Solenoid valve

Abstract

To ensure a large flow rate when a valve is opened even if the attraction force of an attractor with respect to a plunger is small.SOLUTION: A solenoid valve 10 has: a valve body 22 in which a first flow passage 51 and a second flow passage 52 are formed, and in which a main valve chamber 40 with a main valve seat 42 is provided between the first flow passage 51 and the second flow passage 52; an attractor 24 attached on the axially opposite side of the main valve chamber 40 from the second flow passage 52; a main valve element 26 that is provided in the main valve chamber 40 and moves axially to abut against or separate from the main valve seat 42; a first plunger 31 attracted by the magnetized attractor 24; a second plunger 32 that is attracted by the magnetized first plunger 31 and operates the main valve element 26; and a kick portion 34 that is provided on the first plunger 31 and applies impact to the second plunger 32 in a direction away from the main valve element 26 when the first plunger 31 is attracted by the attractor 24.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a solenoid valve. [Background technology]

[0002] In a solenoid valve that performs a kick action, a pilot type solenoid valve has been disclosed in which a pilot valve body is separated from a pilot port by the kick action of a plunger when the plunger is attracted by an attractor (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-137094 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a normally closed solenoid valve, where the valve closes when the attractor does not attract the plunger, the larger the valve diameter, the larger the required opening area becomes, and the larger the lift amount of the main valve body and the plunger becomes. In addition, the load due to the differential pressure acting on the plunger when the valve is closed also becomes large, so it is necessary to increase the suction force of the attractor in order to lift the plunger when the valve is opened.

[0005] However, if the lift amount of the plunger is large, the gap between the suction element and the plunger becomes large, which creates a tradeoff in that the suction force of the suction element on the plunger becomes smaller.

[0006] An object of the present invention is to ensure a large flow rate when the valve is opened even if the suction force of the suction element relative to the plunger is small. [Means for solving the problem]

[0007] The solenoid valve according to the first aspect includes a valve body in which a first flow path and a second flow path are formed, and in which a main valve chamber having a main valve seat is provided between the first flow path and the second flow path; an attractor attached to the main valve chamber on the opposite side to the second flow path in the axial direction; a main valve body provided in the main valve chamber and moving in the axial direction to abut against or move away from the main valve seat; a magnetized first plunger attracted by the attractor; a second plunger attracted by the magnetized first plunger and operating the main valve body; and a kick portion provided on the first plunger that applies an impact to the second plunger in a direction away from the main valve body when the first plunger is attracted by the attractor.

[0008] In this solenoid valve, the first plunger is attracted to the magnetized attractor and lifts. The attractive force acting on the first plunger increases as the first plunger approaches the attractor. When the first plunger lifts, a kick portion on the first plunger applies an impact to the second plunger in a direction away from the main valve body. This impact force and the attraction of the magnetized first plunger lift the second plunger. This causes the main valve body to move away from the main valve seat and open the valve.

[0009] Because the plunger is divided into a first plunger and a second plunger, the differential pressure load when the valve is closed acts on the second plunger, not on the first plunger. Therefore, to ensure a large flow rate when the valve is open, the lift amount of the first plunger is large, and even if the suction force acting on the first plunger from the suction element is small, the first plunger can be easily lifted.

[0010] In a second aspect, in the solenoid valve according to the first aspect, a pilot valve chamber is provided between the main valve body and the second plunger, a pilot valve seat and a pilot port that communicates the pilot valve chamber and the second flow path are provided in a portion of the main valve body facing the pilot valve chamber, a compression spring is provided between the first plunger and the second plunger for urging the second plunger toward the pilot valve chamber, and the second plunger opens and closes the pilot port by abutting against or moving away from the pilot valve seat.

[0011] In this solenoid valve, the main valve element has a pilot port and a pilot valve seat, and the second plunger opens and closes the pilot port by abutting against or separating from the pilot valve seat to operate the main valve element. Specifically, the first plunger is attracted by the magnetized attractor, and the attraction of the first plunger and the impact input from the kick portion cause the second plunger to move away from the pilot valve seat against the biasing force of the compression spring provided between the first and second plungers. At this time, the pressure in the pilot valve chamber decreases by escaping to the second flow path through the pilot port, and the pressure in the main valve chamber becomes higher than that in the pilot valve chamber. This causes the main valve element to move away from the main valve seat and open the valve.

[0012] When the suction of the first plunger by the suction element stops, the suction of the second plunger by the first plunger also stops, and the second plunger abuts against the pilot valve seat due to the biasing force of the compression spring. This blocks the pilot port, increasing the pressure in the pilot valve chamber and causing the main valve body to abut against the main valve seat and close the valve.

[0013] In a third aspect, in the solenoid valve according to the first or second aspect, the kick portion surrounds the second plunger and is formed so that its axial tip abuts the main valve body when the valve is opened, and the kick portion is provided with a communication portion that communicates with the inside and outside of the kick portion in the pilot valve chamber.

[0014] In this solenoid valve, when the valve is opened, the main valve body abuts against the tip of the kick part, restricting further movement of the main valve body. In other words, the tip of the kick part can set an upper limit for the opening of the main valve body. In addition, since a communication part is provided in the kick part that surrounds the second plunger, even if the main valve body abuts against the tip of the kick part, communication between the inside and outside of the kick part in the pilot valve chamber is maintained. In other words, since the pilot port is maintained in an open state, the increase in pressure in the pilot valve chamber is suppressed, and the open state is maintained.

[0015] A fourth aspect is the solenoid valve according to any one of the first to third aspects, further comprising an electromagnetic coil that generates a magnetic field that magnetizes the attractor.

[0016] In a fifth aspect, in the solenoid valve according to any one of the first to fourth aspects, the solenoid valve is of a cartridge type that is attached to a flow path block having an inlet and an outlet, and when attached to the flow path block, the first flow path communicates with the inlet, and the second flow path communicates with the outlet.

[0017] This solenoid valve is of a cartridge type that can be attached to any flow path block for use, and is therefore highly versatile. Effect of the Invention

[0018] According to the present invention, even if the suction force of the suction element with respect to the plunger is small, a large flow rate can be ensured when the valve is opened. [Brief description of the drawings]

[0019] [Figure 1] 1 is a cross-sectional view showing a solenoid valve according to a first embodiment. [Diagram 2] FIG. 4 is an enlarged cross-sectional view showing a solenoid valve in a closed state. [Diagram 3] FIG. 11 is a cross-sectional view showing a state in which the second plunger is separated from the pilot valve seat. [Figure 4] FIG. 4 is a cross-sectional view showing an open state in which the main valve body is separated from the main valve seat. [Diagram 5] FIG. 11 is an enlarged cross-sectional view showing a solenoid valve according to a second embodiment in a closed state. [Figure 6] 11 is a cross-sectional view showing a state in which the first plunger is attracted by the attractor and the kick portion abuts against a lower portion of the second plunger. FIG. [Figure 7] FIG. 11 is a cross-sectional view showing a state in which the second plunger is separated from the pilot valve seat. [Figure 8] FIG. 4 is a cross-sectional view showing an open state in which the main valve body is separated from the main valve seat. [Figure 9]1 is a cross-sectional view showing an example in which the characteristic configuration of the present invention is applied to a direct-acting solenoid valve; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Components indicated by the same reference numerals in each drawing are the same or similar components. Note that duplicated descriptions and reference numerals in the embodiments described below may be omitted. In addition, all drawings used in the following description are schematic, and the dimensional relationship of each element, the ratio of each element, etc. shown in the drawings do not necessarily match the actual ones. In addition, the dimensional relationship of each element, the ratio of each element, etc. between multiple drawings do not necessarily match.

[0021] [First embodiment] 1 and 2, the solenoid valve 10 according to the present embodiment is a pilot kick solenoid valve used, for example, in the refrigeration cycle of an automobile air conditioner. The solenoid valve 10 according to the present embodiment is a so-called normally closed solenoid valve that is closed when the solenoid coil 18 is not energized. The solenoid valve 10 is a cartridge type solenoid valve that is attached to a flow path block 16 having an inlet 12 and an outlet 14. The solenoid valve 10 has a valve body 22, an attractor 24, a main valve body 26, a first plunger 31, a second plunger 32, and a kick portion 34. The solenoid valve 10 may further include an electromagnetic coil 18 that generates a magnetic field that magnetizes the attractor 24.

[0022] (Valve body) The valve body 22 is configured in a cylindrical shape that can be inserted into the flow path block 16, and has a through hole 22A formed in the axial direction. A first flow path 51 and a second flow path 52 are formed in the valve body 22. The second flow path 52 corresponds to one end of the through hole 22A (the lower end in FIG. 1). The first flow path 51 opens to the outer periphery of the valve body 22 and communicates with the through hole 22A. That is, the first flow path 51 and the second flow path 52 communicate with each other. In the valve body 22, a main valve chamber 40 having a main valve seat 42 is provided between the first flow path 51 and the second flow path 52.

[0023] The first flow passages 51 are flow passages that communicate with the inlet 12 in a state where the solenoid valve 10 is attached to the flow passage block 16, and are formed at, for example, four locations evenly spaced in the circumferential direction. This is because, even in the case where the solenoid valve 10 is configured to be screwed into the flow passage block 16, at least one of the first flow passages 51 is disposed at the position of the inlet 12 of the flow passage block 16 so that the fluid flows from the inlet 12 into the first flow passages 51. For example, two O-rings 28 are attached to the outer periphery of the valve body 22. The first flow passage 51 is formed between the two O-rings 28 in the axial direction of the valve body 22.

[0024] The second flow path 52 is an opening located at the end (the lower end in FIG. 1) of the through hole 22A opposite the plungers (the first plunger 31 and the second plunger 32), and is configured to communicate with the outlet 14 of the flow path block 16 when the solenoid valve 10 is inserted and attached to the flow path block 16.

[0025] The valve body 22 has an outer periphery provided with a male thread portion 22B that screws into the flow path block 16. The valve body 22 has an inner periphery at its end portion (upper end portion in FIG. 1) on the plunger (first plunger 31 and second plunger 32) side, on which a female thread portion 22D screws into a pipe holder 30 (described later).

[0026] (Attractor) The attractor 24 is attached to the side opposite the second flow passage 52 in the axial direction of the main valve chamber 40 (the axial direction of the valve body 22). Specifically, the attractor 24 is a soft magnetic material such as magnetic stainless steel, and is fitted, for example, to one end side (the upper end side in FIG. 1 ) of the pipe 38. The other end side (the lower end side in FIG. 1 ) of the pipe 38 is supported by the pipe holder 30.

[0027] (Pipe holder)

[0028] The pipe holder 30 is a member that supports the pipe 38, and is provided on the opposite side of the through hole 22A of the valve body 22 from the main valve seat 42. The central axis of the pipe holder 30 coincides with the central axis of the through hole 22A. The pipe holder 30 has an outer periphery provided with a male threaded portion 30D that screws into the female threaded portion 22D of the valve body 22. The pipe holder 30 is attached to the valve body 22 by screwing the male threaded portion 22D into the female threaded portion 30D. In addition, an O-ring 64 is attached between the pipe holder 30 and the valve body 22. The O-ring 64 seals the gap between the pipe holder 30 and the valve body 22.

[0029] Between the main valve element 26 and the second plunger 32, for example in a portion surrounded by the valve body 22, the pipe holder 30, and the main valve element 26, there is provided a pilot valve chamber 60 which communicates with the main valve chamber 40 and has a pilot valve seat 62. In the pilot valve chamber 60, the second plunger 32 is arranged so as to be axially movable.

[0030] (electromagnetic coil) The electromagnetic coil 18 is configured with a winding, and is disposed so as to be sandwiched between an upper plate 48U and a lower plate 48L of the housing 48. Furthermore, the electromagnetic coil 18 magnetizes the attractor 24, the first plunger 31, the second plunger 32, etc., when a current flows through the winding. A pipe 38 passes through the housing 48 and the electromagnetic coil 18, and the upper plate 48U of the housing 48 is fastened to the attractor 24 by, for example, a screw 44. In this way, the housing 48 and the electromagnetic coil 18 are fixed to the pipe 38. The electromagnetic coil 18 is provided with a connector 46 for supplying power.

[0031] (Main valve body) The main valve element 26 is a pilot type valve element, and constitutes a valve 70 together with the main valve seat 42. The main valve element 26 is provided in the main valve chamber 40, and moves axially to abut against or separate from the main valve seat 42. Specifically, the main valve element 26 is disposed inside the valve body 22, and is disposed so as to be axially slidable relative to the inner wall of the valve body 22. A piston ring 54 is attached to the side wall of the main valve element 26, and adjusts the area of ​​the gap between the main valve element 26 and the inner wall of the valve body 22. The main valve element 26 is formed with a passage 26A (pressure equalizing hole) that communicates with one side and the other side in the axial direction. The passage 26A communicates between the pilot valve chamber 60 and the main valve chamber 40.

[0032] A pilot valve seat 62 and a pilot port 26B are provided in a portion of the main valve body 26 facing the pilot valve chamber 60. The pilot port 26B communicates the pilot valve chamber 60 and the second flow passage 52 on the radially inner side of the pilot valve seat 62.

[0033] A valve packing 56 is attached to the portion of the main valve element 26 that axially faces the main valve seat 42. When the valve packing 56 comes into close contact with the main valve seat 42, the valve 70 is closed. In addition, a compression spring 58 is provided between the main valve element 26 and the valve body 22 (below the main valve element 26 in FIG. 1). The compression spring 58 biases the main valve element 26 in a direction away from the main valve seat 42 (upward in FIG. 1), making it easier for the main valve element 26 to move when the valve is opened.

[0034] (First plunger) The first plunger 31 is a soft magnetic member that is attracted to the magnetized attractor 24. Specifically, the first plunger 31 is arranged in the pipe 38 so as to be axially slidable. A compression spring 50 is provided between the attractor 24 and the first plunger 31. The compression spring 50 biases the first plunger 31 toward the second plunger 32 (the lower side in FIG. 1). The first plunger 31 and the attractor 24 each have, for example, tapered surfaces that face each other in order to increase the initial attractive force.

[0035] (Second plunger) The second plunger 32 is a soft magnetic member that is attracted to the magnetized first plunger 31 and operates the main valve body 26. The second plunger 32 opens and closes the pilot port 26B by coming into contact with or moving away from a pilot valve seat 62. In other words, the second plunger 32 and the pilot valve seat 62 form a pilot valve 80.

[0036] A pilot valve packing 36 is attached to the end (the lower end in FIG. 1) of the second plunger 32 on the main valve body 26 side. When the pilot valve packing 36 comes into close contact with the pilot valve seat 62, the pilot valve 80 is closed.

[0037] The first plunger 31 and the second plunger 32 have, for example, tapered surfaces facing each other in order to increase the initial attraction force. A compression spring 66 is provided between the first plunger 31 and the second plunger 32. The compression spring 66 biases the second plunger 32 in a direction away from the first plunger 31 (toward the lower side in FIG. 1).

[0038] (Kick section) The kick portion 34 is provided on the first plunger 31, and is a portion that applies an impact to the second plunger 32 in a direction away from the main valve body 26 when the first plunger 31 is attracted by the attractor 24. The kick portion 34 has, for example, a cylindrical portion 34A that surrounds the periphery of the second plunger 32, and a hook portion 34B. One end of the cylindrical portion 34A in the axial direction (the upper end in FIG. 1) is fixed to the first plunger 31. The inner diameter of the cylindrical portion 34A is slightly larger than the outer diameter of the second plunger 32. This allows the second plunger 32 to move axially inside the cylindrical portion 34A.

[0039] The hook portion 34B is provided at the other end (lower end in FIG. 1) of the cylindrical portion 34A and is a portion that protrudes radially inward. The hook portion 34B is formed, for example, in an annular shape, and the main valve body 26 side and the second plunger 32 side are in communication with each other. The inner diameter of the hook portion 34B is larger than the outer diameter of the pilot valve seat 62 and smaller than the inner diameter of the cylindrical portion 34A. This allows the second plunger 32 to abut against the pilot valve seat 62 when the valve is closed. In addition, when the first plunger 31 is attracted by the attractor 24, the hook-shaped lower end 34A of the kick portion 34 catches the second plunger 32, and the second plunger 32 can apply an impact to the first plunger 31.

[0040] In FIG. 2, the maximum axial movement of the first plunger 31 between the valve closing time and the valve opening time is defined as a lift amount L1, and the maximum axial movement of the main valve body 26 is defined as a lift amount L2. The lift amount L1 corresponds to the minimum axial gap between the suction element 24 and the first plunger 31. The lift amount L2 corresponds to the minimum axial gap between the main valve body 26 and the pipe holder 30. In this embodiment, L1>L2. That is, even if the kick portion 34 abuts against the main valve body 26 when the valve is closed as shown in FIG. 1 and FIG. 2, the main valve body 26 abuts against the pipe holder 30 when the valve is opened as shown in FIG. 4, and does not lift to the position where it abuts against the kick portion 34.

[0041] (action) The present embodiment is configured as described above, and its operation will be described below. The solenoid valve 10 according to the present embodiment is a so-called normally closed solenoid valve. As shown in FIG. 3, when the solenoid coil 18 is energized to magnetize the attractor 24, the first plunger 31 is attracted to the magnetized attractor 24 and lifted. At this time, the first plunger 31 lifts against the biasing force of the compression spring 50. The attractive force acting on the first plunger 31 increases as the first plunger 31 approaches the attractor 24. When the first plunger 31 lifts, the kick portion 34 provided on the first plunger 31 applies an impact to the second plunger 32 in a direction away from the main valve body 26. Due to this impact force and the attraction of the magnetized first plunger 31, the second plunger 32 lifts against the biasing force of the compression spring 66 and moves away from the pilot valve seat 62.

[0042] Because the plunger is divided into the first plunger 31 and the second plunger 32, the differential pressure load when the valve is closed acts on the second plunger 32, but not on the first plunger 31. Therefore, the lift amount of the first plunger 31 is large to ensure a large flow rate when the valve is open, and even if the suction force acting from the suction element 24 to the first plunger 31 is small, the first plunger 31 can be easily lifted.

[0043] In this embodiment, the main valve body 26 has a pilot port 26B and a pilot valve seat 62, and the second plunger 32 abuts against or separates from the pilot valve seat 62 to open or close the pilot port 26B, thereby operating the main valve body 26. Specifically, the first plunger 31 is attracted by the magnetized attractor 24, and the second plunger 32 is separated from the pilot valve seat 62 against the biasing force of the compression spring 66 provided between the first plunger 31 and the second plunger 32 by the attraction of the first plunger 31 and the impact input from the kick portion 34. At this time, the pressure in the pilot valve chamber 60 is lowered by escaping to the second flow path 52 through the pilot port 26B, and the pressure in the main valve chamber 40 becomes higher than that of the pilot valve chamber 60. As a result, the main valve body 26 is separated from the main valve seat 42 and opens. At this time, the biasing force of the compression spring 58 promotes the lift of the main valve body 26.

[0044] 2, since the lift amounts L1 and L2 are such that L1>L2, the lift amount of the main valve body 26 reaches the lift amount L2 when it abuts against the pipe holder 30. In other words, the main valve body 26 does not lift to the position where it abuts against the kick portion 34, and there is a gap between the main valve body 26 and the kick portion 34. In addition, since the second plunger 32 is lifted by being attracted to the first plunger 31, the second plunger 32 moves away from the pilot valve seat 62, and the pilot port 26B is maintained in an open state. As a result, the fluid that has flowed from the main valve chamber 40 into the pilot valve chamber 60 flows from the pilot port 26B to the second flow path 52, so that the increase in pressure in the pilot valve chamber 60 is suppressed, and the open state is maintained.

[0045] When the supply of current to the electromagnetic coil 18 is stopped and the attraction of the first plunger 31 by the attractor 24 stops, the first plunger 31 moves away from the attractor 24 due to the biasing force of the compression spring 50. The attraction of the second plunger 32 by the first plunger 31 also stops, and the second plunger 32 comes into contact with the main valve seat 42 due to the biasing force of the compression spring 66. This blocks the pilot port 26B, so that the pressure in the pilot valve chamber 60 increases and is equalized, and the main valve body 26 comes into contact with the main valve seat 42 against the biasing force of the compression spring 58 to close the valve.

[0046] Furthermore, the solenoid valve 10 is of a cartridge type that can be attached to any flow path block 16 (FIG. 1) for use, and is therefore highly versatile.

[0047] In this manner, according to this embodiment, even if the suction force of the suction element 24 with respect to the first plunger 31 is small, a large flow rate can be ensured when the valve is opened.

[0048] [Second embodiment] In FIGS. 5 to 8, in the solenoid valve 20 according to the present embodiment, a communication portion 34C that communicates with the inside and outside of the kick portion 34 in the pilot valve chamber 60 is provided in the kick portion 34. This communication portion 34C is, for example, a hole formed in the cylindrical portion 34A of the kick portion 34. Note that the communication portion 34C is not limited to such a hole, and may be a groove or uneven shape provided in the engaging portion 34B of the kick portion 34.

[0049] In FIGS. 6 and 7, the operation until the first plunger 31 and the second plunger 32 are lifted is the same as that in the first embodiment. In the present embodiment, regarding the lift amount L1 of the first plunger shown in FIG. 5 and the lift amount L2 of the main valve body 26, L1 ≦ L2 is set. In this case, when the valve is opened, the axial tip (lower surface of the kick portion 34) of the engaging portion 34B of the kick portion 34 abuts on the main valve body 26. Actually, the main valve body 26 moves and abuts on the lower surface of the engaging portion 34B. FIG. 8 shows the case where L1 < L2. In this case, the main valve body 26 abuts on the lower surface of the engaging portion 34B but does not abut on the pipe holder 30. Note that when L1 = L2, the main valve body 26 abuts on the lower surface of the engaging portion 34B and also abuts on the pipe holder 30 (not shown).

[0050] In the present embodiment, compared with the first embodiment, the lift amount L1 in FIG. 5 can be made smaller, and the suction force generated in the attractor 24 becomes larger. Further, when the valve is opened, the main valve body 26 abuts on the tip (engaging portion 34B) of the kick portion 34, so that further movement of the main valve body 26 is restricted. That is, the upper limit of the opening degree of the main valve body 26 can be set by the tip of the kick portion 34. In addition, since the communication portion 34C is provided in the cylindrical portion 34A of the kick portion 34 surrounding the periphery of the second plunger 32, even when the main valve body 26 abuts on the tip of the kick portion 34, the communication state between the inside and outside of the kick portion 34 in the pilot valve chamber 60 is maintained. That is, since the state in which the pilot port 26B is opened is maintained, an increase in the pressure in the pilot valve chamber 60 is suppressed, and the valve-open state is maintained.

[0051] Since other parts are the same as those in the first embodiment, the same parts are denoted by the same reference numerals in the drawings, and the description thereof is omitted.

[0052] [Other embodiments] An example of an embodiment of the present invention has been described above, but the embodiment of the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the spirit and scope of the present invention.

[0053] Although the solenoid valves 10 and 20 are pilot kick type solenoid valves, the present invention is not limited to this and may be a direct acting type in which the main valve body 26 is operated by a direct acting kick action. The valve body 22 is not limited to a cartridge type and may be applicable to a joint type solenoid valve.

[0054] FIG. 9 shows a configuration example in which the characteristic configuration of the present invention is applied to a direct-acting solenoid valve 100. The same reference numerals are used for members having the same action and effect as those in the above-mentioned embodiment, and their description will be omitted. This solenoid valve 100 does not have a pilot-type valve body, and a packing 90 is attached to the second plunger 32. This packing 90 corresponds to the main valve body 26 in the above-mentioned embodiment. That is, in the direct-acting solenoid valve 100, the packing 90 attached to the second plunger 32 opens and closes the main valve seat 42. Specifically, the valve 70 closes when the packing 90 abuts against the main valve seat 42, and the valve 70 opens when the packing 90 separates from the main valve seat 42. After the valve opens, the magnetized second plunger 32 is attracted to the first plunger 31, ensuring an opening area (lift). [Explanation of symbols]

[0055] 10. Solenoid valve 12 Inlet 14 Outlet 16 Flow path block 18 Electromagnetic Coil 20 Solenoid valve 22 Valve body 24 Attractor 26 Main valve body 26B Pilot port 31 First plunger 32 Second plunger 34 Kick Club 34C Communication part 40 Main valve chamber 42 Main valve seat 51 First Channel 52 Second Flow Path 60 Pilot valve chest 62 Pilot valve seat 100 Solenoid valve

Claims

1. a valve body in which a first flow passage and a second flow passage are formed, and a main valve chamber having a main valve seat is provided between the first flow passage and the second flow passage; a suction element attached to the main valve chamber on an axial side opposite to the second flow path; a main valve body provided in the main valve chamber and moving in the axial direction to come into contact with or separate from the main valve seat; a first plunger that is attracted to the magnetized attractor; a second plunger that is attracted to the magnetized first plunger and operates the main valve; a kick portion provided on the first plunger, the kick portion applying an impact to the second plunger in a direction away from the main valve body when the first plunger is attracted by the attractor; A solenoid valve having a

2. a pilot valve chamber is provided between the main valve body and the second plunger, a pilot valve seat and a pilot port that communicates the pilot valve chamber with the second flow path are provided in a portion of the main valve body that faces the pilot valve chamber; a compression spring is provided between the first plunger and the second plunger to bias the second plunger toward the pilot valve chamber; The solenoid valve according to claim 1 , wherein the second plunger opens and closes the pilot port by coming into contact with or moving away from the pilot valve seat.

3. The kick portion surrounds the second plunger and is formed such that an axial tip of the kick portion abuts against the main valve body when the valve is opened.

3. The solenoid valve according to claim 2, wherein the kick portion is provided with a communication portion that communicates with an inside and an outside of the kick portion in the pilot valve chamber.

4. Further, an electromagnetic coil is provided to generate a magnetic field that magnetizes the attractor. The solenoid valve according to claim 1 .

5. The cartridge type is used by being attached to a flow path block having an inlet and an outlet, 5. The solenoid valve according to claim 1, wherein, when attached to the flow path block, the first flow path communicates with the inlet, and the second flow path communicates with the outlet.

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