Electrically driven valve

Abstract

The utility model provides an electric drive valve which prevents torsional load from being applied to a sealing piece when the electric drive valve is installed on a flow path block and improves reliability of sealing between a valve body and the flow path block. An electrically driven valve (11) is provided with: a valve body (12) having a valve chamber (13), a first flow path hole (14), and a second flow path hole (15); a valve body (18) that moves forward and backward with respect to the valve seat (17); and a motor (23) for driving the valve body, the valve body being provided with a flange portion (12c) protruding outward from the outer peripheral surface, a lower body (12b) located below the flange portion, and an upper body (12a) located above the lower body, and the lower surface of the flange portion being provided with a seal (21). An annular pressing screw (45) for pressing the flange downward is provided on the periphery of the upper body above the flange.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of electrically-driven valves, in particular to a kind of sealing structure between the valve main body and flow path block of box type electrically-driven valve. BACKGROUND

[0002] Electrically-driven valves (hereinafter, these will be collectively referred to as "electrically-driven valves") such as electric motor valves and solenoid valves, which use electric driving devices such as electric motors and solenoid actuators to open / close or control the flow rate of refrigerant, have been used in refrigerant cycle devices such as air conditioners, refrigerators, and refrigeration devices that have a refrigerant circuit.

[0003] In addition, there is a box type electrically-driven valve as such an electrically-driven valve (hereinafter, an electric motor valve will be described as an example). Figure 5 The valve mounting hole 52 of the flow path block 51 having the inflow path 42 and the outflow path 43 of refrigerant as shown can assemble the electric motor valve to the refrigerant circuit. Further, the valve mounting hole 52 has an internal thread 52a on the inner peripheral surface, and the valve body 53 has an external thread 53a formed on the outer peripheral surface thereof to be screwed with the internal thread 52a. In addition, the valve body 53 has a valve chamber 13, an inflow hole 14 that communicates with the inflow path 42 to allow refrigerant to flow into the valve chamber 13, and an outflow hole 15 that communicates with the outflow path 43 to allow refrigerant to flow out of the valve chamber 13. Inside the valve body 53, a valve core 18 that controls the flow rate of refrigerant by moving in and out with respect to a valve seat 17 (valve seat member 16) provided in the outflow hole 15 by being driven by an electric motor (not shown) is provided.

[0004] According to such a box type electric motor valve, for example, in a case where a manufacturer of the electric motor valve (referred to as a "valve manufacturer") provides the electric motor valve to a manufacturer of a refrigerant cycle device as a customer, as long as the valve manufacturer and the customer share the specifications such as the outer dimensions of the valve body 53, the positions of the inflow hole 14 (inflow path 42) and the outflow hole 15 (outflow path 43), and the like in advance, the customer side produces the flow path block 51 as a part of the refrigerant cycle device, and thus the customer side can complete the refrigerant cycle device by simply screwing the electric motor valve into the flow path block 51. Therefore, the customer can efficiently manufacture the refrigerant cycle device. In addition, in a case where the electric motor valve needs to be replaced at the time of maintenance of the refrigerant cycle device, the replacement work can also be performed by the same simple operation.

[0005] In addition, Patent Literature 1 below discloses such a box type electric motor valve.

[0006] PRIOR ART DOCUMENTS

[0007] PATENT LITERATURE

[0008] Patent Literature 1: Japanese Patent Application Publication No. 2011-149505

[0009] The utility model discloses to solve the technical problems

[0010] However, in the cartridge type electric valve, a sealing structure for preventing refrigerant from leaking to the outside is required between the electric valve (valve body 53) screwed into the valve mounting hole 52 of the flow path block 51 and the flow path block 51. The sealing structure has been conventionally configured as follows: a flange portion 54 (see FIG. 1) is formed at the upper end of the valve body 53 so as to project outwardly from the valve body 53 as compared with the valve mounting hole 52, and a sealing member (gasket) 55 is interposed between the flange portion 54 and the upper surface of the flow path block 51 (the periphery of the valve mounting hole 52) when the electric valve is mounted by screwing it into the valve mounting hole 52. Figure 5

[0011] However, the conventional sealing structure has room for improvement in terms of reliability. Specifically, in the conventional structure, the gasket 55 is subjected to a torsional load when it is pulled by the electric valve being rotated during tightening by screwing the electric valve. Therefore, if the gasket 55 is deformed or damaged, the sealing performance is reduced, and refrigerant leakage can occur.

[0012] In particular, in recent years, the use of CO2 refrigerant having a high operating pressure has been promoted in refrigeration cycle devices from the viewpoint of improving safety and reducing the environmental burden. Therefore, it is desirable to provide a sealing structure that is highly reliable and does not cause refrigerant leakage even for such high-pressure refrigerant. Content of the utility model

[0013] Therefore, an object of the present utility model is to improve the reliability of the sealing between the valve body and the flow path block.

[0014] Technical means for solving the technical problem

[0015] To achieve the object in order to solve the technical problem, the electric drive valve related to the present utility model is provided with: a valve body having a valve chamber, a first flow path hole communicating with the valve chamber and being either one of an inflow hole and an outflow hole for refrigerant, and a second flow path hole communicating with the valve chamber and being the other one of the inflow hole and the outflow hole for refrigerant; a valve core moving in and out with respect to a valve seat formed in the valve chamber; and a drive device driving the valve core, wherein, when a direction from the valve seat toward the drive device is set as up and a direction from the drive device toward the valve seat is set as down, the valve body has: a flange portion protruding outwardly from an outer peripheral surface of the valve body; a lower body portion being a portion on the lower side as compared with the flange portion; and an upper body portion being a portion on the upper side as compared with the lower body portion, the electric drive valve is provided with a sealing member at a lower surface of the flange portion, and is provided with an annular pressing screw around the upper body portion on the upper side as compared with the flange portion, the pressing screw pressing the flange portion downward. ​

[0016] Further, in the present application, the direction from the valve seat toward the driving device is "up", and the direction from the driving device toward the valve seat is "down", and the terms "upper", "lower", "upper surface", "lower surface", "upper side", "lower side", and the like are used in association with up and down. Further, the electrically driven valve of the present application can be used in various orientations, and therefore "down" is not limited to the direction of gravity, and "up" is not limited to the direction opposite to gravity.

[0017] The electrically driven valve according to the present application is a cartridge type electrically driven valve installed in a flow path block.

[0018] The flow path block has: a valve mounting hole that can accept the electrically driven valve; a first flow path that opens at the inner surface of the valve mounting hole and is either one of an inflow path and an outflow path for a refrigerant; and a second flow path that opens at the inner surface of the valve mounting hole and is the other one of the inflow path and the outflow path for the refrigerant.

[0019] The valve mounting hole has: an upper hole portion having a large inner diameter, which is formed with an internal thread at an inner peripheral surface and extends from the top surface toward the bottom surface of the flow path block; a lower hole portion having a small inner diameter, which is continuous with the upper hole portion and further extends toward the bottom surface of the flow path block; and a step portion that is an annularly expanded step portion formed between the upper hole portion and the lower hole portion.

[0020] Further, the first flow path hole and the second flow path hole are formed in the lower body. When the electrically driven valve is installed in the valve mounting hole, the lower body is inserted into the lower hole portion, the first flow path hole communicates with the first flow path, the second flow path hole communicates with the second flow path, an annular gap space is formed between the outer peripheral surface of the upper body and the inner peripheral surface of the upper hole portion, and the pressing screw is accommodated in the gap space. The pressing screw has an external thread for screwing with the internal thread at the outer peripheral surface, and presses the flange portion downward by being screwed into the gap space, whereby the seal member is sandwiched between the flange portion and the step portion. The seal member has a metal plate and a seal member layer composed of rubber or resin respectively at the upper surface and the lower surface of the metal plate.

[0021] The operation of installing the electrically driven valve according to the present application in the flow path block is described. After the valve body is inserted into the valve mounting hole of the flow path block, the pressing screw is screwed into the internal thread of the valve mounting hole and tightened by being screwed into the above-mentioned gap space. By this screwing operation, the pressing screw advances downward in the upper hole portion (in the gap space), and after abutting against the upper surface of the flange portion, presses the flange portion downward toward the step portion. Therefore, the seal member provided at the lower surface of the flange portion is sandwiched between the flange portion and the step portion, and sealing (closure) between the valve body and the flow path block is achieved.

[0022] However, in the screwing-in operation of the pressing screw described above, instead of screwing in the valve body as in the past, the flange portion is pressed straight downward (without rotation) by rotating the pressing screw provided on the surface (upper surface of the flange portion) on the side opposite to the seal member of the member separate from the valve body (flange portion), and thus the seal member is not subjected to a torsional load (or even if the valve body is rotated by the rotation of the pressing screw, the rotation is extremely small, and the torsional load applied to the seal member is extremely small), and deformation or damage of the seal member can be prevented.

[0023] Further, in the operation described above, it is preferable to apply a lubricant (e.g., grease, oil) in advance between the pressing screw and the flange portion. This is to prevent the pressing screw from rotating together with the flange portion (rotating together) at the time of screwing in, particularly in the tightening operation, and thus to prevent the rotation of the pressing screw from being transmitted to the seal member via the flange portion.

[0024] Effects of the Invention

[0025] According to the electrically driven valve related to the present application, when installed in the flow path block, the seal member is not subjected to a torsional load (or almost none), and thus the reliability of the seal between the valve body and the flow path block can be improved.

[0026] Other objects, features and advantages of the present application will become more apparent from the following description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings. In addition, like reference numerals are used to denote like or equivalent parts throughout the several views of the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a longitudinal sectional view showing an electrically driven valve (closed valve state) related to one embodiment of the present application.

[0028] Figure 2 is a longitudinal sectional view showing an electrically driven valve (open valve state) related to the embodiment.

[0029] Figure 3 is an enlarged longitudinal sectional view showing a main part (B part of Figure 1 ) of the electrically driven valve related to the embodiment.

[0030] Figure 4 is an enlarged longitudinal sectional view showing a gasket setting part (C part of Figure 3 ) of the electrically driven valve related to the embodiment.

[0031] Figure 5 is a longitudinal sectional view showing a main part (corresponding to the B part of Figure 3 ) of a conventional electrically driven valve, like Figure 1 .

[0032] Symbol Explanation

[0033] A Center axis (rotation axis of the rotor)

[0034] F Flow of the refrigerant

[0035] 11 Electrically operated valve (electrically driven valve)

[0036] 12, 53 Valve main body

[0037] 12a Upper main body

[0038] 12b Lower main body

[0039] 12c, 54 Flange portion

[0040] 12d Through hole (valve core guide hole)

[0041] 12e Reduced diameter portion

[0042] 13 Valve chamber

[0043] 14 Inflow hole

[0044] 15 Outflow hole

[0045] 16 Valve seat member

[0046] 17 Valve seat

[0047] 18 Valve core

[0048] 19 Housing

[0049] 20 Base member

[0050] 21, 55 Gasket (seal member)

[0051] 21a Metal plate

[0052] 21b Seal member layer

[0053] 22 Seal member (O-ring)

[0054] 23 Motor (stepping motor)

[0055] 24 Stator

[0056] 25 Rotor

[0057] 26 Magnetic yoke

[0058] 27 Coil holder

[0059] 28 Coil

[0060] 29 Resin molded cover

[0061] 30 Speed reduction mechanism (singular planetary gear speed reduction mechanism)

[0062] 31 output gear

[0063] 32 transmission mechanism

[0064] 33 valve core drive shaft

[0065] 34 bearing member

[0066] 35 external thread

[0067] 36 internal thread

[0068] 37, 51 flow passage block

[0069] 38, 52 valve mounting hole

[0070] 39 upper hole portion

[0071] 39a, 52a internal thread

[0072] 40 lower hole portion

[0073] 41 stepped portion

[0074] 42 inflow passage

[0075] 43 outflow passage

[0076] 44 gap space

[0077] 45 pressing screw member

[0078] 45a, 53a external thread DETAILED DESCRIPTION

[0079] Reference Figures 1-4 An electrically driven valve according to one embodiment of the present application will be described. In addition, in each drawing, a two-dimensional coordinate indicating directions orthogonal to each other, an up-down direction and a left-right direction, is appropriately shown, and the following description is made based on these directions. However, the electrically driven valve of the present application and the present embodiment can be used in various orientations, and each direction is for convenience of explanation, and the structure of each part of the present application is not limited to these directions. In addition, "vertical" and "horizontal" will be mentioned, but the vertical direction coincides with the up-down direction, and the direction orthogonal to the vertical direction is the horizontal direction including the left-right direction.

[0080] As Figures 1-4 shown, the electrically driven valve 11 according to the present embodiment is, for example, a so-called cartridge type electric valve that controls the flow rate of refrigerant by being incorporated into a refrigerant cycle device such as a heat pump type refrigeration and heating system by being mounted to a flow passage block 37 provided in the refrigerant cycle device.

[0081] The flow path block 37 has a valve mounting hole 38 into which the electric valve 11 is inserted, an inflow path 42 that opens at the side (inner peripheral surface) of the valve mounting hole 38 by horizontally penetrating the side wall of the flow path block 37, and an outflow path 43 that opens at the bottom surface of the valve mounting hole 38 by vertically penetrating the bottom surface portion of the flow path block 37. The valve mounting hole 38 is composed of an upper hole portion 39 that includes an opening (referred to as "top surface opening") of the top surface (upper surface) of the flow path block 37, and a lower hole portion 40 that extends downward from the upper hole portion 39. The inner diameter of the lower hole portion 40 is smaller than that of the upper hole portion 39, and thus a stepped portion 41 in the form of a ring is formed between the upper hole portion 39 and the lower hole portion 40.

[0082] On the other hand, the electric valve 11 has a valve body 12 that has a valve chamber 13 inside, a valve core 18 that is provided inside the valve chamber 13 so as to be vertically movable, a motor 23 that drives the valve core 18, a speed reduction mechanism 30 that reduces the rotation generated by the motor 23, a transmission mechanism (thread feed mechanism) 32 that converts the rotation reduced by the speed reduction mechanism 30 into linear motion and transmits it to the valve core, and a housing (closed container) 19 that forms a closed space at the upper surface portion of the valve body 12.

[0083] The valve body 12 is a cylindrical member that has a ring-shaped flange portion 12c that protrudes outwardly horizontally from the outer peripheral surface, a lower body 12b that is a portion on the lower side compared to the flange portion 12c, and an upper body 12a that is a portion on the upper side compared to the lower body 12b.

[0084] A gasket 21 is provided at the lower surface of the flange portion 12c, and when the valve body 12 is inserted into the valve mounting hole 38 and the electric valve 11 is mounted to the flow path block 37, the flange portion 12c abuts against the stepped portion 41 via the gasket 21. At this time, the lower body 12b is inserted into the lower hole portion 40 of the valve mounting hole 38. Furthermore, the lower end portion of the upper body 12a is disposed inside the upper hole portion 39 of the valve mounting hole 38, and the upper portion of the upper body 12a protrudes upward compared to the top surface opening (upper surface of the flow path block 37).

[0085] In the above-described state where the valve body 12 is inserted into the valve mounting hole 38, an annular gap space 44 is formed between the outer peripheral surface of the upper body 12a and the inner peripheral surface of the upper hole portion 39. This gap space 44 is a space for screwing in a pressing screw 45 that fastens the valve body 12 to the flow passage block 37. The pressing screw 45 is a cylindrical (annular) screw having an external thread 45a that is screwed with an internal thread 39a formed on the inner peripheral surface of the upper hole portion 39, and in order to fix the electric valve 11 to the flow passage block 37, it is only necessary to screw the pressing screw 45 into the upper hole portion 39 with the valve body 12 inserted into the valve mounting hole 38. The screwed-in pressing screw 45 presses the flange portion 12c against the step portion 41, and prevents the valve body 12 (electric valve 11) from coming out of the valve mounting hole 38. In addition, in this fixed state, the gasket 21 provided on the lower surface of the flange portion 12c is sandwiched between the flange portion 12c and the step portion 41, thereby achieving sealing between the valve body 12 and the flow passage block 37.

[0086] Further, as Figure 4 As shown in enlargement, the gasket 21 is provided with a seal member layer 21b made of a sealing member such as rubber on the upper and lower surfaces of the metal plate 21a.

[0087] In addition, in the screwing-in operation of the above-described pressing screw 45, the flange portion 12c and the gasket 21 are not rotated but are pushed by the pressing screw 45 and pressed downward to be pressed against the step portion 41, and therefore there is no case where the gasket 21 is twisted as in the past, and it is possible to prevent the gasket 21 from being deformed or damaged. Therefore, it is possible to improve the reliability of the sealing based on this gasket 21. Moreover, even if the pressing screw 45 is tightened with great force, since only the flange portion 12c that protrudes outward from the outer peripheral surface of the valve body 12 is sandwiched between the pressing screw 45 and the step portion 41, unlike the past structure where the valve body 53 is screwed in, there is no case where a twisting load is applied to the entire valve body 12 to cause skewing.

[0088] The valve chamber 13, the inflow hole 14, and the outflow hole 15 are formed in the lower body 12b. Specifically, the valve chamber 13 is formed in the inner central portion of the lower body 12b. The inflow hole 14 penetrates the side surface of the lower body 12b horizontally to open in the side surface (inner peripheral surface) of the valve chamber 13, and communicates with the inflow passage 42 when the valve body 12 is mounted in the valve mounting hole 38. The outflow hole 15 penetrates the bottom surface portion of the lower body 12b vertically to open in the bottom surface of the valve chamber 13, and communicates with the outflow passage 43 when the valve body 12 is mounted in the valve mounting hole 38.

[0089] A cylindrical valve seat member 16 is fixed to the flow-out hole 15. The valve seat member 16 has a valve seat 17 on the upper surface portion. A valve core 18 moves in and out (up and down) with respect to the valve seat 17, thereby controlling the flow rate of the refrigerant. The through hole 12d of the upper portion of the lower body 12b (the upper surface portion of the valve chamber 13) is a valve core guide hole that supports the valve core 18 so as to be slidable up and down.

[0090] In addition, in order to prevent the refrigerant from directly leaking from the flow-in hole 14 (flow-in path 42) to the flow-out hole 15 (flow-out path 43), a seal member (O-ring) 22 is provided on the outer peripheral surface of the lower end portion of the lower body 12b so as to be interposed between the inner peripheral surface of the lower hole portion 40 of the flow path block 37.

[0091] A reduced diameter portion 12e, in which the inner diameter is constant but the outer diameter is reduced, is formed on the upper end portion of the upper valve core 12a. A stepped portion is provided on the outer peripheral surface of the reduced diameter portion 12e, and an outer shell 19 is fusion-bonded and fixed to the stepped portion via an annular base member 20. The outer shell 19 is a cylindrical metal container that is open at the bottom and closed at the top, and the inside thereof is a sealed space that communicates with the valve chamber 13. A rotor 25 that constitutes a motor 23 is rotatably accommodated in the inside of the outer shell 19.

[0092] As the motor 23, a stepping motor is used in the present embodiment. The stepping motor 23 is constituted by the above-described rotor 25 accommodated in the outer shell 19 and a stator 24 provided on the outside (periphery) of the outer shell 19. The stator 24 includes a magnetic yoke 26, a coil 28 in which winding is performed on a coil holder 27, and a resin molded cover 29 that covers the magnetic yoke 26 and the coil 28.

[0093] The above-described reduction mechanism 30 that reduces the rotation of the rotor 25 is provided in the inside of the rotor 25. In the present embodiment, the reduction mechanism 30 uses a singular planetary gear reduction mechanism that is small and can obtain a large reduction ratio. The rotation reduced by the reduction mechanism 30 is output from an output gear 31.

[0094] The upper end portion of a valve core drive shaft 33 is connected to the output gear 31. The valve core drive shaft 33 constitutes the above-described transmission mechanism 32 that converts the rotation reduced by the reduction mechanism (singular planetary gear reduction mechanism) 30 into linear motion and transmits it to the valve core 18.

[0095] That is, the valve core drive shaft 33 is arranged so as to extend in the vertical direction along the central axis A of the electric valve 11, and is supported so as to be rotatable by a cylindrical bearing component 34 inserted into the upper part of the valve body 12 (upper body 12a). In addition, the lower end of the valve core drive shaft 33 is inserted into the upper end of the valve core 18, and an external thread 35 is formed on the outer peripheral surface of the valve core drive shaft 33. On the other hand, an internal thread 36 is formed on the inner peripheral surface of the upper end of the valve core 18 into which the valve core drive shaft 33 is inserted, into which the external thread 35 is screwed. These external threads 35 and internal threads 36 constitute a thread feed, so that when the valve core drive shaft 33 connected to the output gear 31 rotates, the valve core 18 moves upward or downward due to the function of this thread feed.

[0096] In this embodiment, the central axis A of the valve body 12 , valve seat member 16 , valve seat 17 , valve element 18 , valve element drive shaft 33 , and bearing member 34 and the rotation axis of the rotor 25 extend in the vertical direction and coincide with each other.

[0097] Next, the operation of the electric valve 11 according to this embodiment will be described.

[0098] When current is supplied to the stator 24 (coil 28) so that the rotor 25 Figure 1 When the valve is in the closed state shown in FIG. 1 , the rotation of the rotor 25 is decelerated by the reduction gear 30 and output from the output gear 31, thereby rotating the valve core drive shaft 33. The rotation of the valve core drive shaft 33 is converted into linear motion by thread feed, that is, the external thread 35 of the valve core drive shaft 33 and the internal thread 36 of the valve core 18, thereby moving the valve core 18 upward. As a result, the valve core 18 leaves the valve seat 17, and the refrigerant flowing into the valve chamber 13 passes through the inlet path 42 and the inlet hole 14 and passes through the outflow hole 15 and flows out from the outflow path 43 (see FIG. 1 ). Figure 2 The amount of refrigerant passing through (refrigerant flow rate) in the valve-open state can be adjusted by the amount of rotation of the rotor 25 (the distance between the valve seat 17 and the valve element 18).

[0099] On the other hand, when current is supplied to the stator 24 (coil 28) so that the rotor 25 rotates from the valve-open state in a direction opposite to the above-mentioned direction, the rotation of the rotor 25 is decelerated and output from the output gear 31, and the valve core drive shaft 33 rotates in the opposite direction. The rotation of the valve core drive shaft 33 is converted into linear motion by thread feed (external thread 35 and internal thread 36), so that the valve core 18 moves downward. And, when the valve core 18 is seated (abutted) on the valve seat 17, the flow path between the inflow path 42 and the inflow hole 14 and the outflow hole 15 and the outflow path 43 is cut off, thereby becoming a valve-closed state (refer to Figure 1 ).

[0100] Further, in the above action explanation, the refrigerant flows in from the inflow path 42 and the inflow hole 14 and flows out from the outflow hole 15 and the outflow path 43, but it is also possible to use the electric valve 11 in a manner that the refrigerant flows in from the outflow path 43 and the outflow hole 15 and flows out from the inflow hole 14 and the inflow path 42.

[0101] The embodiments of the present application have been described above, but the present application is not limited to this, and it is of course understood by those skilled in the art that various modifications can be made within the scope recited in the patent request.

[0102] For example, in the above embodiment, the valve core is driven by the electric motor, but it is also possible to configure an electromagnetic valve that drives the valve core by an electromagnetic actuator based on the present application.

Claims

1. An electrically driven valve comprising: a valve body having a valve chamber, a first flow path hole communicating with the valve chamber and serving as either an inflow hole or an outflow hole for a refrigerant, and a second flow path hole communicating with the valve chamber and serving as the other of the inflow hole and the outflow hole for the refrigerant; a valve core that moves forward and backward relative to a valve seat formed in the valve chamber; and A driving device, which drives the valve core, is characterized in that: When the direction from the valve seat toward the drive device is set as upward, and the direction from the drive device toward the valve seat is set as downward, The valve body has: a flange portion protruding outward from an outer peripheral surface of the valve body; a lower body, the lower body being a portion below the flange portion; as well as an upper body, which is a portion located above the lower body; The electrically driven valve includes a seal on the lower surface of the flange portion. An annular pressing screw is provided around the upper body above the flange portion, and presses the flange portion downward.

2. The electrically driven valve according to claim 1, characterized in that: The seal has: Metal sheets; and A sealing layer is formed of rubber or resin provided on the upper surface and the lower surface of the metal plate.

3. The electrically driven valve according to claim 1 or 2, characterized in that: The electric drive valve is a cassette-type electric drive valve installed in the flow path block. The flow path block comprises: a valve mounting hole capable of receiving the electrically driven valve; a first flow path that opens on the inner surface of the valve mounting hole and serves as either an inflow path or an outflow path for the refrigerant; as well as a second flow path that opens on the inner surface of the valve mounting hole and serves as the other of the inflow path and the outflow path of the refrigerant, The valve mounting hole has: an upper hole portion having a large inner diameter, the upper hole portion having an internal thread formed on an inner peripheral surface thereof and extending from a top surface toward a bottom surface of the flow path block; a lower hole portion having a small inner diameter, the lower hole portion being continuous with the upper hole portion and further extending toward the bottom surface of the flow path block, and a step portion, the step portion being an annularly expanded step portion formed between the upper hole portion and the lower hole portion, The first flow path hole and the second flow path hole are formed in the lower body, When the electrically driven valve is installed in the valve installation hole, The lower body is embedded in the lower hole. The first flow path hole is connected to the first flow path, The second flow path hole is connected to the second flow path, An annular gap space is formed between the outer circumferential surface of the upper body and the inner circumferential surface of the upper hole portion, and the pressing screw is accommodated in the gap space. The pressing screw has an external thread on its outer peripheral surface for threading with the internal thread, and the pressing screw presses the flange portion downward by being screwed into the gap space. Thus, the seal is sandwiched between the flange portion and the step portion.

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