JPH11132358A - Electromagnetic feed water valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit an effect for effectively preventing water hammer pressure which is self-generated by delivering a part of a fluid in an inflow port to an outflow pipe passage through a relief mechanism arranged in a inflow port, when pressure in the fluid which flows the inflow port arranged on a valve main body exceeds a prescribed pressure or more. SOLUTION: A main valve seat 15 arranged on a valve main body 17 is blocked by a diaphragm valve capable of displacement by fluid pressure which flows in, and a plunger 42 for blocking a pilot orifice 27 of the diaphragm valve is fitted in an inner circumference of a guide case 40 fixed to the valve main body 17. The plunger 42 is driven by a solenoid 47 including a coil 44. A relief mechanism 62 is arranged on a inflow port 12 side of the valve main body 17 in an electromagnetic feed water valve device, and a part of the fluid in the inflow port is delivered from a outflow hole 65 arranged to bypass the diaphragm valve into the outflow pipe passage 14 by opening the relief mechanism 62, when pressure in the fluid which flows the inflow port 12 exceeds a prescribed pressure or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a valve in a water supply pipe line or the like (hereinafter referred to as a line) in a flow path of a fluid such as water and opening and closing a pilot orifice of a diaphragm valve with a plunger. The invention relates to a pilot-type electromagnetic water supply valve device that opens and closes a main valve seat by interlocking a diaphragm valve with a relief valve mechanism, and more specifically, a so-called water hammer that propagates from a water supply piping line or the like. When the pressure of the fluid flowing through the inflow port becomes equal to or higher than a predetermined pressure (for example, in normal tap water, the tap water pressure is 784 kPa (kilopascal) or more) due to externally generated pressure, etc. A pilot-type electromagnetic water supply valve device capable of allowing a part of a fluid flowing through the inflow port to flow out to an outflow line from an inflow hole of a relief valve mechanism provided in a certain inflow line. On.

[0002]

2. Description of the Related Art Conventionally, a pilot-type electromagnetic water supply valve device (hereinafter, referred to as a conventional device) mounted on a household electric appliance (for example, a fully automatic washing machine, a dishwasher, etc.) has an inflow port (hereinafter referred to as a conventional device). For example, the industry standardizes the screw connection and diameter of a water supply hose, etc., such as the nominal size of a threaded joint PT3 / 4 and the nominal size of 20. Foreign matter (eg, insects, sand, iron chips, etc.) is provided at the inflow port. ) A metal filter of about 60 mesh to prevent mixing and an elastic member for controlling the flow rate (for example, NB)
The flow sheet of R) is often incorporated. ), An inflow conduit, an inflow chamber (outer peripheral portion of the outflow conduit), a main valve seat (a portion in which an outer peripheral portion of an end portion of the outflow conduit has a reduced thickness), an outflow conduit, and an outlet. A diaphragm valve (valve element) is installed on a valve body of a resin molded member (for example, a polypropylene resin) having a main body so as to close a main valve seat, and a liquid-tight packing portion of a diaphragm of the diaphragm valve is pressed against the valve body. A guide case (the inside is referred to as a back pressure chamber) of a resin molded member (for example, a nylon resin) is pressed so that the pilot orifice of the diaphragm valve is closed on the inner periphery of the guide case. A plunger of a magnetic member to which a soft plunger sheet (valve element) of an elastic member (for example, silicon rubber) is fixed, and a coil spring (for example, a stainless steel wire) which constantly urges the plunger are housed. , The outer periphery of the guide case copper wire (e.g., enamel wire) that the solenoid connected to the terminal strip wound on cylindrical bobbins are configured by installing are known. The diaphragm valve is provided, for example, on at least one small hole and one medium hole provided in a soft diaphragm made of an elastic member (for example, silicone rubber), and on one surface of a hard disk of a resin molded member (for example, polyacetal resin). At least one small protrusion and one middle protrusion are fitted and connected to each other, and the small protrusion protrudes from an outer peripheral portion of the diaphragm valve, and a side orifice penetrating the inflow chamber and the back pressure chamber. (Small hole), and the central projection of the diaphragm valve protrudes from the center of the diaphragm valve. The pilot orifice (medium hole) penetrates the back pressure chamber and the back pressure chamber outlet.
It has.

When an electric current is applied to the solenoid, the plunger is sucked into a substantially central portion of the guide case installed inside the solenoid, and the plunger sheet closing the pilot orifice is removed. Leave. Then, the fluid in the inflow chamber flows into the back pressure chamber from the side orifice, passes through the pilot orifice and the back pressure chamber outlet, and flows out to the outlet pipe and the outlet. When the passage is opened, the diaphragm valve floats from the main valve seat due to the pressure of the fluid in the inflow chamber, and most of the fluid flows into the inflow port, the inflow line, the inflow chamber, the main valve seat. , And flows out through the outflow pipe and the main flow path of the outflow port.

Then, when the current is stopped flowing through the solenoid, the plunger is restored to the normal position by the coil spring, and the plunger seat closes the pilot orifice. Then, the fluid flowing from the side orifice into the back pressure chamber loses its destination and presses the diaphragm valve floating from the main valve seat against the main valve seat due to an increase in fluid pressure. Become. Then, the main valve seat is suddenly closed by the diaphragm valve to stop water.

At the same time as the water stoppage, near the main valve seat, the kinetic energy changes to an increase in pressure due to a sudden change in the kinetic state of the fluid, and a rapid pressure increase called a water hammer pressure occurs.
Reflux begins. Then, the normal flow and the reverse flow collide with each other, forming a pressure wave of a water hammer pressure, reciprocating in the line with the main valve seat, and gradually attenuating. This phenomenon is called water hammer, which causes vibration in the line and causes noise. or,
If it occurs frequently, it causes problems such as breakage of lines, failure of instruments and control devices, and the like, which may cause water leakage. For this reason, in conventional devices, as a method of suppressing this water hammer, a diaphragm valve in which a diaphragm valve slowly closes a main valve seat has been developed. For example, JP-A-60-132186
JP-A-1-210677, JP-A-1-21618
There is a technique disclosed in No. 3 and the like. (Hereinafter, a conventional device equipped with a diaphragm valve that slowly closes is referred to as an improvement device.)

[0006] However, after the diaphragm valve of the improvement device slowly closes the main valve seat, for example, a conventional device mounted on another household electric appliance operates to apply a pressure wave of water hammer pressure to the line. In the case of propagation, the suppression effect does not work for the water hammer, which is the so-called externally generated pressure, propagating from the line, even though it is an improvement device. Therefore, in order to reduce the self-generated water hammer pressure and the pressure generated from outside, a relief valve mechanism that allows a part of the fluid to flow from the inflow chamber to the outflow pipe has been proposed to be buried from outside the valve body. I have. For example, Japanese Patent Application Laid-Open
163784, JP-A-5-154284, JP-A-8-178125, and the like.
(Hereinafter, a conventional device or an improvement device equipped with a relief valve mechanism is referred to as a preceding device.)

[0007]

However, although the prior art apparatus has a structure that is easy to assemble, a seal portion (for example, O) is required to incorporate a relief valve mechanism component from the outside of the valve body toward the inflow chamber. Ring) is required, and depending on the usage environment of household electrical equipment, there is a problem of reliability in that water leaks slightly outside the valve body.
Also, when the pressure generated from the outside reaches the inflow chamber from the inflow port of the preceding device, the relief valve mechanism is activated, and a part of the fluid in the inflow chamber flows out to the outflow pipe. A part of the fluid in the chamber flows into the back pressure chamber from the side orifice of the diaphragm valve, and the pressure in the back pressure chamber increases, causing damage such as damage to the guide case, which may cause water leakage. There is a point.

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 seal portion from the outside of a valve body which is necessary for the preceding apparatus. It is effective to prevent self-generated water hammer pressure, and to prevent externally generated pressure, etc. An object of the present invention is to provide a so-called highly reliable pilot-type electromagnetic water supply valve device that does not leak even a small amount of water outside the valve body by reducing the pressure of the flowing fluid to a predetermined pressure or less.

[0009]

In order to achieve the above object, a pilot-type electromagnetic water supply valve device of the present invention is provided with an inflow hole of a relief valve mechanism having no seal portion in a valve body in an inflow pipe. When the pressure of the fluid flowing through the inlet becomes equal to or higher than a predetermined pressure, a part of the fluid flowing through the inlet is discharged to the outlet pipe.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a pilot type electromagnetic water supply valve device 10 (hereinafter, referred to as the present device) on which a relief valve mechanism of the present invention is mounted. In this device,
The main valve seat 15 is closed by a valve body 17 having an inflow port 11, an inflow pipe 12, an inflow chamber 13, a main valve seat 15 provided at an end face of the outflow pipe 14, and an outflow port 16. A diaphragm valve displaceable by the flowing fluid pressure is installed, and the guide case 40 is pressed against the valve body 17 so as to press the liquid-tight packing portion 33 of the diaphragm of the diaphragm valve,
A plunger 42 to which a plunger seat 41 is fixed so as to close the pilot orifice 27 of the diaphragm valve and a coil spring 43 pressing the plunger 42 are housed in the inner periphery of the guide case 40.
On the outer periphery of the guide case 40, a solenoid 47 in which a copper wire 44 called a magnet wire is wound around a cylindrical bobbin 45 and connected to a terminal piece 46 is provided.

The relief valve mechanism according to one embodiment of the present invention includes a relief pipe 60, a relief valve seat 62 having an inflow hole 61 (for example, φ1), and an elastic member (for example, silicon) for closing the relief valve seat 62. Rubber) soft relief sheet (valve element) 63, a relief coil spring 64 (for example, a spring load of 50 g) which constantly urges the relief sheet 63, and an outflow hole provided in the outflow pipe 14. 65. In this device,
An outflow hole 65 (for example, φ1.2) is provided in the outflow pipe 14, and the outflow pipe 14 passes through the inflow chamber 13 from the outflow pipe 14.
2, a relief coil spring 64 and a relief seat 6 are provided inside the relief tube 60.
Then, the end face of the relief pipe 60 and the end face of the relief valve seat 62 are connected (for example, heat welding, ultrasonic welding, press fitting, screwing, and heat caulking after screwing) to assemble. As described above, one embodiment of the present apparatus is the one in which the inflow pipe 1 is located at the position where it can be detected earliest against externally generated pressure or the like.
2, the valve body 17 is provided with an inflow hole 61 of a relief valve mechanism without a seal portion, and a part of the fluid flowing through the inflow port 11 is discharged to an outflow pipe before an externally generated pressure or the like reaches the inside of the apparatus. It is characterized in that it can be discharged to the road 14.

In another embodiment, a threaded hole (not shown) is provided in the main valve seat 15 in place of the outlet hole 65 so that a relief valve mechanism is provided in the inlet line 12. In addition, the relief valve unit (although not shown in the drawing), which has a threaded portion provided with an outflow hole substantially at the center at the pipe end, is inserted into the threaded hole. A relief valve seat 62 having a relief coil end 64 and an inflow hole 61 into which a relief coil spring 64 and a relief seat 63 are inserted.
May be screwed together. If the threading cannot be adopted in terms of cost, a means for press-fitting with a tapered shape may be used.

The passage through which the fluid flows from the inflow port 11 to the inflow chamber 13 (between the inflow pipe 12 and the relief pipe 60) has a water stopping function in addition to the reinforcement and rectification effect of the relief pipe 60. A rectifying blade may be provided for improvement. Since the total cross-sectional area of the passage approximates the cross-sectional area of a 6 mm round hole, water supply of 11 liters per minute is possible at a water pressure of 98 kPa. Although there is a slight contraction loss, it is of no problem in practical use.

As a matter of course, a metal filter, a flow sheet and the like can be incorporated in the inflow port 11 similarly to the conventional apparatus.

For reference, for example, the Japan Water Works Association etc. has published a test method for water hammer action, but 147 kPa
When the device is automatically closed suddenly at a dynamic water pressure of 4,
The reference value of a water hammer pressure of 41 kPa or less is sufficiently satisfied. The reference value is also satisfied when the conventional device is installed so as to face the present device, and the conventional device is automatically and suddenly closed at the hydrodynamic pressure.

As described above, various combinations and the like of the preferred embodiments of the present invention have been described. However, the present invention is not limited to the above-described embodiments, and a number of combinations are possible without departing from the spirit of the invention. Needless to say, combinations, modifications and the like can be made.

[0017]

The present device eliminates the need for a seal from the outside of the valve body, which is required for the preceding device, and exhibits an effective deterrent effect against self-generated water hammer pressure. With respect to the generated pressure and the like, by setting the pressure of the fluid flowing through the inflow port to a predetermined pressure or less before reaching the inside of the present device, there is an effect that even a small amount of water does not leak to the outside of the valve body. Further, in this device, since the shape and dimensions of the valve body are substantially the same as those of the conventional device, the water hammer can be easily improved only by replacing parts with the conventional device which has been mounted on household electric equipment. It has the effect of

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pilot type electromagnetic water supply valve device equipped with a relief valve mechanism of the present invention.

[Explanation of symbols]

10 ... this device, 11 ... inlet, 12 ... inflow line, 13 ...
Inflow chamber, 14 outflow line, 15 main valve seat, 16 outlet, 17 valve body, 27 pilot orifice, 3
3 Liquid-tight packing part, 40 Guide case, 41 Plunger sheet, 42 Plunger, 43 Coil spring, 44 Copper wire, 45 Cylindrical bobbin, 46 Terminal piece, 47 Solenoid, 60 Relief Pipe line, 61 ... inlet hole, 62 ... relief valve seat, 63 ... relief seat, 6
4: Relief coil spring, 65: Outlet

Claims (1)

[Claims] An inflow hole of a relief valve mechanism having no seal portion in a valve body is provided in an inflow pipe, and when a pressure of a fluid flowing through the inflow port becomes equal to or higher than a predetermined pressure, a flow of the fluid flowing through the inflow port is reduced. A pilot-type electromagnetic water supply valve device characterized in that a part is discharged into an outflow pipe.