JPS6017581Y2 - solenoid valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a solenoid valve that electromagnetically controls the flow rate of fluid.

[Prior art]

This type of continuous solenoid valve has a yoke made of a magnetic material, an electromagnetic coil, a support shaft made of a non-magnetic material, a plunger made of a magnetic material, etc. housed in a casing having an inlet and an outlet. There is a solenoid valve made of
This is proposed in Publication No. 32824.

In the solenoid valve proposed in the same publication, the plunger and the electromagnetic coil bobbin are integrally formed and assembled on the support shaft so as to be slidable in the axial direction, and the plunger is wound around the bobbin of the plunger. A pair of permanent magnets are arranged so that the magnetic flux passes at right angles to the windings of the turned electromagnetic coil.

As a result, in such a solenoid valve, the magnetic flux generated from the permanent magnet normally forms a closed loop via the support shaft and yoke, and a part of the loop leads to the electromagnetic coil, and when a current is applied to the electromagnetic coil, the current value changes. The plunger slides due to the suction force generated in response, and controls the opening area of the valve hole provided in the support shaft, thereby controlling the flow rate of fluid flowing through the valve hole.

[Problem that the invention attempts to solve]

By the way, in such a solenoid valve, the bobbin for the solenoid coil is coaxially and integrally formed with the plunger, so it becomes long in the axial direction, making it difficult to downsize the solenoid valve. Since the electromagnetic coil slides integrally with the plunger, the magnetic properties of the electromagnetic coil change, making the plunger's control of opening and closing the valve hole insufficiently reliable, and also affecting the durability of the electromagnetic coil.

In addition, since such solenoid valves require the use of permanent magnets, the opening/closing control of the valve hole is likely to change depending on the temperature due to the influence of the temperature characteristics of the permanent magnets, and the use of permanent magnets also reduces costs. It is disadvantageous.

[Means for solving problems]

In order to solve these problems, the present invention incorporates a solenoid valve of this type within a casing having an inlet and an outlet, a cylindrical yoke made of a magnetic material fixed to the casing, and a cylindrical yoke wound around the outer circumference of the yoke. a support shaft made of a non-magnetic material and fixed to the casing concentrically with respect to the yoke, the support shaft having a valve hole for communicating the inflow port and the outflow port; It is movably assembled and forms a magnetic circuit together with the yoke through a predetermined gap between it and the inner circumferential surface of the yoke, and is slid by an attractive force generated in accordance with the current value applied to the electromagnetic coil. The valve hole is configured to house a cylindrical plunger made of a magnetic material that opens and closes the valve hole, and a spring member that urges the plunger in one direction in the axial direction against the attraction force.

[Functions and effects of the idea]

As a result, in the present invention, since the electromagnetic coil is fixed and fixed concentrically to the outer circumference of the plunger within the casing, the axial length of the electromagnetic valve is shortened and the size is reduced. Since only the plunger slides to control the opening and closing of the valve hole, its reliability is high, and the electromagnetic coil has high durability.Furthermore, since no permanent magnet is used in this invention, the opening and closing control of the valve hole is controlled by temperature. It is not affected by changes and is advantageous in terms of cost.

〔Example〕

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

As shown in the figure, the electromagnetic valve according to the present invention includes a casing 10 composed of a cylindrical body 11 made of a magnetic material and a cover 12 made of a non-magnetic material. The gasket 11a is used to tighten the screws 11a and 11b.

The cover 12 is also provided with an inlet 12a connected to a fluid supply source and an outlet 12b connected to a controlled device such as a gas actuator.

The casing 10 houses a cylindrical yoke 13 and an electromagnetic coil 16 wound around the outer periphery of the yoke 13 via a frame 14 and a bobbin 15 made of a non-magnetic material.

As shown in the figure, the yoke 13 is integrally formed with a ring body 13a made of a magnetic material, a ring body 13b made of a non-magnetic material, and a cylindrical shape 13c made of a magnetic material.
3a and the cylindrical body 13c are the cylindrical body 11 that constitutes the casing 10.
It constitutes a magnetic circuit together with a plunger 18, which will be described later.

Note that the reference numeral 14a indicates a collar for assembling and fixing the frame 14 to the outer periphery of the yoke 13.

In this embodiment, the support shaft 17 made of a non-magnetic material is inserted into the hollow part of the yoke 13 with its both ends fitted into the boss 12c of the cover 12 and the stepped part 13d of the yoke 13. A cylindrical plunger 18 is fixed concentrically and mounted on the support shaft 17 so as to be slidable in the axial direction.

The support shaft 17 has a shaft hole 17a communicating with the outlet 12b at one end thereof.A plurality of valve holes 1 are formed in the peripheral wall of the shaft hole 17a, which are opened and closed by a plunger 18 functioning as a valve body.
7b is provided.

Thereby, the inlet 12a and the outlet 12b communicate with each other through the shaft hole 17a and the valve hole 17b in response to the movement of the plunger 18.

The plunger 18 is biased to the left in the figure by a compression coil spring 19 whose one end is locked to the stepped portion 13d of the yoke 13 via the retainer 20 in the hollow portion of the yoke 13, and closes the valve hole 17b. Engaged to the inner end.

Further, the plunger 18 has large diameter portions 18a and 18c having the same diameter located at both ends thereof, and a small diameter portion 18b located between these large diameter portions.

Each outer peripheral surface of 18c forms a predetermined gap g with the inner peripheral surface of the large diameter hollow part of the yoke 13, and the large diameter part 18a
, 18c are approximately equal to the axial length of the inner circumferential surface of the annular body 13a of the yoke 13 and the axial length of the inner circumferential surface of the large-diameter hollow portion of the cylindrical member 13c.

In addition, in the figure, the reference numeral 21 indicates a screw for adjusting the elasticity of the coil spring 19, and the reference numeral 22 indicates a sealing member.

In the embodiment configured in this manner, when the electromagnetic coil 16 is in a non-excited state, the plunger 18 is in the original position (the position indicated by the solid line in the figure) and closes the valve hole 17b.

In this state, the current from the DC power source is applied to the electromagnetic coil 1.
6, the magnetic flux generated by the current flowing through the electromagnetic coil 16 is applied to the cylindrical body 11.6. Ring body 13a1 plunger 18
Large diameter part 18a1 Small diameter part 18b, Large diameter part 18c1 Cylindrical body 1
Pass through 3c.

As a result, an attractive force corresponding to the value of the current is generated between the inner circumferential surfaces of the ring body 13a and the cylinder body 13c and the outer circumferential surfaces of the large diameter portions 18a and 18c of the plunger 18. The plunger 18 is connected to the coil spring 1 in proportion to
9 and opens the valve hole 17b.

As a result, fluid from the fluid supply source is applied to the controlled device through the inlet 12a1, the valve hole 17b, and the outlet 12b.

When the value of the current applied to the electromagnetic coil 16 is further increased, the attraction force that acts between the yoke 13 and the plunger 18 through the gap g further increases, and the plunger 18 is moved closer to the coil in proportion to this increase in attraction force. When it further moves against the spring 19 and reaches the maximum stroke position (the position indicated by the two-dot chain line in the figure), the valve hole 17b becomes fully open.

Thereby, the amount of fluid applied from the fluid supply source to the controlled device through the valve hole 17b is maximized.

Incidentally, in this embodiment, the plunger 18 is formed into a cylindrical shape, and is assembled so as to be slidable in the axial direction on a support shaft 17 made of a non-magnetic material that is fixed concentrically to the yoke 13. , a shaft hole 17a provided in the support shaft 17
and the inlet 12a and the outlet 12 through the valve hole 17b (connected to the shaft hole 17a and opened and closed by the plunger 18).
b is communicated with each other, the axial length of the solenoid valve can be shortened, and the plunger 18 can be moved appropriately (without contacting the yoke 13 along the axis of the yoke 13). (can be moved smoothly).

Therefore, the solenoid valve can be constructed compactly, and the solenoid valve can operate favorably.

In addition, in this embodiment, the opening and closing of the valve hole 17b is performed only by sliding of the plunger 18, and the electromagnetic coil 16 does not slide. Moreover, since no permanent magnet is used, the opening/closing control of the valve hole 17b is not affected by temperature changes, and is also advantageous in terms of cost.

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of the present invention. Explanation of symbols, 10...Casing, 12a...
...Inlet, 12b...Outlet, 13...
... Yoke, 16 ... Electromagnetic coil, 17.
...Support shaft, 17a...Shaft hole, 17b.
... Valve hole, 18 ... Plunger 19 ...
...Coil spring, g...Gap.

Claims (1)

[Scope of utility model registration request] A cylindrical yoke made of a magnetic material fixed to the casing, an electromagnetic coil wound around the outer periphery of this yoke, and a valve hole that communicates the inflow and outflow ports are provided in a casing having an inflow port and an outflow port. a support shaft made of a non-magnetic material fixed to the casing concentrically with respect to the yoke; a cylindrical plunger made of a magnetic material that forms a magnetic circuit together with the yoke through a gap and slides to open and close the valve hole by an attractive force generated according to a current value applied to the electromagnetic coil; A solenoid valve that houses a spring member that urges the plunger in one direction in the axial direction against the attraction force.