JPH05141561A - Fluid control valve - Google Patents

Abstract

PURPOSE:To simply and inexpensively cancel the change in fluid pressure by simultaneously applying the fluid pressure inside a primary flow passage both to the front surface of a valve body equipped with a diaphragm and facing to the primary flow passage and to the rear surface thereof facing to a pressure-receiving chamber into which the fluid pressure is introduced. CONSTITUTION:When a solenoid 7 is not energized, the attraction between a fixed iron core 9 and a movable iron core 15 is not caused, so that a movable iron core body T (not shown) is depressed downwards by a spring 20. Accordingly, the valve part 14B of a valve body 14 to which a diaphragm 18 has been fixed is abutted on the valve seat 1, and the communication between primary and secondary flow passages 2 (not shown), 3 is cut off. When the fluid pressure inside the primary flow passage 2 changes, the fluid pressure acts on the front surface 14A of the valve body 14. At the same time, this fluid pressure is introduced into a pressure-receiving chamber R passing through a pressure-introducing passage 17 of the valve body 14, and acts also on the rear surface 14C of the valve b6cf7 14. As a result, since the same fluid pressure can be simultaneously applied both to the front surface 14B and to the rear surface 14A of the valve body 14, the pressure change inside the primary flow passage 2 can be canceled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid control valve used for controlling fluid in various industrial equipment, and in particular, an electromagnetic type in which a movable iron core is attracted by a magnetic force generated in a solenoid to control opening and closing of a valve seat. Fluid control valve.

[0002]

2. Description of the Related Art A conventional fluid control valve is disclosed in Japanese Patent Laid-Open No. 1-1163.
No. 06 publication. According to this, the shaft extends vertically along the longitudinal axis direction of the movable core that is arranged to face the fixed core, and the bellows with the valve body that can close the valve seat is fixed to the upper end of the shaft. The lower end of the shaft penetrates the fixed core and projects outside the fixed core. The central portion of the first leaf spring is fixedly arranged on the shaft between the bellows and the upper end of the movable iron core, and the outer peripheral end of the first leaf spring is arranged in a positioning storage hole formed in the valve body. Fixed. Further, the central portion of the second leaf spring is fixedly arranged through a press-fitting plug at the lower end of the shaft penetrating the fixed iron core and projecting downward, and the outer peripheral end of the second leaf spring is at the valve body. Is positioned and fixed in the positioning storage hole. As described above, since the shaft is supported by the first leaf spring and the second leaf spring, the shaft is allowed to move in the longitudinal axis and the runout in the circumferential direction orthogonal to the longitudinal axis is prevented. Be deterred.

Further, since the bellows having the valve element is arranged on the shaft, when the fluid pressure in the primary channel is changed, the pressure in the primary channel is simultaneously applied to the front and rear surfaces of the valve element. It is necessary to cancel the pressure and keep the suction of the movable core constant with respect to the magnetic force generated in the solenoid.

[0004]

The conventional fluid control valve described above has the following problems. The bellows has its central part fixed to a shaft integrally formed with the movable iron core, and the outer peripheral part is fixed to the valve body. Magnetic force is generated in the solenoid, and the movable iron core is attracted to the fixed iron core. When the bellows move, the contraction deformation of the bellows portion resists the movement of the movable core. Therefore, it is desirable that the bellows, especially the bellows part, be deformed by an extremely weak force, and is generally formed by cutting out an expensive synthetic resin material. For example, a tetraboride ethylene resin. According to this, a large-diameter round bar is cut out to form, the yield of the material is poor, the processing of the bellows is difficult, the machining time is long, and the material is expensive, so the manufacturing cost of the bellows is high. Was greatly increased, which was not preferable.
The shaft extends vertically from the movable iron core and is formed to be considerably longer than the movable iron core, and the diameter and straightness of the shaft must be accurately formed. If the shaft is not accurately formed, the through hole of the fixed core comes into contact with the shaft, which is not preferable for the operation of the movable core.
For this reason, the processing time and inspection time of the shaft are lengthened, and the material cost is increased, so that the manufacturing cost of parts is increased, which is not preferable. Since it is necessary to form a through hole in the fixed iron core, and this through hole also needs to be accurately formed, the manufacturing cost of parts is increased as in the case of the shaft. By arranging the second leaf spring at the end of the shaft that penetrates the fixed iron core, the length of the fluid control valve in the axial direction of the shaft becomes large and cannot be compacted. Freedom is hindered.

The fluid control valve according to the present invention has been made in view of the above problems. An object of the fluid control valve is to reduce the manufacturing cost by providing a new pressure canceling mechanism in place of the bellows and to make the fluid control valve compact. And

[0006]

According to the present invention, the valve seat is divided into a primary side flow passage and a secondary side flow passage, and the positioning storage hole is formed from the secondary side flow passage through the locking step portion. Is formed into a tubular body made of a magnetic material, and a fixed iron core around which a solenoid is wound is magnetically coupled and disposed inside the valve body. The housing body is provided with a lower part of the insertion tube part to be inserted into the positioning storage hole and the cylindrical body is made of a non-magnetic material, and is arranged on the locking step part of the valve body and the positioning storage hole. An insertion cylinder part to be inserted therein, a bottomed cup-shaped valve body storage chamber whose lower end opens toward the valve seat, and a through hole which is located in the center thereof and opens toward the bottom part of the valve storage chamber. Of the pressure receiving chamber forming body having a shaft and the through hole of the pressure receiving chamber forming body that penetrates in the vertical direction. The end, the rear surface faces the valve body accommodating chamber,
A valve body having a valve portion for closing the valve seat on the front surface and fixedly arranging a valve body having a pressure introducing passage penetrating the front surface and the rear surface, and a center portion of a diaphragm integrally disposed on the valve body The outer peripheral end is fixedly arranged at the lower end of the valve body storage chamber, and the valve seat side opening of the valve body storage chamber is closed and held by the valve body and diaphragm, while the upper end of the shaft faces the fixed iron core. And a movable iron core body on which the movable iron core is arranged.

[0007]

The valve body is fixed to the lower end of the shaft and faces the valve body storage chamber, and the lower end of the valve body storage chamber is closed by the valve body and the diaphragm to form a pressure receiving chamber in the valve body storage chamber. The pressure in the primary side flow passage is introduced into the valve via the pressure introduction passage that penetrates the valve body. The pressure in the primary side flow passage acts on the rear part of the valve body that opens into the pressure receiving chamber where the pressure in the primary side flow passage is introduced via the front surface facing the primary side flow passage of the valve body and the pressure introduction passage. Therefore, the pressure of the primary side flow path with respect to the valve body is canceled. Further, since the shaft is guided and supported by the through hole, the movable iron core is centered and supported by the pressure receiving chamber forming body.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the fluid control valve according to the present invention will be described below with reference to FIGS. The inside of V is divided into a primary side flow passage 2 and a secondary side flow passage 3 by a valve seat 1, and a positioning storage hole 5 is located above the secondary side flow passage 3 via a locking step portion A. It is the valve body that opens toward. The positioning storage hole 5 has a circular cross section.

Reference numeral H is a cylindrical housing body made of a magnetic material. The housing body H has an upper tubular portion 6A.
And an inner flange 6C having an insertion protrusion 6B located below and an upper cylinder 6A and an insertion cylinder 6B facing inward and having a through hole formed in the center thereof. A coil bobbin 8 around which a solenoid 7 is wound is arranged, a fixed iron core 9 is inserted into the coil bobbin 8 through an opening above the coil bobbin 8, and a collar portion 9A extending from above the fixed iron core 9 to the side.
Is fixed to the upper tubular portion 6A of the housing body H by crimping. That is, the coil bobbin 8 around which the solenoid 7 is wound and the fixed iron core 9 are fixed to the housing body H.
The insertion tube portion 6B has a shape to be inserted or press-fitted into the positioning storage hole 5 of the valve body V.

P is a pressure receiving chamber forming member made of a non-magnetic material, and is composed of the following. The pressure receiving chamber forming body P has a cylindrical insertion tube portion 10 formed above the pressure receiving chamber forming body P and a concave portion 11B below.
Is formed, and a central protrusion 12 is formed at the center thereof. The insertion tube portion 10 is disposed on the locking step portion 4 of the valve body V and inserted in the positioning storage hole 5, and the valve body storage chamber 11 has a bottomed portion in which a recess 11B opens toward the valve seat 1. The valve seat 1 of the valve body storage chamber 11 is formed in a cup shape.
The lower end 11C on the side does not contact the valve seat 1 and has a gap S. A through hole 12A is formed in the center of the central protrusion 12 so as to penetrate therethrough in the vertical direction. The lower end of the through hole 12A is opened to the bottom portion 11A of the valve body storage chamber 11, and the through hole 1
The upper end of 2A opens to the upper end of the central protrusion 12.

T is a movable iron core having the following structure. Reference numeral 13 denotes a through hole 12 of the central protrusion 12 of the pressure receiving chamber forming body P.
A valve body 14 is fixedly arranged at the lower end of the shaft 13 which is a shaft that penetrates through A in the vertical direction and projects from the upper end of the central protrusion 12 and the bottom part 11A of the valve body storage chamber 11.
A movable iron core 15 is arranged at the upper end of the shaft 13.

The valve body 14 is arranged toward the valve body storage chamber 11, and more specifically, the step portion 13 provided at the lower end of the shaft 13.
It is fixed to A via the guide plate 16. A valve portion 14B that opens and closes the valve seat 1 is provided on the front surface 14A of the valve body 14 that faces the primary side flow path 2, and a front surface 14A of the valve body 14 and a guide plate 16 corresponding to the rear surface 14C of the valve body 14 are provided. A pressure introducing passage 17 that communicates with the primary passage 2 penetrates through the valve body storage chamber 11 side.

Reference numeral 18 denotes a diaphragm made of a flexible material such as rubber, and its annular center portion is sandwiched between the valve body 14 and the guide plate 16 and fixed to the valve body 14 (to the shaft 13). The annular outer peripheral end of the diaphragm 18 is fixed to the lower end 11C of the valve body storage chamber 11. According to the above, the lower end 11 of the valve body storage chamber 11 facing the valve seat 1 side
The opening of C is closed by the diaphragm 18 and the valve body 14, a pressure receiving chamber R is formed in the valve body housing chamber 11, and the valve body 14 can move to the pressure receiving chamber R side in synchronization with the shaft 13. Furthermore, the pressure introducing passage 17 always connects the pressure receiving chamber R and the primary side passage 2.

A movable iron core 15 made of a magnetic material is fixedly arranged on the upper end of the shaft 13, and a fixed iron core 9, an upper tubular portion 6A of the housing H, an inner flange portion 6C, and a movable iron core 15 form a solenoid 7. A magnetic circuit is formed.

Next, the assembling of the fluid control valve will be described. First, the assembling of the movable iron core T and the pressure receiving chamber forming body P will be described with reference to FIG. The shaft 13 having the movable iron core 15 formed on the upper portion is inserted downward from above the through hole 12A formed in the central protrusion 12 of the pressure receiving chamber forming body P, and protrudes to the bottom portion 11A in the valve body storage chamber 11. The valve body 14 is attached to the lower end of the shaft 13. The valve body 14 is attached to the lower end of the shaft 13 as follows. Step 13 of shaft 13
The guide plate 16 is arranged on A, and the guide plate 1
After disposing the central portion of the diaphragm 18 on the lower surface of 6, the valve body 14 is disposed on the diaphragm 18, and the end portion of the shaft 13 projecting from the valve body 14 is laterally enlarged and caulked.
According to this, the guide plate 16 and the valve body 14 can be fixed on the stepped portion 13A of the shaft 13, and the central portion of the diaphragm 18 is fixed between the guide plate 16 and the valve body 14. (For ease of explanation, the valve body 14 includes a guide plate 16) On the other hand, the outer peripheral end of the diaphragm 18 is attached to the lower end 11C of the valve body storage chamber 1 at the ring plate 1
It is fixed by crimping through 9.

Through the above, the through hole 12 of the pressure receiving chamber forming body P is formed.
The shaft 13 of the movable iron core body T is movably supported and attached to A, and the valve body storage chamber 11 of the pressure receiving chamber forming body P is attached.
The lower end 11C of the valve has an opening including a valve body 14 including a diaphragm 18.
Is closed by the pressure receiving chamber R in the recess 11B of the valve body storage chamber 11.
Is formed.

The inserting cylinder portion 10 of the pressure receiving chamber forming body P having the movable iron core body T is inserted into the positioning accommodating hole 5 of the valve body V and arranged on the locking step portion 4 of the valve body V. According to this, the valve portion 14B of the valve body 14 provided in the pressure receiving chamber forming body P is arranged to face the valve seat 1.

Then, the insertion cylinder portion 6B of the housing body H is press-fitted into the positioning storage hole 5. According to this, the insertion tube portion 6B of the housing body H can be fixedly arranged on the insertion tube portion 10 of the pressure receiving chamber forming body P in the positioning storage hole 5, and the movable iron core 15 of the movable iron core body T can be Spring 20
Is arranged to face the fixed iron core 9 through. This completes the assembly of the fluid control valve.

Next, the operation will be described. First, when the solenoid 7 is in the non-energized state, no attractive force is generated between the fixed iron core 9 and the movable iron core 15. Thus, the movable iron core body T is pressed downward by the spring force of the spring 20, the valve portion 14B of the valve body 14 is brought into contact with the valve seat 1, and the primary side flow passage 2 and the secondary side flow passage 3 are separated from each other. Blocked and retained. When the fluid pressure in the primary side flow passage 2 changes in this closed state, the fluid pressure in the primary side flow passage 2 acts on the front surface 14A of the valve body 14 opening toward the valve seat 1. On the other hand, the fluid pressure in the primary side flow passage 2 acts on the pressure receiving chamber R of the rear surface 14C of the valve body 14 through the pressure introducing passage 17 formed in the valve body 14, and acts on the rear surface 14C of the valve body 14. .. (The pressure receiving chamber R communicates upward through the through hole 12A of the pressure receiving chamber forming body P, but since the opening of the positioning storage hole 5 is closed by the housing body H, the pressure receiving chamber R that is hermetically sealed is maintained. Therefore, since the same fluid pressure in the primary side flow passage 2 can be simultaneously applied to the front surface 14A of the valve body 14 and the rear surface 14C including the diaphragm 18, the pressure change in the primary side flow passage 2 is canceled. The movable iron core body T can be pressed and held toward the valve seat 1 by a constant pressing force. Movable iron core T
Means that even if the fluid pressure in the primary side flow path 2 changes, it can always be attracted toward the fixed iron core 9 with a constant magnetic attraction force.

At this time, the effective pressure receiving area of the rear surface 14C of the valve body 14 including the diaphragm 18 which opens into the valve body storage chamber 11 (pressure receiving chamber R) and the primary side flow passage 2 facing the valve seat 1. When the effective pressure receiving area of the front surface 14A of the valve body 14 that opens is made substantially the same, the influence of the fluid pressure change in the primary side flow path 2 can be completely canceled.

Then, when the solenoid 7 is energized, a magnetic circuit is formed by the fixed iron core 9, the housing body H, and the movable iron core 15, and the movable iron core 15 of the movable iron core body T springs the spring 20 according to the magnetic attraction force. The valve element 14 is attracted to the fixed iron core 9 against the force, the valve element 14 moves upward in the valve element housing chamber 11, the valve portion 14B of the valve element 14 opens the valve seat 1, and the primary side passage The fluid in 2 flows into the secondary side flow path 3 via the valve seat 1. When the movable iron core body T is moved, since the movable iron core body T is centered and supported by the through hole 12A, the movable iron core body T is smoothly moved linearly without swinging.

In FIGS. 3 and 4, the through hole 1 of the shaft 13 is shown.
2A shows another embodiment of centering support by 2A. In this example, the through hole 12A abuts on the outer periphery of the shaft 13 by the four guide protrusions 12C in the cross section,
The guide projection 12C is formed in the longitudinal axis direction X- of the shaft 13.
It is formed along X. According to the above, the sliding resistance of the shaft 13 can be reduced as compared with the centering support by the through hole 12A having a circular cross section, and the dynamic characteristics of the movable core body T can be improved. The cross-sectional shape of the through hole 12A may be circular and the shaft may be provided with a guide protrusion.

FIG. 5 shows still another embodiment of the centering support by the through hole 12A of the shaft 13. A pair of annular flange portions 13B are provided at intervals in the vertical direction in the longitudinal axis direction XX of the shaft 13, and one annular flange portion 13B is provided.
B is slidably guided near the upper portion of the through hole 12A, and the other annular flange portion 13B is slidably guided near the lower portion of the through hole 12A. According to the above, the sliding area between the shaft 13 and the through hole 12A can be made smaller than that in the second embodiment, so that the sliding resistance of the shaft 13 can be further reduced and the movement of the movable iron core body T can be reduced. The characteristics can be further improved.

[0024]

According to the fluid control valve of the present invention, it is divided into the primary side flow passage and the secondary side flow passage by the valve seat, and the positioning storage hole is formed from the secondary side flow passage through the locking step portion. Is formed into a tubular body made of a magnetic material, and a fixed iron core around which a solenoid is wound is magnetically coupled and disposed inside the valve body. The housing body is provided with a lower part of the insertion tube part to be inserted into the positioning storage hole and the cylindrical body is made of a non-magnetic material, and is arranged on the locking step part of the valve body and the positioning storage hole. An insertion cylinder part to be inserted therein, a bottomed cup-shaped valve body storage chamber whose lower end opens toward the valve seat, and a through hole which is located in the center thereof and opens toward the bottom part of the valve storage chamber. And a shaft arranged so as to vertically penetrate through a through hole of the pressure receiving chamber forming body. The lower end, the rear surface faces the valve body accommodating chamber,
A valve body having a valve portion for closing the valve seat on the front surface and fixedly arranging a valve body having a pressure introducing passage penetrating the front surface and the rear surface, and a center portion of the diaphragm integrally disposed on the valve body The outer peripheral end is fixedly arranged at the lower end of the valve body storage chamber, and the valve seat side opening of the valve body storage chamber is closed and held by the valve body and diaphragm, while the upper end of the shaft faces the fixed iron core. Since it is composed of a movable iron core body in which a movable iron core is arranged, it is possible to provide a pressure canceling mechanism with a diaphragm without using a bellows. It is possible to significantly reduce the manufacturing cost of the valve. Further, since the centering support of the movable iron core body is supported by the through hole of the pressure receiving chamber forming body, it is not necessary to prepare a special centering support member, which also contributes to the reduction of the manufacturing cost.

Further, the effective pressure receiving area of the rear surface of the valve body including the diaphragm opening to the valve body accommodating chamber and the effective pressure receiving area of the front surface of the valve body facing the valve seat and opening to the primary side passage are substantially the same. According to this, the pressure in the primary side flow path for the valve body can be completely canceled, and the dynamic characteristics of the movable iron core including the valve body can be excellently maintained.

The centering support between the shaft and the through hole is such that the outer circumference of the shaft and the inner circumference of the through hole are in partial contact with each other at least at three or more locations in the circumferential direction, and are continuous in the longitudinal axis direction of the shaft. Centering support by the guide protrusions that come into contact with each other, and further, centering support between the shaft and the through hole is formed in the vicinity of the upper part and the lower part of the through hole, and a pair of annular flange parts formed outward from the shaft. Since the centering support is used, the sliding resistance of the movable core body including the shaft can be reduced, and the enlargement of the solenoid can be suppressed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a fluid control valve according to the present invention.

FIG. 2 is a vertical sectional view showing an assembled state of the pressure receiving chamber forming body and the movable iron core body in FIG.

FIG. 3 is a vertical cross-sectional view showing another example of the assembled state of the pressure receiving chamber forming body and the movable iron core body.

FIG. 4 is a cross-sectional view of a main part taken along the line NN of FIG.

FIG. 5 is a vertical sectional view showing still another embodiment of the assembled state of the pressure receiving chamber forming body and the movable iron core body.

[Explanation of symbols]

 1 Valve Seat 2 Primary Side Flow Path 3 Secondary Side Flow Path 4 Locking Step 5 Positioning Storage Hole 6B Inserted Tube 7 Solenoid 9 Fixed Iron Core 10 Inserted Tube 11 Valve Body Storage Room 11A Bottom 12A Through Hole 12C Guide Projection 13 shaft 13B annular collar portion 14 valve body 14B valve portion 15 movable iron core 17 pressure introduction path 18 diaphragm H housing body V valve body P pressure receiving chamber forming body R pressure receiving chamber T movable iron core body

Claims (5)

[Claims] 1. A primary side flow passage 2 and a secondary side flow passage 3 at a valve seat 1.
And a valve body V in which the positioning storage hole 5 is opened toward the end A from the secondary side flow path 3 via the locking step portion 4.
And a fixed iron core 9 around which a solenoid 7 is wound is magnetically coupled and disposed inside the tubular body made of a magnetic material, and a positioning storage hole 5 for the valve body V is formed.
A housing body H having an insertion cylinder portion 6B inserted in the lower part thereof and a cylindrical body formed of a non-magnetic material, and is arranged on the locking step portion 4 of the valve body V and has a positioning storage hole. 5, an insertion cylinder portion 10 inserted into the valve body 5, a bottomed cup-shaped valve body storage chamber 11 having a lower end opened toward the valve seat 1, and a bottom portion 11A of the valve body storage chamber 11 at the center thereof. A pressure receiving chamber forming body P having a through hole 12A that is opened in a vertical direction, and a rear surface 14C at a lower end of a shaft 13 that is arranged so as to vertically pass through the through hole 12A of the pressure receiving chamber forming body P. The valve body 14 having the valve portion 14B for closing the valve seat 1 on the front surface 14A and having the pressure introduction passage 17 penetrating the front surface 14A and the rear surface 14C is fixedly arranged and the central portion thereof is a valve. Outer peripheral edge of diaphragm 18 integrally arranged on body 14 Fixedly disposed at the lower end of the valve body accommodating chamber 11, the valve seat 1 opening the valve body to the side 1 of the valve body accommodating chamber 11
4 and a diaphragm 18 to close and hold the movable iron core body T having a movable iron core 15 arranged on the upper end of the shaft 13 so as to face the fixed iron core 9 and to move the movable iron core body T in accordance with the magnetic force generated in the solenoid. A fluid control valve that is operated toward the fixed core 9. 2. The effective pressure receiving area of the rear surface 14A of the valve body 14 including the diaphragm 18 which opens into the valve body storage chamber 11 and the front surface of the valve body 14 which faces the valve seat 1 and opens to the primary side flow passage 2. The fluid control valve according to claim 1, wherein the effective pressure receiving area of 14A is substantially the same. 3. The fluid control valve according to claim 1, wherein the shaft 13 is centeringly supported by a through hole 12A. 4. The centering support between the shaft 13 and the through hole 12A is performed by the outer circumference of the shaft 13 and the through hole 12A.
The inner circumference of A partially contacts at least three places in the circumferential direction, and the longitudinal axis direction X of the shaft 13
The fluid control valve according to claim 3, which is centered and supported by a guide protrusion 12C that continuously contacts at -X. 5. The centering support between the shaft 13 and the through hole 12A is provided by a pair of annular flange portions 13B, 13B formed outward from the shaft 13 near the upper portion and the lower portion of the through hole 12A. The fluid control valve according to claim 3, wherein the fluid control valve is supported by centering.