Valve device

Abstract

To provide a valve device capable of suppressing noise while suppressing increase in a size of a whole device.SOLUTION: A joint member 10 is not protruded to a valve chest 2A, thus suppressing an uneven flow of the fluid in the valve chest 2A when fluid flows from the joint member 10 into the valve chest 2A, suppressing a flow velocity difference and a pressure difference, and suppressing noise resulting from the vibration of a motor valve 1 and the passing sound of fluid. Areas of parts A1, A2 are each made larger than an inside cross section area of the joint member 10, thus stabilizing the flow of the fluid without restricting the fluid flowing from the joint member 10 into the valve chest 2A, and suppressing noise. The joint member 10 is not protruded to the valve chest 2A, thus easily making the passing cross section areas A1, A2 larger, and suppressing increase in the size of the whole device.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a valve device. [Background technology]

[0002] Conventionally, a valve device has been provided in which a porous body made of foam metal is arranged along the inner wall surface of a valve body. An electrically operated valve has been proposed (see, for example, Patent Document 1). The conduit joint is attached to the porous body by cutting out a portion of the porous body corresponding to the opening. , and aims to reduce abnormal noise. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-087642 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the motor-operated valve described in Patent Document 1, the space for disposing the porous body is This requires a large amount of pressure, which makes the entire motor-operated valve large. When miniaturized, the flow path becomes narrower regardless of whether a porous body is present or not, causing uneven fluid flow. Fluid with such an uneven flow passing through the valve port can easily cause noise. In other words, it is necessary to achieve both the miniaturization of the entire device and the suppression of noise. It was difficult to do so.

[0005] An object of the present invention is to provide a valve that can suppress the size of the entire device and reduce noise. The object of the present invention is to provide an apparatus. [Means for solving the problem]

[0006] The valve device of the present invention comprises a cylindrical valve housing having an opening formed on a side surface thereof, and a valve body provided in a valve chamber inside the valve housing; a valve port to which the valve body approaches or moves away; a cylindrical coupling member that is inserted into the opening and connected to the valve housing; A valve device, wherein an end surface of the coupling member that is inserted into the valve housing is The inner circumferential surface of the housing is in contact with a virtual inner circumferential surface that is virtually extended to the opening, or the virtual inner circumferential surface is in contact with the virtual inner circumferential surface that is virtually extended to the opening. The valve member is disposed outside the inner circumferential surface of the valve body, and the fluid flows between the coupling member and the valve port. In a flow path passing through the chamber, a cross section including the central axes of both the valve housing and the coupling member is provided. The valve body is perpendicular to the central axis of the valve housing and passes through the valve body. The smallest passable area among the cross sections is larger than the inner cross-sectional area of ​​the coupling member. It is a sign.

[0007] According to the present invention as described above, the end face of the coupling member is in contact with the imaginary inner peripheral surface of the valve housing. or is disposed outside the imaginary inner peripheral surface, so that the coupling member protrudes into the valve housing. This prevents the fluid from flowing into the valve chamber from entering the valve chamber. Therefore, it is possible to suppress unevenness in the flow of the air, and to suppress differences in flow velocity and pressure. It is possible to suppress noise caused by vibration of the valve device and the passing sound when the fluid passes through the valve port. In addition, the cross section including the central axes of both the valve housing and the coupling member can be passed through the valve housing. The smallest possible cross section that is perpendicular to the central axis of the valve housing and passes through the valve body The area is larger than the inner cross-sectional area of ​​the coupling member, so that the flow that flows from the coupling member into the valve chamber The body is not squeezed, the flow of fluid can be stabilized, and noise can be suppressed. Furthermore, since the coupling member does not protrude into the valve housing, the above two types of passage cross-sectional areas can be increased. This makes it easy to adjust the size of the entire device and prevents it from becoming too large.

[0008] In this case, the valve device of the present invention further includes a guide member for guiding the valve body, and the joint portion a fluid passage between the coupling member and the valve port through which the fluid passes the valve chamber; The valve chamber is formed by a valve shaft extending from the valve chamber to the valve housing. The smallest area of ​​the cross section passing through the valve body or the guide member is the inside of the coupling member. With this configuration, the flow from the coupling member into the valve chamber is preferably larger than the cross-sectional area. This makes it easier to prevent the trapped fluid from being squeezed out.

[0009] In this case, in the valve device of the present invention, the inner peripheral surface of the valve housing and the imaginary inner peripheral surface are circular. It is preferable that the joint member extends along the cylindrical surface. The fluid that flows into the valve chamber can flow smoothly along the inner surface of the valve housing. In this case, the side surface of the valve housing is provided with a fitting member. It is more preferable that no openings (for example, openings for sound deadening members) are formed other than the openings in the above. .

[0010] In the valve device of the present invention, the inner diameter of the coupling member is larger than the maximum outer diameter of the valve body. According to this configuration, the flow of the fluid that has flowed into the valve chamber from the coupling member is However, this can make it difficult for the air to be blocked by the valve body, thereby further reducing noise.

[0011] In the valve device of the present invention, the end of the coupling member that is inserted into the valve housing The end surface extends along a plane perpendicular to the central axis of the coupling member, and the entire end surface is It is preferable that the valve be positioned inside the outer circumferential surface of the valve housing. For example, when assembling the coupling member to the valve housing, the direction of the coupling member (centered on the axial direction) There is no need to adjust the rotation angle (the angle of rotation of the joint), which improves assembly efficiency. The end face of the member has a shape that follows the periphery of the opening, so that the coupling member protrudes into the valve housing. In a configuration without a center axis, the direction of the joint member needs to be adjusted. Along a vertical plane, no such adjustment is necessary.

[0012] In the valve device of the present invention, the opening has an insertable portion into which the coupling member can be inserted. The insertion of the coupling member is restricted by protruding toward the inner diameter side at a position inside the insertable portion. According to this configuration, it is preferable that the coupling member has a restricting portion for restricting the movement of the coupling member. This prevents excessive insertion and allows the insertion depth to be set to a predetermined depth. The hand member can be prevented from protruding into the valve housing.

[0013] In the valve device of the present invention, the minimum inner diameter of the restricting portion is equal to or larger than the inner diameter of the coupling member. Furthermore, in the valve device of the present invention, it is preferable that the restricting portion is extended from the insertable portion to the inner diameter side. It is more preferable that the protruding dimension is 50% or less of the wall thickness of the joint member. According to this configuration, when the fluid flows into the valve chamber from the coupling member, the flow is restricted by the restricting portion. This makes it less likely that the sound will be blocked, further reducing noise. [Effects of the Invention]

[0014] According to the valve device of the present invention, the size of the entire valve device can be prevented from increasing and noise can be suppressed. can be done. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a cross-sectional view showing a valve device according to an embodiment of the present invention. [Figure 2] 3 is a cross-sectional view showing a connection portion between a valve housing and a coupling member in the valve device. FIG. [Figure 3] FIG. 3 is a cross-sectional view showing a fluid passage portion in the valve device. [Figure 4] FIG. 3 is a cross-sectional view showing a fluid passage portion in the valve device. [Figure 5] 4 is a cross-sectional view showing a connection portion between a valve housing and a coupling member in a valve device according to a first modified example. FIG. [Figure 6] FIG. 10 is a cross-sectional view showing a fluid passage portion in a valve device according to a second modified example. [Figure 7] FIG. 10 is a cross-sectional view showing a fluid passage portion in a valve device according to a third modified example. [Figure 8] FIG. 10 is a cross-sectional view showing a fluid passage portion in a valve device according to a third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0016] An embodiment of the present invention will be described with reference to the drawings. Valves used in the refrigeration cycle systems of air conditioners such as cage air conditioners and room air conditioners The device comprises a valve housing 2, a valve body 3, a valve holder 4, a support member 5, and a step and a pinion motor 6.

[0017] The valve housing 2 is formed in a cylindrical shape with an open top, and the valve body is placed inside the valve chamber 2A. The valve housing 2 accommodates the valve body 3 and the valve holder 4. The valve housing 2 has a cylindrical side portion 27 and a side portion 2 and a bottom surface portion 28 provided at one end of the cylindrical side surface portion 27 (the lower end in FIG. 1). The inner surface 272 has an inner peripheral surface S1. 72 has a shape with an expanded diameter at the upper side, but the inner peripheral surface S1 is not expanded. The inner peripheral surface S1 has a portion, particularly a periphery of the region where the opening 21 is formed. The opening 21 itself is not included. In the following description, the axial direction of the valve housing 2 is defined as the Z direction. The two directions perpendicular to the Z axis are the X and Y directions, respectively. The bottom is based on Figure 1, with the upper side being the valve open side and the lower side being the valve closed side. Side of the valve housing 2 The portion 27 is formed with an opening 21 through which the coupling member 10 communicating with the valve chamber 2A is inserted, and The cylindrical opening 22 is formed in the bottom surface 28 of the cylindrical opening 22. The end of the coupling member 11 extending in the direction of the arrow is inserted and connected, and the valve seat portion 23 is integrally formed. The coupling member 11 is in communication with the valve port 24 of the valve seat portion 23. In this case, no openings other than the opening 21 are formed.

[0018] The valve body 3 is provided at the lower end of the valve holder 4. That is, when the valve body 3 is fitted to the valve holder 4, The valve body 3 is welded and fixed to the valve holder 4, and is suspended from the valve holder 4. The needle valve 31 extends downward from the valve seat portion. The valve port 24 moves toward or away from a periphery 25 of the valve port 24 (described later). In the embodiment, the needle valve 31 can abut against the peripheral edge 25. The portion where the valve 31 comes into contact forms a sealed portion.

[0019] The valve holder 4 is formed in a cylindrical shape extending along the Z direction, and its upper end is The valve holder 4 is engaged with the lower end of a rotor shaft 61 of the motor 6, which will be described later. The rotor shaft 61 is suspended from the rotor and is rotatable relative to the rotor shaft 61. In addition, a compression coil spring 41 is provided in the valve holder 4, and a downward load is applied to the valve body 3. The valve body 3 and the valve holder 4 constitute the valve body 20. That is, the term "valve body" includes the valve body main body that moves toward and away from the periphery of the valve port. The valve holder may include a member that moves integrally with the valve body, and may include a member other than the valve holder. Furthermore, the term "valve body" is sufficient as long as it includes at least the valve body itself, and does not include the valve holder or compression coil. It may not have a spring or the like.

[0020] The support member 5 is attached to the valve housing 2 at a flange portion 51 so as to close the upper opening of the valve housing 2. The support member 5 is fixed to the housing 2. The support member 5 accommodates the valve holder 4 and is rotatable in the Z direction. The guide recess 52 guides the rotor shaft 61, and the female screw portion 53 into which the rotor shaft 61 is screwed. and a communication hole 54 that communicates with the space inside a case 62 of the flipping motor 6, which will be described later. The support member 5 has a guide recess 52 that guides the valve holder 4 of the valve body 20. This allows it to function as a guide member.

[0021] The stepping motor 6 includes a rotor shaft 61, a case 62, a magnet rotor 63, and The case 62 is made up of a stator coil 64 and a rotor 66. The rotor 64 is made up of a stator coil 64. A magnetized magnet rotor 63 is rotatably provided. The motor shaft 61 is fixed to the case 62. Furthermore, the case 62 closes the upper opening of the valve housing 2. The stator coil 64 is fixed to the valve housing 2 so as to The stepping motor 6 is provided with a stator coil 64 which receives a pulse signal. By doing so, the magnet rotor 63 is rotated in accordance with the number of pulses.

[0022] The rotor shaft 61 has an outer circumferential surface formed with a male thread 611 that screws into the female thread 53 of the support member 5. When the stepping motor 6 is driven, the magnet rotor 63 and the rotor The shaft 61 rotates, and the screw feed mechanism is made up of the male screw portion 611 and the female screw portion 53. As a result, the rotor shaft 61 moves in the Z direction. The valve body 4 moves in the Z direction while being guided by the guide recess 52 of the support member 5, and the knee of the valve body 3 The valve 31 abuts against or separates from the periphery 25 of the valve port 24 (seated or unseated), When the needle valve 31 comes closest to the periphery 25 of the valve port 24, The needle valve 31 may be configured not to contact the periphery of the valve port 24. The opening degree of the valve port 24 is controlled according to the Z-direction position (lift amount) of the valve 3. The flow rate of the flowing fluid is controlled.

[0023] Here, an opening 21 formed on the side of the valve housing 2 and a valve body inserted into this opening 21 The detailed relationship between the valve housing and the coupling member 10 will be described with reference to FIG. 2 shows a cross section including the central axes L1 and L2 of both the housing 2 and the coupling member 10. The cross section perpendicular to the central axis L1 of the housing 2 (the cross section along the line Z2-Z2 in FIG. 1) is shown. The member 10 is formed in a cylindrical shape extending along the X direction (i.e., the central axis L2 is along the X direction). The opening 21 is formed in a circular shape when viewed from the X direction, corresponding to the outer peripheral surface of the joint member 10. The outer diameter of the joint member 10 is equal to or slightly smaller than the inner diameter of the opening 21 .

[0024] The end surface 101 of the coupling member 10 that is inserted into the valve housing 2 is The inner peripheral surface S1 is in contact with a virtual inner peripheral surface S2 that is a virtual extension of the inner peripheral surface S1 to the opening 21, or the virtual inner peripheral surface S2 In other words, the imaginary inner peripheral surface S2 is arranged along the XY plane as shown in FIG. The cross section is arc-shaped, and the center of the arc is in contact with the end face 101 or The end face 101 is positioned outside (on the right side in FIGS. 1 and 2) from the center of the joint. The hand member 10 does not protrude into the valve chamber 2A in the valve housing 2. Furthermore, the entire end face 101 is The end face 101 is located inside the outer circumferential surface of the valve housing 2. That is, the outer circumferential edge of the end face 101 is located inside the opening 21. In the cross-sectional view of FIG. 2, the imaginary inner peripheral surface S2 is indicated by a broken line. However, on the far side, there exists an inner edge 211 of the opening 21 in the X direction.

[0025] The end surface 101 of the joint member 10 extends along the YZ plane and is It has rotational symmetry (i.e., when the joint part 10 is rotated by an arbitrary angle around the central axis L2, On the other hand, the opening 21 is formed in a cylindrical valve housing. Since the imaginary inner peripheral surface S2 is formed on the side surface of the ring 2, the imaginary inner peripheral surface S2 is in the Z direction similar to the inner peripheral surface S1. It has a three-dimensional shape along a cylindrical curved surface extending in the direction of the axis L1.

[0026] Next, the area of ​​the flow path when the fluid flows from the coupling member 10 into the valve chamber 2A will be described. In the flow path in which the fluid passes through the valve chamber 2A between the coupling member 10 and the valve port 24, Passing portion A1 in a cross section including the central axes L1, L2 of both the housing 2 and the coupling member 10 3 by hatching. In this embodiment, the passage A1 is, for example, a passage between the joint member 10 The upper end of the outer circumferential surface of the joint member is defined as an imaginary extension line of the upper end of the joint member along the X direction. When the fluid flows from the coupling member 10 into the valve chamber 2A, the fluid passes through the inner peripheral surface of the coupling member 10 and is temporarily inserted into the valve chamber 2A. In reality, part of the fluid flows through this extended region. In this embodiment, the thickness of the joint member 10 is also taken into account. The passage area A1 is defined by an extension line of the outer circumferential surface of the pipe. Depending on the thickness of the joint member, an extension line extending from the center of the joint member in the thickness direction may be used. Alternatively, an extension line extending the inner peripheral surface may be used.

[0027] The upper surface of the bottom surface 28 of the valve housing 2 is made up of an annular surface 281 extending along the XY plane and a circular The annular surface 281 is continuous with the inside of the annular surface 281 and gradually increases in size as it approaches the periphery 25 of the valve port 24. and a truncated cone surface 282 extending toward the center. That is, a recess is formed around the periphery 25 of the valve port 24, and the bottom surface of this recess is a circular ring. The recessed portion 281 is located below the lower end of the joint member 10. Furthermore, the passage A1 is located inside the valve housing 2 and is located in the valve body. The space outside the body 3, the valve holder 4, and the support member 5. The area of ​​the passage A1 is It is larger than the inner cross-sectional area of ​​the hand member 10.

[0028] In the flow path through which the fluid passes through the valve chamber 2A between the coupling member 10 and the valve port 24, A cross section perpendicular to the central axis L1 of the valve housing 2 and passing through the valve element 20, through which the fluid can pass. The cross section with the smallest area (cross section along the Z2-Z2 line) and the passage A2 are shown by hatching. 4. In this embodiment, FIG. 4 is a cross section passing through the valve holder 4. In the valve holder 4, the maximum outer diameter is equal to the inner diameter of the guide recess 52. The section A2 is the space inside the valve housing 2 and outside the valve holder 4. The area through which A2 can pass is larger than the inner cross-sectional area of ​​the joint part 10. The inner diameter is larger than the maximum outer diameter of the valve body 20 (ie, the outer diameter of the valve holder 4).

[0029] According to the present embodiment, the coupling member 10 does not protrude into the valve chamber 2A. When the fluid flows into the valve chamber 2A from the valve chamber 0, the flow of the fluid becomes uneven within the valve chamber 2A. Therefore, the vibration and flow of the motor-operated valve 1 can be reduced. The noise caused by the passing sound of the body can be suppressed. , which is larger than the inner cross-sectional area of ​​the coupling member 10, the fluid flows from the coupling member 10 into the valve chamber 2A. The fluid is not throttled, the flow of the fluid can be stabilized, and noise can be suppressed. Furthermore, since the coupling member 10 does not protrude into the valve chamber 2A, the passage cross-sectional areas A1 and A2 can be increased. This makes it easy to adjust the size of the entire device and prevents it from becoming too large.

[0030] The inner peripheral surface of the valve housing 2 and the imaginary inner peripheral surface S2 extend along a cylindrical surface. By this, the fluid that has flowed into the valve chamber 2A from the coupling member 10 contacts the inner circumferential surface of the valve housing 2. It can flow smoothly along the side, further reducing noise. Since the portion 27 does not have any openings other than the opening 21, the fluid flows through the inner periphery of the valve housing 2. It can flow more smoothly along the surface.

[0031] In addition, since the inner diameter of the coupling member 10 is larger than the maximum outer diameter of the valve body 20, The flow of the fluid flowing into the valve chamber 2A from the valve body 3 is less likely to be blocked by the valve body 3. , noise can be further reduced.

[0032] In addition, the end surface 101 of the joint member 10 extends along the YZ plane, When assembling the coupling member 10 to the valve housing 2, the direction of the coupling member 10 (rotation around the X direction) There is no need to adjust the rotation angle, which improves assembly efficiency.

[0033] The present invention is not limited to the above-described embodiment, and any other suitable embodiment may be used as long as the object of the present invention can be achieved. The present invention includes other configurations and the following modifications. In the example, the same components as those in the above embodiment are denoted by the same reference numerals and the description thereof will be omitted. In this embodiment, the inner diameter of the opening 21 is constant, and the coupling member 10 is simply inserted through it. However, as a first modification, as shown in FIG. 5, the opening 26 is provided with a hole through which the coupling member 10 can be inserted. The insertable portion 261 and the inner diameter of the opening 26 on the inside of the insertable portion 261 in the insertion direction a restricting portion 262 that restricts the insertion of the coupling member 10 by protruding to the side, You may do so.

[0034] In the first modification, the inner diameter of the insertable portion 261 is equal to or slightly smaller than the outer diameter of the joint member 10. The minimum inner diameter of the restricting portion 262 is smaller than the outer diameter of the joint member 10. The step formed by the insertable portion 261 and the restricting portion 262 allows , excessive insertion of the coupling member 10 can be restricted, and the insertion depth can be set to a predetermined depth, The coupling member 10 can be prevented from protruding into the valve chamber 2A. It may be formed in a circular shape when viewed from the direction, or may be formed in a shape that partially protrudes inward in the circumferential direction. It may also be something.

[0035] In the first modification, the minimum inner diameter of the restricting portion 262 is equal to or greater than the inner diameter of the coupling member 10. Furthermore, the protrusion dimension of the restricting portion 262 protruding from the insertable portion 261 to the inner diameter side of the opening 26 is L3 is 50% or less of the wall thickness of the coupling member 10. When the fluid flows into A, the flow is less likely to be blocked by the restricting portion 262, and noise is further reduced. can be reduced.

[0036] In the first modified example, the minimum inner diameter of the restricting portion 262 is equal to or larger than the inner diameter of the coupling member 10. The protruding dimension of the restricting portion 262 protruding from the insertable portion 261 to the inner diameter side is However, the relationship between the dimensions is not limited to this. For example, When the wall thickness is small, the protruding dimension may be greater than 50% of the wall thickness, The minimum inner diameter of the restricting portion may be equal to or smaller than the inner diameter of the coupling member. This makes it easier for the restricting portion to lock the coupling member and to restrict over-insertion. do.

[0037] In the above embodiment, the valve body 20 is perpendicular to the central axis L1 of the valve housing 2 and passes through the valve body 20. The area of ​​the passage portion A2, which is the smallest area through which the fluid can pass, is the inner area of ​​the coupling member 10. The cross-sectional area is larger than the cross-sectional area of ​​the valve body. Among them, the one with the smallest fluid passing area may be used. For example, as shown in Figure 1, In the flow path through which the fluid passes through the valve chamber 2A between the coupling member 10 and the valve port 24, The coupling member 10 (including the outer peripheral surface, inner peripheral surface, and central portion in the thickness direction of the coupling member) is inserted into the valve chamber 2A. The support member 5 is included in the virtually extended range, and the support member 5 has an outer diameter larger than that of the valve body 20. In this case, the passing portion may be defined based on a cross section passing through the support member 5. As a modified example, as shown in FIG. 6, a passage portion (support The area of ​​the space A5 outside the member 5 and inside the valve housing is the inner cross-sectional area of ​​the coupling member 10. It may be configured to be larger than this.

[0038] In the above embodiment, the inner diameter of the coupling member 10 is larger than the maximum outer diameter of the valve body 20. However, the dimensions of the joint members and valve body can be appropriately set depending on the purpose of the valve device and the expected flow rate, etc. The inner diameter of the coupling member may be equal to or smaller than the maximum outer diameter of the valve body.

[0039] In the above embodiment, the end surface 101 of the joint member 10 extends along the YZ plane. However, the end surface may extend along a curved surface. Even if the nozzle 21 has a three-dimensional shape along the inner periphery (a shape along the imaginary inner periphery surface S2), Preferably, with this configuration, the outer peripheral surface of the coupling member and the inner peripheral surface of the opening 21 face each other. The area can be increased, and the connection structure can be stabilized. If the worker can grasp the orientation of the joint parts by marking the outer surface of the material, assembly will be easier. In the above embodiment, the entire end surface 101 of the joint member 10 is is located inside the outer peripheral surface of the valve housing 2, but The portion may be located outside the outer circumferential surface of the valve housing.

[0040] In the above embodiment, the end face 101 of the joint member 10 is positioned outside the imaginary inner peripheral surface S2. In the third modified example, the coupling member 10 is positioned so as not to protrude into the valve chamber 2A. As shown in FIG. 1, the end surface 101 of the coupling member 10 intersects with the imaginary inner peripheral surface S2, and the coupling member 10 It may be configured to protrude slightly into the chamber 2A. The passing portion A4 is an area inside the plane S3 along the end face 101. In this modified example, the passages A3 and A4 are both larger than the inner cross-sectional area of ​​the joint member 10. The end face 101 of the joint member 10 is substantially perpendicular to the surface of the joint member 10. If the protrusion amount is such that it intersects with the inner peripheral surface S2, it is easy to increase the area of ​​the passage portions A3 and A4. This makes it possible to prevent the entire device from becoming large.

[0041] In the above embodiment, the motor-operated valve 1 is used as an example of the valve device. The coupling member may be inserted into the opening on the side of the valve housing. For example, the valve device may include a suction element, a plunger, and an electromagnetic valve. a coil, and the plunger is driven by energizing or de-energizing the electromagnetic coil, The valve may be an electromagnetic valve in which a valve element provided on a plunger moves toward or away from a valve port.

[0042] The embodiment of the present invention has been described above in detail with reference to the drawings. The present invention is not limited to these embodiments, and the design may be changed within the scope of the gist of the present invention. etc. are included in the present invention. [Explanation of symbols]

[0043] 1... valve device, 2... valve housing, 21, 26... openings, 24... valve port, 261... insertable Function portion, 262...regulating portion, 2A...valve chamber, 3...valve body main body, 5...support member (guide member), 10... Coupling member, 101... end surface, 20... valve body, S1... inner peripheral surface, S2... imaginary inner peripheral surface

Claims

1. A valve device comprising: a cylindrical valve housing having an opening formed on a side surface; a valve element provided in a valve chamber inside the valve housing; a valve port to which the valve element approaches or moves away; a cylindrical coupling member connected to the valve housing by being inserted through the opening; a stepping motor; and a screw feed mechanism that converts rotational motion generated by the stepping motor to linearly move the valve element, the stepping motor includes a case fixed to the valve housing, a magnet rotor provided within the case, and a stator coil disposed on the outer periphery of the case; an end surface of the coupling member that is inserted into the valve housing intersects with a virtual inner circumferential surface that is a virtual extension of an inner circumferential surface of the valve housing to the opening, and an inner surface of the opening has a region that does not contact the coupling member, a valve device characterized in that, in a flow path through which a fluid passes through the valve chest between the coupling member and the valve port, a passable area in a cross section including the central axes of both the valve housing and the coupling member, and a minimum passable area among cross sections perpendicular to the central axis of the valve housing and passing through the valve disc, are larger than an inner cross-sectional area of ​​the coupling member (excluding a valve device in which a member is provided to partition the valve chest into a space communicated with the coupling member and a space communicated with the valve port).

2. A valve device comprising: a cylindrical valve housing having an opening formed on a side surface; a valve element provided in a valve chamber inside the valve housing; a valve port to which the valve element approaches or moves away; a cylindrical coupling member connected to the valve housing by being inserted through the opening; a stepping motor; and a screw feed mechanism that converts rotational motion generated by the stepping motor to linearly move the valve element, the stepping motor has a magnet rotor, a stator coil, and a rotor shaft fixed to the magnet rotor, the valve element includes a valve holder rotatable about the rotor shaft, a valve element main body that moves toward and away from the valve port, and a compression coil spring that is provided in the valve holder and biases the valve element main body toward the valve port, an end surface of the coupling member that is inserted into the valve housing intersects with a virtual inner circumferential surface that is a virtual extension of an inner circumferential surface of the valve housing to the opening, and an inner surface of the opening has a region that does not contact the coupling member, a valve device characterized in that, in a flow path through which a fluid passes through the valve chest between the coupling member and the valve port, a passable area in a cross section including the central axes of both the valve housing and the coupling member, and a minimum passable area among cross sections perpendicular to the central axis of the valve housing and passing through the valve disc, are larger than an inner cross-sectional area of ​​the coupling member (excluding a valve device in which a member is provided to partition the valve chest into a space communicated with the coupling member and a space communicated with the valve port).

3. A valve device comprising: a cylindrical valve housing having an opening formed on a side surface; a valve element provided in a valve chamber inside the valve housing; a valve port to which the valve element approaches or moves away; a cylindrical coupling member connected to the valve housing by being inserted through the opening; a stepping motor; and a screw feed mechanism that converts rotational motion generated by the stepping motor to linearly move the valve element, an end surface of the coupling member that is inserted into the valve housing intersects with a virtual inner circumferential surface that is a virtual extension of an inner circumferential surface of the valve housing to the opening, and an inner surface of the opening has a region that does not contact the coupling member, In a flow path through which a fluid passes through the valve chamber between the coupling member and the valve port, a passable area in a cross section including central axes of both the valve housing and the coupling member, and a minimum passable area among cross sections that are perpendicular to the central axis of the valve housing and pass through the valve body, are larger than an inner cross-sectional area of ​​the coupling member, a guide member that guides the valve body on the valve port side of the screw feed mechanism, a valve device characterized in that, in a flow path through which a fluid passes through the valve chest between the coupling member and the valve port, the smallest passable area of ​​a cross section that is perpendicular to the central axis of the valve housing and passes through the valve disc or the guide member within a range that is an imaginary extension of the coupling member into the valve chest is larger than the internal cross-sectional area of ​​the coupling member (excluding a valve device in which a member that partitions the valve chest into a space that communicates with the coupling member and a space that communicates with the valve port is provided).

4. a recess formed around the valve port on a valve closing side surface of the valve housing; 4. The valve device according to claim 1, wherein the passable area in a cross section including the central axes of both the valve housing and the coupling member includes the area inside the recess.

5. 4. The valve device according to claim 1, wherein a peripheral edge of the valve port that is closest to the valve disc is located inside a cylindrical surface that is a virtual extension of an outer peripheral surface of the coupling member into the valve chamber.

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