JPH08170751A - Solenoid valve - Google Patents

Abstract

PURPOSE: To provide a solenoid valve capable of precise opening/closing control by disusing a special supporting member for supporting a reciprocating valve disk to reduce the number of valve part items. CONSTITUTION: A movable element 17 to receive the electromagnetic attraction is fitted to the outer circumference of a poppet type columnar valve disk 11 consisting of the non-magnetic material. This valve disk 11 is slidably reciprocated between a first valve seat 5a of a first seat member 5 having a feeding port 21 and a second valve seat 6a of a second seat member 6 having a discharging port 23. A first communicating groove 15 and a second communicating groove 26 formed on the outer circumferential part of the valve disk 11 are communicated with an outlet port 22. The concentrical precision can be obtained by this axial hole making effective use of the axial holes of bodies 2, 3, and the smooth sliding of the valve disk 11 can be secured without necessitating the complicated machining.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve for controlling opening / closing of a fluid passage.

[0002]

2. Description of the Related Art As a prior art, the utility model Japanese Utility Model Laid-Open No. 3-125959
A 3-port solenoid valve disclosed in Japanese Patent Publication is known. In this device, bearings for supporting the rod in a sliding relationship are provided on one side and the other side in the axial direction of the rod forming the valve member, and a valve seat member having a communication hole is provided near the bearing. It is provided.

[0003]

[Problems to be Solved by the Invention] However, this actual Kaihei 3
According to the electromagnetic valve disclosed in Japanese Patent No. 125959, members for supporting the rod as one of the one end and the other end of the rod for realizing smooth sliding of the rod as a valve member are provided. Since it is necessary, the number of valve parts increases, the configuration becomes complicated and the assembly work becomes complicated,
There is a problem that the component cost and the assembly cost increase.

Further, in this conventional device, it is necessary to provide a plurality of axial holes or radial holes in the supporting member for supporting the rod as the valve body, which complicates hole processing and construction. In order to determine the coaxiality of the rod, there is a problem that the machining cost becomes high in that the outer diameter and the inner diameter of the support member are required to have a predetermined level of accuracy or more. The object of the present invention is to eliminate the support member for supporting the reciprocating valve body,
An object of the present invention is to provide a solenoid valve capable of performing precise opening / closing control by reducing the number of valve parts.

[0005]

An electromagnetic valve according to claim 1 of the present invention for achieving the above object comprises a mover for receiving an electromagnetic attraction force and a non-magnetic material attached to the outer periphery of the mover. A poppet-type valve body, a first body that directly pivotally supports one end of the valve body and has a first port, and a second body that directly pivotally supports the other end of the valve body and has a second port. A first seat member disposed in the first port and a second seat member disposed in the second port, wherein the first body has an outer periphery of the first seat member. A first communication hole that communicates with the first port and the third port when the valve body is seated on the second seat member while being in contact with the second seat member is provided, and the second body has an outer periphery of the second seat member. While contacting, the valve body is attached to the first seat member. Upon the seat, the said second port 3
A second communication groove for communicating the ports is provided.

The electromagnetic valve according to a second aspect of the present invention is characterized in that the first seat member is fitted in the cylindrical hole of the first body, and the second seat member is fitted in the cylindrical hole of the second body. To do. The electromagnetic valve according to claim 3 is provided with a hollow cylindrical collar between the first body and the second body, and the collar applies a fluid around the mover and an electromagnetic attraction force to the mover. It is characterized in that it is isolated from the coil.

A solenoid valve according to a fourth aspect of the present invention includes a push rod that contacts the valve body, a locking member that supports the push rod and is fixed to the second body, the push rod and the locking member. And an elastic member for urging the valve body via the push rod.

[0008]

According to the solenoid valve of the first aspect, when the valve body is seated on the first seat member, the second port and the third port are communicated with each other and the valve body is seated on the second seat member. For example, the first port and the third port are in communication. Therefore, since the first body and the second body directly and reciprocally support the valve body, a special support member for supporting the valve body can be eliminated, and precise opening / closing control of the fluid passage can be performed with a simple configuration. Further, by forming the first communication groove of the first body and the second communication groove of the second body so as to be open to the inner peripheral side, they can be easily formed by cold working or the like.

According to the solenoid valve of the second aspect, since the axial holes of the first body and the second body are used for fitting the seat member and supporting the valve body, there is no need for complicated machining. It is possible to ensure smooth sliding of the valve body. According to the solenoid valve of the third aspect, since the fluid around the mover and the coil that applies the electromagnetic attraction force to the mover are separated by the hollow tubular collar, the fluid pressure has a hollow tubular shape. It acts on the collar and prevents damage to the coil due to fluid pressure.

According to the electromagnetic valve of the fourth aspect, the valve element is pressed by the biasing force of the elastic member via the push rod, so that the valve element can be smoothly seated on the first seat member.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. In the solenoid valve 1, a first body 2 and a second body 3 are caulked and fixed, and a pipe-shaped first seat member 5 and a second seat member 6 coaxial with the first seat member 5 are provided inside the body. Between the first valve seat 5a of the first seat member 5 and the second valve seat 6a of the second seat member 6, a valve body 11 which is coaxially reciprocable is interposed. A bobbin 8 is provided around the outer periphery of the valve body 11 around which a coil 9 is wound to apply an electromagnetic attraction force to the valve body 11 in the left direction in FIG.

The solenoid valve 1 is a normally open three-way valve.
In FIG. 1, a supply port 21 and an output port 22 are formed in the first body 2, and a discharge port 23 is formed in the second body 3 coaxially with the supply port 21. This solenoid valve 1
Is composed of a valve section 12 and a drive section 13 for driving the valve section 12. In the state shown in FIG. 1, the valve body 11 is in the rightmost position.

The valve section 12 will be described. As shown in FIG. 1, FIG. 2 and FIG. 3, a pipe-shaped first sheet member 5 is inserted into the inside of the first body 2, and the first sheet member 5 is provided with a first sheet member 5 at an interval of 120 ° in the outer peripheral portion. A communication groove 15 is provided. The communication groove 15 extends in the axial direction on the outer peripheral portion of the first sheet member 5, and has one end near the output port 22 and the other end near the second communication groove 26 described later. The supply port 2 is provided at the inner end of the first sheet member 5.
A first valve seat 5a is formed which connects 1 and the first communication groove 15, and the first valve seat 5a is a portion on which the valve body 11 can be seated.

As shown in FIGS. 1 and 3, the second body 3
The pipe-shaped second sheet member 6 is inserted into the inside of the second sheet member 6, and the second communication grooves 26 are provided at 120 ° intervals in this case on the outer peripheral portion of the second sheet member 6. This second communication groove 26
Is located on an extension of the first communication groove 15, one end communicates with a space portion locked by a third cylindrical hole 31 described later, and the other end communicates with the discharge port 23. Second sheet member 6
A second valve seat 6a connecting the second communication groove 26 and the discharge port 23 is formed at the inner end of the second valve seat 6a.
Is a portion where the valve body 11 can be seated.

The valve body 11 has a columnar shape, and a first poppet valve portion 11a is formed in a spherical shape at one end portion of the valve body 11, and a second poppet valve portion 11b is formed at the other end portion. It is formed in a spherical shape. The valve body 11 is slidably guided in the left-right direction in FIG. 1 by a first cylindrical hole 29 formed in the first body 2 and a second cylindrical hole 30 formed in the second body 3. The third cylindrical hole 31 formed in the second body 3 forms a space portion that connects the first communication groove 15 and the second communication groove 26.

The main flow of the working fluid passes through the first communication groove 15 and the second communication groove 26, but the outer diameter of the valve body 11 and the inner diameters of the first cylindrical hole 29 and the second cylindrical hole 30 are the same. It is desirable that the clearance be slightly larger than the mesh size of the filter attached to the supply path of the working fluid (not shown) in order to prevent sticking due to foreign matter. For example, clearance: 0.13 mm <filter mesh size:
It is 0.1 mm.

The first communication groove 15 and the second communication groove 26 are
Those manufactured by so-called cold working are desirable in order to reduce the cost of parts. The first seat member 5 and the second seat member 6 are fixed by directly press-fitting into the respective diameters of the first cylindrical hole 29 and the second cylindrical hole 30 that support the poppet valve 11. This is the first
This is because if the sheet member 5 and the second sheet member 6 have different diameters, separate cylindrical holes are required and the processing cost rises.
Furthermore, the seating of the valve body 11 on the first seat member 5 and the second seat member 6 is to ensure the opening and closing of the valve on the same axis.

The fluid around the mover 17 is supplied to the output port 2
It communicates with 2, and has an output hydraulic pressure. In order to prevent the hydraulic pressure from being applied to the coil 9 and from leaking from the case to the outside of the solenoid valve 1, the collar 16 is fitted to the first body 2 and the second body 3 to prevent the fluid around the mover 17 from flowing. The pressure is prevented from acting on the bobbin 8. The drive unit 13 will be described.

A mover 17 is press-fitted and fixed to the outer peripheral portion of the valve body 11. An oil groove 17c is formed in the outer peripheral portion of the mover 17 so as to extend in the axial direction from the outer peripheral side of one end 17a of the movable element 17 in the axial direction to the outer peripheral side of the other end 17b. ing. A magnetic circuit portion 3a is formed on the outer peripheral portion of the mover 17 so as to extend in an annular shape in the axial direction from the central portion of the second body 3 via a gap. A second communication groove 26 that communicates with the discharge port 23 side from the inside of the cylindrical magnetic circuit portion 3a is formed.

As shown in FIG. 3, the collar 16 has a thin-walled tubular shape and has an outer peripheral portion of a fixed iron core portion 2a extending axially from the central portion of the first body 2 and an axial direction from the central portion of the second body 3. It is fitted and fixed to the outer peripheral portion of the magnetic circuit portion 3a extending in an annular shape. A bobbin 8 is provided on the outer peripheral portion of the collar 16, and a coil 9 is wound around the outer peripheral portion of the bobbin.
When the coil 9 is in the non-energized state, as shown in FIG. 1, the first communication groove 1 is supplied from the supply port 21 via the first valve seat 5a.
The valve body 11 is pushed to the right in FIG. 1 by the pressure of the fluid flowing into the valve 5, and the second poppet portion 11b is seated on the second valve seat 6a. As a result, the supply port 21 and the output port 22 communicate with each other. When the coil 9 is switched from the non-energized state to the coil 9 energized state, a magnetic circuit is formed and the electromagnetic attraction force generated by the magnetic circuit acts on the mover 17 to move the mover leftward in FIG. . As a result, the valve element 11 fixed to the mover 17 moves leftward. Then, the first poppet portion 11a is seated on the first valve seat 5a, and the output port 22
And the discharge port 23.

Next, the operation will be described. When the coil 9 is demagnetized, the second poppet valve portion 11b of the valve body 11 is seated on the second valve seat 6a of the second seat member 6, and the first poppet valve portion 11a is located on the first seat member 5 of the first seat member 5. 1 valve seat 5
It is separated from a. Therefore, the supply port 21 communicates with the output port 22 and is blocked from the discharge port 23.

When the coil 9 is excited, the first poppet valve portion 11a of the valve body 11 is seated on the first valve seat 5a of the first seat member 5, and the second poppet valve portion 11b is the second seat member. It is separated from 6a. Therefore, supply port 2
1 is cut off from the output port 22, and the output port 22 and the discharge port 23 are in communication with each other. The first cylindrical hole 29 and the second cylindrical hole 30 support the valve body 11 so as to smoothly move on the coaxial line when the demagnetized state changes to the excited state or when the excited state changes to the demagnetized state. Therefore, there is an effect that the responsiveness of switching the valve opening / closing is good.

According to this embodiment, the valve bodies 2 and 3 have the communicating grooves 15 and 26 extending in the axial direction, and the axial poppet type valve body 11 has the first cylindrical hole 29 and the second cylindrical hole. By supporting it on 30, a separate shaft supporting member can be eliminated, and smooth sliding of the valve element and a sufficient fluid circulation passage can be secured. Further, since the cylindrical hole is used for fitting the first sheet member 5 and the second sheet member 6, there is an effect that the processing cost becomes low.

(Second Embodiment) FIG. 5 shows a second embodiment of the present invention.
Shown in The second embodiment shown in FIG. 5 is an embodiment of a normally closed three-way valve. The fixed iron core portion 3a is arranged on the second body 3 side, and a magnetic circuit portion for flowing magnetic flux to the outer circumference of the mover 17 is provided on the first body 2 side.

The second communication groove 26 and the spring accommodating chamber 46 communicate with each other through the communication hole 45a of the second sheet member 45. The spring accommodating chamber 46 communicates with the outside through the discharge hole 44 of the locking member. The spring accommodating chamber 46 accommodates the compression coil spring 41 that urges the push rod 43 that pushes the valve element 11 to the left in FIG. 5, and one end of the compression coil spring 41 abuts on the push rod 43 and the other. The end is in contact with the locking member 47. Reference numeral 42 is a guide portion formed integrally with the locking member 47 and engaged with the push rod 43.

In the demagnetized state, the valve element 11 is pushed leftward in FIG. 5 against the supply pressure of the supply port 21 by the urging force of the compression coil spring 41, and the first valve seat 5a of the first seat member 5 is pushed. Since the first poppet valve portion 11 a of the valve body 11 is seated on the valve body 11, the valve body 11 is separated from the second seat member 45. According to this second embodiment, the valve bodies 2, 3
Has communicating grooves 15 and 26 extending in the axial direction inside, and by supporting the axial poppet type valve body 11 in the first cylindrical hole 29 and the second cylindrical hole 30, a separate shaft supporting member is abolished,
Since the smooth sliding of the valve element 11 and a sufficient fluid circulation passage can be secured, the supply port 21 and the output port 22 can be configured with a simple configuration.
Alternatively, the switching between the supply port 21 and the discharge hole 44 can be precisely controlled.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line II-II shown in FIG.

FIG. 3 is a sectional view taken along line III-III shown in FIG.

4 is a sectional view taken along line IV-IV shown in FIG.

FIG. 5 is a sectional view showing a solenoid valve according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solenoid valve 2 1st body 3 2nd body 5 1st seat member 6 2nd seat member 8 bobbin 9 coil 11 valve body 12 valve part 13 drive part 15 1st communicating groove 16 color 17 mover 21 supply port (1st 22) Output port (3rd port) 23 Discharge port (2nd port) 26 2nd communicating groove 29 1st cylindrical hole 30 2nd cylindrical hole 31 3rd cylindrical hole 41 Compression coil spring (elastic member)

Claims (4)

[Claims] 1. A mover that receives an electromagnetic attraction force, a mover attached to the outer periphery of the mover, a poppet type valve body made of a non-magnetic material, and one end of the valve body supported directly. A first body having the same, a second body directly pivotally supporting the other end of the valve body, and having a second port, a first seat member arranged in the first port, the second body
A second seat member disposed in the port, wherein the first body is in contact with the outer periphery of the first seat member and the valve body is seated on the second seat member And a third communication port that communicates with the third port, the second body is in contact with the outer periphery of the second seat member, and when the valve body is seated on the first seat member, the second port is provided. And a second communication groove for communicating the third port with the third port. 2. The first sheet member is fitted in a cylindrical hole of the first body, and the second sheet member is fitted in a cylindrical hole of the second body. solenoid valve. 3. A hollow cylindrical collar is provided between the first body and the second body, and by this collar, a fluid around the mover and a coil for applying an electromagnetic attraction force to the mover. The solenoid valve according to claim 2, wherein the solenoid valve is isolated. 4. A push rod that contacts the valve body, a locking member that supports the push rod, and is fixed to the second body, and disposed between the push rod and the locking member. Is
The electromagnetic valve according to claim 1, further comprising: an elastic member that biases the valve body via the push rod.