Solenoid valve

Abstract

The purpose of the present invention is to provide a solenoid valve in which the size of a suction member is reduced. A solenoid valve (10) is provided with: a valve body (12) having a through-hole (14), and a primary-side mounting port (24) and a secondary-side mounting port (26) that communicate with the through-hole (14); a suction member (32) attached to the upper end of the through hole (14); a valve seat member (60) attached to the lower side of the through-hole (14) and forming a valve chamber (20) together with the peripheral wall of the through-hole (14) and the suction member (32); and a main valve body (50) disposed in the valve chamber (20) so as to be in contact with and separated from a main valve seat (62) of the valve seat member (60).

Description

Technical Field

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

[0002] For example, Patent Document 1 discloses a pilot-operated solenoid valve that is assembled by inserting a main valve element and a suction member from a direction facing a main valve seat formed in a valve body.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-007572

[0006] Technical problem to be solved by the invention

[0007] In the pilot-operated solenoid valve of Patent Document 1, the main valve core and the attracting member are incorporated into the valve body from the same side, and the attracting member constitutes a part of the valve chamber on the side where the main valve core is incorporated in the valve chamber, so the diameter of the attracting member is larger than that of the main valve core. The attracting member made of magnetic material is mostly manufactured by cutting or casting, so when the size is large, the increase in cutting amount and the enlargement of the mold become the reasons for the increase in cost. Summary of the invention

[0008] An object of the present invention is to provide a technique for reducing the size of a suction member in a solenoid valve.

[0009] Technical means for solving technical problems

[0010] A solenoid valve of the first type comprises: a valve body having a through hole and a mounting port communicating with the through hole; a suction member installed at one end side of the through hole in an axial direction; a valve seat component installed at the other end side of the through hole in the axial direction, and the valve seat component, the peripheral wall of the through hole and the suction member together form a valve chamber; and a valve core, which is arranged in the valve chamber in a manner of contacting and separating with the valve seat of the valve seat component.

[0011] According to the solenoid valve, a suction piece is installed at one end side in the axial direction of a through hole formed in the valve body, and a valve seat component separate from the valve body is installed on the side opposite to the suction piece in the axial direction of the through hole. Therefore, according to the solenoid valve, since the valve core can be assembled to the valve body from the side opposite to the direction in which the suction piece in the axial direction of the through hole is installed, there is no restriction on the shape of the suction piece. In other words, according to the solenoid valve, the size of the suction piece can be reduced.

[0012] A solenoid valve according to a second aspect is the solenoid valve according to the first aspect, wherein a diameter of the valve seat member is equal to or larger than a diameter of the valve element.

[0013] The solenoid valve of the third embodiment, in the solenoid valve described in the first embodiment or the second embodiment, further comprises a plunger, the plunger is attracted by the magnetized attraction member, the through hole has a reduced diameter portion on one end side in the axial direction, the inner diameter of which is smaller than the diameter of the valve seat member, the attraction member has an attraction portion for attracting the plunger and a fixing portion fixed to the reduced diameter portion.

[0014] According to the solenoid valve, since the valve body has a reduced diameter portion having an inner diameter smaller than that of the main valve core at one end side in the axial direction, the main valve core cannot be pulled out from one side in the axial direction of the through hole. In addition, according to the solenoid valve, since the suction piece has a fixing portion fixed to the reduced diameter portion, the suction piece can be assembled by inserting the suction piece from the other end side in the axial direction.

[0015] A solenoid valve according to a fourth aspect is the solenoid valve according to the third aspect, wherein a diameter of the fixing portion is set to be greater than or equal to a diameter of the suction portion and less than or equal to a diameter of the valve element.

[0016] The fifth mode of the solenoid valve, in the solenoid valve described in any one of the first mode to the fourth mode, further comprises: a compression spring, which applies force to the valve core in a direction of separation from the valve seat; and a spring bearing component, which is supported by the valve seat component and holds the compression spring in a state where the compression spring is separated from the valve seat component.

[0017] According to the solenoid valve, since the compression spring is held in a state separated from the valve seat member, the size of the compression spring relative to the valve chamber becomes smaller. Thus, according to the solenoid valve, the flow path resistance based on the compression spring can be reduced compared to the case where the compression spring is in contact with the valve seat member.

[0018] A sixth aspect of the solenoid valve is the solenoid valve described in any one of the first to fifth aspects, wherein the valve body is provided with an internal thread at the other end of the through hole in the direction in which the through hole extends, and the valve seat component is provided with an external thread that is threadedly engaged with the internal thread of the through hole.

[0019] According to this solenoid valve, by screwing the valve seat member and the valve body together, it is easy to fix components made of different materials.

[0020] The solenoid valve of the seventh mode, in the solenoid valve recorded in any one of the first mode to the sixth mode, further includes a plunger, which moves in the direction of extension of the through hole when the attraction member is magnetized, the valve core has a main valve core and a pilot valve core, the main valve core forms a pilot passage and an equalizing pressure passage, and is in contact and separation with the valve seat, the pilot valve core is connected to the plunger, and is in contact and separation with the pilot valve seat, and the pilot valve seat is formed on one side of the direction in which the through hole of the pilot passage extends.

[0021] An eighth aspect of the electromagnetic valve is the electromagnetic valve according to any one of the first to seventh aspects, further comprising an electromagnetic coil that magnetizes the attracting member.

[0022] Effects of the Invention

[0023] According to the present invention, it is possible to provide a technique for reducing the radial size of a suction member in an electric valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a cross-sectional view of the solenoid valve according to the first embodiment, and is a diagram showing a state of the solenoid valve being in an open valve state.

[0025] Figure 2 It is a plan view of a spring receiving member included in the solenoid valve according to the first embodiment.

[0026] Figure 3 It is a cross-sectional view of a spring receiving member included in the solenoid valve according to the first embodiment.

[0027] Figure 4 It is a side view of the spring receiving member included in the solenoid valve according to the first embodiment.

[0028] Figure 5 It is a cross-sectional view of the solenoid valve according to the first embodiment, and is a diagram showing a state of the solenoid valve being in a closed valve state.

[0029] Figure 6 It is a cross-sectional view of the solenoid valve according to the first embodiment, and is a diagram showing a state in which the pilot valve is opened in the valve closed state.

[0030] Figure 7 It is a cross-sectional view of the solenoid valve according to the first embodiment, and is a diagram showing a state in which the pilot valve is closed in the valve open state.

[0031] Figure 8 It is a cross-sectional view of the solenoid valve according to the second embodiment, and is a diagram showing a state of the solenoid valve being in an open valve state.

[0032] Fig. 9It is a cross-sectional view of the solenoid valve according to the third embodiment, and is a diagram showing a state of the solenoid valve being in an open valve state.

[0033] Explanation of symbols

[0034] 10 Solenoid valve

[0035] 12 Valve body

[0036] 14Through holes

[0037] 14S steps

[0038] 16 Reduced diameter

[0039] 20 Valve chamber

[0040] 21 Main valve chamber

[0041] 22 Pilot valve chamber

[0042] 24 Primary side mounting port (an example of a mounting port)

[0043] 25 inlet flow path

[0044] 26 Secondary side mounting port (an example of mounting port)

[0045] 28 plunger

[0046] 30 Pilot valve core (part of an example of a valve core)

[0047] 32 Attraction parts

[0048] 34 pilot valve gasket

[0049] 35 Main valve gasket

[0050] 36 Large diameter part (an example of fixed part)

[0051] 37 Small diameter part (an example of a suction part)

[0052] 50 Main valve core (part of an example of a valve core)

[0053] 52 pilot valve seat

[0054] 54 pilot pathway

[0055] 56 pressure equalization channel

[0056] 58 Main valve spring (an example of a compression spring)

[0057] 60 valve seat parts

[0058] 62 Main valve seat (an example of a valve seat)

[0059] 64 outlet flow path

[0060] 66 bevel

[0061] 70 Spring bearing parts

[0062] 72 Taiwan Department

[0063] 74 feet

[0064] 76 Cutting and folding part

[0065] 78 Tiptoe

[0066] 82 Shell

[0067] 84 electromagnetic coil

[0068] 91O-ring

[0069] 92 piston ring

[0070] 93O-ring

[0071] 110 Solenoid valve

[0072] 112 Valve body

[0073] 128 Plunger

[0074] 80, 180 tube

[0075] 182 Guide components

[0076] 210 Solenoid valve

[0077] 212 Valve body

[0078] 218 Riveted part

[0079] 260 Valve seat parts

[0080] 268 Riveting section. DETAILED DESCRIPTION

[0081] Hereinafter, an example of an embodiment of the present invention will be described with reference to the accompanying drawings. In addition, in each of the drawings, the same reference numerals are used to indicate the same or equivalent components and parts. In addition, the dimensional ratios of the drawings may be exaggerated for the sake of convenience of description and may be different from the actual ratios.

[0082] In addition, the arrow A shown in each figure is the up-down direction and indicates the upward direction of the electromagnetic valve. In addition, the up-down direction of the electromagnetic valve is consistent with the long side direction of the electromagnetic valve, and the width direction of the electromagnetic valve is consistent with the direction orthogonal to the long side direction. In addition, the electromagnetic valve in this embodiment is not limited to configuring the up-down direction as a direction along the vertical direction, and is not limited to configuring the width direction as a direction along the horizontal direction.

[0083] In addition, the arrow X shown in each figure indicates the lateral width direction of the spring supporting component, the arrow Y indicates the direction orthogonal to the lateral width direction of the spring supporting component, that is, the longitudinal width direction of the spring supporting component, and the arrow Z indicates the direction orthogonal to the lateral width direction and the longitudinal width direction of the spring supporting component, that is, the height direction of the spring supporting component.

[0084] [First embodiment]

[0085] (structure)

[0086] The solenoid valve 10 of the present embodiment includes: a valve body 12, a tube 80 with one end closed, a suction member 32, an electromagnetic coil 84, a housing 82, a plunger 28, and a valve seat member 60. In addition, the solenoid valve 10 of the present embodiment also includes: a main valve spring 58, which is an example of a compression spring that urges the valve core in a direction of separation from the main valve seat 62 of the valve seat member 60; and a spring receiving member 70. In addition, the valve core of the present embodiment includes a main valve core 50 and a pilot valve core 30. In addition, the specific structure of the main valve core 50 and the pilot valve core 30 is described below. The solenoid valve 10 of the present embodiment is, for example, a pilot type solenoid valve used in a refrigeration cycle of an automobile air conditioner. In addition, the solenoid valve 10 of the present embodiment is a so-called normally open type solenoid valve that becomes an open valve state when the electromagnetic coil 84 is not energized.

[0087] like Figure 1 As shown, the valve body 12 is a component having a through hole 14 that penetrates the valve body 12 in the up-down direction, and a primary side mounting port 24 and a secondary side mounting port 26 that communicate with the through hole 14. The through hole 14 has a plurality of sections that are successively reduced in diameter from the lower side toward the upper side. In addition, a reduced diameter portion 16 having the smallest inner diameter is formed at the upper end of the through hole 14. That is, the up-down direction in this embodiment is consistent with the axial direction of the through hole 14. In addition, the upper side of the through hole 14 is an example of one end side of the through hole 14, and the lower side of the through hole 14 is an example of the other end side of the through hole 14.

[0088] In this embodiment, the female thread 18 is formed at the lower end of the through hole 14. A valve seat member 60 described later is inserted from the lower side of the through hole 14, so that a part of the through hole 14 functions as a valve chamber 20.

[0089] In addition, if Figure 1As shown in the figure, the primary side mounting port 24 in the valve body 12 is a portion formed by penetrating the side wall on the left side of the valve body 12 to the through hole 14 through a hole. In addition, the primary side mounting port 24 is formed together with the inlet flow path 25 by cutting the valve body 12 from the wall surface to the through hole 14 using a drill. That is, in the solenoid valve 10 in this embodiment, the primary side mounting port 24 is connected to the through hole 14 from the side. Other pipe bodies not shown in the figure are installed in the primary side mounting port 24, which is an inlet for the fluid to flow into the through hole 14. That is, the primary side mounting port 24 is an example of the mounting port involved in this embodiment.

[0090] In addition, in the present embodiment, the secondary side mounting port 26 is an opening on the lower side of the through hole 14 in the valve body 12. That is, in the solenoid valve 10 in the present embodiment, the secondary side mounting port 26 communicates with the through hole 14 from below. Other pipe bodies, etc., not shown in the figure, are mounted on the secondary side mounting port 26. That is, the secondary side mounting port 26 is another example of the mounting port involved in the present embodiment.

[0091] The suction member 32 is a cylindrical member having a large diameter portion 36 as an example of a fixing portion and a small diameter portion 37 as an example of a suction portion and having a smaller diameter than the large diameter portion 36. The suction member 32 is inserted into the through hole 14 and has the small diameter portion 37 protruding upward from the inside of the valve body 12 on the upper side of the through hole 14. That is, in this embodiment, the diameter of the small diameter portion 37 is smaller than the inner diameter of the reduced diameter portion 16, and the diameter of the large diameter portion 36 is larger than the inner diameter of the reduced diameter portion 16. Figure 1 As shown, the suction member 32 is arranged in a state where the reduced diameter portion 16 and the large diameter portion 36 of the valve body 12 are locked. The lower edge of the large diameter portion 36 of the suction member 32 is fixed by caulking to the upper edge of the pilot valve chamber 22 described later.

[0092] In addition, if Figure 1 As shown, a groove is formed radially outside the large diameter portion 36, and an O-ring 91 is provided in the groove to close the gap between the reduced diameter portion 16 and the large diameter portion 36. In addition, the suction member 32 is a member having a hole passing through in the vertical direction, and the pilot valve core 30 described later is arranged in a state of passing through the hole.

[0093] In addition, as an example, the attracting member 32 according to the present embodiment is made of a soft magnetic body such as magnetic stainless steel, and is formed by cutting so that the vertical direction is the longitudinal direction.

[0094] The tube 80 is a bottomed cylindrical member that covers the upper end of the suction member 32. Figure 1 As shown, the tube 80 accommodates the plunger 28 described later in the state of being assembled as the solenoid valve 10, and the lower end (opening side) is airtightly joined to the suction member 32. An example of a method of joining the tube 80 and the suction member 32 is welding.

[0095] like Figure 1 As shown, the housing 82 is a substantially U-shaped or substantially U-shaped member having an upper plate 82U and a lower plate 82L connected to each other on the back side of the paper, wherein the upper plate 82U has a hole for the pipe 80 to pass through in the vertical direction, and the lower plate 82L has a hole for the pipe 80 to pass through in the vertical direction. Figure 1 As shown, the lower plate 82L of the housing 82 is installed in contact with the attracting member 32. As described later, when the electromagnetic coil 84 is energized to generate a magnetic field, a magnetic circuit is formed through the lower plate 82L of the housing 82 and the attracting member 32. In addition, the lower plate 82L of the housing 82 is installed on the valve body 12 by installing screws 94.

[0096] like Figure 1 As shown, the electromagnetic coil 84 is attached to the outer periphery of the pipe 80 and is disposed so as to be sandwiched between the upper plate 82U and the lower plate 82L of the housing 82. When current flows through the winding of the electromagnetic coil 84, the electromagnetic coil 84 magnetizes the attracting member 32.

[0097] like Figure 1 As shown, the plunger 28 is a soft magnetic member housed inside the tube 80 and arranged above the attracting member 32. The plunger 28 is arranged side by side with the attracting member 32 in the vertical direction via a coil spring, and is driven in the vertical direction by switching the current of the electromagnetic coil 84 on and off. Figure 1 As shown, when the electromagnetic coil 84 is turned off, the plunger 28 is separated from the attracting member 32 in the vertical direction by the pilot spring 38 as a compression spring.

[0098] In addition, the plunger 28 is connected to a pilot valve element 30 which is a part of a valve element described later at the lower end side. The pilot valve element 30 will be described below.

[0099] In addition, if Figure 1 As shown, when the solenoid valve 10 is in the valve open state, the plunger 28 is separated from the plunger 28 by the suction piece 32 and the pilot spring 38. The pilot spring 38 is arranged between the upper side of the suction piece 32 and the lower side of the plunger 28.

[0100] like Figure 1 As shown, the valve element in this embodiment includes a main valve element 50 and a pilot valve element 30 .

[0101] The main valve core 50 has an outer diameter slightly smaller than the inner diameter of the valve chamber 20 and larger than the large diameter portion 36, and the pilot passage 54 that passes through in the up-down direction is a component that is open in the center of the radial direction. In addition, at a position of the main valve core 50 that is separated from the pilot passage 54 in the radial direction (outer side of the pilot passage 54 in the radial direction), an equalizing passage 56 that passes through in the up-down direction is open. The upper end of the pilot passage 54 is a pilot valve seat 52, which is used for contact and separation of the pilot valve core 30 as described later. In addition, in this description, "contact and separation" means that the structures of both parties contact and separate from each other, and switch the contact state of the structures. In addition, a main valve gasket 35 is installed at the lower end of the pilot passage 54.

[0102] In addition, a piston ring 92 is installed on the side wall of the main valve core 50 to adjust the area of ​​the gap generated between the main valve core 50 and the side wall of the through hole 14. The piston ring 92 is used to adjust the cross-sectional area of ​​the pilot passage 54 to be larger than the sum of the cross-sectional area of ​​the gap generated between the main valve core 50 and the side wall of the through hole 14 and the cross-sectional area of ​​the equalizing passage 56.

[0103] like Figure 1 As shown, the pilot valve core 30 is a member that is passed through a hole that penetrates the suction member 32 in the up-down direction and is arranged between the suction member 32 and the main valve core 50. In addition, the pilot valve core 30 is connected to the plunger 28 at the upper end side compared to the suction member 32. In addition, a pilot valve gasket 34 is provided at the lower side of the pilot valve core 30, and the pilot valve core 30 is in contact with and separated from the pilot valve seat 52 via the pilot valve gasket 34. When the pilot valve seat 52 is in close contact with the pilot valve gasket 34, the upper side of the pilot passage 54 is closed by the pilot valve gasket 34.

[0104] In addition, if Figure 1 and the following Figure 5 As shown in FIG. 1 , the lower end of the pilot valve core 30 is disposed in the pilot valve chamber 22, which is a space above the main valve core 50 in the valve chamber 20. Figure 5 As shown, even when the pilot valve core 30 is in contact with the main valve core 50 and the upper end of the pilot passage 54 is closed, the pilot valve chamber 22 has a gap generated radially outside the pilot valve seat 52. Figure 1 and Figure 5 As shown, the upper end of the equalizing passage 56 is connected to the pilot valve chamber 22 , and even when the pilot valve seat 52 of the main valve core 50 is closed by the pilot valve core 30 , the upper end of the equalizing passage 56 remains open to the pilot valve chamber 22 .

[0105] like Figure 1As shown in FIG. 1 , the valve seat member 60 in this embodiment is a member having an outlet flow path 64 that penetrates in the up-down direction, and is inserted into the valve body 12 from the lower end of the through hole 14. In addition, the outlet flow path 64 is an outlet for the fluid to flow out of the through hole 14. In addition, the diameter of the valve seat member 60 is larger than the diameter of the main valve core 50. In addition, the position of the lower end (lower surface portion) of the valve seat member 60 in this embodiment is as shown in FIG. Figure 1 As shown, it is substantially the same as the lower end of the through hole 14 .

[0106] On the upper side of the valve seat member 60, an example of a valve seat in this embodiment, i.e., a main valve seat 62 that contacts and separates from the above-mentioned main valve gasket 35 is formed. When the main valve gasket 35 contacts the main valve seat 62, the main valve seat 62 is closed. In addition, when the valve seat member 60 is inserted into the through hole 14, the through hole 14 is closed, so that the through hole 14 functions as a valve chamber 20. In other words, by installing the valve seat member 60 in the through hole 14 of the valve body 12, the valve chamber 20 is formed by the suction member 32 locked on the upper side of the through hole 14, the valve seat member 60, and the peripheral wall of the through hole 14. In addition, in the following description, the part of the valve chamber 20 other than the pilot valve chamber 22 is referred to as the main valve chamber 21. That is, the main valve core 50 is arranged in the main valve chamber 21.

[0107] In addition, in this embodiment, if Figure 1 As shown in FIG. 1 , the valve seat member 60 is shaped so that the main valve seat 62 protrudes upward from the lower end of the inlet flow path 25. In addition, the valve seat member 60 is formed with an inclined surface 66 in such a manner that the main valve seat 62 side becomes thinner from the radially outer side toward the inner side. In other words, in the solenoid valve 10 of the present embodiment, in the valve open state, the main valve gasket 35 as the lower surface portion of the main valve core 50 is located above the lower end 25L of the inlet flow path 25.

[0108] In this embodiment, the outer peripheral surface of the valve seat member 60 is formed with an external thread 68 , so that the valve seat member 60 can be attached to the valve body 12 by being screwed with the internal thread 18 formed on the inner peripheral surface of the lower side of the through hole 14 of the valve body 12 .

[0109] Furthermore, the valve seat member 60 has an O-ring 93 on the outer peripheral surface. The O-ring 93 closes the gap between the valve body 12 and the valve seat member 60 to prevent the fluid from leaking from the outer peripheral side of the valve seat member 60.

[0110] like Figure 1As shown, the main valve spring 58 in this embodiment is a component assembled inside the valve chamber 20 and applies force to the main valve core 50 in a direction of separation relative to the main valve seat 62. More specifically, the main valve spring 58 is a coil spring that applies force to the main valve core 50 in an upward direction. In this embodiment, the main valve spring 58 is arranged between the spring bearing component 70 and the main valve core 50.

[0111] like Figure 1 and Figures 2 to 4 As shown in FIG. 1 , the spring receiving member 70 in this embodiment is a member having a platform 72 formed in an annular shape as an example and three legs 74 extending downward from the platform 72. Figure 1 As shown, the spring receiving member 70 is assembled with the leg portion 74 as the lower side. The lower side of the leg portion 74 is supported by the valve seat member 60 , and the upper side of the platform portion 72 abuts against the main valve spring 58 to support the lower side of the main valve spring 58 .

[0112] In addition, in this embodiment, if Figures 2 to 4 As shown, each leg portion 74 is formed with a cut-and-folded portion 76 that is cut and folded outward in the radial direction. Figure 1 As shown, the cutout portion 76 is formed in a shape that abuts against the side wall of the through hole 14 when assembled in the valve chamber 20. The cutout portion 76 can prevent abnormal noise caused by vibration of the leg portion 74.

[0113] In addition, in this embodiment, if Figure 1 As shown, the foot portion 74 preferably has its top end (i.e., the lower side) or toe 78 bent radially outward. In this embodiment, the spring receiving member 70 is hooked on the step 14S in the through hole 14 by bending the toe 78 radially outward, and is shaped to be placed on the valve seat member 60.

[0114] In addition, in this embodiment, if Figures 2 to 4 As shown in the figure, the foot portions 74 of the spring receiving member 70 are formed at equal intervals relative to the circumferential direction of the platform portion 72. In other words, in the present embodiment, the foot portions 74 are formed 120 degrees apart from each other. In addition, in the present embodiment, each foot portion 74 of the spring receiving member 70 is arranged at a position deviated from the path of the fluid flowing from the primary side mounting port 24 toward the valve chamber 20. In other words, the spring receiving member 70 is arranged so that the fluid passes between the two foot portions 74 when flowing from the primary side mounting port 24 into the valve chamber 20.

[0115] In addition, in the present embodiment, the spring receiving member 70 may be formed by any material and method, but as an example, it is formed by pressing a stainless steel material.

[0116] In the structure of the solenoid valve 10 of the present embodiment, the diameter refers to the size of the largest part in the direction perpendicular to the vertical direction. The diameter can be measured using any instrument, but as an example, a vernier caliper is used to measure the outer diameter and the inner diameter. In addition, the diameter of the valve core in the present embodiment is as follows: Figure 1 The outer diameter of the main valve element 50 shown is larger than that of the pilot valve element 30 .

[0117] Next, refer to Figure 1 , Figures 5 to 7 The operation of the solenoid valve 10 in the present embodiment will be described. In the description of the operation of the solenoid valve 10 in the present embodiment, the pressure on the inlet flow path 25 side is higher than the pressure on the outlet flow path 64 side.

[0118] (Driving of the Solenoid Valve 10)

[0119] In the solenoid valve 10 of the present embodiment, when current flows through the winding of the electromagnetic coil 84, the plunger 28 disposed above the attracting member 32 is attracted downward by the magnetic field generated by the electromagnetic coil 84, and the plunger 28 moves downward. Figure 5 As shown, the pilot valve element 30 connected to the plunger 28 moves downward. Then, the pilot valve element 30 closes the pilot valve seat 52, so that the main valve element 50 moves downward, and the main valve element 50 closes the main valve seat 62, and the solenoid valve 10 enters the closed valve state.

[0120] Therefore, in Figure 5 In the closed valve state shown, the internal pressure of the main valve chamber 21 is higher than the internal pressure of the outlet flow path 64. In addition, in the closed valve state, since the pilot valve chamber 22 is connected to the valve chamber 20 via the pressure equalization passage 56 (more accurately, the refrigerant also passes through the gap between the outer peripheral surface of the main valve core 50 and the inner peripheral surface of the main valve chamber 21. The same also applies to the following description), the internal pressure of the pilot valve chamber 22 is the same as that of the main valve chamber 21. In addition, by applying the internal pressure to the pilot valve chamber 22, the main valve core 50 is pressed downward, the main valve seat 62 is in strong contact with the main valve core 50, and the solenoid valve 10 maintains the closed valve state.

[0121] Next, when the energization of the electromagnetic coil 84 is stopped, Figure 6 As shown, the plunger 28 is lifted upward by the spring. In addition, since the pilot valve element 30 also moves upward together with the plunger 28, the pilot valve gasket 34 is separated from the pilot valve seat 52, and the pilot valve becomes an open valve state.

[0122] Then, if Figure 6As shown, the fluid flowing in from the inlet flow path 25 flows into the pilot valve chamber 22 through the main valve chamber 21 and the pressure equalizing passage 56, and flows into the outlet flow path 64 through the pilot passage 54. Since the amount of refrigerant flowing out to the outlet flow path 64 through the pilot passage 54 is greater than the amount of refrigerant flowing into the pilot valve chamber 22, the internal pressure of the pilot valve chamber 22 is lower than the internal pressure of the main valve chamber 21. Due to this pressure difference, the main valve core 50 moves toward the pilot valve chamber 22.

[0123] If the differential pressure between the inlet flow path 25 and the outlet flow path 64 is small, the differential pressure between the pilot valve chamber 22 and the main valve chamber 21 becomes low. However, in this case, the main valve element 50 is lifted upward by the main valve spring 58. Figure 1 As shown, the main valve element 50 is separated from the main valve seat 62, and the solenoid valve 10 is in the valve-open state.

[0124] In addition, from Figure 1 From the state shown in FIG. 1 , when the current flows through the electromagnetic coil 84 again, the attraction member 32 first attracts the plunger 28 downward, as shown in FIG. Figure 7 As shown in FIG. 1 , the pilot valve core 30 is brought into contact with the pilot valve seat 52, and the pilot valve is in a closed state. Since the refrigerant does not flow out of the pilot valve chamber 22, the internal pressure of the pilot valve chamber 22 is higher than the internal pressure of the main valve chamber 21. Due to this pressure difference, the main valve core 50 moves downward and is pressed against the main valve seat 62. As a result, the solenoid valve 10 is closed again as shown in FIG. Figure 5 The valve is in the closed state as shown.

[0125] In this way, the main valve core 50 and the pilot valve core 30 move in the vertical direction inside the valve chamber 20 of the through hole 14. In other words, the main valve core 50 moves in the direction of contacting with or separating from the main valve seat 62, and the pilot valve core 30 moves in the direction of contacting with or separating from the pilot valve seat 52.

[0126] Next, the operation and effects of this embodiment will be described.

[0127] (Effect)

[0128] According to the solenoid valve 10 of the present embodiment, the suction member 32 is installed on one end side in the axial direction of the through hole 14 formed in the valve body 12, and the valve seat member 60 which is separate from the valve body 12 is installed on the side opposite to the suction member 32 in the axial direction of the through hole 14. In addition, in the solenoid valve 10 of the present embodiment, the diameter of the valve seat member 60 is greater than the diameter of the main valve core 50. In addition, in the solenoid valve 10 of the present embodiment, the diameter of the large diameter portion 36 is greater than the diameter of the small diameter portion 37, and the diameter of the large diameter portion 36 is less than the diameter of the main valve core 50.

[0129] According to the solenoid valve 10 of this embodiment, since the main valve core 50 can be assembled to the valve body 12 from the side opposite to the direction in which the suction member 32 in the axial direction is installed in the through hole 14, there is no restriction on the shape of the suction member 32. In other words, according to the solenoid valve 10 of this embodiment, there is no restriction on the diameter of the suction member 32. Therefore, according to the solenoid valve 10, the diameter of the suction member 32, that is, the size of the suction member 32 can be reduced.

[0130] Furthermore, since the attracting member 32 made of a magnetic material is often manufactured by cutting or casting, if the size is large, the increase in cutting amount and the enlargement of the mold will cause a cost increase.

[0131] Here, in the solenoid valve 10 according to the present embodiment, it is possible to reduce the size of the suction member 32. Therefore, according to the solenoid valve 10 according to the present embodiment, it is possible to reduce the manufacturing cost of the solenoid valve 10.

[0132] In addition, according to the solenoid valve 10 of the present embodiment, since the valve body 12 has the reduced diameter portion 16 having an inner diameter smaller than that of the main valve core 50 at one end side in the axial direction, the main valve core 50 cannot be pulled out from one side in the axial direction of the through hole 14. In addition, according to the solenoid valve 10, since the suction member 32 has a fixing portion fixed to the reduced diameter portion 16, the suction member 32 can be inserted from the other end side in the axial direction for assembly.

[0133] In addition, according to the solenoid valve 10 of this embodiment, by screwing the valve seat member 60 and the valve body 12, it is easy to fix the components of different materials. In addition, the valve body 12 of this embodiment is made of aluminum alloy, and the valve seat member 60 is, for example, stainless steel. In addition, the sealing performance is ensured by the O-ring 93.

[0134] In addition, in the solenoid valve 10 of the present embodiment, in the valve open state, the lower end of the main valve core 50, that is, the main valve gasket 35, is located above the lower end of the inlet flow path 25. Therefore, according to the solenoid valve 10 of the present embodiment, compared with the case where the main valve chamber 21 side of the valve seat member 60 and the lower end of the inlet flow path 25 are at the same level, the flow path resistance to the liquid flowing from the inlet flow path 25 into the main valve chamber 21 can be reduced. In addition, in the solenoid valve 10 of the present embodiment, a slope 66 whose top tapers as it goes upward is formed on the upper part of the valve seat member 60. Therefore, according to the solenoid valve 10 of the present embodiment, compared with the case where the main valve chamber 21 side of the valve seat member 60 does not taper, the flow path resistance to the liquid flowing from the inlet flow path 25 into the main valve chamber 21 can be reduced.

[0135] In addition, the solenoid valve 10 of this embodiment also includes: a main valve spring 58, which applies force to the main valve core 50 in a direction of separation from the main valve seat 62; and a spring receiving component 70, which holds the main valve spring 58 in a state separated from the valve seat component 60.

[0136] According to the solenoid valve 10, since the main valve spring 58 is held in a state separated from the valve seat member 60, the size of the main valve spring 58 relative to the valve chamber 20 becomes smaller. Therefore, according to the solenoid valve 10, the flow path resistance formed by the main valve spring 58 can be reduced compared to the case where the main valve spring 58 is in contact with the valve seat member 60.

[0137] In addition, in the present embodiment, each leg portion 74 of the spring receiving member 70 is arranged at a position deviated from the path of the fluid flowing from the primary side mounting port 24 toward the valve chamber 20. Therefore, according to the spring receiving member 70 in the present embodiment, the flow path resistance can be suppressed compared to the case where the leg portion 74 is arranged toward the primary side mounting port 24 side.

[0138] In addition, in the present embodiment, the spring receiving member 70 is in a state of being assembled inside the valve chamber 20, and is in a shape in which the cut-out portion 76 is in close contact with the side wall of the through hole 14. Thus, the spring receiving member 70 can be prevented from being radially displaced relative to the main valve chamber 21 due to the fluid flowing into the main valve chamber 21 and the vibration based on the driving of the main valve core 50.

[0139] Next, a solenoid valve 110 according to a second embodiment of the present invention will be described. The same components of the solenoid valve 110 according to the second embodiment as those of the first embodiment are denoted by the same reference numerals as those of the first embodiment, and their detailed descriptions are omitted.

[0140] [Second embodiment]

[0141] like Figure 8 As shown in FIG. 1 , the solenoid valve 110 according to the second embodiment of the present invention is different from the solenoid valve 10 according to the first embodiment in the following locations.

[0142] (structure)

[0143] The solenoid valve 110 according to the present embodiment is provided with a tube 180 with both ends opened in the up-down direction instead of the tube 80 of the solenoid valve 10 according to the first embodiment. The tube 180 is similar to the tube 80, and the lower end side is joined to the small diameter portion 37 of the suction member 32. In addition, the upper end side of the tube 180 is joined to a guide member 182. The guide member 182 closes the upper end of the tube 180, and an internal thread 184 is formed on the upper side. In addition, as an example, the joining method of the guide member 182 and the tube 180 is welding.

[0144] In addition, in the present embodiment, the upper plate 82U of the housing 82 is mounted by screwing the mounting screws 94 into the internal threads 184 of the guide member 182 .

[0145] The plunger 128 is a soft magnetic member housed inside the tube 180 and arranged above the attractor 32 , similarly to the solenoid valve 110 according to the first embodiment, and its lower end is connected to the pilot valve element 30 .

[0146] The valve body 112 according to this embodiment is the same as the solenoid valve 10 according to the first embodiment except that it does not have an internal thread for mounting the housing 82. The other structures are the same as those of the solenoid valve 10 according to the first embodiment.

[0147] (Function and Effect)

[0148] The solenoid valve 110 according to the present embodiment can also achieve the same operations and effects as those of the solenoid valve 10 according to the first embodiment.

[0149] Next, a solenoid valve 210 according to a third embodiment of the present invention will be described. The same reference numerals as those in the first or second embodiment are used for the same structures of the solenoid valve 210 according to the third embodiment, and detailed descriptions thereof are omitted.

[0150] [Third Embodiment]

[0151] like Fig. 9 As shown in FIG. 1 , the solenoid valve 210 according to the third embodiment of the present invention is different from the solenoid valve 110 according to the second embodiment in the following locations.

[0152] (structure)

[0153] In the valve body 212 of the solenoid valve 210 according to the present embodiment, instead of the valve body 112 of the solenoid valve 210 according to the second embodiment, a caulking portion 268 is formed at the lower end of the through hole 14 instead of the internal thread 18 .

[0154] In addition, the valve seat member 260 according to the present embodiment replaces the valve seat member 60 of the solenoid valve 110 according to the second embodiment, and has a caulked portion 218 formed on the lower end side instead of the external thread 68 .

[0155] The valve seat member 260 according to the present embodiment is inserted into the through hole 14 from below and then caulked to the caulked portion 268 by a caulked device (not shown). Thus, the valve seat member 260 according to the present embodiment is fixed to the through hole 14.

[0156] In addition, the other structures are the same as those of the solenoid valve 110 according to the second embodiment.

[0157] (Function and Effect)

[0158] The solenoid valve 210 according to the present embodiment can also obtain the same operations and effects as those of the solenoid valves 10 and 110 according to the first and second embodiments.

[0159] [Other embodiments]

[0160] In addition, in the above description, the solenoid valve 10, 110, 210 is configured in a state where the main valve spring 58 is separated from the valve seat member 60 via the spring receiving member 70, but the solenoid valve 10, 110, 210 involved in this embodiment is not limited to this. That is, the main valve spring 58 may press the main valve core 50 upward in a state of contacting the valve seat member 60 without the spring receiving member 70.

[0161] In addition, in the above description, the diameter of the small diameter portion 37 of the suction member 32 is set to be smaller than the diameter of the large diameter portion 36, but the suction member 32 is not limited to this, and can also be set to a member whose diameter does not change in the up and down direction. That is, as long as the suction member 32 can be installed at the upper end of the through hole 14, it can also be locked without being fixed. In this case, a method of forming an internal thread 18 at the upper end of the through hole 14 and forming an external thread 68 on the suction member 32, thereby fixing by screwing, can also be adopted.

[0162] In addition, in the above description, the diameter of the valve seat member 60 is set to be larger than the diameter of the valve core, but the valve seat member 60 involved in this embodiment is not limited to this. That is, as long as the flow rate of the fluid flowing through the outlet flow path 64 can reach a desired flow rate, the valve seat member 60 may also be a member whose diameter does not change in the vertical direction.

[0163] In the above description, the outlet flow path 64 of the valve seat member 60 faces downward, but the solenoid valve 10, 110, 210 involved in the present embodiment is not limited to this. That is, the outlet flow path 64 may be formed to face a direction other than downward by opening from the side wall of the valve body 12 toward the through hole 14 at the position where the valve seat member 60 is inserted. In this case, the outlet flow path 64 is formed in the valve seat member 60, which opens from the through hole 14 toward the outside in the radial direction, and the secondary side mounting port 26 is formed in the side wall of the valve body 12.

[0164] In addition, in the above description, the valve core of the solenoid valve 10, 110, 210 is a pilot-operated solenoid valve 10, 110, 210 having a main valve core 50 and a pilot valve core 30 connected to the plunger 28, but the solenoid valve to which the technology of the present invention can be applied is not limited to this. That is, the valve core is not a pilot-operated solenoid valve 10, 110, 210 having a pilot valve core 30 and a main valve core 50, but a direct-acting solenoid valve in which the plunger 28 directly drives the main valve core 50 can also be applied.

[0165] In addition, in the above description, the solenoid valves 10, 110, and 210 are so-called normally open solenoid valves that are in an open valve state when the solenoid coil 84 is not energized, but the solenoid valves to which the technology involved in this embodiment can be applied are not limited thereto. That is, the technology described above can also be applied to so-called normally closed solenoid valves that are in a closed valve state when the solenoid coil 84 is not energized.

[0166] In addition, in the above description, in the through hole 14 of the solenoid valve 10, 110, 210, the primary side mounting port 24 located on the side is set as the inlet for the fluid to flow in, and the secondary side mounting port 26 located on the lower end is set as the outlet for the fluid to flow out, but the solenoid valve to which the technology involved in this embodiment can be applied is not limited to this. For example, in a direct-acting solenoid valve, the flow direction of the fluid is not limited to the above description, and the secondary side mounting port 26 can also be set as the inlet for the fluid to flow in, and the primary side mounting port 24 can be set as the outlet for the fluid to flow out.

[0167] In addition, in the above description, a tube body is installed in the primary side installation port 24 and the secondary side installation port 26 of the valve body 12, but the solenoid valve to which the technology involved in this embodiment can be applied is not limited to this. That is, the object installed in the primary side installation port 24 and the secondary side installation port 26 is not limited to the tube body, as long as it is a component that forms a flow path together with the solenoid valve 10, 110, 210. For example, the solenoid valve 10, 110, 210 can also be installed with other tube bodies via the valve seat component 60.

[0168] In addition, in the above description, the lower end of the valve seat member 60 is substantially equal to the lower end of the through hole of the valve seat member 60, but the solenoid valve that can realize the technology involved in this embodiment is not limited to this. That is, the valve seat member 60 may be pulled into the inside of the through hole 14 from the lower surface of the valve body 12, 112, 212, or may protrude from the lower surface of the valve body 12, 112, 212. When the valve seat member 60 is pulled into the inside of the through hole 14 from the lower surface of the valve body 12, 112, 212, the secondary side mounting port 26 of the valve body 12, 112, 212 functions as an outflow port for the outflow of the fluid.

[0169] In these modified examples as well, the same operations and effects as those of the solenoid valves 10 , 110 , and 210 according to the first to third embodiments can be obtained.

[0170] The embodiments of the present invention have been described above with reference to the attached drawings. A person skilled in the art who has common knowledge in the technical field to which the present invention belongs can obviously think of various modification examples or application examples within the scope of the technical idea described in the scope of the patent claim, and it should be understood that these contents naturally belong to the technical scope of the present invention.

Claims

1. A solenoid valve, characterized in that: have: A valve body having a through hole and a mounting opening communicating with the through hole; An attraction member installed at one end side of the through hole in the axial direction; a valve seat member mounted on the other end side of the through hole in the axial direction, wherein the valve seat member, the peripheral wall of the through hole and the suction member together form a valve chamber; and A valve element is disposed in the valve chamber so as to be in contact with and separated from a valve seat of the valve seat member.

2. The solenoid valve according to claim 1, characterized in that: The diameter of the valve seat member is larger than the diameter of the valve element.

3. The solenoid valve according to claim 1, characterized in that: It also includes a plunger, which is attracted by the magnetized attracting member. The through hole has a reduced diameter portion having an inner diameter smaller than a diameter of the valve seat member at one end side in the axial direction. The suction member includes a suction portion that sucks the plunger and a fixing portion that is fixed to the reduced diameter portion.

4. The solenoid valve according to claim 3, characterized in that: The diameter of the fixing portion is set to be greater than or equal to the diameter of the suction portion and less than or equal to the diameter of the valve element.

5. The solenoid valve according to claim 1, characterized in that: Also available: a compression spring that applies force to the valve core in a direction of separating from the valve seat; and A spring receiving member is supported by the valve seat member and holds the compression spring in a state where the compression spring is separated from the valve seat member.

6. The solenoid valve according to claim 1, characterized in that: The valve body is formed with an internal thread at the other end of the through hole in the direction in which the through hole extends. The valve seat member is formed with an external thread that is threadably engaged with the internal thread of the through hole.

7. The solenoid valve according to claim 1, characterized in that: A plunger is further provided, the plunger moving in the direction in which the through hole extends when the attracting member is magnetized, The valve core has a main valve core and a pilot valve core, the main valve core forms a pilot passage and an equalizing pressure passage, and is in contact and separation with the valve seat, the pilot valve core is connected to the plunger, and is in contact and separation with the pilot valve seat, and the pilot valve seat is formed on one side of the direction in which the through hole of the pilot passage extends.

8. The solenoid valve according to any one of claims 1 to 7, characterized in that: An electromagnetic coil is further provided, and the electromagnetic coil magnetizes the attracting member.

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