JP2014029211A - Method of manufacturing flow passage selector valve, and flow passage selector valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a time for a heating process to be performed before brazing a valve housing of a flow passage selector valve to a first type joint pipe and a second type joint pipe.SOLUTION: Ends of first type joint pipes 3a-3c are inserted and assembled to insertion holes 11a-11c of a valve housing 1 and insertion holes 21a-21c of a valve seat member 2. An end of a second type joint pipe 3d is inserted and assembled to an insertion hole 11d of the valve housing 1. Welding is performed in such a manner that a melting solidification layer A1 is formed by irradiating a laser beam B1 from the outside of the valve housing 1 at corresponding positions of the first type joint pipes 3a-3c. Welding is performed in such a manner that a melting solidification layer A2 is formed by irradiating a laser beam B2 from the outside of the valve housing 1 at a corresponding position of the second type joint pipe 3d. A temporarily assembled body assembly 10 is heated and brazed without using an implement for assembling having a large heat capacity.

Description

  The present invention relates to a manufacturing method of a flow path switching valve for manufacturing a flow path switching valve that switches a flow path of a refrigerant in a refrigeration, refrigeration, air conditioning, hot water supply cycle, and the like, and a flow path switching valve manufactured by the manufacturing method.

  Conventionally, as a flow path switching valve used in a refrigeration cycle, for example, there is one disclosed in Japanese Patent Application Laid-Open No. 63-219969 (Patent Document 1). As a flow path switching valve similar to this Patent Document 1, there is one shown in FIG. In this flow path switching valve, a valve seat member 2 is mounted in a cylindrical cylinder-shaped valve housing 1, and three joint pipes 3a are connected to switching ports 2a, 2b, 2c formed in the valve seat member 2, respectively. , 3b, 3c are attached to the side surface of the valve housing 1. A single joint pipe 3d is attached to the valve housing 1 so as to face the valve seat member 2. The valve housing 1, the joint pipes 3a to 3d, and the valve seat member 2 are joined by brazing to form a main body assembly 10. The valve housing 1 and the valve seat member 2 are made of brass (made of brass), and the joint pipes 3a to 3d are made of copper. Then, after the body assembly 10 is formed, a slide valve and a piston (not shown) are accommodated in the valve housing 1, and caps 4 a and 4 b are fixed to both ends of the valve housing 1.

  4A and 4B are diagrams showing a jig used for temporarily assembling and brazing the respective parts of the main body assembly 10 of the flow path switching valve. FIG. 4A is a plan view, and FIG. 4B is a side view. FIG. 4C is a front view. FIG. 4 (B) shows a state in which the respective parts of the main assembly 10 before brazing are temporarily assembled by an alternate long and short dash line.

  This jig 20 has a column b standing on the frame a, a valve seat receiver c extending horizontally in the middle of the column b, and an upper collar d extending horizontally above the column b. ing. Three pressing rods e are vertically attached to the upper arm d, and the pressing rods e can move up and down and are urged downward (on the gantry a side). The valve seat receiver c is formed of a cylindrical member that can be inserted into the valve housing 1 and its upper surface is D-cut. A joint pipe receiver f is provided at the center of the gantry a.

  As shown in FIG. 4B, each part constituting the main assembly 10 is assembled to the jig 20. First, with the valve seat member 2 inserted into the valve housing 1, the valve seat member 2 side is faced up, and the valve housing 1 is covered with the valve seat receiver c, and the valve seat member 2 is cut by the D cut surface of the valve seat receiver c To receive. One end of the joint pipe 3d is fitted to the upper end of the joint pipe receiver f, and the other end of the joint pipe 3d is fitted into an insertion hole (not shown) formed in the valve housing 1 to assemble the joint pipe 3d. Further, one end of each of the joint pipes 3a to 3c is assembled so as to be fitted to the valve seat member 2 through an insertion hole (not shown) formed on the upper side of the valve housing 1, and a press rod is attached to the other end of the joint pipes 3a to 3c. Insert e1-e3. Thereby, the main assembly 10 including the valve housing 1, the valve seat member 2, and the joint pipes 3 a to 3 d is temporarily assembled to the jig 20.

  Next, since it is necessary to heat each part in order to braze, the main assembly 10 temporarily assembled as described above is accommodated together with the jig 20 in, for example, a furnace, and the whole is heated. And it heats to required temperature and brazes the assembly | attachment part of the valve housing 1 and the joint pipes 3a-3d. The valve seat member 2 is brazed to the inner surface of the valve housing 1 through the insertion hole of the valve housing 1 by brazing the joint pipes 3a to 3c.

  Patent Document 1 discloses that a solenoid tube pipe (13) is attached to a valve body (12) by resistance welding or laser welding, but a plurality of joint pipes are attached to the valve body or the valve body. There is no laser welding, and it is common to join by brazing as described above.

Japanese Unexamined Patent Publication No. 63-219969

  In the conventional brazing operation as described above, the entire body assembly 10 must be heated in a state where each part of the main assembly 10 is temporarily assembled to the jig 20. That is, at the time of heating, it is necessary to heat the jig 20 in addition to the components of the main assembly 10. However, the valve housing 1 and the joint pipes 3a to 3d are relatively thin members, but the jig has a large mass and volume and a large heat capacity. For this reason, the amount of heat required to heat the jig 20 is larger than the amount of heat required to heat the main assembly 10. Therefore, there is a problem that heating and cooling take time and work efficiency is poor. In addition, the defective rate of the brazing process is affected by insufficient heating. Furthermore, heating requires a large amount of heat, and there is room for improvement in terms of energy saving.

  The present invention relates to a manufacturing method for manufacturing a flow path switching valve by brazing a plurality of joint pipes to a valve housing, shortening the heating process before brazing, improving work efficiency, improving yield, and saving energy. The problem is to plan.

  According to a first aspect of the present invention, there is provided a method of manufacturing a flow path switching valve, wherein a valve seat member having a valve port formed therein is disposed in a cylindrical valve housing and is electrically connected to the valve port of the valve seat member. The pipe is inserted into an insertion hole formed in the side surface of the valve housing, and the first type joint pipe is attached to the valve housing by brazing at the joint portion of the insertion hole. In the method for manufacturing a path switching valve, the end of the first type joint pipe is inserted into an insertion hole formed to be electrically connected to the valve port of the valve seat member through the insertion hole of the valve housing. Forming a melt-solidified layer that penetrates the valve seat member from the valve housing to reach an end of the first-type joint tube by welding, and forms the melt-solidified layer by welding to form the first-type joint tube and the A valve seat member and the valve housing Temporarily assembled to constitute a body assembly, and heating the temporarily assembled to the body assembly, characterized in that the joint portion of the insertion hole and to be brazed.

  The flow path switching valve according to claim 2 is a flow path switching valve manufactured by the manufacturing method of the flow path switching valve according to claim 1, wherein the position of the root of the first type joint pipe on the outer surface of the valve housing is provided. Further, the melt-solidified layer is formed so as to be exposed.

  According to the method for manufacturing a flow path switching valve of claim 1, the valve housing constituting the main body assembly of the flow path switching valve and the first type joint pipe are temporarily assembled by welding, and the temporarily assembled main body assembly is heated. Because it is brazed, it is not necessary to heat jigs with large heat capacity, etc., the heating process before brazing can be shortened, the work efficiency can be improved and the yield can be improved, and further energy saving can be achieved. it can.

  According to the flow path switching valve of the second aspect, a product with a high yield can be obtained by the effect of the first aspect.

It is a figure which shows the main body assembly of the temporarily assembled state in the manufacturing method of the flow-path switching valve of embodiment of this invention. It is a side view of the flow-path switching valve manufactured with the manufacturing method of embodiment of this invention. It is a figure which shows an example of the jig | tool used for brazing of a main body assembly in the manufacturing method of embodiment of this invention. It is a figure which shows the jig | tool used in order to assemble and braze each part of the main body assembly of a flow-path switching valve in the conventional manufacturing method. It is a figure which shows an example of the conventional flow-path switching valve.

  Next, an embodiment of a flow path switching valve and a method for manufacturing the same according to the present invention will be described with reference to the drawings. FIG. 1 is a view showing a main assembly 10 in a temporarily assembled state in the method for manufacturing a flow path switching valve of the embodiment, and FIG. 1 (B) is an AA enlarged sectional view of FIG. 1 (A). In addition, the same code | symbol is attached | subjected to the element similar to FIG. The main assembly 10 shown in FIG. 1 is assembled to the jig 20 in the same manner as in FIG. 4, and then the laser beam is irradiated to the valve housing 1, so that the first type joint pipes 3 a to 3 c and the second type The joint pipe 3d is temporarily assembled by welding.

  The laser welding in the embodiment is performed by Yb (ytterbium) fiber laser welding. Since the fiber laser oscillates and outputs a laser, the fiber laser has good beam quality, a laser beam with a small beam diameter can be obtained, and thin welding can be performed. For example, the beam diameter can be about 0.2 mm. Thereby, it is possible to weld deeply and sharply without increasing the welding width at a necessary portion of the valve housing 1.

  The valve seat member 2 is formed with insertion holes 21a, 21b, and 21c that respectively conduct to the switching ports 2a, 2b, and 2c corresponding to the first type joint pipes 3a, 3b, and 3c. Further, the valve housing 1 is formed with insertion holes 11a, 11b, and 11c that are respectively connected to the valve seat member 2 insertion holes 21a, 21b, and 21c, and the second type joint pipe is provided on the side facing the valve seat member 2. An insertion hole 11d is formed corresponding to 3d. In the assembled state, the end portions of the first type joint pipes 3a, 3b, 3c are inserted into the insertion holes 21a, 21b, 21c through the insertion holes 11a, 11b, 11c, respectively. Further, the end of the second type joint pipe 3d is inserted through the insertion hole 11d.

  As shown in FIG. 1B, from the outside of the valve housing 1, the first type joint pipe 3b (3a, 3c) and the valve housing 1 are attached to the first type joint pipe 3b (3a, 3c). The laser beam B1 is irradiated obliquely. At the time of welding with this laser beam, a molten hole is formed from the outside of the valve housing 1 toward the valve seat member 2 and the joint pipe 3b by irradiation with laser light. Then, the melt flows into the molten hole and is cooled and solidified after the laser beam is stopped, so that the melt-solidified layer A1 is formed. The melt-solidified layer A1 is formed so as to penetrate the valve seat member 2 from the valve housing 1 and reach the end of the first type joint pipe 3b. In FIG. 1B, the first type joint pipe 3b is shown, but the first type joint pipes 3a and 3c are the same.

  Further, the laser beam B2 is irradiated from the outside of the valve housing 1 at a right angle to the second type joint pipe 3d at the attachment position of the second type joint pipe 3d and the valve housing 1. Similarly, a molten hole is formed from the outside of the valve housing 1 toward the second type joint pipe 3d by laser light irradiation, and then cooled and solidified after the laser is stopped to form a melt-solidified layer A2. The melt-solidified layer A2 is formed so as to reach the end of the second type joint pipe 3d from the valve housing 1.

  In this manner, the valve housing 1, the valve seat member 2, and the first type joint pipes 3a to 3c are partially welded by the melt-solidified layer A1. Further, the valve housing 1 and the second type joint pipe 3d are partially welded by the melt-solidified layer A2. Thereby, the first type, second type joint pipes 3a to 3d and the valve seat member 2 are temporarily fixed to the valve housing 1, and the temporary assembly of the main body assembly 10 is completed.

  Thereafter, the main assembly 10 that has been temporarily assembled is removed from the jig 20, the main assembly 10 is attached to the jig 30 shown in FIG. 3, and the whole is heated and brazed. This jig 30 has the same configuration as the jig 20 shown in FIG. 4 with the seat c, the pressing bar e1, and the pressing bar e3 removed. In other words, since the heat capacity of the removed member is not affected during brazing, the amount of heat required for heating is reduced as compared with the conventional brazing method. Further, it can be heated immediately, and the time required for heating can be shortened. Further, in the jig 30 shown in FIG. 3, the amount of heat required for heating is further reduced by replacing the gantry a, the column b, the upper arm d, and the joint pipe receiver f and the presser bar e2 with a shape having a small heat capacity. ,It is valid.

  FIG. 2 is a side view of the flow path switching valve according to the embodiment manufactured by the above manufacturing method. FIG. 2 (A) shows the first embodiment and FIG. 2 (B) shows the second embodiment. In the first form of FIG. 1 (A), when the main assembly 10 is assembled, the laser beam B1 is linearly moved in the longitudinal direction of the valve housing 1 and welding is performed. From the base position to the base position of the first type joint pipe 3c, a linear melt-solidified layer A1 is exposed and formed. Further, welding is performed by linearly moving the laser beam B2 in the longitudinal direction of the valve housing 1 at the position of the second type joint pipe 3d, and the straight line is formed at the base of the second type joint pipe 3d. The melt-solidified layer A2 is exposed and formed.

  In the second form of FIG. 1B, when the main assembly 10 is assembled, the valve housing 1 is irradiated with a laser beam B1 in a spot shape at positions corresponding to the first type joint pipes 3a to 3c. The laser beam B2 is spot-irradiated and welded at a position corresponding to the second type joint pipe 3d. A point-like melted and solidified layer A1 is exposed and formed at the base of the first type joint pipes 3a to 3c. Further, a spot-like melted and solidified layer A2 is exposed and formed at the base of the second type joint pipe 3d. In both the first form and the second form, the joints between the insertion holes 11a to 11d of the valve housing 1 and the first type and second type joint pipes 3a to 3d are brazed. Further, a slide valve and a piston (not shown) are accommodated in the valve housing 1, and caps 4 a and 4 b are fixed to both ends of the valve housing 1.

  The flow path switching valve of the above embodiment is an example of a four-way switching valve having four joint pipes. However, the present invention is not limited to the flow path according to another embodiment as long as a plurality of joint pipes are brazed to the valve housing. It can also be applied to a switching valve.

DESCRIPTION OF SYMBOLS 10 Main body assembly 30 Jig 1 Valve housing 2 Valve seat member 3a-3c 1st type joint pipe 3d 2nd type joint pipe 11a-11d Insertion hole 21a-21c Insertion hole B1, B2 Laser beam A1, A2 Melting | solidification layer

The valve seat member 2 is formed with insertion holes 21a, 21b, and 21c that respectively conduct to the switching ports 2a, 2b, and 2c corresponding to the first type joint pipes 3a, 3b, and 3c. Further, the valve housing 1 is formed with insertion holes 11a, 11b, and 11c that are respectively connected to the insertion holes 21a, 21b, and 21c of the valve seat member 2, and a second type joint on the side facing the valve seat member 2 An insertion hole 11d is formed corresponding to the tube 3d. In the assembled state, the end portions of the first type joint pipes 3a, 3b, 3c are inserted into the insertion holes 21a, 21b, 21c through the insertion holes 11a, 11b, 11c, respectively. Further, the end of the second type joint pipe 3d is inserted through the insertion hole 11d.

Thereafter, the main assembly 10 that has been temporarily assembled is removed from the jig 20, the main assembly 10 is attached to the jig 30 shown in FIG. 3, and the whole is heated and brazed. This jig 30 has the same form as the jig 20 shown in FIG. 4 except that the valve seat receiver c, the presser bar e1, and the presser bar e3 are removed. In other words, since the heat capacity of the removed member is not affected during brazing, the amount of heat required for heating is reduced as compared with the conventional brazing method. Further, it can be heated immediately, and the time required for heating can be shortened. Further, in the jig 30 shown in FIG. 3, the amount of heat required for heating is further reduced by replacing the gantry a, the column b, the upper arm d, and the joint pipe receiver f and the presser bar e2 with a shape having a small heat capacity. ,It is valid.

Claims (2)

A valve seat member in which a valve port is formed is disposed in a cylindrical valve housing, and a first type joint pipe that is connected to the valve port of the valve seat member is inserted in a side surface of the valve housing. In the method of manufacturing the flow path switching valve, the first type joint pipe is attached to the valve housing by being inserted into the hole and brazed at the joint portion of the insertion hole.
The end portion of the first type joint pipe is inserted into an insertion hole formed so as to be electrically connected to the valve port of the valve seat member through the insertion hole of the valve housing, and the valve housing and the valve are welded. Forming a melt-solidified layer that penetrates the seat member and reaches the end of the first type joint pipe,
The first type joint pipe and the valve seat member are temporarily assembled to the valve housing by welding to form the melt-solidified layer to form a main body assembly, and the temporarily assembled main body assembly is heated, and the insertion hole A method for manufacturing a flow path switching valve, characterized in that the joint portion of the flow path is brazed. A flow path switching valve manufactured by the flow path switching valve manufacturing method according to claim 1,
The flow path switching valve, wherein the melt-solidified layer is exposed at a base position of the first type joint pipe on the outer surface of the valve housing.

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