Electric drive valve

Abstract

To provide an electric drive valve that can easily change specifications and uses.SOLUTION: An electric drive valve comprises: a valve body; a valve main body which has a valve chamber where the valve body moves in one direction, a first flow passage that is open to a first side part located in a direction crossing the one direction to communicate with the valve chamber, and a fitting hole that is open to a second side part located on one side in the one direction to the valve chamber to communicate with the valve chamber; and a sheet member which is fitted on a second side part side that is a side where the fitting hole is formed based on the valve chamber of the valve main body while partially inserted into the fitting hole, is provided with a second flow passage that communicates with the valve chamber and is open to an end part on the opposite side from the valve chamber side, and is further provided with a seating part that is provided on the valve chamber side of the second flow passage, and with / from which the valve body gets into contact and separates according to the movement in the one direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an electric drive valve.

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The electric drive valve of Patent Document 1 is a so-called cartridge type solenoid valve, which is attached to and used in a flow path block having a plurality of flow paths. This type of cartridge type solenoid valve includes a valve body having a valve seat that abuts against a main valve body. However, according to specifications such as flow rate and operability and applications, it is necessary to prepare a plurality of valve bodies with different valve diameters and structures of the seating portions where the main valve body contacts, and there is room for improvement.

[0005] In consideration of the above facts, the present disclosure aims to provide an electric drive valve whose specifications and applications can be easily changed.

Means for Solving the Problems

[0006] The electric drive valve according to the first aspect includes a valve body, a valve chamber in which the valve body moves along one direction, a first flow path that opens to a first side portion located in a direction intersecting the one direction and communicates with the valve chamber, and a mounting hole that opens to a second side portion located on one side of the one direction with respect to the valve chamber and communicates with the valve chamber. A valve body, and a seat member that is attached to the second side portion side of the valve body with a part thereof inserted into the mounting hole, is provided with a second flow path that communicates with the valve chamber and opens at an end opposite to the valve chamber side, and a seating portion that comes into contact with and separates from the valve body as the valve body moves in the one direction is provided on the valve chamber side of the second flow path.

[0007] In the electric drive valve according to the first aspect, the valve can be closed by moving the valve body in the valve chamber and bringing it into contact with the seating portion of the seat member, and the valve can be opened by separating the valve body from the seating portion.

[0008] In the electric drive valve according to the first aspect, since the seat member, which is separate from the valve body, is provided with a seating portion with which the valve body comes into contact and separates, and a second flow path, by simply replacing the seat member with different dimensions and shapes of the seating portion and the second flow path, the specifications and applications of the electric drive valve can be changed without changing the valve body. In other words, the electric drive valve according to the first aspect can share the valve body among valves with different specifications and applications, and the change of specifications and applications only requires replacing the seat member, so the specifications and applications can be easily changed.

[0009] The electric drive valve according to the second aspect is the electric drive valve according to the first aspect, wherein the drive unit for driving the valve body is provided on the side opposite to the second side portion side of the valve body.

[0010] In the electric drive valve according to the second aspect, the valve body can be driven using the drive unit. Since the seat member is not arranged on the side opposite to the second side portion side of the valve body, the drive unit can be easily arranged without interfering with the seat member.

[0011] The electric drive valve according to the third aspect is the electric drive valve according to the first aspect or the second aspect, wherein a male screw is formed on the outer peripheral portion of the seat member, and a female screw into which the male screw is screwed is formed in the mounting hole of the valve body. The seat member is fixed to the valve body by screwing the male screw into the female screw.

[0012] In the electric drive valve according to the third aspect, since the seat member is fixed to the valve body by screwing the male screw of the seat member into the female screw of the valve body, it is possible to prevent the seat member from coming off the valve body due to the fluid pressure.

[0013] The electric drive valve according to the fourth aspect is the electric drive valve according to the third aspect, wherein a conical taper portion is formed on the outer peripheral portion of the seat member, and a taper hole wall that is in close contact with the taper portion is formed in the mounting hole of the valve body.

[0014] In the electric drive valve according to the fourth aspect, by screwing the male screw of the seat member into the female screw of the valve body and bringing the conical taper portion formed on the outer peripheral portion of the seat member into close contact with the taper hole wall formed in the mounting hole of the valve body, a large frictional force can be generated between the taper portion and the taper hole wall, and loosening of the seat member screwed into the valve body can be suppressed.

[0015] Further, since the taper hole wall is formed in the mounting hole and the conical taper portion is formed on the seat member, when the seat member is inserted into the mounting hole, the taper portion of the seat member is guided by the taper hole wall of the mounting hole, and the axis of the seat member and the axis of the mounting hole can be aligned, making it easier to screw the male screw of the seat member into the female screw of the valve body.

[0016] The electric drive valve according to the fifth aspect is the electric drive valve according to any one of the first aspect to the fourth aspect, wherein a flange is formed on the seat member on the side opposite to the seating portion side, and a seal member is disposed between the flange and the second side portion of the valve body.

[0017] In the electric drive valve according to the fifth aspect, by disposing a seal 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 into and attached to the hole of the flow path block, the space between the valve body and the flow path block can be sealed by the seal member. Further, in the electric drive valve according to the fifth aspect, there is no need to form a groove in the seat member for fitting the seal member in order to dispose the seal member.

[0018] The electric drive valve according to the sixth aspect is the electric drive valve according to any one of the first to fifth aspects, wherein 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 blocks the movement of the fluid from the second flow path side to the first flow path side.

[0019] In the electric drive valve according to the sixth aspect, since 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 blocks the movement of the fluid from the second flow path side to the first flow path side, for example, when the pressure on the second flow path side becomes higher than the pressure on the first flow path side, the reverse flow of the fluid from the second flow path to the first flow path can be suppressed.

[0020] The electric drive valve according to the seventh aspect is the electric drive valve according to any one of the first to sixth aspects, wherein the second flow path is provided with a strainer for capturing foreign matter in the fluid.

[0021] In the electric drive valve according to the seventh aspect, the foreign matter in the fluid flowing through the second flow path can be captured by the strainer. The flow of foreign matter to the downstream side of the second flow path can be suppressed.

[0022] The electric drive valve according to the eighth aspect is the electric drive valve according to any one of the first to fifth aspects, wherein the seat member includes a check valve body movably disposed in the second flow path, a check valve seat against which the check valve body abuts, a spring that biases the check valve body toward the check valve seat, and a plurality of guide portions that slide and guide the check valve body on the inner surface of the second flow path. A check valve is provided that allows fluid to move from the first flow path side to the second flow path side and blocks the movement of the fluid from the second flow path side to the first flow path side. The second flow path is provided with a strainer disposed inside the plurality of guide portions to capture foreign matter in the fluid.

[0023] In the electric drive valve according to the eighth aspect, the seat member is provided with a check valve that allows fluid to move from the first flow path side to the second flow path side and blocks the movement of the fluid from the second flow path side to the first flow path side. Therefore, for example, when the pressure on the second flow path side becomes higher than the pressure on the first flow path side, it is possible to suppress the reverse flow of the fluid from the second flow path to the first flow path.

[0024] Further, in the electric drive valve according to the eighth aspect, the seat member is provided with a strainer that captures foreign matter in the fluid. Therefore, foreign matter in the fluid flowing through the second flow path can be captured by the strainer, and the flow of foreign matter to the downstream side of the second flow path can be suppressed.

[0025] Note that since the check valve body is provided with a plurality of guide portions that slide and guide the check valve body on the inner surface of the second flow path, the check valve body can be smoothly moved without tilting inside the second flow path.

[0026] Further, since the strainer is disposed inside the plurality of guide portions that guide the check valve body, the strainer can be compactly accommodated inside the second flow path.

Advantages of the Invention

[0027] As described above, according to the electric drive valve of the present disclosure, the specifications and applications can be easily changed.

Brief Description of the Drawings

[0028]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0029] [First Embodiment] The solenoid valve 10 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 to 3. Hereinafter, embodiments for carrying out the present disclosure will be described with reference to the drawings. Components denoted by the same reference numerals in each drawing mean the same or similar components. In the embodiments described below, redundant descriptions and reference numerals may be omitted. Also, the drawings used in the following description are all schematic, and the dimensional relationships between the elements shown in the drawings, the ratios of the elements, etc. do not necessarily match the actual ones. Also, the dimensional relationships between the elements and the ratios of the elements do not necessarily match even between multiple drawings.

[0030] As shown in FIG. 1, the solenoid valve 10 according to the present embodiment is, for example, used in a refrigeration cycle of an automotive air conditioner, etc., and is a so-called normally closed type pilot solenoid valve that is in a closed valve state when the solenoid coil 18 described later is not energized.

[0031] As shown in Fig. 2, the solenoid valve 10 is a cartridge-type solenoid valve that is attached to the solenoid valve mounting hole 17 of the flow path block 16 having an inlet 12 and an outlet 14 and used. The solenoid valve 10 may further include an electromagnet coil 18 that generates a magnetic field for magnetizing the armature 22 and the plunger 26. In the present embodiment, the solenoid valve 10 and the electromagnet coil 18 are separate bodies. In this specification, as the electric drive valve of the present disclosure, those not provided with the electromagnet coil 18 are also included.

[0032] As shown in Fig. 1, the solenoid valve 10 has a valve block 20, an armature 22, a main valve body 24 as an example of the valve body of the present disclosure, and a plunger 26.

[0033] (Valve block) The valve block 20 has a valve body 28 and a seat member 30. The valve body 28 is configured in a cylindrical shape that can be inserted into the flow path block 16. An attachment hole 32 is formed through in the axial direction, and a plurality of first flow paths 34 are formed in the first side portion 28S which is the outer peripheral portion.

[0034] The seat member 30 is formed in a cylindrical shape that can be inserted into the valve body 28, and a second flow path 36 is formed through in the axial direction. 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 are made to be communicable with each other. In the valve block 20, a main valve chamber 38 as an example of the valve chamber of the present disclosure is provided between the first flow path 34 and the second flow path 36.

[0035] As shown in Fig. 2, the first flow path 34 is a flow path that communicates with the inlet 12 of the flow path block 16 in the attached state to the flow path block 16, and is formed, for example, at 4 locations evenly in the circumferential direction.

[0036] An O-ring 40 for sealing the gap between the upper side of the first flow path 34 and the flow path block 16 is attached to the outer periphery of the valve body 28.

[0037] The second flow path 36 is configured to communicate with the outlet 14 of the flow path block 16 in a state where the solenoid valve 10 is attached to the flow path block 16.

[0038] As shown in FIG. 1, on the outer periphery of the valve body 28, below the first flow path 34, a male screw 28A that engages with the female screw 16A of the flow path block 16 is provided.

[0039] Also, at the upper end of the outer periphery of the valve body 28, a double-sided width 28C for engaging a jig (not shown) for rotating the valve body 28 is provided.

[0040] On the inner periphery of the upper end portion of the valve body 28, a female screw 44 that engages with the male screw 60A of a pipe holder 60 described later is provided.

[0041] In the mounting hole 32 of the valve body 28, a female screw 32A is formed on the upper side (main valve chamber 38 side), and below the female screw 32A, a tapered hole wall 32B that expands in diameter downward is formed.

[0042] At the upper end of the seat member 30, a cylindrical seat portion 46 that protrudes into the main valve chamber 38 and has a tip (upper end) as a seating portion (valve seat) 46A is formed.

[0043] On the seat member 30, below the seat portion 46, a male screw 48 that engages with the female screw 32A of the valve body 28 is formed, and below the male screw 48, a conical tapered portion 50 that is in close contact with the tapered hole wall 32B formed in the mounting hole 32 of the valve body 28 is formed.

[0044] As shown in FIG. 3, on the seat member 30, below the tapered portion 50, a constant diameter portion 52 having a constant diameter is formed, and a flange 54 is formed at the lower end.

[0045] Between the lower part of the valve body 28 (an example of the second side part of the present disclosure) 28B and the flange 54 of the sheet member 30, an O-ring 56 as an example of the seal member of the present disclosure is disposed. As shown in FIG. 2, the O-ring 56 seals between the valve block 20 and the flow path block 16.

[0046] (Suction device) As shown in FIG. 1, the suction device 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 suction device 22 is a soft magnetic material such as magnetic stainless steel, and is fitted, for example, to one end side (upper end side in FIG. 1) of the pipe 58. The other end side (lower end side in FIG. 1) of the pipe 58 is supported by the pipe holder 60.

[0047] (Pipe holder) The pipe holder 60 is a member that supports the pipe 58, and is provided on the side opposite to the attachment hole 32 side of the valve body 28. On the outer periphery of the pipe holder 60, an external thread 60A that engages with the internal thread 44 of the valve body 28 is provided. By screwing the external thread 60A and the internal thread 44 together, the pipe holder 60 is attached to the valve body 28.

[0048] Also, an O-ring 63 is attached between the pipe holder 60 and the valve body 28. The O-ring 63 seals between the pipe holder 60 and the valve body 28.

[0049] Between the main valve body 24 and the plunger 26, for example, in a portion surrounded by the valve body 28, the pipe holder 60, and the main valve body 24, a pilot valve chamber 64 that communicates with the main valve chamber 38 and has a pilot valve seat 62 is provided. In the pilot valve chamber 64, the plunger 26 is disposed so as to be movable in the axial direction.

[0050] (Electromagnetic coil) The electromagnetic coil 18 is configured to have windings, and is disposed so as to be sandwiched between the upper plate 66U and the lower plate 66L of the housing 66. The electromagnetic coil 18 magnetizes the suction device 22 and the plunger 26 when an electric current flows through the windings. Note that the electromagnetic coil 18, the attractor 22, and the plunger 26 are an example of the drive unit of the present disclosure that drives the main valve body 24.

[0051] A pipe 58 is passed through the housing 66 and the electromagnetic coil 18, and the upper plate 66U of the housing 66 is fastened to the attractor 22 by, for example, a screw 68. Thereby, the housing 66 and the electromagnetic coil 18 are fixed to the pipe 58. A connector 70 for power supply is connected to the electromagnetic coil 18.

[0052] (Main valve body) The main valve body 24 is a pilot-type valve body and constitutes the main valve 72 together with the seating portion 46A. This main valve body 24 is provided in the main valve chamber 38 and moves in the axial direction to contact and separate (contact or separate) from the seating portion 46A. Specifically, the main valve body 24 is disposed inside the valve body main body 28 and is axially slidable with respect to the inner wall of the valve body main body 28.

[0053] A piston ring 74 is attached to the side wall of the main valve body 24. The main valve body 24 is formed with pressure equalizing holes 24A that communicate with one side and the other side in the axial direction. The pressure equalizing holes 24A communicate the pilot valve chamber 64 and the main valve chamber 38.

[0054] A pilot valve seat 62 and a pilot port 76 are provided in a portion of the main valve body 24 facing the pilot valve chamber 64. The pilot port 76 communicates the pilot valve chamber 64 and the second flow path 36 inside the radial direction of the pilot valve seat 62.

[0055] A main valve packing 78 is attached to a portion of the main valve body 24 that axially faces the seating portion 46A. When the main valve packing 78 is in close contact with the seating portion 46A, the main valve 72 is closed. Further, a compression spring 80 is provided between the main valve body 24 and the valve body main body 28 (below the main valve body 24 in FIG. 1). The compression spring 80 biases the main valve body 24 in a direction away from the seating portion 46A (the upper side in FIG. 1), making it easier for the main valve body 24 to move when the differential pressure during opening of the plunger 26 is small.

[0056] (Plunger) The plunger 26 is a soft magnetic member attracted by the magnetized attractor 22. Specifically, the plunger 26 is disposed axially slidably within the pipe 58. A compression spring 82 is provided between the attractor 22 and the plunger 26. The compression spring 82 biases the plunger 26 toward the main valve body 24 side (the lower side in FIG. 1).

[0057] The plunger 26 abuts 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.

[0058] A pilot valve packing 86 is attached to the end of the plunger 26 on the main valve body 24 side (the lower end in FIG. 1). When the pilot valve packing 86 is in close contact with the pilot valve seat 62, the pilot valve 84 is closed.

[0059] (Function, Effect) This embodiment is configured as described above, and its operation will be described below. The solenoid valve 10 according to this embodiment is a so-called normally closed type solenoid valve. When no current is applied to the electromagnetic coil 18, as shown in FIG. 1, the main valve 72 and the pilot valve 84 are closed.

[0060] When current is applied to the electromagnetic coil 18 to magnetize the attractor 22, the plunger 26 is attracted and lifted by the magnetized attractor 22. At this time, the plunger 26 lifts against the biasing force of the compression spring 82, and the pilot valve packing 86 separates from the pilot valve seat 62.

[0061] In this embodiment, the main valve body 24 has the pilot port 76 and the pilot valve seat 62, and the plunger 26 abuts or separates from the pilot valve seat 62 to open and close the pilot port 76, thereby operating the main valve body 24.

[0062] Specifically, the plunger 26 is attracted by the magnetized attractor 22, and the plunger 26 separates from the pilot valve seat 62 against the biasing force of the compression spring 82 provided between the attractor 22 and the plunger 26.

[0063] At this time, the pressure in the pilot valve chamber 64 decreases as it escapes to the second flow path 36 through the pilot port 76, and the pressure in the main valve chamber 38 increases compared to the pilot valve chamber 64. As a result, the main valve body 24 separates from the seating portion 46A and opens. At this time, the biasing force of the compression spring 80 promotes the lift of the main valve body 24.

[0064] On the other hand, when the energization of the electromagnetic coil 18 is stopped and the attraction of the plunger 26 by the attractor 22 ceases, the plunger 26 moves in a direction away from the attractor 22 due to the biasing force of the compression spring 82, and the plunger 26 abuts against the seating portion 46A. As a result, the pilot port 76 is blocked, so the pressure in the pilot valve chamber 64 increases and equalizes, and the main valve body 24 abuts against the seating portion 46A against the biasing force of the compression spring 80 to close the valve.

[0065] In the solenoid valve 10 of the present embodiment, the seat member 30, which is separate from the valve body 28, is provided with the seat portion 46 having the seating portion 46A where the main valve body 24 comes into contact with and separates from, and the second flow path 36. Therefore, by simply replacing the seat member 30 with different diameter dimensions (valve bore diameter) of the seating portion 46A, height dimensions (axial dimensions) of the seat portion 46, diameter dimensions of the second flow path 36, etc., the specifications and applications (fluid flow rate at valve opening, lift dimension, etc.) of the solenoid valve 10 can be easily changed without changing the valve body 28.

[0066] In other words, the solenoid valve 10 of the present embodiment can share the valve body 28, and changes in specifications and applications only require replacing the seat member 30. Therefore, with a simple configuration, the specifications and applications can be easily changed.

[0067] The drive unit (electromagnetic coil 18, attractor 22, and plunger 26) that drives the main valve body 24 is difficult to be provided 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 or the flow path block 16. Since the seat member 30 and the flow path block 16 are not arranged on the side opposite to the lower side portion 28B side of the valve body 28, the drive unit can be arranged without interfering with the seat member 30 or the flow path block 16.

[0068] In the solenoid valve 10 of the present embodiment, since the male screw 48 of the seat member 30 is screwed into the female screw 32A of the valve body 28 and fixed to the valve body 28, it is possible to prevent the seat member 30 from coming off the valve body 28 due to the fluid pressure.

[0069] In the solenoid valve 10 of the present embodiment, the male screw 48 of the seat member 30 is screwed into the female screw 32A of the valve body 28, and the conical taper portion 50 formed on the outer peripheral portion of the seat member 30 is brought into close contact with the tapered hole wall 32B formed in the mounting hole 32 of the valve body 28, so that a large frictional force can be generated between the taper portion 50 and the tapered hole wall 32B. Thereby, loosening of the seat member 30 screwed into the valve body 28 can be suppressed.

[0070] 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 taper portion 50 is formed on the seat member 30, when the seat member 30 is inserted into the mounting hole 32, the taper 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 and the axis of the mounting hole 32 can be made to coincide, making it easier to screw the male screw 48 of the seat member 30 into the female screw 32A of the valve body 28.

[0071] In the solenoid valve 10 of the present embodiment, by arranging 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 shown in FIG. 2, when the solenoid valve 10 is inserted and attached to the solenoid valve mounting hole 17 of the flow path block 16, the space between the valve block 20 and the flow path block 16 can be sealed by the O-ring 56.

[0072] Also, in the solenoid valve 10 of the present embodiment, when attaching the O-ring 56 to the valve block 20, it is not necessary to form a groove in the sheet member 30 for fitting the O-ring 56, which facilitates the cutting process of the sheet member 30.

[0073] [Second Embodiment] The solenoid valve 110 according to the second embodiment of the present disclosure will be described with reference to FIG. 4. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. The solenoid valve 110 of the present embodiment is a so-called normally open type pilot solenoid valve. Here, FIG. 4 is a diagram for explaining the configuration of the solenoid valve 110 according to the present embodiment, and shows the fully open state (when not energized).

[0074] As shown in FIG. 4, at the upper center of the valve body 28, a cylindrical plunger 114 for moving the pilot valve body 112 is disposed within a pipe 116 that is open downward.

[0075] The pilot valve body 112 is connected to the plunger 114 and is configured to be movable up and down within the pipe 116 together with the plunger 114. That is, the plunger 114 slides up and down within the pipe 116 by the operation of the electromagnetic coil 18.

[0076] As a means for driving the plunger 114 by the operation of the electromagnetic coil 18, an attractor 118 is provided. The attractor 118 is magnetized when energized by the electromagnetic coil 18, and overcomes the elastic force of the spring 120, which is a compression coil spring disposed between the attractor 118 and the plunger 114, to attract the plunger 114 downward.

[0077] The pipe 116 that houses the plunger 114 is open downward and is fixed to the attractor 118. Note that the attractor 118 is supported by the pipe holder 60.

[0078] In this embodiment, the pilot valve 84 is configured using the plunger 114 and the pilot valve seat 62.

[0079] Note that the seat member 30 of this embodiment has different specifications from the seat member 30 of the first embodiment. Specifically, the second flow path 36 of the seat member 30 of this embodiment is formed to have a larger diameter than the second flow path 36 of the seat member 30 of the first embodiment. Also, the seat portion 46 of the seat member 30 of this embodiment is formed to be lower in height than the seat portion 46 of the seat member 30 of the first embodiment.

[0080] (Function, Effect) Next, the operation of the solenoid valve 110 will be described. As shown in FIG. 4 showing a state where the electromagnetic coil 18 is not energized, when the electromagnetic coil 18 is not energized, no attractive force is generated on the armature 118. Therefore, due to the elastic force of the spring 120, the plunger 114 is lifted upward in the pipe 116, and the pilot valve 84 is in an open state. Also, the main valve body 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 in an open state.

[0081] Next, when the electromagnetic coil 18 is energized in the state shown in FIG. 4, the armature 118 and the plunger 114 are magnetized, and an electromagnetic attractive force is generated between the two, causing the plunger 114 to be pulled down against the elastic force of the spring 120.

[0082] Since the pilot valve body 112 is integrally fixed to the lower part of the plunger 114, the pilot valve body 112 moves up and down in the pipe 116 in the same manner as the movement of the plunger 114.

[0083] Due to the attractive force of the armature 118, the plunger 114 is pulled down, and together with it, the pilot valve body 112 also moves downward. As a result, the pilot valve packing 86 provided below the pilot valve body 112 abuts against the pilot valve seat 62 formed on the upper side of the main valve body 24, closing the pilot valve 84 (that is, closing the pilot port 76).

[0084] When the pilot port 76 is blocked, the passage communicating the pilot valve chamber 64 and the main valve chamber 38 becomes only the pressure equalizing hole 24A, and the pressure difference between the two valve chambers disappears. Further, when the plunger 114 pushes down the main valve body 24 downward and slides to its lowest point, the main valve packing 78 formed on the lower side of the main valve body 24 abuts against the seating portion 46A to close the main valve 72. As a result, the fluid such as refrigerant has its flow path closed and the flow from the first flow path 34 to the second flow path 36 is blocked.

[0085] Next, when the energization of the electromagnetic coil 18 is stopped, the electromagnetic attraction force of the attractor 118 by the electromagnetic coil 18 disappears, and the plunger 114 is pushed upward by the elastic force of the spring 120. The pilot valve body 112 moves upward together with the plunger 114, and the pilot valve packing 86 separates from the pilot valve seat 62 provided on the upper surface side of the main valve body 24, and the pilot valve 84 becomes open.

[0086] As a result, the pilot valve chamber 64 is communicated with the second flow path 36 through the pilot port 76 provided in the central portion of the main valve body 24, and the pressure in the pilot valve chamber 64 shifts from high pressure to low pressure.

[0087] As a result, the main valve body 24 moves upward, the main valve packing 78 fixed to the lower surface side of the main valve body 24 separates from the seating portion 46A, and the main valve 72 becomes open.

[0088] Similar to the solenoid valve 10 of the first embodiment, the solenoid valve 110 of the present embodiment has a seat portion 46 having a seating portion 46A with which the main valve body 24 comes into contact and separates, and a second flow path 36 provided on a seat member 30 that is separate from the valve body 28. Therefore, by simply replacing the seat member 30 with different specifications, the specifications and applications of the solenoid valve 10 can be easily changed without changing the valve body 28. Note that other effects are the same as those of the first embodiment.

[0089] [Third Embodiment] Using FIG. 5, the solenoid valve 210 according to the third embodiment of the present disclosure will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. The solenoid valve 210 of the present embodiment is a modified example of the solenoid valve 10 of the first embodiment and is a so-called normally closed type pilot solenoid valve.

[0090] As shown in FIG. 5, the solenoid valve 210 of the present embodiment uses a seat member 213 to which a strainer 212 is attached in the second flow path 36.

[0091] The strainer 212 includes a cup-shaped net member 214, and the opening edge portion of the net member 214 is fixed to the ring 216 and the ring 218 in a state of being sandwiched between the ring 216 and the ring 218.

[0092] A step portion 36A protruding radially inward is formed in the axial middle portion of the second flow path 36. The strainer 212 is inserted from above the second flow path 36 so that the ring 216 abuts against and catches on the step portion 36A, and is fixed inside the second flow path 36.

[0093] In the solenoid valve 210 of the present embodiment, foreign matter in the fluid flowing from the first flow path 34 to the second flow path 36 can be trapped by the net member 214, and the foreign matter can be suppressed from flowing to the downstream side of the second flow path 36.

[0094] Note that other operations and effects are the same as those in the first embodiment. Further, in the present embodiment, the net member 214 of the strainer 212 is cup-shaped, but it may have other shapes.

[0095] [Fourth Embodiment] Using FIG. 6, the solenoid valve 310 according to the third embodiment of the present disclosure will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

[0096] The solenoid valve 310 of this embodiment is a modified example of the solenoid valve 10 of the first embodiment. As shown in FIG. 6, a seat member 314 incorporating a check valve 312 is attached to the valve body 28.

[0097] The seat member 314 is formed in a cylindrical shape with a part thereof insertable into the valve body 28, and a stepped second flow path 316 is formed therethrough in the axial direction.

[0098] The second flow path 316 has a small diameter portion 316A on the seating portion 46A side, a first medium diameter portion 316B below the small diameter portion 316A, a valve seat 316C as an example of the check valve seat of the present disclosure which is tapered (chamfered) below the medium diameter portion 316B, a large diameter portion 316D below the valve seat 316C, and a second medium diameter portion 316E below the large diameter portion 316D.

[0099] A check valve body 318 is inserted into the second flow path 316. The check valve body 318 has a flange 318A at the intermediate portion in the longitudinal direction, and an O-ring 320 is attached to the outer peripheral portion of the flange 318A.

[0100] A plurality of guide portions 318B are formed on the upper portion of the flange 318A to slide on the inner peripheral surface of the first medium diameter portion 316B and guide the check valve body 318 in the axial direction.

[0101] A disc-shaped spring receiver 321 having a plurality of holes (not shown) formed therein is fixed to the second medium diameter portion 316E by a retaining ring 322.

[0102] A compression coil spring 324 as an example of the spring of the present disclosure is provided between the spring receiver 321 and the flange 318A of the check valve body 318.

[0103] A guide post 318C is formed on the lower portion of the flange 318A to be inserted into the compression coil spring 324 and guide the compression coil spring 324.

[0104] The check valve body 318 is biased upward by a compression coil spring 324, and the O-ring 320 of the check valve body 318 is pressed against the valve seat 316C of the second flow path 316. The check valve 312 of the present embodiment is constituted by the check valve body 318 and the valve seat 316C.

[0105] When fluid moves from the first flow path 34 side to the second flow path 36 side, the check valve body 318 moves to the downstream side of the second flow path 36 against the biasing force of the compression coil spring 324, and the O-ring 320 is separated from the valve seat 316C, allowing the fluid to flow to the downstream side of the second flow path 36.

[0106] On the other hand, when the valve is closed or when the pressure on the second flow path 36 side becomes higher than that on the first flow path 34 side, the O-ring 320 of the check valve body 318 is pressed against the valve seat 316C, preventing fluid from moving from the second flow path 36 side to the first flow path 34 side and suppressing backflow of the fluid to the upstream side of the solenoid valve.

[0107] Note that the check valve 312 is provided on the downstream side of the seating portion 46A where the main valve packing 78 of the main valve body 24 abuts in the fluid flow direction. Therefore, even if the pressure on the second flow path 36 side increases, the pressure is suppressed from acting on the main valve body 24, and the solenoid valve 310 in the closed state is suppressed from opening.

[0108] In the solenoid valve 310 of the present embodiment, since the check valve 312 for suppressing backflow is built into the sheet member 314, 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. Also, there is no need to provide a check valve in the flow path block 16, and the configuration of the flow path block 16 to which the solenoid valve 310 is attached is not complicated. Note that other operations and effects are the same as those of the first embodiment.

[0109] [Fifth Embodiment] The solenoid valve 410 according to the fifth embodiment of the present disclosure will be described with reference to FIG. 7. The same components as those in the above-described embodiments are denoted by the same reference numerals, and the description thereof is omitted.

[0110] As shown in FIG. 7, the solenoid valve 410 of the present embodiment includes both the strainer 212 of the third embodiment and the check valve 312 of the fourth embodiment.

[0111] In the solenoid valve 410 of the present embodiment, since the strainer 212 is disposed inside a plurality of guide portions that guide the check valve body, the strainer 212 can be compactly accommodated inside the second flow path 36.

[0112] Note that other operations 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.

[0113] [Other Embodiments] Although an example of the embodiment of the present disclosure has been described above, the embodiment of the present disclosure is not limited to the above, and it goes without saying that various modifications can be made without departing from the gist thereof.

[0114] In the solenoid valve 10 of the first embodiment, the seat member 30 is fixed to the valve body 28 by screwing the male screw 48 of the seat member 30 into the female screw 32A of the valve body 28. However, the present disclosure is not limited thereto. For example, the seat member 30 may be fixed to the valve body 28 with screws.

[0115] In the third to fifth embodiments, a normally closed type solenoid valve has been described. However, the third to fifth embodiments can also be a normally open type solenoid valve like the second embodiment.

[0116] The solenoid valves of the first to fifth embodiments were so-called pilot type solenoid valves, but they may be ordinary direct acting solenoid valves.

[0117] The solenoid valves of the first to fifth embodiments were configured to drive the main valve body 24 by a drive unit using magnetic force composed of a plunger, an armature, an electromagnetic coil, etc., but it may be configured as a so-called electric valve that drives the main valve body 24 by a drive device such as a motor. In particular, in the case of an electric valve, it can be used for a circuit that flows in from the seat member 30 side (so-called reverse flow circuit).

[0118] In the solenoid valve 410 according to the fifth embodiment, the strainer 212 was arranged inside a plurality of guide portions 318B that guide the check valve body 318, but the strainer 212 may be provided at a position away from the guide portion 318B.

[0119] In the above embodiment, the fluid was caused to flow into the solenoid valve from the first flow path 34 and flow out from the second flow path 36, but in some cases, the fluid may be caused to flow in from the second flow path 36 and flow out from the first flow path 34.

Explanation of reference numerals

[0120] 10 Solenoid valve (electrically driven valve) 18 Electromagnetic coil (drive unit) 22 Armature (drive unit) 24 Main valve body (valve body) 26 Plunger 28 Valve body 28B Lower side portion (second side portion) 30 Seat member 32 Mounting hole 32A Female screw 32B Tapered hole wall 34 First flow path 36 Second flow path 38 Main valve chamber (valve chamber) 46A Seating portion 48 Male screw 50 Tapered portion 52 Flange 56 O-ring (sealing member) 110 Solenoid valve (electrically driven valve) 210 Solenoid valve (electrically driven valve) 212 Strainer 213 Sheet member 310 Electromagnetic valve (electrically driven valve) 312 Check valve 314 Sheet member 316C Valve seat (check valve seat) 318 Check valve body 318B Guide part 324 Compression coil spring 324 (spring)

Claims

1. A valve body, a valve chamber in which the valve body moves along one direction, a first flow path that opens to a first side portion located in a direction intersecting the one direction and communicates with the valve chamber, and an attachment hole that opens to a second side portion located on one side of the one direction with respect to the valve chamber and communicates with the valve chamber. A valve body having: A seat member that is attached to the second side portion side of the valve body with a part thereof inserted into the attachment hole, is provided with a second flow path that communicates with the valve chamber and opens at an end opposite to the valve chamber side, and a seating portion that comes into contact with and separates from the valve body as the valve body moves in the one direction is provided on the valve chamber side of the second flow path. An electrically driven valve comprising:

2. A drive unit that drives the valve body is provided on the side opposite to the second side portion side of the valve body. The electrically driven valve according to Claim 1.

3. On the seat member, a male screw is formed on the outer peripheral portion. In the attachment hole of the valve body, a female screw that engages with the male screw is formed. The seat member is fixed to the valve body by screwing the male screw into the female screw. The electrically driven valve according to Claim 1 or Claim 2.

4. On the outer peripheral portion of the seat member, a conical tapered portion is formed. In the attachment hole of the valve body, a tapered hole wall that is in close contact with the tapered portion is formed. The electrically driven valve according to Claim 3.

5. On the seat member, a flange is formed on the side opposite to the seating portion side. A seal member is disposed between the flange and the second side portion of the valve body. The electrically driven valve according to Claim 4.

6. 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 blocks the movement of the fluid from the second flow path side to the first flow path side. The electrically driven valve according to Claim 1.

7. In the second flow path, a strainer for capturing foreign matter in the fluid is provided. The electrically driven valve according to Claim 1.

8. On the seat member, a check valve body that is movably disposed in the second flow path, a check valve seat against which the check valve body abuts, a spring that biases the check valve body toward the check valve seat, and a plurality of guide portions that slide and guide the check valve body on the inner surface of the second flow path. A check valve that allows the fluid to move from the first flow path side to the second flow path side and blocks the movement of the fluid from the second flow path side to the first flow path side is provided. In the second flow path, A strainer is provided inside the plurality of the guide portions to capture foreign matters in the fluid. The electrically driven valve according to claim 1.

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