JP2002327857A - Diaphragm valve with vibration-proof function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent noise due to repeated overshooting and undershooting in blocking a pilot hole of a diaphragm valve with a valve element fixed to a plunger in a flow passage closing operation, wherein a phenomenon (overshoot) such that a seat part of the diaphragm valve is attracted to a main valve seat by fluid flowing into a pressure chamber, before the diaphragm valve is pressed to the main valve seat, and, as a reaction thereof, is followed in a very short time by an opposite phenomenon (undershoot) where the diaphragm valve attempts to separate from the main valve seat. SOLUTION: The pilot operated pressure-receiving diaphragm valve opens and closes the main valve seat of a valve body and, in a valve closing operation, a seal plane of the seat part in the diaphragm valve and a seal plane of the main valve seat come into contact in this order to reach an opened or closed condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot valve opening pressure receiving apparatus which is installed in a fluid flow path and opens and closes a pilot hole of a diaphragm valve, thereby opening and closing a main valve seat in conjunction with the diaphragm valve. Type diaphragm valve,
The present invention relates to a diaphragm valve that suppresses generation of abnormal noise when closed.

[0002]

2. Description of the Related Art Hitherto, there has been a pilot type valve-opening pressure receiving type diaphragm valve having a structure as shown in FIG.

[0003] That is, the inlet and the inlet, the main valve seat, the outlet,
A diaphragm valve is installed on the valve body having the outflow port so as to close the main valve seat, and a diaphragm retainer is arranged on the valve body so as to press a bead portion of the diaphragm valve, and the upper part of the diaphragm retainer is provided with a diaphragm retainer. As means for closing the pilot hole of the diaphragm valve, a plunger of a magnetic member to which a valve body of an elastic member is fixed, a pole core, a spring one end of which is in contact with the pole core and presses the plunger, and these are housed. Known is a plunger guide in which a stored plunger guide, a bobbin integrally formed with the plunger guide, and a coil in which a copper wire is wound around the bobbin are installed, and the outer periphery thereof is surrounded by a yoke. Some valves are disclosed, for example, in Japanese Patent Application Laid-Open No. 10-2448. The diaphragm valve disclosed in the above publication includes a bleed hole penetrating the pressure chamber and the inflow path side, and the center projection protrudes from the center of the diaphragm valve and penetrates the pressure chamber and the outflow path side. It had a pilot hole.

[0004] The valve having this configuration is advantageous in terms of durability because the closing pressures acting on both sides of the convolution of the diaphragm valve when closed are not required, so that strength measures such as a base cloth are not required, and the diaphragm is damaged. Even if the fluid does not flow out, it is mainstream due to its fail-safe feature.

[0005] Further, in response to the problem that the bleed hole is blocked by foreign matter mixed with the fluid from the inflow passage, a pin having one end fixed to the diaphragm holder is inserted into the bleed hole, and the pin and the diaphragm valve are inserted. There is also a configuration in which the bleed holes have a self-cleaning action by relatively operating the bleed holes.

The opening operation of such a pilot type solenoid valve is performed as follows. When a current is applied to the coil, the plunger is attracted to the pole core in the plunger guide provided inside the coil, and the valve element closing the pilot hole of the diaphragm valve is separated. Then, the fluid on the inflow passage side flows from the bleed hole of the diaphragm valve into the pressure chamber in the diaphragm retainer, passes through the pilot hole of the diaphragm valve, and flows out to the main valve seat hole and the outflow passage side. When this passage is opened, the diaphragm valve floats from the main valve seat due to the pressure of the fluid on the inflow passage side, and most of the fluid flows out through the inflow passage, the main valve seat, and the outflow passage.

Next, the closing operation of the pilot type solenoid valve is performed as follows. When the current is stopped flowing through the coil, the valve body fixed to the plunger closes the pilot hole of the diaphragm valve due to the force of the spring pressing the plunger in the plunger guide installed inside the coil. I do. Then, the fluid flowing from the bleed hole of the diaphragm valve into the pressure chamber in the diaphragm holder loses its destination, and presses the diaphragm valve floating from the main valve seat against the main valve seat due to an increase in the fluid pressure. Become.

[0008]

However, the above-mentioned pilot type solenoid valve has a problem that the diaphragm valve generates abnormal noise just before closing. According to the analysis of the inventors, when the pilot hole of the diaphragm valve is closed by the valve element fixed to the plunger at the time of the flow path closing operation, the gap flow path formed by the diaphragm valve element and the main valve seat has the diaphragm valve element. By moving in the direction pressed by the main valve seat, the throttle is throttled, and the fluid flowing through this gap causes the fluid to flow into the pressure chamber and a speed higher than that of pressing the diaphragm valve to the main valve seat. The phenomenon (overshoot) in which the seat portion of the diaphragm valve is attracted to the main valve seat, and conversely, in the attracted state, the inflow of water from the small hole into the pressure chamber cannot keep up with the pressure chamber. When the fluid is not completely filled, a phenomenon (undershoot) in which the diaphragm valve tries to separate from the main valve seat occurs in a very short time as a reaction, Over door and undershoot is it has been confirmed that repeated. The cause of the abnormal noise is that the diaphragm valve vibrated due to the repetition of the overshoot and undershoot together with the influence of the vibration of the fluid when passing through the main valve seat, the vibration of the piping, etc. It was confirmed that it occurred at the moment of sitting while repeating. When abnormal noise is generated in a device using this type of valve element, for example, a low tank water supply device for flushing a flush toilet, an automatic flush valve for a toilet or urinal, or an automatic faucet, noise is a problem.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a diaphragm valve which is inexpensive and improved so as not to generate abnormal noise immediately before closing. It is something to offer.

[0010]

A first aspect of the present invention is a pilot-type valve-opening-type diaphragm valve that opens and closes a main valve seat of a valve body. It is characterized in that the main valve seat sequentially comes into contact with the sealing plane to reach an open / closed state.

According to this configuration, the seat portion of the diaphragm valve and the main valve seat are always closed gradually at the time of closing, so that the overshoot can be suppressed and the vibration of the diaphragm valve can be suppressed. An on-off valve that is inexpensive and surely does not generate abnormal noise can be configured without attaching members such as a vibration unit.

A second invention is a pilot type valve-opening pressure-receiving diaphragm valve for opening and closing a main valve seat of a valve body,
When the diaphragm valve is assembled to the valve body, the seal plane of the diaphragm valve seat and the seal plane of the main valve seat are not parallel.

According to this configuration, when the diaphragm valve is closed, the diaphragm valve is always seated from a position where the distance between the seat portion of the diaphragm valve and the main valve seat is short. Since the vibration of the diaphragm valve can be suppressed by holding down, it is possible to configure an on-off valve that is inexpensive and surely does not generate abnormal noise without newly attaching a member such as an anti-vibration unit.

A third aspect of the present invention is characterized in that the diaphragm valve is configured such that the thickness of the seat portion is changed in the diametrical direction so that the sealing plane of the seat portion is inclined.

According to this configuration, it is possible to construct an on-off valve that does not generate abnormal noise as described above.

According to a fourth aspect of the present invention, the diaphragm valve is characterized in that the height of the main valve seat is changed in a diametrical direction so that the sealing surface of the main valve seat is inclined.

According to this configuration, it is possible to configure an on-off valve that does not generate abnormal noise as described above.

The fifth invention is characterized in that a pin not fixed to the bleed hole is inserted.

According to this configuration, clogging of the bleed hole can be prevented without interfering with the operation of the diaphragm valve, and a more reliable diaphragm valve can be supplied.

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to make the contents of the present invention easier to understand, the following description will be made based on the illustrated embodiment.

[0020]

FIG. 1 shows an embodiment of a conventional general pilot type solenoid valve. FIG. 2 shows an embodiment of the pilot type solenoid valve of the present invention. FIG. 3 shows a closed state of the pilot type solenoid valve of the present invention. FIG. 4 shows an embodiment of a pilot type solenoid valve in the case where the main valve seat is inclined in the present invention. FIG. 5 shows an embodiment in which a pin for preventing bleed hole clogging is inserted in the present invention.

First, the embodiment shown in FIG. 2 will be described. FIG.
1 is a longitudinal sectional view showing a closed state of a pilot type solenoid valve 10 equipped with a diaphragm valve 20 of the present invention. The main valve seat 15 is closed by a valve body 17 having an inflow port 11, an inflow path 12, an outflow path 14, a main valve seat 15 provided at an end face of the outflow path 14, and an outflow port 16. A diaphragm valve 20 that can be displaced by the flowing fluid pressure is installed, and a diaphragm retainer 40 is pressed against the valve body 17 so as to press a bead portion 30a of the diaphragm 30 of the diaphragm valve 20, and on the upper part of the diaphragm retainer 40, A plunger 42 to which a valve element 41 is fixed so as to close the pilot hole 27 of the diaphragm valve 20;
, A bobbin 45 formed integrally with a plunger guide 44 containing a pole core 48,
A coil 47 that winds a copper wire around a cylindrical bobbin 45 is arranged, and the coil 47 has a cylindrical shape.
The opening is housed in a yoke 49 having a flange portion 49a, and the yoke 49 has the flange portion 49a fixed to the valve main body 17 by a mounting screw or the like. In this state, the diaphragm valve 20 is seated on the main valve 15 in an inclined state.

FIG. 3 is an enlarged sectional view showing the open state of the diaphragm valve 20 of the present invention. The diaphragm receiver 21 has a cone 25 having an outlet 28 at the center, a pilot hole 27 at the center projection 26 on the back side, a bleed hole 24 at the outer periphery, and a diaphragm 30 having a seat 33. Has a small hole 31 corresponding to the bleed hole 24.
A central hole 32 is provided at the center portion, and the cone portion 25 is engaged with the diaphragm inner hole 32 by being inserted so that the diaphragm receiver 21 and the diaphragm 30 are tightly coupled to each other. The seat section 33 has an inclined high section 3
The inclination is given by changing the thickness of the sheet portion in the diameter direction from 3a to the inclined lower portion 33b. In this state, the diaphragm valve 33 is seated on the main valve 15 in an inclined state. When shifting from this state to the closed state, the seat portion, which is indicated by a two-dot chain line in the drawing, comes into contact with the main valve seat 15 from the high inclined side 33a, and then the low inclined side 33b contacts the main valve seat 15.

FIG. 4 shows a main valve seat 15 according to an embodiment of the present invention.
FIG. 7 is a diagram illustrating an example in which a tilt is provided to the first embodiment. In this embodiment, the seat portion 33 of the diaphragm valve 30 is not inclined, and the height of the main valve seat is inclined in the diameter direction from the main valve seat high portion 15a to the main valve seat low portion 15b.
When shifting from this state to the closed state, the seat portion 33 indicated by the two-dot chain line once abuts on the main valve seat high side 15a, and thereafter abuts on the main valve seat low side 15b.

In the on-off valve configured as described above, the bleed hole 24 is provided to prevent the bleed hole 24 from being clogged.
Pin 34 smaller than the diameter of the bleed hole 24,
In order to prevent a problem caused by foreign matter being caught in the bleed hole 24 by relatively operating the diaphragm valve 30 and the pin 32, the diaphragm valve 30 is inclined by the inclination provided by the seat portion 33 in the closed state. In some cases, friction with the C.34 occurred, resulting in poor operation.

Therefore, in this embodiment, as shown in FIG. 5, the pin to be inserted into the bleed hole 24 is
Instead of being fixed to the like, a pin having a shape that is prevented from coming off by caulking both ends is inserted into the bleed hole 24 so as to have a self-cleaning action and not affect the operation even if the diaphragm valve 30 is tilted at the time of closing.

This prevents the bleed hole 24 from being clogged with foreign matter and causing a malfunction, while preventing the diaphragm valve 30 from vibrating.

Note that the above-mentioned contents relate only to the embodiments of the present invention and modifications thereof,
It does not mean that the present invention is limited only to the above contents. The devices according to the above embodiments and their modifications are applicable to various uses other than the pilot type solenoid valve (for example, a pressure chamber type ball tap for flush toilets).

【The invention's effect】

As described above, according to the present invention, it is possible to provide an on-off valve which is inexpensive and surely does not generate abnormal noise.

[Brief description of the drawings]

FIG. 1 is an embodiment of a conventional general pilot type solenoid valve.

FIG. 2 is an embodiment of a pilot type solenoid valve of the present invention.

FIG. 3 shows a closed state of the pilot type solenoid valve of the present invention.

FIG. 4 is an embodiment of a pilot type solenoid valve in the case where the main valve seat side is inclined in the present invention.

FIG. 5 shows an embodiment in which a pin for preventing bleed hole clogging is inserted in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Electromagnetic valve 11 ... Inflow port 12 ... Inflow path 14 ... Outflow path 15 ... Main valve seat 15a ... Main valve seat inclination high part 15b ... Main valve seat inclination low part 16 ... Outflow 17 ... Valve main body 20 ... Diaphragm valve 21 ... diaphragm receiver 24 ... bleed hole 25 ... cone part 26 ... center projection 27 ... pilot hole 28 ... pilot outflow hole 30 ... diaphragm 30a ... bead part 31 ... diaphragm small hole 32 ... diaphragm middle hole 33 ... diaphragm sheet part 33a ... sheet part Inclined high portion 33b Seat portion Inclined low portion 34 Pin 40 Diaphragm holding 41 Valve body 42 Plunger 43 Spring 44 Plunger guide 45 Bobbin 47 Copper wire 48 Pole core 49 Yoke 49a Flange

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Taisuke Toyosaka 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka Tochiki Kiki Co., Ltd. No. 1-1 Toto Kiki Co., Ltd. (72) Nobunaga Matsufuji 2-1-1 Nakajima, Kokurakita-ku, Kitakyushu-shi, Fukuoka F-term within Toto Kiki Co., Ltd. 3H056 AA02 BB04 BB49 CA07 CB03 CB08 CC02 CC12 CD01 DD02 DD06 GG04 GG05 3H066 AA01 BA32 EA01 EA36

Claims (5)

[Claims] 1. A pilot type valve receiving pressure-type diaphragm valve for opening and closing a main valve seat of a valve body, wherein a sealing plane of the diaphragm valve seat portion and a sealing plane of the main valve seat are sequentially arranged during a valve closing operation. A diaphragm valve that comes into contact with and opens and closes. 2. The diaphragm valve according to claim 1, wherein
A diaphragm valve, wherein a seal plane of a diaphragm valve seat and a seal plane of a main valve seat are not parallel to each other when a diaphragm valve is assembled to the valve body. 3. The diaphragm valve according to claim 2, wherein a thickness of the seat portion is changed in a diametric direction so that a sealing plane of the seat portion is inclined. 4. The diaphragm valve according to claim 2, wherein the height of the main valve seat is changed in a diametrical direction so that a sealing surface of the main valve seat is inclined. . 5. The diaphragm valve according to claim 1, wherein the diaphragm valve has a non-fixed pin inserted into a bleed hole of the diaphragm valve.