JPH0718505B2 - Pilot valve - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pilot valve, and more particularly to a pilot valve capable of reducing water hammer.

(Prior Art) Conventionally, in a pilot valve that selectively controls the flow of fluid by opening and closing the valve, water hammer pressure is generated in the back pressure portion when the valve is closed, and the water hammer pressure causes vibration of the liquid supply pipe, etc. , A phenomenon called water hammer occurs. This water hammer has a problem in that it not only causes a failure of pipes, instruments, control devices, etc., but also causes noise in an apartment house. Therefore, conventionally, a method for suppressing this water hammer has been developed. As one example, there is a technique disclosed in Japanese Patent Laid-Open No. 60-132186. In this structure, the extraction hole of the diaphragm plate and the extraction hole of the diaphragm are provided at different positions, and the depressurizing flow path that connects the extraction hole and the extraction hole is provided in the flat surface portion between the diaphragm and the diaphragm plate. . As a result, the flow resistance of the liquid can be increased at the bent portion formed at the portion where the extraction hole and the depressurizing flow path and the depressurizing flow path and the extraction hole are connected. The length of the passage is increased so that the flow resistance of the passing liquid can be further increased.

(Problems to be Solved by the Invention) However, the above water hammer suppression system has the following problems. The energy-reducing flow path is formed by closing an arc-shaped groove formed in a diaphragm plate made of a rigid body with a diaphragm made of a soft elastic material such as rubber. For this reason, when the pressure of the liquid in the pilot valve increases or when the pressure of the liquid changes in an oscillating manner, the diaphragm is elastically deformed by the liquid pressure or resonance and peeling occurs between the diaphragm plate and the diaphragm. As a result, there is a possibility that the depressurizing flow path formed between the diaphragm plate and the diaphragm expands, the flow resistance decreases, and the effect of suppressing the water hammer of the depressurizing flow path at the time of design cannot be obtained.

Therefore, an object of the present invention is to provide a pilot valve having a sufficient water hammer suppression effect.

(Means for Solving the Problems) In order to solve the above problems, the present invention has the following configuration.

That is, the valve chamber is formed of a flexible material, and the valve chamber is divided into a liquid supply portion and a back pressure portion, a valve seat provided in the drainage portion is opened and closed, and the edge portion penetrates the front and back sides. A diaphragm having a through hole and a center hole at the center, and a diaphragm formed of a material having rigidity, are fixed to the back pressure side of the diaphragm, and are attached to the center hole of the diaphragm. A through hole that connects the back pressure part and the drainage part and is opened and closed by a plunger of an electromagnetic solenoid from the back pressure part side is provided in the central protruding part to be fitted, and a position different from the through hole in the edge part. A diaphragm plate having an extraction hole penetrating the front and back sides of the diaphragm plate, and a diaphragm plate formed of a material having rigidity. The diaphragm plate is provided between the diaphragm plate and the diaphragm plate. Fit in the center A plate body having a drawing portion having a drawing hole penetrating through the front and the back, and a damping force formed between the plate body and the diaphragm plate and connecting the drawing hole and the extraction hole. A flow path and a de-energizing unit that is located in the middle of the de-energizing flow path and is integrally formed with the plate body or the diaphragm plate, and that changes the cross-sectional shape of the de-energizing flow path. .

(Operation) The operation will be described with reference to FIGS. 2, 3, and 4.

The liquid that has entered from the extraction hole 24 of the plate body 18 is in the throttling portion 28, which is a deenergizing means located in the middle of the deenergizing flow path 26 formed between the plate body 18 and the diaphragm plate 32. The energy of the liquid is consumed, the rapid increase of the pressure in the back pressure portion 58 is suppressed, and the seating of the diaphragm 12 on the valve seat 54 is delayed, so that the water hammer can be suppressed. Further, since the depressurizing flow path 26 is formed between the plate body 18 and the diaphragm plate 32, and the narrowed portions 28 ... Are integrally formed with the plate body 18 or the diaphragm plate 32, the diaphragm 12 is deformed. There is no effect, the damping effect can always be exerted, and the above water hammer can be reliably suppressed.

(Embodiment) A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a plan view of a diaphragm plate, FIG. 2 is a plan view of a flow path plate as a plate body, and FIG. 3 is a cross-sectional view showing a state in which the diaphragm, the flow path plate and the diaphragm plate are assembled into a valve body, FIG. 4 is a sectional view of a pilot valve using the valve body shown in FIG.

First, the configuration will be described with reference to FIGS.

A diaphragm 12 is made of a flexible material such as rubber. A center hole 14 is provided at the center so that a diaphragm plate described later can be fitted therein. Also the diaphragm
A through hole 16 is also provided at the edge of 12 so that a drawing-in portion of a flow path plate described later can be fitted therein.

Reference numeral 18 denotes a flow path plate as a plate, and a drawing-out portion 20 is provided on the bottom surface so as to project, and the drawing-out portion 20 is fitted into the through hole 16 of the diaphragm 12 and is prevented from coming off by the flange portion 22. . A drawing hole 24 is formed in the drawing section 20. Also, the flow path plate 18
A depressurizing flow path 26 is engraved on the flat surface of the upper surface of the depressurizing flow path 26, and a plurality of throttle parts 28 ... Therefore, the flow passage cross-sectional area in the de-energizing flow passage 26 changes rapidly. The upper end of the extraction hole 24 is open in the energy-reducing flow path 26. In addition, a fitting projection 30 for positioning is provided on the upper surface of the flow path plate 18 to serve as a positioning index when it is assembled to a diaphragm plate described later.

Reference numeral 32 denotes a diaphragm plate, and the flow path plate 18 is sandwiched between the diaphragm 12 and the diaphragm 12. The lower portion of the central protrusion 34 of the diaphragm plate 32 is fitted into the central hole 14 of the diaphragm 12,
It is prevented from coming off by the flange portion 36. A through hole 38 for allowing a liquid to pass therethrough is provided at the center of the central protrusion 34. Further, an extraction hole 40 is provided at the edge of the diaphragm plate 32. The extraction hole 40 is transparently provided at a position corresponding to the depressurization flow path 26 of the sandwiched flow path plate 18, and the extraction hole 40 and the extraction hole 24 are connected to each other through the deactivation flow path 26. There is. The diaphragm plate 32 is provided with a through hole 42 that can be fitted with the fitting protrusion 30 that is provided on the upper surface of the flow path plate 18, and is compatible with the flow path plate 18 by fitting them together. Diaphragm plate 32
It enables accurate positioning of. This diaphragm 12,
The flow path plate 18 and the diaphragm plate 32 are assembled into a valve body 44 as shown in FIG. 3 to form a depressurizing flow path 26 between the flow path plate 18 and the diaphragm plate 32 in the pipeline. .
The pilot valve 10 in which the assembled valve element 44 is arranged in the valve chamber 60 will be described.

The state shown in FIG. 4 is a state in which the electromagnetic coil 46 is not energized, and the plunger 48 presses the center of the diaphragm plate 32 by the lower end surface by the biasing force of the coil spring 50 and closes the through hole 38. Further coil spring 50
Due to the pressing force of the
Since the liquid is not discharged, the liquid supplied into the liquid supply part 56 reaches the back pressure part 58 through the extraction hole 24, the depressurizing flow path 26 and the extraction hole 40 and reaches the valve body. Back pressure on 44.

When the electromagnetic coil 46 is energized, a magnetic circuit is formed around the electromagnetic coil 46, and the leakage magnetic flux attracts the plunger 48 upward against the biasing force of the coil spring 50. Then, the lower end surface of the plunger 48 opens the through hole 38. Due to this opening, the liquid in the back pressure portion 58 is discharged from the through hole 38 and flows out to the drainage portion 52. In addition, the diaphragm plate 32
Since the pressing force of is also released, the valve element 44 is moved upward by the elastic force of the diaphragm 12, and the valve seat 54 is opened. Then, the liquid that has reached the liquid supply unit 56 is discharged from the opened valve seat 54 to the liquid discharge unit 52. This allows the liquid to flow.

Then, when the energization of the electromagnetic coil 46 is stopped again in order to stop the flow of the liquid, the magnetic force disappears, and the plunger 48 moves downward again by the urging force of the coil spring 50 to press the diaphragm plate 32 and the through hole. Block 38. Therefore, the pressure in the back pressure portion 58 starts to increase due to the pressure of the liquid flowing in from the drawing port 24, and the valve element 44 descends. Meanwhile, the exit 24
Although the liquid flowing in from the inside enters into the depressurizing flow path 26, since the depressurizing flow path 26 is provided with the throttling portion 28 ..., the liquid is choked due to the abrupt change of the cross-sectional area of the flow path. Immediately after the portion 28, a vortex is generated and the energy of the liquid flow is consumed. Since this is repeated multiple times, the flow velocity drops and the extraction holes are
Since the energy of the liquid is largely consumed before entering from 40, the pressure in the back pressure portion 58 does not rise rapidly. Therefore, the seating of the diaphragm 12 on the valve seat 54 is delayed and becomes loose, and the water hammer can be suppressed. At this time, the length of the de-energizing flow path 26 and the number of throttle portions 28 ... May be appropriately set depending on the liquid supply pressure of the liquid in the liquid supply portion 56.

In the above-described embodiment, as the energy-reducing means with the changed cross-sectional shape, the flow passage area is suddenly expanded or reduced, or the projection in the flow passage is used. Installation,
The vortex may be generated by forming an uneven portion in the flow path, disposing an obstacle such as a turbulent flow forming plate, or the like. At that time, the length of the deenergizing flow path, the selection of the deenergizing means, the number of arrangements, and the like may be arbitrarily set in consideration of the usage conditions of the pilot valve.

Although various preferred embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and many modifications can be made without departing from the spirit of the invention. .

(Effects of the Invention) According to the pilot valve of the present invention, the deenergizing flow passage is formed between the flow passage plate and the diaphragm plate, and the cross-sectional shape of the deactivating flow passage is located in the middle of the deactivating flow passage. Since the de-energizing means that changes the pressure is formed integrally with the plate body or diaphragm plate, it is not affected by the deformation of the diaphragm, and even if the liquid pressure is high, it is possible to prevent the expansion of the de-energizing flow path, etc. It is possible to exert the energetic effect, and it is possible to reliably exert the effect of suppressing the water hammer at the time of design.

[Brief description of drawings]

FIG. 1 is a plan view of a diaphragm plate of an embodiment according to a pilot valve of the present invention, FIG. 2 is a plan view of a flow path plate, FIG. 3 is a sectional view of a valve body, and FIG. Sectional drawing of the incorporated pilot valve. 10 …… Pilot valve, 12 …… Diaphragm, 18 …… Flow passage plate, 26 …… Energizing flow passage, 28 …… Throttle section, 32 …… Diaphragm plate, 52 …… Drainage section, 54 …… Valve seat , 56 …… Liquid supply part, 58 ……
Back pressure part, 60 …… Valve chamber, 24 …… Extraction hole, 40 …… Extraction hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigumi Oyama 1588, Hachimanura, Suzaka, Suzaka, Nagano Pref., Kamibayashi Seisakusho Co., Ltd. (56) Reference JP-A-60-132186 (JP, A)

Claims (1)

[Claims] 1. A valve chamber formed of a flexible material, which defines a valve chamber into a liquid supply portion and a back pressure portion, opens and closes a valve seat provided in the drainage portion, and has front and back edges. A diaphragm having a through hole penetrating therethrough and a central hole being formed at the center, and a diaphragm formed of a material having rigidity, and fixed to the back pressure side of the diaphragm. A through hole that connects the back pressure portion and the drainage portion to the central protruding portion that fits into the central hole and is opened and closed by the plunger of the electromagnetic solenoid from the back pressure portion side is provided, and the through hole is provided at the edge portion. A diaphragm plate provided with extraction holes penetrating the front and back at different positions, and is formed using a material having rigidity, and is provided between the diaphragm and the diaphragm plate, and the surface in contact with the diaphragm is Fit into the through hole, center part A plate body having a drawing portion having a drawing hole penetrating through the front and the back, and a damping force formed between the plate body and the diaphragm plate and connecting the drawing hole and the extraction hole. A flow path and a de-energizing unit that is located in the middle of the de-energizing flow path and is integrally formed with the plate body or the diaphragm plate, and that changes the cross-sectional shape of the de-energizing flow path. Pilot valve.