JPH0590070U - Solenoid valve device - Google Patents

Abstract

(57) [Abstract] [Purpose] A direct-acting electromagnetic on-off valve device improved so as to have a desired shock absorbing effect without making the narrow gap between the inner peripheral wall of the guide tube and the outer peripheral wall of the plunger small. I will provide a. [Structure] A stator fixed to the upper part of the electromagnetic coil,
A plunger that is slidably inserted in the guide tube with a narrow gap below the stator, and has a central hole extending in the axial direction in one of the stator 4 and the plunger 5.
15 is formed, and the spring 6 is inserted into the center hole 15 so that the valve body 7 is biased by the spring 6 against the valve seat 10.
It is characterized in that a central projection 17 which can be fitted with a minute gap 16 therein is provided on the other side of the stator 4 and the plunger 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electromagnetic opening / closing valve device used in a hydraulic circuit, particularly in a hydraulic circuit for raising and lowering an electric chair such as a treatment chair and a barber chair.

[0002]

[Prior Art]

 As a direct-acting electromagnetic on-off valve of this type, the type described in Japanese Utility Model Publication No. 62-7909 is conventionally known. As shown in FIG. 1, this known direct-acting electromagnetic on-off valve device has an electromagnetic coil 2 wound around the outer circumference of a bobbin 1, a guide tube 3 provided on the inner circumference of the bobbin 1, and an electromagnetic coil 2. Of the stator 4, which is fixedly provided in the upper half of the upper part, a plunger 5 which is slidably inserted in the guide tube 3 below the stator with a narrow gap 11, and the stator 4. A spring 6 inserted between the plunger 5 and the valve body 7 provided at the lower end of the plunger 5 and a valve provided between the inlet side fluid passage 8 and the outlet side fluid passage 9 of the fluid circuit. A seat 10, and the valve body 7 is configured to be biased against the valve seat 10 by the spring 6.

In this type of direct-acting electromagnetic on-off valve device, vibrations due to a sudden inflow and outflow of a fluid are generated along with its operation, and shocks are given to each part. The gap 11 between the surface and the inner peripheral surface of the guide tube is made small so that the fluid moves through the narrow gap 11 between the fluid passages 8 and 9 and the space 12 between the stator 4 and the plunger 5 when the valve is operated. It is disclosed in Japanese Utility Model Publication No. 62-7909 that the moving speed of the plunger can be reduced by making it.

However, the guide tube 3 provided on the inner circumference of the bobbin 1 is made of stainless steel or the like, and the screw mounting member 13 for fixing the tube 3 is screwed into the valve block 14 to be mounted. There is a limit to increasing the coaxiality between the inner circumference of the guide tube and the valve seat. In addition, foreign matter such as abrasion powder is unavoidable in the fluid used, and there is a problem that foreign matter is caught between the soft guide tube and the plunger, resulting in malfunction. From these points, the gap 11 between the guide tube and the plunger must be limited to about 0.1 to 0.2 mm, and thus it is difficult to obtain a sufficient shock absorbing effect by the narrow gap 11.

[0005]

[Problems to be solved by the device]

 In order to eliminate the above-mentioned problems, the present invention has been improved so as to obtain a desired shock absorbing effect without strictly limiting the narrow gap 11 between the inner peripheral wall of the guide tube and the outer peripheral wall of the plunger. There is an object to provide a dynamic electromagnetic on-off valve device.

[0006]

[Means for Solving the Problems]

 According to the present invention, in order to achieve the above-mentioned object, the electromagnetic coil 2 wound around the outer circumference of the bobbin 1, the guide tube 3 provided on the inner circumference of the bobbin 1, and the substantially upper half of the electromagnetic coil 2 are provided. A stator 4 fixedly provided inside the plunger, a plunger 5 slidably inserted in the guide tube 3 below the stator with a narrow gap 11, and one of the plunger 5 and the stator 4. A center hole 15 provided in the axial direction, a spring 6 inserted in the center hole, a valve body 7 provided at the lower end of the plunger, an inlet side fluid passage 8 and an outlet side fluid passage 9 of the fluid circuit. And a valve seat (10) provided between the valve seat (10) and the valve body (7) biased against the valve seat (10) by the spring (6). To obtain the central protrusion 17, the stator 4 and the plan Characterized in that projecting from the other of the turbocharger 5.

The protrusion 17 protruding from one of the stator 4 and the plunger 5 is preferably made of a non-magnetic material.

[0008]

[Action]

 According to the above-described electromagnetic on-off valve device according to the present invention, the inner diameter of the central hole 15 provided in one of the stator 4 and the plunger 5 and the outer diameter of the projection 17 provided in the other of the stator 4 and the plunger 5 are assembled with high accuracy. A small gap sufficient to obtain the desired impact mitigation effect between the inner peripheral surface of the center hole 15 and the outer peripheral surface of the protrusion 17 by finishing with a predetermined inner diameter and outer diameter by high-precision machining without being affected by It is possible to provide 16 without any problems.

Therefore, according to the present invention, when the electromagnetic on-off valve device is opened and closed, the movement of the fluid between the fluid passages 8 and 9 and the space 12 between the stator 4 and the plunger 5 is controlled by the inner circumference of the guide tube 3. Not only the narrow gap 11 between the surface and the outer peripheral surface of the plunger 5 but also the movement of the fluid between the space 12 and the inside of the central hole 15 is regulated by the minute gap 16, whereby the desired impact is achieved. A relaxing effect can be obtained.

[0010]

【Example】

 FIG. 2 shows one embodiment of the electromagnetic on-off valve device of the present invention, in which the same parts as those of the conventional device shown in FIG. Reference numeral 20 designates a bolt screwed into the stator 4 for holding the valve device integrally on the valve block 14 in an assembled state by the cover 21. 22 is a bobbin support plate.

In the embodiment shown in FIG. 2, a non-magnetic cylindrical protrusion 17 protruding from the lower end of the stator 4 at the center of the opposite end face 4 a is fixedly provided, and the center of the opposite end face 5 a at the upper end of the plunger 5 is provided. A central hole 15 is formed in the center hole 15 and extends in the axial direction. The spring 6 is inserted into the central hole 15, and the cylindrical protrusion 17 presses the spring 6 downward. A small gap 16 is slidably fitted between the inner peripheral surface 15b and the inner peripheral surface thereof, and the spring 5 pushes down the plunger 5 to urge the valve body 7 against the valve seat 10.

FIG. 3 shows another embodiment of the electromagnetic on-off valve device of the present invention. In this embodiment, a central hole 15 is provided at the lower end of the stator 4 which is open at the center of the opposed end surface 4a and extends in the axial direction, and a non-magnetic cylindrical protrusion is formed at the center of the opposed end surface 5a at the upper end of the plunger 5. 17 is fixed, the spring 6 is inserted into the center hole 15, and the cylindrical protrusion 17 is slidably inserted into the large-diameter counterbore 15b of the center hole 15 with a minute gap 16 between its inner peripheral surface. The spring 6 presses the plunger 5 downward through the cylindrical protrusion 17 to urge the valve body 7 against the valve seat 10.

[0013]

[Effect of the device]

 According to the present invention, by providing a minute gap between the inner peripheral surface of the central hole and the outer peripheral surface of the protrusion, it is possible to fix the fluid passage and the fixing member without being affected by the assembly accuracy and causing no trouble in the opening and closing operation. It is possible to provide a solenoid on-off valve device having an excellent shock absorbing function by increasing the movement resistance of the fluid to and from the child side.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a conventional direct-acting electromagnetic on-off valve device.

FIG. 2 is a vertical cross-sectional view showing an embodiment of an electromagnetic on-off valve device according to the present invention.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the electromagnetic on-off valve device according to the present invention.

[Explanation of symbols]

 1 bobbin 2 electromagnetic coil 3 guide tube 4 stator 5 plunger 6 spring 7 valve body 8 inlet side fluid passage 9 outlet side fluid passage 10 valve seat 11 gap 12 space 13 mounting member 14 valve block 15 center hole 16 small gap 17 center protrusion

Claims (1)

[Scope of utility model registration request] 1. An electromagnetic coil (2) wound around the outer circumference of a bobbin (1), a guide tube (3) provided on the inner circumference of the bobbin (1), and the upper half of the electromagnetic coil (2). A stator (4) fixedly provided inside the part, and a plunger (5) slidably inserted in the guide tube (3) below the stator with a narrow gap (11), Plunger (5) and stator
(4) A center hole (15) provided in one side of the axial direction, a spring (6) inserted in the center hole (15), a valve body (7) provided at the lower end of the plunger, and a fluid circuit. Inlet side fluid passage
Valve seat (10) provided between (8) and outlet side fluid passage (9)
The valve body (7) is fitted with a spring (6) to the valve seat (10).
In the electromagnetic on-off valve device configured to be urged against the central opening (15), a central protrusion (17) that can be inserted with a minute gap (16) is provided on the other side of the stator (4) and the plunger (5). An electromagnetic on-off valve device characterized in that it is installed on the inside.