Electrically driven valve

Abstract

The invention provides an electrically driven valve capable of easily changing specifications and applications. An electrically driven valve is provided with: a valve body; a valve body having a valve chamber in which the valve body moves in one direction, a first flow path that opens at a first side portion located in a direction intersecting the one direction and communicates with the valve chamber, and a mounting hole that opens at a second side portion located at one side of the one direction of the valve chamber and communicates with the valve chamber; and a seat member which is attached to a second side portion side, which is a side in which the mounting hole is formed, with respect to the valve chamber of the valve main body in a state in which a part of the seat member is inserted into the mounting hole, and which is provided with a second flow path that communicates with the valve chamber and opens at an end portion on the opposite side from the valve chamber side, and with a seating portion. And a seating portion provided on the valve chamber side of the second flow path, the valve body being brought into contact with and separated from the seating portion as the valve body moves in one direction.

Description

Technical Field

[0001] The present invention relates to an electric drive valve. Background Art

[0002] There is known an electric drive valve described in, for example, Patent Document 1.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2023-97936

[0006] The electric drive valve of Patent Document 1 is a so-called cartridge solenoid valve and is used by being installed in a flow path block having a plurality of flow paths.

[0007] Such a cartridge solenoid valve includes a valve body having a valve seat that abuts against a main valve element. However, it is necessary to prepare a plurality of valve bodies having different valve diameters and structures of the seating portions that come into contact with the main valve element according to specifications and uses such as flow rate and operability, and there is room for improvement. Summary of the Invention

[0008] In view of the above facts, an object of the present invention is to provide an electric drive valve that can easily change specifications and uses.

[0009] The electric drive valve according to the first aspect includes: a valve element; a valve body having a valve chamber, a first flow path, and a mounting hole, the valve chamber allowing the valve element to move in one direction, the first flow path opening on a first side portion in a direction intersecting the one direction and communicating with the valve chamber, the mounting hole opening on a second side portion of the valve chamber on the one direction side and communicating with the valve chamber; and a seat member, the seat member being mounted on the second side portion side of the valve body in a state where a part thereof is inserted into the mounting hole, having a second flow path that communicates with the valve chamber and opens at an end portion on a side opposite to the valve chamber side, and having a seating portion provided on the valve chamber side of the second flow path, the valve element coming into contact with and separating from the seating portion as it moves in the one direction.

[0010] In the electric drive valve according to the first aspect, the valve can be set to the closed valve state by moving the valve element in the valve chamber so that the valve element abuts against the seating portion of the seat member, and can be set to the open valve state by separating the valve element from the seating portion.

[0011] In the electric drive valve according to the first mode, since the seating portion and the second flow path that come into contact with and separate from the valve element are provided in the seat member that is separate from the valve body, by simply replacing the seat member with different dimensions and shapes of the seating portion and the second flow path, it is possible to change the specifications and uses of the electric drive valve without changing the valve body. In other words, the electric drive valve according to the first mode enables the valve body to be shared among valves with different specifications and uses. To change the specifications and uses, it is only necessary to replace the seat member, so it is possible to easily change the specifications and uses.

[0012] The electric drive valve according to the second mode is the electric drive valve according to the first mode, in which the drive portion for driving the valve element is provided on the side of the valve body opposite to the second side portion.

[0013] In the electric drive valve according to the second mode, the drive portion can be used to drive the valve element.

[0014] Since the seat member is not arranged on the side of the valve body opposite to the second side portion, the drive portion can be easily arranged without interfering with the seat member.

[0015] The electric drive valve according to the third mode is the electric drive valve according to the first mode or the second mode, in which an external thread is formed on the outer peripheral portion of the seat member, and an internal thread for screwing the external thread is formed in the mounting hole of the valve body. The seat member is fixed to the valve body by screwing the external thread into the internal thread.

[0016] In the electric drive valve according to the third mode, since the seat member is fixed to the valve body by screwing the external thread of the seat member into the internal thread of the valve body, it is possible to prevent the seat member from detaching from the valve body due to the fluid pressure.

[0017] The electric drive valve according to the fourth mode is the electric drive valve according to the third mode, in which a conical tapered portion is formed on the outer peripheral portion of the seat member, and a conical hole wall that abuts against the tapered portion is formed in the mounting hole of the valve body.

[0018] In the electric drive valve according to the fourth mode, by screwing the external thread of the seat member into the internal thread of the valve body and making the conical tapered portion formed on the outer peripheral portion of the seat member abut against the conical hole wall formed in the mounting hole of the valve body, a large frictional force can be generated between the tapered portion and the conical hole wall, and loosening of the seat member screwed into the valve body can be prevented.

[0019] In addition, since the conical hole wall is formed in the mounting hole and the conical tapered portion is formed on the seat member, when the seat member is inserted into the mounting hole, the tapered portion of the seat member is guided by the conical hole wall of the mounting hole, and the axis of the seat member can be made to coincide with the axis of the mounting hole, so that it is easy to screw the external thread of the seat member with the internal thread of the valve body.

[0020] The electric drive valve according to the fifth mode is an electric drive valve according to any one of the first to fourth modes. In the seat member, a flange is formed on a side opposite to the seating portion side, and a sealing member is disposed between the flange and the second side portion of the valve body.

[0021] In the electric drive valve according to the fifth mode, by disposing the sealing member between the flange of the seat member and the second side portion of the valve body, when the valve body of the electric drive valve is inserted and installed in the hole of the flow path block, the valve body and the flow path block can be sealed by the sealing member.

[0022] In addition, in the electric drive valve according to the fifth mode, it is not necessary to form a groove for embedding the sealing member in the seat member for disposing the sealing member.

[0023] The electric drive valve according to the sixth mode is an electric drive valve according to any one of the first to fifth modes. A check valve is provided in the seat member, and the check valve allows the fluid to move from the first flow path side to the second flow path side and blocks the fluid from moving from the second flow path side to the first flow path side.

[0024] In the electric drive valve according to the sixth mode, since a check valve that allows the fluid to move from the first flow path side to the second flow path side and blocks the fluid from moving from the second flow path side to the first flow path side is provided in the seat member, for example, when the pressure on the second flow path side is higher than the pressure on the first flow path side, the situation where the fluid flows backward from the second flow path to the first flow path can be suppressed.

[0025] The electric drive valve according to the seventh mode is an electric drive valve according to any one of the first to sixth modes. A filter for capturing foreign matter in the fluid is provided in the second flow path.

[0026] In the electric drive valve according to the seventh mode, foreign matter in the fluid flowing in the second flow path can be captured by the filter. The situation where foreign matter flows to the downstream side of the second flow path can be suppressed.

[0027] The electric drive valve according to the eighth mode is an electric drive valve according to any one of the first to fifth modes, in which a check valve is provided in the seat member, and the check valve is configured to include: a check valve core that is movably disposed in the second flow path; a check valve seat against which the check valve core abuts; a spring that biases the check valve core toward the check valve seat; and a plurality of guide portions that guide the check valve core to slide on the inner surface of the second flow path, and the check valve allows fluid to move from the first flow path side to the second flow path side and prevents fluid from moving from the second flow path side to the first flow path side. A filter is provided in the second flow path, and the filter is disposed inside the plurality of guide portions and captures foreign matter in the fluid.

[0028] In the electric drive valve according to the eighth mode, a check valve that allows fluid to move from the first flow path side to the second flow path side and prevents fluid from moving from the second flow path side to the first flow path side is provided in the seat member. Therefore, for example, when the pressure on the second flow path side is higher than the pressure on the first flow path side, it is possible to suppress the reverse flow of fluid from the second flow path to the first flow path.

[0029] In addition, in the electric drive valve according to the eighth mode, a filter that captures foreign matter in the fluid is provided in the seat member. Therefore, it is possible to capture foreign matter in the fluid flowing in the second flow path by the filter, and it is possible to suppress the flow of foreign matter to the downstream side of the second flow path.

[0030] In addition, since a plurality of guide portions that guide the check valve core to slide on the inner surface of the second flow path are provided on the check valve core, the check valve core can move smoothly without tilting inside the second flow path.

[0031] In addition, since the filter is disposed inside the plurality of guide portions that guide the check valve core, the filter can be compactly accommodated inside the second flow path.

[0032] Effects of the Invention

[0033] As described above, according to the electric drive valve of the present invention, it is possible to easily change the specifications and uses. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a cross-sectional view of the solenoid valve according to the first embodiment.

[0035] Figure 2 It is a cross-sectional view of the solenoid valve in the fully open state (when energized) mounted on the flow path block.

[0036] Figure 3 It is an enlarged cross-sectional view showing a part of the lower end of the seat member.

[0037] Figure 4 It is a cross-sectional view of the solenoid valve according to the second embodiment.

[0038] Figure 5 It is a cross-sectional view of the solenoid valve according to the third embodiment.

[0039] Figure 6 It is a cross-sectional view of the solenoid valve according to the fourth embodiment.

[0040] Figure 7 It is a cross-sectional view of the solenoid valve according to the fifth embodiment.

[0041] Symbol Explanation

[0042] 10 Solenoid valve (electric drive valve)

[0043] 18 Electromagnetic coil (drive unit)

[0044] 22 Attracting member (drive unit)

[0045] 24 Main spool valve (spool valve)

[0046] 26 Plunger

[0047] 28 Valve body

[0048] 28B Lower side portion (second side portion)

[0049] 30 Seat member

[0050] 32 Mounting hole

[0051] 32A Internal thread

[0052] 32B Tapered hole wall

[0053] 34 First flow path

[0054] 36 Second flow path

[0055] 38 Main valve chamber (valve chamber)

[0056] 46A Seating portion

[0057] 48 External thread

[0058] 50 Tapered portion

[0059] 54 Flange

[0060] 56 O-ring (sealing member)

[0061] 110 Solenoid valve (electric drive valve)

[0062] 210 Solenoid valve (electric drive valve)

[0063] 212 Filter

[0064] 213 seat component

[0065] 310 solenoid valve (electrically actuated valve)

[0066] 312 check valve

[0067] 314 seat component

[0068] 316C valve seat (check valve seat)

[0069] 318 check valve spool

[0070] 318B guide portion

[0071] 324 compression coil spring (spring). Detailed implementation manners

[0072] [First Embodiment]

[0073] Use Figures 1 to 3 An explanation will be given of the solenoid valve 10 according to an embodiment of the present invention.

[0074] Hereinafter, a manner for implementing the present invention will be described based on the drawings. Components denoted by the same reference numerals in the respective drawings mean the same or similar components. In addition, repeated descriptions and reference numerals may be omitted in the embodiments described below. In addition, the drawings used in the following description are all schematic drawings, and the dimensional relationships between the respective elements shown in the drawings, the ratios of the respective elements, etc. are not necessarily the same as the actual ones. In addition, even between the multiple drawings, the dimensional relationships between the respective elements, the ratios of the respective elements, etc. are not necessarily the same.

[0075] As Figure 1 shown, the solenoid valve 10 according to the present embodiment is used for, for example, a refrigeration cycle of an automotive air conditioner, and is a so-called normally closed pilot-operated solenoid valve that becomes a closed valve state when the electromagnetic coil 18 described later is not energized.

[0076] As Figure 2 shown, the solenoid valve 10 is a cartridge-type solenoid valve that is used by being installed in a solenoid valve mounting hole 17 of a flow path block 16 having an inlet 12 and an outlet 14.

[0077] In addition, the solenoid valve 10 may further include an electromagnetic coil 18 that generates a magnetic field for magnetizing the attracting member 22 and the plunger 26. In the present embodiment, the solenoid valve 10 and the electromagnetic coil 18 are separate. In addition, in the present specification, the electrically actuated valve of the present invention also includes an electrically actuated valve in which the electromagnetic coil 18 is not provided.

[0078] As Figure 1As shown, the solenoid valve 10 includes a valve block 20, an attracting member 22, a main spool 24 which is an example of the spool of the present invention, and a plunger 26.

[0079] (Valve block)

[0080] The valve block 20 has a valve body 28 and a seat member 30.

[0081] The valve body 28 is configured to be cylindrical and insertable into the flow path block 16. An installation hole 32 is formed through it in the axial direction, and a plurality of first flow paths 34 are formed in a first side portion 28S which is the outer peripheral portion.

[0082] The seat member 30 is formed to be cylindrical and insertable into the valve body 28. A second flow path 36 is formed through it in the axial direction.

[0083] The first flow path 34 opens to the outer periphery of the valve body 28 and communicates with the second flow path 36 of the seat member 30. That is, the first flow path 34 and the second flow path 36 can communicate with each other.

[0084] In the valve block 20, a main valve chamber 38 which is an example of the valve chamber of the present invention is provided between the first flow path 34 and the second flow path 36.

[0085] As Figure 2 shown, the first flow path 34 is a flow path that communicates with the inlet 12 of the flow path block 16 in the installed state on the flow path block 16, and is formed, for example, at four equally spaced positions in the circumferential direction.

[0086] An O-ring 40 for sealing the gap with the flow path block 16 is installed above the first flow path 34 on the outer periphery of the valve body 28.

[0087] The second flow path 36 communicates with the outlet 14 of the flow path block 16 when the solenoid valve 10 is installed on the flow path block 16.

[0088] As Figure 1 shown, an external thread 28A that engages with the internal thread 16A of the flow path block 16 is provided below the first flow path 34 on the outer periphery of the valve body 28.

[0089] In addition, a two-sided width 28C for engaging a jig (not shown) that rotates the valve body 28 is provided at the upper end of the outer periphery of the valve body 28.

[0090] An internal thread 44 for engaging an external thread 60A of a pipe holder 60 described later is provided on the inner periphery of the upper end portion of the valve body 28.

[0091] An internal thread 32A is formed above the installation hole 32 of the valve body 28 (on the main valve chamber 38 side), and a tapered hole wall 32B that expands downward is formed below the internal thread 32A.

[0092] At the upper end of the seat member 30, a cylindrical seat portion 46 is formed which protrudes into the interior of the main valve chamber 38 and has its top end (upper end) provided as a seating portion (valve seat) 46A.

[0093] In the seat member 30, an external thread 48 that engages with the internal thread 32A of the valve body 28 is formed on the lower side of the seat portion 46, and a conical portion 50 in the shape of a cone that abuts against the conical hole wall 32B of the mounting hole 32 formed in the valve body 28 is formed on the lower side of the external thread 48.

[0094] As Figure 3 shown, in the seat member 30, a constant diameter portion 52 having a constant diameter is formed on the lower side of the conical portion 50, and a flange 54 is formed at the lower end.

[0095] An O-ring 56, which is an example of the sealing member of the present invention, is disposed between the lower side portion (an example of the second side portion of the present invention) 28B of the valve body 28 and the flange 54 of the seat member 30. As Figure 2 shown, the O-ring 56 seals between the valve block 20 and the flow path block 16.

[0096] (Attracting member)

[0097] As Figure 1 shown, the attracting member 22 is disposed on the side opposite to the second flow path 36 in the axial direction of the main valve chamber 38 (axial direction of the valve body 28). Specifically, the attracting member 22 is a soft magnetic material such as magnetic stainless steel, and is fitted, for example, to one end side of the tube 58 (the upper end side in Figure 1 ). The other end side of the tube 58 (the lower end side in Figure 1 ) is supported by the tube holder 60.

[0098] (Tube holder)

[0099] The tube holder 60 is a member that supports the tube 58, and is provided on the side of the valve body 28 opposite to the mounting hole 32 side. An external thread 60A that engages with the internal thread 44 of the valve body 28 is provided on the outer periphery of the tube holder 60. The tube holder 60 is attached to the valve body 28 by screwing the external thread 60A with the internal thread 44.

[0100] In addition, an O-ring 63 is installed between the tube holder 60 and the valve body 28. The O-ring 63 seals between the tube holder 60 and the valve body 28.

[0101] A pilot valve chamber 64 is provided, for example, in a portion surrounded by the valve body 28, the tube holder 60, and the main valve element 24 between the main valve element 24 and the plunger 26. The pilot valve chamber 64 communicates with the main valve chamber 38 and has a pilot valve seat 62. In the pilot valve chamber 64, the plunger 26 is disposed so as to be movable in the axial direction.

[0102] Electromagnetic coil

[0103] The electromagnetic coil 18 is configured to have a winding and is arranged to be sandwiched between the upper plate 66U and the lower plate 66L of the housing 66. When an electric current flows through the winding of the electromagnetic coil 18, the attracting member 22 and the plunger 26 are magnetized.

[0104] In addition, the electromagnetic coil 18, the attracting member 22, and the plunger 26 are an example of the driving portion of the present invention for driving the main spool valve 24.

[0105] A pipe 58 is inserted through the housing 66 and the electromagnetic coil 18, and the upper plate 66U of the housing 66 is fastened to the attracting member 22 by, for example, a threaded member 68. Thus, the housing 66 and the electromagnetic coil 18 are fixed to the pipe 58. A connector 70 for supplying electric power is connected to the electromagnetic coil 18.

[0106] Main spool valve

[0107] The main spool valve 24 is a pilot-operated spool valve and forms the main valve 72 together with the seating portion 46A. The main spool valve 24 is provided in the main valve chamber 38 and moves axially to contact and separate from (abut or separate from) the seating portion 46A.

[0108] Specifically, the main spool valve 24 is arranged inside the valve body 28 and is configured to be able to slide axially relative to the inner wall of the valve body 28.

[0109] A piston ring 74 is mounted on the side wall of the main spool valve 24. Pressure equalizing holes 24A communicating with one side and the other side in the axial direction are formed in the main spool valve 24. The pressure equalizing holes 24A communicate the pilot valve chamber 64 with the main valve chamber 38.

[0110] A pilot valve seat 62 and a pilot port 76 are provided in the portion of the main spool valve 24 facing the pilot valve chamber 64. The pilot port 76 communicates the pilot valve chamber 64 with the second flow path 36 radially inside the pilot valve seat 62.

[0111] A main valve gasket 78 is mounted on the portion of the main spool valve 24 axially opposite to the seating portion 46A. When the main valve gasket 78 is in close contact with the seating portion 46A, the main valve 72 is closed. In addition, a compression spring 80 is provided between the main spool valve 24 and the valve body 28 ( Figure 1 on the lower side of the main spool valve 24). The compression spring 80 applies a force to the main spool valve 24 in a direction away from the seating portion 46A ( Figure 1 on the upper side), and it is easier to move the main spool valve 24 when the pressure difference at the time of valve opening of the plunger 26 is small.

[0112] Plunger

[0113] The plunger 26 is a component made of a soft magnetic material attracted by the magnetized attracting member 22. Specifically, the plunger 26 is disposed in the tube 58 so as to be axially slidable. A compression spring 82 is provided between the attracting member 22 and the plunger 26. The compression spring 82 biases the plunger 26 toward the main spool valve 24 side ( Figure 1 the lower side).

[0114] The plunger 26 abuts against or separates from the pilot valve seat 62 to open and close the pilot port 76. That is, the pilot valve 84 is constituted by the plunger 26 and the pilot valve seat 62.

[0115] A pilot valve gasket 86 is installed at the end of the plunger 26 on the main spool valve 24 side (at the Figure 1 lower end in this case). When the pilot valve gasket 86 is in close contact with the pilot valve seat 62, the pilot valve 84 is closed.

[0116] (Function, effect)

[0117] The present embodiment is configured as described above, and the function thereof will be described below.

[0118] The solenoid valve 10 according to the present embodiment is a so-called normally closed solenoid valve. When the electromagnetic coil 18 is not energized, as Figure 1 shown, the main valve 72 and the pilot valve 84 are closed.

[0119] When the electromagnetic coil 18 is energized to magnetize the attracting member 22, the plunger 26 is attracted by the magnetized attracting member 22 and lifted. At this time, the plunger 26 overcomes the biasing force of the compression spring 82 and is lifted, and the pilot valve gasket 86 separates from the pilot valve seat 62.

[0120] In the present embodiment, the main spool valve 24 has a pilot port 76 and a pilot valve seat 62. The plunger 26 abuts against or separates from the pilot valve seat 62 to open and close the pilot port 76, thereby operating the main spool valve 24.

[0121] Specifically, the magnetized attracting member 22 attracts the plunger 26, and the plunger 26 overcomes the biasing force of the compression spring 82 provided between the attracting member 22 and the plunger 26 and separates from the pilot valve seat 62.

[0122] At this time, the pressure in the pilot valve chamber 64 is released through the pilot port 76 to the second flow path 36 and decreases, and the pressure in the main valve chamber 38 increases compared to the pilot valve chamber 64. As a result, the main spool valve 24 separates from the seating portion 46A and opens. At this time, the biasing force of the compression spring 80 promotes the lifting of the main spool valve 24.

[0123] On the other hand, when the energization of the electromagnetic coil 18 is stopped and the attraction of the attracting member 22 to the plunger 26 ceases, due to the acting force of the compression spring 82, the plunger 26 moves in a direction away from the attracting member 22 and abuts against the seating portion 46A. As a result, the pilot port 76 is closed, so the pressure in the pilot valve chamber 64 increases and is equalized, causing the main valve element 24 to overcome the acting force of the compression spring 80 and abut against the seating portion 46A to close the valve.

[0124] In the solenoid valve 10 of the present embodiment, the seat member 30 provided separately from the valve body 28 is provided with a seat portion 46 having a seating portion 46A that contacts and separates from the main valve element 24 and a second flow path 36. Therefore, by simply replacing the seat member 30 with different diameter dimensions (valve bore diameter), height dimensions (axial dimensions) of the seat portion 46, diameter dimensions of the second flow path 36, etc., the specifications and uses (flow rate of fluid at valve opening, lift dimension, etc.) of the solenoid valve 10 can be easily changed without changing the valve body 28.

[0125] In other words, the solenoid valve 10 of the present embodiment can make the valve body 28 common, and the specifications and uses can be changed simply by replacing the seat member 30. Therefore, the specifications and uses can be easily changed with a simple structure.

[0126] It is difficult to arrange the drive portion (electromagnetic coil 18, attracting member 22, and plunger 26) that drives the main valve element 24 on the lower side portion (an example of the second side portion) 28B side of the valve body 28 without interfering with the seat member 30 and the flow path block 16. Since the seat member 30 and the flow path block 16 are not arranged on the side of the valve body 28 opposite to the lower side portion 28B side, the drive portion can be arranged without interfering with the seat member 30 and the flow path block 16.

[0127] In the solenoid valve 10 of the present embodiment, the seat member 30 is fixed to the valve body 28 by screwing the external thread 48 of the seat member 30 into the internal thread 32A of the valve body 28. Therefore, the situation where the seat member 30 detaches from the valve body 28 due to the fluid pressure can be suppressed.

[0128] In the solenoid valve 10 of the present embodiment, by screwing the external thread 48 of the seat member 30 into the internal thread 32A of the valve body 28 and making the conical tapered portion 50 formed on the outer peripheral portion of the seat member 30 closely contact the tapered hole wall 32B of the mounting hole 32 formed in the valve body 28, a large frictional force can be generated between the tapered portion 50 and the tapered hole wall 32B. Thereby, the loosening of the seat member 30 screwed into the valve body 28 can be suppressed.

[0129] In the solenoid valve 10 of the present embodiment, since the tapered hole wall 32B is formed in the mounting hole 32 of the valve body 28 and the conical portion 50 in the shape of a cone is formed in the seat member 30, when the seat member 30 is inserted into the mounting hole 32, the conical portion 50 of the seat member 30 is guided by the tapered hole wall 32B of the mounting hole 32, and the axis of the seat member 30 can be aligned with the axis of the mounting hole 32, making it easy to screw the external thread 48 of the seat member 30 with the internal thread 32A of the valve body 28.

[0130] In the solenoid valve 10 of the present embodiment, by disposing the O-ring 56 between the flange 54 of the seat member 30 and the lower side portion 28B of the valve body 28, as Figure 2 shown, when the solenoid valve 10 is inserted and mounted in the solenoid valve mounting hole 17 of the flow path block 16, the O-ring 56 can be used to seal between the valve block 20 and the flow path block 16.

[0131] In addition, in the solenoid valve 10 of the present embodiment, it is not necessary to form a groove for embedding the O-ring 56 in the seat member 30 for mounting the O-ring 56 on the valve block 20, and the machining of the seat member 30 becomes easy.

[0132] [Second Embodiment]

[0133] Use Figure 4 to describe the solenoid valve 110 according to the second embodiment of the present invention. In addition, the same reference numerals are given to the same structures as those in the first embodiment, and their descriptions are omitted.

[0134] The solenoid valve 110 of the present embodiment is a so-called normally open pilot-operated solenoid valve.

[0135] Here, Figure 4 is a view for explaining the structure of the solenoid valve 110 according to the present embodiment, and is a view showing the fully open state (when not energized).

[0136] As Figure 4 shown, in the center of the upper part of the valve body 28, the cylindrical plunger 114 for moving the pilot valve element 112 is disposed in the pipe 116 that is open downward.

[0137] The pilot valve element 112 is connected to the plunger 114 and is configured to be able to move up and down in the pipe 116 together with the plunger 114. That is, the plunger 114 slides up and down in the pipe 116 by the operation of the electromagnetic coil 18.

[0138] As a unit that drives the plunger 114 through the operation of the electromagnetic coil 18, an attracting member 118 is provided. When the electromagnetic coil 18 is energized, the attracting member 118 is magnetized, and the attracting member 118 attracts the plunger 114 downward against the elastic force of the spring 120, which is a compression coil spring disposed between the attracting member 118 and the plunger 114.

[0139] The tube 116 that houses the plunger 114 is open downward and is fixed to the attracting member 118. In addition, the attracting member 118 is supported by the tube holder 60.

[0140] In the present embodiment, the pilot valve 84 is constituted by the plunger 114 and the pilot valve seat 62.

[0141] In addition, the specifications of the seat member 30 of the present embodiment are different from those of the seat member 30 of the first embodiment. Specifically, the second flow path 36 of the seat member 30 of the present embodiment is formed to have a larger diameter than the second flow path 36 of the seat member 30 of the first embodiment. Further, the seat portion 46 of the seat member 30 of the present embodiment is formed to have a lower height than the seat portion 46 of the seat member 30 of the first embodiment.

[0142] (Function, effect)

[0143] Next, the operation of the solenoid valve 110 will be described.

[0144] As shown in the state where the electromagnetic coil 18 is not energized, Figure 4 when the electromagnetic coil 18 is not energized, no attractive force is generated in the attracting member 118. Therefore, due to the elastic force of the spring 120, the plunger 114 is lifted upward in the tube 116, and the pilot valve 84 is set to the open state. In addition, the main spool 24 is lifted upward in the main valve chamber 38 due to the elastic force of the compression spring 80, and the main valve 72 is set to the open state.

[0145] Next, when the electromagnetic coil 18 is energized in the state shown in Figure 4 , the attracting member 118 and the plunger 114 are magnetized, and an electromagnetic attractive force is generated between the two, so that the plunger 114 is pulled down against the elastic force of the spring 120.

[0146] A pilot spool 112 is integrally fixed below the plunger 114. Therefore, the pilot spool 112 moves up and down in the tube 116 in the same manner as the movement of the plunger 114.

[0147] Due to the attractive force of the attracting member 118, the plunger 114 is pulled downward. At the same time, the pilot spool 112 also moves downward. As a result, the pilot valve gasket 86 provided below the pilot spool 112 abuts against the pilot valve seat 62 formed on the upper side of the main spool 24, and the pilot valve 84 is set to the closed state (i.e., the pilot port 76 is closed).

[0148] When the pilot port 76 is closed, the only path connecting the pilot valve chamber 64 and the main valve chamber 38 is the pressure equalizing hole 24A, and the pressure difference between the two valve chambers disappears. Further, when the plunger 114 presses the main spool 24 downward and slides to its lowest point, the main valve gasket 78 formed on the lower side of the main spool 24 abuts against the seating portion 46A, and the main valve 72 is set to the closed state.

[0149] As a result, the flow path of the fluid such as the refrigerant is closed, and the flow from the first flow path 34 to the second flow path 36 is blocked.

[0150] Next, when the power supply to the electromagnetic coil 18 is stopped, the electromagnetic attractive force of the electromagnetic coil 18 on the attracting member 118 disappears, and the plunger 114 is pushed upward by the elastic force of the spring 120. The pilot spool 112 moves upward together with the plunger 114, so that the pilot valve gasket 86 separates from the pilot valve seat 62 provided on the upper surface side of the main spool 24, and the pilot valve 84 becomes the open state.

[0151] As a result, the pilot valve chamber 64 communicates with the second flow path 36 via the pilot port 76 provided in the central portion of the main spool 24, and the pressure in the pilot valve chamber 64 transfers from high pressure to low pressure.

[0152] As a result, the main spool 24 moves upward, so that the main valve gasket 78 fixed to the lower surface side of the main spool 24 separates from the seating portion 46A, and the main valve 72 becomes the open valve state.

[0153] Similar to the solenoid valve 10 of the first embodiment, the solenoid valve 110 of the present embodiment is provided with a seat portion 46 having a seating portion 46A that contacts and separates from the main spool 24 and the second flow path 36 on the seat member 30 that is separated from the valve body 28. Therefore, by simply replacing the seat member 30 with a different specification, the specification and use of the solenoid valve 10 can be easily changed without changing the valve body 28.

[0154] In addition, other effects are the same as those of the first embodiment.

[0155] [Third Embodiment]

[0156] Use Figure 5 The solenoid valve 210 according to the second embodiment of the present invention will be described. In addition, the same reference numerals are given to the same structures as those in the first embodiment, and their descriptions are omitted.

[0157] The solenoid valve 210 of this embodiment is a modified example of the solenoid valve 10 of the first embodiment, and is a so-called normally-closed pilot-operated solenoid valve.

[0158] As Figure 5 shown, in the solenoid valve 210 of this embodiment, a seat member 213 with a filter 212 installed in the second flow path 36 is used.

[0159] The filter 212 includes a cup-shaped net member 214, and the opening edge portion of the net member 214 is fixed to the rings 216 and 218 in a state of being clamped by the rings 216 and 218.

[0160] A stepped portion 36A protruding radially inward is formed in the axial middle portion of the second flow path 36. The filter 212 is inserted and fixed into the inside of the second flow path 36 from the upper side of the second flow path 36 in such a manner that the ring 216 abuts against and is hooked on the stepped portion 36A.

[0161] In the solenoid valve 210 of this embodiment, foreign matters in the fluid flowing from the first flow path 34 to the second flow path 36 can be captured by the net member 214, and the situation where foreign matters flow to the downstream side of the second flow path 36 can be suppressed.

[0162] In addition, other functions and effects are the same as those of the first embodiment. In this embodiment, although the net member 214 of the filter 212 is provided in a cup shape, it may also be other shapes.

[0163] [Fourth Embodiment]

[0164] Use Figure 6 to describe the solenoid valve 310 according to the third embodiment of the present invention. In addition, the same reference numerals are given to the same structures as those in the first embodiment, and their descriptions are omitted.

[0165] The solenoid valve 310 of this embodiment is a modified example of the solenoid valve 10 of the first embodiment. As Figure 6 shown, a seat member 314 with a check valve 312 built therein is installed on the valve body 28.

[0166] The seat member 314 is formed in a cylindrical shape in which a part can be inserted into the valve body 28, and a stepped second flow path 316 is formed therethrough in the axial direction.

[0167] In the second flow path 316, the side of the seating portion 46A is provided as a small-diameter portion 316A, the lower side of the small-diameter portion 316A is provided as a first medium-diameter portion 316B, the lower side of the medium-diameter portion 316B is provided as a valve seat 316C which is formed in a conical shape (chamfered shape) as an example of the check valve seat of the present invention, the lower side of the valve seat 316C is provided as a large-diameter portion 316D, and the lower side of the large-diameter portion 316D is provided as a second medium-diameter portion 316E.

[0168] A check valve core 318 is inserted into the second flow path 316. The check valve core 318 has a flange 318A at the middle part in the length direction, and an O-ring 320 is installed on the outer peripheral part of the flange 318A.

[0169] A plurality of guide portions 318B are formed on the upper portion of the flange 318A. The plurality of guide portions 318B are used to slide on the inner peripheral surface of the first middle diameter portion 316B to axially guide the check valve core 318.

[0170] A disc-shaped spring seat 321 having a plurality of holes (not shown) is fixed to the second middle diameter portion 316E by a snap ring 322.

[0171] A compression coil spring 324, which is an example of the spring of the present invention, is provided between the spring seat 321 and the flange 318A of the check valve core 318.

[0172] A guide pillar 318C is formed on the lower portion of the flange 318A. The guide pillar 318C is inserted into the inside of the compression coil spring 324 to guide the compression coil spring 324.

[0173] The check valve core 318 is urged upward by the compression coil spring 324, and the O-ring 320 of the check valve core 318 is pressed against the valve seat 316C of the second flow path 316.

[0174] The check valve 312 of the present embodiment is constituted by the check valve core 318 and the valve seat 316C.

[0175] When the fluid moves from the first flow path 34 side to the second flow path 36 side, the check valve core 318 moves toward the downstream side of the second flow path 36 against the acting force of the compression coil spring 324, so that the O-ring 320 separates from the valve seat 316C, and the fluid flows toward the downstream side of the second flow path 36.

[0176] On the other hand, when the valve is closed and the pressure on the second flow path 36 side is higher than the pressure on the first flow path 34 side, the O-ring 320 of the check valve core 318 is pressed against the valve seat 316C, preventing the fluid from moving from the second flow path 36 side to the first flow path 34 side, and the backflow of the fluid to the upstream side of the solenoid valve can be suppressed.

[0177] In addition, since the check valve 312 is disposed on the downstream side of the fluid flow compared to the seating portion 46A that abuts against the main valve gasket 78 of the main valve core 24, even if the pressure on the second flow path 36 side increases, the pressure acting on the main valve core 24 can be suppressed, and the opening of the solenoid valve 310 in the closed valve state can be suppressed.

[0178] In the solenoid valve 310 of the present embodiment, a check valve 312 for suppressing backflow is built into the seat member 314. Therefore, compared with the case where a check valve is provided outside the solenoid valve, no space is required outside the solenoid valve, and the entire flow path system can be made compact. In addition, there is no need to provide a check valve in the flow path block 16, and the structure of the flow path block 16 to which the solenoid valve 310 is mounted is not complicated.

[0179] In addition, other functions and effects are the same as those of the first embodiment.

[0180] [Fifth Embodiment]

[0181] Use Figure 7 The solenoid valve 410 according to the fifth embodiment of the present invention will be described. In addition, the same reference numerals are given to the same structures as those in the above-described embodiments, and the description thereof is omitted.

[0182] As Figure 7 shown, the solenoid valve 410 of the present embodiment includes both the filter 212 of the third embodiment and the check valve 312 of the fourth embodiment.

[0183] In the solenoid valve 410 of the present embodiment, since the filter 212 is disposed inside the plurality of guide portions that guide the check valve core, the filter 212 can be compactly accommodated inside the second flow path 36.

[0184] In addition, other functions and effects are the same as those of the solenoid valve 210 of the third embodiment and the solenoid valve 310 of the fourth embodiment.

[0185] [Other Embodiments]

[0186] The above describes an example of the embodiment of the present invention, but the embodiment of the present invention is not limited to the above. Of course, various modifications can be made without departing from the gist thereof.

[0187] In the solenoid valve 10 of the first embodiment, the seat member 30 is fixed to the valve body 28 by screwing the external thread 48 of the seat member 30 into the internal thread 32A of the valve body 28. However, the present invention is not limited thereto. For example, the seat member 30 can also be fixed to the valve body 28 using screws (threaded members).

[0188] In the third to fifth embodiments, normally closed solenoid valves are described, but the third to fifth embodiments can also be made into normally open solenoid valves as in the second embodiment.

[0189] The solenoid valves of the first to fifth embodiments are so-called pilot-operated solenoid valves, but they can also be made into ordinary direct-acting solenoid valves.

[0190] The solenoid valves of the first to fifth embodiments are configured to drive the main spool valve 24 by a driving unit using magnetic force, which is composed of a plunger, an attracting member, an electromagnetic coil, etc., but it may also be configured as a so-called electric valve that drives the main spool valve 24 by a driving device such as a motor. Especially in the case of an electric valve, it can be used in a circuit (a so-called reverse flow circuit) that flows in from the seat member 30 side.

[0191] In the solenoid valve 410 according to the fifth embodiment, the filter 212 is disposed inside the plurality of guide portions 318B that guide the check valve spool 318, but the filter 212 may also be disposed at a position away from the guide portions 318B.

[0192] In addition, in the above-described embodiment, the fluid flows into the solenoid valve from the first flow path 34 and flows out from the second flow path 36. However, depending on the situation, the fluid may also flow in from the second flow path 36 and flow out from the first flow path 34.

Claims

1. An electrically driven valve, characterized in that: have: Valve core; a valve body, the valve body having a valve chamber, a first flow path, and a mounting hole, the valve chamber allowing the valve core to move along a direction, the first flow path opening at a first side portion located in a direction intersecting the one direction and communicating with the valve chamber, and the mounting hole opening at a second side portion located at a side of the one direction relative to the valve chamber and communicating with the valve chamber; and A seat component is installed on the second side of the valve body in a state where a part of the seat component is inserted into the mounting hole, and a second flow path is provided which is connected to the valve chamber and is open at the end on the side opposite to the valve chamber side, and a seat portion is provided on the valve chamber side of the second flow path, and the valve core contacts and separates from the seat portion as it moves in the one direction.

2. The electrically driven valve according to claim 1, characterized in that: A driving portion that drives the valve element is provided on a side of the valve body opposite to the second side portion.

3. The electrically driven valve according to claim 1 or 2, characterized in that: An external thread is formed on the outer periphery of the seat member. The mounting hole of the valve body is formed with an internal thread into which the external thread is screwed. The seat member is fixed to the valve body by screwing the external thread into the internal thread.

4. The electrically driven valve according to claim 3, characterized in that: A conical tapered portion is formed on the outer periphery of the seat member. The mounting hole of the valve body is formed with a tapered hole wall that is in close contact with the tapered portion.

5. The electrically driven valve according to claim 4, characterized in that: The seat member has a flange formed on a side opposite to the seat portion. A sealing member is arranged between the flange and the second side portion of the valve body.

6. The electrically driven valve according to claim 1, characterized in that: The seat member is provided with a check valve that allows the fluid to move from the first flow path side to the second flow path side and prevents the fluid from moving from the second flow path side to the first flow path side.

7. The electrically driven valve according to claim 1, characterized in that: The second flow path is provided with a filter for capturing foreign matter in the fluid.

8. The electrically driven valve according to claim 1, characterized in that: The seat component is provided with a check valve, which is composed of: a check valve core, which is movably arranged in the second flow path; a check valve seat, on which the check valve core abuts; a spring, which applies force to the check valve core toward the check valve seat; and a plurality of guide parts, which guide the check valve core to make the check valve core slide on the inner surface of the second flow path, and the check valve allows the fluid to move from the first flow path side to the second flow path side, and prevents the fluid from moving from the second flow path side to the first flow path side. The second flow path is provided with a filter that is disposed inside the plurality of guide portions and captures foreign matter in the fluid.

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