JP2000018419A - Electromagnetic proportional control valve and electromagnetic proportional control valve device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the proportion with high reliability with an inexpensive structure in a pilot-type electromagnetic proportional valve for controlling the exit flow rate on the basis of the desired flow rate by making the thickness of a curved portion of an outer periphery of a valve element closing a pilot seat of a pilot valve seat, thicker than a side portion by a specific amount. SOLUTION: A diaphragm valve displaceable by the fluid pressure is mounted on a valve body in such manner that it closes a main valve seat 15. That is, a guide case is pressed and fixed to the valve body in such manner that a packing portion 24 of the diaphragm valve is pressed, and a plunger on which a mushroom-shaped pilot valve seat is fixed, and a coil spring for energizing the same in the main valve seat direction are accommodated in an inner periphery of the guide case. A curved portion 55 of an outer periphery of the valve element 54 closing a pilot seat 35 of a pilot valve seat is made thicker than a side portion 56 (elastically deformable portion) by more than two times. Whereby the exist flow rate can be linearly varied when a solenoid 70 is energized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diaphragm valve which is installed in a water supply pipe line or the like in a flow path of a fluid such as water, and which opens and closes a main valve seat in conjunction with a pilot valve which opens and closes a pilot valve seat. Pilot system that can control the outflow flow rate to the required flow rate by varying the DC voltage applied to the solenoid and exciting the solenoid to change the floating displacement of the diaphragm valve in conjunction with the plunger that is displaced by suction And an electromagnetic proportional control valve.

[0002]

2. Description of the Related Art Conventionally, a valve device which can be installed in a water supply pipe line or the like in a flow path of a fluid such as water to control an outflow flow rate to a required flow rate includes, for example, an electric proportional control which can directly open and close a flow path. Valve, commercial power 100V AC (50Hz and 60Hz
Pilot-type electromagnetic water valve (commonly used)
It is called an AC valve. ) And a motor-driven flow proportional control device are known. However, these valve devices are designed for the purpose of performing proportional control from the beginning, and many of them are not designed as alternatives to other valve devices, particularly, AC valves. Incidentally, the price as of the filing date of the present invention is often 800 to 1200 yen or more.

[0003]

Conventionally, an AC valve mounted on a household electric appliance (for example, a fully automatic washing machine, a dishwasher, a toilet with a local washing device, etc.) has an inlet (for example, a screw). Nominal size of joint PT3 / 4, nominal size 20
Thus, the industry standardizes the screw connection and the diameter of the water supply hose and the like. Foreign matter (for example, insects,
A metal filter of about 60 to 100 mesh for preventing mixing, such as sand and iron chips, and an elastic member for controlling the maximum flow rate (for example, N
A BR) flow sheet or the like is often incorporated. )When,
Inflow conduit, inflow chamber (outer peripheral wall of outflow conduit), and main valve seat (portion where outer peripheral wall of outer end wall of outlet conduit is thinned)
A diaphragm valve (main valve body) is installed on a valve body of a resin molded member (for example, polypropylene resin) having an outflow conduit and an outlet so as to close a main valve seat. A resin molded member (for example, nylon resin) that presses the liquid-tight packing part of the diaphragm of the diaphragm valve
And a soft pilot valve made of an elastic member (for example, silicone rubber) such that the pilot valve seat of the diaphragm valve is closed on the inner periphery of the guide case. A plunger (eg, stainless steel) of a magnetic member to which a seat (pilot valve body) is fixed, and a compression coil spring (eg, stainless steel wire) that constantly urges the plunger toward the main valve seat are housed. Then, a copper wire (for example, enameled wire) is wound around a cylindrical bobbin on the outer periphery of the guide case and connected to the terminal piece, and an electric insulating material (for example, polyester resin,
Adhesive sealing materials such as epoxy resin, silicone resin, urethane resin, etc., including those for other materials such as waterproofing materials, moistureproofing materials, and dew condensation preventing materials. ), And a solenoid which is surrounded by a yoke having a pole piece is provided. Incidentally, in the AC valve introduced in this specification, the price as of the filing date of the present invention is 45%.
It is 0 yen. The diaphragm valve includes, for example, a small hole and a medium hole provided in a soft diaphragm made of an elastic member (for example, silicone rubber), and a truncated cone provided on a surface side of a hard disk of a resin molded member (for example, polyacetal resin). The small projections are connected to each other by inserting and inserting the hollow cylindrical middle projections. The small projections protrude from the outer periphery of the diaphragm valve, and the side projections penetrate the inflow chamber and the back pressure chamber.
A pilot orifice (small hole) which has an orifice (small hole) and has a center projection having a rectifying blade at the tip thereof protruding from a substantially central portion of the diaphragm valve, and penetrating the back pressure chamber and the back pressure chamber outlet. It has.

When an alternating current is passed through the solenoid,
The plunger is sucked into a substantially central portion in the guide case installed inside the solenoid, and the soft pilot valve seat closing the pilot orifice is separated. 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. The outflow flow rate is limited by a flow sheet or the like of an elastic member for maximum flow rate control incorporated in the inflow port, but has a structure in which the flow rate cannot be electrically varied. If it were absolutely necessary, the operator of the household electrical equipment had no choice but to change the flow rate with a tap or a cock provided in the water supply piping line or the like.

Next, when the flow of alternating current to the solenoid is stopped, the plunger is restored by the compression coil spring, and the soft pilot valve seat is moved to the pilot valve.
Close the orifice. Then, the fluid flowing into the back pressure chamber from the side orifice loses its destination,
Due to the increase in the fluid pressure, the diaphragm valve floating from the main valve seat is pressed against the main valve seat. 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 sharp pressure rise called a water hammer pressure occurs.
Reflux begins. Then, the normal flow and the reverse flow collide, and become pressure wave of water hammer pressure, reciprocate between the main valve seat and the water supply pipe line, and gradually attenuate. This phenomenon is called a water hammer, which causes vibration in a water supply piping line or the like and causes noise. Further, if it is frequently generated, it may cause adverse effects such as breakage of a water supply pipe line or a failure of an instrument or a control device, and may cause water leakage.
In the AC valve, a water hammer countermeasure technology shown below has been separately required. By the way, it becomes 50-100 yen higher.
For example, a technique for reducing the self-generated water hammer pressure as described above (for example, a technique for providing a hard disk with a fluid decelerating flow path as disclosed in Japanese Patent Application Laid-Open No. Hei 1-210677) and another technique. When an AC valve mounted on household electric equipment is operated to propagate a pressure wave of water hammer pressure to a water supply piping line, etc., a water hammer so-called externally generated pressure transmitted from the water supply piping line or the like. (For example, a technology for burying a relief valve mechanism as disclosed in Japanese Patent Application Laid-Open No. 8-178125).

[0007] Recently, there has been an increasing demand for adding a flow rate proportional control function to a low-priced household electric appliance equipped with the AC valve at a low cost in order to differentiate products. . For example, in a fully automatic washing machine, the flow rate of rinsing water can be varied according to the amount of washing, in a dishwasher, a rhythm-like shower can be washed by weakly or intensely pouring water. There is a demand to vary the amount. The requirement items described in the customer requirement specification that summarizes these requirements include, for example, the following items.
"The price of the solenoid proportional control valve alone should be the same as that of the AC valve, or about plus alpha. The mounting space is the same as the current product, so there is only space for one AC valve and feedback from the flow sensor etc. Even if there are parts, there is no space for mounting.
Due to the restriction of the ROM capacity for storing the control program built in the microcomputer mounted on the electric circuit board unit of household electric equipment, the detection of the position of the electric motor and the plunger of the electric proportional control valve, the processing of the feedback signal of the flow sensor, etc. Many control programs such as can not be entered. Take measures against water hammer as much as possible. And so on.
Due to the above demand, there is a problem that a conventional electric proportional control valve or the like cannot be used in terms of cost or as a substitute for an AC valve.

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 perform proportional control based on an inexpensive and highly reliable AC valve. It is an object of the present invention to provide a cost-effective electromagnetic proportional control valve. Another object of the present invention is to provide an electromagnetic proportional control valve device capable of performing automatic proportional control in order to reduce a control program load on a microcomputer mounted on an electric circuit board unit of household electric equipment.

[0009]

In order to achieve the above object, in the electromagnetic proportional control valve according to the present invention, the main valve having a main valve seat and a pilot valve for opening and closing the pilot valve seat are interlocked. A diaphragm valve for opening and closing the seat, a compression coil spring A mounted between the diaphragm valve and the pilot valve seat, a pilot valve connecting the mushroom-shaped pilot valve seat and the plunger, and a main valve seat for the plunger. A compression coil spring B which is always resiliently biased in the direction, a guide case for accommodating the plunger and the compression coil spring B, and a solenoid. The solenoid is formed by varying a DC voltage applied to the solenoid. By exciting, the floating displacement of the diaphragm valve is changed in conjunction with the plunger which is displaced by suction, and A pilot type electromagnetic proportional control valve capable of controlling a required flow rate, wherein the diaphragm valve has a small hole and a medium hole provided in a soft diaphragm, a small frustoconical projection provided on a surface side of a hard disk, and a hollow. The small protrusion is protruded from the outer periphery of the diaphragm valve, and the middle protrusion is protruded from the substantially central portion of the diaphragm valve. A pilot valve seat provided with a through hole called an orifice and having a through hole through the pilot valve seat, which is called a pilot orifice and protruding from the back surface side of the hard disk, at the center protrusion; The thickness of the curved portion on the outer periphery of the valve body that closes the pilot valve seat is twice or more than that of the side portion. Also, the shape of the middle protrusion of the hard disk at the portion protruding from the soft diaphragm is a conical shape from the soft diaphragm surface in the vertical direction, and the tip thereof is a cylinder having a rectifying blade. Furthermore, a pilot valve seat anti-adhesion groove formed radially is provided on the outer peripheral portion of the pilot valve seat on the back surface side of the hard disk. And
A pilot wall for preventing deformation of the pilot valve seat is provided on an outer peripheral portion of the groove for preventing adhesion of the pilot valve seat. The guide case is provided with a protruding wall for preventing deformation of the pilot valve seat. In the electromagnetic proportional control valve device of the present invention, a flow rate sensor is provided at an outlet of the valve body of the electromagnetic proportional control valve, and at least a power supply + side cable, a power supply-side cable, a required flow rate signal cable, An electric circuit board unit to which an external cable having a connection can be connected is provided, and a device capable of automatically controlling the outflow flow rate to a required flow rate by self-variing a DC voltage applied to a solenoid by an output signal of the flow rate sensor is provided. Features.

[0010]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of an electromagnetic proportional control valve 10 according to an embodiment of the present invention when a solenoid is demagnetized, and FIG. 2 is a cross-sectional view of the electromagnetic proportional control valve 10 according to an embodiment of the present invention when a solenoid is excited. In the electromagnetic proportional control valve 10 according to one embodiment of the present invention, the main valve seat 15 provided at the end face of the inflow port 11, the inflow pipe 12, the inflow chamber 13, and the outflow pipe 14.
The main valve seat 15 is closed by a valve body 17 (a conventional AC valve can also be used.) Having an outlet 16 and an outlet 16.
The diaphragm valve 20 which can be displaced by the flowing fluid pressure is installed, and the guide case 60 is pressed against the valve body 17 so as to press the liquid-tight packing portion 24 of the soft diaphragm 21 of the diaphragm valve 20. The wall receives a compression coil spring A40 mounted between the diaphragm valve 20 and the pilot valve seat 51, and receives the side portion 56 of the pilot valve seat 51 closing the pilot valve seat 35 of the diaphragm valve 20, A plunger 52 to which the pilot valve seat 51 is fixed and a compression coil spring B53 which constantly urges the plunger 52 toward the main valve seat are provided on the inner periphery of the guide case 60.
And a copper wire 71 called a magnet wire is provided on the outer periphery of the guide case 60 in a cylindrical bobbin 7.
2 and connected to the terminal piece 73, sealed with an electric insulating material 74 to form a completed coil, and the completed coil is mounted between a yoke A 76 having a pole piece 75 and a yoke B 77 having a pole piece 75. Further, a solenoid 70 in which the yoke A76 and the yoke B77 are connected is provided.

FIG. 3 (a) is a perspective view of a soft diaphragm 21 having one small hole 22, and FIG. 3 (b) is a front perspective view of a hard disk 30 having one small projection 31. 3 (c) is a perspective view of a soft diaphragm 21 having a plurality of small holes 22, and FIG. 3 (d) is a front perspective view of a hard disk 30 having a plurality of small projections 31. FIG. 4 is a perspective view of the back surface side of the hard disk 30. The diaphragm valve 20 includes a small hole 22 (a plurality of holes may be provided) provided in a soft diaphragm 21 and a medium hole 23.
At this time, the small protrusions 31 (there may be a plurality of truncated cones) provided on the surface side of the hard disk 30 and the middle protrusions 33 in the form of hollow cylinders are joined by being inserted. The small protrusion 31 protrudes from the outer peripheral portion of the diaphragm valve 20, and the middle protrusion 33 protrudes from a substantially central portion of the diaphragm valve 20,
The small projections 31 are provided with through holes called side orifices 32 (when there are a plurality of small projections 31, at least one small projection 31 may have a through hole).
A pilot valve seat 35, which is called a pilot orifice 39 and protrudes from the rear surface of the hard disk,
Is provided with a through hole. The shape of the middle projection 33 is
It is a circular cylinder having a conical shape from the soft diaphragm surface in the vertical direction and having a straightening vane 34 at the tip. With this shape, the outflow flow rate can be linearly varied. A pilot valve seat anti-adhesion groove 37 formed radially is provided on an outer peripheral portion of the pilot valve seat 35. Without this, the pilot valve seat 51 may not be able to peel off from the back side of the hard disk due to the surface tension of water.
Further, a projecting wall 38 for preventing deformation of the pilot valve seat is provided on an outer peripheral portion of the groove 37 for preventing sticking of the pilot valve seat. This also serves as a receiving portion for the compression coil spring A40.

The pilot valve seat 51 is made of soft rubber and has a mushroom shape. The thickness of the curved portion 55 on the outer periphery of the valve body portion 54 that closes the pilot valve seat 35 is at least twice as thick as the side portion 56 (the portion that makes elastic deformation). Accordingly, in conjunction with the movement of the plunger 52 that is attracted and displaced when a DC voltage is applied to the solenoid 70 to excite the solenoid, when the pilot valve seat closing the pilot valve seat is separated, the side portion 56
Only the movable portion 55 can move, and the curved portion 55 can substantially maintain the curved shape. By substantially maintaining this shape, it is possible to linearly vary the outflow flow rate.

The guide case 60 is provided with a projecting wall 61 for preventing deformation of the pilot valve seat. Without this, the side portion 56 of the pilot valve seat 51 made of soft rubber is abnormally deformed and cannot be restored. Since the compression coil spring A40 also presses the side portion 56, it also has a role of preventing the pilot valve seat from deforming.

By manufacturing the electromagnetic proportional control valve 10 with the configuration and components as described above, it is possible to perform proportional control at 500 yen, which is almost equal to the price of a conventional AC valve. Naturally, a flow sheet or the like can be incorporated into the inflow port 11 in the same manner as a conventional AC valve.

FIG. 5 is a sectional view of an electromagnetic proportional control valve device 80 according to one embodiment of the present invention. In the electromagnetic proportional control valve device 80 according to one embodiment of the present invention, in order to reduce the load on the control program of the microcomputer, the flow rate sensor 81 (the magnet is built in the impeller) is provided at the outlet 16 of the electromagnetic proportional control valve 10. The electric circuit board unit 83 having the magnetic detection means 82 and the external cable connector 91 is put in a potting case 84, and a potting material 86 is provided.
(For example, electric insulating materials such as urethane resin, polyester resin, epoxy resin, and silicone resin, adhesive sealing materials, and the like, including those for other materials such as a waterproofing material, a moisture-proofing material, and a dew-condensing material.) The electromagnetic proportional control valve 1 is sealed so that the terminal piece 73 of the solenoid 70 of the electromagnetic proportional control valve 10 is inserted into the through hole of the designated electric circuit board.
0, and the terminal piece 73 of the solenoid 70 of the electromagnetic proportional control valve 10 is soldered and fixed (may be sealed with the above-mentioned electric insulating material or the like), and a lid case. 85, and is fixed by a fixing band 95 (for example, an insulok, a string, a rubber ring, a stopper).
The external cable 90 (at least the power supply + side cable 9) extending from the electric circuit board unit of the household electric appliance
1, a power supply-side cable 92, and a required flow signal cable 93. ) Indicates the electric circuit board unit 8
3 to the external cable connector 94.

An operation of the electromagnetic proportional control valve device 80 according to one embodiment of the present invention, which can reduce the control program load of the microcomputer mounted on the electric circuit board unit of the home electric appliance will be described. First, when a required flow rate pulse signal including the start of water supply is received from a microcomputer mounted on an electric circuit board unit of a household electric appliance, the DC voltage applied to the solenoid 70 is self-variable from DC 0 V to DC 6 V, and the flow rate sensor is changed. 81 (the outlet 1 of the valve body 17)
6 waits for the magnetic detecting means 82 attached to the outer peripheral wall, for example, a magnetic detection signal of a Hall IC, a reed switch or the like.
When the output signal is present, it is further self-variable from DC6V to the booster side (in one embodiment of the present invention, up to DC12V).
Then, the DC voltage is self-variable while comparing the flow rate of the output signal by increasing the outflow flow rate with the required flow rate. (Hereinafter, the required flow rate is maintained by repeating the comparison variable.) When the required flow rate pulse signal including the stop of water supply is received from the microcomputer, the DC voltage applied to the solenoid 70 is slowly and self-variably reduced to DC6V. The flow rate of the outflow is reduced, and the flow waits until the output signal from the flow rate sensor 81 disappears. When the output signal disappears, the voltage is self-variable further from DC 6 V to the reduced pressure side, and finally self-variable to DC 0 V. As described above, when the outflow flow rate is gradually reduced, the self-generated water hammer pressure can be reduced. In particular, water hammer countermeasure technology is not required, and the cost can be reduced.

For reference, for example, the water hammer action test method of the water hammer limit performance standard of the ministerial ordinance on the standards of the structure and the material of the water supply device (Ministry of Health and Welfare Ordinance No. 14 of 1997) is 0.15.
At a dynamic water pressure of MPa, when the present apparatus is automatically closed suddenly, the reference value of a water hammer pressure of 1.5 MPa or less is sufficiently satisfied.

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.

[0019]

According to the electromagnetic proportional control valve of the present invention, since a proportional control is devised based on an inexpensive and highly reliable AC valve, the proportional control can be performed at substantially the same cost. Play. Further, in the electromagnetic proportional control valve device of the present invention, the control program load of the microcomputer mounted on the electric circuit board unit of the household electric appliance can be reduced, and the self-generated water hammer pressure can be further reduced. This has the effect.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electromagnetic proportional control valve according to an embodiment of the present invention when a solenoid is demagnetized.

FIG. 2 is a cross-sectional view of the electromagnetic proportional control valve according to the embodiment of the present invention when a solenoid is excited.

FIG. 3 is a perspective view of a soft diaphragm and a hard disk surface side.

FIG. 4 is an enlarged perspective view of the back side of the hard disk.

FIG. 5 is a sectional view of an electromagnetic proportional control valve device according to one embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Electromagnetic proportional control valve, 11 ... Inflow port, 12 ... Inflow line, 13 ... Inflow chamber, 14 ... Outflow line, 15 ... Main valve seat, 1
6 ... outlet, 17 ... valve body, 18 ... metal filter, 20
... diaphragm valve, 21 ... soft diaphragm, 22 ... small hole, 23 ... medium hole, 24 ... liquid tight packing part, 30 ... hard disk, 31 ... small protrusion, 32 ... side orifice, 3
3 ... middle projection, 34 ... rectifying blade, 35 ... pilot valve seat,
36: Back pressure chamber outlet, 37: Pilot valve seat anti-adhesive groove, 38: Projecting wall, 39: Pilot orifice, 40: Compression coil spring A, 50: Pilot valve, 51: Pilot valve seat, 52 ... Plunger, 5
3 compression coil spring B, 54 valve body, 55 curved part, 56 side part, 60 guide case, 61 projecting wall, 70 solenoid, 71 copper wire, 72 cylindrical bobbin, 73 terminal piece, 74 electric insulating material, 75 pole piece, 76 yoke A, 77 yoke B, 78 yoke fixing screw, 80 electromagnetic proportional control valve device, 81 flow rate sensor, 82 magnetic detection means 83, an electric circuit board unit, 84, a potting case, 85, a lid case,
86: potting material, 90: external cable, 91: power supply + side cable, 92: power supply-side cable, 93: required flow signal cable, 94: connector for external cable, 9
5. Fixed band

[Procedure amendment]

[Submission date] July 22, 1998 (1998.7.2
2)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 1

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

[0009]

Means for Solving the Problems In order to achieve the above object, in the electromagnetic proportional control valve of the present invention, the main valve having a main valve seat and a pilot valve for opening and closing the pilot valve seat are interlocked. A diaphragm valve for opening and closing the seat, a compression coil spring A mounted between the diaphragm valve and the pilot valve seat, a pilot valve connecting the mushroom-shaped pilot valve seat and the plunger, and a main valve seat for the plunger. A compression coil spring B which is always resiliently biased in the direction, a guide case for accommodating the plunger and the compression coil spring B, and a solenoid. The solenoid is formed by varying a DC voltage applied to the solenoid. By exciting, the floating displacement of the diaphragm valve is changed in conjunction with the plunger which is displaced by suction, and A pilot-type electromagnetic proportional control valve capable of controlling the flow rate to a required flow rate, wherein the diaphragm valve has a small hole and a medium hole provided in a soft diaphragm, a small frustoconical projection provided on the surface side of a hard disk, and The small protrusion is protruded at the outer peripheral portion of the diaphragm valve, and the middle protrusion is protruded at a substantially central portion of the diaphragm valve. A pilot orifice having a through-hole called a side orifice and having a through-hole called a pilot orifice that penetrates a pilot valve seat protruding from the back side of a hard disk. The thickness of the curved portion on the outer periphery of the valve body that closes the pilot valve seat of the seat is 1. It is characterized by being at least twice as thick. Also, the shape of the middle protrusion of the hard disk at the portion protruding from the soft diaphragm is a conical shape from the soft diaphragm surface in the vertical direction, and the tip thereof is a cylinder having a rectifying blade. Furthermore, a pilot valve seat anti-adhesion groove formed radially is provided on the outer peripheral portion of the pilot valve seat on the back surface side of the hard disk. And on the outer peripheral portion of the pilot valve sheet anti-adhesive groove,
A protrusion wall for preventing deformation of the pilot valve seat is provided. The guide case is provided with a protruding wall for preventing deformation of the pilot valve seat. In the electromagnetic proportional control valve device of the present invention, a flow rate sensor is provided at an outlet of the valve body of the electromagnetic proportional control valve, and at least a power supply + side cable, a power supply-side cable, a required flow rate signal cable, An electric circuit board unit to which an external cable having a connection can be connected is provided, and a device capable of automatically controlling the outflow flow rate to a required flow rate by self-variing a DC voltage applied to a solenoid by an output signal of the flow rate sensor is provided. Features.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

The pilot valve seat 51 is formed of soft rubber and has a mushroom shape. The thickness of the curved portion 55 on the outer periphery of the valve body portion 54 that closes the pilot valve seat 35 is greater than that of the side portion 56 (the portion that makes elastic deformation) . More than twice as thick. Accordingly, in conjunction with the movement of the plunger 52 that is attracted and displaced when a DC voltage is applied to the solenoid 70 to excite the solenoid, when the pilot valve seat that has closed the pilot valve seat separates, only the side portion 56 is released. Is movable, and the curved portion 55 can substantially maintain a curved shape. By substantially maintaining this shape, it is possible to linearly vary the outflow flow rate.

Claims (6)

[Claims] 1. A valve body having a main valve seat, a diaphragm valve that opens and closes the main valve seat by interlocking a pilot valve that opens and closes a pilot valve seat, and is mounted between the diaphragm valve and a pilot valve seat. Compression coil spring A
, A pilot valve in which a mushroom-shaped pilot valve seat and a plunger are connected, and a compression coil spring B which constantly urges the plunger toward the main valve seat.
And a guide case for accommodating the plunger and the compression coil spring B, and a solenoid, and the DC voltage applied to the solenoid is varied to excite the solenoid, thereby interlocking with the plunger that is attracted and displaced. A floating displacement of the diaphragm valve is variable, which is a pilot-type electromagnetic proportional control valve capable of controlling an outflow flow rate to a required flow rate, wherein the diaphragm valve has a small hole and a medium hole provided in a soft diaphragm, and a hard disk with a hard disk. The truncated conical small protrusion provided on the front surface side and the hollow cylindrical central protrusion are connected by being inserted and fitted, and the small protrusion is provided on the outer peripheral portion of the diaphragm valve, substantially in the center of the diaphragm valve. The small protrusion is provided with a through hole called a side orifice, and the small protrusion is called a pilot orifice. The pilot valve seat has a through hole that penetrates the pilot valve seat protruding from the rear surface side of the valve. An electromagnetic proportional control valve characterized by being twice or more thicker. 2. The hard disk according to claim 1, wherein the middle protrusion of the hard disk at a portion protruding from the soft diaphragm has a conical shape in a vertical direction from a surface of the soft diaphragm, and a tip thereof is a cylinder having a rectifying blade. The electromagnetic proportional control valve according to claim 1. 3. The electromagnetic proportional control valve according to claim 1, wherein a pilot valve seat anti-adhesion groove formed radially is provided on an outer peripheral portion of the pilot valve seat on the back side of the hard disk. 4. The electromagnetic proportional control valve according to claim 1, wherein a protruding wall for preventing deformation of the pilot valve seat is provided on an outer peripheral portion of the groove for preventing adhesion of the pilot valve seat. 5. The electromagnetic proportional control valve according to claim 1, wherein a projection wall for preventing deformation of the pilot valve seat is provided on the guide case. 6. An electromagnetic proportional control valve according to claim 1, wherein a flow sensor is provided at an outlet of the valve body, and has at least a power supply + side cable, a power supply − side cable, and a required flow rate signal cable. An electric circuit board unit to which an external cable can be connected is attached, and a DC voltage applied to the solenoid is self-variable according to an output signal of the flow rate sensor, thereby automatically controlling an outflow flow rate to a required flow rate. Electromagnetic proportional control valve device.