JPH0583558U - solenoid valve - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the performance by improving the malfunction by sticking the plunger and valve seat. [Structure] When the center post 5 is energized to the coil 6, it is movable to the plunger 2 side against the biasing force of the biasing means 7.
It is characterized in that a stopper portion 13 for stopping the moved center post 5 is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a solenoid valve used for controlling various fluid pressure devices, for example.

[0002]

[Prior Art]

 A conventional solenoid valve of this type is shown in FIG. That is, this solenoid valve is configured to reciprocate the plunger 100 to bring it into and out of contact with the valve seat 101 to open and close the flow passage 102 that opens to the valve seat 101.

This electromagnetic valve includes a center post 103 made of a magnetic material, a coil 104 provided so as to surround the outer circumference of the center post 103, a valve seat 101 provided to face the center post 103, and a center post 103. A plunger 100 that is reciprocally inserted between the plunger 100 and the valve seat 101, and the plunger 100 is seated by the biasing means 105 interposed between the plunger 100 and the center post 103. 1, the valve 100 is kept in a normally closed state, and by energizing the coil 104, the plunger 100 is magnetically attracted to the center post 103 and separated from the valve seat 101 against the biasing force of the biasing means 105. It is configured to open the valve.

[0004]

[Problems to be solved by the device]

 However, in the case of the above-mentioned conventional technique, when the fluid passing through the flow path 102 is a fluid containing oil mist (gas, air, etc.), the fluid interposed between the plunger 100 and the valve seat 101 is a heat cycle or the like. Under such environment, there is a problem that it becomes coal tar-like and its adhesive force causes the plunger 100 and the valve seat 101 to adhere to each other, resulting in malfunction.

As a means for solving this problem, it is conceivable to generate a suction force superior to the fixing force. In order to increase the suction force, conventionally, a means for increasing the size of the coil 104 or shortening the stroke (air gap length) of the plunger 100 is taken.

However, in this case, there is a problem that the fluid flow rate is reduced due to an increase in size and a decrease in stroke.

The present invention has been made in order to solve the above-mentioned problems of the prior art, and an object of the present invention is to provide a solenoid valve capable of improving performance by improving malfunction due to sticking of a plunger and a valve seat. To provide.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, in the present invention, a center post made of a magnetic material, a coil provided so as to surround the outer periphery of the center post, a valve seat provided so as to face the center post, and a center A plunger that is reciprocally inserted between the post and the valve seat, and reciprocally moves the plunger to open and close the flow path that opens and closes the valve seat. The plunger is brought into contact with the valve seat by the biasing means interposed between the plunger and the center post to keep the valve closed at all times, and the coil is energized to resist the biasing force of the biasing means. A solenoid valve that magnetically attracts the plunger to the center post and separates it from the valve seat to open it, and when the center post is energized to the coil, it can move to the plunger side against the biasing force of the biasing means. , Transfer Characterized in that a stopper portion for stopping the center post.

[0009]

[Action]

 In the solenoid valve configured as described above, even if the fluid interposed between the plunger and the valve seat becomes a coal tar and the plunger sticks to the valve seat, the center post can move to the plunger side when the coil is energized. Therefore, when the center post moves to the plunger side and stops at the stopper, the air gap length between the plunger and center post becomes smaller and the suction force applied to the plunger rises. Moves away from the valve seat and the plunger can move.

[0010]

【Example】

 The present invention will be described below based on the illustrated embodiment. 1 and 2 showing an electromagnetic valve according to an embodiment of the present invention, reference numeral 1 denotes the entire solenoid valve, and this solenoid valve 1 is a valve seat which is a valve seat when a plunger 2 is reciprocated. 3, which opens and closes the flow path 4 which opens and closes the valve seat 3 when brought into contact with and separated from the valve seat 3.

The solenoid valve 1 is generally configured by a center post 5 made of a magnetic material, a coil 6 provided so as to surround the outer periphery of the center post 5, a valve seat 3 provided so as to face the center post 5, and a center. It is composed of a plunger 2 which is reciprocally inserted between the post 5 and the valve seat 3, and a spring 7 as an urging means interposed between the plunger 2 and the center post 5.

The coil 6 has a cylindrical shape and is housed in the inner circumference of a cylindrical case 8, and a sleeve 9 is fitted and fixed to the inner circumference of the coil 6. The center post 5 is inserted through the sleeve 9 into the inner circumference of one opening of the coil 6, and the valve seat 3 is provided so as to face the center post 5. The valve seat 3 is provided on a base 10 that is integrally assembled with the case 8, and the valve seat 3 is provided with a flow path 4 opening to the valve seat 3. Further, the base 10 is provided with an output side flow passage 11 in a direction orthogonal to the flow passage 4 of the valve seat 3.

The plunger 2 has a cylindrical shape with a bottom and an opening on the side of the center post 5 and is reciprocally movable between the center post 5 and the valve seat 3 via a sleeve 9 on the inner circumference of the other opening of the coil 6. Has been inserted. A spring 7 is interposed between the plunger 2 and the center post 5, one end of which abuts on the closing surface 21 of the plunger 2 and the other end of which abuts on the end surface of the center post 5 to move the plunger 2 into the valve seat 3 It is biased to the side. Further, a concave seat member 12 that is in contact with the valve seat surface 31 of the valve seat 3 is attached to the end surface of the plunger 2 on the valve seat 3 side.

On the other hand, the center post 5 has an inverted T-shaped cross section and is composed of a cylindrical portion 51 and a disc portion 52. The outer periphery of the disc portion 52 is inserted into the inner periphery of one opening of the coil 6 via the sleeve 9. It is being touched. The diameter of the disc portion 52 is slightly larger than the outer diameter of the plunger 2. Therefore, in the sleeve 9, a step 13 is formed as a stopper portion for stopping the center post 5 due to the relationship between the diameter of the plunger 2 and the diameter of the disc portion 52 of the center post 5. The step 13 is formed at a position slightly closer to the center post 5 side than the end surface of the plunger 2 on the center post 5 side when the coil 6 is not energized.

The columnar portion 51 of the center post 5 is a cylinder of the cylindrical plate 14 having an outward flange portion 14 A that is inserted and fixed to the opening end portion of the inner circumference of one opening portion of the coil 6 via the sleeve 9. It is slidably inserted into the inner periphery of the hole 14C of the portion 14B and is movable to the plunger 2 side. Therefore, the spring 7 has two movable parts, the plunger 2 and the center post 5, on both ends thereof. In the plate 14, the inner end surface of the outward flange portion 14A is in contact with the upper end surface of the coil 6, and the outer end surface of the outward flange portion 14A is caulked and fixed by the opening end portion 81 of the case 8. The plate 14 is a yoke member that guides the magnetic path to the center post 5.

Further, when the coil 6 is not energized, the center post 5 is urged toward the plate 14 by the urging force of the spring 7 interposed between the center post 5 and the plunger 2, and the center post 5 is The end face of the disc portion 52 on the plate 14 side and the end face of the cylindrical portion 14B of the plate 14 on the center post 5 side are in contact with each other, and the center post 5 and the plate 14 are integrated.

When the coil 6 is not energized, the plunger 2 is separated from the center post 5 by the biasing force of the spring 7 with the air gap length (stroke) A1 shown in FIG. Then, the flow path 4 which is in contact with the valve seat 3 and opens to the valve seat 3 is closed to keep the valve closed at all times.

Next, when the coil 6 is energized, the center post 5 is excited via the plate 14 as shown in FIG. 2A, and the plunger 2 resists the urging force of the spring 7 on the center post 5. It is magnetically attracted and moves to the center post 5 side by the air gap length A1 (stroke), and the plunger 2 separates from the valve seat 3 to open the flow path 4 opening to the valve seat 3 and the fluid pressure to the output side flow. Output to path 11.

In the solenoid valve having the above structure, when the fluid passing through the flow path 4 is a fluid containing oil mist or the like, the fluid interposed between the plunger 2 and the valve seat 3 is a cold heat cycle or the like. When the plunger 2 and the valve seat 3 are fixed due to the adhesive force under the environment of, the coil 6 is energized when the plunger 2 and the valve seat 3 are fixed. Since it is slidable on the inner circumference of the hole 14C of the portion 14B, the center post 5 moves toward the plunger 2 side against the biasing force of the spring 7 by the suction force as shown in FIG. 1 (b). The air gap length A2 (stroke) is reduced by stopping at the step 13 of the sleeve 9. As a result, the suction force applied to the plunger 2 rises, and the plunger 2 moves away from the valve seat 3 due to the fixing force, and the plunger 2 becomes movable. In this way, malfunctions due to the sticking of the plunger 2 and the valve seat 3 can be improved, and the performance can be improved.

In addition, since the air gap length A2 between the plunger 2 and the valve seat 3 is shortened, that is, the stroke is reduced only when the plunger 2 is fixed to the valve seat 3, the stroke can be reduced as in the prior art. There is no problem that the fluid flow rate decreases due to the decrease.

Further, when the plunger 2 adheres to the valve seat 3, the center post 5 moves to the plunger 2 side to shorten the air gap length of the plunger 2 to the air gap length A2, and thereby the suction force superior to the adhesion force. Therefore, it is possible to reduce the size of the coil 6 as compared with the conventional technique without increasing the size of the coil 6 as in the conventional technique.

Although the center post 5 has an inverted T-shaped cross section in the above-described embodiment, the shape of the center post 5 can be implemented in various modes other than this without departing from the scope of the present invention.

Further, although the description has been given by taking the case where the step 13 is formed on the sleeve 9 as the stopper portion as an example, it is not particularly limited to this, and may be directly provided on the inner circumference of the coil 6. The shape of the stopper is not limited to the step 13, but may be any shape according to the shape of the center post.

[0024]

[Effect of the device]

 The present invention has the above-described configuration and operation, and when the fluid interposed between the plunger and the valve seat becomes coal tar-like and the plunger sticks to the valve seat, when the coil is energized, the center post energizes the means. Since it can move to the plunger side against the urging force of the plunger, the center post moves to the plunger side and stops at the stopper part, which reduces the air gap length between the plunger and the center post and reduces the plunger. The suction force increases, the sticking force is reached, the plunger is separated from the valve seat, and the plunger becomes movable. In this way, malfunctions due to the sticking of the plunger and the valve seat can be improved, and performance can be improved.

Further, in order to generate a suction force superior to the fixing force, it is not necessary to enlarge the coil as in the conventional technique, and the size can be reduced as compared with the conventional technique.

[Brief description of drawings]

FIG. 1 (a) is an overall vertical cross-sectional view of a solenoid valve according to an embodiment of the present invention, and FIG. 1 (b) is a vertical cross-sectional view of an essential part of a state where a center post is moved to a plunger side. is there.

2 (a) is a longitudinal sectional view of a main part of FIG. 1 (a) when the coil is energized, and FIG. 2 (b) is a main part of the state of FIG. 1 (b) when the coil is energized. FIG.

FIG. 3 is an overall vertical sectional view of a conventional solenoid valve.

[Explanation of symbols]

 1 Solenoid Valve 2 Plunger 21 Closing Surface 3 Valve Seat (Valve Seat) 31 Valve Seat Surface 4 Flow Path 5 Center Post 51 Cylindrical Part 52 Disc Part 6 Coil 7 Spring (Biasing Means) 8 Case 81 Open End 9 Sleeve 10 Base 11 Output side flow path 12 Sheet member 13 Step (stopper part) 14 Plate 14A Outward flange part 14B Cylindrical part 14C Hole

Claims (1)

[Scope of utility model registration request] 1. A center post made of a magnetic material, a coil provided so as to surround the outer circumference of the center post, a valve seat provided so as to face the center post, and a reciprocating motion between the center post and the valve seat. A plunger that is freely inserted, and reciprocally moves the plunger to open and close the flow path that opens and closes the valve seat, and is interposed between the plunger and the center post. The plunger is brought into contact with the valve seat by the biasing means to keep the valve in a normally closed state, and the coil is energized to resist the biasing force of the biasing means to magnetically attract the plunger to the center post to seat the valve seat. In a solenoid valve which is separated from the valve and opened, when the center post is energized to a coil, it is movable against the urging force of urging means to the plunger side, and is a stopper for stopping the moved center post. A solenoid valve characterized by having a section.