JPH04113386U - solenoid valve - Google Patents

Abstract

(57) [Summary] [Purpose] A valve shaft is fixed to a movable core that faces a fixed core and is biased by a spring in a direction away from the fixed core, and can be seated on a fixed valve seat member having a valve hole. To easily improve the concentricity of a valve shaft and a valve seat member in a solenoid valve in which a valve body portion is provided at the tip of the valve shaft. [Structure] The valve seat member 18 has a fitting hole 1 coaxial with the valve hole 17.
8d, and a ring-shaped guide member 20 that guides the axial movement of the valve shaft 36 is fitted and fixed in the fitting hole 18d.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention has a spring that faces the fixed core and runs away from the fixed core. The valve stem is fixed to the biased movable core, and can be seated on a fixed valve seat member having a valve hole. The present invention relates to a solenoid valve in which a valve body portion is provided at the tip of a valve shaft.

0002

[Conventional technology]

Conventionally, such a solenoid valve has been disclosed in, for example, Japanese Unexamined Patent Publication No. 64-46080. are already known.

0003

[Problem that the idea aims to solve]

By the way, the above-mentioned conventional valve has a valve body portion at the tip that can be seated on the valve seat member. The valve shaft is guided by a guide member fixed to a member that is separable from the valve seat member. Therefore, unless the machining accuracy of each part of the solenoid valve is improved, the axis of the guide member will be at the valve seat. It may not match the valve hole axis of the material accurately, causing problems with sealing performance when the valve body is seated. be.

0004 The present invention was made in view of the above circumstances, and the valve stem and valve seat members are the same. It is an object of the present invention to provide a solenoid valve whose centrality can be easily improved. .

[0005]

[Means to solve the problem]

In order to achieve the above object, according to the first feature of the present invention, the valve seat member includes a valve seat member. A fitting hole coaxial with the hole is provided, and a ring is provided in the fitting hole to guide the axial movement of the valve shaft. A shaped guide member is fitted and fixed.

[0006] Further, according to the second feature of the present invention, the valve seat member includes a guide member for guiding the axial movement of the valve shaft. A guide hole is drilled coaxially with the valve hole.

[0007]

【Example】

Embodiments of the present invention will be described below with reference to the drawings.

[0008] FIG. 1 is a longitudinal sectional view of a solenoid valve according to a first embodiment of the present invention.

[0009] The casing 1 of this solenoid valve is a first casing made of magnetic metal such as iron-based metal. Consisting of a second case member 3 and a second case member 4 made of stainless steel or the like, which are coupled together. be done. The first case member 3 includes a first yoke portion 5 that is basically cylindrical, and a first yoke portion 5 that is basically cylindrical. It is integrally equipped with a cylindrical second yoke part 6 which is formed coaxially with the outer periphery of the part 5, A thin wall portion 8 is provided at the end of the second yoke portion 6 via a step portion 7 . Also the second case The member 4 is formed in a cap shape, and a second case is attached to the stepped portion 7 of the second yoke portion 6. With the outer peripheral edge of the base member 4 in contact with the outer peripheral edge, bend the thin wall portion 8 so as to cover the outer peripheral edge. The first and second case members 3, 4 are joined together by 1 will be configured.

0010 The central part of the first yoke part 5 in the first case member 3 is provided with a A first hole 11, a second hole 12, a third hole 13, and a fourth hole whose diameter increases inward in order. 14 are coaxially drilled with a step between them. Therefore, the second hole 12 has a first hole. a valve seat member 18 basically formed in a stepped cylindrical shape with a valve hole 17 coaxial with 11; is press-fitted and fixed. That is, the valve seat member 18 has a small diameter portion 1 corresponding to the second hole 12. 8a and a large diameter portion 18 that is smaller in diameter than the third hole 13 and larger in diameter than the small diameter portion 18a. b are coaxially connected, and between the small diameter part 18a and the large diameter part 18b. The small diameter is The portion 18a is press-fitted into the second hole 12. Moreover, the large diameter portion 18b of the valve seat member 18 A fitting hole 18d coaxial with the valve hole 17 is bored in the opening end of the fitting hole 18. A ring-shaped guide member 20 is press-fitted into the hole d. As a result, the valve seat member 18 has a valve hole. A valve chamber 19 is formed between the guide member 17 and the guide member 20. Also, the valve seat member 1 8 is provided with a passage 16 whose inner end communicates with the valve chamber 19 and which opens on the outer surface. An annular groove 21 is provided on the outer peripheral surface of the yoke portion 5 and communicates with the annular groove 21. At the same time, a communication passage 22 is bored in the inner surface of the third hole 13, and the guide member 20 has a A passage 20a communicating with the valve chamber 19 is bored. Therefore, the valve chamber 19 is connected to the passage 16, 20a and the communication path 22 to communicate with the annular groove 21.

[0011] A first yoke is provided between the first yoke portion 5 of the first case member 3 and the second case member 4. In order from the part 5 side, a coil 24 wound around a bobbin 23 and having a cylindrical shape, and an iron A third yoke portion 9 formed in a ring shape from a magnetic metal such as a magnetic metal is sandwiched therebetween. That is, the first and third yoke parts 5 and 9 are arranged on both sides of the coil 24 in the axial direction, The coil 24 will be surrounded by the second yoke part 6.

0012 The first and third yoke parts 5 and 9 are coaxial with the second yoke part 6 and are located inside the coil 24. They are connected via a connecting cylinder 25 disposed in the , made of a non-magnetic material such as stainless steel in a cylindrical shape, and a first yoke. A non-magnetic cylindrical body 26 whose one end is fitted into the fourth hole 14 of the part 5, and a magnetic material such as an electromagnetic material. It is formed of soft iron into a cylindrical shape with the same inner and outer diameters as the non-magnetic cylinder 26, and a third joint. The iron part 9 and the magnetic cylinder 27 fitted into the second case member 4 are coaxially coupled. It is what it is. Thus, the opposite ends of the non-magnetic cylinder 26 and the magnetic cylinder 27 have mutually opposite ends. Fitting cylinder parts 26a and 27a that can be fitted to the fitting cylinder part 26a and 27a are respectively provided. a, 27a are fitted into each other to form a non-magnetic cylinder 26 and a magnetic cylinder 27 which are coaxially connected. It is held between the first yoke part 5 and the second case member 4. Moreover, the non-magnetic cylinder 26 , is formed to have a length that covers almost the entire length along the axial direction of the coil 24. Ru.

[0013] The end of the connecting cylinder 25 on the second case member 4 side is made of magnetic metal such as iron-based metal. A fixed core 28 formed in a bottom cylindrical shape is fitted with its closed end facing outward in the axial direction. , the outer surface of the fixed core 28 is in contact with the inner surface of the magnetic cylinder 27 in the connecting cylinder 25. A sealing member 29 is fitted. Also, the combination of the non-magnetic cylinder 26 and the magnetic cylinder 27 A sealing member 30, 31 are fitted respectively, and these seal members 29 to 31 connect the connecting cylinder. A seal is established between the inside of 25 and the outside.

[0014] The space between the valve seat member 18 and the fixed core 28 in the connecting cylinder 25 is made of iron-based metal. A movable core 32 is housed so as to be movable in the axial direction. In addition, the fixed core 28 has a cylindrical shape. A guide member 34 is fitted and fixed, and an inner surface of the guide member 34 is provided to allow fluid circulation. A plurality of grooves 34a, for example four, are provided.

[0015] The movable core 32 has a valve shaft 36 with both ends protruding from both axial ends of the movable core 32. The tip of the valve shaft 36 (the upper end in FIG. 1) is a guide. The valve seat member is inserted into the valve chamber 19 so as to be guided in its axial movement by the member 20. A spherical valve body portion 37 that can close the valve hole 17 by seating on the valve shaft 36 is provided at the tip of the valve shaft 36. I get kicked. Further, the rear end portion of the valve shaft 36 is guided in its axial movement by the guide member 34. and inserted into the fixed core 28. Moreover, when moving in the axial direction, the movable core 32 has a A plurality of communication holes 38 are drilled along the entire length in the axial direction to allow fluid to flow through the There is.

[0016] By the way, between the movable core 32 and the fixed core 28, the movable core 32 and the fixed core Due to the influence of residual magnetism caused by direct contact with the fixed core 28 of the movable core 32, Made of non-magnetic material to avoid slowing down the operating speed in the direction away from the A thin annular stopper 39 is interposed, and the stopper 39 and the guide member 3 A return spring 35 that biases the movable core 32 in a direction away from the fixed core 28 is provided between the It will be reduced.

[0017] Next, to explain the operation of this first embodiment, when the coil 24 is demagnetized, it is movable. The core 32 is in a position separated from the fixed core 28 by the spring force of the return spring 35, The valve body portion 37 is seated on the valve seat member 18 and is in a closed state in which the valve hole 17 is closed. this When the coil 24 is excited with the valve closed, the fixed core 28, magnetic cylinder 27, and third yoke 9. A magnetic circuit is formed via the second yoke part 6, the first yoke part 5, and the movable core 32. The movable core 32 is attracted to the fixed core 28, and the valve body portion 37 is removed from the valve seat member 18. By separating them, the valve hole 17 can be opened and an open state can be obtained.

[0018] In such a solenoid valve, a guide member that guides the axial movement of the valve shaft 36 20 is press-fitted into the fitting hole 18d of the valve seat member 18. Therefore, the valve hole 17 and the fitting Since the mating hole 18d can be machined simultaneously, the concentricity of the valve hole 17 and the mating hole 18d can be adjusted. It is easy to make it higher. Therefore, the guide portion press-fitted into the fitting hole 18d The concentricity between the material 20 and the valve hole 17 is also increased, and the valve at least near the valve seat member 18 is The axial movement of the shaft 36 is accurately aligned with the axis of the valve hole 17 in the valve seat member 18. The sealing performance when the valve body portion 37 is seated on the valve seat member 18 can be improved.

[0019] In the above embodiment, when the coil 24 is in a demagnetized state, the valve hole 17 is connected to the valve body portion 37. However, in the present invention, the coil 24 is closed as in the second embodiment shown in FIG. A normally open solenoid in which the valve body 37 opens the valve hole 17 when the demagnetized state is achieved. It is also applicable to idle valves. That is, at the lower end of the connecting cylinder 25, the connecting cylinder A bottomed circle is formed of a non-magnetic material with a sealing member 29 on the outer surface that contacts the inner surface of the body 25. A lid member 41 formed in a cylindrical shape is fitted, and the upper part of the connecting cylinder 25 and the first yoke part A fixed core 28', which is basically formed in a cylindrical shape, is fitted into the fifth hole 15 of No. 5 and fixed. It will be done. The valve shaft 36 passes through the fixed core 28' so as to be freely movable in the axial direction, and 0 and the lid member 41 to guide the axial movement. Also, the return spring 35 A stopper 39 that comes into contact with the end surface of the fixed core 28' and the movable core 32 on the fixed core 28' side. It is contracted between. In addition, fluid flows through the inner surfaces of the fixed core 28' and the lid member 41. A plurality of grooves 28'a, 41a, for example four, are provided to allow passage.

[0020] Even in such a normally open solenoid valve, the above-mentioned normally closed solenoid valve has a You can obtain the same effect as the previous one.

[0021] As a third embodiment of the present invention, as shown in FIG. A guide hole 43 for guiding the valve shaft 36 is provided coaxially with the valve hole 17 in the guide portion 20'. In this case, the inner surface of the guide hole 43 has a groove that meets the outer surface of the valve shaft 36. A groove 42 is provided therebetween to form a passage for allowing flow of hydraulic oil.

[0022] According to this third embodiment, the valve hole 17 and the guide hole 43 are simultaneously machined to improve coaxial accuracy. The axial movement of the valve stem 36 can be accurately aligned with the axis of the valve hole 17. In this way, the sealing performance of the valve body portion 37 when seated can be improved.

[0023]

[Effect of the idea]

As described above, according to the first feature of the present invention, the valve seat member has a coaxial fitting with the valve hole. A hole is provided in the fitting hole, and a ring-shaped guide member that guides the axial movement of the valve shaft is provided in the fitting hole. Since they are fitted and fixed, it is easy to increase the concentricity of the valve hole and the fitting hole. This improves the coaxial precision of the guide member and valve hole when the valve body is seated on the valve seat member. can improve the sealing performance.

[0024] Further, according to the second feature of the present invention, the valve seat member includes a guide member for guiding the axial movement of the valve shaft. Since the guide hole is drilled coaxially with the valve hole, the concentricity of the valve hole and guide hole can be increased. This improves the sealing performance when the valve body is seated on the valve seat member. be able to.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a solenoid valve according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a solenoid valve according to a second embodiment of the present invention.

FIG. 3 is a vertical sectional view of a solenoid valve according to a third embodiment of the present invention.

[Explanation of symbols]

17... Valve hole 18, 18'...Valve seat member 18d...Fitting hole 20...Guide member 28...Fixed core 32...Movable core 36... Valve stem 37...Valve body part 43... Guide hole

Claims (2)

[Scope of utility model registration request] 1. A valve shaft (36) is fixed to a movable core (32) that faces a fixed core (28) and is biased by a spring in a direction away from the fixed core (28),
In a solenoid valve in which a valve body (37) that can be seated on a fixed valve seat member (18) having a valve hole (17) is provided at the tip of a valve shaft (36), the valve seat member (18) has a valve hole (17). ) is provided with a fitting hole (18d) coaxial with the fitting hole (18d).
d) A solenoid valve characterized in that a ring-shaped guide member (20) that guides the axial movement of the valve stem (36) is fitted and fixed. 2. A valve shaft (36) is fixed to a movable core (32) facing the fixed core (28) and biased by a spring in a direction away from the fixed core (28), and the valve hole (1
In a solenoid valve in which a valve body portion (37) that can be seated on a fixed valve seat member (18') having a valve seat member (18') is provided at the tip of a valve stem (36), the valve seat member (18') (3
The guide hole (43) that guides the axial movement of the valve hole (1)
7) A solenoid valve characterized by being bored coaxially with the valve.