Valve device

Abstract

The present invention provides a valve device capable of suppressing fluid leakage (external leakage). The valve device (10) is characterized by having a valve port (112) and a connector engagement portion for engaging a joint at one end of the valve body (11) along the axial direction (D12). The valve body (11) is formed as a cylindrical shape extending integrally along the axial direction (D11), and is configured to have a wall (113) that separates the internal space of the valve chamber (111) from the external space, a specific wall portion (113c) within this wall portion, and a specific internal exposed surface (113-1) of the specific wall portion. (113a) and a specific inner surface (113a) of a specific wall portion as an outer exposed surface (113-2) are provided with a sealing treatment portion (115). The specific wall portion (113c) is located further outward radially (D11) than the joint joint portion and has a shape in which the inner exposed surface (113-1) exposed in the inner space and the outer exposed surface (113-2) exposed in the outer space overlap each other back to back in the axial direction (D12).

Description

Technical Field

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

[0002] Nowadays, a valve device is widely used, which includes a valve body (valve housing) having a valve port, a valve core that changes the opening of the valve port, and a drive unit that drives the valve core to move forward and backward. In such a valve device, as a valve body, there is known a valve body formed by cutting a metal material such as stainless steel and brass (for example, refer to Patent Document 1). As a forming step of such a valve body, a metal block is stretched in the axial direction by extrusion, drawing, etc. to form a metal rod, and then the metal rod is cut and cut to form a valve chamber space, a valve seat portion, or a joint portion for joining a joint.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2019-044880 Summary of the invention

[0006] Problems to be solved by the invention

[0007] Here, in the conventional valve device described in Patent Document 1, when the valve body is formed, the metal block that becomes the raw material sometimes contains tiny bubbles. If such a metal block is stretched to form a metal rod, the bubbles are also stretched together, and sometimes a continuous communication path in the axial direction is formed. Moreover, in the valve device, if the internal space of the valve body and the external space are connected through such a communication path, there is a possibility that the fluid leaks to the outside.

[0008] An object of the present invention is to provide a valve device capable of suppressing leakage (external leakage) of a fluid.

[0009] Solutions to Solve Problems

[0010] The valve device of the present invention comprises a valve body constituting a valve chamber and a valve port, and a valve core for changing the opening of the above-mentioned valve port, and is characterized in that the above-mentioned valve port and a joint joint portion for joining a joint are provided on one axial end side of the above-mentioned valve body, the above-mentioned valve body is formed into a cylindrical shape extending as a whole along the above-mentioned axial direction, and is constructed to have a wall portion separating an internal space constituting the above-mentioned valve chamber from an external space, a sealing treatment portion is provided in a specific wall portion in the above-mentioned wall portion, and in at least one of a specific internal exposed surface in the above-mentioned specific wall portion as the above-mentioned internal exposed surface and a specific external exposed surface in the above-mentioned specific wall portion as the above-mentioned external exposed surface, the above-mentioned specific wall portion is located radially more outward than the above-mentioned joint joint portion, and has a shape in which the internal exposed surface exposed in the above-mentioned internal space and the external exposed surface exposed in the above-mentioned external space overlap axially back to back with each other.

[0011] According to the present invention, by providing the sealing portion, even if there is a communication path inside the specific wall portion, the axial end of the communication path is sealed by the sealing portion. As a result, the internal space of the valve body is not connected to the external space, and leakage of the fluid (external leakage) can be suppressed.

[0012] At this time, preferably, the sealing treatment portion is composed of a solder coating formed by attaching molten solder to at least one of the specific internal exposed surface and the specific external exposed surface. According to this structure, the molten solder penetrates from the opening of its attachment surface into the connecting path to form the solder coating, thereby improving the accuracy of the sealing treatment.

[0013] In addition, it is preferred that a recess is provided in the radial direction and the circumferential direction from a position closer to the outside of the joint joint in the radial direction to the joint and at least on the inside thereof including the specific external exposure surface, and the brazing material coating is provided in a manner of filling the recess. According to this structure, in the specific external exposure surface, it is easy to keep the molten brazing material in the outer periphery of the joint and to form a recess in the opening assumed area of ​​the communication path. As a result, it is easy to form a molten hardened layer based on the brazing material in the joint joint, and the accuracy of the sealing treatment at the specific external exposure surface can be further improved.

[0014] Furthermore, preferably, the sealing portion is composed of a plastic deformation portion formed by plastically deforming at least one of the specific internal exposed surface and the specific external exposed surface in the axial direction. According to this structure, the sealing portion is composed of the plastic deformation portion formed by plastically deforming a part of the wall portion of the valve body, so that no additional parts are required, the number of parts can be suppressed, and the sealing process can be easily performed.

[0015] Furthermore, preferably, a groove portion surrounding the valve opening and continuous in the circumferential direction is provided in the valve seat portion constituting the valve opening and continuous with the specific internal exposed surface. According to this structure, for example, in the case where the sealing treatment portion is constituted by a solder coating formed by attaching molten solder to the specific internal exposed surface, the flow of the molten solder can be restricted so as not to flow to the valve seat.

[0016] The effects of the invention are as follows.

[0017] According to the valve device of the present invention, leakage (external leakage) of the fluid can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a longitudinal sectional view showing the valve device according to the first embodiment of the present invention.

[0019] Figure 2 The figure shows that the fluid leakage (external leakage) caused by the communication path is prevented. Figure 1 A diagram showing the structure of a specific wall portion in a valve body.

[0020] Figure 3 It is shown Figure 2 The schematic diagram of the sealing treatment part shown is a state in which the end opening of the communication path is sealed.

[0021] Figure 4 It shows reference Figure 1 to Figure 3 A partial longitudinal sectional view of a first modified example of the valve device according to the first embodiment described above.

[0022] Figure 5 It shows reference Figure 1 to Figure 3 A partial longitudinal sectional view of a second modified example of the valve device according to the first embodiment described above.

[0023] Figure 6 It shows reference Figure 1 to Figure 3 A partial vertical cross-sectional view of a third modified example of the valve device according to the first embodiment described above.

[0024] Figure 7 1 and 2. A longitudinal sectional view showing a valve device according to a second embodiment of the present invention and an axial sectional view taken along line V41 - V41 in the figure.

[0025] In the figure:

[0026] 10, 20, 20', 30, 40—valve device, 11, 11', 31, 41—valve body, 12, 42—valve core, 18—cover member, 48—lower cover member, 111, 411—valve chamber, 112, 112', 412—valve port, 112a, 112a'—valve seat portion, 112b, 112b'—groove portion, 113, 313, 413—wall portion, 113-1, 413-1—inner exposed surface, 113-2, 413-2—outer exposed surface, 113a, 113a', 413a—specific inner exposed surface, 113a-1'—bottom surface, 113a-2'—inner inclined surface, 113b-1, 113b-1'—protruding end surface, 113b-2, 113b-2'— Root end face, 113b-3'—outer inclined surface, 113b, 113a', 313b, 413b—specific external exposed surface, 113c, 113c', 313c, 413c—specific wall portion, 113d, 313d, 413d—connecting path, 114, 314, 414—second joint (joint joint), 115, 115', 215, 315, 415—sealing treatment portion, 115a—brazing material, 116, 418—first joint, 131, 431—first joint, 132, 432—second joint (joint), 313i—recess, D11, D11', D41—radial direction, D12, D12', D42—axial direction, D13, D13', D43—circumferential direction. DETAILED DESCRIPTION

[0027] The following is based on Figure 1 to Figure 3 A valve device according to a first embodiment of the present invention will be described.

[0028] Figure 1 It is a longitudinal sectional view showing the valve device according to the first embodiment of the present invention.

[0029] First, based on Figure 1 A valve device 10 according to a first embodiment will be described. The valve device 10 is an electric valve including a valve body 11 constituting a valve chamber 111 and a valve port 112, and a valve core 12 for changing the opening of the valve port 112. In the valve device 10, a first joint 131 is connected to the valve body 11 in a radial direction D11, and a second joint 132 (joint) is connected to the valve body 11 in an axial direction D12 along the axis L11.

[0030] The valve body 11 is a component formed by cutting a metal rod formed by stretching a metal block such as stainless steel or brass. The valve body 11 is formed into a cylindrical shape centered on the axis L11 and extending in the axial direction D12 as a whole, and is configured to have a wall portion 113 that separates the internal space and the external space that constitute the valve chamber 111. The wall portion 113 has a barrel wall portion 113e and a bottom wall portion 113g. The barrel wall portion 113e is a portion extending in the axial direction D12 in the wall portion 113. The bottom wall portion 113g is a portion extending in the radial direction D11 in the wall portion 113 and having a valve seat portion 112a. On one end side of the axial direction D12 of the valve body 11, a cylindrical valve port 112 opening to the valve chamber 111 and a second joint portion 114 (joint joint portion) for joining a circular tubular second joint 132 are provided. Furthermore, a first joint 116 for joining a circular tubular first joint 131 is provided on the side surface in the radial direction D11 of the valve body 11. The fluid flows between the first joint 131 and the second joint 132 via the valve chamber 111 and the valve port 112, and the flow rate is adjusted by changing the opening of the valve port 112 by the valve core 12 accommodated in the valve chamber 111.

[0031] The valve core 12 is a round rod member whose front end is formed into a tapered shape, and is supported by a valve frame 141 in such a manner that the front end is located near the valve port 112. The valve frame 141 enters the interior of the valve chamber 111 from the end on the side opposite to the valve port 112 in the axial direction D12. Moreover, the valve core 12 is moved along the axial direction D12 in such a manner that the front end approaches or moves away from the valve port 112, thereby changing the opening of the valve port 112. In addition, the end of the valve core 12 on the side opposite to the valve port 112 is connected to the rotor shaft 162 of the stepping motor 16 for driving the valve core via the valve frame 141.

[0032] In addition, the lower end opening of the vertically long cap-shaped cover member 18 is joined to the opening on the other end side of the valve body 11 in the axial direction D12 on the side opposite to the valve port 112. The cover member 18 is airtightly fixed to the opening of the valve body 11 by welding or the like on the lower end opening side, forming a rotor chamber 181 for accommodating the rotor shaft 162 of the stepping motor 16 and the magnetic rotor 161.

[0033] In addition, a support member 142 is installed on the inner edge of the opening of the valve body 11 on the side of the cover member 18 to support the valve frame 141 so that it can move in the axial direction D12. The support member 142 is installed on the inner edge of the opening of the valve body 11 in the middle of the axial direction D12, and a guide space for accommodating the valve frame 141 and guiding it in the axial direction D12 is formed on the inner side of the valve body 11. The valve chamber 111 and the rotor chamber 181 are connected through the gap between the support member 142 and the valve frame 141. In addition, an internal thread portion is formed on the side of the support member 142 opposite to the valve port 112 to which the external thread portion of the rotor shaft 162 of the stepping motor 16 is threadedly engaged. The rotor shaft 162 enters the guide space of the valve frame 141 in the support member 142 in a state where the external thread portion and the internal thread portion are threadedly engaged, and its front end portion is connected to the end of the valve core 12 via the valve frame 141.

[0034] The stepping motor 16 includes a rotor shaft 162, a magnetic rotor 161 fixed to the rotor shaft 162, and a stator coil 163 arranged on the outer side of the cover member 18 in a manner corresponding to the magnetic rotor 161. By applying a pulse signal to the stator coil 163, the magnetic rotor 161 rotates in accordance with the number of pulses, and the rotor shaft 162 rotates. In this way, the rotor shaft 162 advances and retreats in the axial direction D12 by a screw feed mechanism composed of the external thread portion of the rotor shaft 162 and the internal thread portion of the support member 142, and the valve core 12 connected to the valve frame 141 advances and retreats together with the rotor shaft 162. As a result, the distance between the front end of the valve core 12 and the valve port 112 changes, and the opening of the valve port 112 changes.

[0035] In addition, the end of the rotor shaft 162 on the opposite side to the valve port 112 is inserted into the inner side of a cylindrical rotor guide 171 hanging from the end surface in the axial direction D12 of the inner surface of the cover member 18 and supported. In addition, a rotation stopper mechanism 172 for the magnetic rotor 161 is provided on the outer periphery of the rotor guide 171. The upper and lower limits of movement of the rotor shaft 162, that is, the valve core 12 in the axial direction D12 are defined by the rotation stopper mechanism 172.

[0036] By the above structure, when the stepping motor 16 is driven, the magnetic rotor 161 and the rotor shaft 162 rotate, and the rotor shaft 162 moves forward and backward along the axial direction D12 through the above-mentioned screw feed mechanism. The valve core 12 moves forward and backward along the axial direction D12 together with the valve frame 141 by the movement of the rotor shaft 162 accompanying the rotation. The valve core 12 changes the opening area, that is, the opening degree, of the valve port 112 by the movement of the front end portion thereof along the axial direction D12. In addition, 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 be a flow rate corresponding to the opening degree of the valve port 112.

[0037] Here, the valve body 11 is formed by cutting a metal rod formed by stretching a metal block as described above. Sometimes the metal block serving as the raw material contains tiny bubbles. If such a metal block is stretched to form a metal rod, the bubbles are also stretched together, and sometimes a continuous connecting path is formed in the axial direction D12. Moreover, if the internal space of the valve body is connected to the external space through the connecting path, there is a possibility that the fluid will leak to the outside. In addition, in the present embodiment, the stretching direction when forming the valve body 11 is the axial direction D12. Therefore, the connecting path is not formed continuously in the radial direction D11 of the valve body 11, so that in the barrel wall portion 113e of the valve chamber 111, the possibility that the internal space is connected to the external space is extremely low.

[0038] The wall portion 113 of the valve body 11 has a specific wall portion 113c located outside the second joint portion 114 in the radial direction D11 and having an internal exposed surface 113-1 exposed in the internal space and an external exposed surface 113-2 exposed in the external space overlapping each other back to back in the axial direction D12. Figure 1 In the figure, the inner exposed surface 113-1 and the outer exposed surface 113-2 in the wall portion 113 are schematically shown by thick lines, respectively, and the specific wall portion 113c is shown as a blank area in the wall portion 113 of the valve body 11 after removing the hatching. In the portion other than the specific wall portion 113c, the above-mentioned communication path is not continuously formed in the radial direction D11 of the valve body 11. On this basis, even if a communication portion in the axial direction D12 is formed inside, the end in the axial direction D12 is blocked by the welding portion with the first joint 131 and the cover member 18, the end of the second joint 132, or is located in the flow path of the second joint 132. Therefore, in the portion other than the specific wall portion 113c, there is no concern that the internal space of the valve body 11 is connected to the external space. On the other hand, regarding the above-mentioned specific wall portion 113c, the specific internal exposed surface 113a as the internal exposed surface 113-1 in the specific wall portion 113c and the specific external exposed surface 113b as the external exposed surface 113-2 in the specific wall portion 113c overlap each other back to back in the axial direction D12, so if a connecting path 113d shown by a dotted line in the figure is formed here, there is a concern that the internal space and the external space are connected. Therefore, in this embodiment, in order to suppress the leakage (external leakage) of the fluid caused by such a connecting path 113d, the following structure is provided in the specific wall portion 113c.

[0039] Figure 2 This is to show that in order to suppress the leakage (external leakage) of the fluid caused by the communication path, Figure 1 A diagram showing a structure in which a specific wall portion in a valve body is arranged.

[0040] If the Figure 2As shown in FIG. 1 , a sealing portion 115 is provided on the specific inner exposed surface 113a of the specific wall portion 113c and the specific outer exposed surface 113b in the valve body 11. When a communication path 113d is formed inside the specific wall portion 113c, the sealing portion 115 is a portion that seals the end opening in the axial direction D12 on the specific inner exposed surface 113a side as follows.

[0041] Figure 3 It is shown Figure 2 The schematic diagram of the sealing treatment part shown is a state in which the end opening of the communication path is sealed.

[0042] In the present embodiment, the sealing portion 115 is formed of a brazing material coating formed by melting an annular brazing material 115a provided on the specific inner exposed surface 113a of the specific wall portion 113c of the valve body 11 on the side of the cylinder wall portion 113e. Figure 3 (A) shows the annular solder 115a before melting. Figure 3 (B) shows the melted and flowing solder 115a. The melted solder 115a flows and spreads toward the valve port 112 side at the specific internal exposed surface 113a. At this time, if a communication path 113d is formed in the specific wall portion 113c, the melted solder 115a penetrates from the end opening and blocks the end opening.

[0043] Here, in the present embodiment, a groove portion 112b is provided in the valve seat portion 112a which continuously constitutes the valve port 112 with the specific internal exposed surface 113a, and surrounds the valve port 112 and is continuous in the circumferential direction D13. In addition, the groove portion 112b is provided in the valve seat portion 112a, which is located in the middle position closer to the inner side of the radial direction D11 than the second joint portion 114. The groove portion 112b is formed as a V-shaped groove having a V-shaped cross-sectional shape in the radial direction D11. The molten brazing material 115a flowing toward the valve port 112 side is accumulated in the groove portion 112b, thereby limiting the flow in front of the valve seat 112c opposed to the valve core 12 in such a manner that the brazing material 115a does not flow to the valve seat 112c. In addition, in the present embodiment, the groove portion 112b is formed in the valve seat portion 112a at a middle position away from the specific internal exposed surface 113a toward the inner side of the radial direction D11. However, the position of the groove portion 112b is not limited to such a position, and may be a boundary end portion between the valve seat portion 112a and the specific inner exposed surface 113a, that is, a position overlapping with the second joining portion 14 when viewed in the axial direction D12.

[0044] Then, the brazing material 115a that flows in this way hardens, thereby Figure 2 The sealing portion 115 shown is formed on the specific internal exposed surface 113 a so as to seal the end opening of the communication path 113 d .

[0045] According to the valve device 10 of the first embodiment described above, by providing the sealing portion 115, even if the communication path 113d exists inside the specific wall portion 113c, the end opening of the communication path 113d in the axial direction D12 is sealed by the sealing portion 115. As a result, the internal space of the valve body 11 is not communicated with the external space, and leakage of the fluid (external leakage) can be suppressed.

[0046] Here, in this embodiment, the sealing treatment portion 115 is composed of a solder coating formed by attaching molten solder 115a to a specific inner exposed surface 113a of a specific wall portion 113c. Figure 3 As shown in (B), the molten solder 115a penetrates from the end opening in the attachment surface to the connecting passage 113d to form a solder coating, thereby improving the accuracy of the sealing process. In addition, in this embodiment, the sealing process is performed by the annular solder 115a provided on the specific internal exposed surface 113a, but it is not limited to this, and the sealing process can also be performed by brazing with a rod-shaped solder.

[0047] Furthermore, in the present embodiment, the valve seat portion 112a continuous with the specific internal exposed surface 113a is provided with a groove portion 112b surrounding the valve port 112 and continuous in the circumferential direction D13. According to this structure, in the case where the sealing treatment portion 115 is formed by a solder coating formed by attaching the molten solder 115a to the specific internal exposed surface 113a, the flow of the molten solder 115a can be restricted in such a way that it does not flow to the valve seat 112c. In addition, in the present embodiment, the groove portion 112b is formed by a V-shaped groove, but is not limited thereto, and may also be formed by a circular arc groove, a square groove, etc.

[0048] Next, for reference Figure 1 to Figure 3 A modified example of the valve device 10 of the first embodiment will be described.

[0049] Figure 4 It shows reference Figure 1 to Figure 3 A partial longitudinal sectional view of a first modified example of the valve device of the first embodiment described above, Figure 5 It shows reference Figure 1 to Figure 3 A partial longitudinal sectional view of a second modified example of the valve device of the first embodiment described above. Figure 6 It shows reference Figure 1 to Figure 3 A partial longitudinal sectional view of a third modified example of the valve device of the first embodiment described above. Figures 4 to 6 In, with Figure 1 to Figure 3 Among the components equivalent to the components of the first embodiment shown in the figure, the components necessary for the description are denoted by Figure 1 to Figure 3 The same symbols are used to omit repeated descriptions of these components. Figures 4 to 6 In Figure 4 and Figure 6 In the embodiment, the partial cross-sectional view of the valve device 20, 30 of each modified example is shown as Figure 1 to Figure 3 On the other hand, Figure 5 In the partial cross-sectional view, it is shown as Figure 1 to Figure 3 Same direction.

[0050] First, in the valve device 20 of the first modified example, as Figure 4 As shown, a sealing treatment portion 215 is provided on a specific external exposed surface 113b of a specific wall portion 113c in the wall portion 113 of the valve body 11. In the wall portion 113 of the valve body 11, the specific external exposed surface 113b is composed of an annular protrusion end face 113b-1 of a cylindrical protrusion for embedding the cylindrical second joint 132 and an annular root end face 113b-2 extending from its root to the outside of the radial direction D11. Both the protrusion end face 113b-1 and the root end face 113b-2 are surfaces extending back to back along the radial direction D11 with the specific internal exposed surface 113a. In addition, the root end face 113b-2 is continuous with the joint side end face 113f on the side of the second joint 132 in the cylindrical wall portion 113e, which is further outside, to form the same surface.

[0051] In this modification, the sealing portion 215 composed of the solder coating is formed on the protruding end face 113b-1, the root end face 113b-2 and the joint side end face 113f. Thus, even if a connecting path 113d is formed in the specific wall portion 113c, its end opening is sealed from the specific external exposed surface 113b.

[0052] Furthermore, in this modification, as in the first embodiment, a groove portion 112b is formed in the valve seat portion 112a. In this modification, a sealing treatment portion 215 is formed on the specific internal exposure surface 113a in addition to the specific external exposure surface 113b. In this case, the groove portion 112b plays a role in limiting the flow of the molten solder as described above. In addition, the groove portion 112b provided in the valve seat portion 112a can also be provided at any position of the valve seat portion 112a as described above. Furthermore, unlike the first modification described so far and the first embodiment described above, when a sealing treatment portion is formed on both the specific internal exposure surface and the specific external exposure surface, the following structure can also be provided in the valve body. That is, a limiting structure such as a groove that can limit the flow of the molten solder in front of the valve seat can also be provided at a position further outside than the valve seat portion.

[0053] Here, in the first modification described above, the side surface 113h which is continuous from the root end surface 113b-2 to the protrusion end surface 113b-1 perpendicular to the axial direction D12 may not be the specific external exposed surface 113b, and the sealing treatment portion 215 is not formed. Figure 5In the second modified example described above, the formation range of the sealing treatment portion is different.

[0054] In addition, in the second modification example, Figure 5 In, from Figure 1 to Figure 4 Among the symbols shown, symbols necessary for the explanation are extracted and indicated by “'”, and additional symbols are also indicated by “'”.

[0055] In this Figure 5 In the valve device 20' of the second modified example shown, in the specific wall portion 113c', the outer diameter is narrowed in the axial direction D12' and extends to the protruding end surface 113b-1', and the outer inclined surface 113b-3' is continuously formed in the circumferential direction D13'. In this second modified example, the outer inclined surface 113b-3' has a portion extending in the radial direction D11', and thus becomes a part of the specific external exposed surface 113b'. In addition, in the valve device 20' of the second modified example, the specific internal exposed surface 113a' has: a bottom surface 113a-1' which is continuous with the valve seat portion 112a'; and an inner inclined surface 113a-2' which extends from the bottom surface 113a-1' to the inner surface 113e-1' of the cylinder wall portion 113e' in a manner that the inner diameter expands in the axial direction D12' and is continuously formed in the circumferential direction D13'. The inner inclined surface 113 a - 2 ′ also has a portion extending along the radial direction D11 ′, and thus becomes a part of the specific inner exposed surface 113 a ′.

[0056] Furthermore, in the valve device 20' of the second modified example, a sealing portion 115' is formed on both the specific inner exposed surface 113a' including the inner inclined surface 113a-2' and the specific outer exposed surface 113b' including the outer inclined surface 113b-3'. In addition, in this modified example, the sealing portion 115' of the specific outer exposed surface 113b' is also formed to extend to the joint side end surface 113f' of the cylinder wall portion 113e'.

[0057] In addition, as described above, in a specific wall portion 113c' having a specific internal exposed surface 113a' including an inner slope 113a-2' and a specific external exposed surface 113b' including an outer slope 113b-3', it is also possible, unlike this variant, to form a sealing processing portion 115' only on either the specific internal exposed surface 113a' or the specific external exposed surface 113b'.

[0058] In this modification, as in the first embodiment, a groove 112b' is formed in the valve seat 112a'. When the sealing portion 115' is formed on the specific inner exposed surface 113a', the groove 112b' serves to restrict the flow of the molten brazing material as described above.

[0059] Next, refer to Figure 6 The third modified example is described. In the valve device 30 of the third modified example, first, the joint shape of the valve body 31 and the second joint 132 is different from the first embodiment and the first modified example described above. In the third modified example, the bottom wall 313g of the wall portion 313 of the valve body 31 on the joint side with the second joint 132 is formed as a thick wall, and a cylindrical recess 313h is formed for the end of the second joint 132 to be inserted and brazed.

[0060] Furthermore, an annular recess 313i is continuously provided on the specific external exposed surface 313b of the specific wall portion 313c along the radial direction D11 and the circumferential direction D13 from the position of the second joint portion 314 (joint joint portion) to which the second joint 132 is brazed to the second joint 132, from the position closer to the outside of the radial direction D11. The recess 313i is formed by crossing the specific external exposed surface 313b of the specific wall portion 313c in a manner including the specific external exposed surface 313b on its inner side and extending to the middle of the joint side end surface 313f of the barrel wall portion 313e on its outer peripheral side. Furthermore, the sealing treatment portion 315 is formed by the brazing material coating that is set to fill the recess 313i. Thus, the communication path 313d in the specific wall portion 313c blocks its end opening from one side of the specific external exposed surface 313b. Furthermore, in this modification, as in the first embodiment and the first modification, a groove portion 112b is formed in the valve seat portion 112a. In this modification, the recess 313i is formed to extend to the outer peripheral side of the specific external exposure surface 313b in the radial direction D11. However, the recess is not limited thereto and may be formed at a position overlapping the specific external exposure surface 313b so as not to be exposed when viewed along the axial direction D12.

[0061] It goes without saying that according to the valve devices 20, 20', 30 of the first to third modified examples described above, the internal space of the valve body 11, 11', 31 is not connected to the external space, and leakage of the fluid (external leakage) can be suppressed.

[0062] In addition, in the valve device 30 of the third modified example described above, the sealing treatment portion 315 is formed by providing a recess 313i on the specific external exposure surface 313b and providing a brazing material coating in a manner that fills the recess 313i. According to this structure, in the specific external exposure surface 313b, it is easy to hold the molten brazing material in the recess 313i formed in the opening assumed area of ​​the communication path 313d on the outer periphery of the second joint 132. As a result, it is easy to form a molten hardened layer based on the brazing material in the second joint 314, and the accuracy of the sealing treatment at the specific external exposure surface 313b can be further improved.

[0063] Next, a second embodiment will be described.

[0064] Figure 7 1 and 2. A longitudinal sectional view showing a valve device according to a second embodiment of the present invention and an axial sectional view taken along line V41 - V41 in the figure.

[0065] In this Figure 7 In the valve device 40 shown, in the valve body 41, an annular insertion groove 417 is formed at the end of the valve body 41 on the valve port 412 side, into which the end of the second joint 432 (joint) is inserted. The end of the second joint 432 is inserted into the insertion groove 417, and the brazing material 419 is filled and melted from the outside in the radial direction D41 at the inner corner formed by the outer peripheral surface of the second joint 432 and the outer peripheral end surface of the insertion groove 417. In this way, the molten brazing material 419 flows along the outer peripheral surface of the second joint 432 to the inner peripheral side of the second joint 432 in the insertion groove 417. By hardening the brazing material 419, a second joint 414 (joint joint) formed by joining the second joint 432 to the valve body 41 is formed.

[0066] In addition, a valve guide member 441 is pressed into the opening of the valve body 41 on the side opposite to the valve port 412, and the valve core 42 penetrates the center thereof in a manner that allows it to move in the axial direction D42 along the axis L41. The valve core 42 moves forward and backward along the axial direction D42 in a state where the conical front end enters the valve port 412 through the valve guide member 441, and the opening of the valve port 412 is changed by the forward and backward movement. In addition, the end of the valve core 42 on the side opposite to the valve port 412 is connected to the rotor shaft of the stepping motor (not shown) via the valve frame 442. In addition, the lower end opening of the cylindrical lower cover member 48 is joined to the opening of the valve body 41 on the side opposite to the valve port 412 in a manner that accommodates the valve frame 442, the rotor shaft, etc. The lower cover member 48 is airtightly fixed to the opening of the valve body 41 by brazing or the like on the lower end opening side.

[0067] Here, in the present embodiment, in the wall portion 413 of the valve body 41, a specific wall portion 413c is located on the outside of the second joint portion 414 in the radial direction D41, and has a shape in which the inner exposed surface 413-1 and the outer exposed surface 413-2 overlap each other back to back in the axial direction D42, and the specific wall portion 413c is located on the cylinder wall portion 413e. In addition, the specific inner exposed surface 413a as the inner exposed surface 413-1 of the specific wall portion 413c mentioned here is a surface exposed on the inner side of the lower cover member 48. And the inner side of the lower cover member 48 is communicated with the valve chamber 411, and constitutes a part of the internal space 416. That is, the internal space 416 includes the inner side of the lower cover member 48 and the valve chamber 411. In the present embodiment, the side of the lower cover member 48 opposite to the valve body 41 is open, and the lower end opening of the elongated cap-shaped cover member (not shown) is joined to the opening.

[0068] The specific external exposed surface 413b in the specific wall portion 413c is an outer surface that overlaps the specific internal exposed surface 413a back to back in the axial direction D42. In addition, as shown in the axial cross-sectional view on the lower side of the figure, the specific wall portion 413c has a C-shaped cross-sectional shape. The inner contour of the C-shaped cross-sectional shape becomes a curve along the outer periphery of the second joint 432 of the circular tube shape. In this embodiment, the first joint 431 is joined in a manner that the two ends of the inner contour penetrate the wall portion 413 from the radial direction D41 and roughly overlap with the inner edge of the first joint 431 joined to the valve body 41. As a result, even if a connecting path is formed in the axial direction D42 between the ends of the specific wall portion 413c having a C-shaped cross-sectional shape, it is cut off by the brazing material of the first joint 431 and the first joint 418 in the middle. In other words, the connecting path at this part does not connect the internal space 416 with the external space. On the other hand, if a connecting passage 413d of the axial direction D42 is formed inside the specific wall portion 413c, there is a concern that the internal space 416 is connected to the external space. Therefore, in this embodiment, in order to suppress the leakage of the fluid (external leakage) caused by such a connecting passage 413d, the following sealing processing part 415 is provided in the specific wall portion 413c. In addition, the lower cover part 48, the first joint 431, and the second joint 432 are formed by stamping from a thin plate, etc., and are different from the metal rod of the raw material of the valve body 41, so the connecting passage will not be generated due to the above-mentioned bubbles, and the possibility of fluid leakage to the outside is extremely low.

[0069] The sealing treatment part 415 in this embodiment is composed of a plastic deformation part, which is formed by plastically deforming a specific internal exposed surface 413a having a C-shaped specific wall part 413c when viewed from the axial direction D42 along the axial direction D42. The plastic deformation is performed by pressing the end of a cylindrical compression fixture A41 to the specific internal exposed surface 413a and compressing it along the axial direction D42 before installing the lower cover component 48. After the plastic deformation, the compression fixture A41 is removed, and the lower cover component 48 is installed. In addition, the above-mentioned plastic deformation can also be performed after the lower cover component 48 is joined to the valve body 41.

[0070] According to the valve device 40 of the second embodiment described above, the sealing portion 415 provided on the specific inner exposed surface 413a of the specific wall portion 413c is used to seal the end opening of the communication path 413d on the inner space 416 side. As a result, the inner space 416 of the valve body 41 is not communicated with the outer space, and leakage of the fluid (external leakage) can be suppressed.

[0071] In addition, in the present embodiment, the sealing portion 415 is formed by a plastic deformation portion. According to this structure, the sealing portion 415 is formed by a plastic deformation portion formed by plastically deforming a part of the wall portion 413 of the valve body 41, so no additional parts are required, the number of parts can be suppressed, and the sealing process can be easily performed.

[0072] In addition, the first and second embodiments and the first to third modified examples described above are merely representative embodiments of the present invention, and the present invention is not limited thereto. That is, various modifications can be made without departing from the gist of the present invention. Even such modifications are of course included in the scope of the present invention as long as they still have the structure of the valve device of the present invention.

[0073] For example, in the description of the first and second embodiments and the first to third modifications, the application of the valve devices 10 to 40 is not specified. The valve devices 10 to 40 can be applied to various valves such as electric valves, mechanical expansion valves, manual on-off valves, and solenoid valves.

[0074] Furthermore, in the description of the first and second embodiments and the first to third modified examples, as an example of a valve device, an example of a valve device 10 to 40 in which the valve ports 112, 112', 412 are integrally formed with the valve bodies 11 to 41 is given. However, the valve device is not limited thereto, and the valve seat member having the valve port and the valve body may be formed independently.

[0075] In the description of the first and second embodiments, as an example of the sealing treatment portion, the sealing treatment portion 115, 415 is provided only on the specific inner exposed surface 113a, 413a of the specific wall portion 113c, 413c. In the description of the first and third modified examples, the sealing treatment portion 215, 315 is provided only on the specific outer exposed surface 113b, 313b of the specific wall portion 113c, 313c. However, the sealing treatment portion is not limited to this, and for example, it may be provided on both the specific inner exposed surface 113a' and the specific outer exposed surface 113b' of the specific wall portion 113c' as described in the second modified example. Furthermore, in the description of the first embodiment and the first to third modified examples, the sealing treatment parts 115, 115', 215, 315 are exemplified as being formed with a solder coating by slightly extending inward and outward of the radial direction D11, D11' of the specific internal exposed surface 113a, 113a' and the specific external exposed surface 113b, 113b' and 313b of the specific wall portion 113c, 113c' and 313c. However, the sealing treatment part is not limited thereto, and as long as it is provided on at least one of the specific internal exposed surface and the specific external exposed surface of the specific wall portion, it may also be provided only within the surface of the specific internal exposed surface and the specific external exposed surface. Furthermore, even in the case where the solder coating is formed by extending outside the surface of the specific internal exposed surface and the specific external exposed surface, its specific extension method can be appropriately set.

[0076] In addition, in the description of the first embodiment and the first to third variants described above, as an example of a sealing treatment portion, an example of a sealing treatment portion 115, 115', 215, 315 consisting of a solder coating formed by attaching molten solder is cited. However, the sealing treatment portion is not limited to this, for example, it can also be a sealing treatment portion 415 consisting of a plastic deformation portion as in the second embodiment. Moreover, even a sealing treatment portion consisting of an attached material attached to a specific internal exposed surface or a specific external exposed surface of a specific wall portion is not limited to being composed of the above-mentioned solder coating. For example, it can also be composed of various films formed by coating, anodized coating treatment such as corrosion-resistant aluminum, or spraying of a molten metal sealing treatment agent or a resin sealing treatment agent. However, according to the sealing treatment portion 115, 115', 215, 315 consisting of a solder coating, the accuracy of the sealing treatment can be improved as described above.

[0077] Furthermore, in the description of the third variant, as an example of a solder coating constituting a sealing treatment portion, an example of a solder coating constituting a sealing treatment portion 315 is cited in which a recess 313i provided on a specific external exposure surface 313b is buried. However, the solder coating is not limited thereto, and for example, it may be formed without providing recesses on the specific internal exposure surfaces 113a, 113a' and the specific external exposure surfaces 113b, 113b' as shown in the first embodiment and the first and second variants. However, by providing the recess 313i on the formation surface of the solder coating, it is easy to form a melt-hardened layer based on the solder at the joint joint, and the accuracy of the sealing treatment at the specific external exposure surface 313b can be further improved, as described above.

[0078] Furthermore, in the description of the third modified example, as an example of a recessed portion for accumulating brazing material, an example of a recessed portion 313i formed in a manner that crosses the specific external exposure surface 313b of the specific wall portion 313c and extends to the middle of the joint side end surface 313f of the cylindrical wall portion 313e on the outer peripheral side thereof is cited. However, the recessed portion is not limited thereto, and as long as it is provided in a range that is continuous from a position radially outward from the joint joint portion in the radial direction and circumferential direction to the joint and at least includes the specific external exposure surface on the inner side, the specific formation range and the like can be appropriately set.

[0079] Furthermore, in the description of the second embodiment described above, as an example of a sealing portion, an example of a sealing portion 415 composed of a plastic deformation portion is given. However, the sealing portion is not limited thereto, and for example, may be composed of a brazing material coating as in the first embodiment, the first and third modified examples. However, if the sealing portion 415 is composed of a plastic deformation portion formed by deforming a portion of the wall portion of the valve body, no additional components are required, the number of components can be suppressed, and the sealing process can be easily performed, as described above.

[0080] Furthermore, in the description of the second embodiment described above, as an example of the plastic deformation portion constituting the sealing treatment portion, an example of a plastic deformation portion formed on the specific internal exposed surface 413a by the pressing of the end of the cylindrical compression fixture A41 is given. However, the plastic deformation portion is not limited to this, and may be formed by pressing of a fixture of other shapes other than the cylindrical shape, or may be formed by other than the pressing of the fixture, such as shot peening, etc. Furthermore, the formation location of the plastic deformation portion is not limited to the specific internal exposed surface of the specific wall portion, but may be the specific external exposed surface, and may be both the specific internal exposed surface and the specific external exposed surface.

[0081] In the description of the first embodiment and the first to third modified examples, as an example of a valve body, an example of a valve body 11, 11', 31 is provided with grooves 112b, 112b' surrounding the valve ports 112, 112' and continuous in the circumferential directions D13, D13' on the valve seat 112a, 112a'. However, the valve body is not limited thereto, and no groove may be provided on the valve seat. However, by providing the grooves 112b, 112b', the flow of the molten brazing material 115a can be restricted in such a manner that it does not flow to the valve seats 112c, 112c', as described above.

[0082] Furthermore, in the description of the first embodiment described above, as an example of a valve body having a groove portion in the valve seat portion, an example of a valve body 11 having a sealing portion 115 formed on a specific internal exposed surface 113a continuous with the valve seat portion 112c is given. Furthermore, in the description of the first and third modified examples, examples of valve bodies 11 and 31 having sealing portions 215 and 315 formed on specific external exposed surfaces 113b and 313b on the side opposite to the side where the groove portion 112b is formed are given. In addition, in the description of the second modified example, an example of a valve body 11' having a sealing portion 115' formed on both the specific internal exposed surface 113a' on the side where the groove portion 112b' is formed and the specific external exposed surface 113b' on the opposite side is given. However, the valve body having a groove portion in the valve seat portion is not limited to this, and the sealing portion of the brazing material coating may be provided on the specific internal exposed surface on the side where the groove portion is formed, regardless of whether the sealing portion is formed on the specific external exposed surface. However, as described above, when the sealing portion is provided only on the specific internal exposed surface, the position of the groove portion of the valve seat portion may be the middle position of the valve seat portion in the radial direction, or may be the boundary end with the specific internal exposed surface. In addition, the groove portion may be provided on the valve seat portion, and the sealing portion of the plastic deformation portion may be provided on the specific external exposed surface. In this case, the sealing portion of the solder coating may be provided on the specific internal exposed surface continuous with the valve seat portion.

[0083] As mentioned above, the embodiment of the present invention has been described in detail with reference to the drawings, but the specific structure is not limited to the above-mentioned embodiment, 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 comprising a valve body constituting a valve chamber and a valve port, and a valve element for changing the opening of the valve port, characterized in that: The valve port and a joint joint portion for joining a joint are provided on one axial end side of the valve body. The valve body is formed in a cylindrical shape extending in the axial direction as a whole, and is configured to have a wall portion that separates an inner space constituting the valve chamber from an outer space. A sealing treatment portion is provided in a specific wall portion in the above-mentioned wall portion, and in at least one of a specific internal exposed surface in the above-mentioned specific wall portion as an internal exposed surface and a specific external exposed surface in the above-mentioned specific wall portion as an external exposed surface, the above-mentioned specific wall portion is located radially outer than the above-mentioned joint joint portion, and has a shape in which the above-mentioned internal exposed surface exposed in the above-mentioned internal space and the above-mentioned external exposed surface exposed in the above-mentioned external space overlap axially back to back with each other.

2. The valve device according to claim 1, characterized in that The sealing treatment portion is composed of a brazing material coating formed by attaching molten brazing material to at least one of the specific inner exposed surface and the specific outer exposed surface.

3. The valve device according to claim 2, characterized in that A recessed portion is provided in a range located outside the joint joint portion in the radial direction and including at least the specific externally exposed surface, and the brazing material coating is provided so as to fill the recessed portion.

4. The valve device according to claim 1, characterized in that The sealing treatment portion is composed of a plastic deformation portion formed by plastically deforming at least one of the specific inner exposed surface and the specific outer exposed surface in the axial direction.

5. The valve device according to any one of claims 1 to 4, characterized in that: A groove portion that surrounds the valve port and is continuous in the circumferential direction is provided in the valve seat portion that constitutes the valve port and is continuous with the specific inner exposed surface.

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