JPH05141560A - 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 facing to the primary flow passage and to the rear surface thereof facing to a pressure-receiving chamber into which the fluid pressure inside the primary flow passage 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 is depressed downwards by a spring 20. Accordingly, the valve part 16 of a valve body 14 is abutted on the valve seat 1, and the communication between primary and secondary flow passages 2, 3 is cut off. When the fluid pressure inside the primary flow passage 2 changes, this fluid pressure acts on the front surface 14B 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 14A of the valve body 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. In addition, the arrangement of the bellows with the valve element on the shaft means that when the fluid pressure in the primary side flow passage changes, the pressure in the primary side flow passage is simultaneously applied to the front and rear surfaces of the valve body to increase the pressure. It is necessary to cancel and keep the attraction of the movable iron 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, it is formed by cutting out a large-diameter round bar, the yield of the material is poor, the processing of the bellows is difficult, the cutting time is long, and the material is expensive Was greatly increased, which was not preferable. According to the use of synthetic resin material for the bellows,
When equipment with different fluid specifications is used,
The development efficiency was poor because it was necessary to carry out a durability test according to the fluid and usage conditions (temperature, pressure, etc.). The central portion of the leaf spring is press-fitted and fixed to the movable iron core (including the shaft) by the movable iron core and the press-fitting member, which increases the number of parts and press-fitting work, resulting in high manufacturing cost. It is not desirable to invite. 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 it cannot be compactly assembled. Freedom is hindered. The fluid control valve according to the present invention has been made in view of the above-mentioned problems, and it is possible to reduce the manufacturing cost by providing a novel pressure canceling mechanism in place of the bellows and to provide a fluid control valve having high versatility. To aim.

[0005]

According to the present invention, a valve seat divides a primary side flow passage and a secondary side flow passage, and the secondary side flow passage is positioned and stored via a locking step portion. A valve body having a hole opening toward the end; a cylindrical body made of a magnetic material, in which a fixed iron core around which a solenoid is wound is magnetically coupled and arranged. A housing body provided with a lower portion of an insertion cylinder portion to be inserted into a positioning storage hole of the valve body; and a cylindrical body formed of a non-magnetic material, which is arranged on the locking step portion of the valve body and positioned. An insertion cylinder part inserted into the storage hole, a bottomed cup-shaped valve body storage chamber whose lower end opens toward the valve seat, and a penetrating opening at the center of the valve body storage chamber toward the bottom of the valve body storage chamber. A pressure receiving chamber forming body having a hole; and a shuff arranged vertically through a through hole of the pressure receiving chamber forming body. At the lower end of the valve, a valve part that is labyrinth-sealed against the sliding surface of the valve body storage chamber and can move in the valve body storage chamber and that controls the opening and closing of the valve seat, and pressure introduction that penetrates the front and rear surfaces of the valve body A fluid control valve is formed by a movable iron core body in which a valve body having a passage is arranged, and a movable iron core opposite to a fixed iron core is arranged at the upper end of a shaft.

[0006]

The pressure receiving chamber is formed in the rear portion of the valve body that is labyrinth-sealed with respect to the sliding surface of the valve body housing chamber, and the pressure in the primary side flow passage is introduced into this pressure receiving chamber through the pressure introduction passage. It
The pressure in the primary side flow passage acts on the front surface facing the primary side flow passage of the valve body and the rear part of the valve body opening into the pressure receiving chamber where the pressure in the primary side flow passage is introduced through the pressure introduction passage. Therefore, the pressure of the primary side flow path to the valve body is canceled. or,
The movable iron core is centered and supported by the valve body being labyrinth-sealed in the valve body accommodating chamber, which eliminates the need for centering support by a leaf spring.

[0007]

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 the positioning storage hole 5 is located above the secondary side flow passage 3 via a locking step portion 4. The valve body is open toward A. 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 portion 6C which is located between the upper cylinder portion 6A and the insertion cylinder portion 6B and faces inward and has 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 9 that extends laterally from above the fixed iron core 9.
A is crimped and fixed to the upper tubular portion 6A of the housing body H. 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 the valve body storage chamber 1 below
1 is formed, and a central protrusion 12 that connects the insertion cylinder portion 10 and the valve body storage chamber 11 is formed in the central portion thereof. The insertion tube portion 10 is disposed on the locking step portion 4 of the valve body V and inserted into the positioning storage hole 5, and the valve body storage chamber 11 has a bottomed cup shape that opens toward the valve seat 1. The end portion 11C of the valve body storage chamber 11 on the valve seat 1 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 in the vertical direction. The lower end of the through hole 12A is opened to the bottom 11A of the valve body storage chamber 11, and the upper end of the through hole 12A is formed. It opens at the upper end of the central protrusion 12.

T is a movable iron core having the following structure. Reference numeral 13 denotes a shaft which vertically penetrates through the through hole 12A of the pressure receiving chamber forming body P and projects from the upper end of the central protrusion 12 and the bottom 11A of the valve body storage chamber 11.
A valve body 14 is fixedly arranged at the lower end of the shaft 13 and
A movable iron core 15 is arranged at the upper end of the. The valve body 14 is labyrinth-sealed with respect to the sliding surface 11B formed on the inner wall of the valve body storage chamber 11, and is arranged in the valve body storage chamber 11 so as to be vertically movable. Labyrinth seal (l
The abyrinth seal is a sealing mechanism in which a multi-stage annular seal groove K is provided in a part of the sliding surface to prevent gas leakage. In this example, the annular seal groove K is the valve body storage chamber 11
An annular groove is provided in two steps on the outer circumference of the valve body 14 that is in sliding contact with the sliding surface 11B. The valve body 14 is fixedly arranged at the lower end of the shaft 13 to form a pressure receiving chamber R by the rear surface 14A of the valve body 14 and the valve body accommodating chamber 11. Further, a valve body 16 is formed on the lower surface of the valve body 14 facing the valve seat 1, and further, the front surface 14B of the valve body 14 on the valve seat 1 side (facing the primary side flow path 2) and the valve body Rear surface 14
The pressure introduction path 17 penetrates the hole A. That is, the pressure receiving chamber R on the rear surface 14 </ b> A of the valve body 14 and the primary side flow path 2 are always in communication with each other by the pressure introduction path 17 formed in the valve body 14. A movable iron core 15 made of a magnetic material is fixedly arranged on the upper end of the shaft 13. The fixed iron core 9, the upper protrusion 6A of the housing H, the inner flange 6C, and the movable iron core 15 form a magnetic circuit of the solenoid 7. Is formed.

Next, the assembly of the fluid control valve will be described. First, assembling of the movable iron core body 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 in the upper portion is inserted downward from above the through hole 12A formed in the central projection 12 of the pressure receiving chamber forming body P,
The shaft 13 protruding to the bottom portion 11A in the valve body storage chamber 11
The valve element 14 is press-fitted into the lower end of the. According to this, the valve body 14 arranged at the lower end of the shaft 13 is slidably arranged in the valve body storage chamber 11, and the annular seal groove K provided on the outer periphery of the valve body 14 allows the valve body storage chamber to be closed. 11 sliding surface 11B
On the other hand, the valve element 14 is hermetically sealed in a labyrinth.

Then, the pressure receiving chamber forming body P having the movable iron core body T is inserted or press-fitted into the valve body V as follows. The insertion tube portion 10 of the pressure receiving chamber forming body P is inserted into the positioning storage hole 5 from the end portion A of the valve body V, and the bottom portion 10A of the insertion tube portion 10 is arranged on the locking step portion 4 of the valve body V. According to this, the end portion 11C of the valve body storage chamber 11 of the pressure receiving chamber forming body P faces the valve seat 1 and is arranged with a gap S from the valve seat 1, and the valve portion 16 of the valve body 14 has the valve seat 1 Is placed opposite to.

Next, the insertion tube portion 6B of the housing body H having the solenoid 7 and the fixed iron core 9 is press-fitted from the end portion A of the valve body V into the positioning housing hole 5. According to this, the lower end of the insertion cylinder portion 6B of the housing body H abuts on the upper end of the insertion cylinder portion 10 of the pressure receiving chamber forming body P, and the movable iron core 15 of the movable iron core body T is arranged to face the fixed iron core 9. It will be. Reference numeral 20 is a spring that is contracted between the fixed iron core 9 and the movable iron core 15.

According to the above, the valve body 14 of the movable iron core body T is
However, since the sliding surface 11B of the valve body storage chamber 11 of the pressure receiving chamber forming body P is labyrinth-sealed, the movable iron core body T is centered and supported by the pressure receiving chamber forming body P and the valve body 1
The valve portion 16 of No. 4 is arranged to face the valve seat 1, and the movable iron core 15 is arranged to face the fixed iron core 9.

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 16 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. Although the fluid in the primary side flow path 2 flows into the pressure receiving chamber P via the pressure introducing path 17, the sliding surface 11B between the valve body 14 and the valve body housing chamber 11
Since and are labyrinth sealed, fluid cannot leak.
When the fluid pressure in the primary side flow passage 2 changes in the closed state, the fluid pressure in the primary side flow passage 2 acts on the front surface 14B of the valve body 14 opening toward the valve seat 1. On the other hand, the fluid pressure in the primary side flow path 2 is transmitted through the pressure introducing passage 17 formed in the valve body 14 to the pressure receiving chamber P on the rear surface 14A of the valve body 14.
It acts inward and acts on the rear surface 14B of the valve element 14. (The pressure receiving chamber P 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 P 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 14B and the rear surface 14A of the valve body 14, the pressure change in the primary side flow passage 2 can be canceled. , The movable iron core body T with a constant pressing force
Can be pressed and held toward the valve seat 1. In other words, the movable iron core body T always has a fixed magnetic attraction force even if the fluid pressure in the primary side flow path 2 changes.
It means that it can be sucked toward.

At this time, the effective pressure-receiving area of the rear surface 14A of the valve body 14 opening to the valve body storage chamber 11 and the front surface 14B of the valve body 14 facing the valve seat 1 and opening to the primary side flow passage 2 are shown. When the effective pressure receiving area is made substantially the same, the influence of the fluid pressure change in the primary side flow path 2 can be completely canceled.

Next, 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 has a spring force of a spring 20 according to a magnetic attraction force. Fixed iron core 9 against
The valve body 14 moves upward in the valve body storage chamber 11 and the valve portion 16 of the valve body 14 opens the valve seat 1,
The fluid in the primary side flow passage 2 flows into the secondary side flow passage 3 via the valve seat 1. When the movable iron core body T is moved, the movable iron core body T has the valve body 14 with the sliding surface 11 of the valve body storage chamber 11.
Since the movable iron core body T is centered and supported with respect to B, the movable iron core body T can be smoothly moved linearly without swinging.

Further, as shown in FIG. 3, the outer periphery of the valve body 14 is labyrinth-sealed with respect to the sliding surface 11B of the valve body storage chamber 11 for centering support, and the shaft 13 is provided with a central projection of the pressure-receiving chamber forming body P. Since the movable iron core body T is slidably supported by the through holes 12A of the valve 12, the movable iron core body T is provided at a plurality of positions by the valve body 14 below the pressure receiving chamber forming body P and the shaft 13 above the pressure receiving chamber forming body P. Since the centering support is provided, the centering support of the movable iron core body T can be performed more reliably, and the obstruction of the valve portion 16 with respect to the valve seat 1 and the relative position of the movable iron core 15 with respect to the fixed iron core 9 can be more accurately arranged. Thus, the dynamic characteristics of the movable iron core 15 can be improved.

Further, as shown in FIG. 4, for centering support in the through hole 12A of the shaft 13, a pair of thin and annular flange portions 13A extending outward from the shaft 13 are provided in the vertical direction, and by this flange portion 13A. Through hole 12A
The centering support of the shaft 13 in the vicinity of the upper part and the lower part of the shaft makes it possible to enhance the reliability of the centering support of the shaft 13 (movable iron core body T) and to vertically slide the movable iron core body T by the centering support. Reduction of the dynamic resistance (sliding resistance of the shaft 13) could be achieved. This can eliminate the need to increase the size of the solenoid 7 and increase the magnetic attraction force for the movable iron core body T.

[0020]

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. A valve body having an opening toward the end; a cylindrical body made of a magnetic material, in which a fixed iron core around which a solenoid is wound is magnetically coupled and disposed. A housing body provided with a lower portion of an insertion cylinder portion to be inserted into a positioning storage hole of the main body; and a cylindrical body formed of a non-magnetic material, which is arranged on the locking step portion of the valve body and is positioned and stored. An insertion cylinder part to be inserted into the hole, a bottomed cup-shaped valve body accommodating chamber whose lower end opens toward the valve seat, and a through hole at the center of the valve body accommodating chamber that opens toward the bottom of the valve body accommodating chamber A pressure-receiving chamber forming body having; and a chassis arranged vertically through a through hole of the pressure-receiving chamber forming body. At the lower end of the valve, there is a labyrinth seal against the sliding surface of the valve body storage chamber, which can move in the valve body storage chamber and which controls the opening and closing of the valve seat, and the pressure that penetrates the front and rear surfaces of the valve body. Since the valve body having the introduction path is arranged and the movable core having the movable core facing the fixed core is arranged at the upper end of the shaft, the bellows need not be used as the pressure canceling mechanism. I was able to solve all the problems I have. That is, no expensive synthetic resin material is used and the processing time is short.
It was easy to assemble, and it was possible to reduce the cost of parts and the manufacturing cost of the fluid control valve. or,
The movable iron core body including the pressure receiving chamber forming body and the valve body is obtained by lathe processing of a metal material, and in particular does not require a portion such as a bellows which must be a synthetic resin material. Since there is no need to perform a durability test each time the temperature and pressure change, a fluid control valve with high versatility and good development efficiency can be provided. Further, since the centering support of the movable iron core is carried out by performing the labyrinth seal between the sliding surface of the valve body accommodating chamber and the valve body, a special centering member such as a leaf spring is not required, so the centering member required for the centering support is reduced. In addition, the assembly is unnecessary, which also contributes to the reduction of manufacturing cost.

Further, the effective pressure receiving area of the rear surface of the valve body 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 made substantially the same. When,
It is possible to completely cancel the pressure in the primary side flow path with respect to the valve element, and to maintain the dynamic characteristics of the movable iron core including the valve element in a good condition. This is made easier by using a tubular valve body.

Further, since the shaft constituting the movable iron core is centered and supported by the through hole penetrating the central cylindrical portion, the movable iron core is added to the centering on the sliding surface between the valve body and the valve body accommodating hole. Since the shaft is centering-supported by the through hole, the centering support of the movable core body is performed more reliably, and it is not necessary to provide a new centering support member.

Further, since the centering support of the shaft and the through hole is partially centered near the upper part and the lower part of the through hole, the centering support by the through hole is performed in addition to the centering support by the valve body. Moreover, since the centering support is partially performed by the through hole, the sliding resistance of the movable iron core body including the shaft can be reduced, and the enlargement of the solenoid can be suppressed.

Further, since the insertion cylindrical portion of the pressure receiving chamber forming body and the insertion cylindrical portion of the housing body are inserted into the positioning accommodating hole of the valve body and positioned, a positioning accommodating hole which is a single positioning hole is formed. As a reference, the pressure receiving chamber forming body and the housing body can be arranged.The fixed iron core, the through hole of the pressure receiving chamber forming body and the valve body storage chamber, the movable iron core and the movable iron core body including the valve body are completely on the same axis. With this arrangement, it was possible to improve the dynamic characteristics of the movable core body.

[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 cross-sectional view showing an assembled state of the pressure receiving chamber forming body and the movable 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 vertical cross-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 Inserting Tube 7 Solenoid 9 Fixed Iron Core 10 Inserting Tube 11 Valve Body Storage Room 11A Bottom 12A Through Hole 13 Shaft 14 Valve Body 15 Movable iron core 16 Valve part 17 Pressure introduction path 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.
A cylindrical body formed of a magnetic material is formed, and a fixed iron core 9 around which a solenoid 7 is wound is magnetically coupled and arranged in the positioning housing hole 5 of the valve body V. A housing body H provided with an insertion cylinder portion 6B to be inserted therein; a cylinder body made of a non-magnetic material, which is arranged on the locking step portion 4 of the valve body V and has a positioning storage hole 5 Toward the insertion cylinder portion 10 to be inserted therein, the valve body storage chamber 11 having a cup shape with a bottom whose lower end opens toward the valve seat 1, and the 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 which is opened; and a sliding movement of the valve body accommodating chamber 11 at a lower end of a shaft 13 which is vertically penetrated through the through hole 12A of the pressure receiving chamber forming body P. Labyrinth seal is applied to the surface 11B, and the valve body storage chamber 11
A valve unit 16 that can move inside and controls opening and closing of the valve seat 1.
And a valve element 14 having a pressure introducing passage 17 penetrating the front surface 14B and the rear surface 14A of the valve element 14, and a movable iron core 15 having a movable iron core 15 facing the fixed iron core 9 at the upper end of the shaft 13 A fluid control valve consisting of T and; and moving the movable iron core body T toward the fixed iron core 9 side in accordance with the magnetic force generated in the solenoid. 2. The valve body 1 opening to the valve body storage chamber 11.
4. The fluid control valve according to claim 1, wherein the effective pressure receiving area of the rear surface 14 </ b> A of 4 and the effective pressure receiving area of the front surface 14 </ b> B of the valve body 14 that faces the valve seat 1 and opens to the primary side flow passage 2 are 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 fluid control valve according to claim 3, wherein the centering support of the shaft 13 and the through hole 12A is partially centered and supported near the upper portion and the lower portion of the through hole 12A. 5. The fluid control valve according to claim 1, wherein the insertion cylinder portion 10 of the pressure receiving chamber forming body P and the insertion cylinder portion 6B of the housing body H are inserted into the positioning storage hole 5 of the valve body V. ..