric expansion valve 1.Like this, electric expansion valve 1 can be in state as shown in Figure 8 C, under the state of the normal work of this electric expansion valve, thereby needle 14 is lifted off a seat, 12-3 electric expansion valve 1 is in fully open position, moving iron 64 with determine iron 62 and remain in magnetic attracting state, and the slip ring 57-3 of stop bit mechanism 57 becomes again in upper position-arresting position.In this respect, can only suitably increase the valve opening of electric expansion valve 1, even if also valve opening is between the middle aperture between standard-sized sheet and full cut-off (now, the slip ring 57-3 of stop bit mechanism 57 is correspondingly in the neutral position between upper position-arresting position and lower position-arresting position).

Then,, in the time of the 1 unexpected accident power-off of electric expansion valve under the state shown in Fig. 8 C, due to electromagnetic coil 61 power-off of electromagnetism retaining mechanism 60, determine iron 62 and no longer attract moving iron 64.Thus, moving iron 64, axle 51, rotor 42, needle coupling member 55 and needle 14 as a unit jointly under Action of Gravity Field and/or be arranged under the effect of spring force of the Compress Spring 39 between supporting element 80 and the stepped part 55-4 of needle coupling member 55 and fall downwards so that needle 14 is closed valve seat 12-3, as shown in Fig. 8 D (state shown in Fig. 8 D is in fact corresponding to the state shown in Fig. 8 A).Now, by the double action of Compress Spring 38 and Compress Spring 39, needle 14 can engage with valve seat 12-3 reliably, protects thereby realize reliably without the automatic cut-off protection of any external energy.

In the working procedure of describing above with reference to Fig. 8 A to Fig. 8 D, first to driving mechanism 40 execute electricity make moving iron 64 upwards translation until moving iron 64 contacts with determining iron 62, then just execute electricity to electromagnetism retaining mechanism 60 and make to determine iron 62 and moving iron 64 magnetic attracting.But, also can upwards move to moving iron 64 at moving iron 64 and execute electricity to electromagnetism retaining mechanism 60 with determining iron 62 before contacting, for example side by side execute electricity to driving mechanism 40 and electromagnetism retaining mechanism 60.Like this, can be for example in the time that moving iron 64 upwards moves to special position by means of the rotation of axle 51 by determine the magnetic attraction of iron 62 and upwards attracting moving iron 64, and axle 51 continues to rotate return to away from moving iron 64 and make needle 14 close the position of valve seat 12-3.In this way, can impel moving iron 64 and determine the magnetic attracting state of iron 62 in being in contact with one another.

According to mode of execution of the present utility model, at least can provide following beneficial effect.

(1) according to mode of execution of the present utility model, thereby by Design of Mechanical Structure, the feature integration of closing voluntarily after solenoid valve power-off is realized in electric expansion valve dexterously to the automatic cut-off protection protective function of electric expansion valve.Especially; with the scheme that adopts the mode of independent solenoid valve of directly connecting to realize power-off protection function (in this scheme; consider pressure drop; thereby the passage section of independent solenoid valve conventionally large cost is very high) compare; can realize the reliability of compact structure and Geng Gao more; can make terminal equipment business save the on-the-spot soldering processes of twice, and can reduce costs widely.In addition, thereby realize to power in the finite time after power-off compared with the scheme of valve closing with increase the super capacitor of realizing energy storage in electronic expansion valve controls plate, can avoid valve to support the use with specific controller, super capacitor cost is very high, controller to working environment than more sensitive relevant issues.In addition, and reserve battery is installed in electronic expansion valve controls plate can continue to carry out compared with the scheme of valve closing after power-off, can be avoided regularly replacing the relevant issues of battery and not environmental protection (lead-acid battery has harmful effect to environment).

(2), according to mode of execution of the present utility model, owing to being provided with stop bit mechanism, therefore can suitably limit the rotation of axle.Thus, for example, in the standard-sized sheet and full close position of valve, can avoid killing and wear problem because of rotor and the axle screw pair that excessively rotation causes, thereby ensure the smooth transmission of screw pair.

(3) according to mode of execution of the present utility model, owing to anti-rotation structure AR being set between anti-rotation member (housing) and moving iron and between moving iron and axle, screw connection structure being set, therefore on the one hand accident power-off after, moving iron departs from the in the situation that of determine iron iron can be returned to and the state of determining ferromagnetism adhesive reliably and reposefully, and also can guarantee that on the other hand axle carries out axial motion to realize reliably and threshold switch process stably together with needle.Particularly, according to mode of execution of the present utility model, owing between moving iron and axle, screw connection structure being set, compared with the scheme of screw connection structure is set between axle and needle coupling member, can make screw connection structure further from for realizing the needle end (lower end) that closes valve, thereby the risk of rocking appears in needle coupling member and then the needle that can reduce may be caused by the operation of screw connection structure, can realize thus more reliable and threshold switch process stably.

(4) according to mode of execution of the present utility model, owing to anti-rotation structure AR being set between anti-rotation member (housing) and moving iron and between moving iron and axle, screw connection structure being set, with between moving iron and axle, compare with the scheme that bearing limit position part etc. is connected by bearing, can avoid adopting the component such as bearing and bearing limit position part and cause structure complicated, and can exempt because moving iron is likely followed the rotation of axle and rotated with respect to determining iron the situation that causes determining to occur between iron and moving iron improper wearing and tearing.

Especially, according to mode of execution of the present utility model, realize the automatic cut-off protection protective function of electric expansion valve in more reliable and effective mode.

The utility model can be allowed some variants and modifications.

For example, (Fig. 5 A is the sectional view illustrating according to the anti-rotation structure of the first modified example of mode of execution of the present utility model as shown in Figure 5 A and 5B, and Fig. 5 B is the stereogram illustrating according to the moving iron with anti-rotation structure of the first modified example of mode of execution of the present utility model), moving iron 64A can be formed as having the groove 64A-5 extending along whole axial direction in periphery, for example, have four groove 64A-5 along circumferential direction equi-spaced apart with 90 degree.In addition, the place of interior week of the through hole 70A-1 that housing 70A can be formed as at housing 70A has the convex ridge 70A-5 matching with groove 64A-5.In this way, also can form reliably anti-rotation structure AR.

Again for example, (Fig. 6 A is the sectional view illustrating according to the anti-rotation structure of the second modified example of mode of execution of the present utility model as shown in Figure 6 A and 6B, and Fig. 6 B illustrates according to the moving iron with anti-rotation structure of the second modified example of mode of execution of the present utility model and the stereogram of sleeve), according to the structure of the moving iron 64B of the second modified example can with according to the structure identical (thering is identical exterior contour) of the moving iron 64A of the first modified example.In addition, in the second modified example, sleeve 75B is set between moving iron 64B and housing 70B as intermediate member (as according to anti-rotation member of the present utility model).Sleeve 75B can for example be inserted into by interference fit in the through hole of housing 70B regularly, and the while has at the place of interior week of the through hole 75B-1 of sleeve 75B the convex ridge 75B-5 matching with groove 64B-5.In this way, also can form reliably anti-rotation structure AR.

Again for example, as shown in Fig. 7 A and 7B, (Fig. 7 A is the sectional view illustrating according to the anti-rotation structure of the 3rd modified example of mode of execution of the present utility model, and Fig. 7 B illustrates according to the moving iron with anti-rotation structure of the 3rd modified example of mode of execution of the present utility model and the stereogram of sleeve), there is cylindrical circular upper segment and be the lower section of octahedra shape according to the moving iron 64C of the 3rd modified example.In addition, in the 3rd modified example, sleeve 75C is set between moving iron 64C and housing 70C as intermediate member (as according to anti-rotation member of the present utility model).Sleeve 75C can be inserted into regularly by interference fit or for example, be connected in regularly in the through hole of housing 70C with other appropriate ways (weld, be threaded etc.), and the through hole 75C-1 of sleeve 75C is general square shape simultaneously.The lower section that is octahedra shape of moving iron 64C is suitable for being inserted into matchingly in the through hole 75C-1 of sleeve 75C, makes moving iron 64C can not rotate in a circumferential direction and be merely able to carry out axial translation.In this way, also can form reliably anti-rotation structure AR.And, in this way, because four bights place at square through hole 75C-1 is formed with gap so that so-called " vapour lock " situation is avoided in circulation of air, be therefore conducive to the smooth translation of moving iron with respect to housing or sleeve etc.

In addition, although as described above be, axle 51 forms outside thread and moving iron 64 forms internal thread, but can conceive, axle 51 forms internal thread and moving iron 64 forms outside thread (for example on axle top, interior threaded hole is set and outstanding bolt part is set in moving iron bottom) or other suitable thread connecting mode.

Although needle 14 as described above is attached to axle 51 via needle coupling member 55, but can conceive, needle 14 also can directly be attached to axle 51.

Although as described above be, at housing 70,70A, 70B, 70C or between as sleeve 75B, the 75C of intermediate member and moving iron 64,64A, 64B, 64C, anti-rotation structure AR is set, but can conceive, also can between moving iron 64 and other member (as according to anti-rotation member of the present utility model), (for example, in the moving periphery of upper segment 64-1 of iron 64 and between the interior week of the cylindrical shell of electromagnetic coil 61 inner sides of electromagnetism retaining mechanism 60) anti-rotation structure AR be set.

In present specification, directional terminology " top ", " end ", " on ", the use of D score, " top " and " below " etc. is only for the object of being convenient to describe, and should not to be considered as be restrictive.

Although the utility model is described with reference to illustrative embodiments, but be to be understood that, the utility model is not limited to concrete example/mode of execution of describing in detail and illustrate in literary composition, in the situation that not departing from claims limited range, those skilled in the art can make various changes to illustrative embodiments.

Claims (23)

1. an electric expansion valve (1), comprising:

Valve assembly (10), described valve assembly (10) comprises movable valve member (14) and for the flow of the fluid that flows through described electric expansion valve (1) is regulated;

Actuator (50), described actuator (50) comprises axle (51) and for driving described movable valve member (14) to carry out axial motion;

Driving mechanism (40), described driving mechanism (40) is used to described actuator (50) that power is provided; And

Electromagnetism retaining mechanism (60), described electromagnetism retaining mechanism (60) comprises moving iron (64, 64A, 64B, 64C) and be suitable for by electromagnetic attraction force retaining and discharge described actuator (50), in the time that described electromagnetism retaining mechanism (60) keeps described actuator (50) in energising situation, described axle (51) can drive described movable valve member (14) to carry out axial motion to regulate the valve opening of described electric expansion valve (1), in the time that described electromagnetism retaining mechanism (60) discharges described actuator (50) under powering-off state, described movable valve member (14) moves to the position that described electric expansion valve (1) is closed,

It is characterized in that described axle (51) and described moving iron (64,64A, 64B, 64C) be threaded, make the described axle (51) can be with respect to described moving iron (64,64A, 64B, 64C) rotation, and, described electric expansion valve (1) is provided with anti-rotation structure (AR), makes described moving iron (64,64A, 64B, 64C) be merely able to carry out translational motion and can not be rotated along the axial direction of described electric expansion valve (1).

2. electric expansion valve according to claim 1 (1), wherein

Described movable valve member (14) is needle (14),

Described valve assembly (10) also comprises valve seat (12-3),

And described needle (14) is suitable for described valve seat (12-3) thereby engages described electric expansion valve (1) is closed.

3. electric expansion valve according to claim 2 (1), wherein, described actuator (50) also comprises needle coupling member (55), described needle (14) is attached to described axle (51) via described needle coupling member (55).

4. electric expansion valve according to claim 3 (1), wherein, described needle coupling member (55) comprises first portion (55-1) and second portion (55-2), described first portion (55-1) is fixedly connected to described axle (51), described needle (14) with axially slidably mode be attached to described second portion (55-2).

5. electric expansion valve according to claim 4 (1) wherein, arranges the first Compress Spring (38) that applies spring force to described needle (14) between described needle coupling member (55) and described needle (14).

6. electric expansion valve according to claim 5 (1), wherein, second portion (55-2) at described needle coupling member (55) locates to arrange receiving bore (55-21), one end (14-1) of described the first Compress Spring (38) and described needle (14) is arranged in described receiving bore (55-21), and described the first Compress Spring (38) is positioned between described needle coupling member (55) and described one end (14-1) of described needle (14).

7. electric expansion valve according to claim 6 (1), wherein

Inner wall surface place in the lower end of described receiving bore (55-21) arranges circular groove,

Described electric expansion valve (1) also comprises back-up ring (36), described back-up ring (36) thus be arranged in described circular groove can with first step portion (14-3) butt of periphery that is formed on described needle (14), limit thus described needle (14) and deviate from from described needle coupling member (55).

8. electric expansion valve according to claim 7 (1), wherein, described back-up ring (36) is embodied as with removably and is arranged in the special-shaped circlip in described circular groove.

9. electric expansion valve according to claim 8 (1), wherein, described back-up ring (36) comprises elastic body portion and a pair of grasping part of general toroidal, extend from the associated end of described elastic body portion respectively each described grasping part.

10. electric expansion valve according to claim 1 (1), wherein, described driving mechanism (40) comprises rotor (42), and described rotor (42) is embodied as and forms with described axle (51) or cylindric magnet ring that be permanently connected, an end opening.

11. electric expansion valves according to claim 1 (1) wherein, are provided for the stop bit mechanism (57) of the rotating range that limits described axle (51) in described actuator (50).

12. electric expansion valves according to claim 11 (1), wherein, described stop bit mechanism (57) comprising: spring helical guideway (57-1); Slip ring (57-3); And guide finger (57-5).

13. electric expansion valves according to claim 1 (1), wherein

Described axle (51) comprises male end (51-1), and described moving iron (64,64A, 64B, 64C) comprises interior threaded hole (64-21), and described axle (51) is threaded described in can realizing with described moving iron (64,64A, 64B, 64C) thus,

Or described axle (51) comprises interior threaded hole, and described moving iron (64,64A, 64B, 64C) comprises outstanding bolt part, and described axle (51) is threaded described in can realizing with described moving iron (64,64A, 64B, 64C) thus.

14. electric expansion valves according to claim 1 (1), wherein, described electromagnetism retaining mechanism (60) also comprises: the electromagnetic coil (61) that produces magnetic attraction in the time of energising; And with respect to described electromagnetic coil (61) fixing, be suitable for described moving iron (64,64A, 64B, 64C) magnetic attracting determine iron (62).

15. according to the electric expansion valve described in any one in claim 1 to 14 (1), wherein, described moving iron (64,64A, 64B, 64C) at least a portion in axial direction, be provided for the non-circular or polygonal periphery of at least a portion that forms described anti-rotation structure (AR).

16. electric expansion valves according to claim 15 (1), wherein, described electric expansion valve (1) comprises anti-rotation member, described anti-rotation member has through hole, described through hole is provided with and described moving iron (64,64A, 64B, 64C) the non-circular or polygonal of non-circular or at least a portion that polygonal periphery matches, be used to form described anti-rotation structure (AR) in week.

17. electric expansion valves according to claim 16 (1), wherein, described anti-rotation member be form described electric expansion valve (1) outward appearance at least a portion housing (70,70A) or be connected in regularly described housing (70B, sleeve (75B, 75C) in through hole 70C).

18. electric expansion valves according to claim 17 (1), wherein

Described moving iron (64) comprises First section (64-1) and second section (64-2), and described First section (64-1) has circular circumference, and described second section (64-2) has the circle of cutting shape periphery,

And the through hole (70-1) of described housing (70) has cutting week in circle shape of matching.

19. electric expansion valves according to claim 17 (1), wherein

Described moving iron (64A) is formed as having the groove (64A-5) extending along whole axial direction in periphery,

And described housing (70A) is formed as having at the place of interior week of the through hole (70A-1) of described housing (70A) convex ridge (70A-5) matching with described groove (64A-5).

20. electric expansion valves according to claim 17 (1), wherein

Described moving iron (64B) is formed as having the groove (64B-5) extending along whole axial direction in periphery,

And, there is at the place of interior week of the through hole (75B-1) of described sleeve (75B) convex ridge (75B-5) matching with described groove (64B-5).

21. electric expansion valves according to claim 17 (1), wherein

Described moving iron (64C) has cylindrical circular First section and is second section of octahedra shape,

And the through hole (75C-1) of described sleeve (75C) is general square shape and is suitable for holding second section of described moving iron (64C).

22. according to the electric expansion valve described in any one in claim 4 to 9 (1), wherein, described electric expansion valve (1) also comprises supporting element (80), described supporting element (80) be suitable for the collar (51-4) of the office, bottom that is arranged on described axle (51) of described axle (51) and with first portion (55-1) slip joint of described needle coupling member (55).

23. electric expansion valves according to claim 22 (1), wherein, be formed with second step portion (55-4) in the periphery of described needle coupling member (55), between described second step portion (55-4) and described supporting element (80), the second Compress Spring (39) is set, described the second Compress Spring (39) is suitable for providing spring force for described needle coupling member (55).

Images