JP2002250457A - Latch-type electromagnetic valve and four-way valve, and latch type electromagnetic coil therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a latch-type electromagnetic valve and a four-way valve and a latch type electromagnetic coil therefor, of which the release voltage range is controllable and of which the vibration-proof is superior with vibration hardly occurring and without causing malfunctions due to vibration, destruction or the like, and which is capable of applying to piping line high in pressure difference and moreover, which is compact. SOLUTION: The valve is provided with a tubular body for shifting a plunger whose one end is connected to a valve body, the plunger which is moveably arranged axially in the tubular body for shifting the plunger and whose one end is connected with a valve body, an induction element fastened to other end of the tubular body for shifting the plunger, so as to confront with the other end of the plunger, a biasing means interfaced between the plunger and the induction element so as to bias the plunger in a direction of separation from the induction element, a coil member arranged on the side of the valve body around outer periphery of the tubular body for shifting the plunger and a permanent magnet arranged on the side of the induction element around outer periphery of the tubular body for shifting the plunger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example,
The present invention relates to a latch-type solenoid valve which is disposed in a piping route of a refrigerant circulation cycle of a refrigerator, a freezer or the like, a control circuit of hydrogen / pure water, etc. and opens and closes a flow path, a four-way switching valve for switching a flow path, and a latch-type electromagnetic coil therefor. .

[0002]

2. Description of the Related Art Conventionally, for example, in a refrigerant circulation cycle of a cooling / heating system, a refrigerator, a freezer, etc., a latch type solenoid valve of the type shown in FIG. An electromagnetic valve 400 is used.
The latch-type solenoid valve 400 includes a valve body 402 and an electromagnetic operating coil 404 connected to the valve body 402 and controlling movement of a valve body disposed inside the valve body 402. The valve body 402 has a valve chamber 406, in which a first pipe 408 and a second pipe 410 are provided.
Are connected to communicate via a valve seat 412.

A valve body 414 such as a ball valve which opens and closes a fluid passage by moving in a direction away from the valve seat 412 is provided. Further, a plunger moving cylinder 416 having one end connected to the valve body 402.
The plunger 418 is disposed in the plunger moving cylinder 416 so as to be movable in the axial direction, and has a plunger 418 having one end connected to the valve 414.

Further, a suction element 420 is fixed to the other end of the plunger moving cylinder 416 so as to face the other end of the plunger 418. Between the plunger 418 and the suction element 420, an urging member 4 such as a coil spring for urging the plunger 418 in a direction away from the suction element.
22 are interposed. A permanent magnet 424 is fixed to an upper portion of the attracting element 420 to a fastening member 425 such as a bolt and the outer box member 430. This permanent magnet 424 is magnetized in a different direction in the axial direction,
The plunger 418 is arranged to generate a magnetic flux in a direction to be attracted to the attraction element 420, that is, to generate a magnetic pole to be attracted.

[0005] A coil member 426 that generates a magnetic flux when energized is disposed on the outer periphery of the plunger moving cylinder 416. In the figure, 428 is a bobbin case, 4
32 is a disk member, and 434 is a lead wire. In the electromagnetic valve 400 configured as above, the plunger 41 is energized by applying a voltage to the coil member 426 so as to generate a magnetic flux in the same direction as the magnetic flux of the permanent magnet 424.
By generating a magnetic flux in a direction in which the suction element 8 is attracted to the suction element 420, a suction force is generated. Accordingly, by adsorbing the plunger 418 to the suction element 420, the valve body 414 is moved away from the valve seat 412 to open the fluid passage, that is, the valve is opened. (See FIG. 16).

In this state, even if the power is cut off,
Since the attraction force of the permanent magnet 424 is set stronger than that of the urging member 422, the valve opening position is maintained. On the other hand, by energizing the coil member 426 so as to generate a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet 424, the plunger 418 is separated (separated) from the attraction element 420.
By generating the magnetic flux in the direction in which the magnetic flux is generated, the attractive force is reduced. When the suction force is smaller than the urging member 422, the urging force of the urging member 422 causes
The plunger 418 separates from the suction element 420 and the valve seat 4
The fluid passage is closed by moving the valve body 414 in the seating direction relative to the valve body 12, that is, the valve is closed (see FIG. 15).

Conventionally, for example, in a four-way switching valve 600 which is disposed in a piping path of a refrigerant circulation cycle of a cooling / heating, refrigerator, freezer or the like, and switches a flow path, a switching valve main body 602 and a switching mechanism portion are illustrated. A latch-type solenoid valve 200 as shown in FIG. 17 is used. The latch-type solenoid valve 200 of the four-way switching valve 600 has basically the same configuration as the above-described conventional latch-type solenoid valve 400, and the same reference numerals are added to the same components, and 100 is added. Reference numerals are given and detailed description thereof is omitted.

In this latch type solenoid valve 500, the valve body 5
02, a high pressure conduit 501 and a low pressure conduit 50
3 and a pair of conduits 505 and 507 are connected.
Then, while being connected to the plunger 518 and moving in the axial direction, the high-pressure conduit 501 is connected to one of the pair of conduits 505 and 507, and the low-pressure conduit 503 is connected to the other conduit. And a valve element 514 configured to be selectively switchable.

The switching valve body 602 is connected to the solenoid valve 50.
The high pressure pipe 604 connected to the high pressure pipe 501 of the solenoid valve 500 and the low pressure pipe 60 connected to the low pressure pipe 503 of the solenoid valve 500.
6 and a pair of pipes 608 and 610 are provided with a valve chamber 612 to be connected. The valve chamber 612 includes a pair of pistons 614 and 616 at both ends.
A switching valve 622 having a valve body 620 connected to the piston shaft 618 and slidable in the valve chamber 612 in the axial direction is provided.

Further, the pistons 614 and 616
A pair of cylinder chambers 624 and 626 respectively formed at both ends of the valve chamber 612 are formed. The pair of conduits 505 and 507 of the solenoid valve 500 are connected to a pair of cylinder chambers 624 and 626 of the switching valve main body 602, respectively. Thereby, in response to the switching of the solenoid valve 500, the switching valve 622 selectively slides in the axial direction due to the pressure difference between the cylinder chambers 624 and 626, and the high-pressure pipe 604
Is connected to one of the pair of pipes 608 and 610, and the low-pressure pipe 606 is selectively switched so as to be connected to the other pipe.

[0011]

By the way, in the conventional latch type solenoid valve 500 of the four-way switching valve 600, the disk member 532 and the permanent magnet 524 protrude from the top of the electromagnetic portion (coil portion 504). Therefore, as shown in FIG. 20, in the four-way switching valve 600, when the solenoid valve 500 is mounted on the switching valve main body 602 in a horizontal state using the mounting bracket 630, the mounting portion of the bracket is used. Moment, the vibration resistance is not good, leading to breakage and noise.

Further, as described above, in the four-way switching valve 600, when the vibration is large, and when the difference in the operating pressure of the refrigerant circuit or the like using the four-way switching valve is large, the retention of the adsorption state is improved, In order to improve the vibration property, it is necessary to increase the magnetic force of the permanent magnet 524 of the solenoid valve 500. For this purpose, the thickness of the permanent magnet 524 itself must be increased, and in the four-way switching valve 600 having the conventional structure,
As the thickness of the permanent magnet 524 increases, the solenoid valve 50
The size of the air conditioner itself increases, and as a result, the size of the entire air conditioner also increases.

Further, in order to increase the attraction force of the permanent magnet 524, it is sufficient to use a ferromagnetic material for the magnet itself, but this increases the cost. In addition, in the conventional latch type solenoid valve 400 and the latch type solenoid valve 500 of the four-way switching valve 600, as shown by an arrow B in FIG.
For the coils 404, 504, the plungers 418, 5
When the electric current is generated so as to generate a magnetic flux in the opposite direction to the magnetic fluxes of the permanent magnets 424 and 524 in order to cause the permanent magnets 424 and 524 to separate from the attractors 420 and 520, most of the magnetic fluxes generated by the coils 404 and 504 To pass
The magnetic force of the permanent magnets 424, 524 will be demagnetized.

Therefore, for the coils 404 and 504,
In order to attract the plungers 418, 518 to the attracting elements 420, 520, when electricity is supplied to generate magnetic flux in the same direction as the magnetic flux of the permanent magnets 424, 524, the attracting force by the permanent magnets is insufficient, and the attracting cannot be performed. It may be in a state and not operate. In view of such circumstances, the present invention has good vibration resistance, generates little vibration, does not cause malfunction due to vibration, breakage, etc., can be applied to a piping system having a high pressure difference, and is compact. An object of the present invention is to provide a latch type solenoid valve and a four-way switching valve, and a latch type solenoid coil therefor.

[0015]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned objects and objects of the prior art. A latch-type solenoid valve according to the present invention comprises a valve seat, A valve body having a valve body that opens and closes a fluid passage by moving in a direction to be seated and separated from the valve seat, and an electromagnetic actuation coil connected to the valve body and controlling movement of the valve body. Wherein the electromagnetic actuating coil is provided with a plunger moving cylinder one end of which is connected to the valve body, and is disposed movably in the axial direction within the plunger moving cylinder, and one end of the valve body is connected to the plunger moving cylinder. A plunger, a suction element fixed to the other end of the plunger moving cylinder so as to face the other end of the plunger, and the plunger so as to urge the plunger in a direction away from the suction element. Between the suction element An interposed urging member, a coil member disposed on the valve body side on the outer periphery of the plunger moving cylinder, and a coil member disposed on the outer periphery of the plunger moving cylinder on the suction element side. The permanent magnet is arranged such that the permanent magnet is magnetized in a different direction in the axial direction and generates a magnetic pole for attracting the plunger to the attraction element, and the coil member is formed of the permanent magnet. By energizing the coil member so as to generate a magnetic flux in the same direction as the magnetic flux of the plunger, the plunger is attracted to the suction element, and the valve body is moved away from the valve seat in the fluid separating direction. And the plunger is separated from the attraction element by the force of the urging member by energizing the coil member so that the coil member generates a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet. So it is characterized by being configured so as to close the passage of fluid by moving in a direction to seat the valve body against the valve seat.

In the four-way switching valve of the present invention, the high-pressure conduit, the low-pressure conduit, and the pair of conduits connect the high-pressure conduit to one of the pair of conduits, and connect the low-pressure conduit to the other conduit. A high pressure pipe connected to a high pressure pipe of the solenoid valve, and a low pressure pipe connected to a low pressure pipe of the solenoid valve. And a pair of pipes, a valve chamber to be connected, and a pair of pistons at both ends, including a valve body connected to the piston shaft, a switching valve slidable in the valve chamber in the axial direction. A switching valve body having a pair of cylinder chambers respectively formed at both ends of the valve chamber by the piston, and a pair of conduits of the solenoid valve, respectively, and a pair of cylinder chambers of the switching valve body. Connected to the electromagnetic The switching valve selectively slides in the axial direction due to the pressure difference in the cylinder chamber of the switching valve body in accordance with the switching of the switching valve body, and connects the high-pressure pipe to one of the pair of pipes. A four-way switching valve configured to be selectively switchable so as to connect the low-pressure pipe to the other pipe, wherein the latch-type solenoid valve moves in the axial direction, thereby connecting the high-pressure pipe to a pair. A valve body having a valve body configured to be selectively switchable so as to connect to one of the conduits and to connect the low-pressure conduit to the other conduit, and to be connected to the valve body. An electromagnetic actuation coil for controlling the movement of the valve body, wherein the electromagnetic actuation coil is axially movable into the plunger movement cylinder having one end connected to the valve body and the plunger movement cylinder. Arranged in front A plunger having one end connected to the valve body, a suction element fixed to the other end of the plunger moving cylinder so as to face the other end of the plunger, and a plunger attached in a direction away from the suction element. An urging member interposed between the plunger and the suction element so as to urge the coil; a coil member disposed on the valve body side on an outer periphery of the plunger moving cylinder; A permanent magnet disposed on the side of the attraction element on the outer periphery of the cylindrical body, wherein the permanent magnet is magnetized in a different direction in the axial direction and generates a magnetic pole for attracting the plunger to the attraction element. A first operating state in which the coil member generates a magnetic flux in the same direction as the magnetic flux of the permanent magnet so that the plunger is attracted to the suction element by energizing the coil member; Said carp By energizing the coil member so that the core member generates a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet,
The plunger can be switched to a second operation state in which the plunger is separated from the suction element by a force of the urging member.

Further, the latch type electromagnetic coil of the present invention
A plunger moving cylinder, a plunger disposed axially movably in the plunger moving cylinder, and affixed to the other end of the plunger moving cylinder so as to face the other end of the plunger. An opening for accommodating the suction element and a biasing member interposed between the plunger and the suction element so as to urge the plunger in a direction away from the suction element; A coil member disposed on the side away from the attraction element on the outer periphery of the portion; and a permanent magnet disposed on the attraction element side on the outer periphery of the opening, wherein the permanent magnet is disposed in the axial direction. The magnets are arranged to generate magnetic poles for attracting the plunger to the attraction element, and the coil member generates a magnetic flux in the same direction as the magnetic flux of the permanent magnet. Energize coil members By energizing the coil member such that the plunger is attracted to the suction element in a first operating state and the coil member generates a magnetic flux in a direction opposite to the magnetic flux of the permanent magnet, The plunger can be switched between a second operating state in which the plunger is separated from the suction element by a force.

As described above, the coil member is disposed on the valve body side on the outer periphery of the plunger moving cylinder, and the permanent magnet is disposed on the attraction element side on the outer periphery of the plunger moving cylinder. Therefore, it is possible to control (change) the detachment voltage, that is, the voltage required to separate (separate) the plunger from the suction element from the state in which the plunger is attracted to the suction element. For this reason, it is possible to reliably operate at the rated voltage without adding a resistor or the like to the circuit as in the related art.

In addition, unlike the prior art, the permanent magnet and the like do not protrude from the top of the electromagnetic portion (coil portion), so that the solenoid valve is compact and lightweight, and switches the electromagnetic valve like a four-way switching valve. When used with the mounting bracket mounted horizontally with respect to the valve body, the moment can be reduced, so the vibration resistance is good, there is little vibration, and malfunction due to vibration, breakage, etc. occur. There is no noise and no noise.

Further, the thickness of the permanent magnet can be increased without increasing the size of the solenoid valve.
The magnetic force of the permanent magnet can be increased, and the four-way switching valve has good retention of the adsorbed state and good vibration resistance even when the vibration is large and the difference in operating pressure of the refrigerant circuit using the four-way switching valve is large. Can be improved. Also, for the coil, to release the plunger from the suction element,
When current is supplied to generate a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet, most of the magnetic flux generated by the coil does not pass through the permanent magnet, so that the magnetic force of the permanent magnet is not demagnetized.

Accordingly, when the coil is energized so as to generate a magnetic flux in the same direction as the magnetic flux of the permanent magnet in order to attract the plunger to the coil, the plunger does not run out of the attractive force of the permanent magnet. Can be adsorbed to the suction element, and it operates reliably. Further, the present invention is characterized in that an outer box member that forms a part of a magnetic path of the magnetic flux of the coil member and the permanent magnet and accommodates the coil of the coil member is provided.

Thus, a magnetic path by the permanent magnet and a magnetic path by the coil member can be formed around the coil member, and the operability is improved. Further, in the present invention, the lower end position of the inner wall on the permanent magnet side of the outer box member accommodating the coil member is set so as to be between the upper end position of the attracting element and the position of the upper end surface of the plunger at the separated position. It is characterized by having been done.

In the present invention, the lower end position of the inner wall of the outer case member for housing the coil member on the permanent magnet side is between the lower end position of the attraction element and the position of the upper end surface of the plunger located at the separated position. Is set as follows. By setting the lower end position of the inner wall on the permanent magnet side of the outer box member housing the coil member in such a range,
Suction retention, that is, excellent retention when the plunger is in contact with the suction element, detachment retention, that is, excellent retention when the plunger is separated from the suction element, as well as release from these states It can be done quickly and reliably.

In addition, it is possible to control (change) the detachment voltage, that is, the voltage required to separate (separate) the plunger from the suction element from the state in which the plunger is attracted to the suction element. For this reason, it is possible to reliably operate at the rated voltage without adding a resistor or the like to the circuit as in the related art. Furthermore, in the present invention, at the end of the outer box member on the valve body side, when the coil member is arranged, a pressing opening for pressing the coil from below toward the permanent magnet side is formed. It is characterized by.

With this configuration, when integrally forming the electromagnetic operating portion composed of the coil member, the permanent magnet, the outer box member, and the like with the mold resin, the pressing portion of the outer box member is pressed through the opening hole. By pressing upward, the outer case member can be pressed against the permanent magnet via the coil member. Therefore, since there is no gap between the permanent magnet and the outer box member, the mold resin enters between the permanent magnet and the outer box member, and a gap is generated to reduce the magnetic force of the permanent magnet. The operation can be reliably performed without unstable operation.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments (examples) of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal section showing a first embodiment of the latch type solenoid valve of the present invention. As shown in FIG. 1, a latch-type solenoid valve 1 includes, for example, a refrigerant circulation cycle of a cooling / heating, refrigerator, freezer, or the like;
It is provided in a piping path of a control circuit of hydrogen / pure water and the like, and is used to open and close a flow path.

The latch-type solenoid valve 1 has a valve body 2 and an electromagnetic coil 4 connected to the valve body 2 and controlling the movement of a valve element disposed inside the valve body 2. .
The valve body 2 has a valve chamber 6, and a first chamber is provided in the valve chamber 6.
And the second pipe 10 are connected so as to communicate with each other via a valve seat 12. A valve element 14 such as a ball valve that opens and closes a fluid passage by moving in a direction in which the valve seat 12 separates from the valve seat 12 is provided. Further, a plunger moving cylinder 16 having one end connected to the valve body 2 is provided. The plunger moving cylinder 16 is axially movable in the plunger moving cylinder 16 and one end is connected to the valve body 14. A plunger 18 is provided.

A suction element 20 is fixed to the other end of the plunger moving cylinder 16 so as to face the other end of the plunger 18. Between the plunger 18 and the suction element 20,
An urging member 22 composed of a coil spring or the like for urging the plunger 18 in a direction away from the suction element 20 is interposed. The plunger 18 and the suction element 20
Are made of a magnetic material in order to form a part of a magnetic circuit as described later.

On the outer periphery of the plunger moving cylinder 16, a coil member 26 configured to generate a magnetic flux by energization by winding a copper wire around a bobbin case 28 on the valve body 2 side. Are located. The coil member 26 is disposed so as to be housed inside an outer box member 30 made of a magnetic member and having a substantially U-shaped cross section in order to form a magnetic circuit. The coil member 26 is connected to a lead wire 34 for supplying electricity to the coil member 26.

A permanent magnet 24 is disposed on the outer periphery of the plunger moving cylinder 16 on the side of the attraction element 20. On the upper part of the permanent magnet 24, a disk member 32 made of a magnetic member is fixed to the attraction element 20 by a fastening member 36 such as a bolt in order to form a part of a magnetic path by the permanent magnet 24. The permanent magnet 24 may be magnetized in a different direction in the axial direction, and may be arranged so as to generate a magnetic pole that causes the plunger 18 to be attracted to the attraction element 20. Either position of the pole may be on the upper side or the lower side. In this embodiment, for convenience of explanation, as shown in FIG.
, That is, the case where the N pole is located on the plunger 18 side will be described.

By the way, the electromagnetic operating portion including the coil member 26, the outer box member 30, the permanent magnet 24, the disk member 32, and the like is integrally formed of a molding resin. In this case, if there is a gap between the permanent magnet 24 and the outer box member 30, the gap will increase the magnetic resistance on the magnetic circuit, thereby reducing the attraction force and failing to operate reliably. There is a risk. For this reason, in the present invention, as shown in FIG. 2, when arranging the coil member 26 at the end portion 30a of the outer box member 30 on the valve body 2 side, a coil is attached from below to a suitable support rod. Permanent magnet 2
A plurality of (three in this embodiment) pressing opening holes 30b for pressing on the four sides are formed. In addition,
In this case, the number of the pressing openings 30b is not particularly limited.

By providing the opening 30b for pressing as described above, the coil member 26 is arranged, and the electromagnetic operating portion composed of the coil member 26, the permanent magnet 24, and the outer box member 30 is integrally molded with the molding resin. At this time, the coil member 26 can be pressed against the permanent magnet 24 from below via a suitable support rod member or the like. Therefore, for example, as shown in FIG. 3A, in order to position the coil member 26 between the outer box members 30, the distance between the upper and lower inner peripheral ends 30 c of the outer box member 30 is small and narrow. 3B, the space between the upper and lower inner peripheral ends 30c of the outer box member 30 is parallel, as shown in FIG.
(C), upper and lower inner peripheral ends 30c of the outer box member 30
In any case where the distance between the outer member 30 and the lower member 24a of the permanent magnet 24 of the coil member 26 is large as shown in FIG.
Then, it is crimped via the bobbin case 28.
Thereby, the upper part 30 d of the outer box member 30 and the permanent magnet 24
There is no gap between the lower end 24a of the permanent magnet 2
The mold resin may enter between the outer box member 4 and the outer box member 30 to form a gap, and the gap may increase the magnetic resistance on the magnetic circuit, thereby reducing the attraction force and causing unstable operation. And it can operate reliably.

In this case, a gap is formed between the lower end 28a of the bobbin case 28 and the outer casing member 30, but even if the mold resin enters the gap, there is no effect on the performance. In this embodiment, as shown in FIG. 1, the lower end position 30 e of the inner wall on the permanent magnet 24 side of the outer box member 30 that accommodates the coil member 26 is shifted from the upper end position 20 a of the attraction element 20.
The plunger 18 is set to be located between the positions 18a on the upper end surface of the plunger 18 at the separated position.

Preferably, the lower end position 30e of the inner wall of the outer box member 30 that houses the coil member 26 on the permanent magnet 24 side.
Is desirably set to be between the lower end position 20b of the suction element 20 and the position 18a on the upper end surface of the plunger 18 at the separated position. Specifically, the outer box member 3
As the lower end position 30e of the inner wall of the 0 permanent magnet 24 side,
As shown in FIG. 4, the lower end position 30 e of the inner wall of the outer box member 30 on the permanent magnet 24 side and the lower end position 20 b of the attraction element 20
Is smaller than the lower end position 20b of the suction element 20.
It is desirable to set the range from 0 to 9 mm upward, preferably from 0 to 1.8 mm downward.

That is, the outer box member 30 falls within such a range.
By setting the lower end position 30e of the inner wall on the side of the permanent magnet 24, the suction holding property, that is, the holding property when the plunger 18 is in contact with the attraction element 20, the detaching holding property,
In other words, the plunger 18 is excellent in retention of the state in which the plunger 18 is separated from the suction element 20, and can be quickly and reliably separated from these states.

In this embodiment, as shown in FIG. 1, the permanent magnet 24 having a size extending in the axial direction between the disk member 32 and the outer box member 30 is used. Although not shown, any one of the upper and lower portions or the intermediate portion of the axial length between the disk member 32 and the outer box member 30 is disposed or an intermediate portion, and the remaining portion is interposed with a magnetic material spacer. Is also good.

In the above embodiment, as shown in FIG. 1, the cornering coil 17 is provided at the lower end 20b of the suction element 20, but it is also possible not to provide this. The latch-type solenoid valve 1 configured as described above operates as follows. FIG. 4 shows the valve closed state. That is, the plunger 18 is separated from the suction element 20,
By moving the valve element 14 in the seating direction with respect to the valve seat 12, the fluid passage is closed, that is, the valve is closed.

In this state, as shown schematically in the left half of FIG. 4, when the coil member 26 is not energized, the magnetic flux generated by the permanent magnet 24 causes the magnetic flux generated by the permanent magnet 24 to move away from the N pole of the permanent magnet 24. A magnetic circuit is formed that passes through the box member 30, the plunger 18, the attraction element 20, and the disk member 32 and reaches the S pole of the permanent magnet. The magnetic flux generated by the permanent magnet 24 forms a magnetic circuit from the N pole of the permanent magnet 24 to the S pole of the permanent magnet through the outer case member 30, the attraction element 20, and the disk member 32.

In this state, the urging force for urging the plunger 18 in the direction away from the attraction element 20 by the urging member 22 is larger than the attraction force for attracting the plunger 18 to the attraction element 20 by the magnetic circuit. The valve can be kept closed. In this state, in the same direction as the magnetic flux (magnetic circuit) of the permanent magnet 24, the magnetic flux (magnetic circuit)
Is applied (voltage is applied) to the coil member 26 so as to generate the following.

As shown schematically in the right half of FIG. 4, the magnetic flux generated by the coil member 26 causes the outer box member 30 to reach the outer box member 30 through the plunger 18 and the suction element 20. A magnetic circuit is formed. Therefore, the applied voltage is set such that the attraction force of these magnetic circuits for attracting the plunger 18 to the attraction element 20 is greater than the urging force of the urging member 22 for urging the plunger 18 away from the attraction element 20. By adjusting, the plunger 1 is moved as shown by the arrow C in FIG.
8 instantaneously moves in the direction of the suction element 12 and is sucked. Thereby, as shown in FIG. 5, the valve body 14 moves in the direction away from the valve seat 12 to open the fluid passage, that is, the first pipe 8 and the second pipe 10
However, it communicates via the valve seat 12 to open the valve.

In this state, when the power supply to the coil member 26 is cut off, the power is generated by the permanent magnet 24 when the power supply to the coil member 26 is not supplied, as schematically shown in the left half of FIG. By the magnetic flux, the outer box member 30, the plunger 18, the attraction element 2 are moved from the N pole of the permanent magnet 24.
0, a magnetic circuit passing through the disk member 32 and reaching the S pole of the permanent magnet is formed. Also, the magnetic flux generated by the permanent magnet 24 causes the outer pole member 3
A magnetic circuit is formed through the zero, the attraction element 20, and the disk member 32 to reach the S pole of the permanent magnet.

In this state, the attraction force of these magnetic circuits for attracting the plunger 18 to the attraction element 20 is larger than the urging force of the urging member 22 for urging the plunger 18 away from the attraction element 20, The valve can be kept open. Then, in this state, the coil member 26 is energized (voltage applied) so as to generate a magnetic flux (magnetic circuit) in a direction opposite to the magnetic flux (magnetic circuit) of the permanent magnet 24.

Thus, as schematically shown in the right half of FIG. 5, the magnetic flux generated by the coil member 26 causes the outer box member 30 to reach the outer box member 30 through the suction element 20 and the plunger 18. A magnetic circuit is formed. Therefore, the applied voltage (so that the urging force for urging the plunger 18 in the direction away from the attraction element 20 by the urging member 22 is larger than the attraction force for attracting the plunger 18 to the attraction element 20 by these magnetic circuits. By adjusting the release voltage, the plunger 18 instantaneously moves in the direction away from the suction element 12 and separates as shown by the arrow D in FIG. Thereby, as shown in FIG.
The fluid passage is closed by moving the valve body 14 in the seating direction with respect to the valve seat 12, that is, the first pipe 8
The second pipe 10 is closed by the valve body 14 so as to close the valve.

As an example, the lower end position 30e of the inner wall of the outer box member 30 on the permanent magnet 24 side is indicated by a dotted line in FIG.
Is smaller than the lower end position 20b of the suction element 20.
4 shows a voltage-rising force (attraction force) characteristic in a case where the distance is 3.4 mm in the upward direction with respect to the lower end position 20b. Thus, the suction holding property, that is, the plunger 1
It is excellent in the holding property of the state where the plunger 18 is in contact with the contact piece 8, that is, the holding property of the plunger 18 in the state where the plunger 18 is separated from the suction element 20, and is quickly and reliably released from these states. Can be.

FIG. 7 is a longitudinal section showing a second embodiment of the latch type solenoid valve of the present invention. The latch-type solenoid valve of this embodiment has basically the same structure as the latch-type solenoid valve 1 of the first embodiment shown in FIG.
The same reference numerals are given and the detailed description is omitted. In this embodiment, the lower end position 30e of the inner wall of the outer box member 30 on the permanent magnet 24 side is set to be between the lower end position 20b of the attraction element 20 and the position 18a of the upper end surface of the plunger 18 at the separated position. Have been.

The operation of the latch-type solenoid valve 1 of the second embodiment constructed as described above is almost the same as that of the first embodiment, as shown in FIGS. In the latch type solenoid valve 1 of this embodiment, as schematically shown in the right half of FIG. 8, when the valve shifts from the valve closed state to the valve open state, the plunger 18 is attracted to the suction element 20 by the magnetic circuit. The suction force is generated, and the state shifts to the valve open state. When the valve is in the open state, as shown schematically in the left half of FIG. 9, when the coil member 26 is not energized, the N pole of the permanent magnet 24 is generated by the magnetic flux generated by the permanent magnet 24. From
A magnetic circuit is formed that passes through the outer box member 30, the plunger 18, the attraction element 20, and the disk member 32 and reaches the S pole of the permanent magnet. Therefore, the holding force for holding the valve open state is increased by the magnetic circuit.

Therefore, the latch type solenoid valve 1 of this embodiment is more excellent in the suction holding property and the separation holding property than the latch type solenoid valve 1 of the first embodiment. As an example,
6, the axial distance L between the lower end position 30e of the inner wall of the outer box member 30 on the permanent magnet 24 side and the lower end position 20b of the attraction element 20 is based on the lower end position 20b of the attraction element 20. The graph shows the voltage-rising force (attraction force) characteristics when the distance is 1.6 mm downward.

As is clear from the characteristic diagrams of the first and second embodiments, the lower end position 30e of the inner wall of the outer box member 30 on the permanent magnet 24 side and the lower end position 20b of the attraction element 20
It is possible to control the voltage range of the departure by changing the axial distance L between. 10 and 11
1 is a longitudinal sectional view showing a first embodiment of a four-way switching valve of the present invention, and FIG. 12 is a schematic circuit diagram showing a connection state thereof.

The four-way switching valve 300 of the present invention is disposed in a piping path of a refrigerant circulation cycle of a cooling / heating, refrigerator, freezer, or the like, and switches a flow path. The four-way switching valve 300 of this embodiment includes a switching valve body 302 and a latching solenoid valve 200 as a switching mechanism. This latch type solenoid valve 200
The latch-type solenoid valve 1 of the first embodiment shown in FIG. 1 has basically the same configuration, and the same components are denoted by the same reference numerals with the reference numbers increased by 200, and are described in detail. Is omitted.

In the latch type solenoid valve 200, the valve body 2
02, the high pressure conduit 201 and the low pressure conduit 20
3 and a pair of conduits 205 and 207 are connected.
The valve body 214 is connected to the plunger 218 via an operation shaft 219. This valve element 214
By moving in the axial direction, the high pressure conduit 201 is connected to one of the pair of conduits 205 and 207, and the low pressure conduit 203 is connected to the other conduit.
It is configured to be selectively switchable.

On the other hand, the switching valve body 302 is
High-pressure pipe 304 connected to the high-pressure pipe 201 of the solenoid valve 200 and a low-pressure pipe 306 connected to the low-pressure pipe 203 of the solenoid valve 200.
And a pair of pipes 308 and 310 are connected to the valve chamber 3
12 are provided. The valve chamber 312 includes a pair of pistons 314 and 316 at both ends and a valve body 320 connected to the piston shaft 318.
A switching valve 322 slidable in the valve chamber 312 in the axial direction is provided.

Further, the pistons 314 and 316
A pair of cylinder chambers 324 and 326 are formed at both ends of the valve chamber 312, respectively. The pair of conduits 205 and 207 of the solenoid valve 200 are connected to a pair of cylinder chambers 324 and 326 of the switching valve body 302, respectively. Thereby, in response to switching of the solenoid valve 200, the switching valve 322 is selectively slid in the axial direction due to the pressure difference between the cylinder chambers 324 and 326 of the switching valve body 302, and the high-pressure pipe 304 is connected to the pair of pipes 308. , 310 and the low pressure pipe 306 is selectively switchable so as to be connected to the other pipe.

That is, the switching valve body 302 is
32, an accumulator 334, a capillary 336, an indoor heat exchanger 338, and an outdoor heat exchanger 340, which are interposed in a refrigerant circuit 330. The switching valve body 302 switches the direction of the refrigerant flowing through the refrigerant circuit 330. Thus, switching between the cooling circuit and the heating circuit is performed.

More specifically, the state shown in FIG. 10 is similar to the valve closed state shown in FIG. 4, in which the plunger 18 of the latch type solenoid valve 200 is separated from the suction element 20.
In the operating state, the valve element 214 of the latch type solenoid valve 200 moves to the left. In the initial state of this state, FIG.
As shown in (2), the valve body 320 of the switching valve 322 of the switching valve body 302 is in a state of moving to the right, and the high-pressure fluid compressed via the accumulator 334 and the compressor 332 is subjected to the high pressure fluid of the switching valve body 302. As shown by a dotted line in FIG. 12, through the pipe (D joint) 304 and the valve chamber 312 via the pipe (E joint) 308, the indoor heat exchanger 338 is reached.

In this state, the high-pressure fluid compressed via the accumulator 334 and the compressor 332 is supplied to the switching valve body 3
02 through a high-pressure pipe (D-joint) 304 of the latch-type solenoid valve 200 through a high-pressure pipe (D-capillary tube) 201, and from the valve chamber 206 to a pipe (C-capillary tube)
207, the cylinder chamber 326 of the switching valve body 302
Will be introduced.

On the other hand, the cylinder chamber 32 of the switching valve body 302
The fluid in 4 is a conduit 205 (E capillary tube)
205, a low-pressure conduit (S capillary tube) of the latch type solenoid valve 200 via a pipe (E coupling) 308.
As shown by a dotted line in FIG. 12, the fluid reaches the low-pressure pipe (S joint) 306 and returns from the accumulator 334 to the compressor 332 again.

Since the pressure in the cylinder chamber 326 of the switching valve body 302 is higher than the pressure in the cylinder chamber 324 of the switching valve body 302, the valve of the switching valve 322 of the switching valve body 302 is changed. The body 320 moves to the left and is in the state shown in FIG. In this state, the high-pressure fluid compressed via the accumulator 334 and the compressor 332 is supplied to the high-pressure pipe (D joint) 30 of the switching valve body 302.
4, flows from the valve chamber 312 to the pipe (C joint) 310, and as shown by the solid line in FIG.
It flows to zero.

On the other hand, the low-pressure fluid that has passed through the outdoor heat exchanger 340, the capillary 336, and the indoor heat exchanger 338, as shown by the solid line in FIG. Switching valve 322 via an E-joint 308
The valve body 320 of this embodiment reaches the low-pressure pipe (S joint) 306, and returns to the compressor 332 from the accumulator 334 again. The above state is the cooling state.

From the cooling state, the second operating state in which the plunger 18 is attracted to the suction element 20 in the latch-type solenoid valve 200 as in the state shown in FIG. 11, that is, the valve open state shown in FIG. Then, the valve element 214 of the latch type solenoid valve 200 is moved rightward. In the initial state of this state, as shown in FIG. 10, the valve body 320 of the switching valve 322 of the switching valve body 302 has been moved to the left,
The high-pressure fluid compressed via the accumulator 334 and the compressor 332 is supplied to a high-pressure pipe (D joint) of the switching valve body 302.
304, the pipe 310 (C joint) 3
10, the outdoor heat exchanger 340 is reached as shown by the solid line in FIG.

In this state, the high-pressure fluid compressed via the accumulator 334 and the compressor 332 is supplied to the switching valve body 3
02 through a high-pressure pipe (D-joint) 304 of the latch-type solenoid valve 200, a high-pressure pipe (D-capillary tube) 201, and from the valve chamber 206 via a conduit 205 (E-capillary tube) 205 to the cylinder of the switching valve body 302. It is introduced into the chamber 324.

On the other hand, the cylinder chamber 32 of the switching valve body 302
The fluid in 6 is a conduit (C capillary tube) 207
Through the low-pressure conduit (S-capillary tube) 203 of the latch-type solenoid valve 200 and through the low-pressure pipe (S-joint) 306
Then, as shown by the solid line in FIG. 12, the flow is returned from the accumulator 334 to the compressor 332 again.

As a result, the pressure in the cylinder chamber 324 of the switching valve body 302 is higher than the pressure in the cylinder chamber 326 of the switching valve body 302. The body 320 has moved to the right and is in the state shown in FIG. In this state, the high-pressure fluid compressed via the accumulator 334 and the compressor 332 is supplied to the high-pressure pipe (D joint) 30 of the switching valve body 302.
4, flows from the valve chamber 312 to the pipe (E joint) 308, and as shown by the dotted line in FIG.
8 flows.

On the other hand, the low-pressure fluid that has passed through the indoor heat exchanger 338, the capillary 336, and the outdoor heat exchanger 340, as shown by the dotted line in FIG. Switching valve 322 via a C joint 310
The valve body 320 reaches the low-pressure pipe (S joint) 306 and returns to the compressor 332 again. The above state is the heating state.

According to the four-way switching valve 300 of this embodiment,
Since it is excellent in the adsorption holding property and the desorption holding property, the departure from these states can be performed quickly and surely, so that it is possible to reliably switch between the cooling state and the heating state. In addition, it is possible to control (change) the detachment voltage, that is, the voltage required to separate (separate) the plunger 218 from the suction element 20 from the state in which the plunger 218 is adsorbed to the suction element 220. Therefore, the switching operation between the cooling state and the heating state can be reliably performed at the rated voltage without adding a resistor or the like to the circuit as in the related art.

FIG. 13 is a longitudinal sectional view similar to FIG. 10 showing a second embodiment of the four-way switching valve of the present invention. The four-way switching valve 300 of this embodiment has basically the same configuration as the four-way switching valve 300 of the first embodiment shown in FIG.
The same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the four-way switching valve 300 of this embodiment, the latching solenoid valve 1 of the first embodiment shown in FIG. That is, in this embodiment, the axial length L of the permanent magnet 224 is
The position 224 a of the valve body side end portion 224 is set to be substantially the same as the height of the suction element 220. According to the four-way switching valve 300 of this embodiment, the suction holding property and the desorption holding property are more excellent, and the departure from these states can be performed quickly and reliably, so that the cooling state and the heating state can be reliably performed. Switching is possible.

Moreover, the separation voltage, that is, the suction element 22
From the state in which the plunger 218 is attracted to zero, the voltage required to separate (separate) the plunger 218 from the suction element 20 can be more controlled (changed). Therefore, the switching operation between the cooling state and the heating state can be reliably performed at the rated voltage without adding a resistor or the like to the circuit as in the related art.

In the above embodiment, a latch type solenoid valve,
Although the four-way switching valve has been described, as shown in FIG. 14, the electromagnetically actuated coil 4 of the latch type solenoid valve 1 shown in FIGS. 1 and 7, that is, the plunger moving cylinder 1
6, the electromagnetic actuating portion including the coil member 26, the outer box member 30, the permanent magnet 24, the disk member 32, and the lead wire 34 from which the plunger 18, and the attraction element 20 have been removed, is detachable to form the latch-type electromagnetic coil 3. You can also.

In the above embodiment, for example,
The case where it is installed in the refrigerant circulation cycle of refrigerators, freezers, etc. was shown, but the piping routes of corrosive fluids, the piping routes of control circuits for hydrogen and pure water, and the piping of various other plants such as petroleum refining plants Various changes can be made without departing from the present invention, such as being applicable to the present invention.

[0070]

As described above, according to the present invention,
A coil member is arranged on the valve body side on the outer periphery of the plunger moving cylinder, and a permanent magnet is arranged on the attraction element side on the outer periphery of the plunger moving cylinder. Since a permanent magnet does not protrude from the top of the electromagnetic part (coil part), it is compact and lightweight,
Moreover, when the solenoid valve is mounted on the switching valve body in a horizontal state with a mounting bracket, such as a four-way switching valve, the moment can be reduced.
Vibration resistance is good, there is little vibration, no malfunction or breakage due to vibration occurs, and no noise is generated.

Further, the thickness of the permanent magnet can be increased without increasing the size of the solenoid valve.
The present invention can be applied to a case where the magnetic force of the permanent magnet can be increased and the four-way switching valve has a large vibration, and a case where there is a large difference in operating pressure in a refrigerant circuit or the like using the four-way switching valve. In addition, when the coil is energized so as to generate a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet in order to separate the plunger from the attraction element, most of the magnetic flux generated by the coil does not pass through the permanent magnet. Therefore, the magnetic force of the permanent magnet is not demagnetized.

Accordingly, when the coil is energized so as to generate a magnetic flux in the same direction as the magnetic flux of the permanent magnet in order to attract the plunger to the attraction element, the plunger does not run short of the attractive force of the permanent magnet. Can be adsorbed to the suction element, and it operates reliably. Further, according to the present invention, the lower end position of the inner wall on the permanent magnet side of the outer casing member that accommodates the coil member is located between the upper end position of the attraction element and the position of the upper end surface of the plunger at the separated position. Preferably, the lower end position of the inner wall on the permanent magnet side of the outer box member that houses the coil member is set so as to be between the lower end position of the attracting element and the position of the upper end surface of the plunger at the separated position. So
Suction retention, that is, excellent retention when the plunger is in contact with the suction element, detachment retention, that is, excellent retention when the plunger is separated from the suction element, as well as release from these states It can be done quickly and reliably.

Further, it is possible to control (change) the detachment voltage, that is, the voltage required to separate (separate) the plunger from the suction element from the state in which the plunger is adsorbed to the suction element. For this reason, it is possible to reliably operate at the rated voltage without adding a resistor or the like to the circuit as in the related art. Furthermore, according to the present invention, when integrally forming the electromagnetic operating portion including the coil member, the permanent magnet, and the outer box member with the mold resin, the upper portion is pressed upward through the pressing opening hole of the outer box member. Thus, the outer box member can be pressed against the permanent magnet via the coil member.

Therefore, no gap is formed between the permanent magnet and the outer box member, so that the mold resin enters between the permanent magnet and the outer box member, and a gap is generated to reduce the magnetic force of the permanent magnet. Thus, the present invention is an extremely excellent invention that has many remarkable and unique functions and effects such as reliable operation without unstable operation.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a first embodiment of a latch type solenoid valve of the present invention.

FIG. 2 is a bottom view of an outer case member of the latch-type solenoid valve of the present invention.

FIG. 3 is a schematic sectional view for explaining a use state of an outer case member of the latch type solenoid valve of the present invention.

FIG. 4 is a schematic view illustrating a closed state of the latch type solenoid valve of the present invention.

FIG. 5 is a schematic diagram illustrating a valve-open state of the latch-type solenoid valve of the present invention.

FIG. 6 is a graph showing an applied voltage and a rising force of the latch type solenoid valve of the present invention.

FIG. 7 is a longitudinal section showing a second embodiment of the latch type solenoid valve of the present invention.

FIG. 8 is a schematic diagram illustrating a closed state of a latch-type solenoid valve according to a second embodiment of the present invention.

FIG. 9 is a schematic diagram for explaining a valve-open state of a latch-type solenoid valve according to a second embodiment of the present invention.

FIG. 10 is a longitudinal sectional view showing a cooling state of the first embodiment of the four-way switching valve of the present invention.

FIG. 11 is a longitudinal sectional view showing a heating state of the first embodiment of the four-way switching valve of the present invention.

FIG. 12 is a schematic circuit diagram showing a connection state of the first embodiment of the four-way switching valve of the present invention.

FIG. 13 is a longitudinal sectional view showing a cooling state of the second embodiment of the four-way switching valve of the present invention.

FIG. 14 is a longitudinal sectional view of the latch type electromagnetic coil of the present invention.

FIG. 15 is a vertical cross-sectional view showing a closed state of a conventional latch-type solenoid valve.

FIG. 16 is a longitudinal sectional view showing a valve-open state of a conventional latch-type solenoid valve.

FIG. 17 is a longitudinal sectional view showing a cooling state of a conventional four-way switching valve.

FIG. 18 is a perspective view of a conventional four-way switching valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Latch type electromagnetic valve 2 Valve body 3 Latch type electromagnetic coil 4 Electromagnetic actuation coil 6 Valve room 8 Piping 10 Piping 12 Suction element 12 Valve seat 14 Valve element 16 Plunger moving cylinder 18 Plunger 20 Suction element 20a Upper end position 22 Energizing Member 24 Permanent magnet 24a Valve body side end position 26 Coil member 28 Bobbin case 30 Outer box member 30a End 30c Inner end 30b Pressing opening 32 Disk member 34 Lead wire 36 Fastening member 200 Latch-type solenoid valve 201 High pressure Conduit 202 Valve body 203 Low-pressure conduit 205 Conduit 206 Valve chamber 214 Valve body 218 Plunger 219 Operating shaft 220 Attractor 224 Permanent magnet 224a Valve body side end position 300 Four-way switching valve 302 Switching valve body 304 High-pressure pipe 306 Low-pressure pipe 308 Pipe 310 Piping 312 Valve room 314 Pis Ton 318 Piston shaft 320 Valve body 322 Switching valve 324 Cylinder chamber 326 Cylinder chamber 330 Refrigerant circuit 332 Compressor 334 Accumulator 336 Capillary 338 Indoor heat exchanger 340 Outdoor heat exchanger

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F25B 41/04 F25B 41/04 C (72) Inventor Mikio Matsushima 535 Sasai, Sayama City, Saitama Prefecture Sagimiya Co., Ltd. (72) Inventor Koichi Fujisaki 535 Sasai, Sayama City, Saitama Prefecture Sagimiya Manufacturing Co., Ltd. Sayama Plant DD32 FF11 GG23 GG24 3H106 DA07 DA13 DA23 DA27 DA35 DB02 DB12 DB22 DB32 DC04 DC08 DC17 DC19 DD03 EE20 EE22 EE34 EE48 GA13 KK23

Claims (15)

[Claims] 1. A valve body comprising: a valve seat; a valve body that opens and closes a fluid passage by moving in a direction of being seated and separated from the valve seat; and the valve body being connected to the valve body, An electromagnetic actuation coil for controlling movement of the plunger, wherein the electromagnetic actuation coil is disposed movably in the axial direction within the plunger movement cylinder having one end connected to the valve body. A plunger having one end connected to the valve element, a suction element fixed to the other end of the plunger moving cylinder so as to face the other end of the plunger, and a direction in which the plunger is separated from the suction element. A biasing member interposed between the plunger and the suction element so as to bias the plunger; a coil member disposed on an outer periphery of the plunger moving cylinder on the valve body side; On the outer circumference of the moving cylinder, Serial and a permanent magnet disposed in the suction slave, the permanent magnets, while being axially magnetized in opposite polarities,
The plunger is arranged so as to generate a magnetic pole that causes the plunger to be attracted to a suction element, and by energizing the coil member so that the coil member generates a magnetic flux in the same direction as the magnetic flux of the permanent magnet. Is attracted to the attraction element, and the path of the fluid is opened by moving the valve body away from the valve seat, so that the coil member generates a magnetic flux in the opposite direction to the magnetic flux of the permanent magnet. By energizing the coil member, the force of the urging member causes the plunger to move away from the suction element, and moves in a direction in which the valve element is seated against the valve seat, thereby forming a fluid passage. A latch-type solenoid valve configured to be closed. 2. The latch-type electromagnetic device according to claim 1, further comprising an outer box member that forms a part of a magnetic path of a magnetic flux of the coil member and the permanent magnet, and accommodates a coil of the coil member. valve. 3. A lower end position of an inner wall on a permanent magnet side of an outer box member accommodating the coil member, the upper end position of the attracting member being:
The latch type solenoid valve according to claim 2, wherein the latch type solenoid valve is set so as to be located between the positions of the upper end surface of the plunger at the separated position. 4. The lower end position of the inner wall of the outer case member that houses the coil member on the permanent magnet side is defined by the lower end position of the attraction element.
The latch-type solenoid valve according to claim 3, wherein the solenoid valve is set to be located between the positions of the upper end surface of the plunger at the separated position. 5. An opening for pressing a coil from below toward a permanent magnet side when the coil member is arranged, is formed at an end of the outer box member on the valve body side. The latch type solenoid valve according to any one of claims 2 to 4, wherein: 6. A high pressure conduit, a low pressure conduit, and a pair of conduits, such that the high pressure conduit is connected to one of the pair of conduits and the low pressure conduit is connected to the other conduit. With a latch-type solenoid valve configured to be selectively switchable, a high-pressure pipe connected to a high-pressure pipe of the solenoid valve, a low-pressure pipe connected to a low-pressure pipe of the solenoid valve, and a pair of pipes, A valve chamber to be connected, a pair of pistons at both ends, and a switching valve slidable in the axial direction in the valve chamber, comprising a valve element connected to the piston shaft; and the valve chamber by the piston. A switching valve body having a pair of cylinder chambers formed at both ends of the solenoid valve, respectively, and a pair of conduits of the solenoid valve are connected to a pair of cylinder chambers of the switching valve body, respectively. According to the switching of the valve, Due to the pressure difference in the cylinder chamber of the switching valve body, the switching valve is selectively slid in the axial direction to connect the high-pressure pipe to one of the pair of pipes and connect the low-pressure pipe to the other pipe. A four-way switching valve configured to be selectively switchable so as to be connected to a pipe, wherein the latch-type solenoid valve moves in the axial direction to move the high-pressure conduit to one of a pair of conduits. A valve body having a valve body configured to be selectively switchable so as to connect to the conduit and to connect the low-pressure conduit to the other conduit; and a valve body connected to the valve body to move the valve body. An electromagnetic operating coil to be controlled, wherein the electromagnetic operating coil is disposed in the plunger moving cylinder, one end of which is connected to the valve main body; Body and one end connected A plunger, a suction element fixed to the other end of the plunger moving cylinder so as to face the other end of the plunger, and a plunger for urging the plunger in a direction away from the suction element. An urging member interposed between the plunger moving cylinder and the plunger moving cylinder; and a coil member disposed on the valve body side on an outer periphery of the plunger moving cylinder. And a permanent magnet disposed on the attraction element side, wherein the permanent magnet is magnetized in a different direction in the axial direction,
The plunger is arranged so as to generate a magnetic pole that causes the plunger to be attracted to a suction element, and by energizing the coil member so that the coil member generates a magnetic flux in the same direction as the magnetic flux of the permanent magnet. And a first operating state in which the coil member generates a magnetic flux in a direction opposite to the magnetic flux of the permanent magnet, by energizing the coil member, and by the force of the urging member, A four-way switching valve configured to be switchable between a second operating state in which the plunger is separated from the suction element. 7. The four-way switching valve according to claim 6, further comprising an outer box member that forms a part of a magnetic path of a magnetic flux of the permanent magnet and the coil member, and that accommodates a coil of the coil member. . 8. A lower end position of an inner wall on a permanent magnet side of an outer box member accommodating the coil member, the upper end position of an attraction element being:
The four-way switching valve according to claim 7, wherein the four-way switching valve is set so as to be located between the positions of the upper end surface of the plunger at the separated position. 9. A lower end position of an inner wall on a permanent magnet side of an outer box member accommodating the coil member, the lower end position of a suction element being:
The four-way switching valve according to claim 8, wherein the valve is set so as to be located between the positions of the upper end surface of the plunger at the separated position. 10. The end of the outer box member on the valve body side,
The four-way switching valve according to any one of claims 7 to 9, wherein when the coil member is arranged, a pressing opening hole for pressing the coil from below toward the permanent magnet is formed. 11. A plunger moving cylinder, a plunger disposed axially movably in the plunger moving cylinder, and a plunger moving cylinder facing the other end of the plunger. An opening for accommodating a suction element fixed to the other end and a biasing member interposed between the plunger and the suction element so as to bias the plunger in a direction away from the suction element; A coil member disposed on the outer side of the opening on the side away from the attraction element; and a permanent magnet disposed on the outer side of the opening on the side of the attraction element. The magnet is magnetized in the opposite direction in the axial direction,
The plunger is arranged so as to generate a magnetic pole that causes the plunger to be attracted to a suction element, and by energizing the coil member so that the coil member generates a magnetic flux in the same direction as the magnetic flux of the permanent magnet. A first operating state in which the magnetic force is applied to the attraction element, and by energizing the coil member so that the coil member generates a magnetic flux in a direction opposite to the magnetic flux of the permanent magnet, A latch type electromagnetic coil configured to be switchable between a second operating state in which the plunger is separated from the suction element. 12. The latch-type electromagnetic device according to claim 11, further comprising an outer box member that forms a part of a magnetic path of the magnetic flux of the permanent magnet and the coil member, and that accommodates a coil of the coil member. coil. 13. The lower end position of the inner wall of the outer case member that houses the coil member on the permanent magnet side is set to be between the upper end position of the suction element and the position of the upper end surface of the plunger at the separated position. The latch-type electromagnetic coil according to claim 12, wherein: 14. A lower end position of an inner wall on a permanent magnet side of an outer box member accommodating the coil member is set so as to be located between a lower end position of the attraction element and a position of an upper end surface of the plunger at a separated position. The latch-type electromagnetic coil according to claim 13, wherein: 15. An opening for pressing a coil from below toward a permanent magnet side when the coil member is disposed, is formed at an end of the outer box member on the plunger side. The latch type electromagnetic coil according to any one of claims 12 to 14, wherein: