JP5943427B2 - Manufacturing method of valve device - Google Patents

Description

The present invention relates to a method for manufacturing a valve device including a valve housing and a piping member joined thereto.

  Conventionally, as a valve device, for example, there is an electric valve disclosed in Patent Document 1. As shown in FIG. 20, a motor-operated valve 801 disclosed in Patent Document 1 has a valve housing 811 made of stainless steel in which a valve chamber 810A is formed inside, and a valve seat member 812 arranged in the valve chamber 810A. A main body 810, a copper first joint 817 and a second joint 818 as piping members joined to the valve housing 811, a valve body portion 820 including a valve body 822 accommodated in the valve chamber 810A, and a valve body A stepping motor 830 that moves the portion 820 forward and backward with respect to the valve seat member 812.

  In the electric valve 801, the valve housing 811 is made of stainless steel, the first joint 817 and the second joint 818 are made of copper, the valve housing 811 and the first joint 817 are joined, and the valve Brazing was used to join the housing 811, the second joint 818, and the valve seat member 812.

JP 2007-2111814 A

  However, for example, in joining by furnace brazing, since it takes time to increase the temperature, the entire member to be brazed is heated to a high temperature. For this reason, for example, the first joint 817 and the second joint 818 are blunted due to the overall heating, so that the first joint 817 and the second joint 818 are easily deformed during handling. There was a risk that the dimensions of the joint 817, the second joint 818, and the valve seat member 812 would change. In particular, when the dimensional change of the valve seat member 812 occurs, the sealing performance between the valve seat member 812 and the valve body 822 may be deteriorated. On the other hand, in the case of joining by welding, only the joining portion and the vicinity thereof are heated, so it is possible to avoid dullness or dimensional change of each member. However, since stainless steel and copper are poorly weldable and do not mix with each other by welding (copper may solidify in a molten stainless steel), the valve housing 811 and the first joint 817 are welded together. When the valve housing 811, the second joint 818, and the valve seat member 812 are joined using welding, it is difficult to ensure welding strength or the like due to poor welding such as internal cracks. Met. Thus, in joining a stainless steel member and a copper member, there is a problem that there is room for improvement.

The present invention aims to provide a method for producing a BenSo location where bonding strength of the joint can be effectively ensured by welding of the stainless steel member and the copper member.

In order to solve the above-described problem, the reference invention 1 is a valve device including a stainless steel valve housing having a valve chamber provided therein, and a copper piping member joined to the valve housing. Between the housing and the piping member, there is provided a welded portion formed by melting and solidifying each of stainless steel, copper, and a metal mixed by welding with laser welding, and the valve housing and the piping member. Is a valve device characterized by being joined to each other through the welded portion.

In order to solve the above-described problem, the reference invention 2 is a stainless steel valve housing having a valve chamber provided therein, a copper piping member joined to the valve housing, and a stainless steel joint joined to the valve housing. In the valve device comprising the valve seat member, the valve seat member and one end portion of the piping member are formed in the communication hole in the communication hole that communicates the inside and the outside of the valve housing formed in the valve housing. Stainless steel, copper, and metal mixed together by welding are melted and solidified by laser welding between the valve housing, the piping member, and the valve seat member. The valve device is characterized in that the welded portion is provided, and the valve housing, the piping member, and the valve seat member are joined to each other via the welded portion.

In order to solve the above problems, the reference invention 3 is a stainless steel valve housing having a valve chamber provided therein, and a stainless steel valve seat that is attached to the valve housing and defines the valve chamber together with the valve housing. In a valve device comprising a member and a copper piping member joined to the valve seat member, stainless steel, copper, and a metal mixed by welding between the valve seat member and the piping member Each of which is welded and formed by melting and solidifying by laser welding, and the valve seat member and the piping member are joined to each other via the welded portion. is there.

In order to solve the above-mentioned problem, the reference invention 4 is a valve device comprising a copper valve housing and a stainless steel valve seat member joined to the inside of the valve housing, wherein the valve housing and the valve seat Between the members, there is provided a welded portion formed by melting and solidifying each of stainless steel, copper, and a metal mixed by welding with laser welding, the valve housing and the valve seat member, The valve device is joined to each other through the weld.

In order to solve the above-mentioned problem, the reference invention 5 is a valve device including a stainless steel member and a copper member. Between the stainless steel member and the copper member, stainless steel, copper and Each of these and a metal mixed by welding is melted and solidified by laser welding to provide a welded portion, and the stainless steel member and the copper member are joined to each other via the welded portion. The valve device is characterized by that.

Reference invention 6 is the invention according to any one of reference inventions 1 to 5, wherein the metal mixed by welding with the stainless steel and copper is mainly one metal selected from nickel, lithium, bismuth, gold and platinum. It is characterized by being included as a component or one brazing material selected from phosphor copper brazing, silver brazing and nickel brazing.

In order to solve the above-mentioned problem, the reference invention 7 is a method of manufacturing a valve device including a stainless steel valve housing having a valve chamber provided therein and a copper piping member joined to the valve housing. The pipe member is inserted into a communication hole communicating with the inside and outside of the valve housing formed in the valve housing, and is made of a metal mixed by welding with stainless steel and copper between the valve housing and the pipe member. A metal material is sandwiched between the valve housing and the piping member so that a welded portion formed by solidification of stainless steel, copper and the metal after melting is formed in the circumferential direction of the communication hole. It is a manufacturing method of the valve apparatus characterized by including the welding process of performing laser welding along.

In order to solve the above-mentioned problems, the invention described in claim 1 includes a stainless steel valve housing having a valve chamber provided therein, a copper piping member joined to the valve housing, and the valve housing. A stainless steel valve seat member, wherein the valve seat member and the pipe are formed in a communication hole communicating with the inside and outside of the valve housing formed in the valve housing. A metal member made of metal mixed by welding with stainless steel and copper between the valve seat member and the piping member, and one end portion of the member arranged in the axial direction of the communication hole, and the valve housing Between the pipe member and the valve seat member so that a welded portion formed by solidification of stainless steel, copper and the metal after melting is formed along the circumferential direction of the communication hole. A method of manufacturing a valve device which comprises a welding step of performing Heather welding.

In order to solve the above problems, the reference invention 8 is a stainless steel valve housing having a valve chamber provided therein, and a stainless steel valve seat that is attached to the valve housing and defines the valve chamber together with the valve housing. A valve device manufacturing method comprising: a member; and a copper piping member joined to the valve seat member, wherein the piping is connected to a communication hole that communicates the inside and outside of the valve housing formed in the valve seat member Inserting a member and sandwiching a metal material made of a metal mixed by welding with stainless steel and copper between the valve seat member and the piping member, and between the valve seat member and the piping member, stainless steel, A valve including a welding step of performing laser welding along a circumferential direction of the communication hole so that a welded portion formed by solidifying copper and the metal after melting is formed. It is a method of manufacturing location.

In order to solve the above problems, the invention described in claim 2 is a method of manufacturing a valve device comprising a copper valve housing and a stainless steel valve seat member joined to the inside of the valve housing. A metal member made of a metal mixed with stainless steel and copper by welding is inserted between the valve housing and the valve seat member, and the valve housing is inserted into the valve housing. And a valve seat member including a welding step of performing laser welding so that a welded portion formed by solidification of each of stainless steel, copper, and the metal after melting is formed. Is the method.

Reference invention 9 is a method of manufacturing a valve device including a stainless steel member and a copper member in order to solve the above-described problem, and includes stainless steel and a copper member between the stainless steel member and the copper member. A metal material made of metal mixed by welding with copper is sandwiched, and a welded portion is formed between each of the stainless steel member and the copper member and solidified after melting of stainless steel, copper, and the metal. It is the manufacturing method of the valve apparatus characterized by including the welding process which performs laser welding as it is.

According to the reference invention 1 , between the stainless steel valve housing and the copper piping member, each of stainless steel, copper, and a metal mixed with these by welding is melted and solidified by laser welding. The valve housing and the piping member are joined to each other through the welded portion. Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a stainless steel valve housing and a copper piping member is effectively securable by the welding part formed by laser welding. That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member.

According to the reference invention 2 , the valve seat member and the one end portion of the piping member are sequentially arranged in the axial direction of the communication hole in the communication hole that communicates the inside and the outside of the valve housing formed in the valve housing, and is made of stainless steel. Between the valve housing, the copper piping member, and the stainless steel valve seat member, there are welded portions formed by melting and solidifying each of stainless steel, copper, and a metal mixed by welding with laser welding. The valve housing, the piping member, and the valve seat member are joined to each other through the welded portion. Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a stainless steel valve housing and a valve seat member, and a copper piping member is effectively securable by the welding part formed by laser welding. That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member. Further, since the valve housing, the piping member, and the valve seat member can be welded simultaneously, it is necessary to separately perform the process of welding the valve housing and the piping member and the process of welding the valve housing and the valve seat member. Therefore, manufacturing workability can be improved.

According to the reference invention 3 , between the stainless steel valve seat member and the copper piping member, each of stainless steel, copper, and a metal mixed with these by welding is melted and solidified by laser welding. A welded portion is provided, and the valve seat member and the piping member are joined to each other via the welded portion. Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a stainless steel valve seat member and a copper piping member is effectively securable by the welding part formed by laser welding. That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member .

According to the reference invention 4 , between the copper valve housing and the stainless steel valve seat member, each of stainless steel, copper, and a metal mixed with these by welding is melted and solidified by laser welding. A welded portion is provided, and the valve housing and the valve seat member are joined to each other via the welded portion. Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a copper valve housing and a stainless steel valve seat member is effectively securable by the welding part formed by laser welding.
That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member.

According to the reference invention 5 , between the stainless steel member and the copper member, there is a weld portion formed by melting and solidifying each of stainless steel, copper, and a metal mixed with these by laser welding. A stainless steel member and a copper member are joined to each other through the welded portion. Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a stainless steel member and a copper member is effectively securable by the welding part formed by laser welding.

According to the reference invention 6 , the metal that is mixed with the stainless steel and copper by welding contains one metal selected from nickel, lithium, bismuth, gold and platinum as a main component, or a phosphor copper braze, One brazing material selected from silver brazing and nickel brazing. Therefore, compared to the configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed with each other by interposing a metal mixed with stainless steel and copper, so that stainless steel and copper are separated without mixing. It is possible to suppress solidification in the state.

According to the reference invention 7 , the pipe member is inserted into the communication hole that communicates the inside and outside of the valve housing formed in the valve housing, and the stainless steel and copper are mixed between the valve housing and the pipe member by welding. A metal material is sandwiched between the stainless steel valve housing and the copper piping member so that a welded portion formed by solidification of the stainless steel, copper, and the metal after melting is formed. It includes a welding process in which laser welding is performed along the direction. Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a stainless steel valve housing and a copper piping member is effectively securable by the welding part formed by laser welding. That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member.

According to the first aspect of the present invention, the valve seat member and the one end portion of the piping member are arranged side by side in the axial direction of the communication hole in the communication hole communicating with the inside and the outside of the valve housing formed in the valve housing. In addition, a metal material made of metal mixed by welding with stainless steel and copper is sandwiched between the valve seat member and the piping member, and between the stainless steel valve housing, the copper piping member and the stainless steel valve seat member. In addition, a welding process is performed in which laser welding is performed along the circumferential direction of the communication hole so as to form a welded portion in which each of stainless steel, copper, and the metal is solidified after melting. Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a stainless steel valve housing and a valve seat member, and a copper piping member is effectively securable by the welding part formed by laser welding. That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member. Further, since the valve housing, the piping member, and the valve seat member can be welded simultaneously, it is necessary to separately perform the process of welding the valve housing and the piping member and the process of welding the valve housing and the valve seat member. Therefore, manufacturing workability can be improved.

According to the reference invention 8 , the pipe member is inserted into the communication hole that communicates the inside and the outside of the valve housing formed in the valve seat member, and the stainless steel and copper are mixed between the valve seat member and the pipe member by welding. And a communication hole is formed between the stainless steel valve seat member and the copper piping member so as to form a welded portion in which each of the stainless steel, copper, and the metal is solidified after melting. A welding step of performing laser welding along the circumferential direction of Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a stainless steel valve seat member and a copper piping member is effectively securable by the welding part formed by laser welding. That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member.

According to the invention described in claim 2 , the valve seat member is inserted inside the valve housing and a metal material made of metal mixed with stainless steel and copper by welding is sandwiched between the valve housing and the valve seat member, And the welding process which laser-welds so that the welding part formed by each of stainless steel, copper, and the said metal solidifying after a fusion | melting may be formed between a copper valve housing and a stainless steel valve seat member. Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a copper valve housing and a stainless steel valve seat member is effectively securable by the welding part formed by laser welding. That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member.

According to the reference invention 9 , between the stainless steel member and the copper member, a metal material made of a metal mixed by welding with stainless steel and copper is sandwiched, and between the stainless steel member and the copper member, It includes a welding process in which laser welding is performed so that a welded portion formed by solidification of stainless steel, copper, and the metal after melting is formed. Since stainless steel and copper are mixed with each other by interposing a metal that is mixed by welding with stainless steel and copper compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed together. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with a stainless steel member and a copper member is effectively securable by the welding part formed by laser welding.

It is a longitudinal cross-sectional view of the motor operated valve of the 1st Embodiment of this invention. (A) is a fragmentary sectional view which shows the state before welding of the valve housing with which the motor operated valve of FIG. 1 is equipped, and a 1st coupling and a 2nd coupling, (b) is a fragmentary sectional view which shows the state after welding. is there. It is a longitudinal cross-sectional view of the motor operated valve of the 2nd Embodiment of this invention. (A) is a fragmentary sectional view which shows the state before welding of the valve housing with which the motor operated valve of FIG. 3 is equipped, a 1st coupling, and a 2nd coupling, (b) is a fragmentary sectional view which shows the state after welding. is there. It is a longitudinal cross-sectional view of the motor operated valve of the 3rd Embodiment of this invention. (A) is a fragmentary sectional view which shows the state before welding of the valve housing with which the motor operated valve of FIG. 5 is equipped, a 1st coupling, and a 2nd coupling, (b) is a fragmentary sectional view which shows the state after welding. is there. It is a fragmentary longitudinal cross-sectional view of the throttle valve apparatus of the 4th Embodiment of this invention. It is a fragmentary longitudinal cross-section which shows the state before welding of the valve housing with which the throttle valve apparatus of FIG. 7 is equipped, a 1st coupling, and a 2nd coupling. It is a longitudinal cross-sectional view of the flow-path switching valve of the 5th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state before welding with the valve main body and valve seat member with which the flow-path switching valve of FIG. 9 is equipped, and a 1st coupling, a 2nd coupling, a 3rd coupling, and a 4th coupling. It is a longitudinal cross-sectional view of the check valve of the 6th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state before welding with the copper pipe and valve seat member with which the non-return valve of FIG. 11 is provided. It is a longitudinal cross-sectional view which shows the structure of the modification of the non-return valve of FIG. It is a longitudinal cross-sectional view which shows the state before welding with the copper pipe with which the non-return valve of FIG. 13 is provided, and a valve seat member. It is a longitudinal cross-sectional view of the pressure control valve of the 7th Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state before welding with the valve main body with which the pressure regulation valve of FIG. 15 is provided, a valve seat member, and a thrust bearing. It is a longitudinal cross-sectional view which shows the state after welding with the valve main body with which the pressure regulation valve of FIG. 15 is provided, a valve seat member, and a thrust bearing. It is a longitudinal cross-sectional view which shows the structure of the modification of the pressure regulating valve of FIG. 15, Comprising: It is a longitudinal cross-sectional view which shows the state before welding with the valve main body with which a pressure regulating valve is equipped, a valve seat member, and a thrust bearing. It is a longitudinal cross-sectional view which shows the structure of the modification of the pressure regulating valve of FIG. 15, Comprising: It is a longitudinal cross-sectional view which shows the state after welding with the valve main body with which a pressure regulating valve is equipped, a valve seat member, and a thrust bearing. It is a longitudinal cross-sectional view of the conventional valve apparatus (electric valve).

(First embodiment)
Hereinafter, a motor-operated valve according to a first embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a longitudinal sectional view of a motor-operated valve according to a first embodiment of the present invention. FIG. 2A is a partial cross-sectional view showing a state before welding of the valve housing, the first joint, and the second joint included in the motor-operated valve of FIG. 1, and FIG. 2B is a partial cross-section showing a state after welding. FIG. In addition, the concept of “upper and lower” in the following description corresponds to the upper and lower sides in FIG. 1 and indicates the relative positional relationship between the members, and does not indicate the absolute positional relationship.

  As shown in FIG. 1, the motor-operated valve 1 includes a valve body 10, a first joint 17, a second joint 18, a valve body part 20, a stepping motor 30, a first welding part 51, and a second welding. Part 52.

  The valve body 10 includes a valve housing 11, a valve seat member 12, and a valve support guide member 13.

  The valve housing 11 is a stainless steel member formed in a cup shape (bottom cylindrical shape) by, for example, press molding. A first communication hole 11 </ b> A that communicates the inside and the outside of the valve housing 11 is formed at a part of the peripheral wall 11 a of the valve housing 11. Further, a second communication hole 11 </ b> B that communicates the inside and the outside of the valve housing 11 is formed at the center of the bottom wall 11 b of the valve housing 11. The valve housing 11 is preferably made of austenitic stainless steel.

  The valve seat member 12 is a stainless steel member formed in an annular shape with a valve port 12a opened inside. The outer diameter of the valve seat member 12 is the same as or slightly smaller than the diameter of the second communication hole 11B. The valve seat member 12 is arranged at a position closer to the inside of the valve housing 11 in the second communication hole 11B of the valve housing 11 so that the valve port 12a and the second communication hole 11B communicate with each other, and is welded to the valve housing 11 by welding. It is joined. The valve seat member 12 is preferably made of austenitic stainless steel.

  The valve support guide member 13 is a substantially cylindrical member made of resin, and an annular stainless steel mounting bracket 14 is insert-molded so that an outer edge protrudes in a flange shape at a location near the center in the axial direction. Yes. The valve support guide member 13 is fixedly mounted on the upper opening edge 11c of the valve housing 11 by welding the outer edge of the mounting bracket 14 over the entire circumferential direction. Thereby, the valve support guide member 13 is disposed so as to close the upper opening of the valve housing 11.

  The valve support guide member 13 closes the upper opening of the valve housing 11 so as to cooperate with the valve housing 11 to define a cylindrical space-like valve chamber 10A. That is, the valve housing 11 is provided with a valve chamber 10A in which a valve body described later is accommodated.

  The valve support guide member 13 is formed with a guide hole 15 that opens toward the valve chamber 10 </ b> A, and a female screw hole 16 that is concentric with the guide hole 15 is formed in the upper part of the valve support guide member 13. ing. A male screw portion 32 formed on a rotor shaft 31 of a stepping motor 30 described later is screwed into the female screw hole 16.

  The first joint 17 is a copper pipe through which a fluid flows. In the present embodiment, the first joint 17 is made of pure copper. In this specification, “copper” includes copper alloy containing copper and other substances in addition to pure copper (purity 99.9% or more). Any copper alloy may be used as long as it contains more than 50% by weight of copper as a main component, but oxygen-free copper, tough pitch copper, phosphorous deoxidized copper, aluminum bronze, or the like is particularly preferable. The outer diameter of the first joint 17 is formed to be the same as or slightly smaller than the diameter of the first communication hole 11A. One end of the first joint 17 is inserted and fitted into the first communication hole 11A of the valve housing 11, and the outer peripheral surface of the one end is joined to the inner peripheral surface of the first communication hole 11A by welding.

  The second joint 18 is a copper pipe similar to the first joint 17. In the present embodiment, the second joint 18 is made of pure copper. The outer diameter of the second joint 18 is the same as or slightly smaller than the diameter of the second communication hole 11B. One end of the second joint 18 is inserted and fitted into the second communication hole 11B of the valve housing 11 so that the flange portion 18a abuts against the valve housing 11, and the outer peripheral surface of the one end is the second communication hole. It is joined to the inner peripheral surface of 11B by welding. The first joint 17 and the second joint 18 each correspond to an example of a piping member.

  A first welded portion 51 is provided at a welding location between the valve housing 11 and the first joint 17. The first welding portion 51 is formed by laser welding between stainless steel constituting the valve housing 11, copper constituting the first joint 17, and nickel (Ni) between the valve housing 11 and the first joint 17. It is a part that has been melted and mixed and then solidified. The valve housing 11 and the first joint 17 are joined to each other via the first welded portion 51.

  A second welded portion 52 is provided at a welding location of the valve housing 11, the valve seat member 12, and the second joint 18. The second weld 52 is formed between the valve housing 11 and the valve seat member 12, between the valve housing 11 and the second joint 18, and between the valve seat member 12 and the second joint 18. The stainless steel that constitutes the housing 11 and the valve seat member 12, the copper that constitutes the second joint 18, and the nickel are melted by laser welding, mixed, and then solidified. The valve housing 11, the valve seat member 12, and the second joint 18 are joined to each other through the second welded portion 52.

  Since the 1st welding part 51 and the 2nd welding part 52 are formed including the nickel which mixes with stainless steel and copper by welding in the welding location with stainless steel and copper, compared with the structure which welded stainless steel and copper directly. By interposing nickel, stainless steel and copper are mixed and the respective materials are well adapted to each other, so that poor welding can be suppressed, and therefore the bonding strength can be increased.

  The valve body 20 includes a cylindrical valve holder 21, a needle-shaped valve body 22 fixed to the lower end of the valve holder 21 in the figure, and an axial direction (up and down in FIG. 1). And a compression coil spring 24 disposed in a state where a predetermined load is applied between the valve body 22 and the spring receiver 23. The valve holder 21 is fitted in the guide hole 15 of the valve support guide member 13 so as to be slidable in the axial direction.

  The stepping motor 30 is coaxially fixed to the rotor shaft 31, a rotor shaft 31 having a male screw portion 32 screwed into the female screw hole 16 of the valve support guide member 13, a rotor case 33 fixedly attached to the valve housing 11, and the rotor shaft 31. The rotor 34 is attached to the rotor case 33 so as to be rotatable around the axis, and the stator coil unit 35 is fixedly attached to the outer periphery of the rotor case 33.

  The rotor shaft 31 is connected to the upper end portion of the valve body portion 20 (specifically, the upper end portion of the valve holder 21) with the lower end thereof being rotatable relative to the axis. The rotor shaft 31 moves in the axial direction by rotating by the screw action of the male screw portion 32 and the female screw hole 16, and the movement in the axial direction is transmitted to the valve holder 21 and the valve body 22. Thereby, the valve body 22 is moved forward and backward with respect to the valve seat member 12 in the valve chamber 10A, and the opening and closing of the valve port 12a or the opening degree adjustment is performed.

  The rotor 34 is multipolarized at the outer periphery, and is fixedly connected to the rotor shaft 31 by a boss 34A. The stator coil unit 35 is of a resin-sealed type, and is configured in a substantially annular shape having two upper and lower electromagnetic coil portions 36, magnetic pole teeth 37, lead wires 38, and the like. The stator coil unit 35 has a rotor case 33 inserted therein, and is fixedly attached to the rotor case 33 by a mounting bracket 45. A stopper mechanism 39 that limits the rotation of the rotor 34 is formed in the rotor case 33.

  Next, an example of the manufacturing method of the motor-operated valve 1 will be described with reference to FIGS. 2 (a) and 2 (b).

(1: Welding process)
As shown in FIG. 2A, one end of the first joint 17 is inserted into the first communication hole 11 </ b> A of the valve housing 11, and the inner peripheral surface of the first communication hole 11 </ b> A of the valve housing 11 and the first joint 17. A nickel (Ni) tube material 55 having a thickness of about 0.1 mm to 0.5 mm is press-fitted between the outer peripheral surface of the one end portion. Alternatively, after fitting the tube material 55 into the first communication hole 11 </ b> A first, one end of the first joint 17 may be press-fitted inside the tube material 55. That is, the first joint 17 is inserted into the first communication hole 11 </ b> A, and the tube material 55 is sandwiched between the valve housing 11 and the first joint 17.

  Next, the inner peripheral surface portion of the first communication hole 11A (that is, the valve housing 11), the tube member 55, and the first joint are formed over the entire circumference from the outside of the valve housing 11 along the circumferential direction of the first communication hole 11A. Irradiation is stopped after irradiating the laser L so that the outer peripheral surface portion 17 is melted simultaneously. As a result, as shown in FIG. 2B, the stainless steel constituting the inner peripheral surface portion (that is, the valve housing 11) of the first communication hole 11A, the nickel constituting the tube material 55, and the first joint 17 are constituted. The copper is melted and mixed and then solidified, and the first weld 51 is formed between the valve housing 11 and the first joint 17 over the entire circumference of the first communication hole 11A. The valve housing 11 and the first joint 17 are joined to each other by the first welding portion 51.

  2A, the valve seat member 12 and one end of the second joint 18 are inserted into the second communication hole 11B of the valve housing 11, and the inner periphery of the second communication hole 11B of the valve housing 11 is inserted. A nickel (Ni) tube material 56 having a thickness of about 0.1 mm to 0.5 mm is press-fitted between the surface and the outer peripheral surface of the valve seat member 12 and the outer peripheral surface of one end of the second joint 18. Alternatively, the valve member 12 and the second joint 18 may be press-fitted inside the tube material 56 after the tube material 56 is first fitted into the second communication hole 11B. That is, the valve seat member 12 and the second joint 18 are inserted into the second communication hole 11 </ b> B, and the tube material 56 is sandwiched between the valve housing 11, the valve seat member 12, and the second joint 18.

  Next, the inner peripheral surface portion of the second communication hole 11B (that is, the valve housing 11), the tube member 56, the valve seat member is formed over the entire circumference from the inside of the valve housing 11 along the circumferential direction of the second communication hole 11B. Irradiation is stopped after irradiating the laser L so that the outer peripheral surface portion of 12 and the outer peripheral surface portion of the second joint 18 melt simultaneously. As a result, as shown in FIG. 2B, the stainless steel constituting the inner peripheral surface portion (that is, the valve housing 11) of the second communication hole 11B, the nickel constituting the tube material 56, and the valve seat member 12 are constituted. The stainless steel and the copper constituting the second joint 18 are melted, mixed, and then solidified, and the entire circumference of the second communication hole 11B is provided between the valve housing 11, the valve seat member 12, and the second joint 18. A second weld 52 is formed. The valve housing 11, the valve seat member 12, and the second joint 18 are joined to each other by the second welded portion 52.

(2: Assembly process)
Next, the male screw portion 32 of the rotor shaft 31 is screwed into the female screw hole 16 of the valve support guide member 13, and the valve body portion 20 is attached to the lower end of the rotor shaft 31. The mounting bracket 14 of the valve support guide member 13 is fixedly attached to the upper opening edge 11c of the valve housing 11 by welding. After the rotor 34 is fixedly attached to the rotor shaft 31, the rotor case 33 in which the stopper mechanism 39 is assembled is installed in the upper portion of the valve support guide member 13, the rotor shaft 31 and the rotor 34. The rotor case 33 is fixedly attached to the upper opening edge 11c of the valve housing 11 by welding. Then, the rotor case 33 is inserted inside the stator coil unit 35, and the stator coil unit 35 is fixed and attached to the rotor case 33 by the mounting bracket 45. The motor-operated valve 1 is completed through the welding process and the assembly process.

  As described above, the motor-operated valve 1 according to the present embodiment includes the stainless steel valve housing 11 with the valve chamber 10 </ b> A provided therein, and the copper first joint 17 and the second joint 18 joined to the valve housing 11. And. The motor-operated valve 1 includes a first welded portion formed by melting and solidifying each of stainless steel, copper, and nickel by laser welding between the valve housing 11 and the first joint 17 and the second joint 18. 51 and the second welded portion 52 are provided, and the valve housing 11 and the first joint 17 and the second joint 18 are joined to each other via the first welded portion 51 and the second welded portion 52.

  In the motor-operated valve 1, the first joint 17 is inserted into the first communication hole 11 </ b> A communicating with the inside and the outside of the valve housing 11 formed in the valve housing 11, and the second joint 18 is inserted into the second communication hole 11 </ b> B. In addition, a tube material 55 and a tube material 56 made of nickel are sandwiched between the valve housing 11 and the first joint 17 and the second joint 18, and between the valve housing 11 and the first joint 17 and the second joint 18. Along the circumferential direction of the first communication hole 11A and the second communication hole 11B, a first welded part 51 and a second welded part 52 formed by solidifying each of stainless steel, copper and nickel after melting are formed. It is manufactured by a manufacturing method including a welding process for performing laser welding.

  As described above, according to the present embodiment, in the motor-operated valve 1, between the valve housing 11 and the first joint 17 and the second joint 18, each of stainless steel, copper, and nickel mixed with each other by welding is provided. A first weld 51 and a second weld 52 formed by being melted and solidified by laser welding are provided, and the valve housing 11, the first joint 17, and the second joint 18 are connected to the first weld 51 and the second weld. The parts 52 are joined together. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the first welded portion 51 and the second welded portion 52 formed by laser welding have an effect on the joint strength of the joint portion by welding between the stainless steel valve housing 11 and the copper first joint 17 and the second joint 18. Can be secured.

  In addition, the motor-operated valve 1 inserts the first joint 17 and the second joint 18 into the first communication hole 11A and the second communication hole 11B that communicate with the inside and the outside of the valve housing 11 formed in the valve housing 11, and the valve housing. 11 and the first joint 17 and the second joint 18 are sandwiched with a tube material 55 and a tube material 56 made of nickel mixed by welding with stainless steel and copper, and the valve housing 11, the first joint 17 and the second joint 18, the first communication hole 11 </ b> A and the second communication hole 11 </ b> B are formed so that the first welding part 51 and the second welding part 52 are formed by solidifying each of stainless steel, copper, and nickel after melting. It is manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the first welded portion 51 and the second welded portion 52 formed by laser welding have an effect on the joint strength of the joint portion by welding between the stainless steel valve housing 11 and the copper first joint 17 and the second joint 18. Can be secured.

(Second Embodiment)
Hereinafter, an electric valve according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4.

  FIG. 3 is a longitudinal sectional view of a motor-operated valve according to the second embodiment of the present invention. FIG. 4A is a partial cross-sectional view showing a state before welding of the valve housing, the first joint, and the second joint included in the electric valve of FIG. 3, and FIG. 4B is a partial cross-section showing a state after welding. FIG. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in FIG. 3 and indicates the relative positional relationship of each member, and does not indicate the absolute positional relationship.

  As shown in FIG. 3, the motor operated valve 1 </ b> A includes a valve body 10, a first joint 17, a second joint 18, a valve body part 20, a stepping motor 30, a first welding part 51, and a second welding. A part 52A and a direct welding part 53 are provided.

  The motor operated valve 1A shown in FIG. 3 is the motor operated valve 1 according to the first embodiment described above. (1) The valve housing 11 and the valve seat member 12 are formed by direct welding instead of the second welded portion 52. The valve housing 11 and the second joint 18 are joined instead of the second welded part 52 that joins the valve housing 11, the valve seat member 12, and the second joint 18 together. The second welded portion 52A for joining the two to each other, and the other configurations are the same. Therefore, in the following description, the same code | symbol is attached | subjected to the part same as the motor operated valve 1 of 1st Embodiment, and description is abbreviate | omitted.

  The valve seat member 12 is disposed at a location closer to the inside of the valve housing 11 in the second communication hole 11B of the valve housing 11 so that the valve port 12a and the second communication hole 11B communicate with each other. The valve seat member 12 is directly welded and joined to the valve housing 11 without using the tube material 56 or the like in the first embodiment. Specifically, the valve seat member 12 is joined to the valve housing 11 via a direct welding portion 53 made of stainless steel formed by welding with the valve housing 11. The direct welding portion 53 is formed so as to penetrate the valve housing from the outside of the valve housing 11 to the valve seat member 12. Moreover, the direct welding part 53 is cyclically | annularly arrange | positioned over the whole circumferential direction of the 2nd communicating hole 11B. Since both the valve seat member 12 and the valve housing 11 are made of stainless steel, the necessary joint strength can be ensured even if they are joined by direct welding.

  One end portion of the second joint 18 is inserted and fitted into the second communication hole 11B of the valve housing 11, and the upper portion of the flange portion 18a provided at the one end portion in the drawing is the outer peripheral edge portion of the second communication hole 11B. It is joined to 11d by welding.

  A second welded portion 52 </ b> A is provided at a welding location between the valve housing 11 and the second joint 18. In the second welded portion 52A, the stainless steel constituting the valve housing 11, the copper constituting the second joint 18, and nickel are respectively melted by laser welding between the valve housing 11 and the second joint 18. It is a solidified part after mixing. The valve housing 11 and the second joint 18 are joined to each other via the second weld 52A.

  Next, an example of a method for manufacturing the motor-operated valve 1A described above will be described with reference to FIGS. 4 (a) and 4 (b).

(1: Welding process)
About the welding of the valve housing 11 and the 1st coupling 17 in the welding process of this embodiment, it is the same as 1st Embodiment mentioned above.

  As shown in FIG. 4A, the valve seat member 12 is inserted into the second communication hole 11 </ b> B of the valve housing 11. The valve housing 11 extends over the entire circumference along the circumferential direction of the second communication hole 11B so as to penetrate the valve housing 11 from the outside of the valve housing 11 and reach the valve seat member 12 in the second communication hole 11B. And after irradiating the laser L so that the valve seat member 12 may be melted simultaneously, the irradiation is stopped. Thereby, the stainless steel constituting the inner peripheral surface portion (that is, the valve housing 11) of the second communication hole 11B and the stainless steel constituting the valve seat member 12 are melted, mixed, and solidified after being mixed. The welded portion 53 is formed over the entire circumference in the circumferential direction of the second communication hole 11B. The valve housing 11 and the valve seat member 12 are joined to each other by the annular direct welded portion 53.

  Moreover, as shown to Fig.4 (a), the one end part of the 2nd joint 18 is inserted inside the ring material 56A made from nickel (Ni) with a flat washer shape and thickness of about 0.1 mm to 0.5 mm, In this state, one end of the second joint 18 is inserted into the second communication hole 11 </ b> B of the valve housing 11. The inner diameter of the ring material 56A is slightly larger than the outer diameter of the second joint 18 and smaller than the outer diameter of the flange portion 18a. In this state, the outer peripheral edge portion 11d of the second communication hole 11B of the valve housing 11, the ring material 56A, and the flange portion 18a of the second joint 18 are sequentially stacked. That is, the second joint 18 is inserted into the second communication hole 11 </ b> B, and the ring material 56 </ b> A is sandwiched between the valve housing 11 and the second joint 18.

  Next, the outer peripheral edge portion 11d of the second communication hole 11B (that is, the valve) over the entire circumference along the circumferential direction (that is, the circumferential direction of the second communication hole 11B) toward the outer peripheral end surface 56a of the ring member 56A. Irradiation is stopped after irradiating the laser L so that the housing 11), the ring material 56A, and the flange portion 18a of the second joint 18 are melted simultaneously. As a result, as shown in FIG. 4 (b), the outer peripheral edge 11d of the second communication hole 11B (ie, the valve housing 11), the stainless steel constituting the ring material 56A, and the second joint 18 are constituted. The copper is melted, mixed, and then solidified to form a second weld 52A between the valve housing 11 and the second joint 18 over the entire circumference of the second communication hole 11B. The valve housing 11 and the second joint 18 are joined to each other by the second weld 52A.

(2: Assembly process)
The assembly process of this embodiment is the same as that of the first embodiment described above. The motor operated valve 1A is completed through the welding process and the assembly process.

  As described above, the motor-operated valve 1 </ b> A of the present embodiment includes the stainless steel valve housing 11 with the valve chamber 10 </ b> A provided on the inner side, and the copper first joint 17 and the second joint 18 joined to the valve housing 11. And. The motor-operated valve 1A includes a first welded portion formed by melting and solidifying each of stainless steel, copper, and nickel by laser welding between the valve housing 11 and the first joint 17 and the second joint 18. 51 and the 2nd welding part 52A are provided, and the valve housing 11, the 1st coupling 17, and the 2nd coupling 18 are mutually joined via the 1st welding part 51 and the 2nd welding part 52A.

  Further, the motor operated valve 1A has a first joint 17 inserted into a first communication hole 11A communicating with the inside and outside of the valve housing 11 formed in the valve housing 11, and a second joint 18 inserted into a second communication hole 11B. Then, a tube member 55 and a ring member 56A made of nickel are sandwiched between the valve housing 11 and the first joint 17 and the second joint 18, and between the valve housing 11 and the first joint 17 and the second joint 18. In addition, along the circumferential direction of the first communication hole 11 </ b> A and the second communication hole 11 </ b> B, a first welded part 51 and a second welded part 52 </ b> A formed by solidifying each of stainless steel, copper, and nickel are formed. It is manufactured by a manufacturing method including a welding process for performing laser welding.

  As described above, according to the present embodiment, in the motor operated valve 1A, between the valve housing 11 and the first joint 17 and the second joint 18, each of stainless steel, copper, and nickel mixed with each other by welding is provided. A first weld 51 and a second weld 52A formed by being melted and solidified by laser welding are provided, and the valve housing 11, the first joint 17, and the second joint 18 are connected to the first weld 51 and the second weld. They are joined to each other via the part 52A. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joint strength of the joint location by welding with the stainless steel valve housing 11 and the copper first joint 17 and the second joint 18 by the first weld 51 and the second weld 52A formed by laser welding is effective. Can be secured.

  In addition, the motor-operated valve 1A inserts the first joint 17 and the second joint 18 into the first communication hole 11A and the second communication hole 11B communicating with the inside and the outside of the valve housing 11 formed in the valve housing 11, and the valve housing. 11 and the first joint 17 and the second joint 18 are sandwiched with a tube material 55 and a ring material 56A made of nickel mixed by welding with stainless steel and copper, and the valve housing 11, the first joint 17 and the second joint 18, the first communication hole 11 </ b> A and the second communication hole 11 </ b> B are formed so as to form the first welded part 51 and the second welded part 52 </ b> A formed by solidifying each of stainless steel, copper, and nickel after melting. It is manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joint strength of the joint location by welding with the stainless steel valve housing 11 and the copper 1st joint 17 and the 2nd joint 18 is effectively securable by the welding part formed by laser welding.

(Third embodiment)
Hereinafter, an electric valve according to a third embodiment of the present invention will be described with reference to FIGS. 5 and 6.

  FIG. 5 is a longitudinal sectional view of a motor-operated valve according to the third embodiment of the present invention. FIG. 6A is a partial cross-sectional view showing a state before welding of the valve housing, the first joint, and the second joint included in the electric valve of FIG. 5, and FIG. 6B is a partial cross-section showing a state after welding. FIG. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in FIG. 5 and indicates the relative positional relationship between the members, and does not indicate the absolute positional relationship.

  As shown in FIG. 5, the electric valve 1 </ b> B includes a valve body 10, a first joint 17, a second joint 18, a valve body part 20, a stepping motor 30, a first welding part 51, and a second welding. A portion 52B and a direct welding portion 54 are provided.

  The motor operated valve 1B shown in FIG. 5 is the motor operated valve 1 according to the first embodiment described above. (1) The valve housing 11 and the valve seat member 12 are formed by direct welding instead of the second welded portion 52. The valve housing 11 and the valve seat member 12 are joined instead of the second welded portion 52 that joins the valve housing 11, the valve seat member 12, and the second joint 18 together. And the second joint 18 are joined to each other, and the other configurations are the same. Therefore, in the following description, the same code | symbol is attached | subjected to the part same as the motor operated valve 1 of 1st Embodiment, and description is abbreviate | omitted.

  The valve seat member 12 is disposed at a location closer to the inside of the valve housing 11 in the second communication hole 11B of the valve housing 11 so that the valve port 12a and the second communication hole 11B communicate with each other. The valve seat member 12 is directly welded and joined to the valve housing 11 without using the tube material 56 or the like in the first embodiment. Specifically, the valve seat member 12 is joined to the valve housing 11 via a direct weld 54 made of stainless steel formed by welding with the valve housing 11. The direct weld 54 is formed over the entire circumference between the inner peripheral surface of the second communication hole 11 </ b> B and the outer peripheral surface of the valve seat member 12. Since both the valve seat member 12 and the valve housing 11 are made of stainless steel, the necessary joint strength can be ensured when joined by direct welding.

  One end of the second joint 18 is inserted and fitted into the second communication hole 11B of the valve housing 11, and the end surface of the one end is welded to the inner peripheral surface of the second communication hole 11B and the lower surface of the valve seat member 12. It is joined by.

  A second welded portion 52 </ b> B is provided at a welding location of the valve housing 11, the valve seat member 12, and the second joint 18. The second welded portion 52B is made of stainless steel constituting the valve housing 11 and the valve seat member 12 between the valve housing 11 and the second joint 18, and between the valve seat member 12 and the second joint 18. The copper and nickel constituting the second joint 18 are melted by laser welding, mixed and then solidified. The valve housing 11, the valve seat member 12, and the second joint 18 are joined to each other through the second welded portion 52B.

  Next, an example of the manufacturing method of the motor-operated valve 1B described above will be described with reference to FIGS. 6 (a) and 6 (b).

(1: Welding process)
About the welding of the valve housing 11 and the 1st coupling 17 in the welding process of this embodiment, it is the same as 1st Embodiment mentioned above.

  As shown in FIG. 6A, a valve seat member 12, a flat washer-shaped nickel (Ni) ring material 56B having a thickness of about 0.1 mm to 0.5 mm, and a second communication hole 11B of the valve housing 11, and One end of the second joint 18 is inserted in order. The ring material 56B has an inner diameter that is substantially the same as the inner diameter of the second joint 18, and an outer diameter that is substantially the same as the outer diameter of the second joint 18 (ie, the diameter of the second communication hole 11B). That is, the valve seat member 12 and the second joint 18 are sequentially arranged in the second communication hole 11B in the axial direction (vertical direction in the drawing) of the second communication hole 11B, and the valve seat member 12 and the second joint 18 are arranged. A ring material 56 </ b> B is sandwiched between the joint 18.

  Next, the inner peripheral surface portion of the second communication hole 11B (that is, the valve housing 11), the ring member 56B, and the valve seat member are formed over the entire circumference from the inside of the valve housing 11 along the circumferential direction of the second communication hole 11B. Irradiation is stopped after irradiating the laser L so that the outer peripheral surface portion of 12 and the outer peripheral surface portion of the second joint 18 melt simultaneously. As a result, as shown in FIG. 6B, the stainless steel constituting the inner peripheral surface portion (that is, the valve housing 11) of the second communication hole 11B, the nickel constituting the ring material 56B, and the valve seat member 12 are constituted. The stainless steel and the copper constituting the second joint 18 are melted, mixed, and then solidified, and the entire circumference of the second communication hole 11B is provided between the valve housing 11, the valve seat member 12, and the second joint 18. A second weld 52B is formed. The valve housing 11, the valve seat member 12, and the second joint 18 are joined to each other by the second welded portion 52B. Further, the stainless steel constituting the inner peripheral surface portion (that is, the valve housing 11) of the second communication hole 11B and the stainless steel constituting the valve seat member 12 are respectively melted and mixed, and then solidified to be combined with the valve housing 11. A weld 54 is formed directly between the valve seat member 12 and the entire circumference of the second communication hole 11B. The valve housing 11 and the valve seat member 12 are joined to each other by the direct weld 54.

(2: Assembly process)
The assembly process of this embodiment is the same as that of the first embodiment described above.

  As described above, the motor-operated valve 1 </ b> B of the present embodiment includes the stainless steel valve housing 11 in which the valve chamber 10 </ b> A is provided on the inner side, and the copper first joint 17 joined to the valve housing 11. Yes. The motor-operated valve 1B includes a first weld 51 formed between the valve housing 11 and the first joint 17 by melting and solidifying each of stainless steel, copper, and nickel by laser welding. The valve housing 11 and the first joint 17 are joined to each other via the first welded portion 51.

  The motor operated valve 1 </ b> B includes a stainless steel valve housing 11 having a valve chamber 10 </ b> A provided therein, a copper second joint 18 joined to the valve housing 11, and a stainless steel valve joined to the valve housing 11. And a seat member 12. In the motor-operated valve 1B, the valve seat member 12 and one end of the second joint 18 are connected to the second communication hole 11B in the second communication hole 11B communicating with the inside and the outside of the valve housing 11 formed in the valve housing 11. 11B are arranged in order in the axial direction of 11B, and are formed by melting and solidifying each of stainless steel, copper, and nickel by laser welding between the valve housing 11, the second joint 18, and the valve seat member 12. Two welded parts 52B are provided, and the valve housing 11, the second joint 18, and the valve seat member 12 are joined to each other via the second welded parts 52B.

  The motor-operated valve 1 </ b> B includes a first joint 17 inserted in a first communication hole 11 </ b> A that communicates with the inside and the outside of the valve housing 11 formed in the valve housing 11, and between the valve housing 11 and the first joint 17. Between the valve housing 11 and the first joint 17, the first weld 51 is formed between the valve housing 11 and the first joint 17 so that each of the stainless steel, copper, and nickel is solidified after being melted. It is manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction of the first communication hole 11A.

  In addition, the motor operated valve 1B has a second communication hole 11B in which a valve seat member 12 and one end of the second joint 18 are connected to each other in a second communication hole 11B communicating with the inside and the outside of the valve housing 11 formed in the valve housing 11. The ring member 56B made of nickel is sandwiched between the valve seat member 12 and the second joint 18, and the valve housing 11, the second joint 18, and the valve seat member 12 are sandwiched. , Manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction of the second communication hole 11B so as to form the second welded portion 52B formed by solidifying each of stainless steel, copper, and nickel after melting. Is done.

  As described above, according to the present embodiment, in the motor operated valve 1B, between the valve housing 11 and the first joint 17, stainless steel, copper, and nickel mixed by welding are melted and solidified by laser welding. The first welding part 51 thus formed is provided, and the valve housing 11 and the first joint 17 are joined to each other via the first welding part 51. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the stainless steel valve housing 11 and the copper 1st coupling 17 is effectively securable by the 1st welding part 51 formed by laser welding.

  In the motor-operated valve 1B, the valve seat member 12 and one end portion of the second joint 18 are connected to the second communication hole 11B in a second communication hole communicating with the inside and outside of the valve housing 11 formed in the valve housing 11. A second weld formed by sequentially arranging the stainless steel, copper, and nickel by laser welding between the valve housing 11, the second joint 18, and the valve seat member 12. The part 52B is provided, and the valve housing 11, the second joint 18, and the valve seat member 12 are joined to each other via the second welding part 52B. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the stainless steel valve housing 11 and the valve seat member 12, and the copper 2nd joint 18 is effectively securable by the 2nd welding part 52B formed by laser welding. Further, since the valve housing 11, the second joint 18 and the valve seat member 12 can be welded simultaneously, the process of welding the valve housing 11 and the second joint 18, and the valve housing 11 and the valve seat member 12 Therefore, it is not necessary to separately perform the process of welding, and therefore, the manufacturing workability can be improved.

  In addition, the motor operated valve 1 </ b> B inserts the first joint 17 into the first communication hole 11 </ b> A communicating with the inside and the outside of the valve housing 11 formed in the valve housing 11, and the stainless steel between the valve housing 11 and the first joint 17. And a tube material 55 made of nickel which is mixed with copper by welding, and between the valve housing 11 and the first joint 17, a first weld 51 is formed by solidifying each of stainless steel, copper and nickel after melting. Is formed by a manufacturing method including a welding step in which laser welding is performed along the circumferential direction of the first communication hole 11A. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the stainless steel valve housing 11 and the copper 1st coupling 17 is effectively securable by the 1st welding part 51 formed by laser welding.

  In addition, the motor-operated valve 1B has a second communication hole 11B in which the valve seat member 12 and one end of the second joint 18 are connected to each other in a second communication hole 11B communicating with the inside and outside of the valve housing 11 formed in the valve housing 11. The ring member 56B made of nickel is sandwiched between the valve seat member 12 and the second joint 18, and the valve housing 11, the second joint 18, and the valve seat member 12 are sandwiched. , Manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction of the second communication hole 11B so as to form the second welded portion 52B formed by solidifying each of stainless steel, copper, and nickel after melting. Has been. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the stainless steel valve housing 11 and the valve seat member 12, and the copper 2nd joint 18 is effectively securable by the 2nd welding part 52B formed by laser welding. Further, since the valve housing 11, the second joint 18 and the valve seat member 12 can be welded simultaneously, the process of welding the valve housing 11 and the second joint 18, and the valve housing 11 and the valve seat member 12 Therefore, it is not necessary to separately perform the process of welding, and therefore, the manufacturing workability can be improved.

(Fourth embodiment)
Hereinafter, a throttle valve device according to a fourth embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 is a partial longitudinal sectional view of a throttle valve device according to a fourth embodiment of the present invention. FIG. 8 is a partial longitudinal sectional view showing a state before welding of the valve housing, the first joint, and the second joint included in the throttle valve device of FIG. 7. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in FIG. 7 and indicates the relative positional relationship between the members, and does not indicate the absolute positional relationship.

  As shown in part in FIG. 7, the throttle valve device 2 includes a valve body 60, a first joint 67, a second joint 68, a valve body part 70, a first welding part 81, and a second welding part. 82 and a plunger and an electromagnetic coil unit (not shown).

  The valve main body 60 has a valve housing 61 and a valve seat member 62.

  The valve housing 61 is, for example, a stainless steel member formed in a cylindrical shape. A first communication hole 61 </ b> A that communicates the inside and the outside of the valve housing 61 is formed at a part of the peripheral wall 61 a of the valve housing 61. The valve housing 61 is preferably made of austenitic stainless steel.

  The valve seat member 62 is a stainless steel member in which a cylindrical portion 62a and a flange portion 62b connected to the lower end of the cylindrical portion 62a in the figure are integrally formed. A valve seat portion 62c that is an annular tapered surface is formed at the upper end of the cylindrical portion 62a in the figure, and a valve body portion 70 described later is seated and separated from the valve seat portion 62c. A plurality of grooves (not shown) extending in the radial direction are formed in the valve seat portion 62c so as to be spaced apart from each other in the circumferential direction. Further, a second communication hole 61B is formed inside the cylindrical portion 62a. The outer diameter of the flange portion 62 b is formed to be the same as the inner diameter of the valve housing 61. The valve seat member 62 is fixedly attached by welding or the like to the vicinity of the lower end of the valve housing 61 in the drawing so that the cylindrical portion 62a is positioned inside the valve housing 61. Thus, the second communication hole 61B communicates the inside and the outside of the valve housing 61. The valve seat member 62, together with the valve housing 61, defines a valve chamber 60 </ b> A.

  The first joint 67 is a copper pipe through which a fluid flows. In the present embodiment, the first joint 67 is made of pure copper. The material constituting the first joint 67 may be copper (including a copper alloy) other than pure copper. The outer diameter of the first joint 67 is formed to be the same as or slightly smaller than the diameter of the first communication hole 61A. One end of the first joint 67 is inserted and fitted into the first communication hole 61A of the valve housing 61, and the outer peripheral surface of the one end is joined to the inner peripheral surface of the first communication hole 61A by welding.

  The second joint 68 is a copper pipe similar to the first joint 67. In the present embodiment, the second joint 68 is made of pure copper. The material constituting the second joint 68 may be copper (including a copper alloy) other than pure copper. The outer diameter of the second joint 68 is the same as or slightly smaller than the diameter of the second communication hole 61B. One end of the second joint 68 is inserted and fitted into the second communication hole 61B of the valve housing 61, and the outer peripheral surface of the one end is joined to the inner peripheral surface of the second communication hole 61B by welding. The first joint 67 and the second joint 68 each correspond to an example of a piping member.

  A first welded portion 81 is provided at a welding location between the valve housing 61 and the first joint 67. The first welding portion 81 is formed by laser welding between stainless steel constituting the valve housing 61, copper constituting the first joint 67, and nickel (Ni) between the valve housing 61 and the first joint 67, respectively. It is a part that has been melted and mixed and then solidified. The valve housing 61 and the first joint 67 are joined to each other through the first welded portion 81.

  A second welded portion 82 is provided at a welding location between the valve seat member 62 and the second joint 68. The second welded portions 82 are laser welded between stainless steel constituting the valve seat member 62, copper constituting the second joint 68, and nickel, respectively, between the valve seat member 62 and the second joint 68. It is a part which is solidified after being melted and mixed. The valve seat member 62 and the second joint 68 are joined to each other via the second weld portion 82.

  Since the 1st welding part 81 and the 2nd welding part 82 are formed including the nickel which mixes with stainless steel and copper by welding in the welding location with stainless steel and copper, compared with the structure which welded stainless steel and copper directly. By interposing nickel, stainless steel and copper are mixed and the respective materials are well adapted to each other, so that poor welding can be suppressed, and therefore the bonding strength can be increased.

  The valve body portion 70 integrally includes a columnar valve shaft portion 71 and a bowl-shaped tip portion 72 provided integrally with the lower end of the valve shaft portion 71 in the drawing. The distal end portion 72 is seated on the valve seat portion 62c of the valve seat member 62, thereby closing the valve port 62d inside the valve seat portion 62c and closing the valve, and the distal end portion 72 is closed to the valve seat member 62. The valve port 62d inside the valve seat portion 62c is opened to be in a valve open state by being separated from the valve seat portion 62c.

  The valve body portion 70 is coupled to a plunger (not shown) at an upper end portion thereof, and an electromagnetic coil portion (not shown) is disposed around the plunger. And by making this electromagnetic coil part into an energized state or a non-energized state, the plunger moves upward or downward, and at the same time, the valve body part 70 also moves upward or downward.

  Next, an example of a manufacturing method of the throttle valve device 2 described above will be described with reference to FIGS.

(1: Assembly process)
In the valve housing 61, the valve body part 70, the plunger not shown, and the electromagnetic coil part are assembled. Then, the valve seat member 62 is fixedly attached to the valve housing 61 by welding so as to close the lower end opening of the valve housing 61.
(2: Welding process)
As shown in FIG. 8, one end of the first joint 67 is inserted into the first communication hole 61 </ b> A of the valve housing 61, and the inner peripheral surface of the first communication hole 61 </ b> A of the valve housing 61 and one end of the first joint 67 are inserted. A nickel (Ni) tube material 85 having a thickness of about 0.1 mm to 0.5 mm is press-fitted between the outer peripheral surface and the outer peripheral surface. Or, after fitting the tube material 85 into the first communication hole 61 </ b> A first, one end portion of the first joint 67 may be press-fitted inside the tube material 85. That is, the first joint 67 is inserted into the first communication hole 61 </ b> A, and the tube material 85 is sandwiched between the valve housing 61 and the first joint 67.

  Next, the inner peripheral surface portion of the first communication hole 61A (that is, the valve housing 61), the tube member 85, and the first joint are formed over the entire circumference from the outside of the valve housing 61 along the circumferential direction of the first communication hole 61A. Irradiation is stopped after irradiating the laser L so that the outer peripheral surface portion 67 melts simultaneously. Thereby, as shown in FIG. 7, the stainless steel constituting the inner peripheral surface portion of the first communication hole 61A (that is, the valve housing 61), the nickel constituting the tube material 85, and the copper constituting the first joint 67 are The first welded portion 81 is formed over the entire circumference of the first communication hole 61 </ b> A between the valve housing 61 and the first joint 67 by being melted, mixed, and solidified. The valve housing 61 and the first joint 67 are joined to each other by the first welding portion 81.

  Further, as shown in FIG. 8, the valve seat member 62 and one end of the second joint 68 are inserted into the second communication hole 61B of the valve seat member 62, and the inner peripheral surface of the second communication hole 61B of the valve seat member 62 And a tube material 86 made of nickel (Ni) having a thickness of about 0.1 mm to 0.5 mm is press-fitted between the outer peripheral surface of one end of the second joint 68. Alternatively, the second joint 68 may be press-fitted inside the tube material 86 after the tube material 86 is first fitted into the second communication hole 61B. That is, the second joint 68 is inserted into the second communication hole 61B, and the tube material 86 is sandwiched between the valve seat member 62 and the second joint 68.

  Next, the inner peripheral surface portion of the second communication hole 61B (that is, the valve seat member 62), the tube member 86, and the second member are formed over the entire circumference from the outside of the valve seat member 62 along the circumferential direction of the second communication hole 61B. After irradiating the laser L so that the outer peripheral surface part of the two joints 68 is melted simultaneously, the irradiation is stopped. As a result, as shown in FIG. 7, the stainless steel constituting the inner peripheral surface portion (that is, the valve seat member 62) of the second communication hole 61B, the nickel constituting the tube member 86, and the copper constituting the second joint 68 are formed. The second welded portion 82 is formed over the entire circumference of the second communication hole 61B between the valve seat member 62 and the second joint 68 by being melted, mixed, and solidified. The valve seat member 62 and the second joint 68 are joined to each other by the second welded portion 82. The throttle valve device 2 is completed through these assembly steps and welding steps in sequence.

  As described above, the throttle valve device 2 of the present embodiment includes the stainless steel valve housing 61 in which the valve chamber 60 </ b> A is provided inside, and the first copper joint 67 joined to the valve housing 61. ing. The throttle valve device 2 is provided with a first welded portion 81 formed by melting and solidifying each of stainless steel, copper, and nickel by laser welding between the valve housing 61 and the first joint 67. The valve housing 61 and the first joint 67 are joined to each other via the first welded portion 81.

  The throttle valve device 2 includes a stainless steel valve housing 61 having a valve chamber 60 </ b> A provided therein, and a stainless steel valve seat member 62 that is attached to the valve housing 61 and defines the valve chamber 60 </ b> A together with the valve housing 61. And a copper second joint 68 joined to the valve seat member 62. The throttle valve device 2 is provided with a second weld portion 82 formed by melting and solidifying each of stainless steel, copper, and nickel by laser welding between the valve seat member 62 and the second joint 68. The valve seat member 62 and the second joint 68 are joined to each other via the second welded portion 82.

  The throttle valve device 2 includes a first joint 67 inserted into a first communication hole 61 </ b> A communicating with the inside and the outside of the valve housing 61 formed in the valve housing 61, and between the valve housing 61 and the first joint 67. Between the valve housing 61 and the first joint 67, the first welded portion 81 is formed between the valve housing 61 and the first joint 67 so that each of the stainless steel, copper, and nickel is solidified after being melted. It is manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction of the first communication hole 61A.

  In addition, the throttle valve device 2 inserts the second joint 68 into the second communication hole 61 </ b> B communicating with the inside and the outside of the valve housing 61 formed in the valve seat member 62, and between the valve seat member 62 and the second joint 68. And the second welded portion 82 is formed between the valve seat member 62 and the second joint 68 and is solidified after melting of stainless steel, copper, and nickel. Furthermore, it is manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction of the second communication hole 61B.

  As described above, according to the present embodiment, in the throttle valve device 2, between the valve housing 61 and the first joint 67, stainless steel, copper, and nickel mixed together by welding are melted by laser welding. A solidified first welded portion 81 is provided, and the valve housing 61 and the first joint 67 are joined to each other via the first welded portion 81. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the valve housing 61 made of stainless steel and the first joint 67 made of copper can be effectively ensured by the first welding portion 81 formed by laser welding.

  Further, in the throttle valve device 2, a stainless steel, copper, and nickel mixed with each other by welding are melted and solidified by laser welding between the valve seat member 62 and the second joint 68. Two welds 82 are provided, and the valve seat member 62 and the second joint 68 are joined to each other via the second welds 82. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the valve seat member 62 made of stainless steel and the second joint 68 made of copper can be effectively ensured by the second welding portion 82 formed by laser welding.

  Further, the throttle valve device 2 inserts a first joint 67 into a first communication hole 61 </ b> A communicating with the inside and the outside of the valve housing 61 formed in the valve housing 61, and between the valve housing 61 and the first joint 67. A tube material 85 made of nickel mixed by welding with stainless steel and copper is sandwiched, and the first welded portion is formed by solidifying each of stainless steel, copper and nickel after melting between the valve housing 61 and the first joint 67. It is manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction of the first communication hole 61A so that 81 is formed. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the valve housing 61 made of stainless steel and the first joint 67 made of copper can be effectively ensured by the first welding portion 81 formed by laser welding.

  Further, the throttle valve device 2 inserts the second joint 68 into the second communication hole 61 </ b> B that communicates the inside and the outside of the valve housing 61 formed in the valve seat member 62, and between the valve seat member 62 and the second joint 68. A tube material 86 made of nickel that is mixed with stainless steel and copper by welding is sandwiched between the valve seat member 62 and the second joint 68, and the second stainless steel, copper, and nickel are solidified after melting. It is manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction of the second communication hole 61 </ b> B so that the weld portion 82 is formed. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the valve seat member 62 made of stainless steel and the second joint 68 made of copper can be effectively ensured by the second welding portion 82 formed by laser welding.

(Fifth embodiment)
Hereinafter, a flow path switching valve according to a fifth embodiment of the present invention will be described with reference to FIGS. 9 and 10.

  FIG. 9 is a longitudinal sectional view of a flow path switching valve according to a fifth embodiment of the present invention. FIG. 10 is a longitudinal sectional view showing a state before welding of the valve main body and the valve seat member, and the first joint, the second joint, the third joint, and the fourth joint included in the flow path switching valve of FIG. 9. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in FIG. 9 and indicates the relative positional relationship of each member, and does not indicate the absolute positional relationship.

  As shown in FIG. 9, the flow path switching valve 3 includes a valve body 101, two pistons 102, 102, a connecting member 103, a valve seat member 104, a valve body portion 105, a first joint 121, A two joint 122, a third joint 123, a fourth joint 124, a first welded portion 161, a second welded portion 162, a third welded portion 163, and a fourth welded portion 164 are provided.

  The valve body 101 is made of stainless steel, and integrally includes a cylindrical cylindrical portion 101a and two disc-shaped cap portions 101b and 101b. The cap portions 101b and 101b are attached to the cylindrical portion 101a by welding or the like so as to close the end portions of the cylindrical portion 101a. The central axis of the cylindrical portion 101a and the cap portions 101b and 101b is the axis L1 of the valve body 101. The valve body 101 is preferably made of austenitic stainless steel. In addition, a communication hole 101c is formed at a position facing an after-mentioned valve seat member 104 in an intermediate portion of the cylindrical portion 101a. A first fixed port F1 is formed on the end of the communication hole 101c closer to the inside of the valve body 101.

  The two pistons 102 and 102 are connected to each other by a connecting member 103, are disposed in the valve main body 101 so as to face each other in the direction of the axis L1, and are movable in the direction of the axis L1. The two pistons 102 and 102 are disposed in the valve main body 101 so that the main valve chamber 101A in the center and the two sub valve chambers 101B and 101C on both sides of the main valve chamber 101A are disposed in the valve main body 101. It is divided into. The sub valve chambers 101B and 101C include spaces in the two cap portions 101b and 101b, respectively.

  The valve seat member 104 is made of stainless steel, and is fixed to the valve main body 101 by welding at an intermediate portion of the main valve chamber 101A. The valve seat member 104, together with the valve body 101, defines a main valve chamber 101A. In the valve seat member 104, a first communication hole 104a, a second communication hole 104b, and a third communication hole 104c are formed in a straight line in the direction of the axis L1 of the valve body 101. One end of each of the first communication hole 104a, the second communication hole 104b, and the third communication hole 104c is opened toward the outside of the valve body 101. That is, the first communication hole 104a, the second communication hole 104b, and the third communication hole 104c communicate with the inside and the outside of the valve body 101. The valve seat member 104 has a first communication port 104a, a second communication hole 104b, and a third communication hole 104c on the other end side of the first switching port C1, which opens toward the main valve chamber 101A, A second fixed port F2 and a second switching port C2 are formed.

  The valve body 105 is disposed on the valve seat member 104 so as to be slidable in the direction of the axis L1 of the valve main body 101. The valve body 105 is shaped like a bowl, and a main valve recess 105A is formed on the inside thereof. The valve body 105 is connected to the two pistons 102 and 102 via the connecting member 103 and moves together with the two pistons 102 and 102.

  The first joint 121 is a copper pipe through which a fluid flows. In the present embodiment, the first joint 121 is made of pure copper. In this specification, “copper” includes copper alloy containing copper and other substances in addition to pure copper (purity 99.9% or more). Any copper alloy may be used as long as it contains more than 50% by weight of copper as a main component, but oxygen-free copper, tough pitch copper, phosphorous deoxidized copper, aluminum bronze, or the like is particularly preferable. The outer diameter of the first joint 121 is formed to be the same as or slightly smaller than the diameter of the communication hole 101c. One end of the first joint 121 is inserted and fitted into the communication hole 101c, and the outer peripheral surface of the one end is joined to the inner peripheral surface of the communication hole 101c (that is, the valve body 101) by welding.

  The second joint 122 is a copper pipe similar to the first joint 121. In the present embodiment, the second joint 122 is made of pure copper. The outer diameter of the second joint 122 is formed to be the same as or slightly smaller than the diameter of the first communication hole 104a. One end of the second joint 122 is inserted and fitted into the first communication hole 104a of the valve seat member 104, and the outer peripheral surface of the one end is the inner peripheral surface of the first communication hole 104a (that is, the valve seat member 104). ) And the vicinity of the first communication hole 104a in the valve body 101 by welding.

  The third joint 123 is a copper pipe similar to the first joint 121. In the present embodiment, the third joint 123 is made of pure copper. The outer diameter of the third joint 123 is formed to be the same as or slightly smaller than the diameter of the second communication hole 104b. One end of the third joint 123 is inserted and fitted into the second communication hole 104b of the valve seat member 104, and the outer peripheral surface of the one end is the inner peripheral surface of the second communication hole 104b (that is, the valve seat member 104). ) And welding.

  The fourth joint 124 is a copper pipe similar to the first joint 121. In the present embodiment, the fourth joint 124 is made of pure copper. The outer diameter of the fourth joint 124 is the same as or slightly smaller than the diameter of the third communication hole 104c. One end of the fourth joint 124 is inserted and fitted into the third communication hole 104c of the valve seat member 104, and the outer peripheral surface of the one end is the inner peripheral surface of the third communication hole 104c (that is, the valve seat member 104). ) And the vicinity of the third communication hole 104c in the valve body 101 by welding. The first joint 121, the second joint 122, the third joint 123, and the fourth joint 124 each correspond to an example of a piping member.

  A first welded portion 161 is provided at a welding location between the valve body 101 and the first joint 121. The first welded portion 161 is formed by laser welding between stainless steel constituting the valve body 101, copper constituting the first joint 121, and nickel (Ni) between the valve body 101 and the first joint 121. It is a part that has been melted and mixed and then solidified. The valve body 101 and the first joint 121 are joined to each other via the first welded portion 161.

  A second welded portion 162 is provided at a welding location between the valve body 101 and the valve seat member 104 and the second joint 122. The second weld 162 is a valve between the valve body 101 and the valve seat member 104, between the valve body 101 and the second joint 122, and between the valve seat member 104 and the second joint 122. The stainless steel that constitutes the main body 101 and the valve seat member 104, the copper that constitutes the second joint 122, and nickel are melted by laser welding, mixed, and then solidified. The valve body 101, the valve seat member 104, and the second joint 122 are joined to each other through the second welded portion 162.

  A third welded portion 163 is provided at a welding location between the valve seat member 104 and the third joint 123. In the third welded portion 163, between the valve seat member 104 and the third joint 123, stainless steel constituting the valve seat member 104, copper constituting the third joint 123, and nickel (Ni) are lasers, respectively. It is a part that has been melted by welding and mixed and then solidified. The valve seat member 104 and the third joint 123 are joined to each other via the third welded portion 163.

  A fourth welded portion 164 is provided at a welding location between the valve body 101 and the valve seat member 104 and the fourth joint 124. The fourth welded portion 164 is provided between the valve body 101 and the valve seat member 104, between the valve body 101 and the fourth joint 124, and between the valve seat member 104 and the fourth joint 124, respectively. The stainless steel that constitutes the main body 101 and the valve seat member 104, the copper that constitutes the fourth joint 124, and nickel are melted by laser welding, mixed, and then solidified. The valve main body 101, the valve seat member 104, and the fourth joint 124 are joined to each other through the fourth welded portion 164.

  The 1st welding part 161, the 2nd welding part 162, the 3rd welding part 163, and the 4th welding part 164 are formed including nickel which mixes with stainless steel and copper by welding in the welding part with stainless steel and copper. Therefore, compared to a configuration in which stainless steel and copper are directly welded, the presence of nickel intermixes stainless steel and copper so that the respective materials become familiar with each other, so that poor welding can be suppressed, and therefore the bonding strength can be increased. it can.

  Conduit lines 115f and 115g connected to a pilot valve (not shown) are connected to the cap portions 101b and 101b of the valve body 101, respectively. Then, for example, when the pilot valve operates to lower the sub valve chamber 101B on the left side in the figure and the sub valve chamber 101C on the right side in the figure to high pressure, the pistons 102 and 102 move to the left in the figure. As the pistons 102 move, the valve body 105 also moves leftward in the figure. On the other hand, for example, when the sub valve chamber 101B is set to a high pressure and the sub valve chamber 101C is set to a low pressure by the operation of the pilot valve, the pistons 102 and 102 move to the right in the figure, and these pistons 102 , 102, the valve body 105 also moves to the right in the figure.

And the valve body part 105 connects the 2nd fixed port F2 and the 1st switching port C1 by the main valve recessed part 105A in the edge part position of the left side of FIG. At this time, the second switching port C2 communicates with the first fixed port F1 in the main valve chamber 101A. Further, the valve body portion 105 communicates the second fixed port F2 and the second switching port C2 through the main valve recess 105A at the end position on the right side of FIG. At this time, the first switching port C1 communicates with the first fixed port F1 in the main valve chamber 101A. In this way, the flow path switching valve 3 includes the first fixed port F1, the first switching port C1, the second connection to which the first joint 121, the second joint 122, the third joint 123, and the fourth joint 124 are connected. The flow path is switched by switching the connection relationship between the fixed port F2 and the second switching port C2.
Next, an example of a method for manufacturing the above-described flow path switching valve 3 will be described with reference to FIGS.

(1: Welding process)
As shown in FIG. 10, one end of the first joint 121 is inserted into the communication hole 101 c of the valve main body 101 (specifically, the cylindrical portion 101 a and hereinafter the same in the welding process). A first tube material 171 made of nickel (Ni) having a thickness of about 0.1 mm to 0.5 mm is press-fitted between the inner peripheral surface of the hole 101 c and the outer peripheral surface of one end of the first joint 121. Or after fitting the 1st tube material 171 to the communicating hole 101c previously, you may press-fit the one end part of the 1st coupling 121 inside the 1st tube material 171. That is, the first joint 121 is inserted into the communication hole 101c, and the first tube member 171 is sandwiched between the valve body 101 and the first joint 121.

  Next, the inner peripheral surface portion of the communication hole 101 c (that is, the valve main body 101), the first tube material 171, and the first joint 121 are formed over the entire circumference from the outside of the valve main body 101 along the circumferential direction of the communication hole 101 c. Irradiation is stopped after irradiating the laser L so that the outer peripheral surface portions melt simultaneously. Thereby, as shown in FIG. 9, the stainless steel constituting the inner peripheral surface portion of the communication hole 101c (that is, the valve body 101), the nickel constituting the first tube member 171 and the copper constituting the first joint 121 are The first welded portion 161 is formed over the entire circumference of the communication hole 101 c between the valve body 101 and the first joint 121 by being melted, mixed, and solidified. The valve body 101 and the first joint 121 are joined to each other by the first welded portion 161.

  Further, as shown in FIG. 10, one end of the second joint 122 is inserted into the first communication hole 104 a of the valve seat member 104, and the inner peripheral surface of the first communication hole 104 a of the valve seat member 104 and the second joint 122. A second tube material 172 made of nickel (Ni) having a thickness of about 0.1 mm to 0.5 mm is press-fitted between the outer peripheral surface of one end of the first and second ends. Or after fitting the 2nd tube material 172 to the 1st communicating hole 104a previously, you may press-fit the 2nd coupling 122 inside the 2nd tube material 172. That is, the second joint 122 is inserted into the first communication hole 104 a and the second tube material 172 is sandwiched between the valve seat member 104 and the second joint 122.

  Next, the inner peripheral surface portion of the first communication hole 104a (that is, the valve seat member 104) and the second tube member 172 are extended from the outside of the valve main body 101 over the entire circumference along the circumferential direction of the first communication hole 104a. Then, after irradiating the laser L so that the vicinity of the first communication hole 104a in the valve body 101 and the outer peripheral surface portion of the second joint 122 are melted simultaneously, the irradiation is stopped. As a result, as shown in FIG. 9, the stainless steel constituting the inner peripheral surface portion (that is, the valve seat member 104) of the first communication hole 104a, the nickel constituting the second tube member 172, and the stainless steel constituting the valve body 101. The copper constituting the second joint 122 is melted, mixed, and then solidified, and the first joint hole 104a is surrounded by the first circumference through the entire circumference of the first communication hole 104a between the valve body 101, the valve seat member 104, and the second joint 122. Two welds 162 are formed. The valve body 101, the valve seat member 104, and the second joint 122 are joined to each other by the second welded portion 162.

  Also, as shown in FIG. 10, one end of the third joint 123 is inserted into the second communication hole 104 b of the valve seat member 104, and the inner peripheral surface of the second communication hole 104 b of the valve seat member 104 and the third joint 123. A third tube material 173 made of nickel (Ni) having a thickness of about 0.1 mm to 0.5 mm is press-fitted between the outer peripheral surface of the one end portion of the tube. Or after fitting the 3rd tube material 173 to the 2nd communicating hole 104b previously, you may press-fit the 3rd joint 123 inside the 3rd tube material 173. That is, the third joint 123 is inserted into the second communication hole 104 b and the third tube member 173 is sandwiched between the valve seat member 104 and the third joint 123.

  Next, the inner peripheral surface portion of the second communication hole 104b (that is, the valve seat member 104) and the second tube member 172 are extended from the outside of the valve main body 101 along the circumferential direction of the second communication hole 104b from the outside. And after irradiating the laser L so that the outer peripheral surface part of the 3rd joint 123 may fuse | melt simultaneously, irradiation is stopped. As a result, as shown in FIG. 9, stainless steel constituting the inner peripheral surface portion (that is, the valve seat member 104) of the second communication hole 104b, nickel constituting the third tube member 173, and the third joint 123 are constituted. The copper is melted and mixed and then solidified, and a third weld 163 is formed between the valve seat member 104 and the third joint 123 over the entire circumference of the second communication hole 104b. The valve seat member 104 and the third joint 123 are joined to each other by the third welded portion 163.

  Further, as shown in FIG. 10, one end of the fourth joint 124 is inserted into the third communication hole 104 c of the valve seat member 104, and the inner peripheral surface of the third communication hole 104 c of the valve seat member 104 and the fourth joint 124. A fourth tube material 174 made of nickel (Ni) having a thickness of about 0.1 mm to 0.5 mm is press-fitted between the outer peripheral surface of the first end portion. Or after fitting the 4th tube material 174 to the 3rd communicating hole 104c previously, you may press-fit the 4th coupling 124 inside the 4th tube material 174. FIG. That is, the fourth joint 124 is inserted into the third communication hole 104 c and the fourth tube member 174 is sandwiched between the valve seat member 104 and the fourth joint 124.

  Next, the inner peripheral surface portion of the third communication hole 104c (that is, the valve seat member 104) and the fourth tube member 174 are extended from the outside of the valve body 101 over the entire circumference along the circumferential direction of the third communication hole 104c. Then, after irradiating the laser L so that the portion near the third communication hole 104c in the valve body 101 and the outer peripheral surface portion of the fourth joint 124 are melted simultaneously, the irradiation is stopped. As a result, as shown in FIG. 9, the stainless steel constituting the inner peripheral surface portion (that is, the valve seat member 104) of the third communication hole 104c, the nickel constituting the fourth tube member 174, and the stainless steel constituting the valve body 101. And the copper constituting the fourth joint 124 are melted and mixed, and then solidified, and the fourth joint 124 is placed between the valve body 101, the valve seat member 104, and the fourth joint 124 over the entire circumference of the third communication hole 104c. Four welds 164 are formed. The valve body 101, the valve seat member 104, and the fourth joint 124 are joined to each other by the fourth welded portion 164.

(2: Assembly process)
Next, an assembly in which the two pistons 102 and 102 and the connecting member 103 are assembled to each other is inserted into the cylindrical portion 101a of the valve body 101 and disposed at a predetermined location, and the conduit 115f is connected to both ends of the cylindrical portion 101a. , 115g, and two cap portions 101b, 101b, which are respectively attached, are fixed by welding. The flow path switching valve 3 is completed through the welding process and the assembly process.

  As described above, the flow path switching valve 3 of the present embodiment includes the stainless valve body 101 in which the main valve chamber 101 </ b> A and the sub valve chambers 101 </ b> B and 101 </ b> C are provided, and the copper valve body 101 joined to the valve body 101. The first joint 121 is provided. The flow path switching valve 3 is provided with a first welded portion 161 formed by melting and solidifying stainless steel, copper, and nickel by laser welding between the valve body 101 and the first joint 121. The valve body 101 and the first joint 121 are joined to each other via the first welded portion 161.

  The flow path switching valve 3 includes a main valve chamber 101A and sub valve chambers 101B and 101C, which are made of stainless steel. The main valve chamber 101A is attached to the valve main body 101 together with the main valve chamber 101. A stainless steel valve seat member 104, and a copper second joint 122, a third joint 123, and a fourth joint 124 joined to the valve seat member 104. In the flow path switching valve 3, stainless steel, copper, and nickel are melted and solidified by laser welding between the valve seat member 104 and the second joint 122, the third joint 123, and the fourth joint 124. The second welded portion 162, the third welded portion 163, and the fourth welded portion 164 are provided, and the valve seat member 104, the second joint 122, the third joint 123, and the fourth joint 124 are respectively connected to the second welded portion 162. The welded portion 162, the third welded portion 163, and the fourth welded portion 164 are joined together.

  Further, the flow path switching valve 3 includes a first joint 121 inserted into a communication hole 101 c formed in the valve body 101 that communicates the inside and the outside of the valve body 101, and nickel between the valve body 101 and the first joint 121. The first tube member 171 is sandwiched, and the first welded portion 161 is formed between the valve body 101 and the first joint 121, in which stainless steel, copper, and nickel are solidified after melting. It is manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction of the communication hole 101c.

  Further, the flow path switching valve 3 includes a first joint hole 104a, a second communication hole 104b, and a third communication hole 104c that communicate with the inside and the outside of the valve body 101 formed in the valve seat member 104. The third joint member 123 and the fourth joint member 124 are inserted, and the second tube member 172 and the third tube member 173 made of nickel are interposed between the valve seat member 104 and the second joint member 122 and the third joint member 123 and the fourth joint member 124. And the fourth tube member 174 is sandwiched between the valve seat member 104 and the second joint 122, the third joint 123, and the fourth joint 124, and each of stainless steel, copper, and nickel is solidified after melting. In the circumferential direction of the first communication hole 104a, the second communication hole 104b, and the third communication hole 104c, the second welded part 162, the third welded part 163, and the fourth welded part 164 are formed. Produced by the production method including a welding step of performing laser welding me.

  As described above, according to the present embodiment, in the flow path switching valve 3, between the valve body 101 and the first joint 121, each of stainless steel, copper, and nickel mixed by welding is laser-welded. A first welded portion 161 formed by melting and solidifying is provided, and the valve body 101 and the first joint 121 are joined to each other via the first welded portion 161. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the valve body 101 made of stainless steel and the first joint 121 made of copper can be effectively ensured by the first welding portion 161 formed by laser welding.

  Further, in the flow path switching valve 3, between the valve seat member 104 and the second joint 122, the third joint 123, and the fourth joint 124, each of stainless steel, copper, and nickel mixed together by welding. A second welded portion 162, a third welded portion 163, and a fourth welded portion 164 formed by being melted and solidified by laser welding are provided, and the valve seat member 104, the second joint 122, the third joint 123, and the fourth joint 124 are provided. Are joined to each other through the second welded portion 162, the third welded portion 163, and the fourth welded portion 164. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thus, the stainless steel valve seat member 104 and the copper second joint 122, the third joint 123, and the fourth joint are formed by the second welded portion 162, the third welded portion 163, and the fourth welded portion 164 formed by laser welding. It is possible to effectively secure the joint strength of the joint portion by welding with 124.

  In addition, the flow path switching valve 3 inserts the first joint 121 into a communication hole 101 c communicating with the inside and the outside of the valve body 101 formed in the valve body 101, and is stainless steel between the valve body 101 and the first joint 121. And the first tube material 171 made of nickel mixed by welding with copper and sandwiched between the valve main body 101 and the first joint 121, and each of stainless steel, copper and nickel is solidified after melting. It is manufactured by a manufacturing method including a welding process in which laser welding is performed along the circumferential direction of the communication hole 101c so that the portion 161 is formed. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the valve body 101 made of stainless steel and the first joint 121 made of copper can be effectively ensured by the first welding portion 161 formed by laser welding.

  The flow path switching valve 3 is connected to the first communication hole 104a, the second communication hole 104b, and the third communication hole 104c that communicate the inside and the outside of the valve main body 101 formed in the valve seat member 104 with the second joint 122, the third. The second tube member 172 made of nickel is inserted between the valve seat member 104 and the second joint 122, the third joint 123, and the fourth joint 124 together with stainless steel and copper by welding while inserting the joint 123 and the fourth joint 124. The third tube member 173 and the fourth tube member 174 are sandwiched, and stainless steel, copper, and nickel are melted between the valve seat member 104 and the second joint 122, the third joint 123, and the fourth joint 124. The first communication hole 104a, the second communication hole 104b, and the third welding hole are formed so that the second welding part 162, the third welding part 163, and the fourth welding part 164 that are solidified later are formed. It is manufactured by a manufacturing method comprising a welding step of performing laser welding along the circumferential direction of the through hole 104c. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thus, the stainless steel valve seat member 104 and the copper second joint 122, the third joint 123, and the fourth joint are formed by the second welded portion 162, the third welded portion 163, and the fourth welded portion 164 formed by laser welding. It is possible to effectively secure the joint strength of the joint portion by welding with 124.

(Sixth embodiment)
Hereinafter, a check valve according to a sixth embodiment of the present invention will be described with reference to FIGS.

  FIG. 11 is a longitudinal sectional view of a check valve according to a sixth embodiment of the present invention. 12 is a longitudinal sectional view showing a state before welding between the copper pipe and the valve seat member provided in the check valve of FIG. 11. FIG. 13 is a longitudinal sectional view showing a configuration of a modified example of the check valve of FIG. 14 is a longitudinal sectional view showing a state before welding between the copper pipe and the valve seat member provided in the check valve of FIG.

  As shown in FIG. 11, the check valve 4 includes a copper pipe 201 as a valve housing, a valve seat member 202, a holder member 203, a valve body portion 204, and a welded portion 261.

  This check valve 4 is inserted in series, such as a pipe through which the fluid flows, and allows flow in one direction of the fluid (the direction from the left to the right in the figure), and the other direction opposite to the one direction (in the figure, It regulates the flow in the direction from right to left).

  The copper pipe 201 is a cylindrical piping member made of copper as a material.

  The valve seat member 202 is made of stainless steel and has a substantially cylindrical shape whose outer diameter is substantially equal to or slightly smaller than the inner diameter of the copper tube 201. A valve port 202 a is formed inside the valve seat member 202. The valve seat member 202 is inserted inside the copper pipe 201 and joined to the copper pipe 201 by welding. The valve seat member 202 is preferably made of austenitic stainless steel.

  The holder member 203 is made of stainless steel and has a bowl shape. The holder member 203 is disposed in the copper pipe 201 so as to be aligned with the valve seat member 202 in the axial direction, and is engaged with the end of the valve seat member 202 so that one end thereof grasps the valve seat member 202 from the outside. Is fixed.

  The valve body portion 204 is a plate-like member made of stainless steel. The valve body portion 204 is disposed in the holder member 203 so as to be movable in the left-right direction in the figure, and is moved in the left-right direction in the figure due to a difference in fluid pressure acting on both surfaces. When the valve body portion 204 is moved to the right side in the drawing and comes into contact with the stopper piece 203a of the holder member 203, a gap is formed between the holder member 203 and the valve body portion 204, and the fluid flows. Permissible. Further, when the valve body portion 204 is moved to the left side in the drawing and is brought into contact with (i.e., seated on) the valve seat member 202, the valve port 202a is closed and the fluid flow is restricted.

  A welded portion 261 is provided at a welding location between the copper pipe 201 and the valve seat member 202. In the welded portion 261, copper constituting the copper tube 201, stainless steel constituting the valve seat member 202, and nickel (Ni) are melted by laser welding between the copper tube 201 and the valve seat member 202, respectively. It is a solidified part after mixing. The copper pipe 201 and the valve seat member 202 are joined to each other through the welded portion 261.

  The welded portion 261 is formed by including nickel mixed with stainless steel and copper at the welding location with stainless steel and copper, and therefore, by interposing nickel as compared with a configuration in which stainless steel and copper are directly welded. Since stainless steel and copper are mixed and the respective materials are well adapted to each other, poor welding can be suppressed, and therefore the bonding strength can be increased.

  Next, an example of a method for manufacturing the check valve 4 described above will be described with reference to FIGS.

(1: Assembly process)
After accommodating the valve body portion 204 in the holder member 203, one end of the holder member 203 is locked to the end portion of the valve seat member 202, and an assembly comprising the valve seat member 202, the holder member 203, and the valve body portion 204. Assemble.
(2: Welding process)
In FIG. 12, the assembly assembled in the above assembly process is inserted inside the copper tube 201, and the thickness is 0.1 mm to 0.00 mm between the inner peripheral surface of the copper tube 201 and the outer peripheral surface of the valve seat member 202. A tube material 285 made of nickel (Ni) of about 5 mm is press-fitted. Alternatively, after the tube material 285 is first fitted inside the copper tube 201, the assembly may be press-fitted inside the tube material 285. That is, the valve seat member 202 is inserted inside the copper tube 201 and the tube material 285 is sandwiched between the copper tube 201 and the valve seat member 202.

  Next, the laser L so that the inner peripheral surface portion of the copper tube 201, the tube material 285, and the outer peripheral surface portion of the valve seat member 202 are simultaneously melted over the entire circumference along the circumferential direction of the inner peripheral surface of the copper tube 201. After irradiation, the irradiation is stopped. As a result, as shown in FIG. 11, the copper constituting the copper tube 201, the nickel constituting the tube material 285, and the stainless steel constituting the valve seat member 202 are respectively melted and mixed, and then solidified to form a copper tube. A welded portion 261 is formed between the inner periphery of the copper pipe 201 between the valve seat member 202 and the valve seat member 202. The welded portion 261 joins the copper pipe 201 and the valve seat member 202 to each other. The check valve 4 is completed through these assembly steps and welding steps in sequence.

  As described above, the check valve 4 of this embodiment includes the copper pipe 201 and the stainless steel valve seat member 202 joined to the inside of the copper pipe 201. And between the copper pipe 201 and the valve-seat member 202, the welding part 261 formed by melt | dissolving and solidifying each of stainless steel, copper, and nickel mixed with these by laser welding is provided. The pipe 201 and the valve seat member 202 are joined to each other via a welded portion 261.

  Further, the check valve 4 has a valve seat member 202 inserted inside the copper pipe 201, a tube material 285 made of nickel between the copper pipe 201 and the valve seat member 202, and the copper pipe 201 and the valve It is manufactured by a manufacturing method including a welding process in which laser welding is performed so that a welded portion 261 is formed between the seat member 202 and each of stainless steel, copper, and nickel solidified after melting.

  As described above, according to the present embodiment, in the check valve 4, between the copper pipe 201 made of copper and the valve seat member 202 made of stainless steel, each of stainless steel, copper, and nickel mixed together by welding. Is provided by welding and solidifying by laser welding, and the copper pipe 201 and the valve seat member 202 are joined to each other via the welded portion 261. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the copper copper pipe 201 and the stainless steel valve seat member 202 is effectively securable by the welding part 261 formed by laser welding. That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member.

  Further, conventionally, in such a check valve, a groove is provided on the outer peripheral surface of the valve seat member over the entire circumference, and the copper pipe is reduced in diameter along the groove, thereby caulking the copper pipe and the valve seat member. However, in such a configuration, the caulking portion of the copper pipe may become fatigued due to the influence of vibration or the like, and the sealing between the copper pipe and the valve seat member may be caused by variations in the caulking degree. However, there was a fear that it could not be secured sufficiently. In this embodiment, by providing the welded portion 261, it is possible to eliminate the fatigue of the caulking portion of the copper tube and to sufficiently ensure the sealing between the copper tube and the valve seat member.

  In addition, the check valve 4 inserts a valve seat member 202 inside the copper pipe 201 and sandwiches a tube material 285 made of nickel mixed with stainless steel and copper by welding between the copper pipe 201 and the valve seat member 202. And the welding process which laser-welds so that the welding part 261 formed by each of stainless steel, copper, and nickel solidifying after melting may be formed between the copper pipe 201 made of copper and the valve seat member 202 made of stainless steel. It is manufactured with the manufacturing method containing. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by welding with the copper copper pipe 201 and the stainless steel valve seat member 202 is effectively securable by the welding part 261 formed by laser welding. That is, it is possible to effectively ensure the bonding strength of the bonding portion by welding between the stainless steel member and the copper member.

  In the present embodiment, in the welding process, the welded portion 261 is formed by irradiating the laser L from the inside of the copper tube 201, but the present invention is not limited to this. For example, it is good also as a structure which irradiated the laser L from the outer side of the copper pipe 201, and formed the welding part 262 in the welding process. Specifically, in the welding process, as shown in FIG. 14, the outer peripheral surface portions of the copper pipe 201, the tube material 285, and the valve seat member 202 are formed over the entire circumference along the circumferential direction of the outer peripheral surface of the copper pipe 201. After irradiating the laser L so as to melt at the same time, the irradiation is stopped. As a result, as shown in FIG. 13, the copper constituting the copper tube 201, the nickel constituting the tube material 285, and the stainless steel constituting the valve seat member 202 are respectively melted and mixed, and then solidified to form a copper tube. A welded portion 262 extending from the outer peripheral surface of the copper pipe 201 toward the radially inner side is formed between the 201 and the valve seat member 202 over the entire circumference of the copper pipe 201. The welded portion 262 joins the copper pipe 201 and the valve seat member 202 to each other. Even in such a configuration, the same effects as those of the above-described embodiment can be obtained.

(Seventh embodiment)
Hereinafter, a pressure regulating valve according to a seventh embodiment of the present invention will be described with reference to FIGS.

  FIG. 15 is a longitudinal sectional view of a pressure regulating valve according to a seventh embodiment of the present invention. 16 is a longitudinal sectional view showing a state before welding of the valve main body, the valve seat member, and the thrust bearing included in the pressure regulating valve of FIG. 17 is a longitudinal sectional view showing a state after welding of the valve main body, the valve seat member, and the thrust bearing included in the pressure regulating valve of FIG. FIG. 18 is a longitudinal sectional view showing a configuration of a modified example of the pressure regulating valve in FIG. 15, and is a longitudinal sectional view showing a state before welding of the valve main body, the valve seat member, and the thrust bearing provided in the pressure regulating valve. is there. FIG. 19 is a longitudinal sectional view showing a configuration of a modified example of the pressure regulating valve in FIG. 15, and is a longitudinal sectional view showing a state after welding of a valve main body, a valve seat member, and a thrust bearing provided in the pressure regulating valve. is there. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in FIG. 15 and indicates the relative positional relationship between the members, and does not indicate the absolute positional relationship.

  As shown in FIG. 15, the pressure adjustment valve 5 includes a valve body 310 as a valve housing, a spring case 315, a valve seat member 320, a valve body portion 330, a thrust bearing 335, an adjustment screw 341, and a pair Spring receivers 342 and 343, a compression spring 344, a bellows 345, a cap member 346, a first welded part 361, and a second welded part 362.

  The valve body 310 is a substantially cylindrical tubular member made of copper. A communication hole 311 that communicates the inside and the outside of the valve body 310 is provided at the center in the longitudinal direction of the valve body 310. A copper inlet joint 314 is inserted into the communication hole 311 and joined by welding. In the valve main body 310, fluid flows in from the communication hole 311 and flows out from the lower opening 312 in the lower part of the figure.

  The spring case 315 is a substantially cylindrical tubular member made of copper and having a smaller outer diameter than the valve body 310. The lower end of the spring case 315 is joined to the upper opening 313 of the valve main body 310 by welding. In the spring case 315, a part of the compression spring 344, which will be described later, in the upper part of the drawing, a spring receiver 343, and an adjusting screw 341 are accommodated.

  The valve seat member 320 is a stainless steel member formed in an annular shape with a valve port 321 opened inside. The outer diameter of the valve seat member 320 is formed to be the same as or slightly smaller than the inner diameter of the valve main body 310. The valve seat member 320 is disposed below the communication hole 311 in the valve body 310 so that the valve port 321 communicates with the lower opening 312 below the valve body in the figure, and is joined to the valve body 310 by welding. Has been. When the disc-shaped valve body 331 is brought into contact with and separated from the valve seat member 320, the communication hole 311 and the lower opening 312 are blocked or communicated to open and close the flow path. The valve seat member 320 is preferably made of austenitic stainless steel.

  The valve body 330 includes a disc-shaped valve body 331 and a shaft 332 to which the valve body 331 is fixedly attached to the lower end 332a in the drawing. The shaft 332 is disposed in the valve body 310 by a thrust bearing 335 so as to be movable in the vertical direction in the drawing.

  The thrust bearing 335 is made of stainless steel, and has a cylindrical bearing body 335a and a flange 335b provided at the upper end of the bearing body 335a in the drawing. The bearing body 335 a has an inner diameter that is substantially the same as the outer diameter of the shaft 332, and an outer diameter that is smaller than the inner diameter of the valve body 310. The flange portion 335b has an outer diameter that is the same as or slightly smaller than the inner diameter of the valve body 310. The thrust bearing 335 is disposed above the communication hole 311 in the valve body 310 in the drawing, and the flange portion 335b is joined to the valve body 310 by welding. The flange portion 335b of the thrust bearing 335 is provided with a communication hole 335c penetrating in the vertical direction in the drawing. A shaft 332 is inserted inside the thrust bearing 335, and the shaft 332 is supported so as to be movable in the vertical direction in the figure. The thrust bearing 335 is preferably made of austenitic stainless steel.

  The adjustment screw 341 is screwed into the spring case 315, and is arranged so as to be movable in the vertical direction in the drawing by rotation. The pair of spring receivers 342 and 343 are disposed to face each other with the compression spring 344 interposed between the adjustment screw 341 and the other end 332b of the shaft 332 in the upper part of the drawing. Thereby, the shaft 332 is pressed by the compression spring 344 from the upper side to the lower side in the drawing. A part of the lower portion of the compression spring 344 in the figure is covered with a bellows 345 that can be expanded and contracted together with the compression spring 344. By rotating the adjusting screw 341 to move it, the compression amount of the compression spring 344 can be changed to adjust the force for pressing the shaft 332. The cap member 346 is fixed and attached so as to close the upper opening 316 of the spring case 315 in the drawing.

  A first welded portion 361 is provided at a welding location between the valve main body 310 and the valve seat member 320. The first welded portion 361 is formed by laser welding between the valve body 310 and the valve seat member 320, copper constituting the valve body 310, stainless steel constituting the valve seat member 320, and nickel (Ni), respectively. It is a part that has been melted and mixed and then solidified. The valve body 310 and the valve seat member 320 are joined to each other through the first welded portion 361.

  A second welded portion 362 is provided at a welding location between the valve main body 310 and the thrust bearing 335. In the second welded portion 362, between the valve body 310 and the thrust bearing 335, copper constituting the valve body 310, stainless steel constituting the thrust bearing 335, and nickel (Ni) are respectively melted by laser welding. It is a solidified part after mixing. The valve body 310 and the thrust bearing 335 are joined to each other via the second welded portion 362.

  Since the 1st welding part 361 and the 2nd welding part 362 are formed including nickel which mixes with stainless steel and copper by welding in the welding part with stainless steel and copper, compared with the structure which welded stainless steel and copper directly. By interposing nickel, stainless steel and copper are mixed and the respective materials are well adapted to each other, so that poor welding can be suppressed, and therefore the bonding strength can be increased.

  In the pressure regulating valve 5, fluid enters the valve body 310 from the communication hole 311 and flows to the lower opening 312 through the valve port 321 in a valve open state in which the valve body 331 is separated from the valve seat member 320. In the pressure regulating valve 5, the inlet pressure (load in the valve opening / closing direction) is canceled by facing the bellows 345 having a substantially the same planar view area as the valve port 321. Therefore, the pressure adjusting valve 5 includes a force obtained by adding the pressing force of the bellows 345 to the pressing force of the compression spring 344, a force obtained by multiplying the outlet pressure (fluid pressure from the lower opening 312 side) by the area of the valve port 321; The valve is opened and closed by the balance. Therefore, when the outlet pressure rises to a predetermined pressure or higher, the valve body 331 is pressed against the valve seat member 320 and seated, and the valve port 321 is closed and the valve is closed. When the outlet pressure drops below a predetermined pressure in this valve closed state, the valve body 331 is separated from the valve seat member 320 and is in the valve open state. Further, the predetermined pressure can be changed by adjusting the pressing force of the compression spring 344 by turning the adjusting screw 341.

  Next, an example of the manufacturing method of the pressure regulating valve 5 described above will be described with reference to FIGS.

(1: Welding process)
As shown in FIG. 16, a valve body 331 is inserted into a valve seat member 320 and a thrust bearing 335 through a shaft 332 attached to one end 332 a, and the valve seat member 320 and the thrust bearing 335 are inserted inside the valve body 310. . The thickness between the inner peripheral surface of the valve main body 310 and the outer peripheral surface of the valve seat member 320 and between the inner peripheral surface of the valve main body 310 and the outer peripheral surface of the thrust bearing 335 is 0.1 mm to 0 mm. A tube material 385 and 386 made of nickel (Ni) of about 5 mm is press-fitted. That is, the valve seat member 320 and the thrust bearing 335 are inserted inside the valve main body 310 and the tube members 385 and 386 are sandwiched between the valve main body 310 and the valve seat member 320 and the thrust bearing 335.

  Next, the laser L so that the inner peripheral surface portion of the valve main body 310, the tube material 385, and the outer peripheral surface portion of the valve seat member 320 are simultaneously melted over the entire circumference along the circumferential direction of the inner peripheral surface of the valve main body 310. After irradiation, the irradiation is stopped. As a result, as shown in FIG. 17, the copper constituting the valve body 310, the nickel constituting the tube member 385, and the stainless steel constituting the valve seat member 320 are respectively melted and mixed, and then solidified. A first weld 361 is formed between 310 and the valve seat member 320 over the entire inner peripheral surface of the valve main body 310. The valve body 310 and the valve seat member 320 are joined to each other by the first welding portion 361.

  Further, the inner peripheral surface portion of the valve main body 310, the tube material 386, and the outer peripheral surface portion of the flange portion 335 b of the thrust bearing 335 are melted simultaneously along the circumferential direction of the inner peripheral surface of the valve main body 310. After irradiating with the laser L, the irradiation is stopped. As a result, as shown in FIG. 16, the copper constituting the valve body 310, the nickel constituting the tube material 385, and the stainless steel constituting the thrust bearing 335 are melted, mixed, and then solidified to form the valve body 310. A second weld 362 is formed between the inner periphery of the valve body 310 and the thrust bearing 335. The valve body 310 and the thrust bearing 335 are joined to each other by the second welded portion 362.

(2: Assembly process)
Next, after the bellows 345 is inserted into the valve body 310 from the upper opening 313 of the valve body 310, the spring case 315 is welded and joined to the upper opening 313 of the valve body 310. Then, one spring receiver 342, compression spring 344, and the other spring receiver 343 are sequentially inserted from the opening 316 of the spring case 315. Thereafter, the adjustment screw 341 is screwed into the spring case 315 to adjust the compression amount of the compression spring 344, and then the cap member 346 is attached so as to close the opening 316 of the spring case 315. Then, the inlet joint 314 is inserted into the communication hole 311 of the valve body 310 and joined by welding. The pressure regulating valve 5 shown in FIG. 15 is completed through the welding process and the assembly process.

  As described above, the pressure regulating valve 5 of the present embodiment includes the copper valve body 310 and the stainless steel valve seat member 320 joined to the inside of the valve body 310. And between the valve main body 310 and the valve seat member 320, the 1st welding part 361 formed by melt | dissolving and solidifying each of stainless steel, copper, and nickel mixed with these by laser welding is provided. The valve body 310 and the valve seat member 320 are joined to each other via the first welded portion 361.

  The pressure regulating valve 5 includes a stainless steel thrust bearing 335 and a copper valve body 310. Between the thrust bearing 335 and the valve body 310, there is provided a second weld portion 362 formed by melting and solidifying each of stainless steel, copper, and nickel mixed by welding by laser welding. The bearing 335 and the valve main body 310 are joined to each other via the second welding portion 362.

  In addition, the pressure regulating valve 5 has a valve member 320 inserted inside the valve body 310 and a tube material 385 made of nickel mixed with stainless steel and copper by welding between the valve body 310 and the valve seat member 320. And a manufacturing process including a welding process in which laser welding is performed between the valve body 310 and the valve seat member 320 so that a first weld 361 is formed by solidifying each of stainless steel, copper, and nickel after melting. Manufactured by the method.

  Further, the pressure regulating valve 5 has a tube material 386 made of nickel mixed by welding with stainless steel and copper between the thrust bearing 335 and the valve body 310, and between the thrust bearing 335 and the valve body 310, It is manufactured by a manufacturing method including a welding process in which laser welding is performed so that a second welded portion 362 is formed by solidifying each of stainless steel, copper, and nickel after melting.

  As described above, according to the present embodiment, in the pressure regulating valve 5, between the copper valve body 310 and the stainless steel valve seat member 320, each of stainless steel, copper, and nickel mixed together by welding. Is formed by melting and solidifying by laser welding, and the valve main body 310 and the valve seat member 320 are joined to each other via the first welding portion 361. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joint strength of the joint location by welding with the valve body 310 made of copper and the valve seat member 320 made of stainless steel can be effectively ensured by the first welding portion 361 formed by laser welding.

  Further, in the pressure regulating valve 5, each of stainless steel, copper, and nickel mixed by welding is melted and solidified by laser welding between the stainless steel thrust bearing 335 and the copper valve body 310. The second welded portion 362 is provided, and the thrust bearing 335 and the valve body 310 are joined to each other via the second welded portion 362. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by the welding of the thrust bearing 335 and the valve main body 310 can be effectively ensured by the second welding portion 362 formed by laser welding.

  Conventionally, in such a pressure regulating valve, a groove is provided on the outer peripheral surfaces of the valve seat member and the thrust bearing over the entire circumference, and the valve body is reduced in diameter along the groove to be caulked. Although the valve seat member and the thrust bearing are fixed, in such a configuration, the caulking portion of the valve body may be fatigued due to the influence of vibration or the like, and due to variations in caulking, the valve body and the valve seat There was a fear that a sufficient sealing between the members could not be secured. In the present embodiment, by providing the first welded portion 361 and the second welded portion 362, fatigue of the caulking portion of the valve body can be eliminated and sufficient sealing between the valve body and the valve seat member is achieved. Can be secured.

  In addition, the pressure regulating valve 5 has a valve member 320 inserted inside the valve body 310 and a tube material 385 made of nickel mixed with stainless steel and copper by welding between the valve body 310 and the valve seat member 320. Laser welding is then performed between the copper valve body 310 and the stainless steel valve seat member 320 so that a first weld 361 is formed by solidifying each of stainless steel, copper, and nickel after melting. It is manufactured by a manufacturing method including a welding process. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joint strength of the joint location by welding with the valve body 310 made of copper and the valve seat member 320 made of stainless steel can be effectively ensured by the first welding portion 361 formed by laser welding.

  Further, the pressure regulating valve 5 has a tube material 386 made of nickel mixed by welding with stainless steel and copper between the thrust bearing 335 and the valve main body 310, and the stainless steel thrust bearing 335 and the copper valve main body 310. In between, it manufactures with the manufacturing method including the welding process which performs laser welding so that the 2nd welding part 362 formed by each of stainless steel, copper, and nickel solidifying after fusion | melting may be formed. Since stainless steel and copper are mixed with each other by interposing nickel mixed with stainless steel and copper by welding compared to a configuration in which stainless steel and copper are directly welded, stainless steel and copper are mixed. It is possible to suppress solidification in a separated state without matching. Therefore, poor welding such as internal cracks that occur when stainless steel and copper are not mixed can be suppressed. Thereby, the joining strength of the joining location by the welding of the thrust bearing 335 and the valve main body 310 can be effectively ensured by the second welding portion 362 formed by laser welding.

  In the present embodiment, in the welding process, the first welded part 361 and the second welded part 362 are formed by irradiating the laser L from the inside of the valve main body 310. However, the present invention is not limited to this. . For example, it is good also as a structure which irradiated the laser L from the outer side of the valve main body 310, and formed the 1st welding part 363 and the 2nd welding part 364 in the welding process.

  Specifically, in the welding process, as shown in FIG. 18, the outer peripheral surface portions of the valve main body 310, the tube material 385, and the valve seat member 320 are formed over the entire circumference along the circumferential direction of the outer peripheral surface of the valve main body 310. After irradiating the laser L so as to melt at the same time, the irradiation is stopped. Accordingly, as shown in FIG. 19, the copper constituting the valve body 310, the nickel constituting the tube member 385, and the stainless steel constituting the valve seat member 320 are respectively melted and mixed, and then solidified. A first weld 363 extending from the outer peripheral surface of the valve body 310 toward the radially inner side is formed between the valve body 310 and the valve seat member 320 over the entire circumference of the valve body 310. The valve body 310 and the valve seat member 320 are joined to each other by the first welding portion 363.

  Further, in the welding process, as shown in FIG. 18, the outer peripheral surface portion of the valve body 310, the tube material 385, and the flange portion 335 b of the thrust bearing 335 extends along the entire circumferential direction of the outer peripheral surface of the valve main body 310. After irradiating the laser L so as to melt at the same time, the irradiation is stopped. Accordingly, as shown in FIG. 19, the copper constituting the valve body 310, the nickel constituting the tube material 385, and the stainless steel constituting the thrust bearing 335 are respectively melted, mixed, and then solidified to be solidified. And a thrust bearing 335, a second weld 364 extending from the outer peripheral surface of the valve body 310 toward the radially inner side is formed over the entire circumference of the valve body 310. The valve body 310 and the thrust bearing 335 are joined to each other by the second welded portion 364. Even in such a configuration, the same effects as those of the above-described embodiment can be obtained.

  Although the present invention has been described with reference to the preferred embodiments, the valve device and the manufacturing method thereof of the present invention are not limited to the configurations of these embodiments.

  For example, in each of the above-described embodiments, the tube material and the ring material, which are metal materials sandwiched between the valve housing and the valve seat member, and the joints, are made of nickel as a material. It is not limited. As long as it does not contradict the objective of this invention, the material which comprises such a metal material should just be a metal mixed with stainless steel and copper by welding, and the kind of metal used as the material is arbitrary. As a material constituting the metal material, it is preferable to have one metal selected from nickel, lithium, bismuth, gold, and platinum as a main component (including more than 50% by weight). By using it, weldability can be improved and poor welding can be suppressed. Alternatively, phosphor copper brazing, silver brazing, or nickel brazing may be used as a material constituting the metal material. Phosphor copper brazing (JISZ3264) is a brazing material obtained by adding about 5% to 8% phosphorus to copper. Silver brazing (JISZ3261) is a brazing material containing silver, copper, and zinc in a high ratio, and cadmium, tin, nickel, and the like may be added depending on applications. Nickel brazing (JISZ3265) is a brazing material containing nickel as a main component, to which chromium, boron, silicon, or the like is added.

  Moreover, in each embodiment mentioned above, although the 1st coupling which is a piping member, the 2nd coupling, etc. were comprised using pure copper as a material, it is not limited to this. As a material of such a piping member, as long as it does not contradict the object of the present invention, copper or a copper alloy containing copper as a main component (including more than 50% by weight) may be used. The material of the piping member is particularly preferably one copper (including a copper alloy) selected from pure copper, oxygen-free copper, tough pitch copper, phosphorus deoxidized copper and aluminum bronze.

  Moreover, in each embodiment mentioned above, the nickel plating layer or the nickel-type member melt-adhered to the location where the valve housing or the valve seat member is joined by welding on the outer peripheral surfaces of the first joint and the second joint. An adhesion part may be provided. By doing in this way, the weldability of a valve housing and a valve seat member, and each joint can further be improved.

  The first to seventh embodiments described above are merely representative forms of the present invention, and the present invention is not limited to the embodiments. Although the motorized valve, the throttle valve device (electromagnetic valve), the flow path switching valve (four-way valve), the check valve, and the pressure adjustment valve described above are shown as examples of the embodiment of the present invention, the present invention is various other types. It can also be applied to other valve devices. That is, the present invention is applicable to any valve device having a configuration in which a stainless member and a copper member are fixed by welding. That is, those skilled in the art can implement various modifications in accordance with conventionally known knowledge without departing from the scope of the present invention. Of course, such modifications are also included in the scope of the present invention as long as the configuration of the valve device and the manufacturing method thereof of the present invention is provided.

(First to third embodiments: FIGS. 1 to 6)
1, 1A, 1B Electric valve (valve device)
10 valve body 10A valve chamber 11 valve housing (stainless steel member)
11A 1st communicating hole 11B 2nd communicating hole 12 Valve seat member (member made from stainless steel)
17 First joint (piping member, copper member)
18 Second joint (piping member, copper member)
18a Flange part 20 Valve body part 30 Stepping motor 51 1st welding part (welding part)
52, 52A, 52B Second welded portion (welded portion)
55 Tube material (metal material)
56 Tube material (metal material)
56A, 56B Ring material (metal material)
L laser (fourth embodiment: FIGS. 7 and 8)
2 Throttle valve device (valve device)
60 Valve body 60A Valve chamber 61 Valve housing (stainless steel member)
61A 1st communicating hole 61B 2nd communicating hole 62 Valve seat member 67 1st coupling (piping member, copper member)
68 Second joint (piping member, copper member)
70 Valve body part 81 1st welding part (welding part)
82 Second weld (weld)
85 Tube material (metal material)
86 Tube material (metal material)
L laser (fifth embodiment: FIGS. 9 and 10)
3 Channel switching valve (valve device)
101 Valve body (valve housing, stainless steel member)
101A Main valve chamber 101B, 101C Sub valve chamber 101C Sub valve chamber 101a Cylindrical portion 101b Cap portion 101c Communication hole 102 Piston 103 Connecting member 104 Valve seat member (stainless steel member)
104a First communication hole 104b Second communication hole 104c Third communication hole 105 Valve body 121 First joint (piping member, copper member)
122 Second joint (piping member, copper member)
123 Third joint (piping member, copper member)
124 Fourth joint (piping member, copper member)
161 First welded portion 162 Second welded portion 163 Third welded portion 164 Fourth welded portion 171 First tube material (metal material)
172 Second tube material (metal material)
173 3rd tube material (metal material)
174 Fourth tube material (metal material)
L laser (sixth embodiment: FIGS. 11 to 14)
4 Check valve (valve device)
201 Copper pipe (valve housing, copper member)
202 Valve seat member (stainless steel member)
202a Valve port 203 Holder member 203a Stopper piece 204 Valve body portion 261, 262 Welded portion 285 Tube material (metal material)
L laser (seventh embodiment: FIGS. 15 to 19)
5 Pressure regulating valve (valve device)
310 Valve body (valve housing, copper member)
315 Spring case 320 Valve seat member (stainless steel member)
330 Valve body 335 Thrust bearing (stainless steel member)
341 Adjustment screw 342, 343 Spring receiver 344 Compression spring 345 Bellows 346 Cap member 361, 363 First welded portion (welded portion)
362, 364 Second welded portion (welded portion)
385, 386 Tube material (metal material)
L Laser

Claims (2)

Manufacture of a valve device comprising a stainless steel valve housing provided with a valve chamber inside, a copper piping member joined to the valve housing, and a stainless steel valve seat member joined to the valve housing A method,
The valve seat member and one end portion of the piping member are arranged side by side in the axial direction of the communication hole in a communication hole communicating with the inside and the outside of the valve housing formed in the valve housing, and the valve seat member and the A metal material made of a metal mixed by welding with stainless steel and copper is sandwiched between the pipe member, and each of stainless steel, copper, and the metal is interposed between the valve housing, the pipe member, and the valve seat member. A method for manufacturing a valve device, comprising a welding step of performing laser welding along a circumferential direction of the communication hole so that a welded portion solidified after melting is formed. A valve device manufacturing method comprising: a copper valve housing; and a stainless steel valve seat member joined to the inside of the valve housing,
Inserting the valve seat member inside the valve housing and sandwiching a metal material made of metal mixed with stainless steel and copper by welding between the valve housing and the valve seat member, and the valve housing and the valve A method for manufacturing a valve device, comprising: a welding step in which laser welding is performed between a seat member and a welded portion formed by solidification of stainless steel, copper, and the metal after melting.

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