Valve device
By using bonding materials such as brazing materials in the valve body of the valve device to connect the joints and seal the ends of the axial communication path, the fluid leakage problem caused by bubbles in the prior art is solved, and an effective fluid sealing effect is achieved.
Patent Information
- Application Number
- CN202210348189.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Priority Date
- 2021-04-14
- Filing Date
- 2022-04-01
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2042-04-01
AI Technical Summary
When the valve body is formed, the existing valve device has tiny bubbles in the raw material metal block, resulting in continuous communication paths in the axial direction, which may lead to fluid leakage to the outside.
The first joint and the second joint are joined to the valve body by using a bonding method such as brazing, welding or welding in the first joint and the second joint of the valve body. This structure ensures that the outermost exposed portion overlaps with the outermost edge of the radially outermost side of the second engaging portion when viewed in the axial direction, or is located in the inner side more radially than the outermost side of the engaging portion, thereby blocking the axial end of the communication path.
It effectively suppresses fluid leakage (external leakage) and ensures that the internal space of the valve body does not communicate with the external space.
Smart Images
Figure CN115199769B_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a valve device. Background Art
[0002] Currently, a valve device is widely used, which includes a valve body (valve housing) having a valve port, a valve element that changes the opening degree of the valve port, and a drive unit that drives the valve element to move forward and backward. In such a valve device, as the valve body, a valve body formed by cutting a metal material such as stainless steel or brass is known (for example, refer to Patent Document 1). As a forming step of such a valve body, a metal block is axially stretched by extrusion, drawing, etc. to form a metal rod, and then the metal rod is cut and machined to form a valve chamber space, a valve seat portion, or a connection portion for connecting a joint inside.
[0003] Prior Art Documents
[0004] Patent Documents
[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2019-044880 Summary of the Invention
[0006] Problems to be Solved by the Invention
[0007] Here, in the existing valve device described in Patent Document 1, when forming the valve body, the metal block used as a raw material sometimes contains minute air bubbles. If such a metal block is stretched to form a metal rod, the air bubbles are also stretched, and a continuous communication path in the axial direction may be formed. Moreover, in the valve device, if the internal space of the valve body communicates with the external space through such a communication path, there is a possibility of fluid leakage to the outside.
[0008] An object of the present invention is to provide a valve device capable of suppressing fluid leakage (external leakage).
[0009] Means for Solving the Problems
[0010] The valve device of the present invention includes a valve body that constitutes a valve chamber and a valve port, and a valve element that changes the opening degree of the valve port. A first joint is connected to the valve body in the radial direction, and a second joint is connected to the valve body in the axial direction. The valve device is characterized in that the valve body is formed in a cylindrical shape that extends along the axial direction as a whole, has an internal space that constitutes the valve chamber, and a valve port and a second joint portion for joining the second joint are provided on one end side of the valve body in the axial direction. A first joint portion for joining the first joint is provided on the side surface of the valve body in the radial direction. Among the internal exposed portions exposed in the internal space of the valve body, the outermost exposed portion located on the outermost side in the radial direction overlaps with the outermost edge of the joint portion on the outermost side in the radial direction of the second joint portion when viewed along the axial direction, or is located on the inner side in the radial direction of the outermost edge of the joint portion.
[0011] First, in the first joint portion and the second joint portion, the first joint and the second joint are joined to the valve body by a joining material such as a melt in a joining method such as solder, welding, or cladding in brazing. According to the present invention described above, even if the above-mentioned axial communication path exists inside the outermost exposed portion in the radial direction, since the outermost exposed portion overlaps with the outermost edge of the joint portion on the outermost side in the radial direction of the second joint portion when viewed along the axial direction, or is located on the inner side in the radial direction of the outermost edge of the joint portion, the axial end of the communication path is blocked by the joining material or the second joint, or is located in the flow path inside the second joint. As a result, the internal space of the valve body and the external space are not connected, and leakage of fluid (external leakage) can be suppressed.
[0012] At this time, preferably, the outer edge of the second joint portion is constituted by a joint recess formed in an annular shape centered on the axis and formed in a groove shape, and a solder as a joining material is filled in the joint recess. According to this structure, the joint recess becomes a solder accumulation portion, and the axial end of the above-mentioned communication path is effectively blocked by the solder filled therein, so that leakage of fluid (external leakage) can be effectively suppressed.
[0013] In addition, preferably, a chamfered portion is formed in the joint recess, and the outermost edge of the joint portion is constituted by the outer edge of the chamfered portion. According to this structure, for example, the solder can be extended to the outer edge of the chamfered portion by wettability or the like. As a result, in the second joint portion, the range capable of blocking the axial end of the communication path can be expanded to the outer side in the radial direction, so that leakage of fluid (external leakage) can be further effectively suppressed.
[0014] Further, preferably, the valve body has a lid engaging portion for engaging a lid member on the other end side in the axial direction, and the outermost exposed portion of the valve body is defined by any one of a first internally exposed portion, a second internally exposed portion, and a third internally exposed portion. Among them, the first internally exposed portion is located on the innermost wall surface of the valve chamber and is the outermost in the radial direction, the second internally exposed portion is located on the portion along the inner peripheral edge of the first joint of the first joint portion and is the outermost in the radial direction, and the third internally exposed portion is located on the outer peripheral edge of the lid engaging portion facing the inner peripheral edge of the lid member. According to this structure, the outermost exposed portion of the valve body is defined by any one of the shapes that can be conceived as the structure of the valve device, such as the inner wall shape of the valve chamber, the joint shape between the first joint connected in the radial direction, and the joint shape between the lid member. Moreover, the outermost exposed portion under such a concept is configured to overlap with the outermost edge of the joint portion on the outermost side in the radial direction of the second joint portion when viewed in the axial direction, or to be located on the inner side in the radial direction than the outermost edge of the joint portion. Therefore, it is possible to further effectively suppress the leakage of fluid (external leakage).
[0015] Further, preferably, the lid engaging portion has an annular protrusion protruding in a circular shape centered on the axis, and the lid member is fitted and joined to the annular protrusion. According to this structure, by fitting with the annular protrusion, the lid member is joined to the valve body in a well-balanced manner centered on the axis, so that the axial operation of the valve element inside the valve body can be made stable.
[0016] Further, preferably, the inner diameter of the valve chamber is formed to be larger than the inner diameter of the first joint. According to this structure, it is possible to suppress the pressure loss in the valve chamber and allow the fluid to flow.
[0017] The effects of the invention are as follows.
[0018] According to the valve device of the present invention, it is possible to suppress the leakage of fluid (external leakage). BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 are a longitudinal sectional view and an axial sectional view along line V11-V11 of a valve device according to an embodiment of the present invention.
[0020] Figure 2 is a Figure 1 magnified view of the internal space constituting the valve chamber and the second joint portion for joining the second joint shown.
[0021] Figure 3 is a Figure 2 magnified view of the first region A11, the second region A12, and the third region A13 in
[0022] Figure 4 is aFigures 1 to 3 Longitudinal sectional view of the valve device of the first comparative example of the illustrated valve device and axial sectional view along line V21-V21.
[0023] Figure 5 is Figures 1 to 3 Longitudinal sectional view of the valve device of the second comparative example of the illustrated valve device and axial sectional view along line V31-V31.
[0024] Figure 6 is Figures 1 to 3 Longitudinal sectional view of the valve device of the modified example of the illustrated valve device 10 and axial sectional view along line V41-V41.
[0025] In the figure:
[0026] 10, 40—valve device, 11, 41—valve body, 11a—solder, 12, 22—valve element, 18—cover member, 111, 411—valve chamber, 111a, 211a, 411a—first internal exposed portion, 113a, 313a, 413a—second internal exposed portion, 115—cover joint portion, 115a—outer peripheral edge, 115b—third internal exposed portion, 116, 416—internal space, 116a, 416a—internal exposed portion, 116b, 416b—outermost exposed portion, 113, 413—first joint portion, 114, 214—second joint portion, 131, 431—first joint, 132, 232—second joint, D11, D21—radial direction, D12, D22—axial direction. Detailed Description of the Invention
[0027] Hereinafter, based on Figures 1 to 4 a valve device according to an embodiment of the present invention will be described.
[0028] Figure 1 is a longitudinal sectional view of a valve device according to an embodiment of the present invention and an axial sectional view along line V11-V11.
[0029] Next, based on Figure 1 a valve device 10 according to an embodiment will be described. The valve device 10 is an electric valve including a valve body 11 that forms a valve chamber 111 and a valve port 112 and a valve element 12 that changes the opening degree of the valve port 112. In the valve device 10, a first joint 131 is connected to the valve body 11 in the radial direction D11, and a second joint 132 is connected in the axial direction D12 along the axis L11.
[0030] The valve body 11 is a component formed by machining a metal rod formed by stretching a metal block such as stainless steel or brass. It is formed in a cylindrical shape centered on the axis L11 and extending along the axial direction D12 as a whole, and has an internal space constituting the valve chamber 111. On one end side of the valve body 11 in the axial direction D12, there are provided a cylindrical valve port 112 opening into the valve chamber 111 and a second joint portion 114 for joining the circular tubular second joint 132. Also, on the side surface of the valve body 11 in the radial direction D11, there is provided a first joint portion 113 for joining the circular tubular first joint 131. In the present embodiment, the inner diameter of the cylindrical valve chamber 111 is formed to be larger than the inner diameter of the circular tubular first joint 131. The fluid flows between the first joint 131 and the second joint 132 via the valve chamber 111 and the valve port 112, and its flow rate is adjusted by the valve element 12 that changes the opening degree of the valve port 112.
[0031] The valve element 12 is a round bar component with a tapered front end portion, and is configured to enter the interior of the valve chamber 111 from the end portion on the side opposite to the valve port 112 in the axial direction D12. Moreover, the opening degree of the valve port 112 is changed by moving the valve element 12 along the axial direction D12 in such a way that the front end portion approaches or moves away from the valve port 112.
[0032] In the valve body 11, a valve guide member 141 is installed by press-fitting and riveting so as to be inserted into the valve chamber 111 from the end portion on the side opposite to the valve port 112. The valve element 12 passes through the guide hole at the center of the valve guide member 141 and enters the valve chamber 111 in such a way that the front end portion can move along the axial direction D12. Then, the end portion of the valve element 12 on the side opposite to the valve port 112 is connected via a valve holder 142 to the rotor shaft 162 of a stepping motor 16 for driving the valve element.
[0033] Also, on the other end side of the valve body 11 in the axial direction D12 on the side opposite to the valve port 112, a cover joint portion 115 for joining the lower end opening of a longitudinally long cap-shaped cover member 18 is provided so as to surround the outer peripheral side of the valve guide member 141. The cover member 18 includes a cylindrical housing 181 on the lower end opening side and a housing portion 182 that covers the upper portion of the housing 181 and is hermetically fixed by welding or the like, and houses the rotor shaft 162 and the magnetic rotor 161 of the stepping motor 16.
[0034] On the inner edge of the opening on the side of the housing portion 182 of the housing 181, a support member 143 is installed to support the valve holder 142 so as to be movable along the axial direction D12. The support member 143 is installed on the inner edge of the opening of the housing 181 at the middle portion in the axial direction D12. On one side of the valve body 11, a guiding space for receiving the valve holder 142 and guiding it along the axial direction D12 is formed. On the opposite side thereof, an internal thread portion for threadedly engaging with the external thread portion of the rotor shaft 162 of the stepping motor 16 is formed. The rotor shaft 162 enters the guiding space of the valve holder 142 in the support member 143 in a state where the external thread portion is threadedly engaged with the internal thread portion, and its front end is connected to the end of the valve element 12 via the valve holder 142.
[0035] In addition to the rotor shaft 162, the stepping motor 16 includes a magnetic rotor 161 fixed to the rotor shaft 162 and a stator coil 163 disposed outside the housing portion 182 corresponding to the magnetic rotor 161. By applying a pulse signal to the stator coil 163, the magnetic rotor 161 rotates corresponding to the number of pulses and the rotor shaft 162 rotates. In this way, by means of the thread feed mechanism composed of the external thread portion of the rotor shaft 162 and the internal thread portion of the support member 143, the rotor shaft 162 moves forward and backward along the axial direction D12, and the valve element 12 connected by the valve holder 142 moves forward and backward together with the rotor shaft 162. As a result, the distance between the front end of the valve element 12 and the valve port 112 changes and the opening degree of the valve port 112 is changed.
[0036] And, the end of the rotor shaft 162 on the side opposite to the valve element 12 is inserted into the inside of a cylindrical rotor guide 171 hanging down from the end surface in the axial direction D12 of the inner surface of the housing portion 182 and is supported. In addition, a rotation limit mechanism 172 for the magnetic rotor 161 is provided on the outer periphery of the rotor guide 171. The rotation limit mechanism 172 defines the upper and lower limits of the movement of the rotor shaft 162, that is, the valve element 12, along the axial direction D12.
[0037] With the above structure, when the stepping motor 16 is driven, the magnetic rotor 161 and the rotor shaft 162 rotate, and by the above-mentioned thread feed mechanism, the rotor shaft 162 moves forward and backward along the axial direction D12. With the forward and backward movement of the rotor shaft 162 generated by this rotation, the valve element 12 moves forward and backward along the axial direction D12 together with the valve holder 142. The valve element 12 changes the opening area, that is, the opening degree, of the valve port 112 by the forward and backward movement of its front end along the axial direction D12. Moreover, the flow rate of the fluid flowing from the first joint 131 to the second joint 132 or from the second joint 132 to the first joint 131 is controlled to a flow rate corresponding to the opening degree of the valve port 112.
[0038] Here, in the present embodiment, the internal space of the valve chamber 111 that constitutes the valve body 11 and the second joint portion 114 for joining the second joint 132 on the side closer to the valve port 112 in the axial direction D12 are in the following relationship.
[0039] Figure 2 is a Figure 1 magnified view of the internal space of the valve chamber shown and the second joint portion for joining the second joint. This Figure 2 shows a magnified view of the valve body 11 and its peripheral portion and a magnified view of the axial cross-section along the line V11-V11. And, Figure 3 is a Figure 2 magnified view of the first region A11, the second region A12, and the third region A13 in Figure 3 (A) of Figure 3 shows a magnified view of the first region A11, Figure 3 (B) of
[0040] shows a magnified view of the second region A12, and
[0041] (C) of Figure 2 shows a magnified view of the third region A13.
[0042] AsFigure 3 As shown in (C), the second inner exposed portion 113a is the portion located on the outermost side in the radial direction D11 among the portions along the inner peripheral edge of the first joint 131 that join the first joint 131 of the first joint portion 113. The first joint portion 113 is composed of a large-diameter cylindrical through-hole 113b and a small-diameter cylindrical through-hole 113c that penetrate the side wall of the cylindrical valve body 11. The large-diameter cylindrical through-hole 113b is a through-hole formed along the outer periphery of the first joint 131. And the small-diameter cylindrical through-hole 113c is a through-hole that communicates with the large-diameter cylindrical through-hole 113b up to the valve chamber 111 and has a small diameter corresponding to the thickness of the first joint 131 along the inner periphery of the first joint 131. And at the stepped portion between the large-diameter cylindrical through-hole 113b and the small-diameter cylindrical through-hole 113c, the positioning of the valve chamber 111 side end portion of the first joint 131 is performed. The first joint 131 is inserted and brazed into the large-diameter cylindrical through-hole 113b. And the small-diameter cylindrical through-hole 113c is preferably chamfered so that the outer peripheral edge portion on the side of the first joint 131 substantially coincides with the inner peripheral edge of the first joint 131. The second inner exposed portion 113a is the portion located on the outermost side in the radial direction D11 among the portions that come into contact with the inner peripheral edge of the first joint 131 on the inner peripheral surfaces of the large-diameter cylindrical through-hole 113b and the small-diameter cylindrical through-hole 113c including the above-mentioned stepped portion. In addition, in the present embodiment, as described above, the second inner exposed portion 113a overlaps with the outermost edge 114a of the joint portion when viewed in the axial direction D12.
[0043] As Figure 3 As shown in (A), the third inner exposed portion 115b is located on the outer peripheral edge 115a of the lid joint portion 115 that faces the inner peripheral edge 181a of the housing 181 of the lid member 18. The valve body 11 side end portion of the housing 181 in the axial direction D12 is opened as a circular joint port. On the other hand, as Figure 2 and Figure 3As shown in (A) of , the lid joint portion 115 is configured to have an annular protruding portion 115c that protrudes in a circular shape centered on the axis L11. Further, the lid member 18 is fitted and joined to the annular protruding portion 115c such that the open end of the annular protruding portion 115c enters the inside of the joint port. The joint is performed by riveting to expand the open end of the annular protruding portion 115c and also by brazing using the filler metal 11a. The outer peripheral edge 115a of the annular protruding portion 115c is covered with the filler metal 11a and does not protrude, but the expanded diameter portion formed by riveting on the open end side of the annular protruding portion 115c is exposed in the internal space 116 as the boundary between the inside of the housing 181 and the internal space 116 of the valve body 11. Further, in the expanded diameter portion of the annular protruding portion 115c, the portion on the extension line of the outer peripheral edge 115a is the portion located on the outermost side in the radial direction D11 among the exposed portions of the lid joint portion 115 exposed in the internal space 116, and this portion becomes the above-described third internal exposed portion 115b. Further, in the present embodiment, the third internal exposed portion 115b is located on the inner side in the radial direction D11 than the outermost edge 114a of the joint portion. Further, the housing 181, the first joint 131, and the second joint 132 are formed by stamping a thin plate or the like, and are different from the metal bar of the raw material of the valve body 11, and thus there is no communication path caused by the following bubbles, and there is no possibility of fluid leakage to the outside.
[0044] In the present embodiment, among the first internal exposed portion 111a, the second internal exposed portion 113a, and the third internal exposed portion 115b described above, as Figure 2 shown, in the radial direction D11, the second internal exposed portion 113a becomes the outermost exposed portion 116b located on the outermost side. Further, as Figure 2 and Figure 3 shown in (C) of , when viewed in the axial direction D12, the outermost exposed portion 116b overlaps with the outermost edge 114a of the joint portion in the second joint portion 114 that joins the second joint 132.
[0045] Here, in the present embodiment, as Figure 2 and Figure 3As shown in (B) thereof, an annular fitting groove 117 into which the end portion of the second joint 132 is fitted is formed at the axial end portion of the valve body 11. Further, a chamfered portion 114c is formed at the outer edge portion of the fitting groove 117 by C chamfering. When the end portion of the second joint 132 is fitted into the fitting groove 114b, a joint recessed portion 114b is formed at the axial end portion of the valve body 11, which is demarcated by the outer peripheral surface of the second joint 132 and the chamfered portion 114c. The joint recessed portion 114b is formed in an annular shape centered on the axis L11 and has a groove shape with a triangular cross section in the radial direction D11. When molten solder 11a is filled into the joint recessed portion 114b, the solder 11a flows along the outer peripheral surface of the second joint 132 and the like to the inner peripheral side of the second joint 132 in the joint recessed portion 114b. By hardening the solder 11a flowing like this, the second joint 132 is connected to the valve body 11. In the present embodiment, the outer edge portion of the second joint portion 114 is constituted by the joint recessed portion 114b in which the chamfered portion 114c is formed as described above. In the joint recessed portion 114b, the solder 11a is filled so as to cover the outer edge up to the chamfered portion 114c. Further, the outer edge in the chamfered portion 114c of the joint recessed portion 114b constitutes the outermost joint edge 114a of the second joint portion 114 on the outermost side in the radial direction D12.
[0046] The valve device 10 of the present embodiment is configured as described above. According to this structure, the following effects can be obtained. Before explaining this effect, a comparative example of the valve device 10 of the present embodiment and problems of this comparative example will be described.
[0047] Figure 4 is Figures 1 to 3 A longitudinal sectional view of the valve device of the first comparative example of the valve device shown and an axial sectional view along the line V21-V21. And, Figure 5 is Figures 1 to 3 A longitudinal sectional view of the valve device of the second comparative example of the valve device shown and an axial sectional view along the line V31-V31. In addition, in the above Figure 4 and Figure 5 the same reference numerals are given to the common constituent elements between the two to show them.
[0048] Figure 4 The valve device 20 of the first comparative example shown and Figure 5 the valve device 30 of the second comparative example shown both have the following structure: A valve element 22 for changing the opening degree of the valve port 212 is formed in a cylindrical shape and is connected to the rotor shaft 262 of the stepping motor 26 on the inner side thereof. And, in the above comparative example, the second joint portion 214 for joining the second joint 232 becomes a cylindrical stepped recess communicating with the valve port 212, and the end portion of the second joint 232 is fitted into the second joint portion 214 and joined by hard soldering.
[0049] However, compared withFigures 1 to 3 The comparison points of the valve device 10 shown are not the structures of the valve element 22, the stepping motor 26, and the second joint portion 214 that are common between the first and second comparative examples. The comparison point here is the positional relationship between the outermost exposed portions 216b, 316b in the internal spaces 216, 316 of the valve chambers 211, 311 that constitute the valve bodies 21, 31 and the outermost joint portion outer edge 214a of the joint portion of the second joint portion 214 that is common in the two comparative examples and is the outermost on the radial direction D21 side.
[0050] First, in Figure 4 the valve device 20 of the first comparative example shown, the valve chamber 211 is a transverse hole formed in the cylindrical valve body 21 continuously with the small-diameter cylindrical through-hole 213c of the cylindrical first joint portion 213 that joins the first joint 231. Moreover, in the inner exposed portion 216a of the internal space 216 that constitutes the valve chamber 211, the outermost exposed portion 216b that is the outermost on the radial direction D21 side becomes the first inner exposed portion 211a on the inner wall surface of the valve chamber 211 that is the outermost on the radial direction D21 side. Also, in the valve device 20 of this first comparative example, the first inner exposed portion 211a, which is the outermost exposed portion 216b, is located on the inner side of the circular joint portion outer edge 214a in the second joint portion 214 in the longitudinal sectional view, but in the axial sectional view, it is located outside the circular joint portion outer edge 214a in the second joint portion 214 when viewed along the axial direction D22. As a result, as Figure 4 shown by the mesh-like hatching in the figure, the two corner portions on the side opposite to the first joint portion 213 of the rectangular valve chamber 211 protrude outside the circular joint portion outer edge 214a when viewed along the axial direction D22.
[0051] Next, in Figure 5 the valve device 30 of the second comparative example shown, the valve chamber 311 of the valve body 31 is located inside the circular joint portion outer edge 214a when viewed along the axial direction D22, and is formed into a circular cylindrical shape by boring or the like. On the other hand, in the valve device 30 of this second comparative example, the cylindrical first joint portion 313 that joins the first joint 331 is formed to be more on the valve chamber 311 side than Figure 4The first joint portion 213 of the first comparative example shown is a shallower cylindrical shape. As a result, in the valve device 30 of the second comparative example, the second inner exposed portion 313a, which is the portion of the first joint portion 313 along the inner peripheral edge of the first joint 331 and is located on the outermost side in the radial direction D21, becomes the outermost exposed portion 316b among the inner exposed portions 316a. Further, in the valve device 30 of the second comparative example, the second inner exposed portion 313a, which is the outermost exposed portion 316b, is located on the inner side in the radial direction D21 than the outermost edge 214a of the circular joint portion in the second joint portion 214 in a longitudinal sectional view, but in an axial sectional view, it is located on the outer side of the outermost edge 214a of the circular joint portion in the second joint portion 214 when viewed along the axial direction D22. As a result, as Figure 5 shown by the meshed hatching, two wedge-shaped portions between the first joint portion 313, which is rectangular when viewed along the axial direction D22, and the outermost edge 214a of the circular joint portion protrude outward from the outermost edge 214a of the joint portion. That is, when neither the longitudinal sectional view nor the axial sectional view is observed, it is difficult to determine whether the outermost exposed portion overlaps with the outermost edge of the second joint portion when viewed along the axial direction or is located on the inner side in the radial direction than the outermost edge of the joint portion.
[0052] Here, both the first comparative example and the second comparative example are configured such that the valve bodies 21 and 31 are the same as the valve body 11 in the Figures 1 to 3 valve device 10 shown, and are components formed by cutting a metal rod formed by stretching a metal block such as stainless steel or brass. At this time, when the valve bodies 21 and 31 are formed, the metal block that is the raw material sometimes contains minute air bubbles. If such a metal block is stretched to form a metal rod, the air bubbles are also stretched, and a continuous communication path may be formed in the axial direction D22.
[0053] As described above, both the first comparative example and the second comparative example are configured such that in the inner exposed portions 216a and 316a of the internal spaces 216 and 316 that constitute the valve chambers 211 and 311, there are portions that protrude outward from the outermost edge 214a of the joint portion in the second joint portion 214 when viewed along the axial direction D22. If the above-described communication path in the axial direction D22 is formed in such a protruding portion, the internal spaces 216 and 316 of the valve bodies 21 and 31 communicate with the external space, and there is a possibility that the fluid leaks to the outside. Thus, Figure 4 the valve device 20 of the first comparative example shown and Figure 5 the valve device 30 of the second comparative example shown both have the problem of the possibility of fluid leakage.
[0054] In Figures 1 to 3In the valve device 10 of the illustrated embodiment, in the first joint portion 113 and the second joint portion 114, the first joint 131 and the second joint 132 are joined to the valve body 11 by solder 11a. At this time, compared with the above-described comparative example, Figure 3 the second internal exposed portion 113a, which is the outermost exposed portion 116b of the internal space 116 of the valve body 11 as shown in (C) thereof, overlaps with the outermost edge 114a of the joint portion of the second joint portion 114 when viewed along the axial direction D12. Also, the first internal exposed portion 111a and the third internal exposed portion 115b are located on the inner side in the radial direction D11 with respect to the outermost edge 114a of the joint portion. According to the present embodiment, even if there is the above-described communication path in the axial direction D12, the outermost exposed portion 116b (second internal exposed portion 113a) overlaps with the outermost edge 114a of the joint portion of the second joint portion 114 when viewed along the axial direction D12. As a result, each part of the internal exposed portion 116a overlaps with the outermost edge 114a of the joint portion or is located inside thereof when viewed along the axial direction D12, so that the end portion of the communication path in the axial direction D12 is blocked by the solder 11a or the end portion of the second joint 114 in the axial direction D12, or is located in the flow path inside the second joint 114. Therefore, according to the present embodiment, the internal space 116 of the valve body 11 does not communicate with the external space, and leakage of fluid (external leakage) can be suppressed.
[0055] Here, in the present embodiment, the second joint portion 114 is constituted by a joint concave portion 114b having an annular and groove-like shape, and the solder 11a is filled in the joint concave portion 114b. According to this structure, the joint concave portion 114b becomes a solder accumulation portion, and the end portion of the above-described communication path in the axial direction D12 is effectively blocked by the solder 11a filled therein, so that leakage of fluid (external leakage) can be effectively suppressed.
[0056] Also, in the present embodiment, a chamfered portion 114c is formed at the outer edge portion of the joint concave portion 114b, and the outermost edge 114a of the joint portion is constituted by the outer edge of the chamfered portion 114c. According to this structure, for example, the solder 11a can be extended to the outer edge of the chamfered portion 114c by wettability or the like. As a result, in the second joint portion 114, the range capable of blocking the end portion of the communication path in the axial direction D12 can be expanded to the outside in the radial direction D11, so that leakage of fluid (external leakage) can be further effectively suppressed.
[0057] Also, in the present embodiment, the outermost exposed portion 116b is defined by the second inner exposed portion 113a among the exposed portion boundaries of three parts, namely, the first inner exposed portion 111a on the inner wall surface of the valve chamber 111, the second inner exposed portion 113a of the first joint portion 113, and the third inner exposed portion 115b of the lid joint portion 115. According to this structure, the shape of each part that can be conceived as the structure of the valve device 10 is preconceived, and the outermost exposed portion 116b of the valve body 11 is defined based on the shape of the first joint portion 113 among them. Moreover, the outermost exposed portion 116b under such preconception is configured to overlap with the outermost edge 114a of the joint portion when viewed along the axial direction D12, so that leakage (external leakage) of fluid can be further effectively suppressed.
[0058] Also, in the present embodiment, the lid joint portion 115 has an annular protrusion 115c, and the lid member 18 is fitted and joined to the annular protrusion 115c. According to this structure, by fitting with the annular protrusion 115c, the lid member 18 is joined to the valve body 11 in a well-balanced manner with the axis L11 as the center, so that the operation of the valve element inside the valve body 11 along the axial direction D12 can be made stable.
[0059] Also, in the present embodiment, the inner diameter of the valve chamber 111 is formed larger than the inner diameter of the first joint 131. According to this structure, the flow of fluid in the valve chamber 111 can be suppressed from having a pressure loss.
[0060] Next, a modification of the valve device 10 shown in Figures 1 to 3 will be described.
[0061] Figure 6 is Figures 1 to 3 a longitudinal sectional view of the valve device of the modification of the valve device 10 and an axial sectional view along the line V41-V41. In addition, the valve device 40 shown in this Figure 6 is also Figure 5 a modification of the valve device 30 of the second comparative example shown in Figure 6 . Therefore, Figure 5 in, the same reference numerals as those of the components shown in Figure 5 are assigned to the components equivalent to them, and hereinafter, the repeated description of the above equivalent components will be omitted.
[0062] The valve device 40 of this modification is a device that changes the opening degree of the valve port 212 by using a cylindrical valve element 22 that is internally connected to the rotor shaft 262 of the stepping motor 26. In the valve device 40 of this modification, the cylindrical first joint portion 413 that joins the first joint 431 is formed to be larger than Figure 5The first joint portion 313 of the second comparative example shown is a deeper cylindrical shape. Specifically, in the valve device 40 of the modified example, the first joint portion 413 is formed at a position where the second inner exposed portion 413a, which is the outermost side in the radial direction D21 in the first joint portion 413, overlaps with the outermost edge 214a of the circular joint portion in the second joint portion 214. As a result, in the valve device 40 of the modified example, the outermost exposed portion 416b, which is the outermost side in the radial direction D21 in the inner exposed portion 416a of the internal space 416 of the valve body 41, is the second inner exposed portion 413a and overlaps with the outermost edge 214a of the circular joint portion in the second joint portion 214 when viewed along the axial direction D22.
[0063] In the valve device 40 of the modified example described above, the outermost exposed portion 416b in the valve body 41 also overlaps with the outermost edge 214a of the joint portion of the second joint portion 214 when viewed along the axial direction D22. As a result, even if there is the communication path in the axial direction D12 as described above, the internal space 416 of the valve body 41 and the external space do not communicate, and leakage (external leakage) of the fluid can be suppressed, which is the same as Figures 1 to 3 the valve device 10 of the embodiment shown.
[0064] In addition, the embodiments and modified examples described above merely show representative modes of the present invention, and the present invention is not limited thereto. That is, various modifications can be made and implemented without departing from the gist of the present invention. Even such modifications, as long as they still have the structure of the valve device of the present invention, are of course included in the scope of the present invention.
[0065] For example, in the description of the above embodiments and modified examples, the applications of the valve devices 10 and 40 are not specified, but the valve devices 10 and 40 can be applied to the main body parts of various valves such as electric valves, mechanical expansion valves, manual on-off valves, and solenoid valves.
[0066] And, in the description of the above embodiments and modified examples, as an example of the outermost exposed portion, the outermost exposed portions 116b and 416b that overlap with the outermost edges 114a and 214a of the joint portions of the second joint portions 114 and 214 when viewed along the axial direction D12 are given. However, the outermost exposed portion is not limited thereto and may be located on the inner side in the radial direction D11 with respect to the outermost edge of the joint portion.
[0067] Also, in the descriptions of the above-described embodiments and modifications, as an example of the outermost exposed portion, the outermost exposed portions 116b and 416b defined by the second internal exposed portions 113a and 413a of the first joint portions 113 and 413 are given. However, the outermost exposed portion is not limited thereto. For example, it may be the first internal exposed portion in the valve chamber, the third internal exposed portion in the lid joint portion, etc., as long as it is the portion located outermost in the radial direction among the internal exposed portions exposed in the internal space of the valve body, and its specific form is not limited.
[0068] Also, in the descriptions of the above-described embodiments and modifications, as an example of the joining material of the first joint portion and the second joint portion, the solder 11a is given. However, the joining material is not limited thereto, and it may also be a melt in joining methods such as welding and cladding.
[0069] Also, in the description of the present embodiment, as an example of the second joint portion, the second joint portion 114 formed by the joint concave portion 114b that is circular and groove-shaped and filled with the solder 11a is given. And, in this example, a chamfered portion 114c is formed at the outer edge portion of the joint concave portion 114b, and the outer edge of this chamfered portion 114c constitutes the outermost edge 114a of the joint portion. However, the second joint portion is not limited thereto. For example, it may also be a member such as the second joint portion 114 of the modification shown in Figure 6 As shown, which is formed in a cylindrical shape and fits into the end portion of the second joint. However, as described above, according to the second joint portion 114 formed by the joint concave portion 114b that is circular and groove-shaped and filled with the solder 11a, the leakage (external leakage) of the fluid can be effectively suppressed by the solder 11a filled therein. And, by providing the chamfered portion 114c at the outer edge portion of the joint concave portion 114b, the range that can be blocked by the solder 11a is expanded outward in the radial direction D11, so that the leakage (external leakage) of the fluid can be further effectively suppressed, which is also as described above. In addition, in the descriptions of the present embodiment and modifications, as an example of the joint concave portion that is circular and groove-shaped, the joint concave portion 114b divided into the outer peripheral side by the chamfered portion 114c formed by C chamfering and having a triangular cross-section in the radial direction D11 is given. However, the joint concave portion is not limited to a groove having a triangular cross-section. For example, it may also be a stepped groove having a rectangular cross-section, a groove divided into the outer peripheral side by a curved chamfered portion formed by arc chamfering, etc.
[0070] Also, in the description of the present embodiment and the modified example, as an example of the outermost exposed portion, an example of the outermost exposed portions 116b and 416b defined by any one of the above-described first inner exposed portions 111a and 411a, second inner exposed portions 113a and 413a, and third inner exposed portions 115b is given. However, the outermost exposed portion is not limited thereto, and as described above, it may be any portion that is the outermost in the radial direction among the inner exposed portions exposed in the inner space of the valve body, and its specific form is not limited. However, by defining the outermost exposed portions 116b and 416b by any one of the three inner exposed portions that can be conceived as the structure of the valve device as described above, leakage (external leakage) of the fluid can be further effectively suppressed, as described above.
[0071] Also, in the description of the present embodiment and the modified example, as an example of the lid engaging portion, an example of the lid engaging portion 115 having the annular protrusion 115c is given. However, the lid engaging portion is not limited thereto, and any lid member can be engaged, and its specific form is not limited. However, according to the lid engaging portion 115 having the annular protrusion 115c, the operation of the valve element in the axial direction D12 can be stabilized, as described above.
[0072] Also, in the description of the present embodiment and the modified example, as an example of the valve chamber, an example of the valve chamber 111 whose inner diameter is formed larger than the inner diameter of the first joint 131 is given. However, the valve chamber is not limited thereto, and its inner diameter may be formed to be the same as or smaller than the inner diameter of the first joint. However, according to the valve chamber 111 whose inner diameter is formed larger than the inner diameter of the first joint 131, the fluid can flow while suppressing the pressure loss in the valve chamber 111, as described above.
[0073] As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific structure is not limited to the above embodiments, and design changes and the like within the scope not departing from the gist of the present invention are also included in the present invention.
Claims
1. A valve device includes a valve body that forms a valve chamber and a valve port, and a valve element that changes the opening degree of the valve port. A first joint is connected to the valve body in the radial direction, and a second joint is connected to the valve body in the axial direction. The valve device is characterized in that the valve body is formed in a cylindrical shape that extends integrally along the axial direction, has an internal space that includes the valve chamber and exposes the fluid inside the valve body, and a valve port and a second joint portion for engaging the second joint are provided on one end side of the valve body in the axial direction, and a first joint portion for engaging the first joint is provided on the side surface of the valve body in the radial direction. In the internal exposed portion that is exposed in the internal space of the valve body, the outermost exposed portion that is located on the outermost side in the radial direction overlaps with the outermost edge of the joint portion of the second joint portion that is located on the outermost side in the radial direction when viewed in the axial direction, or is located on the inner side in the radial direction compared to the outermost edge of the joint portion.
2. The valve device according to claim 1, characterized in that the outer edge of the second joint portion is constituted by a joint recess portion that is formed in an annular shape centered on the axis and is formed in a groove shape, and a brazing material is filled in the joint recess portion as a joint material.
3. The valve device according to claim 2, characterized in that a chamfered portion is formed in the joint recess portion, and the outermost edge of the joint portion is constituted by the outer edge of the chamfered portion.
4. The valve device according to any one of claims 1 to 3, characterized in that the valve body has a cover joint portion for joining a cover member on the other end side in the axial direction, the outermost exposed portion of the valve body is defined by any one of a first internal exposed portion, a second internal exposed portion, and a third internal exposed portion, wherein the first internal exposed portion is located on the outermost side in the radial direction on the inner wall surface of the valve chamber, the second internal exposed portion is located on the outermost side in the radial direction in the portion of the first joint portion along the inner peripheral edge of the first joint, the third internal exposed portion is located on the outer peripheral edge of the cover joint portion that faces the inner peripheral edge of the cover member.
5. The valve device according to claim 4, characterized in that the cover joint portion has an annular protruding portion that protrudes in an annular shape centered on the axis, and the cover member is fitted and joined to the annular protruding portion.
6. The valve device according to any one of claims 1 to 3, characterized in that the inner diameter of the valve chamber is formed to be larger than the inner diameter of the first joint.
Citation Information
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