JP7404304B2 - valve device - Google Patents

Description

The present invention relates to a valve device.

Conventionally, valve devices have been widely used that include a valve body (valve housing) having a valve port, a valve body that changes the opening degree of the valve port, and a drive unit that drives the valve body forward and backward. Among such valve devices, one is known in which the valve body is formed by cutting a metal material such as stainless steel or brass (see, for example, Patent Document 1). The procedure for forming such a valve body is to form a metal rod by stretching the metal block in the axial direction by extrusion or drawing, and then cut this metal rod and perform a cutting process to form a valve chamber inside. It forms a space or a valve seat, or a connection part for connecting a joint.

JP2019-044880A

Here, in the conventional valve device as described in Patent Document 1, fine air bubbles may be contained in the metal lump that is the raw material during molding of the valve body. When such a metal lump is stretched to form a metal rod, the air bubbles may also be stretched, resulting in the formation of a continuous communication path in the axial direction. In the valve device, if the internal space and external space of the valve body are communicated with each other through such a communication path, fluid may leak to the outside.

An object of the present invention is to provide a valve device that can suppress fluid leakage (external leakage).

The valve device of the present invention includes a valve body that constitutes a valve chamber and a valve port, and a valve body that changes the opening degree of the valve port, and a first joint is connected to the valve body from a radial direction. , a valve device to which a second joint is connected from the axial direction, wherein the valve body is formed in an overall cylindrical shape extending in the axial direction, and is provided with an internal space constituting the valve chamber; The valve port and a second joint portion for joining the second joint are provided on one end of the valve body in the radial direction, and the first joint is provided on the side surface of the valve body in the radial direction. A first joint part is provided for joining the valve body, and the outermost exposed part located furthest in the radial direction among the internal exposed parts exposed to the internal space of the valve body is the most exposed part of the second joint part. It is characterized in that it overlaps the outermost edge of the radially outer joint part when viewed in the axial direction, or is located inside the outermost edge of the joint part in the radial direction.

First, at the first joint and the second joint, the first joint and the second joint are joined to the valve body by a joining material such as a filler metal in brazing or a molten material in a joining method such as welding or welding. becomes. According to the present invention as described above, even if the above-described axial communication path exists on the radially inner side of the outermost exposed portion, this outermost exposed portion The axial end of the communication path is not blocked by the bonding material or the second joint because it overlaps the outermost edge of the joint on the outside of the direction, or is located radially inward from the outermost edge of the joint. or located in the flow path inside the second joint. As a result, the internal space and external space of the valve body are not communicated with each other, and leakage of fluid (external leakage) can be suppressed.

At this time, the outer edge of the second joint part is composed of a joint recess formed in an annular groove shape centered on the axis, and the joint recess is filled with a brazing material as a joining material. suitable. According to this configuration, the joining recess becomes a solder reservoir, and the axial end of the communication path as described above is effectively blocked by the brazing filler metal filled therein, so that fluid leakage (external leakage) occurs. ) can be effectively suppressed.

Furthermore, it is preferable that a chamfer is formed in the joint recess, and the outer edge of the chamfer constitutes the outermost edge of the joint. According to this configuration, the brazing material can be extended to the outer edge of the chamfered portion due to its wettability, for example. As a result, at the second joint, the range in which the axial end of the communication passage can be closed can be expanded radially outward, making it possible to more effectively suppress fluid leakage (external leakage). can.

Further, the valve body has a lid joint portion for joining a lid member on the other end side in the axial direction, and the outermost exposed portion of the valve body is located at the inner wall surface of the valve chamber at the most radial end. a first internally exposed portion located on the outer side in the radial direction; a second internally exposed portion located on the outermost side in the radial direction among the portions along the inner peripheral edge of the first joint in the first joint portion; and the lid. and a third internal exposed portion located at an outer peripheral edge opposite to an inner peripheral edge of the lid member at the joint portion. According to this configuration, the structure of the valve device is such that the outermost exposed part of the valve body has the shape of the inner wall of the valve chamber, the shape of the joint with the first joint connected from the radial direction, and the shape of the joint with the lid member. It is defined in any imaginable shape. Under such an assumption, the outermost exposed part overlaps the outermost radially outer joint edge of the second joint part when viewed in the axial direction, or is radially inner than the outermost joint edge of the second joint part. Therefore, leakage of fluid (external leakage) can be more effectively suppressed.

Further, it is preferable that the lid joint portion has a circular protrusion that protrudes in an annular shape centered on the axis, and that the lid member is fitted and joined to the circular protrusion. According to this configuration, the lid member is joined to the valve body in a well-balanced manner around the axis by fitting with the annular protrusion, so that the axial movement of the valve body inside the valve body is controlled. It can be stabilized.

Further, it is preferable that the inner diameter of the valve chamber is larger than the inner diameter of the first joint. According to this configuration, fluid can flow while suppressing pressure loss within the valve chamber.

According to the valve device of the present invention, leakage of fluid (external leak) can be suppressed.

FIG. 1 is a longitudinal cross-sectional view of a valve device according to an embodiment of the present invention, and an axial cross-sectional view taken along the line V11-V11. FIG. 2 is an enlarged view of an internal space constituting the valve chamber shown in FIG. 1 and a second joint portion for joining a second joint. 3 is an enlarged view of each of a first area A11, a second area A12, and a third area A13 in FIG. 2. FIG. FIG. 3 is a vertical cross-sectional view of a valve device of a first comparative example with respect to the valve devices shown in FIGS. 1 to 3, and an axial cross-sectional view taken along the line V21-V21. FIG. 3 is a vertical cross-sectional view of a valve device of a second comparative example with respect to the valve devices shown in FIGS. 1 to 3, and an axial cross-sectional view taken along the line V31-V31. FIG. 3 is a longitudinal cross-sectional view of a modified valve device with respect to the valve device 10 shown in FIGS. 1 to 3, and an axial cross-sectional view taken along the line V41-V41.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A valve device according to an embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 1 is a longitudinal sectional view and an axial sectional view taken along the line V11-V11 of a valve device according to an embodiment of the present invention.

Next, a valve device 10 of one embodiment will be described based on FIG. 1. This valve device 10 is an electric valve that includes a valve body 11 that constitutes a valve chamber 111 and a valve port 112, and a valve body 12 that changes the opening degree of the valve port 112. In this valve device 10, the first joint 131 is connected to the valve body 11 from the radial direction D11, and the second joint 132 is connected from the axial direction D12 along the axis L11.

The valve body 11 is a member formed by cutting a metal rod formed by stretching a metal block such as stainless steel or brass, and is formed in an overall cylindrical shape centered on the axis L11 and extending in the axial direction D12, An internal space that constitutes a valve chamber 111 is provided. A cylindrical valve port 112 that opens into the valve chamber 111 and a second joint portion 114 for joining a cylindrical second joint 132 are provided on one end side of the valve body 11 in the axial direction D12. ing. Further, a first joint portion 113 for joining a circular tubular first joint 131 is provided on a side surface of the valve body 11 in the radial direction D11. In this embodiment, the inner diameter of the cylindrical valve chamber 111 is larger than the inner diameter of the cylindrical 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 the flow rate is adjusted by the valve body 12 that changes the opening degree of the valve port 112. .

The valve body 12 is a round bar member with a tapered tip, and is configured to enter the inside of the valve chamber 111 from the end opposite to the valve port 112 in the axial direction D12. . The opening degree of the valve port 112 is changed by moving the valve body 12 in the axial direction D12 so that the tip approaches or moves away from the valve port 112.

A valve guide member 141 is attached to the valve body 11 by press fitting and caulking so as to be inserted into the valve chamber 111 from the end opposite to the valve port 112. The valve body 12 passes through a guide hole at the center of the valve guide member 141 and enters the valve chamber 111 so that its distal end can move in the axial direction D12. The end of the valve body 12 opposite to the valve port 112 is connected via a valve holder 142 to a rotor shaft 162 of a stepping motor 16 for driving the valve body.

Further, a lower end opening of a vertically elongated cap-shaped lid member 18 is joined to the other end side of the valve body 11 in the axial direction D12, which is the side opposite to the valve port 112, so as to surround the outer circumferential side of the valve guide member 141. A lid joint 115 is provided for this purpose. The lid member 18 includes a cylindrical case 181 on the lower opening side, and a can 182 that covers the upper part and is airtightly fixed by welding or the like, and accommodates the rotor shaft 162 and the magnet rotor 161 of the stepping motor 16. There is.

A support member 143 that supports the valve holder 142 so as to be movable in the axial direction D12 is attached to the inner edge of the opening of the case 181 on the can 182 side. This support member 143 is attached to the inner edge of the opening of the case 181 at the intermediate portion in the axial direction D12, and a guide space is formed on the valve body 11 side to accommodate the valve holder 142 and guide it in the axial direction D12. Further, on the opposite side, a female threaded portion is formed into which the male threaded portion of the rotor shaft 162 of the stepping motor 16 is screwed. The rotor shaft 162 enters the guide space of the valve holder 142 in the support member 143 with the male threaded part screwed into the female threaded part, and its tip is connected to the end of the valve body 12 via the valve holder 142. There is.

In addition to the rotor shaft 162, the stepping motor 16 includes a magnet rotor 161 fixed to the rotor shaft 162, and a stator coil 163 disposed outside the can 182 so as to correspond to the magnet rotor 161. By applying a pulse signal to the stator coil 163, the magnet rotor 161 is rotated according to the number of pulses, and the rotor shaft 162 is rotated. Then, the rotor shaft 162 moves forward and backward in the axial direction D12 by the screw feeding mechanism constituted by the male threaded portion of the rotor shaft 162 and the female threaded portion of the support member 143, and the valve body 12 connected by the valve holder 142 moves toward the rotor shaft. Advance and retreat with 162. As a result, the distance between the tip of the valve body 12 and the valve port 112 changes, and the opening degree of the valve port 112 changes.

Further, the end of the rotor shaft 162 opposite to the valve body 12 is inserted and supported inside a cylindrical rotor guide 171 that hangs down from the end surface of the inner surface of the can 182 in the axial direction D12. Furthermore, a rotation stopper mechanism 172 for the magnet rotor 161 is provided on the outer periphery of the rotor guide 171. This rotation stopper mechanism 172 defines the upper and lower limits of movement of the rotor shaft 162, that is, the valve body 12, in the axial direction D12.

With the above configuration, when the stepping motor 16 is driven, the magnet rotor 161 and the rotor shaft 162 rotate, and the rotor shaft 162 moves forward and backward in the axial direction D12 by the screw feeding mechanism. As the rotor shaft 162 moves back and forth with this rotation, the valve body 12 moves back and forth in the axial direction D12 together with the valve holder 142. The valve body 12 changes the opening area of the valve port 112, that is, the degree of opening, by moving its tip forward and backward in the axial direction D12. Then, 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 according to the opening degree of the valve port 112.

Here, in this embodiment, the internal space constituting the valve chamber 111 of the valve body 11 and the second joint 114 for joining the second joint 132 on the valve port 112 side in the axial direction D12 are as follows. They have a similar relationship.

FIG. 2 is an enlarged view of the internal space constituting the valve chamber shown in FIG. 1 and the second joint for joining the second joint. FIG. 2 shows an enlarged view of the valve body 11 and its surroundings, and an enlarged view of an axial cross section taken along the line V11-V11. Further, FIG. 3 is an enlarged view of each of the first area A11, second area A12, and third area A13 in FIG. 2. FIG. 3(A) shows an enlarged view of the first area A11, FIG. 3(B) shows an enlarged view of the second area A12, and FIG. 3(C) shows an enlarged view of the third area A13. ing.

In the present embodiment, the valve chamber 111 of the valve body 11 includes a hollow portion connecting between the valve port 112 and the first joint 131 leading to the second joint 132, and a lid joint portion 115 into which the valve guide member 141 is press-fitted. The inner space 116 includes a cylindrical portion extending into the interior of the member 18. A second internally exposed portion 113a (described later), which is the outermost exposed portion 116b of the internally exposed portion 116a exposed to the internal space 116, is the outermost joint portion of the second joint 114 to which the second joint 132 is joined. 114a and is positioned overlapping with each other when viewed in the axial direction D12.

Here, in this embodiment, the outermost exposed portion 116b of the internal exposed portion 116a is located at three locations: a first internal exposed portion 111a, a second internal exposed portion 113a, and a third internal exposed portion 115b, which will be described below. Defined based on the exposed boundary of These exposed portion boundaries overlap the outermost joint edge 114a of the second joint portion 114 in the radial direction D11 when viewed in the axial direction D12, or are located inside the outermost joint edge 114a in the radial direction D11. It is configured as follows. First, as shown in FIG. 2, the first internally exposed portion 111a is a cylindrical inner wall surface of the valve chamber 111 that defines a hollow portion connecting the valve port 112 and the first joint 131 in the internally exposed portion 116a. This is the part located furthest outside in the radial direction D11. In the present embodiment, the first internally exposed portion 111a is located on the inner side of the outermost joint portion 114a in the radial direction D11.

As shown in FIG. 3(C), the second internally exposed portion 113a is the most diametrical portion of the portion along the inner peripheral edge of the first joint 131 in the first joint portion 113 to which the first joint 131 is joined. This is a portion located outside in direction D11. The first joint portion 113 is configured with a large diameter cylindrical through hole 113b and a small diameter cylindrical through hole 113c so as to 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. Further, the small diameter cylindrical through hole 113c is a through hole that communicates with the large diameter cylindrical through hole 113b and reaches the valve chamber 111, and has a diameter reduced by the thickness of the first joint 131 along the inner circumference of the first joint 131. . Further, the end of the first joint 131 on the valve chamber 111 side is positioned at the step between the large diameter cylindrical through hole 113b and the small diameter cylindrical through hole 113c. The first joint 131 is fitted into the large diameter cylindrical through hole 113b and brazed. Further, it is preferable that the outer peripheral edge of the small diameter cylindrical through hole 113c on the side of the first joint 131 is chamfered so as to substantially match the inner peripheral edge of the first joint 131. The second internal exposed portion 113a is the outermost portion in the radial direction D11 of the portions that contact the inner peripheral edge of the first joint 131 on the inner peripheral surface including the step portion of the large diameter cylindrical through hole 113b and the small diameter cylindrical through hole 113c. It is the part of In this embodiment, as described above, the second internally exposed portion 113a is positioned to overlap the outermost edge 114a of the joint portion when viewed in the axial direction D12.

As shown in FIG. 3(A), the third internally exposed portion 115b is located at the outer peripheral edge 115a of the lid joint portion 115, which is opposite to the inner peripheral edge 181a of the case 181 of the lid member 18. A circular joint opening is opened at the end of the case 181 on the valve body 11 side in the axial direction D12. On the other hand, as shown in FIGS. 2 and 3(A), the lid joint 115 includes an annular protrusion 115c that protrudes in an annular shape centered on the axis L11. The lid member 18 is fitted and joined to the annular protrusion 115c so that the open end of the annular protrusion 115c enters the inside of the joint opening. The joining is performed by caulking the open end of the annular protrusion 115c to enlarge its diameter, and then brazing with the brazing material 11a. Although the outer peripheral edge 115a of the annular protrusion 115c is covered with the brazing material 11a and is not exposed, the enlarged diameter portion formed by caulking on the open end side of the annular protrusion 115c is connected to the inside of the case 181 and the valve body. It is exposed to the internal space 116 as a boundary with the internal space 116 of No. 11. In the enlarged diameter portion of the annular protrusion 115c, the portion on the extension of the outer peripheral edge 115a is the portion located on the outermost side in the radial direction D11 among the portions of the lid joint portion 115 exposed to the internal space 116. , this portion serves as the third internally exposed portion 115b described above. In this embodiment, the third internally exposed portion 115b is located on the inner side of the outermost joint portion 114a in the radial direction D11. In addition, the case 181, the first joint 131, and the second joint 132 are formed by press molding from a thin plate, and are different from the metal rod that is the material of the valve body 11. There is no possibility of fluid leaking outside.

In this embodiment, as shown in FIG. The second internal exposed portion 113a is the outermost exposed portion 116b located at the outermost side. This outermost exposed portion 116b is connected to the outermost joint part edge 114a of the second joint part 114 to which the second joint 132 is joined, in the axial direction D12, as shown in FIGS. 2 and 3(C). They are located overlapping each other.

Here, in this embodiment, as shown in FIGS. 2 and 3B, an annular fitting groove 117 into which the end of the second joint 132 is fitted is formed at the shaft end of the valve body 11. has been done. A chamfered portion 114c is formed at the outer edge of this fitting groove 117 by C chamfering. When the end of the second joint 132 is fitted into the fitting groove 114b, it is partitioned by the outer peripheral surface of the second joint 132 and the chamfered part 114c, and is attached to the shaft end of the valve body 11 in an annular shape centered on the axis L11. , a joining recess 114b is formed in the shape of a triangular groove in cross section in the radial direction D11. When the joining recess 114b is filled with the molten brazing filler metal 11a, the brazing filler metal 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 joining recess 114b. The second joint 132 is connected to the valve body 11 by solidifying the brazing filler metal 11a that has flowed in this manner. The second joint portion 114 in this embodiment has a joint recess 114b at its outer edge, in which the chamfered portion 114c is formed as described above. The joining recess 114b is filled with the brazing material 11a so as to cover the outer edge of the chamfered portion 114c with the brazing material 11a. The outer edge of the chamfered portion 114c of the joining recess 114b constitutes the outermost joining part edge 114a of the second joining part 114, which is the outermost part in the radial direction D12.

The valve device 10 of the present embodiment is configured as described above, and with this configuration, the effects described below can be obtained. However, before explaining this effect, a comparison with the valve device 10 of the present embodiment will be made. Examples and problems in comparative examples will be explained.

FIG. 4 is a longitudinal sectional view of a valve device of a first comparative example with respect to the valve devices shown in FIGS. 1 to 3, and an axial sectional view taken along the line V21-V21. Further, FIG. 5 is a longitudinal cross-sectional view of a valve device of a second comparative example with respect to the valve devices shown in FIGS. 1 to 3, and an axial cross-sectional view taken along the line V31-V31. In addition, in these FIGS. 4 and 5, the same reference numerals are attached to the common components between the two.

In both the valve device 20 of the first comparative example shown in FIG. 4 and the valve device 30 of the second comparative example shown in FIG. The rotor shaft 262 of the stepping motor 26 is connected to the rotor shaft 262 of the stepping motor 26 on the inside thereof. In addition, in these comparative examples, the second joint 214 to which the second joint 232 is joined is a cylindrical stepped recess that communicates with the valve port 212, and the second joint 232 is connected to the second joint 214. The ends are fitted and brazed together.

However, points of comparison with the valve device 10 shown in FIGS. 1 to 3 are that the first comparative example and the second comparative example have a common valve body 22, a stepping motor 26, and a second joint 214. It is not the structure of The points of comparison here are the outermost exposed portions 216b, 316b in the internal spaces 216, 316 constituting the valve chambers 211, 311 of the valve bodies 21, 31, and the most diameter of the second joint portion 214, which is common to both comparative examples. It has a positional relationship with the outermost joint portion edge 214a on the outside in direction D21.

First, in the valve device 20 of the first comparative example shown in FIG. It is a horizontal hole opened in the cylindrical valve body 21. Of the internally exposed portions 216a of the internal space 216 constituting this valve chamber 211, the outermost exposed portion 216b located at the outermost side in the radial direction D21 is located at the outermost side in the radial direction D21 on the inner wall surface of the valve chamber 211. The first internally exposed portion 211a is located at the first internally exposed portion 211a. In the valve device 20 of the first comparative example, the first inner exposed portion 211a, which is the outermost exposed portion 216b, is further away in the radial direction D21 than the circular outermost edge 214a of the second joint portion 214 in the longitudinal cross-sectional view. However, in the axial cross-sectional view, it is located outside the circular outermost edge 214a of the second joint 214 when viewed in the axial direction D22. As a result, as shown by mesh hatching in FIG. 4, the two corners of the rectangular valve chamber 211 opposite to the first joint 213 when viewed in the axial direction D22 are , protrudes to the outside of the outermost edge 214a of the circular joint portion.

Next, in the valve device 30 of the second comparative example shown in FIG. It is formed into a circular cylindrical shape by drilling etc. On the other hand, in the valve device 30 of this second comparative example, the cylindrical first joint part 313 to which the first joint 331 is joined is larger than the first joint part 213 of the first comparative example shown in FIG. It is formed in a shallow cylindrical shape on the valve chamber 311 side. As a result, in the valve device 30 of the second comparative example, the second internally exposed portion 313a located furthest outside in the radial direction D21 among the portions of the first joint portion 313 along the inner peripheral edge of the first joint 331 is This is the outermost exposed portion 316b among the exposed portions 316a. In the valve device 30 of the second comparative example, the second inner exposed portion 313a, which is the outermost exposed portion 316b, is further away in the radial direction D21 than the circular outermost edge 214a of the second joint portion 214 in the longitudinal cross-sectional view. However, in the axial cross-sectional view, it is located outside the circular outermost edge 214a of the second joint 214 when viewed in the axial direction D22. As a result, as shown by mesh hatching in FIG. 5, two wedge-shaped portions are formed between the rectangular first joint portion 313 and the circular joint portion outermost edge 214a when viewed in the axial direction D22. , which protrudes to the outside of the outermost edge 214a of the joint portion. In other words, if you look not only at the longitudinal cross-sectional view but also at the axial cross-sectional view, the outermost exposed portion will either overlap the outermost edge of the joint of the second joint in the axial direction, or be radially smaller than the outermost edge of the joint. It is difficult to judge whether it is located inside the direction.

Here, in both the first comparative example and the second comparative example, the valve bodies 21 and 31 are made of stainless steel, brass, etc., similar to the valve body 11 in the valve device 10 shown in FIGS. 1 to 3. It is a member formed by cutting a metal rod that is formed by stretching a metal lump. At this time, when the valve bodies 21 and 31 are molded, the metal lump that is the raw material may contain fine air bubbles. When such a metal lump is stretched to form a metal rod, air bubbles are also stretched together, and a continuous communication path may be formed in the axial direction D22.

As described above, in both the first comparative example and the second comparative example, the second joint is attached to the internally exposed portions 216a, 316a of the internal spaces 216, 316 constituting the valve chambers 211, 311 when viewed in the axial direction D22. There is a portion of the portion 214 that protrudes outward from the outermost edge 214a of the joint portion. If the above-mentioned communication path in the axial direction D22 is formed in such a protruding portion, the internal spaces 216, 316 of the valve bodies 21, 31 and the external space will be communicated with each other, and fluid may leak to the outside. There is sex. As described above, both the valve device 20 of the first comparative example shown in FIG. 4 and the valve device 30 of the second comparative example shown in FIG. 5 have the problem of the possibility of fluid leakage. exist.

In the valve device 10 of the embodiment shown in FIGS. 1 to 3, the first joint 113 and the second joint 114 are joined to the valve body 11 by the brazing material 11a, and the first joint 131 and the second joint 132 are joined to the valve body 11. has been done. At this time, in contrast to the above-mentioned comparative example, the second internally exposed portion 113a, which is the outermost exposed portion 116b of the internal space 116 of the valve body 11 shown in FIG. It is positioned so as to overlap the outermost edge 114a when viewed in the axial direction D12. Further, the first internally exposed portion 111a and the third internally exposed portion 115b are located inside the outermost joint portion edge 114a in the radial direction D11. According to this embodiment, even if the communication path in the axial direction D12 as described above exists, this outermost exposed portion 116b (second internal exposed portion 113a) is connected to the second joint when viewed in the axial direction D12. It is positioned overlapping the outermost edge 114a of the joint portion 114 of the portion 114. As a result, each part of the internal exposed portion 116a overlaps with or is located inside the outermost edge 114a of the joint portion when viewed from the axial direction D12, and the end portion of the communication path in the axial direction D12 is located at the brazing material 11a or It is either blocked by the end 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 and the external space are not communicated with each other, and leakage of fluid (external leakage) can be suppressed.

Here, in this embodiment, the second joint portion 114 is constituted by an annular groove-shaped joint recess 114b, and the joint recess 114b is filled with the brazing material 11a. According to this configuration, the joining recess 114b becomes a solder reservoir, and the end of the communication path in the axial direction D12 as described above is effectively blocked by the brazing material 11a filled therein, so that fluid leakage does not occur. leakage (external leakage) can be effectively suppressed.

Further, in this embodiment, a chamfered portion 114c is formed at the outer edge of the joint recess 114b, and the outer edge of the chamfered portion 114c constitutes the outermost edge 114a of the joint. According to this configuration, the brazing material 11a can be extended to the outer edge of the chamfered portion 114c due to its wettability, for example. As a result, in the second joint portion 114, the range in which the end of the communication path in the axial direction D12 can be closed can be expanded to the outside in the radial direction D11, so that fluid leakage (external leakage) can be more effectively prevented. Can be suppressed.

Further, in this embodiment, the outermost exposed portion 116b is connected to the first internal exposed portion 111a related to the inner wall surface of the valve chamber 111, the second internal exposed portion 113a related to the first joint portion 113, and the lid joint portion 115. The third internal exposed part 115b is defined by the second internal exposed part 113a among the three exposed part boundaries. According to this configuration, the outermost exposed portion 116b of the valve body 11 is defined based on the shape of each part that can be assumed as the structure of the valve device 10, and the shape of the first joint portion 113 among them. ing. Under such an assumption, the outermost exposed portion 116b is configured to overlap the outermost joint edge 114a when viewed in the axial direction D12, so that fluid leakage (external leakage) can be more effectively prevented. Can be suppressed.

Further, in this 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 configuration, the lid member 18 is joined to the valve body 11 in a well-balanced manner centering on the axis L11 by fitting with the annular protrusion 115c, so that the axis of the valve body inside the valve body 11 is The operation in the direction D12 can be stabilized.

Further, in this embodiment, the inner diameter of the valve chamber 111 is formed larger than the inner diameter of the first joint 131. According to this configuration, fluid can flow while suppressing pressure loss within the valve chamber 111.

Next, a modification of the valve device 10 shown in FIGS. 1 to 3 will be described.

FIG. 6 is a longitudinal cross-sectional view of a modified valve device with respect to the valve device 10 shown in FIGS. 1 to 3, and an axial cross-sectional view taken along the line V41-V41. Note that the valve device 40 shown in FIG. 6 is also a modification of the valve device 30 of the second comparative example shown in FIG. Therefore, in FIG. 6, components that are equivalent to those shown in FIG. 5 are given the same reference numerals as in FIG. 5, and redundant explanation of these equivalent components will be omitted below.

The valve device 40 of this modification is a device in which the opening degree of the valve port 212 is changed by the cylindrical valve body 22 connected inside to the rotor shaft 262 of the stepping motor 26. In the valve device 40 of this modification, the cylindrical first joint 413 to which the first joint 431 is joined is closer to the valve chamber 411 than the first joint 313 of the second comparative example shown in FIG. It is formed into a deep cylindrical shape. Specifically, in the valve device 40 of the modified example, the second inner exposed portion 413a, which is the outermost part in the radial direction D21 in the first joint part 413, overlaps the outermost circular joint part edge 214a in the second joint part 214. A first joint portion 413 is formed. As a result, in the valve device 40 of the modified example, among the internally exposed parts 416a of the internal space 416 of the valve body 41, the outermost exposed part 416b located at the outermost side in the radial direction D21 is the second internally exposed part 413a. , when viewed in the axial direction D22, is located overlapping with the outermost circular joint part edge 214a of the second joint part 214.

Also in the valve device 40 of the modification described above, the outermost exposed portion 416b of the valve body 41 is positioned overlapping the outermost joint portion 214a of the second joint portion 214 when viewed in the axial direction D22. As a result, even if the above-described communication path in the axial direction D12 exists, the internal space 416 of the valve body 41 and the external space are not communicated with each other, thereby suppressing fluid leakage (external leakage). This feature is similar to the valve device 10 of the embodiment shown in FIGS. 1 to 3.

Note that the embodiments and modifications described above merely show typical forms 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 invention. Of course, such modifications fall within the scope of the present invention as long as they still have the configuration of the valve device of the present invention.

For example, in the description of the above-mentioned embodiments and modifications, application of the valve devices 10, 40 is not specified, but these valve devices 10, 40 are applicable to electric valves, mechanical expansion valves, manual on-off valves, and It can be applied to the body parts of various valves such as electromagnetic valves.

In addition, in the above-described embodiments and modifications, as an example of the outermost exposed portion, the outermost exposed portion 116b overlaps the outermost joint edges 114a and 214a of the second joint portions 114 and 214 when viewed in the axial direction D12. , 416b are illustrated. However, the outermost exposed portion is not limited to this, and may be located inside the outermost edge of the joint portion in the radial direction D11.

In addition, in the above-described embodiments and modifications, the outermost exposed portions 116b and 416b defined by the second inner exposed portions 113a and 413a of the first joint portions 113 and 413 are exemplified as examples of the outermost exposed portions. has been done. However, the outermost exposed part is not limited to this, and may be, for example, the first internally exposed part in the valve chamber, the third internally exposed part in the lid joint, etc. As long as it is the most radially outermost portion of the exposed portion, its specific form is not critical.

Further, in the above-described description of the embodiment and the modified examples, the brazing material 11a is exemplified as an example of the bonding material in the first joint portion and the second joint portion. However, the bonding material is not limited to this, and may be a molten material or the like in a bonding method such as welding or welding.

Furthermore, in the description of the present embodiment, as an example of the second joint part, the second joint part 114 is exemplified, which is constituted by an annular groove-shaped joint recess 114b and is filled with the brazing material 11a. Furthermore, in this example, a chamfered portion 114c is formed at the outer edge of the joint recess 114b, and the outermost edge 114a of the joint portion is formed by the outer edge of the chamfered portion 114c. However, the second joint part is not limited to this, and, for example, like the second joint part 114 of the modified example shown in FIG. It may also be something that However, according to the second joint part 114, which is composed of an annular groove-shaped joint recess 114b and filled with the brazing material 11a, leakage of fluid (external leakage) is effectively prevented by the brazing material 11a filled therein. The points that can be suppressed are as described above. Furthermore, by providing a chamfered portion 114c on the outer edge of the joint recess 114b, the range that can be closed by the brazing material 11a is expanded to the outside in the radial direction D11, and fluid leakage (external leakage) can be suppressed more effectively. The ability to do this is also as mentioned above. In the description of the present embodiment and modifications, as an example of an annular groove-shaped joint recess, a joint recess 114b whose outer circumferential side is partitioned by a chamfered portion 114c with a C chamfer and whose cross section in the radial direction D11 is triangular is used. is exemplified. However, the joint recess is not limited to a groove with a triangular cross section, and may be, for example, a stepped groove with a rectangular cross section, or a groove whose outer circumference is partitioned by a curved chamfered portion using R chamfering. It's okay.

In addition, in the description of the present embodiment and the modified example, any of the above-mentioned first internal exposed parts 111a, 411a, second internal exposed parts 113a, 413a, and third internal exposed parts 115b is used as an example of the outermost exposed part. The outermost exposed portions 116b and 416b defined in the above are illustrated. However, the outermost exposed part is not limited to this, and as described above, as long as it is the most radially outer part of the internal exposed parts exposed to the internal space of the valve body, the specific aspect thereof may be It is not a question of. However, by defining the outermost exposed portions 116b, 416b as any of the three internally exposed portions that can be assumed in the structure of the valve device as described above, fluid leakage (external leakage) can be more effectively suppressed. The points that can be performed are as described above.

In addition, in the description of the present embodiment and the modified example, the lid joint 115 having the annular protrusion 115c is illustrated as an example of the lid joint. However, the lid joint portion is not limited to this, and its specific form is not critical as long as the lid member can be joined. However, as described above, the lid joint portion 115 having the annular projection 115c can stabilize the operation of the valve body in the axial direction D12.

In addition, in the description of the present embodiment and the modified example, the valve chamber 111 whose inner diameter is larger than the inner diameter of the first joint 131 is illustrated as an example of the valve chamber. However, the valve chamber is not limited to this, and may have an inner diameter that is the same as or smaller than the inner diameter of the first joint. However, as described above, if the valve chamber 111 is formed to have an inner diameter larger than the inner diameter of the first joint 131, fluid can flow while suppressing pressure loss within the valve chamber 111.

Although the embodiments of the present invention have been described above in detail with reference to the drawings, the specific configuration is not limited to these embodiments, and the design may be changed without departing from the gist of the present invention. Even if there is, it is included in the present invention.

10, 40 Valve device 11, 41 Valve body 11a Brazing material 12, 22 Valve body 18 Lid member 111, 411 Valve chamber 111a, 211a, 411a First internal exposed part 113a, 313a, 413a Second internal exposed part 115 Lid joint part 115a Outer peripheral edge 115b Third internally exposed portion 116,416 Internal space 116a,416a Internally 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

Claims (6)

The valve body includes a valve body that configures a valve chamber and a valve port, and a valve body that changes the opening degree of the valve port, a first joint is connected to the valve body from a radial direction, and a second joint is connected from an axial direction to the valve body. A valve device to which is connected,
The valve main body is formed in an overall cylindrical shape extending in the axial direction, and is provided with an internal space constituting the valve chamber, and has the valve port and the third a second joint portion for joining the two joints; a first joint portion for joining the first joint is provided on the radial side surface of the valve body;
Of the internal exposed parts exposed to the internal space of the valve body, the outermost exposed part located on the outermost side in the radial direction is the outermost edge of the joint part on the outermost side in the radial direction of the second joint part, and A valve device characterized in that the valve devices overlap when viewed in the axial direction or are located inside the outermost edge of the joint portion in the radial direction. The outer edge of the second joint portion is configured with a joint recess formed in an annular groove shape centered on the axis, and the joint recess is filled with a brazing material as a joining material. The valve device according to claim 1. 3. The valve device according to claim 2, wherein a chamfer is formed in the joint recess, and an outer edge of the chamfer forms the outermost edge of the joint. The valve body has a lid joint portion for joining a lid member on the other end side in the axial direction,
The outermost exposed portion of the valve body is
a first internally exposed portion located at the outermost side in the radial direction on the inner wall surface of the valve chamber;
a second internally exposed portion located furthest in the radial direction among the portions along the inner peripheral edge of the first joint in the first joint;
a third internally exposed portion located at an outer peripheral edge of the lid member opposite to an inner peripheral edge of the lid joint;
The valve device according to any one of claims 1 to 3, characterized in that the valve device is defined by any one of the following. 5. The lid joint according to claim 4, wherein the lid joint has an annular projection that projects in an annular shape centered on an axis, and the lid member is fitted and joined to the annular projection. The valve device described. 6. The valve device according to claim 1, wherein the inner diameter of the valve chamber is larger than the inner diameter of the first joint.

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