Valve device, electrically operated valve, and refrigeration cycle system

Abstract

The purpose of the present invention is to provide a valve device, an electrically operated valve, and a refrigeration cycle system that can reduce vibration and noise when a drive unit rotates. A valve device (1) is provided with a valve body (10), a female screw member (40), and a male screw member (60). The female screw member (40) and the male screw member (60) are screwed together to form a feed screw mechanism. The female screw member (40) has a first female screw member (41) and a second female screw member (54) which are separated from each other, and the first female screw member (41) and the second female screw member (54) are respectively screwed to the male screw member (60). The first female screw member (41) and the second female screw member (54) are connected so as not to rotate relative to each other about the axis (L) and so as to be movable relative to each other in the direction of the axis (L), and are biased relative to each other in the direction of the axis (L) by a coil spring (58).

Description

Technical Field

[0001] The invention relates to a valve device, an electric valve and a refrigeration cycle system. Background Art

[0002] A valve device (electric valve) is known, which includes: a valve body (valve housing) having a valve chamber inside; a support member (internal thread bracket) fixed to the valve body; an internal thread member fixed to the support member; an external thread member (rotor shaft) driven to rotate by a driving unit (stepping motor); and a valve member (valve bracket and valve core) connected to the front end side of the external thread member (for example, refer to Patent Document 1). In the valve device, the following feed screw mechanism is configured: the external thread member threadedly engaged with the internal thread member is driven to rotate, so that the valve member moves forward and backward along the axial direction.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2003-148643 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the conventional valve device as described above, for example, as disclosed in Patent Document 1 Figure 4 As shown in the electric valve, the threads of the threaded internal thread component 31 and the rotor shaft 41 (external thread component) slide against each other, but a predetermined gap is provided between the threads (sliding parts) to stabilize the operation, which causes vibration and noise when the drive unit rotates.

[0008] An object of the present invention is to provide a valve device, an electric valve, and a refrigeration cycle system, which can reduce vibration and noise when a driving part rotates.

[0009] Solutions to Solve Problems

[0010] In order to solve the above-mentioned problems and achieve the purpose, the valve device of the present invention comprises: a valve body, which has a valve chamber inside; a fixed threaded component, which is supported by the valve body; a driving threaded component, which is rotationally driven by a driving unit; and a valve component, which is connected to the driving threaded component, wherein the following feed screw mechanism is constructed: the fixed threaded component is threadedly connected to the driving threaded component, and the driving threaded component is rotationally driven to cause the valve component to move forward and backward in the axial direction, and one of the fixed threaded component and the driving threaded component is constructed as a first component and a second component that are separate from each other, the first component and the second component are respectively threadedly connected to the other of the fixed threaded component and the driving threaded component, the first component and the second component are connected in a manner that they cannot rotate relative to each other but can move relative to each other in the axial direction, and are urged to each other in the axial direction by a force applying mechanism.

[0011] According to the present invention, the first component and the second component of one of the fixed thread component and the driving thread component are mutually urged in the axial direction by the urging mechanism, thereby enabling the fixed thread component and the driving thread component to slide against each other without gap in the axial direction, and enabling the load generated by the force in the axial direction to always act on the sliding part of the fixed thread component and the driving thread component. Furthermore, the above-mentioned load can be used to generate sliding resistance between the fixed thread component and the driving thread component, thereby reducing vibration and noise when the driving part rotates. Therefore, a valve device that can reduce vibration and noise when the driving part rotates can be provided.

[0012] In this case, it is preferable that the urging mechanism is provided between the first member and the second member to urge the first member and the second member in directions away from each other in the axial direction. Figure 1In the electric valve shown in the figure, a compression coil spring 66 is provided between the upper end of the rotor shaft 41 and the lower surface of the upper end of the rotor housing 44, so as to apply force to the rotor shaft 41 toward the valve seat member 14 side in the axial direction. As a result, the force of the compression coil spring 66 applies a load to the thread surface, generating sliding resistance, thereby reducing the vibration when the drive unit is in operation and reducing the vibration sound. However, in this structure, the compression coil spring 66 expands and contracts as the rotor shaft 41 moves, so it is necessary to ensure a corresponding amount of space. In addition, due to the expansion and contraction of the compression coil spring 66, the above-mentioned force changes in accordance with the change in the opening of the valve port 13 in the electric valve, for example, the larger the opening of the valve port 13, the larger the spring load of the compression coil spring 66, and it is difficult to stably maintain the vibration suppression effect. However, according to this structure, the urging mechanism is provided between the first component and the second component whose relative position relationship is difficult to change in the axial direction due to the threaded connection, and the first component and the second component are urged in the direction of separation from each other in the axial direction, so it is possible to suppress the expansion and contraction of the urging mechanism in the axial direction accompanying the forward and backward movement of the valve component, and there is no need to prepare a space for the expansion and contraction. Therefore, it can contribute to space saving of the electric valve. In addition, as described above, since the force-applying mechanism is suppressed from expanding and contracting in the axial direction accompanying the forward and backward movement of the valve member, for example, even if the opening of the valve port of the electric valve changes, the load in the axial direction of the force-applying mechanism can always be constant, and the effect of reducing the above-mentioned vibration and noise can be stably maintained. Therefore, in a valve device that can reduce the vibration and noise when the drive unit rotates, space saving can be achieved, and the state of reducing the vibration and noise when the drive unit rotates can be stably maintained.

[0013] In this case, the urging mechanism may be provided from an end surface of the first member in the axial direction to an end surface of the second member in the axial direction.

[0014] In addition, the urging mechanism may be a coil spring or a leaf spring assembly formed by combining leaf springs.

[0015] In addition, the valve device is characterized in that the first component has an internal threaded portion and a guide portion in the cylindrical interior, the second component is guided by the guide portion in the axial direction, and the inner periphery of the guide portion is engaged with the outer periphery of the second component in a manner that cannot rotate relative to each other around the axis. According to such a structure, the inner periphery of the guide portion is engaged with the outer periphery of the second component, so that the entire circumference of the second component around the axis is surrounded by the first component over the entire length of the axial direction. Therefore, the first component and the second component can be connected more reliably in a manner that cannot rotate relative to each other and can move relative to each other in the axial direction. In addition, according to this structure, the second component is guided by the guide portion over the entire length of the axial direction, so compared with the structure in which a part of the entire length of the second component in the axial direction is guided by the guide portion, the inclination of the second component relative to the axial direction can be suppressed. Therefore, it is possible to avoid the situation in which the sliding resistance is accidentally increased between the fixed thread component and the driving thread component due to the inclination of the second component, resulting in poor operation.

[0016] In addition, it is preferred that a fitting portion formed by any one of a D-shaped cut portion, a double-sided chamfered portion, a protrusion, a keyway, and a polygonal portion is provided on one of the inner periphery of the guide portion and the outer periphery of the second component, and a fitted portion fitted with the fitting portion is provided on the other of the inner periphery of the guide portion and the outer periphery of the second component. According to such a structure, the fitting portion is formed by various shapes such as a D-shaped cut portion, a double-sided chamfered portion, a protrusion, a keyway, and a polygonal portion, and the fitting portion is fitted with the fitted portion, so that the first component and the second component can be connected in a manner that they cannot rotate relative to each other but can move relative to each other in the axial direction.

[0017] In addition, the fixing threaded component may include the first component and the second component, the first component being a first internally threaded component having a first internally threaded thread and fixed to the valve body, the second component being a second internally threaded component having a second internally threaded thread, and the driving threaded component being an externally threaded component having an externally threaded threaded connection with the first internally threaded thread and the second internally threaded thread. According to such a structure, the present invention can be applied to a structure in which the fixing threaded component is constituted by the first internally threaded component and the second internally threaded component, and the driving threaded component is a externally threaded component.

[0018] In addition, the fixing threaded component may be an internal threaded component having an internal thread and fixed to the valve body, and the driving threaded component may include the first component and the second component, wherein the first component is a first external threaded component having a first external thread threadedly coupled to the internal thread, and the second component is a second external threaded component having a second external thread threadedly coupled to the internal thread. According to such a structure, the present invention can be applied to a structure in which the fixing threaded component is an internal threaded component and the driving threaded component is a first external threaded component and a second external threaded component.

[0019] In addition, the fixing threaded component may be an external threaded component having an external thread and fixed to the valve body, and the driving threaded component may include the first component and the second component, wherein the first component is a first internal threaded component having a first internal thread threadedly coupled to the external thread, and the second component is a second internal threaded component having a second internal thread threadedly coupled to the external thread. According to such a structure, the present invention can be applied to a structure in which the fixing threaded component is an external threaded component and the driving threaded component is a first internal threaded component and a second internal threaded component.

[0020] In addition, the fixing threaded component may include the first component and the second component, the first component being a first externally threaded component having a first externally threaded thread and fixed to the valve body, the second component being a second externally threaded component having a second externally threaded thread, and the driving threaded component being an internally threaded component having an internally threaded thread that is threadedly coupled to the first externally threaded thread and the second externally threaded thread. According to such a structure, the present invention can be applied to a structure in which the fixing threaded component is constituted by the first externally threaded component and the second externally threaded component, and the driving threaded component is a internally threaded component.

[0021] In addition, the electric valve of the present invention is characterized in that the driving part in any one of the valve devices described above includes an electric motor. According to such a structure, in the electric valve whose driving part includes an electric motor, vibration and noise when the driving part rotates can be reduced.

[0022] In addition, the refrigeration cycle system of the present invention is characterized by comprising the above-mentioned electric valve. According to such a configuration, the refrigeration cycle system can be configured using the electric valve that can reduce vibration and noise when the driving unit rotates.

[0023] Effects of the Invention

[0024] According to the present invention, it is possible to provide a valve device, an electric valve, and a refrigeration cycle system capable of reducing vibration and noise when a driving part rotates. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a longitudinal sectional view of the valve device according to the first embodiment of the present invention cut along the axis of the needle portion.

[0026] Figure 2 (A) to (D) are schematic diagrams showing changes in the rotation restricting portion in the second internal thread member.

[0027] Figure 3 Yes Figure 1 An enlarged and simplified cross-sectional view of the main parts of the valve device.

[0028] Figure 4 (A) to (D) are schematic diagrams showing the assembly procedure of the valve device.

[0029] Figure 5 (E) to (G) are the assembly sequence of the valve device. Figure 4 A schematic diagram of the sequence after the sequence shown in (D).

[0030] Figure 6 This is a longitudinal sectional view of the valve device according to the second embodiment cut along the axis of the needle portion.

[0031] Figure 7 Yes Figure 6 FIG. 2 is an enlarged and simplified cross-sectional view of a main part of a valve device according to a second embodiment.

[0032] Figure 8 This is a longitudinal sectional view of the valve device according to the third embodiment cut along the axis of the needle portion.

[0033] Fig. 9 yes Figure 8 An enlarged cross-sectional view of a main portion of a valve device according to a third embodiment of the present invention.

[0034] Fig.10 This is a schematic diagram showing an example of the refrigeration cycle system of the present invention.

[0035] Explanation of symbols

[0036] L—axis line, 1—valve device, 10—valve body, 40—internal thread component (fixed thread component), 41—first internal thread component (first component), 54—second internal thread component (second component), 58—coil spring (urging mechanism), 60—external thread component (driving thread component), 70—driving part, 80—valve component. DETAILED DESCRIPTION

[0037] The following is based on Figure 1 to Figure 5 A valve device 1 according to a first embodiment of the present invention will be described. The valve device 1 is a device for controlling the flow rate of a fluid, and is used, for example, in a refrigeration cycle system 100 (see Fig.10 ) is a part of an electric valve. In addition, in the following description, the direction along the axis L of the needle portion 88 described later is referred to as the "axis L direction", one side of the axis L direction is referred to as the "one side L1", and the other side of the axis L direction is referred to as the "other side L2". In addition, the direction intersecting the axis L direction is referred to as the radial direction. This is only for the convenience of description, and does not necessarily limit the directions in the actual use state of the valve device 1.

[0038] The valve device 1 includes a valve body 10 formed into a cylindrical shape by cutting a metal material such as stainless steel or brass. The interior of the valve body 10 constitutes a valve chamber 11. A first port 12 penetrating in the radial direction is formed on the side wall of the valve body 10, and a primary joint pipe 13 is installed, the interior of which is connected to the valve chamber 11 via the first port 12. A cylindrical second port 14 opening to the valve chamber 11 with the axis L as the center is formed on the bottom wall (the wall portion on the other side L2) of the valve body 10. The opening peripheral edge portion of one side L1 (the valve chamber 11 side) of the second port 14 constitutes a valve seat portion 15. The second port 14 expands in diameter as it moves toward the other side L2, and the end portion of the other side L2 is open to the outside. A cylindrical portion 16 protruding toward the other side L2 is formed on the surface of the other side L2 of the bottom wall of the valve body 10, and a secondary joint pipe 16a is installed in the cylindrical portion 16. The interior of the secondary joint pipe 16a is connected to the valve chamber 11 via the second port 14.

[0039] An opening 17 is formed on the upper wall (the wall on one side L1) of the valve body 10 and extends in the direction of the axis L. A cylindrical valve guide member 18 is pressed into the inner peripheral surface of the opening 17 and fixed by riveting. A valve guide hole 18a is formed at the center of the valve guide member 18 and extends in the direction of the axis L. A needle 88 of a valve member 80 described later is inserted into the valve guide hole 18a. A cylindrical flange 19 is formed on the opening edge on one side L1 of the opening 17 and extends upward toward the one side L1. A support member 20 is assembled on the outer peripheral surface of the flange 19. The support member 20 is formed in a cylindrical shape using a metal material such as stainless steel or brass, and is fixed to the valve body 10 by riveting the flange 19 from the radially outer side and brazing the end surface on the other side L2 to the end surface on the one side L1 of the valve body 10.

[0040] One side L1 of the support member 20 is open in the direction of the axis L, and the housing 30 formed into a bottomed cylindrical shape by a metal material such as stainless steel is fixed to the open end face thereof by fixing the open end edge thereof by welding or the like. An internal thread member 40 (fixed thread member) is mounted and supported on the inner peripheral surface of the opening of the one side L1 of the support member 20. The internal thread member 40 includes a first internal thread member 41 (first member) and a second internal thread member 54 (second member). The first internal thread member 41 includes a press-fit portion 42, a flange portion 43, a bracket guide portion 44, and a shaft guide portion 46 in order from the other side L2 toward the one side L1.

[0041] The press-in portion 42 is formed of a resin material into a cylindrical shape extending in the direction of the axis L, and is pressed into the inner peripheral surface of the opening on one side L1 of the support member 20. The flange portion 43 is formed of a metal material into an annular shape, and is integrated with the press-in portion 42 by insert molding. The end surface of the other side L2 of the flange portion 43 is fixed to the end surface of the one side L1 of the support member 20 by welding or the like. The bracket guide portion 44 is continuous with the press-in portion 42 and extends to the one side L1 along the axis L. A bracket guide hole 45 is formed in the center of the inside of the bracket guide portion 44, which penetrates the press-in portion 42 and opens to the other side L2, and the one side L1 portion of the valve bracket 81 described later is accommodated in the bracket guide hole 45.

[0042] The shaft guide portion 46 is continuous with the bracket guide portion 44, and is formed into a cylindrical shape by extending to one side L1 along the axis L. A spiral guide groove 47 is formed on the outer wall surface of the shaft guide portion 46, and a coil-shaped slider 48 is provided in the guide groove 47. A claw portion 49 protruding radially outward is formed on the slider 48, and the claw portion 49 can abut against a magnetic protrusion 63 of a magnetic rotor 62 described later around the axis L. A first threaded hole 50 extending in the direction of the axis L and opening to one side L1 and a guide portion 52 continuous with the first threaded hole 50 and extending in the direction of the axis L and opening to the other side L2 are formed in the center of the shaft guide portion 46. A first internal thread 51 (internal thread portion) is formed on the inner peripheral surface of the first threaded hole 50. The first internal thread 51 is threadedly engaged with an external thread 64 of an external thread component 60 (driving thread component) described later. The guide portion 52 is formed to have a larger inner diameter than the first threaded hole 50 and extends to the other side L2. The inner wall surface (inner periphery) of the guide portion 52 has a shape that follows the outer periphery of the second internally threaded member 54 , thereby constituting a fitted portion 53 that fits with a rotation restricting portion 57 (fitting portion) described later.

[0043] The second internal thread component 54 is provided separately from the first internal thread component 41. The second internal thread component 54 has a cylindrical portion 54a extending in the direction of the axis L and is accommodated in the guide portion 52. A second threaded hole 55 penetrating in the direction of the axis L is formed at the center of the cylindrical portion 54a, and a second internal thread 56 is formed on the inner peripheral surface of the second threaded hole 55. The second internal thread 56 is threadedly engaged with the external thread 64 in the same manner as the first internal thread 51 described above. In this way, the internal thread component 40 is configured to have a first internal thread component 41 and a second internal thread component 54 that are separate from each other, and the first internal thread component 41 and the second internal thread component 54 are respectively threadedly engaged with the external thread component 60 as a driving thread component described later. On the outer peripheral surface of the cylindrical portion 54a of the second internal thread component 54, a rotation limiting portion 57 (fitting portion) is formed over the entire length in the direction of the axis L, thereby defining the outer peripheral shape of the second internal thread component 54. The rotation restricting portion 57 is a portion that restricts the rotation of the second internally threaded member 54 relative to the first internally threaded member 41 around the axis L. Figure 2 As exemplified in (A) to (D) of FIG. 1 , the fitting may be configured in various shapes and fit with the above-mentioned fitted portion 53 .

[0044] For example, Figure 2 As shown in (A), the rotation limiting portion 57 may also be composed of a first surface 57a (D-shaped cut portion, double-sided chamfered portion) along the axis L constituting the outer peripheral surface of the second internal thread component 54 and an arc-shaped second surface 57b (D-shaped cut portion, double-sided chamfered portion) extending around the axis L. That is, the second internal thread component 54 may be double-sidedly chamfered to form a D-shape in top view to serve as the rotation limiting portion 57. In addition, the rotation limiting portion 57 may be as follows Figure 2 As shown in (B), it is composed of a protrusion 57c protruding radially outward from the outer peripheral surface of the second internally threaded member 54, and can also be as shown in Figure 2 As shown in (C), the rotation restricting portion 57 is formed by a concave key groove 57d that is recessed radially inward. In addition, when the rotation restricting portion 57 is formed by the protrusion 57c, a key groove formed by a recessed portion (not shown) corresponding to the protrusion 57c may be provided on the above-mentioned engaged portion 53 side. On the other hand, when the rotation restricting portion 57 is formed by the key groove 57d, as shown in Figure 2 As shown in (C), a protrusion 53a that fits with the key groove 57d may be provided on the side of the fitted portion 53. Figure 2 As shown in (D), the rotation limiting portion 57 may also be composed of a plurality of faces 57e along the axis L, and may be polygonal in plan view. That is, the outer surface of the second internal thread member 54 may also be composed of a polygonal portion. In this case, a hole that is polygonal in plan view is provided on the side of the engaged portion 53, and the rotation limiting portion 57 that is polygonal in plan view is engaged with the hole.

[0045] According to such a structure, the rotation limiting portion 57 is fitted with the fitted portion 53, thereby limiting the rotation of the second internally threaded component 54 around the axis L. That is, the inner periphery of the guide portion 52 is fitted with the outer periphery of the second internally threaded component 54 so as not to rotate relative to each other around the axis L. In addition, the rotation limiting portion 57 is configured to be in sliding contact with the fitted portion 53 in the direction of the axis L, thereby guiding the second internally threaded component 54 in the direction of the axis L. In this way, the second internally threaded component 54 is guided in the direction of the axis L by the guide portion 52, and the inner periphery of the guide portion 52 is fitted with the outer periphery of the second internally threaded component 54 so as not to rotate relative to each other around the axis L. In addition, in the present embodiment, the inner periphery of the guide portion 52 is set as the fitted portion 53, and the rotation limiting portion 57 is provided on the outer periphery of the second internally threaded component 54, but on the contrary, the rotation limiting portion 57 may be provided on the guide portion 52 side, and the shape of the outer periphery of the second internally threaded component 54 may be set to follow the shape of the rotation limiting portion 57.

[0046] That is, a rotation restricting portion 57 composed of any one of a first surface 57a and a second surface 57b (D-shaped cut portion, double-sided chamfered portion), a protrusion 57c, a key groove 57d, and a plurality of surfaces 57e (polygonal portion) may be provided on one of the inner periphery of the guide portion 52 and the outer periphery of the second internally threaded member 54, and an engaged portion 53 engaged with the rotation restricting portion 57 may be provided on the other of the inner periphery of the guide portion 52 and the outer periphery of the second internally threaded member 54. In addition, in the above description, it is described that the inner periphery of the guide portion 52 and the outer periphery of the second internally threaded member 54 are engaged in a manner that is not relatively rotatable around the axis L, but in fact, there is a small gap for engagement between the rotation restricting portion 57 and the engaged portion 53, and therefore, due to the amount of this gap, the inner periphery of the guide portion 52 and the outer periphery of the second internally threaded member 54 may slightly rotate relative to each other around the axis L, but this slight relative rotation is included in the "non-relative rotation" in this embodiment.

[0047] like Figure 3 As shown in FIG. 1 , a coil spring 58 (urging mechanism) is disposed between the guide portion 52 and the second internally threaded member 54. Figure 3 (or Figure 7 ) etc. is not recorded as an actual spiral shape, but as a schematic diagram. The end of one side L1 of the coil spring 58 abuts against the end face of the other side L2 of the guide portion 52, and the end of the other side L2 of the coil spring 58 abuts against the end face of one side L1 of the second internal thread component 54. That is, the coil spring 58 is provided between the first internal thread component 41 and the second internal thread component 54, from the end face of the first internal thread component 41 in the direction of the axis L to the end face of the second internal thread component 54 in the direction of the axis L. The coil spring 58 applies force to the first internal thread component 41 and the second internal thread component 54 in the direction of the axis L to separate from each other.

[0048] According to the above structure, the first internal thread component 41 and the second internal thread component 54 are connected in a manner that they cannot rotate relative to each other around the axis L and can move relative to each other in the direction of the axis L, and are urged by the coil spring 58 in the direction of the axis L. In addition, in the present embodiment, the urging mechanism is constituted by the coil spring 58, but it is not limited to this. For example, the urging mechanism can also be constituted by a leaf spring assembly formed by combining leaf springs. In addition, in the above description, it is recorded that the first internal thread component 41 and the second internal thread component 54 are connected in a manner that can move relative to each other in the direction of the axis L, but this "relatively movable" means the following. That is, it means that when a force that overcomes the spring load of the coil spring 58 is generated, the first internal thread component 41 and the second internal thread component 54 "can move relative to each other" in the direction of the axis L by the amount of thread loosening between the first internal thread portion 51 of the first internal thread component 41 and the external thread 64 of the external thread component 60 described later, or the amount of thread loosening between the second internal thread 56 of the second internal thread component 54 and the external thread 64.

[0049] like Figure 1 As shown, the external thread member 60 (driving thread member) is threadedly connected to the internal thread member 40. The external thread member 60 is a driving shaft that is driven to rotate around the axis L by the driving unit 70, and extends along the axis L direction through the first threaded hole 50 and the second threaded hole 55. A magnetic rotor 62 is mounted on the end of one side L1 of the external thread member 60 via a cylindrical bushing 61. The magnetic rotor 62 is formed in a cylindrical shape extending in the axis L direction, and together with the stator coil (not shown) provided on the outside of the above-mentioned housing 30, it constitutes an electric motor, and becomes the driving unit 70 of the valve device 1. The magnetic rotor 62 is driven to rotate, so that it can rotate around the axis L together with the external thread member 60, and can move in the axis L direction. A magnetic protrusion 63 that is a protrusion protruding radially inward is formed on a part of the inner circumferential surface of the magnetic rotor 62. The claw 49 of the slider 48 mentioned above can abut against the magnetic protrusion 63 around the axis L.

[0050] According to this structure, when the magnetic rotor 62 rotates, the slider 48 follows the rotation and rotates around the axis L, and is guided by the guide groove 47 to move to one side L1 or the other side L2. Moreover, if the slider 48 abuts against the upper end of the guide groove 47 or the lower end of the guide groove 47, it cannot rotate further, and the rotation of the magnetic rotor 62 stops. An external thread 64 that is threadedly engaged with the first internal thread 51 and the second internal thread 56 is formed on the outer peripheral surface of the external thread member 60. In this way, the following feed screw mechanism is constructed: the first internal thread 51 and the second internal thread 56 (fixed thread member) are threadedly engaged with the external thread 64 (external thread member 60, driving thread member), and the external thread member 60 is driven to rotate, so that the valve member 80 described later moves forward and backward along the axis L direction.

[0051] A flange portion 65 protruding radially outward is formed at the lower end of the external thread member 60, and the external thread member 60 is connected to the valve member 80 via the flange portion 65. The valve member 80 includes a valve holder 81 connected to the flange portion 65, and a needle valve 86 connected to the valve holder 81. The valve holder 81 is formed in a cylindrical shape and extends in the direction of the axis L. The outer diameter of the valve holder 81 is formed to be slightly smaller than the inner diameter of the holder guide hole 45, so that the outer peripheral surface of the valve holder 81 can slide on the inner peripheral surface of the holder guide hole 45. A mounting hole 82 penetrating in the direction of the axis L is formed in the wall portion of one side L1 of the valve holder 81, and the lower end of the external thread member 60 including the flange portion 65 is inserted into the mounting hole 82. In addition, an annular gasket 83 is provided between the inner surface of the wall portion of the one side L1 of the valve holder 81 and the end surface of the one side L1 of the flange portion 65.

[0052] A columnar spring support 84 is provided inside the valve support 81. The end surface of one side L1 of the spring support 84 abuts against the end surface of the other side L2 of the gasket 83. A spring 89 is provided around the spring receiving portion 84 to cover the spring receiving portion 84 in the circumferential direction. The end of one side L1 of the spring 89 abuts against the end surface of the other side L2 of the spring receiving portion 84, and the end surface of the other side L2 of the spring 89 abuts against the end surface of one side L1 of the flange 87 described later. According to this structure, the needle valve 86 is urged toward the other side L2. The end of the other side L2 of the valve support 81 opens in the direction of the axis L, and an annular anti-slip component 85 is fixed to the opening. The needle valve 86 includes a flange 87 and a needle portion 88. The flange 87 is located inside the valve support 81, and the end surface of the other side L2 thereof abuts against the end surface of one side L1 of the anti-slip component 85 when the needle portion 88 is not seated on the valve seat portion 15. The needle 88 is formed in a cylindrical shape and extends into the valve chamber 11 along the axis L through the valve guide hole 18a of the valve guide member 18. The end of the needle 88 on the other side L2 is formed in a substantially conical shape with a decreasing diameter toward the other side L2.

[0053] Next, the assembly of the internal thread member 40 and the external thread member 60 in the valve device 1 will be described. Figure 4 (A) to (D) are schematic diagrams showing the assembly procedure of the valve device 1 . Figure 5 (E) to (G) are the assembly sequence of the valve device 1. Figure 4 The following is a schematic diagram of the sequence after the sequence shown in (D). First, Figure 4 (A) As shown, the other side L2 is located Figure 4 The first internal thread component 41 is arranged toward the upper side of the Figure 4As shown in FIG. 4(B), the coil spring 58 is inserted into the first internally threaded component 41 from the bracket guide hole 45 side and arranged in the guide portion 52, and then the second internally threaded component 54 is inserted into the first internally threaded component 41. In addition, at this time, the second internally threaded component 54 is urged toward the other side L2 by the force of the coil spring 58, so that the second internally threaded component 54 is not arranged in the guide portion 52 only by inserting the second internally threaded component 54 into the first internally threaded component 41. Therefore, as shown in FIG. 4(C), the second internally threaded component 54 is pressed into the guide portion 52 using the first pressing jig 45a in the shape of a rod extending in the direction of the axis L.

[0054] Specifically, the external thread 45b formed at the end of one side L1 of the first pressing fixture 45a is threadedly coupled with the second internal thread 56 of the second internal thread component 54 so that the first pressing fixture 45a and the second internal thread component 54 become one, and in this state, the second internal thread component 54 is pressed toward one side L1. As a result, the rotation limiting portion 57 of the second internal thread component 54 is engaged with the engaged portion 53 of the guide portion 52, and the second internal thread component 54 is located in the guide portion 52. In addition, in this state, a second pressing fixture 45c is provided to limit the displacement of the second internal thread component 54 toward the other side L2. Figure 4 As shown in (C), the second pressing jig 45c is formed by bending a metal material into a U-shape, and the two front ends are respectively inserted into a pair of jig insertion holes 45d that penetrate the bracket guide hole 45. When the second pressing jig 45c is inserted into the jig insertion holes 45d, as shown in FIG. Figure 4 As shown in (D), even if the second internal thread member 54 attempts to displace to the other side L2, the second internal thread member 54 is restricted from displacement by contact with the second pressing jig 45c.

[0055] Therefore, after the second pressing jig 45c is inserted into the jig insertion hole 45d, the first pressing jig 45a can be removed from the second internal thread member 54. Figure 5 As shown in (E), the external thread member 60 integrated with the valve member 80 is connected to the internal thread member 40 via the flange portion 65. First, the end portion of one side L1 of the external thread member 60 is located Figure 5 The external thread component 60 is arranged on the lower side of the outer thread component 60 and is close to the internal thread component 40 along the axis L. Then, the external thread 64 of the external thread component 60 is threadedly engaged in the order of the second internal thread 56 and the first internal thread 51, as shown in FIG. Figure 5 As shown in (F), the external thread component 60 is moved to the side L1 until the end of the side L1 of the external thread component 60 protrudes to the side L1 of the internal thread component 40, and the side L1 of the valve bracket 81 is partially received in the bracket guide hole 45. After the external thread component 60 is installed on the internal thread component 40, as shown in Figure 5As shown in (G), the second pressing jig 45c is pulled out from the jig insertion hole 45d. Thus, the assembly of the internal thread member 40 and the external thread member 60 in the valve device 1 is completed.

[0056] Next, the operation of the valve device 1 will be described. In the valve device 1 configured as described above, when the electric motor of the driving unit 70 is driven, the magnetic rotor 62 rotates around the axis L, and the feed screw mechanism feeds the external thread 64, thereby the magnetic rotor 62 and the external thread member 60 move forward and backward in the direction of the axis L. And, as the external thread member 60 moves forward and backward, the valve member 80 moves forward and backward in the direction of the axis L. As a result, for example, Figure 1 As shown in FIG. 1 , the needle 88 moves (separates) from the state of being seated (or closest) to the valve seat 15 to one side L1, and the opening of the second port 14 becomes larger. As a result, the flow rate of the fluid flowing in the primary joint pipe 13, the first port 12, the valve chamber 11, the second port 14, and the secondary joint pipe 16a becomes larger. In addition, at this time, as Figure 3 As shown, the first internal thread component 41 and the second internal thread component 54 are forced in a direction away from each other in the direction of the axis L. Therefore, the internal thread component 40 (the first internal thread component 41, the second internal thread component 54) and the external thread component 60 can slide relative to each other without a gap in the direction of the axis L, and the load generated by the force in the direction of the axis L can always act on the sliding part of the internal thread component 40 and the external thread component 60.

[0057] Furthermore, if the magnetic rotor 62 is rotated in the opposite direction from this state, the feed screw mechanism feeds the external thread 64, so that the magnetic rotor 62 and the external thread member 60 move to the other side L2, and the needle portion 88 is seated on the valve seat portion 15. As a result, the second port 14 is closed. In addition, in the present embodiment, when the needle portion 88 is displaced to the state closest to the other side L2, the needle portion 88 is seated on the valve seat portion 15 and the second port 14 is closed, but it is not limited to this, and this structure can also be applied to a normally open valve device 1 in which the needle portion 88 is close to the valve seat portion 15 but is not seated.

[0058] Next, based on Fig.10 The refrigeration cycle system 100 of the present invention will be described. Fig.10 FIG. 1 is a schematic diagram showing an example of a refrigeration cycle system of the present invention. Fig.10In the figure, reference numeral 1 is an expansion valve using the valve device 1 (electric valve), reference numeral 200 is an outdoor heat exchanger mounted on an outdoor unit, reference numeral 300 is an indoor heat exchanger mounted on an indoor unit, reference numeral 400 is a flow path switching valve constituting a four-way valve, and reference numeral 500 is a compressor. The valve device 1 (expansion valve), the outdoor heat exchanger 200, the indoor heat exchanger 300, the flow path switching valve 400, and the compressor 500 are connected by conduits as shown in the figure, respectively, to constitute a heat pump type refrigeration cycle. In addition, the accumulator, the pressure sensor, the temperature sensor, etc. are omitted from the figure.

[0059] The flow path of the refrigeration cycle is switched by the flow path switching valve 400 to two types of flow paths during cooling operation and heating operation. Fig.10 As shown by the solid arrow, the refrigerant compressed by the compressor 500 flows from the flow path switching valve 400 into the outdoor heat exchanger 200, and the outdoor heat exchanger 200 functions as a condenser. The liquid refrigerant flowing out of the outdoor heat exchanger 200 flows through the valve device 1 as an expansion valve into the indoor heat exchanger 300, and the indoor heat exchanger 300 functions as an evaporator. On the other hand, during the heating operation, as shown in FIG. Fig.10 As shown by the dotted arrow, the refrigerant compressed by the compressor 500 circulates from the flow switching valve 400 in sequence through the indoor heat exchanger 300, the valve device 1 serving as an expansion valve, the outdoor heat exchanger 200, and the compressor 500, the indoor heat exchanger 300 functions as a condenser, and the outdoor heat exchanger 200 functions as an evaporator.

[0060] As described above, according to the above-mentioned embodiment, the first internal thread component 41 (first component) and the second internal thread component 54 (second component) of one of the internal thread component 40 (fixed thread component) and the external thread component 60 (driving thread component) are urged to each other in the direction of the axis L by the coil spring 58 or the leaf spring assembly (urging mechanism). Therefore, the internal thread component 40 and the external thread component 60 can slide against each other without a gap in the direction of the axis L, and the load generated by the force in the direction of the axis L can always act on the sliding part of the internal thread component 40 and the second internal thread component 54. Moreover, the above-mentioned load can be used to generate sliding resistance between the internal thread component 40 and the external thread component 60, thereby reducing vibration and noise when the drive unit 70 rotates.

[0061] In addition, according to this structure, the coil spring 58 is provided between the first internal thread component 41 and the second internal thread component 54 whose relative positional relationship is difficult to change in the direction of the axis L due to the threaded connection, and applies force to the first internal thread component 41 and the second internal thread component 54 in the direction of the axis L to separate from each other. Therefore, even if the external thread component 60 is rotated to change the opening of the second port 14 and the valve component 80 is moved forward and backward in the direction of the axis L, the coil spring 58 can be suppressed from expanding and contracting in the direction of the axis L accompanying the forward and backward movement, and there is no need to prepare a space for the expansion and contraction. For example, in Figure 1 In the structure of the valve device 1 of the first embodiment shown in FIG. 1 , if the coil spring 58 is replaced by the coil spring 58 as in the above-mentioned patent document 1 Figure 1 In the case where the outer shell 30 is disposed between the upper end of the male threaded member 60 and the lower surface of the upper end of the housing 30 and applies force to the other side L2, it is necessary to consider the space for the expansion and contraction of the coil spring 58 and extend the housing 30 in the direction of the axis L, thereby increasing the total length of the valve device 1. However, in this structure, since the coil spring 58 applies force to the first female threaded member 41 and the second female threaded member 54 in the direction of separation from each other between the first female threaded member 41 and the second female threaded member 54, it is not necessary to increase the total length of the valve device 1. Therefore, it can contribute to the space saving of the valve device 1. In addition, as described above, since the coil spring 58 is suppressed from expanding and contracting in the direction of the axis L as the valve member 80 moves forward and backward, for example, even if the opening of the second port 14 changes, the load in the direction of the axis L generated by the coil spring 58 can be always constant, so that the effect of reducing the above-mentioned vibration and noise can be stably maintained. Therefore, in the valve device 1 that can reduce the vibration and noise when the drive unit 70 rotates, it is possible to achieve space saving, and the state of reducing the vibration and noise when the drive unit 70 rotates can be stably maintained. Furthermore, as described above, the coil spring 58 can be provided particularly from the end surface of the first internally threaded member 41 in the direction of the axis L to the end surface of the second internally threaded member 54 in the direction of the axis L.

[0062] In addition, according to the present embodiment, the inner circumference of the guide portion 52 is fitted with the outer circumference of the cylindrical portion 54a of the second internally threaded member 54 over the entire length of the cylindrical portion 54a in the direction of the axis L, so that the entire circumference of the second internally threaded member 54 around the axis L is surrounded by the first internally threaded member 41 over the entire length in the direction of the axis L. Therefore, the first internally threaded member 41 and the second internally threaded member 54 can be connected more reliably in a manner that they cannot rotate relative to each other around the axis L and can move relative to each other in the direction of the axis L. In addition, according to this structure, the cylindrical portion 54a of the second internally threaded member 54 is guided by the guide portion 52 over the entire length in the direction of the axis L, so that the inclination of the second internally threaded member 54 with respect to the direction of the axis L can be suppressed compared to a structure in which a part of the entire length of the cylindrical portion 54a in the direction of the axis L is guided by the guide portion 52. Therefore, it is possible to avoid a situation in which the sliding resistance between the internally threaded member 40 and the externally threaded member 60 is unexpectedly increased due to the inclination of the second internally threaded member 54, thereby causing malfunction.

[0063] In addition, according to the present embodiment, the rotation limiting portion 57 (fitting portion) is composed of various shapes such as a first surface 57a (D-shaped cut portion, double-sided chamfered portion) and a second surface 57b (D-shaped cut portion, double-sided chamfered portion), a protrusion 57c, a keyway 57d and a plurality of surfaces 57e (polygonal portion), so that the rotation limiting portion 57 is fit into the fitted portion 53, and the first internal thread component 41 and the second internal thread component 54 can be connected in a manner that they cannot rotate relative to each other around the axis L and can move relative to each other in the direction of the axis L.

[0064] According to the present embodiment, the present invention can be applied to a structure in which the first female thread member 41 and the second female thread member 54 constitute a fixed thread member and the driving thread member is the male thread member 60 .

[0065] In addition, according to the present embodiment, in the electric valve in which the drive unit 70 is provided with an electric motor, vibration and noise when the drive unit 70 rotates can be reduced. In addition, in the present embodiment, the electric valve is illustrated as an example of the valve device 1, but the electric valve also includes, for example, an electronic expansion valve that opens and closes (or approaches and separates) the second port 14 by a stepping motor. In addition, the valve device 1 is not limited to the electric valve, and may be an electromagnetic valve that uses an electromagnetic coil to move the plunger forward and backward, or a manual valve that manually moves the valve member 80.

[0066] Furthermore, according to the present embodiment, the refrigeration cycle system 100 can be configured using the valve device 1 that can reduce vibration and noise when the driving unit 70 rotates.

[0067] Next, a second embodiment of the present invention will be described. Figure 6 It is a longitudinal sectional view of the valve device 2 according to the second embodiment cut along the axis L of the needle portion 88 . Figure 7Yes Figure 6 FIG. 2 is an enlarged and simplified cross-sectional view of the main part of the valve device 2 of the second embodiment. The valve device 2 includes a valve body 10'. A valve guide portion 18' is formed in the valve body 10'. The valve guide portion 18' is formed in a columnar shape and extends from the central portion of the upper wall of the valve body 10' to one side L1. The valve guide portion 18' is equivalent to the valve guide member 18 of the first embodiment, but is different from the valve guide member 18 in that it is formed integrally with the valve body 10'. A valve guide hole 18a is formed in the center of the valve guide portion 18', and the needle portion 88 of the valve member 80 is inserted into the valve guide hole 18a. A support recess 18b that opens to one side L1 is formed in the center of the upper end portion of the valve guide portion 18'. The end portion of the other side L2 of the external thread member 60' described later is inserted and fixed in the support recess 18b. That is, in the second embodiment, the external thread member 60' is fixed to the valve body 10 to constitute a fixed thread member.

[0068] The support member 20 is assembled on the outer peripheral surface of the valve guide 18', and the housing 30 is fixed to the opening edge of the support member 20. In the second embodiment, the center of the bottom of the housing 30 (at Figure 6 A support shaft 31 protruding toward the other side L2 along the axis L is mounted on the portion of the valve device 1 (corresponding to the upper end portion of the valve device 1). A guide 32 having a spiral groove formed on the outer peripheral surface of the support shaft 31 is formed. A slider 33 engaged with the spiral groove is provided on the guide 32. A claw 34 protruding toward the radial outside is formed on the slider 33, and the claw 34 abuts against the magnetic protrusion 63' of the magnetic rotor 62' around the axis L. In addition, in the second embodiment, the magnetic protrusion 63' is formed to extend from the end of the one side L1 of the magnetic rotor 62' toward the one side L1.

[0069] The external thread component 60' of the second embodiment is formed into a cylindrical shape extending in the direction of the axis L. An external thread 64 is formed on the outer peripheral surface of the external thread component 60'. A drive shaft 66 extending in the direction of the axis L and a valve component 80 are inserted into the interior of the external thread component 60'. The drive shaft 66 extends in the direction of the axis L, and its end on one side L1 protrudes from the external thread component 60' to the one side L1. The valve component 80 includes: a cylindrical main body 87', which abuts against the end on the other side L2 of the drive shaft 66; and a needle 88, which is continuous with the main body 87' and extends into the valve chamber 11 in the direction of the axis L through the valve guide hole 18a. In addition, the internal thread component 40' is threadedly connected to the external thread component 60'. The internal thread component 40' includes a first internal thread component 41' (first component) and a second internal thread component 54' (second component).

[0070] The first internal thread component 41' is formed in a bottomed cylindrical shape and is open to the other side L2. The outer peripheral surface of the first internal thread component 41' is fixed to the inner peripheral surface of the magnetic rotor 62', thereby the first internal thread component 41' and the magnetic rotor 62' are integrated. A first internal thread 51' is formed on the inner peripheral surface of the first internal thread component 41', and the first internal thread 51' is threadedly engaged with the external thread 64. A through hole 41b' is formed in the center of the bottom wall 41a' of the first internal thread component 41' and passes through the axis L direction. The end of the one side L1 of the drive shaft 66 is inserted into the through hole 41b'. In addition, the first internal thread component 41' is connected to the drive shaft 66 by a connecting component 90. The connecting component 90 includes: a first support portion 91, which is arranged on the other side L2 of the bottom wall 41a' of the first internal thread component 41'; and a second support portion 94, which is arranged on the one side L1 of the bottom wall 41a' of the first internal thread component 41'. The first support portion 91 includes a cylindrical portion 92 that is fixed to the drive shaft 66 so as to be rotatable about the axis L and circumferentially covers the drive shaft 66 , and a flange 93 that protrudes in the radial direction from an end portion on one side L1 of the cylindrical portion 92 .

[0071] A spring 89' is provided between the end surface of the other side L2 of the cylinder 92 and the end surface of the one side L1 of the main body 87' in the valve member 80, thereby urging the valve member 80 to the other side L2. The end surface of the one side L1 of the flange 93 abuts against the end surface of the other side L2 of the bottom wall 41a' of the first internally threaded member 41'. The second support portion 94 covers the end of the one side L1 of the drive shaft 66 in the circumferential direction and is formed in a disk shape, and is fixed to the drive shaft 66 in a manner that is non-rotatable around the axis L. The end surface of the other side L2 of the second support portion 94 abuts against the end surface of the one side L1 of the bottom wall 41a' of the first internally threaded member 41'. In this way, the flange 93 of the first support portion 91 and the second support portion 94 sandwich the bottom wall 41a' in the direction of the axis L, so that the first internally threaded member 41' and the magnetic rotor 62' are connected to the connecting member 90 and the drive shaft 66 in a manner that is relatively rotatable around the axis L.

[0072] The second internal thread component 54' is provided separately from the first internal thread component 41' and is formed into a cylindrical shape, and is housed in a guide portion 52' formed by a portion of the inner circumferential surface of the magnetic rotor 62'. A second internal thread 56' is formed in the center of the second internal thread component 54', and the second internal thread 56' is threadedly connected to the external thread 64. A coil spring 58 is arranged between the first internal thread component 41' and the second internal thread component 54'. The end of one side L1 of the coil spring 58 abuts against the end surface of the other side L2 of the first internal thread component 41', and the end of the other side L2 of the coil spring 58 abuts against the end surface of one side L1 of the second internal thread component 54'. As a result, Figure 7As shown, the coil spring 58 urges the first internally threaded member 41 ′ and the second internally threaded member 54 ′ in directions away from each other along the axis L direction.

[0073] In the valve device 2 thus constructed, when the electric motor of the driving unit 70 is driven, the magnetic rotor 62' rotates around the axis L, and the feed screw mechanism feeds the internal thread component 40' (the first internal thread component 41', the second internal thread component 54') threadably, so that the magnetic rotor 62' and the internal thread component 40' move forward and backward along the axis L direction. And, with this forward and backward movement, the connecting component 90 and the drive shaft 66 move forward and backward along the axis L direction. And, with the forward and backward movement of the drive shaft 66, the valve component 80 moves forward and backward, and the opening of the second port 14 changes. In this way, in the second embodiment, the internal thread component 40' constitutes a driving thread component, and the driving thread component has a first component and a second component. And, as described above, the external thread component 60' constitutes a fixed thread component. According to such a second embodiment, the present invention can also be applied to a structure in which the first internal thread component 41' and the second internal thread component 54' constitute a driving thread component and the external thread component 60' is set as a fixed thread component, and the same action and effect as the first embodiment can be achieved.

[0074] Next, a third embodiment of the present invention will be described. Figure 8 It is a longitudinal sectional view of the valve device 3 according to the third embodiment cut along the axis L of the needle portion 88 . Fig. 9 yes Figure 8 The main part of the valve device 3 of the third embodiment is enlarged and sectional view. The valve device 3 of the third embodiment includes an external thread component 600 and an internal thread component 700. The external thread component 600 is equivalent to the external thread component 60' of the second embodiment, and the internal thread component 700 is equivalent to the internal thread component 40' of the second embodiment. The structure other than the external thread component 600 and the internal thread component 700 is the same as that of the second embodiment, so the description thereof is omitted or simplified. Fig. 9 As shown, the external thread component 600 includes a first external thread component 601 (first component) and a second external thread component 604 (second component). That is, in the third embodiment, the fixed thread component side includes a first component and a second component. The first external thread component 601 is formed into a cylindrical shape extending in the direction of the axis L. A first external thread 602 is formed on the outer peripheral surface of the first external thread component 601, and the first external thread 602 is threadedly connected with the internal thread 701 of the internal thread component 700 described later. A first recessed portion 603 that is recessed toward one side L1 is formed on the inner peripheral surface of the other side L2 of the first external thread 602.

[0075] The second external thread component 604 is formed into a cylindrical shape extending in the direction of the axis L. The end of the other side L2 of the second external thread component 604 is inserted and fixed to the support recess 18b of the valve guide 18' of the valve body 10'. A second external thread 605 is formed on the outer peripheral surface of the second external thread component 604, and the second external thread 605 is threadedly engaged with the internal thread 701 of the internal thread component 700. A second recess 606 is formed on the inner peripheral surface of the one side L1 of the second external thread component 604, which is recessed toward the other side L2. A coil spring 58 is provided between the first recess 603 and the second recess 606. The end of the one side L1 of the coil spring 58 abuts against the bottom surface of the first recess 603, and the end of the other side L2 of the coil spring 58 abuts against the bottom surface of the second recess 606. As a result, the coil spring 58 applies force to the first external thread component 601 and the second external thread component 604 in a direction away from each other along the axis L.

[0076] The first external thread component 601 and the second external thread component 604 are connected by a rotation-stopping mechanism 607 in a manner that they cannot rotate relative to each other around the axis L and can move in the direction of the axis L. Various structures can be used for the structure of the rotation-stopping mechanism 607. For example, a protrusion protruding toward the other side L2 may be provided at the end of the other side L2 of the first external thread component 601, two protrusions protruding toward the one side L1 may be provided at the end of the one side L1 of the second external thread component 604, and a protrusion may be sandwiched between the two protrusions to form the rotation-stopping mechanism 607. On the other hand, two protrusions protruding toward the other side L2 may be provided at the end of the other side L2 of the first external thread component 601, a protrusion protruding toward the one side L1 may be provided at the end of the one side L1 of the second external thread component 604, and a protrusion may be sandwiched between the two protrusions to form the rotation-stopping mechanism 607.

[0077] In addition, a convex portion protruding in the direction of the axis L may be provided on one of the end of the other side L2 of the first external thread member 601 and the end of the one side L1 of the second external thread member 604, and a concave portion recessed in the direction of the axis L may be provided on the other side, and a rotation stop mechanism 607 may be formed by fitting the concave and convex portions. In addition, there is no particular limitation on the number and arrangement of the protrusions, convex portions, and concave portions. For example, two sets of rotation stop mechanisms 607 composed of convex portions and concave portions may be provided and arranged at positions separated by 180° around the axis L. The internal thread member 700 is formed in a bottomed cylindrical shape and is open to the other side L2. The outer peripheral surface of the internal thread member 700 is fixed to the inner peripheral surface of the magnetic rotor 62', thereby the internal thread member 700 and the magnetic rotor 62' are integrated. An internal thread 701 is formed on the inner peripheral surface of the internal thread member 700, and the internal thread 701 is threadedly engaged with the first external thread 602 and the second external thread 605. According to the third embodiment, the present invention can also be applied to a structure in which the first external thread member 601 and the second external thread member 604 constitute a fixed thread member and the driving thread member is set as an internal thread member 700, and the same operation and effect as the first and second embodiments can be achieved.

[0078] The first embodiment, the second embodiment, and the third embodiment are described in detail above with reference to the accompanying drawings, but the specific structures are not limited to these embodiments, and changes in the design that do not deviate from the main purpose of the present invention are also included in the present invention. For example, in the above-mentioned first embodiment, the first internal thread component 41 and the second internal thread component 54 constitute a fixed thread component, and the external thread component 60 constitutes a driving thread component. However, this is not limited to this, and the first internal thread component 41 and the second internal thread component 54 serving as the fixed thread component may be concentrated into one, and the external thread component 60 serving as the driving thread component may be divided into two. Specifically, the first internal thread component 41 and the second internal thread component 54 serving as the fixed thread component may be omitted. Figure 1 The second internally threaded component 54 shown is a fixed threaded component composed only of the first internally threaded component 41 .

[0079] And, Figure 1The external thread component 60 shown is divided into a first external thread component fixed to the magnetic rotor 62 to constitute the L1 part on one side and a second external thread component connected to the valve component 80 to constitute the L2 part on the other side, so that the first external thread of the first external thread part and the second external thread of the second external thread part are respectively threadedly engaged with the internal thread 56 of the first internal thread component 41. In addition, a coil spring 58 is interposed between the first external thread component and the second external thread component, so that the first external thread component and the second external thread component are integrated. In this way, the first external thread component and the second external thread component constitute a driving thread component. In this structure, if the electric motor of the driving part 70 is driven, the magnetic rotor 62 rotates around the axis L, and the feed screw mechanism feeds the first external thread component and the second external thread component respectively, so that the magnetic rotor 62, the first external thread component and the second external thread component move forward and backward together along the axis L direction. In addition, with this forward and backward movement, the valve component 80 approaches or leaves the second port 14, and the opening of the second port 14 changes.

[0080] In this way, the present invention can also be applied to a structure in which the fixed thread component is set as the first internal thread component 41, and the driving thread component is set as the first external thread component and the second external thread component. In short, one of the fixed thread component and the driving thread component is constituted to have a first component and a second component that are separated from each other, and the first component and the second component are respectively threadedly connected to the other of the fixed thread component and the driving thread component. In addition, in the first embodiment, the coil spring 58 and the like are arranged between the first internal thread component 41 and the second internal thread component 54, and the coil spring 58 and the like are used to apply force to the first internal thread component 41 and the second internal thread component 54 in the direction of the axis L, but it is not limited to this structure, and the force applying mechanism such as the coil spring 58 can be used in various configurations as long as it is a structure that can apply force to the first internal thread component 41 and the second internal thread component 54 in the direction of the axis L.

Claims

1. A valve device, comprising: a valve body having a valve chamber therein; a fixed screw member supported by the valve body; a drive screw member driven to rotate by a drive unit; and a valve member connected to the drive screw member. The valve device is characterized in that The feed screw mechanism is configured as follows: the fixed screw member is threadedly coupled to the driving screw member, and the driving screw member is driven to rotate, thereby causing the valve member to move forward and backward in the axial direction. One of the fixing screw component and the driving screw component is configured to include a first component and a second component that are separate from each other, and the first component and the second component are respectively threadedly connected to the other of the fixing screw component and the driving screw component. The first member and the second member are connected so as to be non-rotatable relative to each other and to be movable relative to each other in the axial direction, and are urged in the axial direction by an urging mechanism.

2. The valve device according to claim 1, characterized in that The urging mechanism is provided between the first member and the second member, and urges the first member and the second member in directions away from each other in the axial direction.

3. The valve device according to claim 2, characterized in that The urging mechanism is provided from an end surface of the first member in the axial direction to an end surface of the second member in the axial direction.

4. The valve device according to claim 1, characterized in that The urging mechanism is a coil spring or a leaf spring assembly formed by combining leaf springs.

5. The valve device according to claim 1, characterized in that The first member has an internal thread portion and a guide portion in a cylindrical interior, the second member is guided by the guide portion in the axial direction, and the inner periphery of the guide portion and the outer periphery of the second member are fitted so as to be non-rotatable relative to each other around the axis.

6. The valve device according to claim 5, characterized in that An engaging portion consisting of any one of a D-shaped cut portion, a double-sided chamfered portion, a protrusion, a keyway and a polygonal portion is provided on one of the inner periphery of the guide portion and the outer periphery of the second component, and an engaged portion engaged with the engaging portion is provided on the other of the inner periphery of the guide portion and the outer periphery of the second component.

7. The valve device according to claim 1, characterized in that The fixing threaded component comprises the first component and the second component. The first component is a first internally threaded component having a first internal thread and fixed to the valve body. The second component is a second internal thread component having a second internal thread, The driving screw member is an externally threaded member having an external thread threadably coupled to the first internal thread and the second internal thread.

8. The valve device according to claim 1, characterized in that The fixed threaded component is an internal threaded component having an internal thread and fixed to the valve body. The driving screw component has the first component and the second component, The first component is a first externally threaded component having a first external thread threadedly coupled to the internal thread, The second component is a second externally threaded component having a second external thread threadedly coupled to the internal thread.

9. The valve device according to claim 1, characterized in that The fixed threaded component is an external threaded component having an external thread and fixed to the valve body. The driving screw component has the first component and the second component, The first component is a first internal thread component having a first internal thread threadedly coupled to the external thread, The second component is a second internally threaded component having a second internal thread threadedly coupled to the external thread.

10. The valve device according to claim 1, characterized in that The fixing threaded component comprises the first component and the second component. The first component is a first externally threaded component having a first external thread and fixed to the valve body. The second component is a second externally threaded component having a second external thread, The driving screw member is an internal screw member including an internal screw threadedly coupled to the first external screw thread and the second external screw thread.

11. An electric valve, characterized in that ， The driving unit in the valve device according to any one of claims 1 to 10 includes an electric motor.

12. A refrigeration cycle system, characterized in that: A motor-driven valve according to claim 11 is provided.

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