TW201416588A - Normally-closed three-way valve - Google Patents

Abstract

The present invention provides a normally closed three-way valve, wherein the valve members are formed into a combination structure of parts that can be manufactured by easily molded and assembled products, thereby to reduce the manufacturing costs. A normally closed three-way valve comprises a main valve seat (2) disposed with respect to the inside of valve body (1), valve members (3) bounced from the supply port (P) side toward the valve-closing direction by a rod (5) provided with a discharge flow path (6) to proceed opening, a back pressure chamber (8) constituting the back of the valve member is communicated with the flow path of the output port (A) side from the vent hole (9), thereby to balance the fluid pressure acting on the rear surfaces of the valve members. In said normally closed three-way valve, the aforementioned valve members are constituted by: a valve member body (31); a seat member (32) made with disk-shaped sealing material having rubber elasticity, and provided with a main seat surface (32a), an exhaust seat surface (32b), and a through hole (32c) having an opening between the main seat surface (32a) and the exhaust seat surface (32b) as a vent hole (9); a fixing member (33) for fixing the seat member to the valve member body; and buckle pressing frame (34) surrounding the seat member, in addition, the constituting parts of the valve members are formed by molded products.

Description

Normally closed three-way valve

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a normally closed three-way valve, and more particularly to an improvement of a normally closed three-way valve having a balance mechanism capable of reducing a valve member required to close a valve at a valve opening position.

Conventionally, a normally closed three-way valve including the above-described balance mechanism is known to have a valve body having the same basic configuration as that of the three-way valve according to the present invention, and is configured to press a valve member for operating a valve member to open a valve. The fluid pressure flowing out to the output helium side acts on the valve member to act as a back pressure for closing the valve.

In the normally closed three-way valve, when the balance mechanism is not provided, the fluid pressure flowing out to the output side when the valve member is pushed by the rod to open the valve acts on the valve member to maintain the valve member. The force in the direction of the valve opening position, therefore, even if the pressing force required to open the valve for opening the valve disappears, if the valve member does not act, it is necessary to prevent the fluid pressure flowing out to the output port side from closing. When the force of the valve is applied, the valve is not closed, so that it is necessary to provide a valve closing force by a return spring for the valve member or a mechanism for forcibly closing the valve. Then, when the valve closing force is applied to the valve member by the return spring, it is necessary to open the valve against the spring force of the return spring and the pressure of the main fluid when the valve is opened, so that it is necessary to apply a strong operation to the rod in order to open the valve. force.

In order to reduce the above-mentioned operating force required for opening the valve, the balancing mechanism is configured to be capable of outputting the main side of the output when the valve member is in the valve open position. The fluid pressure flows into the back pressure chamber formed at the back of the valve member through the vent hole provided in the valve member, so that when the valve is opened, it is necessary to close the discharge flow path to the outside through the opening in the rod, and open with the valve member In addition, it is necessary to maintain the vent hole of the valve member which can flow the pressure of the main fluid on the output dam side to the valve member of the back pressure chamber to be open to the output dam side. The valve closing of the three-way valve is usually performed by a return spring to which a small elastic force is applied to the valve member, that is, the discharge flow to the outside through the opening of the rod is opened while releasing the pressing of the rod to the valve member. The road is thereby closed.

Thus, the known normally closed three-way valve employs the valve member 40 constructed as shown in Fig. 8. The valve member 40 is attached and used to the valve body 1 having substantially the same configuration as the normally closed three-way valve of the first embodiment, and is configured to be kept airtight in opposition to the main valve seat 2 of the valve body 1. The valve member body 41 slidably movable in the direction of separation is provided with a main seat surface 44 to be separated from the main valve seat 2 of the valve body 1 and an exhaust flow path 6 in the rod 5 for opening the valve The inner end is crimped to close the exhaust seat surface 45 of the exhaust flow path 6, but the exhaust seat surface 45 is preferably disposed at a position very close to the periphery of the main seating surface 44, however, the above two Further, between the seat surfaces, there is a need to open a vent hole to be communicated with the back pressure chamber 8, so that the main seat surface 44 and the exhaust seat surface 45 cannot be disposed on the same plane, and thus, the valve member body 41 is provided. The upper portion is provided with a step 42, the main seating surface 44 is disposed in the lower portion, and the exhaust seating surface 45 is disposed in the lower portion, whereby a vent hole can be opened in a portion of the step 42 to be configured by the two seating surfaces 44. 45 performs stable fluid circulation and blockage.

However, when the above configuration is employed, when the valve member 40 is manufactured, The main seat surface 44 and the exhaust seat surface 45 are formed by separate seats, so that it is difficult to stably fix the valve member body 41 individually. Based on this, the valve member body 41 has a rubber-elastic seat material. An integral seat member 43 spanning the lower portion of the step 42 is provided for a single lining rubber. Further, in order to open the vent hole at the side portion of the step 42, it is necessary to pass through the lower surface of the valve member body 41. There is a vent hole 46 that does not reach the upper surface and a branching through hole 47 that has an upper portion that is open at the side. Therefore, the valve member body 41 is difficult to manufacture by a molded product, and the rubber lining structure of the seat member 43 and the above-described venting The formation of the air holes 46 and the branching through holes 47 must be formed by cutting of a metal material. Further, the valve member body 41 is required to be provided with a separate rubber, which results in a relatively high cost of manufacturing the valve member. .

A technical problem of the present invention is to provide a normally closed three-way valve in which a valve member is formed into a joint structure of a member that can be manufactured by a molded article that can be easily molded and assembled, thereby reducing the manufacturing cost of the valve member.

In order to solve the above problems, according to the present invention, it is possible to provide a normally closed type three-way valve which is configured as follows, that is, the normally closed type three-way valve is provided between the supply port and the output port of the valve body. The main valve seat is provided, and the valve member is pushed from the return side by the return spring to the valve closing direction. A valve for opening the valve member that opens the valve member is provided with a discharge passage that is closed by abutting against the exhaust seat surface of the valve member. The valve member is provided with a vent hole that allows the back pressure chamber formed at the back of the valve member to communicate with the main fluid flow path on the output dam side when the valve member is in the valve open position, thereby being configured to have a function on the valve The balance mechanism of the fluid pressure balance on the back surface of the member, wherein the valve member is held by sliding the main valve seat in the direction of the separation, for example, in the normally closed three-way valve a valve member body having a through hole for forming the vent hole; a disk-shaped sealing material having rubber elasticity; and abutting against a facing surface of the main valve seat of the valve member body, facing the main valve seat a main seat surface is formed in the portion, and an exhaust seat surface is formed at a portion facing the end surface of the discharge flow path of the valve for opening the valve, and a through hole is provided to open the through hole of the valve member body. a structure between the above-mentioned exhaust seat surface and the exhaust seat surface Airtightly embedded in the central portion of the seat member to lock the front end to the valve member body, thereby fixing the seat member to the fixing member of the valve member body; and retaining the periphery of the seat member on the valve member body The upper crimping frame is constructed, and each of the components for constituting the valve member is formed of a molded product.

In a preferred embodiment of the normally closed three-way valve according to the present invention, the pressing frame for holding the periphery of the seat member on the valve member body is configured to be provided with a periphery of the seat member. The locking member is clamped between the locking member and the periphery of the valve member body, and the lower portion of the peripheral portion of the pressing frame that abuts against the periphery of the valve member body is fixed to the valve member body by welding or adhesive bonding.

Further, in another preferred embodiment of the present invention, the front end of the valve for opening the valve member to which the valve member is required to have a valve opening operation force may be configured to protrude from the valve body to the outside to make the rod outer The end becomes the abutment end of the valve operating mechanism to be mechanically abutted.

Further, in a preferred embodiment of the present invention, the main valve seat facing surface of the valve member main body is formed with a corresponding passage between the main seating surface and the exhaust seat surface of the seat member of the valve member. a hole communicating with the through hole of the valve member body, or a main seat surface and a discharge seat surface of the seat member to be inserted into the valve member body on the opposite surface of the main valve seat of the valve member body The correspondingly disposed through holes thereby position the seat member and suppress the protrusions whose deformation of the through hole is narrowed.

According to the normally-closed three-way valve of the present invention described in detail above, it is possible to provide a joint structure in which a valve member is formed to have a molded article which can be easily molded and assembled, thereby manufacturing the valve member. A normally closed three-way valve with reduced cost.

[Embodiment of the Invention]

Fig. 1 shows an example of the practice of the normally closed three-way valve according to the present invention. The normally closed three-way valve is provided to face the main valve seat 2 between the supply port P and the output port A provided in the valve body 1, and is urged from the supply port P by the return spring 4 to the valve closing direction. Valve member 3. In addition, by the valve The valve opening 5 for opening the valve to open the main valve seat 2 is provided with an exhaust flow path 6 that is closed by abutment against the valve member 3, and is formed to be borrowed. The exhaust flow path 6 can be opened and closed by the seat member 32 on the valve member 3 to be connected from the inner end. Further, the valve member 3 is provided with a vent hole 9 through which the back pressure chamber 8 formed at the rear side thereof communicates with the main fluid flow path of the output dam side A when the valve member is at the valve open position, whereby It is configured as a balance mechanism that can balance the fluid pressure acting on the front and back surfaces of the valve member 3.

Further, the vent hole 9 is a flow path in which the back pressure chamber 8 is always connected to the main fluid on the output dam side A. However, when the valve is closed at the time shown in Fig. 1, the flow path on the 埠A side is opened to the atmosphere, so the back is opened. Pressurized air is not introduced into the pressure chamber 8.

The valve member 3 is disposed at a position facing the main valve seat 2 so as to be slidable in a direction in which the main valve seat 2 is to be detached. However, the valve member 3 is held by the following configuration. In other words, the holding member 12 that elastically locks the claw portion 12a is engaged with the inner surface of the valve hole 10 provided in the valve body 1, whereby the cylinder portion 12b in the holding member 12 is interposed with the sealing member 13 The valve member 3 is inserted so as to be slidable in a direction in which the main valve seat 2 is to be detached, so that the back pressure chamber 8 is formed behind the valve member 3 in the cylinder portion 12b.

Further, the valve member 3 does not have to be held by the holding member 12 described above, and may be disposed on the valve body 1 or the like to be slidable relative to the main valve seat 2 in the supply port 埠P of the main valve seat 2 described above. Free to pick up the direction.

Further, the above-mentioned valve 5 for opening the valve is kept in the valve body 1 to be slippery. The exhaust gas flow path 6 is provided in the axial direction of the valve member 3 as described above, and the end surface 5a on the valve member 3 side is formed as an exhaust valve portion, and is configured to abut against the valve member 3 The seat member 32 closes the exhaust flow path 6 and the other end thereof protrudes from the valve body 1 to the outside, and the outer end is used as a contact end 5b of a suitable operating element of the valve operating mechanism to be mechanically abutted, The outer end of the exhaust gas flow path 6 is opened at the side of the rod 5 as an exhaust port R on a portion protruding from the valve body 1 to the outside. Further, the outer end of the rod 5 is operated by an actuator configured by an appropriate valve operating mechanism.

The holding of the rod 5 held by the valve body 1 is performed by engaging the inner surface of the rod holding hole 14 provided in the valve body 1 to elastically lock and fix the claw portion 15a. The rod 5 is slidably inserted into the inner cylindrical portion 15b of the rod holding member 15, and then the rod 5 is closed to be airtight in order to close the rod holding hole 14 of the flow path on the input 埠A side. Between the valve body 1 and the valve body 1, the sealing members 16, 17 held by the rod holding member 15 are sealed. Further, between the spring retainer portion 5c formed on the outer periphery of the rod 5 and the inner surface of the valve body 1, a return spring 18 for the rod is retracted.

Next, the configuration of the valve member 3 will be described in detail with reference to FIGS. 1 to 4 .

First, the valve member 3 is held by a valve member body 31 that is held in a direction in which the main valve seat 2 is slid in a direction in which it is separated from the main valve seat 2, and has a through hole 31a for forming the vent hole 9 therein; The rubber-elastic disc-shaped sealing material is formed to abut against the seat member 32 held by the main valve seat opposing surface 31b of the valve member body 31; airtightly fitted in the central portion of the seat member 32 to lock the front end portion Through hole 31a of valve member body 31 Thereby, the seat member 32 is fixed to the fixing member 33 of the valve member body 31; and the pressing frame 34 which can hold the periphery of the seat member 32 on the valve member body 31 is formed.

The valve member main body 31, the fixing member 33, and the crimping frame 34, which are components for the valve member 3, are formed of a molded product of metal or synthetic resin, and the seat member 32 is formed of a rubber-elastic sealing material. Since it is a disk shape, since it is not necessary to process each part after shaping|molding, it can shape|mold it cheaply compared with the form of the shaping|molding of these shaping|molding, and the above-mentioned each component. It is clear that the assembly of the various components can also be performed mechanically, so that the manufacturing cost can also be reduced.

More specifically, when the valve member 3 is configured, the seat member 32 having a disk shape is formed such that a main seating surface 32a that is separated from the main valve seat 2 is formed at a portion facing the main valve seat 2 The exhaust seat surface 32b that the end surface 5a is separated from is formed at a portion facing the end surface 5a of the discharge flow path 6 of the valve opening 5, and the valve member body 31 is provided. The through hole 31a opens through the through hole 32c between the main seating surface 32a and the exhaust seating surface 32b, and the through hole 32c is located at the end surface 5a of the discharge valve 6 of the concentric circular main valve seat 2 and the rod 5. Between them, it is formed into a circular arc shape in plan view.

The seat member 32 is abutted and fixed to the main valve seat facing surface 31b of the valve member body 31, but the main seat opposing surface 31b of the valve member body 31 is provided with the main body inserted into the seat member 32. A correspondingly disposed through hole 32c between the seat surface 32a and the exhaust seat surface 32b thereby causes the seat member 32 The protrusion 31c in which the through hole 32c is deformed and narrowed is positioned and suppressed. The above-mentioned projection 31c has the same planar circular arc shape as the through hole 32c of the seat member 32. However, the projection 31c is preferably in the form of a shape in which the outer surfaces of the projections 31c are formed as a through hole. The circular arc surface 31d on the outer peripheral surface of the inner surface of the 32c can stably position the seat member 32, and the inner wall surface of the projection 31c can be formed on the inner side surface side of the projection 31c. A convex portion 31e is formed between the gaps.

Further, a groove 31f for allowing the through hole 32c to communicate with the through hole 31a is formed in the main valve seat facing surface 31b of the valve member body 31.

The seat member 32 abuts against the main valve seat facing surface 31b of the valve member body 31 as described above, and is formed in a conical hole 32d provided at a central portion thereof so as to have a small diameter on the side of the valve member body 31 thereof. The fixing member 33 having the substantially identical head portion is fitted so that the front end side hook portion 33a is press-fitted into the through hole 31a of the valve member body 31, whereby the central portion of the seat member 32 is fixed to the valve member body 31. .

Further, the pressing frame 34 for holding the periphery of the seat member 32 on the valve member body 31 is provided to be locked around the seat member 32, whereby the seat member 32 is sandwiched between the seat member 32 and the valve member body 31. The peripheral edge portion 34b of the crimping frame 34 to be abutted on the periphery of the valve member body 31 is fixed to the peripheral edge of the valve member body 31 by welding or adhesion.

On the other hand, in the fifth to seventh embodiments, another configuration example of the valve member 3 is disclosed. This configuration example is omitted from the main valve seat of the valve member body 31 as compared with the first to fourth figures. The protrusion 31c of the facing surface 31b, and will A groove 31f through which the through hole 32c provided between the main seating surface 32a and the exhaust seating surface 32b of the seat member 32 communicates with the through hole 31a of the valve member body is formed in the valve body member body 31.

In this form, the fixing of the fixing member 33 and the pressing frame 34 when the seat member 32 is fixed to the valve member main body 31 can be more reliably performed.

In addition, the other configurations and operations of the configuration example are not different from those of the valve members described with reference to FIGS. 1 to 4, and therefore, the description of the main portions will be omitted.

In the normally closed three-way valve having the above configuration, when the front end of the rod 5 is pressed to open the valve, the end surface 5a of the exhaust flow path 6 of the rod 5 is pressed against the exhaust seat surface of the valve member 3. 32b, the discharge flow path 6 in the rod is closed, and the valve member 3 is pressed against the spring force of the valve member return spring 4 by the rod 5, thereby opening the valve seat. As a result, the pressurized air flows from the supply port P to the output port A. Further, when the valve is opened, the back pressure chamber 8 formed behind the valve member 3 is introduced through the vent hole 9 provided in the valve member 3. The fluid pressure on the side of the output port A is balanced so that the fluid pressure acting on the front and back surfaces of the valve member 3 is balanced. Further, as long as the inner end surface 5a of the rod 5 is pressed against the exhaust seat portion of the valve member 3, the discharge passage 6 which is opened outside the rod 5 is closed.

When the pressing force required to open the valve of the lever 5 disappears, the spring force of the lever return spring 18 causes the lever 5 to be reset, and the fluid pressure acting on the front and back surfaces of the valve member 3 is balanced as described above. The valve member 3 can be reset by the small spring force of the return spring 4 for the valve member, and the spring force of the return spring 4 for the valve member can be made small even if it is formed. The main seating surface 32a of 3 abuts against the main valve seat to close the main valve seat 2. The pressing force at the time of opening the valve by the lever 5 is required to be able to counteract the spring force of the return spring 18 for the lever and the return spring 4 for the valve member.

When the pressing force required to open the valve of the lever 5 disappears, the lever 5 is pushed back to the original closed position by the spring thrust of the return spring 18, so that the end face 5a of the lever 5 leaves the valve member 3. The exhaust seat surface 32b allows the pressurized air on the output 埠A side to be discharged from the front end of the rod 5 through the discharge flow path 6 in the rod 5. At the same time, the fluid pressure that has flowed into the back pressure chamber 8 formed behind the valve member 3 is also discharged from the vent hole 9 of the valve member 3 to the outside through the discharge flow path 6 in the rod 5, and the back pressure chamber 8 is placed therein. Will become atmospheric pressure.

1‧‧‧ valve body

2‧‧‧Main seat

3‧‧‧Valve components

4‧‧‧Return spring

5‧‧‧ pole

6‧‧‧Exhaust flow path

8‧‧‧ Back pressure chamber

9‧‧‧Ventinel

31‧‧‧ valve component body

31a‧‧‧through hole

31b‧‧‧Main valve seat facing surface

32‧‧‧seat components

32a‧‧‧Main seating

32b‧‧‧Exhaust seat

32c‧‧‧through hole

33‧‧‧Fixed components

34‧‧‧clamping frame

P‧‧‧Supply

A‧‧‧output埠

R‧‧‧Exhaust gas

Fig. 1 is a longitudinal sectional view showing an embodiment of a normally closed three-way valve according to the present invention.

Fig. 2 is a plan view showing the valve member of the normally closed three-way valve.

Fig. 3 is a cross-sectional view showing the valve member in the A-A position shown in Fig. 2.

Fig. 4 is an exploded perspective view of the valve member shown in Fig. 2.

Fig. 5 is a plan view showing a modification of the valve member.

Fig. 6 is a cross-sectional view showing the position of the valve member shown in Fig. 5 at the B-B position.

Fig. 7 is a perspective view of the valve member body of the valve member shown in Fig. 5.

Fig. 8 is a cross-sectional view showing a conventional valve member using the same type of valve body as the valve body of the normally closed three-way valve of the present invention.

1‧‧‧ valve body

2‧‧‧Main seat

3‧‧‧Valve components

4‧‧‧Return spring

5‧‧‧ pole

5a‧‧‧ end face

5b‧‧‧Abutment

5c‧‧‧Spring Seat Department

6‧‧‧Exhaust flow path

8‧‧‧ Back pressure chamber

9‧‧‧Ventinel

10‧‧‧ valve hole

12‧‧‧ Keeping components

12a‧‧‧ claws

12b‧‧‧Cylinder department

13‧‧‧ Sealing members

14‧‧‧ pole retention hole

15‧‧‧ rod retaining members

15a‧‧‧ claws

15b‧‧‧Inside cylindrical part

16‧‧‧ Sealing members

17‧‧‧ Sealing members

18‧‧‧Return spring for rod

31‧‧‧ valve component body

32‧‧‧seat components

32a‧‧‧Main seating

32b‧‧‧Exhaust seat

32c‧‧‧through hole

33‧‧‧Fixed components

34‧‧‧clamping frame

P‧‧‧Supply

A‧‧‧output埠

R‧‧‧Exhaust gas

Claims (5)

A normally closed three-way valve having a main valve seat disposed between a supply port and an output port in a valve body, and a valve member pushed from a return spring to a valve closing direction from the supply port side by Providing a valve opening operation force to the valve member, a valve for opening the valve for opening the main valve seat is provided with a discharge flow path that is closed by abutting against the exhaust seat surface of the valve member. The valve member is provided with a vent hole that allows the back pressure chamber formed at the back thereof to communicate with the main fluid flow path on the output dam side when the valve member is in the valve open position, thereby being configured to have a function on the valve member The balance mechanism of the fluid pressure balance on the back surface of the watch is characterized in that the valve member is held slidably in the direction in which the main valve seat is detached from the main valve seat, and a through hole for forming the vent hole is provided therein. a valve member body formed of a disc-shaped sealing material having rubber elasticity, abutting against a facing surface of the main valve seat of the valve member body, a main seating surface being formed at a portion facing the main valve seat, and opening the valve The end face of the discharge flow path of the rod a portion having a venting seat surface, and a through hole for opening a through hole of the valve member body between the exhaust seat surface and the exhaust seat surface; airtightly embedded in the seat a central portion of the member is configured such that the front end is locked to the valve member body, thereby fixing the seat member to the fixing member of the valve member body; and a crimping frame that can hold the periphery of the seat member on the valve member body, Further, each of the components for constituting the valve member is formed of a molded article. The normally closed three-way valve according to claim 1, wherein the periphery of the seat member is held by the valve member body. The frame is configured to include a locking edge portion that can be clamped between the seat member and the periphery of the valve member body, and a lower portion of the periphery of the buckle frame that abuts against the periphery of the valve member body is The valve member body is fixed by welding or bonding. The normally closed three-way valve according to the first or second aspect of the invention, wherein the front end of the valve for opening the valve to which the valve opening operation force is applied to the valve member is configured to protrude from the valve body to Externally, the outer end of the rod is abutting end of the valve operating mechanism that can be mechanically abutted. The normally-closed three-way valve according to any one of the first to third aspects of the present invention, wherein the main seat of the valve member body faces the opposing surface, and a seat for a seat member of the valve member is formed. A through hole correspondingly disposed between the surface and the exhaust seat surface communicates with the groove of the through hole of the valve member body. The normally-closed three-way valve according to any one of the first to fourth aspects of the present invention, wherein a main seat of the valve member body is provided with a seat member that is inserted into a seat member of the valve member. A correspondingly disposed through hole between the face and the exhaust seat surface thereby positions the seat member and suppresses the protrusion of the through hole from being narrowed.