KR101165317B1 - Electrically operated valve - Google Patents

Abstract

In order to reduce the cost of the valve body part, a press-formed product is used for the valve body part, and an electric valve capable of securing high coaxiality to rotors, valve bodies, cans, valve shafts, guide members, etc., which are rotation system components, is provided. to provide. A valve body (70) having a valve shaft (24) having a valve body (24a), a valve seat (72) in which the valve body (24a) is contacted and separated, a can (40) bonded to the valve body (70), The rotor 30 disposed on the inner circumference of the can 40, the stator 50 disposed on the outer circumference of the can 40 to drive the rotor 30 in rotation, and the valve body 70. It is held and fixed and disposed between the guide member 80 having a cylindrical portion for guiding the valve shaft 24, and between the rotor 30 and the valve body 24a, thereby rotating the rotor 30. And a screw feed mechanism 15 for contacting and separating the valve body 24a from the valve seat. The valve body 70 includes a valve seat member 72 produced by cutting and press working. And a cylindrical valve chamber forming member 74 formed with a receiving flange-shaped portion 74a by press working, The outer circumferential side is mounted on the can flange flange portion 74a of the valve chamber forming member 74 to be welded and joined, and is constituted by a connection holding member 76 which holds and holds the guide member 80 on the inner circumferential side.

Electric valve, valve body, cost reduction, tachometer, coaxial diagram

Description

Electric valve {ELECTRICALLY OPERATED VALVE}

1 is a longitudinal cross-sectional view showing an embodiment of the electric valve according to the present invention,

FIG. 2 is a partially enlarged view of the valve body shown in FIG. 1,

3 is a longitudinal sectional view showing another embodiment of the electric valve according to the present invention;

4 is a view showing a fixed stopper a and a movable stopper b constituting the stopper mechanism for limiting rotation of the electric valve shown in FIG.

5 is a view provided for explaining the operation of the stopper mechanism for limiting rotation of the electric valve shown in FIG. 4;

6 is a longitudinal sectional view showing an example of a conventional electric valve;

FIG. 7 is a partially enlarged view of the valve body illustrated in FIG. 6. FIG.

<Explanation of symbols for the main parts of the drawings>

10: electric valve 15, 16: screw feed mechanism

24: valve shaft 24a: valve body

25, 28: fixing screw part 27: fixing stopper

30: rotor 29, 31: movable screw portion

32: valve shaft holder 34: buffer coil spring

37: movable stopper 40: can

41, 42: conduit 50: stator

60: valve shaft 61: valve body

68: fixed stopper 69: movable stopper

70: valve body 71: valve chamber

72 valve seat member 72a valve valve

74: valve chamber forming member 74a: can holder flange shape

74, 76 ': connection holding member 76a: cylindrical portion

76b: upper flange portion 80, 80 ': guide member

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electric valves assembled and used in air conditioners, refrigerators, and the like. In particular, in order to reduce the cost of the valve body portion, a press-formed product is used for the valve body portion, and a rotation system component member (rotor, valve) is used. The main body, cans, valve shafts, guide members, etc.) relates to an electric valve that can ensure a high coaxial degree.

The conventional example of this kind of electric valve is shown in FIG. The illustrated electric valve 9 includes a cylindrical valve chamber valve seat forming member 20A having a stage forming the valve chamber 21, the valve seat 22 (valve inlet 22a), and a circular annular flange-shaped canister member. A valve body 20 having 23 and the like is provided. The valve body 20 adjusts the flow rate of the fluid such as the refrigerant by the valve body 24a (the valve shaft 24) which is in contact with and separated from the valve seat 22, and is produced by cutting. The flanged receiving member 23 produced by cutting or pressing is fixed to the upper stepped portion 20a of the valve seat forming member 20A, and the flanged receiving member 23 (formed on the stepped portion 23a formed on the flanged receiving member 23). The lower end part 40b of the cylindrical can 40 which has the bottom part of the downward opening is joined, and it is sealed and joined by welding (welding part K) (refer FIG. 7).

On one side of the valve chamber 21 of the valve body 20, the first conduit 41 for the refrigerant inlet and the second conduit 42 for the refrigerant inlet and below the valve chamber 21. ) Are respectively fixed by soldering or the like.

The rotor 30 is disposed and placed at an inner circumference of the can 40 at a predetermined interval, and the outer circumference of the can 40 is yoke 51 and bobbin (to rotate the drive of the rotor 30). 52), a stator 50 composed of stator coils 53, 53, resin mold cover 56, and the like is disposed, and the rotor 30 and the stator 50 comprise a stepping motor.

A drive mechanism is provided between the rotor 30 and the valve shaft 24 for contacting and separating the valve body 24a from the valve seat 22 by using the rotation of the rotor 30. The drive mechanism is a cylindrical guide member 26 in which the lower end portion 26a is press-fitted and fixed to the fitting hole 28 provided in the valve body 20, and the valve shaft 24 is slidably fitted inwardly. On the inner circumference of the cylindrical valve shaft holder 32 (with a fixing screw portion 25 formed on the outer circumference of the bottom) and a bottom of the lower opening disposed on the outer circumference of the valve shaft 24 and the guide member 26. The screw feed mechanism 15 which consists of the movable screw part 31 which was formed and was able to be screwed to the said fixed screw part 25 is comprised.

More specifically, the upper portion of the valve shaft 24 is loosely fitted to the bottom of the valve shaft holder 32, the nut member 33 is fixed to the upper end thereof, and the screw feed mechanism 15 If the valve shaft holder 32 can be raised while rotating, the valve shaft 24 is allowed to rise accordingly (when the valve body 24a is seated and pressed against the valve seat 22, no idling is performed). .

In the electric valve 9 having such a configuration, the valve body 24a is energized in one direction to the stator coils 53 and 53 in a state in which the valve body 24a is separated (lifted) from the valve seat 22 (the valve port 22a is open). When excited, the rotor 30 and the valve shaft holder 32 rotate in one direction with respect to the guide member 26 fixed to the valve body 20, and the valve shaft holder is driven by the screw feed mechanism 15. 32 lowers, the valve body 24a is seated and pressed against the valve seat 22, and the valve port 22a is closed.

When the valve body 24a is seated on the valve seat 22, the movable stopper 37 provided in the lower end of the valve shaft holder 32 has not yet contacted the fixed stopper 27 fixed to the valve main body 20 side. Instead, the rotor 30 and the valve shaft holder 32 are lowered while the valve body 24a closes the valve mechanism 22a. At this time, since the valve shaft holder 32 is lowered with respect to the valve shaft 24, the buffer coil spring 34 for cushioning disposed between the valve shaft holder 32 and the valve shaft 24 is compressed. As a result, the valve body 24a of the valve shaft 24 can be pressed firmly against the valve seat 22, so that it can be completely closed (all closed).

Thereafter, when the rotor 30 is further rotated and the valve shaft holder 32 is lowered, the movable stopper 37 abuts on the fixed stopper 27, and the valve shaft holder is maintained even when the energization to the stator coils 53 and 53 continues. The rotation and the lowering of the 32 can be forcibly stopped.

From this stop state, when energizing the stator coils 53 and 53 in different directions, the rotor 30 and the valve shaft holder 32 are rotated in the opposite directions to the guide member 26, and the screw By the transfer mechanism 15, the valve shaft holder 32 is raised this time, the valve body 24a is separated from the valve seat 22, the valve opening 22a is opened, and it flows in into the valve chamber 21 from the 1st conduit 41. The refrigerant flows through the valve port 22a and flows out into the second conduit 42, and the passage flow rate of the refrigerant is quantitatively adjusted in accordance with the lift amount of the valve body 24a (see Patent Document 1 below for details).

[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-50415

As mentioned above, in the conventional electric valve 9, cost reduction of the part of the valve main body 20 is calculated | required. That is, since the main part (20A of valve chamber valve seat forming members) is manufactured as a single part by cutting, the conventional valve main body 20 part has the disadvantage that component cost becomes high. Therefore, the valve body part is divided into several parts, and the valve seat part, which is difficult to manufacture by press working, has a shape and size that can be easily manufactured by cutting, and the other part is divided into several and the production cost is relatively high. It is devised to assemble the wrapper after it is produced by press working. However, when using a press-worked product as a part, their work assembling precision becomes a problem.

That is, to ensure a high coaxiality in the rotation system components (rotor 30, valve body 20, can 40, valve shaft 24, guide member 26, valve shaft holder 32, etc.) That is, it is necessary to prevent deviations from their rotational axis or the center axis (matching each axis to a common axis O), but if the precision of the machining assembly of the rotation system component is low, The can 40 and the rotor 30 rub against each other, or the frictional resistance between the sliding contact portions of the valve shaft 24 and the guide member 26 increases, and thus the operation performance and the durability performance decrease. Therefore, when assembling the valve body and even the entire electric valve from several parts, it becomes important how to secure a high coaxiality to the rotational component.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to use a press-worked product for the valve body portion in order to reduce the cost of the valve body portion, and at the same time, a rotor, a valve body, a can, and a valve which is a rotation system component member. It is an object of the present invention to provide an electric valve capable of securing a high coaxiality in a shaft, a guide member, or the like.

In order to achieve the above object, an electric valve according to the present invention basically includes a valve body having a valve body, a valve body having a valve seat in which the valve body contacts and is separated, and a can joined to the valve body; A guide member having a rotor disposed on an inner circumference of the can, a stator disposed on an outer circumference of the can for rotationally driving the rotor, a guide member held and fixed to the valve body to guide the valve shaft; A screw feed mechanism is disposed between and disposed between the rotor and the valve body to contact and separate the valve body from the valve seat using the rotation of the rotor.

The valve body includes a valve seat member formed by cutting, a cylindrical valve chamber forming member manufactured by press working, and having a receiving flange-shaped portion, and a valve chamber formed by press working so that the outer circumferential side of the valve chamber is formed. And a connection holding member mounted on the can flange flange portion of the forming member and welded to hold the guide member on the inner circumferential side.

The connection holding member is, in one preferred embodiment, a cylindrical portion fitted to an inner circumference of the valve chamber forming member, an upper flange portion mounted on the can flange flange portion of the valve chamber forming member and welded to the valve chamber forming member, and It becomes cylindrical shape which has a bottom part with a flange shape part which consists of a hole formation bottom part for holding and holding a guide member.

Moreover, the said connection holding member becomes a circular ring plate shape in another preferable form.

In another preferable form, the outer diameter side of the connection holding member or the upper flange-shaped portion is smaller than the outer diameter of the can flange flange-shaped portion of the valve chamber forming member, and the can flange flange portion and the connection holding member or upper flange shape thereof are smaller. The lower end of the can is joined to the stepped portion formed by the portion, and is hermetically sealed by welding.

In another preferred embodiment, the guide member is caulked or welded to the inner circumference of the connection holding member, or the guide member and the connection holding member are integrally formed by press working.

In another preferred embodiment, one end of the refrigerant inlet conduit can be inserted into the valve chamber through the hole formed in the valve chamber forming member, and the one end can be brought into contact with the valve seat member.

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below with reference to the drawings.

1 is a longitudinal sectional view showing one embodiment of a motor operated valve according to the present invention. The electric valve 10 of this embodiment is equipped with the valve main body 70 which has the valve chamber 71 and the valve seat 72 (valve port 72a) similarly to the electric valve 9 shown in FIG. 6 mentioned above. Doing. The valve body 70 includes a valve seat member 72 having a valve port 72a made by cutting, a cylindrical valve chamber forming member 74 formed with a can flange flange portion 74a made by press working, and Similarly, the valve body 24a (valve shaft) is formed of a cylindrical connection retaining member 76 having a flange-like portion 76b formed by press working (described in detail later) and contacting and separating from the valve seat 72. 24), the passage flow rate of the fluid such as the refrigerant is adjusted. The lower end portion 40b of the cylindrical can 40 having the bottom of the lower opening is joined to the can flange flange portion 74a of the valve chamber forming member 74 by sealing (welding portion K). 2).

On one side of the valve chamber 71 of the valve body 70, the first conduit 41 for the refrigerant inlet and the second conduit 42 for the refrigerant inlet and below the valve chamber 71. ) Is fixed to each other by soldering or the like. In this case, one end of the first conduit 41 is inserted into the valve chamber 71 through the hole 74c formed in the valve chamber forming member 74, and the step is formed in the valve seat member 72. It can come in contact with 72b.

The rotor 30 is disposed and placed at an inner circumference of the can 40 at a predetermined interval, and the outer circumference of the can 40 is yoke 51 and bobbin (to rotate the drive of the rotor 30). 52), a stator 50 composed of stator coils 53, 53, resin mold cover 56, and the like is disposed, and the rotor 30 and the stator 50 comprise a stepping motor.

And between the rotor 30 and the valve shaft 24, the drive mechanism which contacts and isolate | separates the said valve body 24a to the said valve seat 72 using the rotation of the rotor 30 is provided. The drive mechanism is a cylindrical guide member 80 having a stage that is fixedly fixed to the connection holding member 76 of the valve body 70 and has a step fitted inside so that the valve shaft 24 slides so as to be movable. Is formed on the inner circumference of the cylindrical valve shaft holder 32 (with a fixing screw portion 25 formed on the outer circumference of the bottom) and a bottom of the lower opening disposed on the outer circumference of the valve shaft 24 and the guide member 80. The screw feed mechanism 15 which consists of the movable screw part 31 which became screwable to the said fixed screw part 25 is comprised.

More specifically, the upper portion of the valve shaft 24 can be loosely fitted to the bottom of the valve shaft holder 32, and the nut member 33 is fixed to the upper end thereof, so that the screw feed mechanism 15 As a result, if the valve shaft holder 32 can be raised while rotating, the valve shaft 24 can be raised accordingly (when the valve body 24a is seated and press-contacted to the valve seat 72, idling is not performed. Do).

In addition, the valve shaft 24 is always pressed downward by a coil spring 34 for cushioning, which is reduced in size between the bottom of the valve shaft holder 32 and the intermediate step portion of the valve shaft 24. On the side surface of the guide member 80, a pressure equalizing hole 82a is formed to achieve uniform pressure in the valve chamber 71 and the can 40.

On the bottom of the valve shaft holder 32, a return spring 35 made of a coil spring is provided. The return spring 35 comes into contact with the inner surface of the can 40 when the screwing of the fixed screw 25 of the guide member 80 and the movable screw 31 of the valve shaft holder 32 is removed, and the fixed screw portion ( 25) and actuates to return the screw engagement of the movable screw portion (31).

The valve shaft holder 32 and the rotor 30 are coupled via a support ring 36, and the support ring 36 is a brass metal ring inserted in the molding of the rotor 30 in this embodiment. Consists of. The upper projection of the valve shaft holder 32 is cocked and fixed to the support ring 36, whereby the rotor 30, the support ring 36 and the valve shaft holder 32 are integrally connected.

A fixed stopper 27 constituting one of the rotation limiting stopper mechanisms is fixed to the lower large diameter portion 80a of the guide member 80, and a movable stopper constituting the other side of the stopper mechanism is fixed to the valve shaft holder 32. 37) is fixed.

Here, in the present embodiment, the valve seat member 72 produced by cutting, the valve chamber forming member 74 produced by press working, which constitutes the valve body 70, is produced by press working as well. The connection holding member 76 is made of stainless steel, and the lower end of the cylindrical portion of the valve chamber forming member 74 is fixed to the valve seat member 72 by press fitting, welding, or the like. As a result, high coaxiality is obtained between the valve seat member 72 and the valve chamber forming member 74.

In addition, as shown in an enlarged view in FIG. 2, the connection holding member 76 includes a cylindrical portion 76a fitted to an inner circumference of the valve chamber forming member 74 and a can flange of the valve chamber forming member 74. It is connected to the guide member 80 by holding and caulking the upper flange-shaped portion 76b mounted on the shape portion 74a and welded to the lower end portion (thin cylindrical portion) 82 of the guide member 80, thereby holding and fixing it. The bottom portion 76c has a hole 76d formed therein. On the lower surface of the upper flange-shaped portion 76b of the connection holding member 76 (or the upper surface of the valve chamber forming member 74), projections 76e are formed in some places for the convenience of welding welding. In joining the connection holding member 76 to the valve chamber forming member 74, the canister flange is fitted with the cylindrical portion 76a of the connection holding member 76 to the inner circumference of the valve chamber forming member 74. The upper flange-like portion 76b of the connection holding member 76 is burned and pushed (the protrusion 76e is pierced) on the shaped portion 74a, and projection welding is performed in a pressurized state. As a result, the valve chamber forming member 74 and the connection holding member 76 are joined with a high coaxiality, and the coaxiality between them and the guide member 80 also increases.

In the present embodiment, the outer diameter of the upper flange portion 76b of the connection holding member 76 is smaller than the outer diameter of the can flange flange portion 74a of the valve chamber forming member 74. The lower end part 40b of the can 40 is joined to the step part 73 formed of 74a and the upper flange-shaped part 76b, and is sealed-sealed by welding (welding part K). Thereby, not only the center axis of the can 40 and the center axis of the valve seat member 72, the valve chamber forming member 74, and the connection holding member 76 constituting the valve body 70, but also the guide member ( Almost no deviation occurs between the center axes of the 80, and also between the valve shaft 24, the valve shaft holder 32, and further the rotor 30, which are fitted inwardly to the guide member 80, Almost no deviation occurs, and high coaxiality (common axis O) is obtained for all of the rotation system components.

In the electric valve 10 having such a configuration, the stator coils 53 and 53 are energized in one direction in a state where the valve body 24a is separated (lifted) from the valve seat 72 (the valve port 72a is open). When excited, the rotor 30 and the valve shaft holder 32 rotate in one direction with respect to the guide member 80 held and fixed to the connection holding member 76 of the valve body 70, and the screw feed mechanism ( By 15), the valve shaft holder 32 is lowered, the valve body 24a is seated and pressure-contacted to the valve seat 72, and the valve port 72a is closed.

When the valve body 24a is seated on the valve seat 72, the movable stopper 37 set at the lower end of the valve shaft holder 32 is not yet in contact with the fixed stopper 27 fixed to the valve body 70 side. Instead, the rotor 30 and the valve shaft holder 32 are lowered further while the valve body 24a closes the valve mechanism 72a. At this time, since the valve shaft holder 32 is lowered with respect to the valve shaft 24, the buffer coil spring 34 disposed between the valve shaft holder 32 and the valve shaft 24 is compressed and Therefore, the valve body 24a of the valve shaft 24 can be pressed firmly against the valve seat 72 and can be completely closed (all closed).

Thereafter, when the rotor 30 is further rotated and the valve shaft holder 32 is lowered, the movable stopper 37 abuts on the fixed stopper 27, and the valve shaft holder is maintained even when the energization to the stator coils 53 and 53 continues. The rotation and the lowering of the 32 can be forcibly stopped.

From this stop state, when energizing the stator coils 53 and 53 in different directions, the rotor 30 and the valve shaft holder 32 are rotated in the opposite directions to the guide member 80, and the screw By the transfer mechanism 15, the valve shaft holder 32 is raised this time, the valve body 24a is separated from the valve seat 72, the valve opening 72a is opened, and it flows in into the valve chamber 71 from the 1st conduit 41. The refrigerant flows through the valve port 72a and flows out to the second conduit 42, and the passage flow rate of the refrigerant is quantitatively adjusted according to the lift amount of the valve body 24a.

As described above, the electric valve 10 of the present embodiment has three parts of the valve body 70, namely the valve seat member 72, the valve chamber forming member 74 and the connection holding member 76. The valve seat member 72 is divided into shapes and sizes that can be easily manufactured by cutting, and the other parts (the valve chamber forming member 74 and the connection holding member 76) are easily press-processed and high. Since the parts are manufactured by dividing them into parts having a shape (cylindrical with flange shape) that can ensure processing assembly precision, and then assembling them, the cost reduction of the valve body part is intended, and the rotation system constituting member (valve body 70) is intended. A predetermined coaxiality is obtained for the can 40, the rotor 30, the valve shaft 24, the guide member 80, and the like.

In particular, the valve chamber forming member 74 has a cylindrical shape with a flange-shaped portion, and the connection retaining member 76 has a cylindrical portion 76a fitted between the inner circumference of the valve chamber forming member 74 and the valve chamber forming member 74. It is made into the cylinder shape with the flange shape part which consists of the upper flange shape part 76b mounted and welded on the canned flange shape part 74a, and the bottom part 76c in which the hole 76d which hold | maintains and maintains the guide member 80 is formed, and valve chamber formation By joining the lower end portion 40b of the can 40 to the step portion 73 formed by the member 74 and the connection holding member 76, and joining by welding, they are substantially displaced from the rotational axis and the center axis of all the rotation system constituting members. Can be prevented from occurring and high coaxiality can be secured to them, thereby reducing the frictional resistance generated at the sliding contact portion of the rotating system component member, and as a result, operating performance and durability Performance is improved.

In addition, one end of the first conduit 41 is inserted into the valve chamber 71 through the hole 74c formed in the valve chamber forming member 74, and the one end of the valve seat member 72 is inserted into the valve chamber 71. By contacting the step portion 72b, the positioning of the first conduit 41 can be easily performed, and the workability at the time of soldering and fixing the conduit 41 is also improved.

Figure 3 shows another embodiment of the electric valve according to the present invention. In FIG. 3, the parts corresponding to the respective parts of the electric valve 10 shown in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted, and the differences will be mainly described below.

In the present embodiment, the valve shaft 60 is connected to the rotor 30 via the nut member 62 so as to be integrally rotated and integrally lifted, and at the same time, the valve shaft 60 and the valve body 61 are separate. . In detail, the valve main body 61 of the separate body is fitted to the cylindrical part 60b formed in the lower part of the said valve shaft 60 in the state which can axially move relative to the valve shaft 60, and can rotate relatively. The valve body 61 is hung so as not to be pulled out by the color 66 fixed to the lower end caulking portion (thin cylindrical portion) 60c of the cylindrical portion 60b. In the cylindrical portion 60b, a coil spring 64 for cushioning which presses the valve body 61 downward through the ball 65 is reduced in size.

Further, a screw feed mechanism 16 for contacting and separating the valve body 61 with the valve seat 22 is provided, and the screw feed mechanism 16 is a guide member 80 'made of a cylindrical tube. Can be screwed into the set screw portion 28 formed on the inner circumference of the nut member 82 fixedly inserted into the upper part of the head) and the set screw portion 28 formed on the outer circumference of the upper half portion 60a of the valve shaft 60. It consists of a movable screw 29. Therefore, in the electric valve 11 of this embodiment, when the rotor 30 can be rotated, the valve shaft 60 can be rotated integrally with it, and at this time, the screw feed mechanism 16 As a result, the valve shaft 60 can rise along the valve body 61, whereby the passage flow rate of the refrigerant is adjusted.

In addition, a fixed stopper 68 and a movable stopper (slider) 69 constituting the rotation limiting stopper mechanism are disposed on the outer circumference of the guide member 80 '. The fixed stopper 68 is a coil spring (curved wire in a spiral shape) whose effective winding number is the right winding direction at 5.5 (five half turns), as shown in Fig. 4A, and the upper end thereof is The upper locking portion 68a bent upward from the spiral portion, and the lower edge portion is the lower locking portion 68b bent downward from the spiral portion. Moreover, as shown in FIG. 4B, the movable stopper 69 is a coil spring (curving a wire in a spiral shape) with an effective winding number of 1.5 (one half winding) and a winding direction to the right. The upper end portion is a lateral projecting contact portion 69a bent laterally from the spiral portion, and the lower end (end) of the spiral portion is an end surface contact portion 69b formed on a flat surface.

Although the diameter of the wire rod which is the material of the movable stopper 69 is slightly larger than the diameter of the wire rod which is the material of the fixed stopper 68, the pitch of the movable stopper 69 and the pitch of the fixed stopper 68 are the same. The fixed stopper 68 (lower locking portion 68b) is fixed to the guide member 80 ', and the movable stopper 69 is assembled to the spiral portion of the fixed stopper 68 as shown in FIG. It is possible to move up and down along the helix.

The side protruding contact portion 69a of the movable stopper 69 is formed by a longitudinally elongated pressure plate 39 protruding from the inner circumference of the rotor 30 at the time of rotation of the rotor 30 (either forward rotation or reverse rotation). It is intended to be pressed. Therefore, when the rotor 30 can rotate clockwise in a plan view, the movable stopper 69 descends while rotating in the same direction, and finally, the lowest position in FIG. 5 is indicated by a solid line. As described above, the end face contact portion 69b abuts against the lower stop portion 68b of the fixed stopper 68, thereby allowing the rotation and the lowering of the rotor 30 to be forcibly stopped. When the rotor can be rotated in the counterclockwise direction in plan view, the movable stopper 69 rises while rotating in the same direction, and finally, as shown in the virtual line in FIG. The lateral protruding contact portion 69a abuts against the upper locking portion 68a of the fixed stopper 68, whereby the rotation and lift of the rotor 30 can be forcibly stopped.

On the other hand, in the present embodiment, the valve body 70 has a valve seat member 72 and a valve chamber forming member 74 having the same configuration as those of the above-described embodiment, and a connection holding member having a configuration different from that of the above-described embodiment ( 76 '). The connection holding member 76 'of the present embodiment is a simple circular ring plate, and the outer circumferential portion is mounted on the can flange flange portion 74a of the valve chamber forming member 74 and weld-joined as in the above-described embodiment, An inner circumference is connected and fixed to the lower end of the guide member 80 'by welding. In this case, since there is no cylindrical portion 76a fitted to the inner circumference of the valve chamber forming member 74 in the connection holding member 76 'of the present embodiment, the valve chamber forming member 74 is not present. In the case of welding welding on the substrate, positioning is performed using a jig or the like to raise the coaxiality.

At this time, the connection holding member 76 'is formed with a pressure equalizing hole 77 for achieving uniform pressure in the valve chamber 71 and the can 40. In addition, as in the above embodiment, the outer diameter side of the connection holding member 76 'is smaller than the outer diameter of the can flange flange portion 74a of the valve chamber forming member 74, and the can flange flange portion 74a is connected to the holding member. The lower end portion 40b of the can 40 is joined to the stepped portion 73 formed of 76 '(the outer circumferential end surface thereof), and is hermetically sealed by welding (welding portion K).

Also in the electric valve 11 of such a structure, the action and effect similar to the said Example are acquired, the cost reduction of a valve main-body part is intended, and the coaxial degree of a rotation system structural member is not sufficient as the said Example, but sufficient. It can be secured.

At this time, when the guide member is made into a cylindrical tube shape, the guide member and the connection holding member can be integrally formed by press working. In this manner, by integrally molding the guide member and the connection holding member, cost reduction is further intentional and higher coaxiality can be ensured.

In the electric valve according to the present invention, the valve main body part is divided into several parts, and the part (valve seat part) which becomes a complicated shape is made into shape and size which can be easily produced by cutting, and the other part is press-worked. Since it is easily divided and manufactured into parts of a shape capable of ensuring high accuracy, and then assembled, they are intended to reduce the cost of the valve body, and at the same time, rotor, valve body, can, valve shaft, A predetermined coaxiality can be obtained in the guide member or the like.

In particular, the valve chamber forming member has a cylindrical shape with a flange-shaped portion, and the connection retaining member is mounted on a cylindrical portion fitted to the inner circumference of the valve chamber forming member, and on the can flange flange portion of the valve chamber forming member to be welded. The flange-shaped portion formed of the flange-shaped portion and the hole-forming bottom portion holding and guiding the guide member has a cylindrical shape, and is joined by welding by joining the lower end of the can to the step portion formed by the valve chamber forming member and the connection holding member. By doing so, it is possible to prevent almost any deviation from the rotational axis and the central axis of all the rotational system members, and to secure a high coaxiality to them, whereby the friction generated at the sliding contact portion of the rotational system component members The resistance is reduced, and as a result, operating performance, durability, and the like are improved.

Further, by inserting one end of the refrigerant conduit for entering and exiting the valve chamber into the valve chamber through the hole formed in the valve chamber forming member, the end of the conduit can be easily contacted with the valve seat member. The workability at the time of soldering a conduit is also improved.

Claims (7)

A valve body having a valve shaft having a valve body, a valve body having the valve seat in contact with and detaching the valve body, a can joined to the valve body, a rotor disposed on an inner circumference of the can, and for driving the rotor to rotate. A guide member having a stator disposed on an outer circumference of the can, a guide member that is held and fixed to the valve body, and guides the valve shaft, and is disposed between the rotor and the valve body to rotate the rotor. Is provided with a screw feed mechanism for contacting and separating the valve body to the valve seat using, The valve body includes a valve seat member manufactured by cutting, a cylindrical valve chamber forming member manufactured by press working, and a canister flange-shaped part attached thereto, and manufactured by press working so that the outer peripheral side forms the valve chamber. It is made of a connection holding member mounted on the can flange flange shape of the member and welded to hold the guide member on the inner circumferential side, The connection holding member is a cylindrical portion inserted into an inner circumference of the valve chamber forming member, an upper flange shape portion mounted on the can flange flange portion of the valve chamber forming member and welded to the valve chamber forming member, and holding the guide member. An electric valve, characterized in that the bottom is formed in a cylindrical shape with a flange-shaped portion formed of a hole-forming bottom portion. delete delete The method of claim 1, The outer diameter side of the upper flange portion is smaller than the outer diameter of the can flange flange portion of the valve chamber forming member, and the lower end portion of the can is joined to the step formed in the can flange flange portion and the upper flange portion to weld. An electric valve characterized in that the sealing is joined by. The method of claim 1, And the guide member is fixed to the inner circumferential portion of the hole-forming bottom portion. delete The method according to claim 1 or 4, And an end portion of the refrigerant inlet conduit is inserted into the valve chamber through the hole formed in the valve chamber forming member, and the one end portion makes contact with the valve seat member.

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