JP2968226B2 - solenoid valve - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve, and more particularly to a solenoid valve having a permanent magnet provided on a valve body.

[0002]

2. Description of the Related Art Conventionally, as a solenoid valve, an actual valve has been disclosed in Japanese Utility Model Application No. 60-75.
No. 780 is known. First, the configuration of the solenoid valve 100 will be described with reference to FIG. 10
Reference numeral 2 denotes a valve box having an inlet pipe 106 connected to one side (right side in the figure) of the valve hole 104 and an outlet pipe 108 connected to the other side (lower part in the figure).
A ring 110 made of, for example, an N-pole permanent magnet is provided in the valve seat.
Is fixedly provided. Reference numeral 112 denotes a cylindrical core body of an electromagnet extending on the valve box 102. A plunger 114 is provided inside the core body 112, while a coil 116 is provided on the outside, and a suction seat 118 is provided on the upper part. Is provided. In addition,
The plunger 114 is constituted by a permanent magnet having an N pole at an upper part and an S pole at a lower part, and a valve body 120 formed of a sphere is fixed to the lower part.

Next, the operation will be described. In the valve closed state shown in FIG.
8, an N pole portion of the plunger 114 is moved upward by the suction seat 118, and the plunger 114 moves upward.
0 moves away from the ring 110 and the valve is opened. Once the valve is in the open state, the plunger 114 is attracted to the suction seat 118 so that the valve is maintained in the open state even when the power supply to the coil 116 is cut off. Therefore, no electric power is required to keep the valve open. When the valve is closed, the coil 116 is energized in the opposite direction to generate an N-pole at the suction seat 118, and the plunger 114 is moved downward by the repulsive force of the N-poles. The valve hole 104 is closed. After the valve is once closed, the S-pole portion of the plunger 114 is attracted to the ring 110 composed of the N-pole permanent magnet, and the valve-closed state is maintained even if the energization of the coil 116 is stopped.
Therefore, no electric power is required for maintaining the valve closed state.

[0004]

However, in the above-described solenoid valve, in order to shift from the valve closed state to the valve open state, an S pole is generated in the suction seat to suction the N pole of the valve body.
The valve body must be moved upward, but there is always a force that pulls the valve body downward between the S-pole at the bottom of the valve body and the ring constituted by the N-pole permanent magnet. For this reason, it is necessary to increase the strength of the magnetic pole generated in the attraction seat, and it is necessary to increase the current flowing through the coil, increase the number of turns of the coil, increase power consumption, and increase the electromagnet. There is a problem that it is difficult to reduce the size of the solenoid valve because it becomes large. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to solve the above-described problems, and an object of the present invention is to provide an electromagnetic valve which consumes less power and can be reduced in size.

[0005]

The present invention has the following arrangement to achieve the above object. That is, the invention according to claim 1 of the present invention provides a valve body having a valve chamber therein, a first wall portion of the valve chamber, and a second wall portion facing the first wall portion in the valve chamber. And a valve body movably arranged between the first wall part and the second wall part of the valve body. And one of the magnetic poles is provided on the valve body, one of the magnetic poles constitutes the first wall portion, and the other magnetic pole is always located on the side surface of the valve chamber within the moving range of the permanent magnet. Arranged in such a manner, an opening in one of the first wall portion or the second wall portion, a first flow passage opened and closed by the valve body, and an opening in the valve chamber. And a second flow path that is always in communication with the valve chamber.

According to this configuration, the permanent magnet is not disposed on the first wall portion or the second wall portion of the valve chamber which comes into contact with the valve body on which the permanent magnet is disposed, unlike the conventional example. Further, the permanent magnet provided on the valve body receives a force in the same direction as that received from the first wall from the other magnetic pole together with the first wall, which is one magnetic pole of the electromagnet. Even if the intensity of the generated magnetic field is smaller than that of the conventional example, the valve body can be moved, and the power consumption can be reduced. Accordingly, the power consumption can be reduced, the size of the electromagnet can be reduced, and the size of the solenoid valve itself can be reduced.

[0007] A third flow path is provided in the other wall of the first wall or the second wall, the third flow path being alternately opened and closed by the valve body with the first flow path. Thereby, a three-way valve with low power consumption can be realized.

Specifically, when the second wall is made of a non-magnetic material, when the electromagnet is not energized, the valve body is attracted to the first wall constituting one of the magnetic poles of the electromagnet. 1
The closed state of the flow path or the third flow path can be maintained.

Further, when the second wall is made of a magnetic material, the valve is moved even if the electromagnet is de-energized after the valve moves to the first wall or the second wall. Since each magnetic wall is attracted by its own magnetic force, the first channel or the third channel can be kept closed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a solenoid valve according to the present invention will be described below with reference to the accompanying drawings. (First Embodiment) First, a two-way valve type solenoid valve 10 will be described with reference to FIG. A valve chamber 14 is formed inside the valve body 12. Although the space shape of the valve chamber 14 is formed in a cylindrical shape as an example, it may be formed in a square tube shape. The valve body 12 is made of a non-magnetic material such as a synthetic resin material.

The valve body 16 is provided in the valve chamber 14 with walls at both ends in the longitudinal direction (the left-right direction in FIG. 1) of the valve chamber 14, that is, the first wall.
And a second wall 20 opposed to the first wall 18 so as to be movable. In the present embodiment, the valve body 16 is formed in a cylindrical shape in conformity with the spatial shape of the valve chamber 14, and the outer diameter thereof is formed slightly smaller than the inner diameter of the valve chamber 14, and is slidable in the valve chamber 14 in the left-right direction. It is. The valve body 16 is formed to have a smaller diameter than the inner diameter of the valve chamber 14 as described above, and in some cases, the outer wall has an end portion on the first wall portion 18 side and an end portion on the second wall portion 20 side. A communication groove (not shown) for communicating with the valve body 16 is formed. Further, the valve body 16 is provided with a permanent magnet 22 such that different magnetic poles are located at the end on the first wall 18 side and the end on the second wall 20 side. In the present embodiment, the valve body 16 is formed in a ring shape in conformity with the shape of the valve body 16, near the outer periphery of the valve body 16, the end on the first wall 18 side is an N pole, and the end on the second wall 20 side. The portion is arranged so as to be an S pole. Further, an elastic material (rubber material or flexible synthetic resin material) 24 is incorporated in the center of the valve body 16 so that the opening portions of a first wall portion 18 and a second wall portion 20 described later can be sealed. Has become. The valve element 16 is a cup-shaped member 16a having a through hole in the center of the bottom surface, in which a permanent magnet 22 in which an elastic material 24 is fitted at the center is incorporated, and a disc 16b having a through hole in the center. Cup-shaped member 1
6a is covered with a lid . And cup-shaped member 1
The elastic material 24 is exposed in the through holes of the disk 6a and the disk 16b in a substantially flush state. Cup-shaped member 16a and disc 16b
Is formed of a non-magnetic material.

An electromagnet 26 is provided on the valve body 12, one of the magnetic poles 28 forms the first wall portion 18, and the other magnetic pole 3
0 is arranged on the side surface of the valve chamber 14 so as to be always located within the moving range of the permanent magnet 22. Specifically, as an example, the coil 32 of the electromagnet 26 is located on the right side (first
Of the yoke 34 made of a magnetic material (iron, ferrite, etc.)
The right end side of the yoke 34 extends to the side of the valve chamber 14 bypassing the outer edge of the coil 32, and is further bent toward the center of the valve chamber 14. Is formed. The right end of the yoke 34 is disposed as the other magnetic pole 30 so as to be exposed on the side surface of the valve chamber 14. The first flow passage 36 opens in one of the first wall portion 18 and the second wall portion 20 and is opened and closed by the valve body 16. In addition, the second flow path 38 opens to the valve chamber 14 and always communicates with the inside of the valve chamber 14 regardless of the position of the valve body 16.

Next, the operation of the solenoid valve 10 will be described with reference to FIGS. The material of the second wall portion 20 is a non-magnetic material, and is formed integrally with or separately from the valve body 12. In addition, the first flow path 36 is assumed to open to the first wall 18. Also, the second flow path 38
Fluid (gas or liquid) is supplied to the inside of the valve chamber 14. When the electromagnet 26 is not energized, the first
Since the wall 18 of the valve body 16 is made of a magnetic material, the valve body 16 in which the permanent magnet 22 is incorporated is attracted to the first wall 18 and thus the elastic member 24 disposed at the central portion of the valve body 16
Is a state in which the opening of the first flow path 36 is closed. Therefore, the fluid from the second channel 38 does not flow into the first channel 36.

Subsequently, the electromagnet 26 is energized to excite one magnetic pole 28 to the N pole. Thereby, between the one magnetic pole (N pole) 28 of the electromagnet 26 and the N pole on the first wall portion 18 side of the permanent magnet 22 incorporated in the valve body 16, as shown in FIG. Is moved in the direction of the second wall 20. Further, in the case of the solenoid valve 10 of the present invention, the other magnetic pole (S-pole) 30 of the electromagnet 26 is
2 so as to be always located within the movement range of the permanent magnet 22, that is, the left end (S
The right end (N pole) of the permanent magnet 22 is always the first pole of the electromagnet 26 from the other magnetic pole 30 in the range A on the second wall 20 side of the other pole 30 of the electromagnet 26. Since it is located within the range B on the wall portion 18 side, the gap between the other magnetic pole (excited to the S pole) 30 and the S pole of the permanent magnet 22 and the other magnetic pole 30 and the N pole of the permanent magnet 22 The same repulsive force F2 and suction force F3 in the direction of the second wall 20 act on each of the spaces. Therefore, even if the excitation of the electromagnet 26 is weak, that is, even if the excitation current flowing through the coil 32 is small, the valve body 16 is sufficiently moved in the direction of the second wall portion 20 so that the second
And the second flow path 38 and the first flow path 36 communicate with each other via the valve chamber 14 so that the fluid from the second flow path 38 flows into the first flow path 36. It becomes possible.

When the current to the electromagnet 26 is stopped again, the magnetic flux from the N pole of the permanent magnet 22 of the valve body 16 enters one magnetic pole 28 of the yoke 34 of the electromagnet 26, passes through the other magnetic pole 30, and Since a magnetic circuit for returning to the S-pole of the permanent magnet 22 is formed between the permanent magnet 22 and the yoke 34, the valve element 16 has one magnetic pole 28, that is, the first wall 18
The first flow path 36
Close. Thus, the fluid from the second flow path 38 does not flow into the first flow path 36. In addition, the valve element 1
Since the fluid pressure of the fluid flowing into the valve chamber 14 from the second flow path 38 is applied to the second wall portion 20 side of the first flow path 6, the first flow path 3
6 can be closed.

In the above embodiment, the first flow path 3
6 was opened to the first wall portion 18, but the first
1 is opened in the second wall portion 20 as shown by a dotted line in FIG. 1, and the second flow passage 38 and the first flow passage 36 are always in communication with the electromagnet 26 in a non-energized state. , Electromagnet 26
The second flow path 38 and the first flow path 36 may be in a non-communication state only when power is supplied to the power supply.

Although the second wall 20 is made of a non-magnetic material, it may be made of a magnetic material instead. The operation of this configuration will be described. It is assumed that the valve body 16 is initially in a state of being adsorbed to the first wall portion 18 as shown in FIG. In this state, when a current is supplied to the electromagnet 26 to excite the one magnetic pole 28 of the yoke 34 to the N pole and the other magnetic pole 30 to the S pole, the valve element 16 In response to the repulsive force (F1, F2) and the attraction force (F3) in the direction of the second wall portion 20 from the direction 30, it moves in the direction of the second wall portion 20 (left direction in FIGS. 1 and 3), 2 abuts against the wall 20. Once in this state, even if the current of the electromagnet 26 is stopped, this state is maintained because the permanent magnet 22 of the valve body 16 is attracted to the second wall 20 made of a magnetic material.

Next, in order to move the valve body 16 to the first wall portion 18 again, a current in the opposite direction is supplied to the electromagnet 26, and the one magnetic pole 28 of the yoke 34 is turned to the S pole, and the other magnetic pole 30 is turned to the other pole. N
Energize the poles. As a result, the directions of F1, F2, and F3 received by the valve body 16 from the poles 28 and 30 of the yoke 34 are reversed as shown in FIG. 4, and the valve body 16 is moved to the first wall portion 18 (one magnetic pole 28). ) Direction, the first wall 18
Abut. Once in this state, even if the current of the electromagnet 26 is stopped, this state is maintained because the permanent magnet 22 of the valve body 16 is attracted to the first wall 18 made of a magnetic material. As described above, by forming the second wall body 20 from the magnetic material similarly to the first wall portion 18, a solenoid valve having a latch function can be realized.

(Second Embodiment) First, the structure will be described. The difference between the solenoid valve 40 of the present embodiment and the first embodiment is as shown in FIGS. Is that the first flow path 36 is opened in the first wall portion 18 and the third flow path 42 is also opened in the second wall portion 20. Functions as a three-way valve type solenoid valve. The other configuration is the same as that of the first embodiment, and the same reference numerals are given and the description is omitted.

Next, the operation will be described. The second
Is formed of a non-magnetic material.
First, it is assumed that the valve body 16 is attracted to one magnetic pole 28 of the yoke 34 of the electromagnet 26, that is, the first wall portion 18 when the electromagnet 26 is not energized. In this case, the second flow path 38 and the third flow path 42 communicate with each other via the valve chamber 14. In this state, when a current is supplied to the electromagnet 26 to excite the one magnetic pole 28 of the yoke 34 to the N-pole and the other magnetic pole 30 to the S-pole, the valve element 16 becomes in the same manner as described in the first embodiment. As shown in FIG. 3, the yoke 34 receives the repulsive force (F1, F2) and the attractive force (F3) from the poles 28, 30 of the yoke 34 in the direction of the second wall 20, and moves in the direction of the second wall 20. Second
Abuts on the wall portion 20. As a result, the third channel 42 is closed only while the electromagnet 26 is in the energized state, and the second channel 38 communicates with the first channel 36 instead.

When the current to the electromagnet 26 is stopped, the permanent magnet 22 of the valve body 16 is
Is attracted to one magnetic pole 28 (first wall portion 18) of the yoke 34, and is attracted to the first wall portion 18, and the first flow path 36 is closed again. It communicates with the channel 42. As described above, by de-energizing and energizing the electromagnet 26,
A state in which each of the second flow paths 38 communicates with the third flow path 42;
The first flow path 36 is in communication with the first flow path 36.
Is the inflow port, the second flow path 38 is the outflow port, and the third flow path 4
By making 2 a discharge port, it functions as a three-way valve.

As in the first embodiment, the second wall portion 20 is made of a magnetic material instead of a non-magnetic material, so that the valve body 16 comes into contact with the second wall portion 20. Even if the current to the electromagnet 26 is stopped, the permanent magnet 22
Is held by the second wall portion 20, this state is maintained, and it is possible to operate as a three-way valve with a latch function.

Although the preferred embodiments of the present invention have been described in various ways, the present invention is not limited to the above-described embodiments, and the direction of the magnetic pole of the permanent magnet 22 provided on the valve body 16 is reversed. The S pole side may be arranged in the direction of the first wall 18. The electromagnet 26 is arranged in the valve body 12 such that one magnetic pole of the yoke 34 is
6 may be located at any position as long as it is located on one wall portion along the moving direction of the valve 6 and the other magnetic pole is located on the side of the moving direction of the valve body 16, for example, contrary to the above embodiment. Of course, many modifications can be made without departing from the spirit of the invention, such as being disposed on the second wall 20 side in the valve body 12 or on the side of the valve chamber 14. is there.

[0024]

According to the first aspect of the present invention, when the solenoid valve according to the present invention is used, the first wall and the second wall of the valve chamber which abuts on the valve body on which the permanent magnet is disposed are provided. Since the permanent magnet is not provided as in the example, the permanent magnet provided on the valve body is further provided with the first wall, which is one magnetic pole of the electromagnet, and the other magnetic pole from the first wall. Since the force is received in the same direction as the direction in which the valve is received, the valve body can be moved even if the strength of the magnetic field generated by the electromagnet is smaller than in the conventional example, and power consumption can be reduced. Therefore, there is an effect that the power consumption can be reduced and the electromagnet can be downsized, so that a small electromagnetic valve can be realized. Further, by providing a third flow path which is opened in the other wall of the first wall or the second wall and is alternately opened and closed by the valve body with the first flow path, power consumption is reduced. A three-way valve type solenoid valve can also be realized. Further, when the second wall portion is formed by using a magnetic material, the valve body is formed of the first wall.
Even when the electromagnet is de-energized after moving to the wall portion side or the second wall portion side, the first flow passage or the third flow passage is closed because the valve body is attracted to each wall by its own magnetic force. There is an effect that a latch-type solenoid valve capable of holding a state can be realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a two-way valve as a first embodiment of an electromagnetic valve according to the present invention, showing a state where a valve body closes a first flow path.

FIG. 2 is a cross-sectional view showing a state in which the valve body of FIG. 1 moves toward a second wall, and a first flow path and a second flow path communicate with each other.

FIG. 3 is an explanatory diagram showing a state of a repulsive force and an attractive force acting from both magnetic poles of an electromagnet on a permanent magnet disposed on a valve body, in a state where a force in a direction away from one magnetic pole acts on the permanent magnet; Is shown.

FIG. 4 is an explanatory view showing a state of a repulsive force and an attractive force acting from both magnetic poles of an electromagnet on a permanent magnet disposed on a valve body, and a force in a direction attracted to one magnetic pole acts on the permanent magnet; Indicates the status.

FIG. 5 is a cross-sectional view showing a three-way valve as a second embodiment of the solenoid valve according to the present invention, in which a valve element is attracted to one magnetic pole by a permanent magnet, and a third flow path is a second flow path. This shows a state of communication with the road.

FIG. 6 is a cross-sectional view showing a state in which the valve body of FIG. 5 moves toward the second wall, and the first flow path and the second flow path communicate with each other.

FIG. 7 is a front sectional view showing an example of a conventional solenoid valve.

[Explanation of symbols]

 Reference Signs List 10 solenoid valve 12 valve body 14 valve chamber 16 valve body 18 first wall 20 second wall 22 permanent magnet 26 electromagnet 28 one magnetic pole 30 the other magnetic pole 36 first flow path 38 second flow path

Claims (4)

(57) [Claims] A valve body having a valve chamber therein; and a movable inside the valve chamber between a first wall portion of the valve chamber and a second wall portion facing the first wall portion. A permanent magnet provided such that different magnetic poles are located at the first wall-side end and the second wall-side end of the valve; An electromagnet provided on the valve body, wherein one magnetic pole constitutes the first wall portion, and the other magnetic pole is arranged on a side surface of the valve chamber so as to be always located within a movement range of the permanent magnet; A first channel that opens in one of the first wall portion or the second wall portion and is opened and closed by the valve body; and a first channel that opens in the valve chamber and is always in communication with the valve chamber. An electromagnetic valve comprising two flow paths. 2. A third flow passage, which is opened in the other wall portion of the first wall portion or the second wall portion, and is opened and closed alternately with the first flow passage by the valve element. The solenoid valve according to claim 1, wherein: 3. The solenoid valve according to claim 1, wherein the second wall is made of a non-magnetic material. 4. The solenoid valve according to claim 1, wherein the second wall is made of a magnetic material.