Valve device

Abstract

This invention provides a valve device that can suppress the overall enlargement of the device and suppress noise. Because the connector component (10) does not protrude into the valve chamber (2A), when fluid flows from the connector component (10) into the valve chamber (2A), uneven flow of fluid within the valve chamber (2A) can be suppressed, thus suppressing velocity differences, pressure differences, and noise caused by vibration of the electric valve (1) and the sound of fluid passage. Since the area of ​​the passage portions (A1, A2) is larger than the inner cross-sectional area of ​​the connector component (10), the fluid flowing from the connector component (10) into the valve chamber (2A) is not throttled, thereby stabilizing the fluid flow and suppressing noise. Because the connector component (10) does not protrude into the valve chamber (2A), the passage cross-sectional area (A1, A2) can be easily increased, thus suppressing the overall enlargement of the device.

Description

Technical Field

[0001] This invention relates to a valve device. Background Technology

[0002] Conventionally, as a valve device, an electric valve has been proposed in which a porous body made of foamed metal is arranged along the inner wall of the valve body (for example, see Patent Document 1). In the electric valve described in Patent Document 1, abnormal noise is reduced by cutting the porous body at the portion corresponding to the opening where the conduit connector is installed.

[0003] Existing technical documents

[0004] Patent documents

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2018-087642 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, the electric valve described in Patent Document 1 requires space to accommodate the porous body, which leads to the disadvantage of making the overall electric valve too large. On the other hand, if only the valve body is miniaturized, the flow path becomes narrower regardless of the presence or absence of the porous body, and the fluid flow easily becomes uneven. This uneven flow of fluid passing through the valve port may thus become a source of noise. In other words, it is difficult to simultaneously achieve miniaturization of the overall device and noise suppression.

[0008] The purpose of this invention is to provide a valve device that can suppress the overall size of the device and reduce noise.

[0009] Methods for solving problems

[0010] The valve device of the present invention comprises: a cylindrical valve housing with an opening formed on its side; a valve core disposed in a valve chamber inside the valve housing; a valve port for the valve core to approach or separate; and a cylindrical connector member connected to the valve housing by being inserted through the opening. The valve device is characterized in that the end face of the connector member inserted into the valve housing is connected to or disposed outside an imaginary inner circumferential surface that imaginarily extends the inner circumferential surface of the valve housing to the opening. Between the connector member and the valve port, in the flow path of fluid through the valve chamber, the smallest passable area in the cross-section including the central axes of both the valve housing and the connector member, and the smallest passable area in the cross-section perpendicular to the central axis of the valve housing and passing through the valve core, is larger than the inner cross-sectional area of ​​the connector member.

[0011] According to the present invention as described above, the connector component is connected to the imaginary inner circumferential surface of the valve housing by its end face, or is positioned further outward than the imaginary inner circumferential surface, preventing the connector component from protruding into the valve housing. Therefore, when fluid flows from the connector component into the valve chamber, uneven flow of the fluid within the valve chamber can be suppressed, as can velocity and pressure differences. Consequently, noise caused by valve vibration and the sound of fluid passing through the valve port can be suppressed. Furthermore, because the minimum passable area in the cross-section including the central axes of both the valve housing and the connector component, and the minimum passable area in the cross-section perpendicular to the central axis of the valve housing and passing through the valve core, is larger than the inner cross-sectional area of ​​the connector component, the fluid flowing into the valve chamber from the connector component is not throttled, thus stabilizing the fluid flow and suppressing noise. Moreover, since the connector component does not protrude into the valve housing, it is easy to increase the aforementioned two passable cross-sectional areas, preventing the overall size of the device from becoming too large.

[0012] In this case, the valve device of the present invention preferably further includes a guide member for guiding the valve core. Between the connector member and the valve port, in the flow path of the fluid through the valve chamber, the smallest possible cross-sectional area of ​​the section that imaginarily extends the connector member into the valve chamber, perpendicular to the central axis of the valve housing and passing through the valve core or the guide member, is larger than the inner cross-sectional area of ​​the connector member. With this structure, it is easier to further suppress the throttling of fluid flowing from the connector member into the valve chamber.

[0013] In this case, in the valve device of the present invention, it is preferable that the inner circumferential surface of the valve housing and the imaginary inner circumferential surface extend along a cylindrical surface. With this structure, fluid flowing from the connector into the valve chamber can flow smoothly along the inner circumferential surface of the valve housing, further reducing noise. More preferably, no openings (e.g., openings for silencing components) are formed on the side of the valve housing, except for the opening for the connector.

[0014] Furthermore, in the valve device of the present invention, it is preferable that the inner diameter of the connector component is larger than the maximum outer diameter of the valve core. With this structure, the flow of fluid from the connector component into the valve chamber is less likely to be blocked by the valve core, thereby further reducing noise.

[0015] Furthermore, in the valve device of the present invention, it is preferable that the end face of the connector member, which is inserted into one side of the valve housing, extends along a plane perpendicular to the central axis of the connector member, and the entire end face is located inside the outer peripheral surface of the valve housing. With this structure, when assembling the connector member to the valve housing, it is not necessary to adjust the orientation of the connector member (rotation angle centered on the axial direction), thus improving assemblability. That is, in a structure where the end face of the connector member has a shape around the opening and the connector member does not protrude into the valve housing, it is necessary to adjust the orientation of the connector member; in contrast, when the end face is along a plane perpendicular to the central axis, such adjustment is not required.

[0016] Furthermore, in the valve device of the present invention, it is preferable that the opening includes: an insertable portion into which the connector member can be inserted; and a limiting portion that protrudes towards the inner diameter side at a position further inward than the insertable portion, thereby limiting the insertion of the connector member. With this structure, over-insertion of the connector member can be limited, ensuring that the insertion depth is a predetermined depth. Thus, it is easy to prevent the connector member from protruding into the valve housing.

[0017] Furthermore, in the valve device of the present invention, it is preferable that the minimum inner diameter of the limiting portion is greater than or equal to the inner diameter of the connector member. Moreover, in the valve device of the present invention, it is more preferable that the protrusion dimension of the limiting portion from the insertable portion toward the inner diameter side is less than 50% of the wall thickness of the connector member. With this structure, when fluid flows from the connector member into the valve chamber, the flow is less likely to be blocked by the limiting portion, further reducing noise.

[0018] The effects of the invention

[0019] The valve device according to the present invention can suppress the overall size of the valve device and suppress noise. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view showing a valve device as an example embodiment of the present invention.

[0021] Figure 2 This is a cross-sectional view showing the connection between the valve body and the connector component in the valve device.

[0022] Figure 3 This is a cross-sectional view showing the passage of fluid in the valve device.

[0023] Figure 4 This is a cross-sectional view showing the passage of fluid in the valve device.

[0024] Figure 5 This is a cross-sectional view showing the connection between the valve body and the connector component in the valve device of the first modified example.

[0025] Figure 6 This is a cross-sectional view showing the fluid passage portion in the valve device of the second modified example.

[0026] Figure 7 This is a cross-sectional view showing the fluid passage in the valve device of the third modified example.

[0027] Figure 8 This is a cross-sectional view showing the fluid passage in the valve device of the third modified example.

[0028] In the figure: 1…valve device, 2…valve housing, 21, 26…opening, 24…valve port, 261…insertable part, 262…restricting part, 2A…valve chamber, 3…valve core body, 5…support component (guide component), 10…connector component, 101…end face, 20…valve core, S1…inner circumferential surface, S2…imaginary inner circumferential surface. Detailed Implementation

[0029] The embodiments of the present invention will be described with reference to the accompanying drawings. The electric valve 1 of this embodiment is a valve device used in the refrigeration cycle system of an air conditioner such as a combined air conditioner or an indoor air conditioner, and includes a valve housing 2, a valve core body 3, a valve bracket 4, a support component 5, and a stepper motor 6.

[0030] The valve housing 2 is formed as a cylinder with an opening at the top, and the valve core body 3 and valve support 4 are housed in the valve chamber 2A inside it. The valve housing 2 has a cylindrical side portion 27 and a section disposed at one end of the side portion 27. Figure 1 The bottom part 28 of the lower end. The cylindrical side part 27 has an outer side 271 and an inner side 272, and the inner side 272 has an inner circumferential surface S1. The inner side 272 has a shape that expands in diameter on the upper side, but the inner circumferential surface S1 refers to the part without expansion, specifically the area around the region where the opening 21 is formed. In addition, the inner circumferential surface S1 does not include the opening 21 itself. Hereinafter, the axial direction of the valve body 2 is defined as the Z direction, and the two directions orthogonal to the Z direction are defined as the X direction and the Y direction, respectively. In addition, hereafter, the upper and lower parts in the Z direction are defined as... Figure 1 Based on this, the upper side is designated as the open valve side, and the lower side as the closed valve side. An opening 21 is formed on the side portion 27 of the valve housing 2 for inserting a connector member 10 that communicates with the valve chamber 2A. A cylindrical opening 22 is formed at the lower end (bottom portion 28). The end of a connector member 11 extending in the Z direction is inserted through and connected to the cylindrical opening 22, and a valve seat portion 23 is integrally formed thereon. The connector member 11 communicates with the valve port 24 of the valve seat portion 23. No openings other than the opening 21 are formed on the side portion 27.

[0031] The valve core body 3 is disposed at the lower end of the valve bracket 4, that is, it is fitted into the valve bracket 4 and fixed by welding, and is suspended from the valve bracket 4. The valve core body 3 extends downward from the valve bracket 4 and has a needle valve 31 at its front end. The needle valve 31 is close to or separate from the periphery 25 of the valve port 24 (described later) of the valve seat portion 24. In this embodiment, the needle valve 31 can abut against the periphery 25, and the part of the periphery 25 where the needle valve 31 abuts becomes a sealing part.

[0032] The valve support 4 is formed as a cylinder extending in the Z direction, and its upper end engages with the lower end of the rotor shaft 61 of the stepper motor 6 (described later). That is, the valve support 4 is suspended by the rotor shaft 61 and can rotate relative to the rotor shaft 61. A compression coil spring 41 is provided inside the valve support 4 to apply a downward load to the valve core body 3. The valve core 20 is constituted by the valve core body 3 and the valve support 4 as described above. That is, the "valve core" includes a valve core body that is nearly separated from the periphery of the valve port, and includes components that move integrally with the valve core, and may also include components other than the valve support. In addition, the "valve core" only needs to include at least the valve core body, and may not have a valve support, compression coil spring, etc.

[0033] The support member 5 is fixed to the valve housing 2 at the flange portion 51 in a manner that seals the upper opening of the valve housing 2. The support member 5 has: a guide recess 52 that receives the valve support 4 and guides it in the Z direction; an internal thread portion 53 that engages with the rotor shaft 61; and a connecting hole 54 that connects the guide recess 52 to the space within the housing 62 of the stepper motor 6 (described later). The support member 5 functions as a guide member by having the guide recess 52 that guides the valve support 4 in the valve core 20.

[0034] The stepper motor 6 comprises a rotor shaft 61, a housing 62, a magnetic rotor 63, and a stator coil 64. Inside the housing 62, a magnetic rotor 63, whose outer periphery is magnetized into multiple poles, is rotatably disposed, and the rotor shaft 61 is fixed to the magnetic rotor 63. The housing 62 is fixed to the valve housing 2 by blocking the upper opening of the valve housing 2. The stator coil 64 is disposed on the outer periphery of the housing 62. The stepper motor 6 rotates the magnetic rotor 63 according to the number of pulse signals provided to the stator coil 64.

[0035] An external threaded portion 611 is formed on the outer circumferential surface of the rotor shaft 61, which engages with the internal threaded portion 53 of the support member 5. Driven by the stepper motor 6, the magnetic rotor 63 and the rotor shaft 61 rotate, and the rotor shaft 61 moves in the Z direction via a threaded feed mechanism composed of the external threaded portion 611 and the internal threaded portion 53. As a result, the valve bracket 4 suspended on the rotor shaft 61 moves in the Z direction while being guided by the guide recess 52 of the support member 5, and the needle valve 31 of the valve core body 3 abuts against or separates from the periphery 25 of the valve port 24 (seating or dismounting), thus opening and closing the valve port 24. Alternatively, it can be configured such that when the needle valve 31 is closest to the periphery 25 of the valve port 24, the needle valve 31 does not abut against the periphery of the valve port 24. Furthermore, the opening degree of the valve port 24 is controlled according to the Z-direction position (lifting amount) of the valve core body 3, thereby controlling the flow rate of the fluid flowing through the valve port 24.

[0036] Here, refer to Figure 2 The detailed relationship between the opening 21 formed on the side of the valve housing 2 and the connector 10 inserted into the opening 21 will be explained. Figure 1 This represents the cross-section containing the central axes L1 and L2 of both the valve housing 2 and the connector component 10. Figure 2 This represents a section perpendicular to the central axis L1 of the valve housing 2 (along...). Figure 1 (The cross section of the Z2-Z2 line). The connector component 10 is formed as a cylinder extending in the X direction (i.e., the central axis L2 is along the X direction), and the opening 21 is formed as a circle when viewed from the X direction, corresponding to the outer peripheral surface of the connector component 10. The outer diameter of the connector component 10 is the same as or slightly smaller than the inner diameter of the opening 21.

[0037] The end face 101 of the connector component 10, which passes through one side of the valve housing 2, connects to an imaginary inner circumferential surface S2 that imaginarily extends the inner circumferential surface S1 of the valve housing 2 to the opening 21, or is positioned outside the imaginary inner circumferential surface S2. That is, as Figure 2 As shown, the imaginary inner circumferential surface S2 is arc-shaped in the cross-section along the XY plane, and its central portion is connected to the end face 101, or the end face 101 is located further outward than the central portion. Figure 1 , Figure 2 (Right side of the valve housing 2). Therefore, the connector component 10 does not protrude into the valve chamber 2A within the valve housing 2. Furthermore, the end face 101 is entirely located inside the outer peripheral surface of the valve housing 2. That is, the outer peripheral edge of the end face 101 is disposed within the opening 21. Additionally, in the cross-sectional view... Figure 2 In the diagram, the imaginary inner circumferential surface S2 is represented by a dashed line, but on this inner side, there is an inner edge 211 in the X direction of the opening 21.

[0038] Furthermore, the end face 101 of the connector component 10 extends along the YZ plane and has a shape that is rotationally symmetric about the central axis L2 (i.e., it overlaps with the original shape when the connector component 10 is rotated at any angle about the central axis L2). In contrast, the opening 21 is formed on the side of the cylindrical valve housing 2, so the imaginary inner circumferential surface S2 has a three-dimensional shape of a cylindrical curved surface extending in the same Z direction (axis L1 direction) as the inner circumferential surface S1.

[0039] Next, the area of ​​the flow path when fluid flows from the connector component 10 into the valve chamber 2A will be described. In the flow path of fluid through the valve chamber 2A between the connector component 10 and the valve port 24, the passage portion A1 in the cross-section including the central axes L1 and L2 of both the valve housing 2 and the connector component 10 is shown in shaded form. Figure 3 In this embodiment, the upper end of the passage portion A1 is, for example, an extension line imaginarily extending along the X direction from the upper end of the outer peripheral surface of the connector member 10. When fluid flows from the connector member 10 into the valve chamber 2A, the fluid is allowed to flow in a region imaginarily extending into the valve chamber 2A from the inner peripheral surface of the connector member 10. At this time, a portion of the fluid actually flows outside this extended region; therefore, in this embodiment, the passage portion A1 is defined using an extension line extending the outer peripheral surface of the connector member 10, including the thickness of the connector member 10. Depending on the fluid velocity or flow rate, and the thickness of the connector member, either an extension line extending the central portion in the thickness direction of the connector member or an extension line extending the inner peripheral surface can be used.

[0040] The upper surface of the bottom part 28 of the valve housing 2 has: an annular surface 281 extending along the XY plane; and a frustum conical surface 282 continuous with the inner side of the annular surface 281 and extending upward toward the periphery 25 of the valve port 24, having a centrally raised shape. That is, a recess is formed around the periphery 25 of the valve port 24, and the annular surface 281, which serves as the bottom surface of this recess, is located lower than the lower end of the connector member 10. The passage portion A1 also includes this recess. Furthermore, the passage portion A1 is the inner side of the valve housing 2, and refers to the space outside the valve core body 3, valve bracket 4, and support member 5. The passable area of ​​the passage portion A1 is larger than the inner cross-sectional area of ​​the connector member 10.

[0041] In the flow path of fluid through valve chamber 2A between connector 10 and valve port 24, the section with the smallest fluid passage area (the section along line Z2-Z2) perpendicular to the central axis L1 of valve housing 2 and passing through valve core 20, and this passage portion A2 are shown in shaded areas. Figure 4 In this embodiment, Figure 4This refers to the cross-section of the valve support 4. In this embodiment, the maximum outer diameter of the valve support 4 is equal to the inner diameter of the guide recess 52. Furthermore, the passage portion A2 is the inner side of the valve housing 2, and refers to the space outside the valve support 4. The passable area of ​​the passage portion A2 is larger than the inner cross-sectional area of ​​the connector member 10. In addition, the inner diameter of the connector member 10 is larger than the maximum outer diameter of the valve core 20 (i.e., the outer diameter of the valve support 4).

[0042] According to the above-described embodiment, since the connector component 10 does not protrude into the valve chamber 2A, when fluid flows from the connector component 10 into the valve chamber 2A, uneven flow of fluid within the valve chamber 2A can be suppressed, and velocity and pressure differences can be suppressed. Therefore, noise caused by vibration of the electric valve 1 and the sound of fluid passage can be suppressed. In addition, by making the areas of the passage portions A1 and A2 larger than the inner cross-sectional area of ​​the connector component 10, the fluid flowing from the connector component 10 into the valve chamber 2A is not throttled, the fluid flow can be stabilized, and noise can be suppressed. Moreover, since the connector component 10 does not protrude into the valve chamber 2A, it is easy to increase the passage cross-sectional areas A1 and A2, and the overall enlargement of the device can be prevented.

[0043] Furthermore, since the inner circumferential surface of the valve housing 2 and the imaginary inner circumferential surface S2 extend along the cylindrical surface, the fluid flowing into the valve chamber 2A from the connector component 10 can flow smoothly along the inner circumferential surface of the valve housing 2, which can further reduce noise. Moreover, since no opening other than the opening 21 is formed in the side portion 27, the fluid can flow more smoothly along the inner circumferential surface of the valve housing 2.

[0044] In addition, by making the inner diameter of the connector component 10 larger than the maximum outer diameter of the valve core 20, the flow of fluid flowing from the connector component 10 into the valve chamber 2A is less likely to be blocked by the valve core body 3, which can further reduce noise.

[0045] Furthermore, since the end face 101 of the connector component 10 extends along the YZ plane, when assembling the connector component 10 relative to the valve housing 2, it is not necessary to adjust the orientation of the connector component 10 (rotation angle centered on the X direction), which can improve the assemblability.

[0046] Furthermore, the present invention is not limited to the above-described embodiments, and includes other structures that can achieve the purpose of the present invention, as well as the variations shown below. In the various variations described below, the same reference numerals are used to refer to the same structures as in the above embodiments, and the descriptions are omitted. In the above embodiments, the inner diameter of the opening 21 is constant, and only the connector component 10 is inserted through it, but as a first variation, such as Figure 5As shown, it can also be configured such that the opening 26 has an insertable portion 261 into which the connector member 10 can be inserted, and a limiting portion 262 that restricts the insertion of the connector member 10 by protruding into the inner diameter side of the opening 26 from the inside of the insertable portion 261 in the insertion direction.

[0047] In the first modification, the inner diameter of the insertable portion 261 is equal to or slightly larger than the outer diameter of the connector member 10, and the minimum inner diameter of the limiting portion 262 is smaller than the outer diameter of the connector member 10. By forming steps with such insertable portion 261 and limiting portion 262, over-insertion of the connector member 10 can be limited, ensuring the insertion depth is a predetermined depth, and easily preventing the connector member 10 from protruding into the valve chamber 2A. Furthermore, the limiting portion 262 can be circular when viewed from the X direction, or it can protrude locally towards the inner circumference in the circumferential direction.

[0048] In the first modified example, the minimum inner diameter of the limiting part 262 is greater than or equal to the inner diameter of the connector member 10. Furthermore, the protrusion L3 of the limiting part 262 extending from the insertable part 261 towards the inner diameter side of the opening 26 is less than 50% of the wall thickness of the connector member 10. Therefore, when fluid flows from the connector member 10 into the valve chamber 2A, the flow is less likely to be blocked by the limiting part 262, further reducing noise.

[0049] Furthermore, in the first variation, the minimum inner diameter of the limiting portion 262 is greater than or equal to the inner diameter of the connector member 10, and the protrusion dimension of the limiting portion 262 extending from the insertable portion 261 toward the inner diameter side is less than 50% of the wall thickness of the connector member 10. However, the relationship between these dimensions is not limited to this. For example, when the wall thickness of the connector member is small, the aforementioned protrusion dimension may be greater than 50% of the wall thickness, or the minimum inner diameter of the limiting portion may be less than or equal to the inner diameter of the connector member. By increasing the protrusion dimension of the limiting portion, the connector member can be easily locked by the limiting portion, and over-insertion can be easily restricted.

[0050] Furthermore, in the above embodiment, the area of ​​the passage portion A2, which is perpendicular to the central axis L1 of the valve housing 2 and has the smallest fluid passage area in the cross-section of the valve core 20, is larger than the inner cross-sectional area of ​​the connector member 10. However, as such a passage portion, a passage portion with the smallest fluid passage area in the cross-section other than the valve core can also be used. For example, such as Figure 1 As shown, in the flow path of fluid through valve chamber 2A between connector 10 and valve port 24, a support member 5 may be included within a range that imaginarily extends connector 10 (including its outer circumferential surface, inner circumferential surface, and the central portion in the thickness direction of connector 10) into valve chamber 2A. When the support member 5 is larger than the outer diameter of valve core 20, the passage portion is defined based on the cross-section through the support member 5. That is, as a second variation, such as... Figure 6 As shown, it can also be configured to, along Figure 1The area of ​​the through portion (the space outside the support member 5 and inside the valve body) A5 in the cross section of line Z1-Z1 is greater than the inner cross-sectional area of ​​the connector member 10.

[0051] In addition, in the above embodiment, the inner diameter of the connector component 10 is larger than the maximum outer diameter of the valve core 20. However, the dimensions of the connector component and the valve core can be appropriately set according to the purpose of the valve device, the intended flow rate, etc., and the inner diameter of the connector component can also be less than the maximum outer diameter of the valve core.

[0052] Furthermore, in the above embodiment, the end face 101 of the connector member 10 extends along the YZ plane, but this end face may also extend along a curved surface. For example, the end face of the connector member may also have a three-dimensional shape along the inner periphery of the opening 21 (the shape along the imaginary inner periphery surface S2). With such a structure, the area between the outer periphery surface of the connector member and the inner periphery surface of the opening 21 can be increased, thereby stabilizing the connection structure. In addition, for example, if markings are added to the outer periphery surface of the connector member, the operator can determine the orientation of the connector member, thus ensuring assemblability. Furthermore, in the above embodiment, the entire end face 101 of the connector member 10 is located inside the outer periphery surface of the valve housing 2, but a portion of the end face of the connector member may be located outside the outer periphery surface of the valve housing.

[0053] Furthermore, in the above embodiment, the end face 101 of the connector member 10 is located further outward than the imaginary inner circumferential surface S2, and the connector member 10 does not protrude into the valve chamber 2A. However, as a third variation, it can also be configured as follows: Figure 7 , 8 As shown, the end face 101 of the connector component 10 intersects with the imaginary inner circumferential surface S2, and the connector component 10 protrudes slightly into the valve chamber 2A. At this time, Figure 7 The passage section A3 shown and Figure 8 The passage portion A4 shown is an area that is more inward than the plane S3 along the end face 101. In this second variation, both passage portions A3 and A4 are larger than the inner cross-sectional area of ​​the connector member 10, which can suppress noise. In addition, if the protrusion of the end face 101 of the connector member 10 intersects with the imaginary inner peripheral surface S2 is large enough, it is easy to increase the area of ​​the passage portions A3 and A4, which can prevent the overall size of the device from becoming too large.

[0054] Furthermore, in the above embodiment, an electric valve 1 was exemplified as a valve device. However, any device that has a connector component inserted through an opening on the side of a cylindrical valve housing is acceptable, and the driving method and other structures are not particularly limited. For example, the valve device may also be an electromagnetic valve that includes an attractor, a plunger, and an electromagnetic coil, and drives the plunger by energizing / de-energizing the electromagnetic coil, causing the valve core disposed on the plunger to approach or move away from the valve port.

[0055] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments, and design changes that do not depart from the spirit of the present invention are also included in the present invention.

Claims

1. A valve device comprising: a cylindrical valve housing with an opening formed on its side; a valve core disposed in a valve chamber inside the valve housing; a valve port for the valve core to approach or separate; a cylindrical connector member connected to the valve housing by inserting into the opening; a stepper motor; and a threaded feed mechanism for converting the rotational motion generated by the stepper motor to cause linear motion of the valve core. The valve device is characterized in that... The stepper motor includes: a housing fixed to the valve housing; a magnetic rotor disposed within the housing; and stator coils disposed on the outer periphery of the housing. The end face of the connector component that is inserted into one side of the valve housing is either connected to or disposed on an imaginary inner circumferential surface that imaginarily extends the inner circumferential surface of the valve housing to the opening. The end face of the connector component extends along a plane perpendicular to the central axis of the connector component, and the entire end face is located inside the outer peripheral surface of the valve housing. The inner surface of the opening has a region that does not contact the connector component on the valve chamber side, further from the end face. Between the connector component and the valve port, in the flow path of fluid through the valve chamber, the passable area in the cross section including the central axes of both the valve housing and the connector component, and the smallest passable area in the cross section perpendicular to the central axis of the valve housing and passing through the valve core, is larger than the inner cross-sectional area of ​​the connector component.

2. A valve device comprising: a cylindrical valve housing with an opening formed on its side; a valve core disposed in a valve chamber inside the valve housing; a valve port for the valve core to approach or separate; a cylindrical connector member connected to the valve housing by inserting into the opening; a stepper motor; and a threaded feed mechanism for converting the rotational motion generated by the stepper motor to cause linear motion of the valve core. The valve device is characterized in that... The stepping motor has: a magnetic rotor; a stator coil; and the rotor shaft fixed to the magnetic rotor, The valve core has: a valve support that can rotate relative to the rotor shaft; A valve core body that is nearly separated from the valve port; and a compression helical spring disposed within the valve support and applying force to the valve core body toward the valve port side. The end face of the connector component that is inserted into one side of the valve housing is either connected to or disposed on an imaginary inner circumferential surface that imaginarily extends the inner circumferential surface of the valve housing to the opening. The end face of the connector component extends along a plane perpendicular to the central axis of the connector component, and the entire end face is located inside the outer peripheral surface of the valve housing. The inner surface of the opening has a region that does not contact the connector component on the valve chamber side, further from the end face. Between the connector component and the valve port, in the flow path of fluid through the valve chamber, the passable area in the cross section including the central axes of both the valve housing and the connector component, and the smallest passable area in the cross section perpendicular to the central axis of the valve housing and passing through the valve core, is larger than the inner cross-sectional area of ​​the connector component.

3. The valve device according to claim 1, characterized in that, It also includes a guide component for guiding the valve core. Between the connector component and the valve port, in the flow path of the fluid through the valve chamber, the smallest passable area in the section of the connector component that is imaginarily extended into the valve chamber, perpendicular to the central axis of the valve housing and passing through the valve core or the guide component, is larger than the inner cross-sectional area of ​​the connector component.

4. A valve device comprising: a cylindrical valve housing with an opening formed on its side; a valve core disposed in a valve chamber inside the valve housing; a valve port for the valve core to approach or separate; a cylindrical connector member connected to the valve housing by inserting into the opening; a stepper motor; and a threaded feed mechanism for converting the rotational motion generated by the stepper motor to cause linear motion of the valve core. The valve device is characterized in that... The end face of the connector component that is inserted into one side of the valve housing is either connected to or disposed on an imaginary inner circumferential surface that imaginarily extends the inner circumferential surface of the valve housing to the opening. The end face of the connector component extends along a plane perpendicular to the central axis of the connector component, and the entire end face is located inside the outer peripheral surface of the valve housing. The inner surface of the opening has a region that does not contact the connector component on the valve chamber side, further from the end face. Between the connector component and the valve port, in the flow path of the fluid through the valve chamber, the passable area in the cross-section including the central axes of both the valve housing and the connector component, and the smallest passable area in the cross-section perpendicular to the central axis of the valve housing and passing through the valve core, is larger than the inner cross-sectional area of ​​the connector component. It also includes a guide component that guides the valve core further from the valve port than the threaded feed mechanism. Between the connector component and the valve port, in the flow path of the fluid through the valve chamber, the smallest passable area in the section of the connector component that is imaginarily extended into the valve chamber, perpendicular to the central axis of the valve housing and passing through the valve core or the guide component, is larger than the inner cross-sectional area of ​​the connector component.

5. The valve device according to any one of claims 1 to 3, characterized in that, The inner circumferential surface of the valve housing and the imaginary inner circumferential surface extend along a cylindrical surface.

6. The valve device according to any one of claims 1 to 4, characterized in that, The inner diameter of the connector component is larger than the maximum outer diameter of the valve core.

7. The valve device according to any one of claims 1 to 4, characterized in that, The opening has an insertable portion into which the connector component can be inserted, and a limiting portion that restricts the insertion of the connector component by protruding towards the inner diameter side at a position further inward than the insertable portion.

8. The valve device according to claim 7, characterized in that, The minimum inner diameter of the limiting part is above the inner diameter of the joint component.

9. The valve device according to claim 8, characterized in that, The protrusion of the limiting portion from the insertable portion toward the inner diameter side is less than 50% of the wall thickness of the connector component.

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