Solenoid valve

Abstract

The utility model relates to an electromagnetic valve, which enables a box type electromagnetic valve to be miniaturized. The solenoid valve can be inserted into the flow path block, and is provided with: a valve body in which a first flow path communicating with an inlet of the flow path block and a second flow path communicating with an outlet are formed, and a main valve chamber having a main valve seat is provided between the first flow path and the second flow path; a suction member; a plunger sucked by the suction member; a main valve body which is provided in the main valve chamber, moves in the axial direction, and comes into contact with or separates from the main valve seat; a holder provided on the opposite side from the main valve seat in the axial through-hole, and provided with a sub-valve chamber communicating with the main valve chamber and having a sub-valve seat; and a sub-valve body provided in the sub-valve chamber, the sub-valve body being brought into contact with or separated from the sub-valve seat by the opening and closing of the plunger to the port, and a relief flow path provided on the outside of the valve body in the radial direction of the main valve body, the relief flow path causing the pressure of the sub-valve chamber to flow to the outlet port.

Description

Technical Field

[0001] The utility model relates to a solenoid valve. Background Art

[0002] There is disclosed a two-stage pilot-operated solenoid valve in which a pilot-operated first valve element and a pilot-operated second valve element for operating the first valve element are provided in a main body member having an inlet and an outlet (see Patent Document 1).

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2015-224649.

[0006] Technical issues to be solved by utility models

[0007] In the above-mentioned conventional examples, the solenoid valve is a so-called block type in which a valve core is incorporated into a main body having an inlet and an outlet, and the overall design is changed according to the specification. On the other hand, there is also a cassette type solenoid valve which is prepared separately from the main body and mounted on a main body of any specification.

[0008] However, a long hole (first pilot main passage) is formed along the axial direction of the first valve body located in the second stage, and if the solenoid valve is simply changed from a block type to a cassette type, it is considered that the solenoid valve will be increased in size by the amount of the long hole. Utility Model Content

[0009] The utility model aims to miniaturize a box-type electromagnetic valve.

[0010] Technical means to solve problems

[0011] The solenoid valve involved in the first embodiment is a cassette-type solenoid valve installed in a flow path block having an inlet and an outlet, and comprises: a valve body, the valve body being configured as a cylinder capable of being inserted into the flow path block, a through hole being formed in the axial direction of the valve body, and the valve body being formed with a first flow path connected to the inlet and a second flow path connected to the outlet when the valve body is installed in the flow path block, and a main valve chamber having a main valve seat being provided between the first flow path and the second flow path; an attraction member installed on the axial side of the valve body opposite to the second flow path; a plunger, the plunger being magnetized and attracted by the magnetized attraction member; A pilot-operated main valve core, which is arranged in the main valve chamber and moves along the axial direction to abut or separate from the main valve seat; a retaining frame, which is arranged on the side of the through hole opposite to the main valve seat and is provided with an auxiliary valve chamber, which is connected to the main valve chamber and has an auxiliary valve seat; and a pilot-operated auxiliary valve core, which is arranged in the auxiliary valve chamber and has a port opened and closed by the plunger, and moves in the axial direction to abut or separate from the auxiliary valve seat by opening and closing the port, and a release flow path is provided on the radially outer side of the main valve core in the valve body, and the release flow path allows the pressure of the auxiliary valve chamber to flow to the outflow port when the port is opened.

[0012] The solenoid valve is a dual-pilot solenoid valve having a pilot main valve core and a pilot sub-valve core. As a form, it can be any one of a normally closed type in which the main valve core is closed when the suction member does not attract the plunger, and a normally open type in which the main valve core is opened when the suction member does not attract the plunger. Taking the normally closed type as an example, when the plunger is attracted by the suction member, the port is opened and the pilot sub-valve core leaves the sub-valve seat. The fluid in the sub-valve chamber flows to the outlet through the release flow path. In this way, the pressure on the retainer side of the main valve core in the main valve chamber is lower than the pressure on the first flow path side connected to the inlet, so the main valve core leaves the main valve seat. When the suction member stops attracting the plunger, the port is closed by the plunger, so the sub-valve core abuts against the sub-valve seat due to the increase in pressure in the sub-valve chamber, and the main valve core abuts against the main valve seat due to the increase in pressure in the main valve chamber.

[0013] In this solenoid valve, a relief flow path is provided radially outside the main valve element in the valve body. The relief flow path allows the pressure of the sub-valve chamber to flow to the outlet port when the port is open. Therefore, it is a cartridge-type solenoid valve and can be miniaturized.

[0014] A second aspect is that in the solenoid valve according to the first aspect, a guide member for sliding the main valve element inside is provided on the main valve chamber side of the retainer, and at least a portion of the release flow path is formed between the guide member and an inner surface of the valve body.

[0015] In this solenoid valve, since at least a part of the release flow path is formed between the guide member and the inner surface of the valve body, manufacturing and miniaturization are easier than when the release flow path is bored in the valve body.

[0016] A third method is that, in the solenoid valve involved in the first method or the second method, the retaining frame is provided with: an internal flow path, which is formed from the port toward the main valve chamber side, and then formed toward the radial outside and connected with the release flow path; and a connecting hole, which is formed avoiding the internal flow path to connect the auxiliary valve chamber with the main valve chamber.

[0017] In this solenoid valve, the communicating hole for communicating the sub-valve chamber with the main valve chamber is formed in the retainer away from the internal flow path communicating with the release flow path, thereby suppressing the size of the retainer and further suppressing the size of the solenoid valve.

[0018] According to a fourth aspect, in the solenoid valve according to any one of the first to third aspects, the release flow path opens on a side opposite to the retainer that is forward in an insertion direction of the flow path block in the axial direction of the valve body.

[0019] In this solenoid valve, in the axial direction of the valve body, the release flow path opens on the side opposite to the retaining frame, which is forward of the insertion direction into the flow path block. Therefore, when the cassette-type solenoid valve is installed on the flow path block, the release flow path can be easily connected to the flow outlet of the flow path block located forward of the insertion direction.

[0020] In this solenoid valve, the plunger can be attracted to the attracting member by magnetizing the attracting member and the plunger using the electromagnetic coil.

[0021] A fifth aspect is the solenoid valve according to any one of the first to fourth aspects, further comprising an electromagnetic coil that generates a magnetic field that magnetizes the attracting member.

[0022] According to the utility model, the cassette-type solenoid valve can be miniaturized. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a cross-sectional view showing the solenoid valve according to the present embodiment.

[0024] Figure 2 yes Figure 1 Enlarged cross-sectional view of section A in FIG.

[0025] Figure 3 It is a cross-sectional view showing the valve body.

[0026] Figure 4 Indicates the valve body. Figure 3 The 4-4 section view in the figure.

[0027] Figure 5 (A) is a cross-sectional view showing a state in which the coil is not energized in the solenoid valve, and (B) is a cross-sectional view showing a state in which the plunger is attracted by the attracting member due to the energization of the coil.

[0028] Figure 6 (A) is a cross-sectional view showing a state where the sub-valve element is separated from the sub-valve seat (valve-opened state), and (B) is a cross-sectional view showing a state where the main valve element is separated from the main valve seat (valve-opened state).

[0029] Explanation of symbols

[0030] 10 Solenoid valve

[0031] 12 Flow inlet

[0032] 14 Outlet

[0033] 16 flow path blocks

[0034] 18. Electromagnetic coil

[0035] 20 Attractions

[0036] 21 Valve body

[0037] 21A through hole

[0038] 22 cage

[0039] 22A internal flow path

[0040] 22B connecting hole

[0041] 24 plunger

[0042] 26 Main valve core

[0043] 31First flow path

[0044] 32 Second flow path

[0045] 36 auxiliary valve core

[0046] 36A port

[0047] 40 Main valve chamber

[0048] 42 Main valve seat

[0049] 52 Guide components

[0050] 60 auxiliary valve chamber

[0051] 62 auxiliary valve seat

[0052] 68 Release flow path

[0053] 72 communicating holes. DETAILED DESCRIPTION

[0054] Hereinafter, the method for implementing the present utility model will be described based on the accompanying drawings. The constituent elements represented by the same symbols in each of the accompanying drawings mean the same or identical constituent elements. In addition, the descriptions and symbols repeated in the embodiments described below are sometimes omitted. In addition, the accompanying drawings used in the following description are all schematic drawings, and the relationship between the dimensions of the elements, the ratio of the elements, etc. shown in the accompanying drawings are not necessarily consistent with the actual ones. In addition, the relationship between the dimensions of the elements, the ratio of the elements, etc., may not be consistent between multiple drawings.

[0055] exist Figure 1 , Figure 2 The solenoid valve 10 of the present embodiment is a dual pilot type solenoid valve used in, for example, a refrigeration cycle of an automobile air conditioner. The solenoid valve 10 of the present embodiment is a so-called normally closed type solenoid valve that is in a closed valve state when the solenoid coil 18 is not energized. The solenoid valve 10 is mounted on a flow path block 16 ( Figure 5 , Figure 6 The solenoid valve 10 includes a valve body 21, a suction member 20, a plunger 24, a main valve element 26, a retainer 22, and a sub-valve element 36. The solenoid valve 10 may further include an electromagnetic coil 18 that generates a magnetic field that magnetizes the suction member 20.

[0056] (Valve body)

[0057] The valve body 21 is configured in a cylindrical shape into which the flow path block 16 can be inserted, and a through hole 21A is formed in the axial direction. The valve body 21 is formed with a first flow path 31 and a second flow path 32 .

[0058] like Figure 3 , Figure 4 As shown, the first flow path 31 is to the flow path block 16 ( Figure 5 , Figure 6 ) is installed, and eight, for example, flow paths connected to the inlet 12 are formed evenly in the circumferential direction. This is to allow at least one of the first flow paths 31 to be arranged at the position of the inlet 12 of the flow path block 16 even in the case of a structure in which the solenoid valve 10 is screwed to the flow path block 16, so that the fluid flows from the inlet 12 to the first flow path 31. For example, two O-rings 28 are installed on the outer periphery of the valve body 21. The first flow path 31 is formed between the two O-rings 28 in the axial direction of the valve body 21.

[0059] The second flow path 32 is located at the end of the through hole 21A on the opposite side from the plunger 24 (at the Figure 1 The opening portion (the lower end portion in the figure) is communicated with the outflow port 14 of the flow path block 16 when the solenoid valve 10 is inserted and mounted in the flow path block 16.

[0060] The first flow path 31 and the second flow path 32 are connected to each other. In addition, a main valve chamber 40 having a main valve seat 42 is provided between the first flow path 31 and the second flow path 32 .

[0061] The outer periphery of the valve body 21 is provided with an external thread portion 21B which is threadedly engaged with the flow path block 16. Figure 1 A plurality of recesses 21C are formed along the circumferential direction on the outer periphery of the valve body 21 (at the upper end). The recesses 21C are cutouts, for example, with a generally rectangular cross section, for hooking a tool for rotating the valve body 21 about the axis. Figure 1 An internal thread portion 21D that is threadedly engaged with the retainer 22 is provided on the inner periphery of the retainer 21 (in the middle, the upper end portion).

[0062] (Attractor)

[0063] The suction member 20 is installed on the side of the valve body 21 opposite to the second flow path 32 in the axial direction. Specifically, the suction member 20 is a soft magnetic body such as magnetic stainless steel, for example, and is fitted on one end side of the tube 38 (at Figure 1 The other end of the tube 38 (in Figure 1 The lower end side in the middle is supported by a pipe holder 30 described later.

[0064] (Electromagnetic coil)

[0065] The electromagnetic coil 18 is configured to have a winding and is arranged in a manner sandwiched between the upper plate 48U and the lower plate 48L of the housing 48. In addition, the electromagnetic coil 18 magnetizes the attracting member 20 and the plunger when a current flows through the winding. A tube 38 is inserted through the housing 48 and the electromagnetic coil 18, and the upper plate 48U of the housing 48 is fastened to the attracting member 20 by, for example, screws 44. Thus, the housing 48 and the electromagnetic coil 18 are fixed to the tube 38. The electromagnetic coil 18 is provided with a connector 46 for supplying power.

[0066] (Plunger)

[0067] The plunger 24 is a soft magnetic component that is magnetized by the electromagnetic coil 18 and attracted by the magnetized attracting member 20. Specifically, the plunger 24 is configured to be able to slide in the axial direction in the tube 38. A compression spring 50 is provided between the attracting member 20 and the plunger 24. The compression spring 50 is provided to prevent the plunger 24 from moving toward the auxiliary valve core 36 ( Figure 1 At the end of the plunger 24 on the side of the auxiliary valve core 36 (at the Figure 1 A protrusion having a substantially conical shape, for example, is provided in a manner capable of closing the port 36A of the sub-valve element 36 (in the middle, the lower end portion).

[0068] (Main valve core)

[0069] The main valve core 26 is a pilot-operated valve core, and together with the main valve seat 42, constitutes the main valve 70. The main valve core 26 is provided in the main valve chamber 40, and moves in the axial direction to abut against or separate from the main valve seat 42. Specifically, the main valve core 26 is arranged inside the guide member 52 described later, and is arranged to be able to slide in the axial direction relative to the guide member 52. A piston ring 54 is installed on the side wall of the main valve core 26 to adjust the area of ​​the gap generated between the main valve core 26 and the inner wall of the guide member 52. The main valve core 26 is formed with passages 26A (pressure equalizing holes) leading to one side and the other side in the axial direction.

[0070] A main valve gasket 56 is installed at a portion of the main valve core 26 that faces the main valve seat 42 in the axial direction. In addition, a compression spring 58 is provided between the main valve core 26 and the retainer 22. The compression spring 58 pushes the main valve core 26 toward the main valve seat 42 ( Figure 1 When the main valve gasket 56 is in close contact with the main valve seat 42, the main valve 70 is closed.

[0071] (cage)

[0072] The retainer 22 is provided on the side of the through hole 21A of the valve body 21 opposite to the main valve seat 42. The central axis of the retainer 22 coincides with the central axis of the through hole 21A. An external threaded portion 22D that is screwed with the internal threaded portion 21D of the valve body 21 is provided on the outer periphery of the retainer 22. The retainer 22 is mounted on the valve body 21 by screwing the external threaded portion 21D with the internal threaded portion 22D. In addition, an O-ring 64 is mounted on the outer periphery of the retainer 22 at a position closer to the main valve core 26 than the external threaded portion 22D. The valve body 21 and the retainer 22 are sealed by the O-ring 64.

[0073] One end of the support tube 38 is mounted on the retainer 22 (at Figure 1 The pipe holder 30 is a tubular member that is attached to the holder 22 from the opposite side of the main valve core 26 in the axial direction, for example, by screwing. The central axis of the pipe holder 30 coincides with the central axis of the holder 22 (the central axis of the through hole 21A). In addition, the pipe holder 30 and the holder 22 are sealed by an O-ring 66.

[0074] The holder 22 is provided with an auxiliary valve chamber 60 which communicates with the main valve chamber 40 and has an auxiliary valve seat 62. The auxiliary valve chamber 60 is mainly located inside the tube holder 30. The auxiliary valve element 36 is disposed in the auxiliary valve chamber 60 so as to be slidable in the axial direction.

[0075] A guide member 52 is provided on the main valve chamber 40 side of the retainer 22, and the main valve core 26 slides inside. The guide member 52 is, for example, a cylindrical tube. The end of the guide member 52 on the second flow path 32 side is embedded in the valve body 21 and fixed. The fitting portion between the inner surface of the guide member 52 and the tube support portion 21E of the valve body 21 is sealed by an O-ring 74. The O-ring 74 is held by a retainer 82 riveted to the retainer 22 so as not to move toward the retainer 22 side ( Figure 1 detached from the upper side of the

[0076] The outer diameter of the guide member 52 is smaller than the inner diameter of the valve body 21 at the position where the guide member 52 is arranged, and a release flow path 68 is formed between the guide member 52 and the inner surface of the valve body 21. The release flow path 68 is a flow path for allowing the pressure of the auxiliary valve chamber 60 to flow to the outlet 14 when the port 36A is opened, and is formed between the guide member 52 and the inner surface of the valve body 21, for example, in the entire circumferential direction.

[0077] The retainer 22 is provided with an internal flow path 22A and a connecting hole 22B. The internal flow path 22A has a first partition formed axially from the port 36A of the auxiliary valve core 36 described later toward the main valve chamber 40 side, for example, at the center of the retainer 22, and a second partition formed radially outward and connected to the release flow path 68. In the present embodiment, the internal flow path 22A branches from the center of the retainer 22 to both radial sides and penetrates in the diameter direction. In other words, the internal flow path 22A is formed in a T-shape. In addition, the shape of the internal flow path 22A is not limited to this, and it can also avoid the connecting hole 22B and branch more, and open at the outer periphery of the retainer 22.

[0078] The communication hole 22B is formed to avoid the internal flow path 22A, so that the auxiliary valve chamber 60 communicates with the main valve chamber 40. In order to avoid the internal flow path 22A, the communication hole 22B is not formed in the Figure 1 In the cross section, so Figure 1 The communicating holes 22B are indicated by imaginary lines in FIG. As an example, the communicating holes 22B are located on both sides in the radial direction of a portion of the internal flow path 22A extending in the radial direction.

[0079] In the axial direction of the valve body 21, the release flow path 68 opens on the side opposite to the retainer 22, which is the front side of the insertion direction of the flow path block 16. As an example, a part of the outlet side of the release flow path 68 is provided as a communication hole 72 having a larger diameter than the gap between the guide member 52 and the inner surface of the valve body 21. The communication hole 72 is formed at two locations that are point-symmetrical with respect to the center of the valve body 21, avoiding the first flow path 31. Figure 5 , Figure 6 As shown, when the solenoid valve 10 is mounted on the flow path block 16 , the second flow path 32 and the release flow path 68 are communicated with the flow outlet 14 of the flow path block 16 .

[0080] (Secondary valve core)

[0081] The auxiliary valve core 36 is a pilot valve core provided in the auxiliary valve chamber 60, and constitutes the auxiliary valve 80 together with the auxiliary valve seat 62. The auxiliary valve core 36 has a port 36A opened and closed by the plunger 24, and moves in the axial direction by opening and closing the port 36A, thereby contacting or separating from the auxiliary valve seat 62. The port 36A is connected in the axial direction from the plunger 24 side to the internal flow path 22A of the retainer 22. The auxiliary valve gasket 76 is installed in the portion of the auxiliary valve core 36 that is opposite to the auxiliary valve seat 62 in the axial direction. When the auxiliary valve gasket 76 is in close contact with the auxiliary valve seat 62, the auxiliary valve 80 is closed.

[0082] (effect)

[0083] The present embodiment is constructed as described above, and its operation will be described below. The solenoid valve 10 involved in the present embodiment is a so-called normally closed type solenoid valve. Figure 5 , Figure 6 When the electromagnetic coil 18 is energized to magnetize the attracting member 20 and the plunger 24, the plunger 24 is attracted by the attracting member 20. Then, the plunger 24 overcomes the force of the compression spring 50 and moves toward the attracting member 20, and the port 36A of the auxiliary valve core 36 is opened ( Figure 5 As a result, the fluid in the auxiliary valve chamber 60 escapes to the outlet 14 through the port 36A of the retainer 22, the internal flow path 22A, and the release flow path 68, so that the plunger 24 side of the auxiliary valve core 36 in the auxiliary valve chamber 60 ( Figure 5 The pressure on the upper side of (B) is higher than that on the communicating hole 22B side ( Figure 5 As a result, the pilot-operated auxiliary valve core 36 is pulled away from the auxiliary valve seat 62 ( Figure 2 ) leaves, and the auxiliary valve 80 opens ( Figure 6 (A)).

[0084] When the auxiliary valve 80 is opened, the fluid on the retainer 22 side of the main valve core 26 in the main valve chamber 40 escapes to the outlet 14 through the communication hole 22B, the internal flow path 22A and the release flow path 68. As a result, the pressure on the retainer 22 side of the main valve core 26 in the main valve chamber 40 is lower than the pressure on the first flow path 31 side communicating with the inlet 12. As a result, the main valve core 26 is released from the main valve seat 42 ( Figure 1 , Figure 2 ) leaves, the main valve 70 opens ( Figure 6 (B)).

[0085] When the electromagnetic coil 18 is stopped from being energized and the attraction of the plunger 24 by the attraction member 20 stops, the plunger 24 moves due to the force of the compression spring 50, thereby closing the port 36A, and therefore, the pressure in the auxiliary valve chamber 60 increases and is equalized, and the auxiliary valve core 36 abuts against the auxiliary valve seat 62, and the auxiliary valve 80 is closed. In addition, due to the force of the compression spring 58 and the increase and equalization of the pressure in the main valve chamber 40, the main valve core 26 abuts against the main valve seat 42, and the main valve 70 is closed.

[0086] In this embodiment, since the release flow path 68 that allows the pressure of the auxiliary valve chamber 60 to flow to the outflow port 14 when the port 36A is opened is provided on the radially outer side of the main valve core 26 in the valve body 21, it is a cassette-type solenoid valve and can be miniaturized. Since at least a part of the release flow path 68 is formed between the guide member 52 and the inner surface of the valve body 21, it is easier to manufacture and miniaturize than in the case where the release flow path 68 is bored in the valve body 21.

[0087] In the retainer 22 , the communication hole 22B for communicating the sub-valve chamber 60 with the main valve chamber 40 is formed away from the internal flow path 22A communicating with the release flow path 68 , so that the size of the retainer 22 and, in turn, the size of the solenoid valve 10 can be suppressed.

[0088] Moreover, since the release flow path 68 opens on the side opposite to the retaining frame 22, which is forward of the insertion direction of the flow path block 16, in the axial direction of the valve body 21, when the cassette-type solenoid valve is installed on the flow path block 16, the release flow path 68 can be easily connected to the flow outlet 14 of the flow path block 16 located forward of the insertion direction.

[0089] As described above, according to the present embodiment, the cassette-type solenoid valve 10 can be miniaturized.

[0090] [Other embodiments]

[0091] As mentioned above, although an example of embodiment of the present invention was described, the embodiment of the present invention is not limited to the above, and it is needless to say that various modifications other than the above can be made and implemented within the scope not departing from the gist thereof.

[0092] The solenoid valve 10 according to the present embodiment is assumed to be a normally closed type in which the main valve element 26 is closed when the attractor 20 does not attract the plunger 24 , but may be a normally open type in which the main valve element 26 is opened when the attractor 20 does not attract the plunger 24 .

[0093] Although it is assumed that a guide member 52 for the main valve core 26 to slide inside is provided on the main valve chamber 40 side of the retainer 22, a structure in which the main valve core 26 slides on the inner surface of the valve body 21 without providing the guide member 52 may be adopted. The release flow path 68 is formed in the axial direction within the range of the wall thickness of the valve body 21. In this case, the release flow path 68 can be formed by, for example, extending the communication hole 72 to the opening position of the internal flow path 22A.

Claims

1. A solenoid valve, which is a cassette-type solenoid valve mounted on a flow path block having an inlet and an outlet, characterized in that: have: a valve body, the valve body being configured in a cylindrical shape capable of being inserted into the flow path block, the valve body being provided with a through hole in the axial direction thereof, the valve body being provided with a first flow path communicating with the inlet port and a second flow path communicating with the outlet port when the valve body is mounted on the flow path block, and a main valve chamber having a main valve seat being provided between the first flow path and the second flow path; a suction member installed on a side of the valve body opposite to the second flow path in the axial direction; a plunger which is magnetized and attracted by the magnetized attracting member; A pilot-operated main valve core, which is disposed in the main valve chamber and moves along the axial direction to abut against or separate from the main valve seat; a retainer, the retainer being arranged on a side of the through hole opposite to the main valve seat and being provided with an auxiliary valve chamber, the auxiliary valve chamber being communicated with the main valve chamber and having an auxiliary valve seat; as well as A pilot-operated auxiliary valve core is provided in the auxiliary valve chamber and has a port opened and closed by the plunger. The auxiliary valve core moves in the axial direction and contacts or separates from the auxiliary valve seat by opening and closing the port. A relief flow path is provided on the radially outer side of the main valve element in the valve body, and allows the pressure of the sub-valve chamber to flow toward the outflow port when the port is opened.

2. The solenoid valve according to claim 1, characterized in that: A guide member for the main valve core to slide inside is provided on the main valve chamber side of the retainer. At least a portion of the release flow path is formed between the guide member and an inner surface of the valve body.

3. The solenoid valve according to claim 1, characterized in that: The retaining frame is provided with: an internal flow path formed from the port toward the main valve chamber side and further formed toward the radially outer side and communicating with the release flow path; and A communication hole is formed to avoid the internal flow path and allows the sub-valve chamber to communicate with the main valve chamber.

4. The solenoid valve according to claim 1, characterized in that: The release flow path opens on a side opposite to the retainer, which is forward in an insertion direction of the flow path block, in the axial direction of the valve body.

5. The solenoid valve according to any one of claims 1 to 4, characterized in that: The device further includes an electromagnetic coil that generates a magnetic field for magnetizing the attracting element.

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