JP4126543B2 - solenoid valve - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electromagnetic valve that is a kind of valve device, and more specifically, has a structure in which a rubber-like elastic seal portion of a valve body is pressed against a valve seat by a pilot input pressure input to a valve chamber when the valve is closed. The present invention relates to a pilot type solenoid valve.
[0002]
[Prior art]
Conventionally, as shown in FIG. 4, an electromagnetic valve 51 that opens by energizing the solenoid 52 and closes by releasing the excitation is pressed by the return spring 53 when the valve is closed, and the fixed iron core is pressed. The movable iron core 55 moving in the direction away from 54 (the vertical direction in the figure) and the pilot input pressure input to the valve chamber 58 through the pilot hole 57 from the inflow port 56 side close the valve body 59 in the valve closing direction (the vertical direction in the figure). A pilot-type electromagnetic valve 51 having a structure that is closed by pressing a rubber-like elastic seal portion 60 that forms a part of the valve body 59 against the valve seat 61 is known (see Patent Document 1). ).
[0003]
However, according to this conventional solenoid valve 51, when the pilot input pressure input to the valve chamber 58 is high when the valve is closed, the rubber-like elastic seal portion 60 of the valve body 59 is applied to the valve seat 61 by this high pressure. When pressed strongly and sinks deeply due to its elasticity, the size of the gap 62 between the fixed iron core 54 and the movable iron core 55 is larger than the set value. And when the situation where the magnitude | size of the space | gap 62 exceeds a setting value occurs in this way, since the suction force of the solenoid part 52 required at the time of valve opening operation must be set large in preparation for this, the solenoid part It is inconvenient because the size of 52 must be increased or the power consumption of the solenoid unit 52 must be increased. Further, a measure to suppress the sinking by increasing the hardness of the rubber-like elastic seal portion 60 pressed against the valve seat 61 is conceivable. In this case, the rubber-like elastic seal portion 60 against the valve seat 61 is also conceivable. Since the seating posture becomes unstable, the low-pressure sealing performance is lowered.
[0004]
[Patent Document 1]
JP-A-8-145226 [Patent Document 2]
JP-T-2001-521211 gazette
[Problems to be solved by the invention]
In view of the above, the present invention provides a pilot-type solenoid valve having a structure in which a rubber-like elastic seal portion of a valve body is pressed against a valve seat by a pilot input pressure, even when the pilot input pressure is high. It is an object of the present invention to provide an electromagnetic valve capable of preventing a gap between a fixed iron core and a movable iron core from expanding without causing a seal portion made of an elastic body to be strongly pressed against a valve seat and sinking.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a solenoid valve according to claim 1 of the present invention is a pilot having a structure in which a rubber-like elastic seal portion of a valve body is pressed against a valve seat by a pilot input pressure inputted to the valve chamber when the valve is closed. In the solenoid valve, the valve body has a displacement amount restricting portion for restricting a valve closing direction displacement amount to a certain amount, and the displacement amount restricting portion is a resin provided in a valve hole inside the valve seat or the like It has a stopper receiving portion made of a rigid material and a stopper contacting portion made of a rigid material such as a resin provided on the valve body so as to contact the stopper receiving portion.
[0007]
According to a second aspect of the present invention, there is provided the electromagnetic valve according to the first aspect, wherein the valve body includes a rubber-made elastic diaphragm installed inside the body, a resin attached to the diaphragm, and the like. A rigid center plate, wherein the diaphragm is provided with the seal portion and the center plate is provided with the stopper contact portion.
[0008]
In the electromagnetic valve according to the first aspect of the present invention having the above-described configuration, when the pilot input pressure is high, the high pressure strongly presses the rubber-like elastic seal portion of the valve body against the valve seat to sink. Then, the displacement amount restricting portion is operated, and the stopper contact portion comes into contact with the stopper receiving portion, thereby stopping the displacement of the valve body in the valve closing direction. Therefore, after the displacement limiter is actuated by the stopper, the valve body is not displaced further in the valve closing direction, so that the rubber-like elastic seal part of the valve body is prevented from being strongly pressed against the valve seat and sinking. It becomes possible.
[0009]
As the structure of the displacement amount limiting portion, as described above, a stopper receiving portion made of a rigid material such as resin provided in the valve hole inside the valve seat, and a resin provided on the valve body so as to come into contact with the stopper receiving portion, etc. It is preferable to use a combination with the stopper contact portion made of a rigid material. According to this structure, since the displacement amount limiting portion is arranged at the center of the plane of the valve body having the largest displacement amount, the stopper setting is made. It is possible to provide a margin.
[0010]
According to the present invention, the rubber-like elastic seal portion is prevented from sinking. As described in claim 2, the valve element is attached to the diaphragm, and the rubber-made elastic diaphragm is installed inside the body. It can be applied to a solenoid valve of a type that has a center plate made of a rigid material such as resin and has a seal portion on the diaphragm and a stopper contact portion on the center plate. (For example, a type in which the rubber-like elastic seal part seated on the valve seat is not constituted by a diaphragm but is constituted by a valve body component separate from the diaphragm as shown in FIG. 4, a valve chamber partition part As a type that uses a slide piston-like part instead of a diaphragm as a self-holding type with a permanent magnet for holding a movable core To the solenoid valve can be applied.
[0011]
The present application includes the following technical matters.
[0012]
That is, in order to achieve the above object, one electromagnetic valve proposed by the present application has the following contents.
[0013]
(1) The rubber seal part of the solenoid valve is pressed against the valve seat on the body side by pressure and sinks, and as a measure to prevent the gap between the fixed iron core and the movable iron core from expanding, the body does not sink to the extent that a seal can be secured. Decided to provide a stopper mechanism.
(2) Even if the diaphragm is pressed by pressure, the center plate on which the diaphragm is assembled hits the stopper provided on the body, so that the diaphragm does not sink further. Prevents the spread.
(3) The stopper is installed at a location that does not affect the sealing performance of the body valve seat.
(4) The subsidence prevention structure of the present invention is applied to an electromagnetic valve for turning on and off a fluid, and is applied to an electromagnetic valve having other functions. Moreover, this structure is applied not only to a diaphragm seal mechanism but also to an electromagnetic valve of a rubber seal mechanism in which a valve seat is provided on the body. The stopper mechanism is not a structure in which the resins are brought into contact with each other, and includes the suppression of rubber sinking due to pressure by applying a rubber seal to a body stopper in a portion other than the valve seat to increase the contact area.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 shows a cross section of a solenoid valve 1 according to an embodiment of the present invention. The electromagnetic valve 1 according to this embodiment is a pilot-type opening / closing operation valve that opens by the excitation of the solenoid unit 2 and closes by releasing the excitation (demagnetization). The solenoid valve 1 is configured as follows. ing.
[0016]
That is, the electromagnetic valve 1 is roughly divided into a solenoid part 2 on the upper side in the figure and a valve part 3 on the upper and lower side in the figure.
[0017]
The former solenoid portion 2 is first provided with a cylindrical non-magnetic bobbin 4, and an electromagnetic coil 5 is wound around the outer periphery of the bobbin 4. The coil 5 is integrated with the bobbin 4 by a mold resin 6 and is surrounded by a magnetic frame 7.
[0018]
A cylindrical guide portion 8a of an interior member 8 made of a non-magnetic material is inserted on the inner peripheral side of the bobbin 4, and a fixed iron core 9 is fitted and fixed on the inner peripheral side, and a movable iron core 10 is illustrated. It is inserted so that it can reciprocate up and down.
[0019]
A packing 11 made of an O-ring or the like for sealing the portion is provided between the cylindrical guide portion 8a and the fixed iron core 9. Between the fixed iron core 9 and the movable iron core 10, the movable iron core 10 is vertically moved. A return spring 12 made of a coil spring or the like that elastically biases in the direction (valve closing direction) is provided. Further, a pilot valve body (also referred to as valve body rubber) 13 made of a rubber-like elastic body made of rubber or soft resin is provided at the lower end portion of the movable iron core 10.
[0020]
On the other hand, the latter valve portion 2 is provided with a body (also referred to as a valve body) 14 having an inflow port 15, a valve chamber 16, a valve seat (also referred to as a body valve seat portion) 17, a valve hole 18 and an outflow port 19. The valve body 20 is inserted into the body 14 so as to be displaceable in the vertical direction in the figure.
[0021]
The valve body 20 has a rubber-like elastic diaphragm 21 made of rubber or soft resin, and a rigid center plate 22 made of hard resin or the like held by the diaphragm 21.
[0022]
The diaphragm 22 is installed inside the body 14 so as to partition the inflow port 15 and the valve chamber 16, and the valve chamber 16 and the outflow port 19, respectively. The diaphragm 22 is an annular thick wall sandwiched between the interior member 8 and the body 14. The mounting portion 21a, an annular thin flexible membrane portion 21b integrally formed on the inner peripheral side thereof, and a disk-shaped thick holding portion 21c integrally formed on the inner peripheral side thereof are integrally provided. The center plate 22 is integrated by insert molding or assembly within the thickness of the holding portion 21c, and a portion of the disc-like holding portion 21c disposed below the center plate 22 is a valve seat. The seal portion 21d is made of a rubber-like elastic body that is slidably seated on the member 17.
[0023]
The center plate 22 is integrally formed on a disc-shaped main body portion 22a embedded in the thickness of the diaphragm holding portion 21c, a shaft portion 22b integrally formed at the center of the plane, and an outer peripheral edge portion of the main body portion 22a. An annular upward convex portion 22c and a downward convex portion 22d integrally formed at one place on the circumference of the main body portion 22a are integrally provided.
[0024]
Of these, the shaft portion 22b is provided so as to protrude from the upper surface and the lower surface of the diaphragm holding portion 21c, and the first pilot hole 23 is provided in the inside thereof so as to penetrate in the vertical direction. A pilot valve seat 24 with which the pilot valve body 13 on the side of the movable iron core 10 abuts on and off is provided at the upper end of the shaft portion 22b. The first pilot hole 23 is closed by the pilot valve body 13 when the solenoid valve 1 is in the closed state, and opens when the solenoid valve 1 is in the open state. To communicate.
[0025]
The upward convex portion 22c is provided so as to protrude from the upper surface of the diaphragm holding portion 21c, and the upward convex portion 22c is the upper end portion of the upward convex portion 22c when the electromagnetic valve 1 is in the valve open state. Is provided in order to limit the amount of displacement of the valve body 20 in the valve opening direction to a certain amount by contacting the interior member 8. The upper end portion of the upward convex portion 22c has a notch-like communication portion 22e so that the outer peripheral side and the inner peripheral side of the upward convex portion 22c can be communicated even when the upper end portion is in contact with the interior member 8. The required number is provided.
[0026]
The downward convex portion 22d is provided so as to protrude from the lower surface of the diaphragm holding portion 21c, and the second pilot hole 25 is provided therein so as to penetrate in the vertical direction. The second pilot hole 25 is always open and allows the inflow port 15 and the valve chamber 16 to communicate with each other.
[0027]
In the above configuration, the solenoid valve 1 operates as follows.
[0028]
Initial posture ...
That is, first, FIG. 1 shows a valve closing state, which is the initial action posture of the electromagnetic valve 1, and in this valve closing state, the movable iron core 10 is pushed down by the elasticity of the return spring 12, and a pilot provided at the lower end thereof. The valve body 13 is pressed against the pilot valve seat 24 to close the first pilot hole 23. Further, the valve body 20 formed of the holding portion 21c of the diaphragm 21 and the center plate 22 is also pushed down by the elasticity of the return spring 12 through the movable iron core 10, so that the rubber elastic seal portion 21d of the valve body 20 is moved to the valve seat 17. Is pressed against. Therefore, the valve 1 is closed and no fluid flows. Further, since the high pressure on the inflow port 15 side flows into the valve chamber 16 above the valve body 20 as the pilot input pressure from the second pilot hole 25, the valve body 20 is pushed down by this high pressure, and is made of a rubber-like elastic body. The seal portion 21 d is pressed against the valve seat 17.
[0029]
Valve opening operation ...
When the solenoid 5 is excited by supplying power to the coil 5 from the valve closed state, a magnetic field is generated, so that the fixed iron core 9 magnetically attracts the movable iron core 10. Since the magnetic attraction force is set to be larger than the elasticity of the return spring 12, the movable iron core 10 moves upward in the figure (the valve opening direction) while pressing and retracting the return spring 12. When the movable iron core 10 moves upward, the pilot valve body 13 is separated from the pilot valve seat 24, whereby the first pilot hole 23 is opened, so that the high pressure in the valve chamber 16 is increased from the first pilot hole 23 to the outflow port 19 side. To flow. Therefore, since the pressure in the valve chamber 16 decreases, the valve body 20 is displaced upward due to the pressure difference from the inflow port 15 side. Accordingly, the rubber-like elastic seal portion 21d of the valve body 20 is separated from the valve seat 17, so that the valve is opened and the fluid flows from the inflow port 15 to the outflow port 19.
[0030]
Valve closing operation ...
When the power supply to the coil 5 is stopped and the excitation is released from the valve open state, the magnetic field disappears, so that the movable iron core 10 is returned downward (the valve closing direction) by the elasticity of the return spring 12. When the movable iron core 10 returns downward, the movable iron core 10 contacts the valve body 20 and presses the valve body 20 downward, so that the valve body 20 is displaced downward and the rubber shape of the valve body 20 is increased. The elastic seal portion 21d is seated on the valve seat 17 and closed. The rubber-like elastic seal portion 21 d is pressed against the valve seat 17 by the elasticity of the return spring 12. In addition, since the pilot valve body 13 at the lower end of the movable core 10 is seated on the pilot valve seat 24 at the upper end of the valve body 20 and closes the first pilot hole 23, the high pressure on the inlet port 15 side in the valve chamber 16 is the pilot input pressure. As a result, the pressure becomes high by flowing from the second pilot hole 25. Accordingly, since the inside of the valve chamber 16 becomes high pressure, the valve body 20 is pushed down by this high pressure, and the rubber-like elastic seal portion 21 d of the valve body 20 is strongly pressed against the valve seat 17.
[0031]
When the rubber-like elastic seal portion 21d of the valve body 20 is strongly pressed against the valve seat 17 in this way, as explained in the above-mentioned prior art section, particularly when the pilot input pressure to the valve chamber 16 is high. The high pressure may cause the rubber-like elastic seal portion 21d of the valve body 20 to be strongly pressed against the valve seat 17 and sink deeply due to the elasticity. If this happens, the fixed iron core 9 and the movable core 9 are movable. The size of the gap 26 between the iron cores 10 will be larger than the set value. Therefore, in order to prevent this, the solenoid valve 1 is provided with the following measures to prevent the rubber-like elastic seal portion 21d from sinking.
[0032]
That is, the electromagnetic valve 1 is provided with a displacement amount restriction unit 27 that restricts the displacement amount of the valve body 20 in the valve closing direction to a certain amount, and this displacement amount restriction unit 27 is provided inside the valve seat 17. A receiving seat-like stopper receiving portion (also referred to as a body stopper portion) 28 made of a rigid material such as a hard resin provided in the valve hole 18 and the valve body 20 so as to come into contact with and separate from the stopper receiving portion 28. It is comprised by the protruding stopper contact part 29 which consists of rigid materials, such as provided hard resin.
[0033]
First of all, the stopper receiving portion 28 is provided as a single component formed of a rigid material such as resin, and the stopper receiving portion 28 which is a single component is an annular positioning step provided on the inner surface of the valve hole 18. The portion 18a is positioned and fitted from above. As shown in enlarged views in FIGS. 2 and 3, the stopper receiving portion 28 is formed integrally with a cylindrical mounting portion 28a that is positioned and fitted to the positioning step portion 18a, and an inner peripheral side of the mounting portion 28a. Further, a beam-shaped stopper receiver 28b having a flat cross shape is integrally formed, and a space between the mounting portion 28a and the stopper receiver 28b is formed as a flow path 28c penetrating in the vertical direction. Further, at the center of the upper surface of the flat cross-shaped stopper receiver 28b, the stopper receiver 28b does not block the first pilot hole 23 when the stopper contact portion 29 contacts the stopper receiver 28b. A groove-shaped communication portion 28d having a planar cross shape is provided. The cross shape of the stopper receiver 28d and the cross shape of the groove-like communication portion 28d are provided with an angular displacement of about 45 degrees on the plane.
[0034]
On the other hand, the stopper abutting portion 29 is constituted by the lower end portion of the shaft portion 22 b in the center plate 22 forming a part of the valve body 20, and the stopper abutting portion 29 is the stopper receiving portion 28 b of the stopper receiving portion 28. The displacement in the valve closing direction of the entire valve body 20 is stopped by contacting the upper surface of the valve body 20.
[0035]
Therefore, according to the electromagnetic valve 1 having the above-described configuration for preventing the sinking, that is, the displacement amount limiting portion 27, the stopper contact portion 29 made of a rigid material also contacts the stopper receiving portion 28 made of a rigid material. Since the displacement in the valve closing direction of the body 20 is stopped and the displacement in the valve closing direction of the valve body 20 is limited to a certain amount, the valve body 20 can be displaced in an appropriate amount by setting the displacement amount in the valve closing direction to an appropriate amount. Even when the pilot input pressure to the chamber 16 is high, it is possible to prevent the rubber-like elastic seal portion 21d of the valve body 20 from being strongly pressed against the valve seat 17 and sinking. Therefore, it is possible to prevent the gap 26 between the fixed iron core 9 and the movable iron core 10 from being enlarged, thereby ensuring the miniaturization and low power consumption of this kind of solenoid valve 1.
[0036]
In addition, since the displacement amount limiting portion 27 is disposed at the center of the plane of the valve body 20 having the largest displacement amount, it is possible to provide a margin for setting the stopper operation by the displacement amount limiting portion 27.
[0037]
Further, since the stopper receiving portion 28 disposed in the valve hole 18 inside the valve seat 17 has a beam-like stopper receiver 28b having a planar cross shape, the beam-like stopper receiver 28b provides a rectifying function. It can be demonstrated. In the above embodiment, four beams are provided in a radial shape, so that the shape is a plane cross. However, the number of beams is not limited, and three or less or five or more beams may be provided radially. .
[0038]
Furthermore, when the stopper receiving portion 28 and the stopper abutting portion 29 constituting the displacement amount limiting portion 27 restrict the flow path, the water hammer mitigating function can be exhibited by these.
[0039]
【The invention's effect】
The present invention has the following effects.
[0040]
That is, in the electromagnetic valve according to the first or second aspect of the present invention having the above-described configuration, the rubber-like elastic seal portion of the valve body is pressed against the valve seat by the pilot input pressure input to the valve chamber when the valve is closed. In a pilot type solenoid valve with a structure, even when the pilot input pressure is high, the rubber-like elastic seal of the valve body can be prevented from being strongly pressed against the valve seat and sinking. It is possible to prevent the gap between the iron core and the movable iron core from expanding. Therefore, it is possible to ensure a reduction in size and power consumption of this type of solenoid valve. In solenoid valves that supply water to the equipment from the water supply used for washing machines, hot water washing toilet seats, etc., static pressure may reach as much as 1.2 MPa in areas where the water pressure is high. The greatest effect of the present invention is that the electromagnetic valve for supplying water can be reduced in size and power consumption. In addition, in the electromagnetic valve according to claim 1 or 2 of the present invention configured as described above, since the displacement amount limiting portion is disposed at the center of the plane of the valve body having the largest displacement amount, the displacement amount limiting portion. It is possible to give a margin to the setting of the stopper operation by.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a solenoid valve according to an embodiment of the present invention. FIG. 2 is a single part view of a stopper receiving portion, in which (A) is a plan view and (B) is A in FIG. -A cross-sectional view taken along line A [Fig. 3] Similarly, a single view of the stopper receiving portion, (C) is a cross-sectional view taken along line BB in FIG. 2 (A), and (D) is a perspective view thereof. Sectional view of solenoid valve related to [Description of sign]
DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 Solenoid part 3 Valve part 4 Bobbin 5 Coil 6 Mold resin 7 Magnetic frame 8 Interior member 8a Cylindrical guide part 9 Fixed iron core 10 Movable iron core 11 Packing 12 Return spring 13 Pilot valve body 14 Body 15 Inflow port 16 Valve chamber 17 Valve seat 18 Valve hole 18a Positioning step portion 19 Outflow port 20 Valve body 21 Diaphragm 21a, 28a Mounting portion 21b Flexible membrane portion 21c Holding portion 21d Rubber elastic seal portion 22 Center plate 22a Main body portion 22b Shaft portion 22c Upward Convex portion 22d Downward convex portions 22e, 28d Communication portion 23 First pilot hole 24 Pilot valve seat 25 Second pilot hole 26 Gap 27 Displacement amount limiting portion 28 Stopper receiving portion 28b Stopper receiving 28c Flow path 29 Stopper contacting portion

Claims (2)

Pilot-type solenoid valve (1) having a structure in which the rubber-like elastic seal (21d) of the valve body (20) is pressed against the valve seat (17) by the pilot input pressure input to the valve chamber (16) when the valve is closed. In
A displacement amount restricting portion (27) for restricting a valve closing direction displacement amount of the valve body (20) to a certain amount;
The displacement amount limiting portion (27) is provided on a stopper receiving portion (28) made of a rigid material such as a resin provided in a valve hole (18) inside the valve seat (17), and the stopper receiving portion (28). A solenoid valve having a stopper abutting portion (29) made of a rigid material such as a resin provided on the valve body (20) so as to abut. The solenoid valve of claim 1,
The valve body (20) includes a rubber-made elastic diaphragm (21) installed inside the body (14), and a center plate (22) made of a rigid material such as a resin attached to the diaphragm (21). Have
The solenoid valve, wherein the diaphragm (21) is provided with the seal portion (21d) and the center plate (22) is provided with the stopper contact portion (29).

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