JPH0579155U - solenoid valve - Google Patents

Abstract

(57) [Summary] [Purpose] To ensure sufficient quietness when the solenoid valve operates. [Structure] The bottom portion 2 is provided on one end side of the bobbin 13 of the solenoid 3.
0 and a flange 22 are provided, and the valve chamber 8 is formed by the bottom portion 20, the flange 22 and the main body 2. A diaphragm 23 is provided in the valve chamber 8, and a plunger 26 is housed inside a valve portion 25 located at the center of the diaphragm 23. Valve 2
A gap d is provided between the inner peripheral wall 8 a of the valve chamber 8 and the inner peripheral wall 8 a of the valve chamber 8. When the plunger 26 operates, the plunger 26 is prevented from abutting or sliding contact with the inner peripheral wall 8a of the valve chamber 8, and also abuts the valve seat 11 and the bottom portion 20 via the valve portion 25.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a solenoid valve used for air flow rate control.

[0002]

[Prior Art]

 Conventionally, as a solenoid valve used for air flow rate control, there is one shown in FIG. That is, the solenoid valve 31 has a resin main body 32, and a solenoid 33 is provided on one end side of the main body 32. The main body 32 is integrally formed with a first port 34 and a second port 35, and a valve chamber 36 that communicates the ports 34 and 35 with each other. A valve seat is provided at one end of the valve chamber 36. The seat 37 is projected. A yoke 38 is embedded on the solenoid 33 side of the main body 32. On the other hand, the solenoid 33 is integrally molded with the main body 32 and constitutes the other end of the valve chamber 36, the bobbin 39, the coil 40 wound around the bobbin 39, and the central portion of the bobbin 39. And a metal core 41, and a stopper 42 is integrally formed at the end of the core 41 located inside the valve chamber 36.

A cylindrical guide 49 is fitted in the valve chamber 36, and a plunger 43 as a valve body is slidably fitted in the guide 49. A hole 44 is penetrated through the center of the shaft of the plunger 43 and a fluorine rubber 45 is filled in the hole 44. With this fluorine rubber 45, a recess 46 is formed at one end of the plunger 43, and another end is formed at the other end. The valve body 47 is formed so as to contact the seat 37. The plunger 43 is urged toward the seat 37 by a spring 48 that is contracted between the plunger 43 and the core 41.

In such a structure, the plunger 43 is reciprocated in the valve chamber 36 by the electromagnetic force of the solenoid 33 and the elastic force of the spring 46, and the valve portion 45 is brought into contact with and separated from the seat 37. The fluid flow path in the main body 32 is opened and closed. In this case, the stroke of the plunger 43 is restricted by contact between the fluorine rubber 45 and the stopper 42 of the core 41, and contact between the valve body 47 formed by the fluorine rubber 45 and the seat 37. Therefore, when the stroke is regulated, it is possible to reduce the impact noise generated at both ends of the plunger 43 in the operation direction, and it is possible to improve the quietness when the solenoid valve 31 is operated.

[0005]

[Problems to be solved by the device]

 However, in such a conventional solenoid valve 31, since the plunger 43 slides in the guide 49 during its operation, the outer peripheral surface of the plunger 43 and the guide 49 are accompanied by the operation of the plunger 43. A sliding noise is generated by the inner peripheral surface of the plunger 43, and a rattling noise of the plunger 43 is also generated because a clearance must be provided between the plunger 43 and the guide 49. Therefore, even if the impact sound at both ends in the operating direction of the plunger 43 could be reduced to a slight level, it was not yet possible to secure sufficient quietness.

The present invention has been made in view of such a situation as described above, and it is possible to prevent the generation of sliding noise and rattling noise during the operation of the valve body to ensure sufficient quietness. The purpose is to provide a solenoid valve.

[0007]

[Means for Solving the Problems]

 In order to solve the above problems, in the present invention, a valve element is housed between a valve seat and a stopper provided in a valve chamber, the valve element is biased in one direction, and the electromagnetic force of a solenoid is applied. In an electromagnetic valve that is operated in the other direction by means of a valve body and opens and closes a fluid path by reciprocating the valve body, the valve body is movably supported in the valve chamber via a support member formed of an elastic body. At the same time, both ends of the valve element in the operating direction are covered with the supporting member. Further, it is preferable that the supporting member is a diaphragm, and further, it is preferable that the bobbin forming the solenoid is integrally provided with the stopper.

[0008]

[Action]

 In the above structure, since the valve body is movably supported in the valve chamber via the support member, it is possible to increase the gap between the valve body and the inner peripheral wall of the valve chamber, and the valve body reciprocates when the valve body reciprocates. It is possible to prevent the sliding contact with the inner peripheral wall of the chamber and the contact with the inner peripheral wall of the valve chamber. Also, when the valve element during reciprocating operation is restricted from moving in one direction or the other direction by contacting both ends in the operating direction with the valve seat or stopper, in such a case, both ends in the operating direction of the valve element are It is covered by the support member formed of an elastic body, and contacts the valve seat or the stopper via the support member. Further, when the support member is a diaphragm, the valve body can be easily covered by integrating the valve body and the diaphragm in molding the diaphragm. Furthermore, when the stopper is provided integrally with the bobbin that constitutes the solenoid, the bobbin that is a non-magnetic material can restrict the movement of the valve element in one direction or the other direction.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIGS. 1 and 2, the solenoid valve 1 of the present invention has a resin main body 2 and a solenoid 3 located at one end side of the main body 2 as in the one shown in FIG. ing. The main body 2 has a first nozzle 5 forming a first port 4 and a second nozzle 7 forming a second port 6, which are integrally formed on the outer peripheral portion and the other end portion thereof, At one end of the main body 2, a valve chamber portion 9 that constitutes the valve chamber 8 and has the first port 4 and the second port 6 opened is opened. A seat portion 10 formed at the opening of the second port 6 is projectingly provided in the valve chamber portion 9, and a valve seat 11 is formed at the opening edge of the seat portion 10. A yoke 12 is embedded inside the main body 2 so as to surround the valve chamber 9, and a part of the yoke 12 is projected to the outer periphery of the main body 2.

On the other hand, the valve chamber 9 is closed by the solenoid 3. The solenoid 3 has a resin bobbin 13, a coil 14 wound around the bobbin 13, a metal core 15 inserted into the bobbin 13, and a resin mold 16 surrounding these. The mold 16 is provided with a terminal 17 connected to the coil 14. One end of the core 15 is exposed to the outside from one end of the bobbin 13 and is connected to the yoke 12 via a metal bracket 18.

The bobbin 13 has a cylindrical portion 19 for accommodating the core 15, and a bottom portion 20 which is a stopper is formed at the lower end portion of the cylindrical portion 19. A surface of the bottom portion 20 facing the main body 2 is formed in a tapered shape, and a hole 21 is opened in a central portion thereof, and an opening edge 21a of the hole 21 faces the main body 2. It stands out. Further, a flange 22 is formed at the lower end edge of the cylindrical portion 19 so as to project from the cylindrical portion 19 in the outer peripheral direction thereof and to form the valve chamber 8 together with the bottom portion 20. The flange 22 and the main body 2 are formed. A diaphragm 23, which is a support member, is sandwiched between and. The diaphragm 23 is molded from a resin material having elasticity, and has a disc portion 24 and a valve portion 25 that is formed by projecting on both sides of the disc portion 24 at the central portion of the disc portion 24. A plurality of holes 24a are opened in the portion 24. Further, the valve portion 25 is formed with an annular convex portion 25 a that is in contact with the valve seat 11 at the peripheral edge of the end surface facing the valve seat 11. A gap d exists between the valve portion 25 and the inner peripheral wall 8a of the valve chamber 8.

In addition, the valve portion 25 of the diaphragm 23 accommodates a plunger 26 made of a magnetic material which is a valve body and constitutes a magnetic circuit together with the core 15, the bracket 18 and the yoke 12 described above. The plunger 26 is integrated with the diaphragm 23 when the diaphragm 23 is molded by a mold, and the periphery thereof is covered by the valve portion 25, while the plunger 26 is in the operating direction located on the solenoid 3 side. Only the central portion on one end side is exposed from the valve portion 25. Further, the plunger 26 has a hole 27 which is opened in a portion exposed from the valve portion 25. The plunger 26 is accommodated in the hole 27 and is contracted by a spring 28 which is compressed between the solenoid 15 and the core 15. It is biased toward the valve seat 11.

In the above structure, the plunger 26 is housed in the valve portion 25 of the diaphragm 23 so that the plunger 26 can move freely within the valve chamber 8. When the solenoid 3 is excited, the plunger 26 moves its electromagnetic field. The force causes the diaphragm 23 to bend and moves toward the solenoid 3 side (opening direction). When the solenoid 3 is in the non-excited state, the plunger 26 is deflected by the repulsive force of the spring 28 in the opposite direction and moves toward the valve seat 11 (close direction). At this time, the plunger 26 is restricted from moving in the opening direction by contacting with the bottom portion 20 of the bobbin 13 and restricted from moving in the closing direction by contacting with the valve seat 11. Since it is covered by the valve portion 25 of the resin diaphragm 10 having elasticity, it comes into contact with the bobbin 13 and the valve seat 11 via the valve portion 25. Therefore, the impact sound at both ends of the plunger 26 in the operating direction becomes extremely small.

Moreover, since the plunger 26 is supported in the valve chamber 8 by the diaphragm 23, the gap d between the plunger 26, that is, the valve portion 25 and the inner peripheral wall 28a of the valve chamber 8 can be increased. it can. Therefore, if the gap d is as large as necessary, it is possible to prevent the inner peripheral wall 28a and the valve portion 25 from slidingly contacting or abutting each other. Therefore, not only the impact sound when the plunger 26 is actuated as described above can be made slight, but also the generation of sliding noise and rattling sound accompanying the actuation of the plunger 26 can be prevented, and the operation of the solenoid valve 1 can be prevented. It is possible to secure sufficient quietness in time.

Further, since the bottom portion 20 is provided on the resin bobbin 13 and the bottom portion 20 is brought into contact with the bottom portion 20, the movement of the plunger 26 in the opening direction is regulated. The impact sound can be further reduced as compared with the case of abutting on the core. Further, in this embodiment, the opening edge 21a of the hole 21 opened in the bottom portion 20 is projected toward the valve seat 11 side so that the bottom portion 20 and the valve portion 25 of the diaphragm 23 come into contact with each other. The area is reduced, and this also reduces the impact sound that occurs when the two abut each other.

On the other hand, in the solenoid valve 1, the diaphragm 23 is used as the support member for movably supporting the plunger 26 in the valve chamber 8. Therefore, when the diaphragm 23 is molded, the plunger 26 and the diaphragm 23 are integrated with each other. The plunger 26 can be easily covered by the change. Moreover, in that case, by integrating the plunger 26 and the diaphragm 23, the man-hours for assembling the solenoid valve 1 can be reduced, and the positioning work for the plunger 26 and the valve seat 11 can be eliminated. Although not shown, a bellows or the like may be used as a supporting member instead of the diaphragm 26.

[0017]

[Effect of the device]

 As described above, the present invention accommodates the valve element between the valve seat and the stopper provided in the valve chamber, urges the valve element in one direction, and actuates it in the other direction by the electromagnetic force of the solenoid. In a solenoid valve that opens and closes a fluid path by reciprocating operation of the valve body, the valve body is movably supported in a valve chamber via a support member formed of an elastic body, and both ends of the valve body in the operating direction are supported by the support member. Since it is covered with a member, not only is the impact noise generated during the reciprocating operation of the valve disc minimal, but the gap between the valve disc and the inner peripheral wall of the valve chamber is set to a large value so that the valve disc It is possible to prevent the generation of sliding noise and rattling noise. Therefore, it is possible to secure sufficient quietness when the solenoid valve operates.

Further, since the support member is a diaphragm, the valve body can be easily covered with the diaphragm by integrating the valve body and the diaphragm when molding the diaphragm. Moreover, by integrating the valve body and the diaphragm, the number of assembling steps of the solenoid valve can be reduced, and the positioning work for the valve body and the valve seat can be eliminated.

Furthermore, since the bobbin forming the solenoid is integrally provided with the stopper, the impact sound generated during the reciprocating operation of the valve body is smaller than that in the case where the stopper is the core forming the solenoid. Therefore, it is possible to further improve the quietness during the operation of the solenoid valve.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG. 1 showing the same embodiment.

FIG. 3 is a cross-sectional view showing a conventional example.

[Explanation of symbols]

 1 Solenoid Valve 3 Solenoid 8 Valve Chamber 11 Valve Seat 13 Bobbin 20 Bottom Part (Stopper) 23 Diaphragm (Supporting Member) 26 Plunger (Valve)

Claims (3)

[Scope of utility model registration request] 1. A valve body is accommodated between a valve seat and a stopper provided in a valve chamber, the valve body is biased in one direction and is actuated in the other direction by electromagnetic force of a solenoid, In the solenoid valve that opens and closes the fluid path by reciprocating operation,
The valve body is movably supported in the valve chamber via a support member formed of an elastic body, and both ends in the operating direction of the valve body are covered with the support member. valve. 2. The solenoid valve according to claim 1, wherein the support member is a diaphragm. 3. The bobbin forming the solenoid is integrally provided with the stopper.
Alternatively, the solenoid valve described in 2.