JP2022116694A - Plate type refrigerant pipe, air conditioner, and method for manufacturing plate type refrigerant pipe - Google Patents

Abstract

To provide a plate type refrigerant pipe which can join other refrigerant pipe to a connection part while suppressing an adverse effect on junction of plates.SOLUTION: A plate type refrigerant pipe includes a first plate 21, a second plate 22 laminated on the first plate 21, a first brazing material B1 joining the first plate 21 and the second plate 22, a first connection part 51 that is provided on the first plate 21 and connects other refrigerant pipes 101 and 102, and a second brazing material B2 joining the other refrigerant pipes 101 and 102 to the first connection part 51, wherein a melting point of the first brazing material B1 is higher than a melting point of the second brazing material B2.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present disclosure relates to a plate-type refrigerant pipe, an air conditioner, and a method for manufacturing the plate-type refrigerant pipe.

2. Description of the Related Art In a refrigerating apparatus having a refrigerant circuit that performs a vapor compression refrigeration cycle operation, it is known that a plurality of refrigerant pipes through which refrigerant flows are integrated into one to reduce the size of the refrigerant circuit. For example, Patent Literature 1 discloses a laminated channel substrate having a plurality of laminated metal plates and a coolant channel therein. A channel port member for connecting other refrigerant pipes is attached to the laminated channel substrate with bolts and nuts. The plurality of metal plates are joined with brazing material.

JP-A-2000-274988

In the laminated channel substrate described in Patent Document 1, when another refrigerant pipe is joined to the channel port member by brazing, the heat of the burner that heats the channel port member is transmitted to the stacked metal plates, and the metal plates are joined together. It may melt the brazing filler metal and adversely affect the joining of the metal plates. In particular, the laminated channel substrate has a block shape by laminating a plurality of metal plates, and thus has a larger heat capacity and a larger surface area than the channel port member. Therefore, the heat of the burner is likely to be transmitted to the laminated flow path substrate by heat conduction and radiation, and the possibility of adversely affecting the connection between the metal plates increases.

The present disclosure provides a method for manufacturing a plate-type refrigerant pipe, an air conditioner, and a plate-type refrigerant pipe that can connect another refrigerant pipe to a connection part while suppressing adverse effects on the connection between plates. intended to

(1) The plate-type refrigerant pipe of the present disclosure is
a first plate;
a second plate laminated on the first plate;
a first brazing material that joins the first plate and the second plate;
a first connection portion provided on the first plate for connecting another refrigerant pipe;
a second brazing material that joins the other refrigerant pipe to the first connecting portion;
The melting point of the first brazing material is higher than the melting point of the second brazing material.

According to this configuration, when joining the other refrigerant pipe to the first connecting portion with the second brazing material, the second brazing material is applied at a temperature lower than the melting point of the first brazing material and higher than the melting point of the second brazing material. By heating, another refrigerant pipe can be joined to the first connecting portion while suppressing adverse effects on the joining of the plates by the first brazing material.

(2) Preferably, in the plate-type refrigerant pipe of (1) above, the first connecting portion is a pipe separate from the first plate,
further comprising a third brazing material that joins the first connecting portion and the first plate;
The melting point of the third brazing material is higher than the melting point of the second brazing material.
According to this configuration, when the other refrigerant pipe is brazed to the first connecting portion with the second brazing material, the second brazing material is heated at a temperature lower than the melting point of the third brazing material and higher than the melting point of the second brazing material. By heating the third brazing material, another refrigerant pipe can be joined to the first connection part while suppressing adverse effects on the joining of the first connection part and the first plate by the third brazing material.

(3) Preferably, in the plate-type refrigerant pipe of (2) above, the melting point of the first brazing material and the melting point of the third brazing material are the same.
According to this configuration, when the bonding of the first plate and the second plate and the bonding of the first plate and the first connecting portion are simultaneously performed by, for example, furnace brazing, temperature control in the furnace is easy. Therefore, manufacturing can be easily performed.

(4) Preferably, in the plate-type refrigerant pipe of (2) or (3) above, the first plate has a tubular second connection portion projecting in the stacking direction of the plurality of plates,
The first connection portion is joined to the second connection portion.
With this configuration, it is possible to secure the bonding length between the first connecting portion and the first plate, and to firmly bond the two.

(5) Preferably, in the plate-type refrigerant pipe according to any one of (2) to (4) above, the first connecting portion is made of a material containing copper as a main component.
In general, since copper or a copper alloy is often used for refrigerant pipes, the first connection portion is formed of a material containing copper as a main component, so that the connection between the first connection portion and other refrigerant pipes is facilitated. An inexpensive brazing material can be used.

(6) In the plate-type refrigerant pipe of (1) above, the first connecting portion may be provided integrally with the first plate.
With such a configuration, it is possible to reduce the number of component parts of the plate-type refrigerant pipe.

(7) Preferably, in the plate-type refrigerant pipe according to any one of (1) to (6) above, the first plate and the second plate are made of stainless steel.
According to this configuration, since stainless steel is cheaper than copper, the manufacturing cost of the plate-type refrigerant pipe can be reduced.

(8) The air conditioner of the present disclosure is
It has any one of the plate-type refrigerant pipes (1) to (7) and another refrigerant pipe connected to the first connecting portion of the plate-type refrigerant pipe.

(9) The method for manufacturing a plate-type refrigerant pipe of the present disclosure includes:
A first brazing material is arranged between a first plate and a second plate laminated on the first plate, and between the first plate and a joint pipe for connecting another refrigerant pipe. a first step of disposing a third brazing material and furnace brazing the first plate, the second plate, and the joint pipe; and applying the first brazing material to the joint pipe after the first step. and a second step of burner brazing another refrigerant pipe with a second brazing material having a melting point lower than that of the third brazing material.

In the manufacturing method described above, the joint pipe is prevented from adversely affecting the joining of the first plate and the second plate by the first brazing filler metal and the joining of the first plate and the joint pipe by the third brazing filler metal. Another refrigerant pipe can be joined to the second brazing material.

1 is a perspective view of a plate-type refrigerant pipe according to a first embodiment of the present disclosure, viewed from one side; FIG. FIG. 4 is a perspective view of the plate-type refrigerant pipe according to the first embodiment of the present disclosure, viewed from the other side; It is a cross-sectional view of part of the plate-type refrigerant pipe. FIG. 4 is an enlarged cross-sectional view showing a connecting portion of a plate-type refrigerant pipe; It is sectional drawing which expands and shows the connection part of the plate-type refrigerant|coolant piping which concerns on 2nd Embodiment. It is sectional drawing which expands and shows the connection part of the plate-type refrigerant|coolant piping which concerns on 3rd Embodiment. It is sectional drawing which expands and shows the connection part of the plate-type refrigerant|coolant piping which concerns on 4th Embodiment. It is sectional drawing which expands and shows the connection part of the plate-type refrigerant|coolant piping which concerns on 5th Embodiment. FIG. 11 is an enlarged cross-sectional view showing a connecting portion of a plate-type refrigerant pipe according to a sixth embodiment; FIG. 11 is a cross-sectional view of a portion of a plate-type refrigerant pipe according to a seventh embodiment;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
[First embodiment]
FIG. 1 is a perspective view of a plate-type refrigerant pipe according to a first embodiment of the present disclosure, viewed from one side. FIG. 2 is a perspective view of the plate-type refrigerant pipe according to the first embodiment of the present disclosure, viewed from the other side. FIG. 3 is a cross-sectional view of part of the plate-type refrigerant pipe.

The plate-type refrigerant pipe 10 of the present embodiment is applied, for example, to an air conditioner provided with a refrigerant circuit that performs vapor compression refrigeration cycle operation. Equipment such as a four-way switching valve, a solenoid valve, a compressor, an accumulator, an oil separator, and the like, which constitute a refrigeration circuit, are connected to the plate-type refrigerant pipe 10 . For example, functional parts such as a four-way switching valve 61 and an electromagnetic valve 62 are connected to one surface of the plate-type refrigerant pipe 10, as shown in FIG. The plate-type refrigerant pipe 10 in the present embodiment is fixed to, for example, a bottom plate of an air conditioner in an upright posture (a posture in which the plate surface faces the vertical direction) via a support base 63 .

As shown in FIG. 3 , the plate-type refrigerant pipe 10 has a pipe main body 11 , a first joint pipe 12 and a second joint pipe 13 . The pipe main body 11 has a plurality of plates 21, 22, 23. As shown in FIG. A plurality of plates 21, 22, 23 are stacked and joined together. The plates 21, 22, 23 of this embodiment are made of stainless steel. A coolant channel 15 is formed inside the pipe main body 11 . Hereinafter, the direction in which the plurality of plates 21, 22, and 23 are stacked is also referred to as the first direction. The direction along the plate surfaces of the plates 21, 22, 23 (the direction orthogonal to the first direction) is also called the second direction.

The plurality of plates 21 , 22 , 23 has a first plate 21 , a second plate 22 stacked on the first plate 21 , and a third plate 23 stacked on the second plate 22 . The plates 21, 22, 23 adjacent to each other are joined by brazing.

The first plates 21 are arranged at both ends of the pipe main body 11 in the first direction. The first plate 21 is formed thinner than the other second and third plates 22,23. The first plate 21 is provided with a connection tube (second connection portion) 21b that protrudes outward from the pipe main body 11 in the first direction. The connection cylinder 21b is formed in a cylindrical shape. The tube axis of the connection tube 21b is parallel to the first direction. The inside of the connecting tube 21b forms a first opening 21a. The first opening 21 a is a circular hole penetrating the first plate 21 . Three first openings 21a are shown in the first plate 21 shown in FIG. The first opening 21a and the connecting tube 21b are formed by burring the first plate 21. As shown in FIG.

The second plate 22 is positioned second from both ends of the pipe main body 11 in the first direction. The second plate 22 is formed thicker than the first plate 21 . A second opening 22a is formed in the second plate 22 . The second opening 22 a is a circular hole penetrating the second plate 22 . Three second openings 22a are shown in the first plate 21 shown in FIG. The second opening 22 a communicates with the first opening 21 a of the first plate 21 . The first opening 21a and the second opening 22a have the same inner diameter.

Two first openings 21a (connecting cylinders 21b) are shown on the left and right sides of the first plate 21 on one side (upper side) shown in FIG. 3, and these openings have different diameters. Similarly, the second plate 22 on one side (upper side) shown in FIG. 3 has two second openings 22a on the left and right, which have different diameters.

The third plate 23 is arranged between two second plates 22 spaced apart in the first direction. In this embodiment, three third plates 23 are stacked between two second plates 22 . The third plate 23 is formed to have the same thickness as the second plate 22 . Therefore, the second plate 22 and the third plate 23 can be formed by processing the same material.

The third plate 23 is formed with a third opening 23 a that constitutes the coolant channel 15 . The third openings 23a are holes passing through each third plate 23 or slits extending in the second direction. In the example shown in FIG. 3, the third opening 23a is formed over the two second openings 22a. The third opening 23 a communicates with the second opening 22 a of the second plate 22 .

The first to third plates 21, 22, 23 may be made of materials other than stainless steel, such as aluminum, aluminum alloys, and iron.

FIG. 4 is a cross-sectional view showing an enlarged connection portion of the plate-type refrigerant pipe.
The first joint pipe 12 is attached to a first plate 21 and a second plate 22 arranged on one side (upper side in FIG. 3) in the first direction. The first joint pipe 12 has a large-diameter portion 12a on one end side in the pipe axial direction, a small-diameter portion 12b on the other end side, and a stepped portion 12c in the middle. The large diameter portion 12a and the small diameter portion 12b are cylindrical. The diameter of the large diameter portion 12a is larger than the diameter of the small diameter portion 12b. The stepped portion 12c is formed in a conical shape so that the diameter gradually decreases from the large diameter portion 12a toward the small diameter portion 12b.

The small diameter portion 12b of the first joint pipe 12 is inserted into the first opening 21a and the second opening 22a. The length of the small-diameter portion 12b in the axial direction is substantially the same as the sum of the length of the connecting tube 21b in the first direction and the length of the second opening 22a (thickness of the second plate 22). The outer peripheral surface of the first joint pipe 12 and the inner peripheral surfaces of the first opening 21a and the second opening 22a are joined by brazing using a brazing material B3.

The first joint pipe 12 of the present embodiment is made of a material containing copper as a main component, such as copper or a copper alloy. However, the first joint pipe 12 may be made of other materials such as stainless steel, aluminum, aluminum alloy, and iron.

Another refrigerant pipe 101 is connected to the large diameter portion 12 a of the first joint pipe 12 . This refrigerant pipe 101 is, for example, a refrigerant pipe extending from a four-way switching valve 61 or an electromagnetic valve 62, as shown in FIG. In general, this type of refrigerant pipe 101 is made of a material containing copper as a main component, such as copper or a copper alloy. One end of the refrigerant pipe 101 is inserted into the large diameter portion 12a of the first joint pipe 12, and the outer peripheral surface of the refrigerant pipe 101 and the inner peripheral surface of the large diameter portion 12a are joined by brazing with a brazing material B2. ing. The first joint pipe 12 constitutes a connecting portion (first connecting portion) 51 for connecting another refrigerant pipe 101 to the pipe main body 11 .

Two first joint pipes 12 are connected to the left and right of the first and second plates 21 and 22 on one side (upper side) shown in FIG. is different. The large-diameter first joint pipe 12 is joined to the inner peripheral surfaces of the large-diameter first opening 21a and the second opening 22a. The first joint pipe 12 with a small diameter is joined to the inner peripheral surfaces of the first opening 21a and the second opening 22a with a small diameter.

The first joint pipe 12 may be a pipe with a constant diameter that does not include the large-diameter portion 12a, the small-diameter portion 12b, and the stepped portion 12c. Alternatively, the first joint pipe 12 may be joined only to the first plate 11 without being joined to the second plate 22 .

As shown in FIG. 3, the second joint pipe 13 is attached to the first plate 21 and the second plate 22 arranged on the other side in the first direction (lower side in FIG. 3). A refrigerant pipe 102 connected to a container such as a compressor or an accumulator is connected to the second joint pipe 13 . One end 13a of the second joint pipe 13 is inserted into the first opening 21a and the second opening 22a. The outer peripheral surface of the second joint pipe 13 and the inner peripheral surfaces of the first opening 21a and the second opening 22a are joined by brazing using a brazing material B2.

The second joint pipe 13 includes one end 13a connected to the first and second plates 21 and 22, a curved portion 13b curved 90° from the one end 13a, and extending along the second direction from the curved portion 13b. and a straight portion 13c. As shown in FIG. 2, the other end 13d of the refrigerant pipe 102 is arranged upward or sideways with the plate-type refrigerant pipe 10 standing upright. Therefore, another refrigerant pipe 102 extending from a container such as a compressor can be easily connected to the other end portion 13d of the second joint pipe 13 by burner brazing or the like. Like the first joint pipe 12 , the second joint pipe 13 constitutes a connection portion (first connection portion) 51 for connecting another refrigerant pipe 102 to the pipe main body 11 .

As shown in FIGS. 3 and 4, bronze brazing material is used as brazing material B1 (hereinafter also referred to as "first brazing material") that joins the plurality of plates 21, 22, 23 together. Bronze brazing is also used for the brazing filler metal B3 (hereinafter also referred to as “third brazing filler metal”) that joins the first plate 21 and second plate 22 to the first joint pipe 12 . Bronze brazing is also used for the brazing filler metal (third brazing filler metal) B3 that joins the first and second plates 21 and 22 and the second joint pipe 13 together. On the other hand, phosphor copper brazing material is used for the brazing material B2 (hereinafter also referred to as “second brazing material”) that joins the first joint pipe 12 and the other refrigerant pipe 101 . Phosphor copper brazing is also used for the brazing filler metal (second brazing filler metal) B2 that joins the second joint pipe 13 and the other refrigerant pipe 102 . BCu-3, for example, is used as the bronze solder. BCuP-2, for example, is used as the phosphor copper solder.

The first and third brazing filler metals B1 and B3 have higher melting points than the second brazing filler metal B2.
Since the first brazing material B1 and the third brazing material B3 are the same brazing material, they have the same melting point. However, the first brazing material B1 and the third brazing material B3 may be different materials having the same melting point. The first brazing material B1 and the third brazing material B3 may be different materials with different melting points.

The bonding between the plurality of plates 21, 22, 23 and the bonding between the first and second plates 21, 22 and the first and second joint pipes 12, 13 are performed by furnace brazing. Specifically, a sheet-like first brazing material B1 is set between the plates 21, 22, and 23, and a ring-like brazing material B1 is set between the connection cylinder 21b of one of the first plates 21 and the first joint pipe 12. A third brazing material B3 is set, and in a state in which the ring-shaped third brazing material B3 is set between the connecting tube 21b of the other first plate 21 and the second joint pipe 13, these are placed in the first and third Brazing is performed by putting the brazing materials B1 and B3 into a furnace heated to a melting temperature, for example, around 1040°C. Thus, the plate-type refrigerant pipe 10 is manufactured.

The first and second joint pipes 12, 13 of the plate-type refrigerant pipe 10 manufactured as described above and the other refrigerant pipes 101, 102 are joined by burner brazing using the second brazing material B2. . When the refrigerant pipes 101 and 102 are joined to the first and second joint pipes 12 and 13 by burner brazing, the heat of the burner is transferred not only to the first and second joint pipes 12 but also to the pipe main body 11 by radiation and heat conduction. is also transmitted. In particular, the pipe main body 11 is formed in a block shape by stacking a plurality of plates 21, 22, 23, and has a large heat capacity, so it easily absorbs the heat of the burner. Therefore, heat is easily transferred to the first brazing material B1 that joins the plurality of plates 21, 22, and 23 together. In this embodiment, a material having a higher melting point than the second brazing material B2 is used as the first brazing material B1. Therefore, the second brazing filler metal B2 (and the surrounding first and second joint pipes 12 and 13 and the refrigerant pipes 101 and 102 are heated at a temperature lower than the melting point of the first brazing filler metal B1 and higher than the melting point of the second brazing filler metal B2. ), it is possible to prevent the first brazing material B1 from melting due to the heat generated when the first and second joint pipes 12 and 13 and the refrigerant pipes 101 and 102 are joined.

The melting point of the third brazing filler metal B3 that joins the first and second plates 21 and 22 to the first and second joint pipes 12 and 13 is also higher than the melting point of the second brazing filler metal B2. Therefore, it is possible to prevent the third brazing material B3 from melting due to the heat generated when the first and second joint pipes 12 and 13 and the refrigerant pipe 101 are joined.

In this embodiment, as shown in FIG. 4, the distance L between the connecting tube 21b of the first plate 21 and the refrigerant pipe 101 attached to the large-diameter portion 12a of the first joint pipe 12 is 100 mm or less. . When the distance L between the connecting tube 21b and the refrigerant pipe 101 is set in this manner, the heat of the burner is easily transmitted to the pipe main body 11. Therefore, the melting points of the brazing filler metals B1, B2, and B3 are set as described above. is more effective.

The second joint pipe 13 is longer than the first joint pipe 12 in the axial direction. The distance between the connection tube 21b of the first plate 21 and the refrigerant pipe 102 connected to the second joint pipe 13 exceeds 100 mm. Therefore, the heat of the burner for brazing the second joint pipe 13 and the refrigerant pipe 102 is less likely to be transmitted to the pipe main body 11 by heat conduction than the first joint pipe 12 . However, the second joint pipe 13 is bent 90° halfway, and the other end 13 d to which the refrigerant pipe 102 is connected is close to the pipe body 11 . Therefore, the heat of the burner is easily transmitted to the pipe main body 11 by radiation. Therefore, like the first joint pipe 12, it is preferable to connect the refrigerant pipe 102 to the second joint pipe 13 using the second brazing filler metal B2 having a lower melting point than the first brazing filler metal B1.

[Second embodiment]
FIG. 5 is a cross-sectional view showing an enlarged connection portion of the plate-type refrigerant pipe according to the second embodiment.
In the plate-type refrigerant pipe 10 of the present embodiment, among the plurality of plates constituting the pipe main body 11, the first plates 21 arranged at both end portions in the first direction are connected pipes 21b as in the first embodiment. , and the first joint pipe 12 is attached only to the first opening 21 a formed in the first plate 21 . The first plate 21 of the present embodiment has the same thickness as the second plate 22 and the third plate 23 in order to secure the joint length with the first joint pipe 12 . The pipe main body 11 is arranged between two first plates 21 on both sides in the first direction, two second plates 22 laminated on each first plate 21, and the two second plates 22. It consists of a total of five plates 21, 22, and 23, including one third plate 23.

The second plate 22 is formed with a fourth opening 22b that configures the coolant flow path 15 in the same manner as the third plate 23 . Other configurations are the same as those of the first embodiment. Also in this embodiment, the relationship between the melting points of the brazing filler metals B1, B2, and B3 is the same as in the first embodiment.

[Third embodiment]
FIG. 6 is a cross-sectional view showing an enlarged connection portion of a plate-type refrigerant pipe according to the third embodiment.
In the plate-type refrigerant pipe 10 of the present embodiment, the connecting cylinders 21 b provided on the first plates 21 arranged at both ends in the first direction among the plurality of plates constituting the pipe main body 11 are connected to the first plates 21 It is composed of a separate body instead of being integrated with. The connection tube 21b is made of the same material as the first plate 21, such as stainless steel, and is brazed to the first plate 21. As shown in FIG. Specifically, a fifth opening 21c is formed in the first plate 21, and the connecting tube 21b is inserted into the fifth opening 21c, so that the inner peripheral surface of the fifth opening 21c and the outer peripheral surface of the connecting tube 21b are aligned with each other. 4 Joined with brazing material B4. The first joint pipe 12 is inserted into the connecting tube 21b and brazed to the connecting tube 21b with a third brazing material B3.

If the first opening 21a is formed by burring as in the first embodiment, it is difficult to form the first opening 21a with an accurate diameter. Since it is not necessary to apply the coating, the dimensional accuracy of the first opening 21a can be improved.

[Fourth embodiment]
FIG. 7 is a cross-sectional view showing an enlarged connection portion of the plate-type refrigerant pipe according to the fourth embodiment.
The plate-type refrigerant pipe 10 of this embodiment has the same configuration of the plates 21, 22, and 23 of the pipe main body 11 as the pipe main body 11 shown in FIG. The refrigerant pipe 101 is directly inserted into the first opening 21a of the first plate 21 and the second opening 22a of the second plate 22, and the inner peripheral surface of the first opening 21a and the inner peripheral surface of the second opening 22a, The outer peripheral surface of the refrigerant pipe 101 is brazed with the second brazing material B2.

In the present embodiment, the inner peripheral surface of the first opening 21a in the first plate 21 and the inner peripheral surface of the second opening 22a in the second plate 22 are connecting portions (first connection part) 51. In other words, the first connecting portion 51 is provided integrally with the first plate 21 and the second plate 22 .

In the example shown in FIG. 7, the first plate 21 has the connection tube 21b, but the connection tube 21b may be omitted. The refrigerant pipe 101 may be joined only to the first plate 21 . When the refrigerant pipe 101 is joined only to the first plate 21 without the connecting tube 21b, the thickness of the first plate 21 can be made as thick as the second plate 22 in order to secure the joint length. preferable.

[Fifth embodiment]
FIG. 8 is a cross-sectional view showing an enlarged connection portion of the plate-type refrigerant pipe according to the fifth embodiment.
The plate-type refrigerant pipe 10 of this embodiment is the same as the plate-type refrigerant pipe 10 of the second embodiment shown in FIG. In the present embodiment, the second plate 22 is formed with a fourth opening 22b that forms the refrigerant flow path 15, and the peripheral edge portion 22d of the fourth opening 22b extends from one end of the first joint pipe 12 (the end on the side of the small diameter portion 12b). part) to position the first joint pipe 12 in the direction of the pipe axis. Other configurations are the same as those of the second embodiment.

[Sixth embodiment]
FIG. 9 is a cross-sectional view showing an enlarged connection portion of a plate-type refrigerant pipe according to the sixth embodiment.
The plate-type refrigerant pipe 10 of this embodiment is the same as the plate-type refrigerant pipe 10 of the second embodiment shown in FIG. In this embodiment, a ridge 21d protruding radially inward is formed at the lower end of the first opening 21a of the first plate 21, and the ridge 21d forms one end (small diameter portion) of the first joint pipe 12. 12b side) to position the first joint pipe 12 in the axial direction of the pipe. Other configurations are substantially the same as those of the second embodiment.

[Seventh embodiment]
FIG. 10 is a cross-sectional view of part of a plate-type refrigerant pipe according to the seventh embodiment.
The plate-type refrigerant pipe 10 of the present embodiment is provided with first joint pipes 12 on both sides of the pipe main body 11 in the first direction, and another refrigerant pipe 101 is connected to the first joint pipes 12 . Other configurations are substantially the same as those of the first embodiment.

[Action and effect of the embodiment]
(1) The plate-type refrigerant pipe 10 of the above embodiment includes a first plate 21, a second plate 22 stacked on the first plate 21, and a first brazing plate that joins the first plate 21 and the second plate 22. a material B1, a first connection portion 51 provided on the first plate 21 for connecting the other refrigerant pipes 101 and 102, and a second braze for joining the other refrigerant pipes 101 and 102 to the first connection portion 51. and a material B1. The melting point of the first brazing material B1 is higher than the melting point of the second brazing material B2. Therefore, when the other refrigerant pipes 101 and 102 are joined to the first connecting portion 51 with the second brazing filler metal B2, the second brazing filler metal B2 is heated at a temperature lower than the melting point of the first brazing filler metal B1 and higher than the melting point of the second brazing filler metal B2. By heating one connection portion 51, the other refrigerant pipes 101 and 102 can be joined to the first connection portion 51 while suppressing adverse effects on the joining of the plates 21 and 22 by the first brazing material B1. can be done. In other words, the other refrigerant pipes 101 and 102 can be joined to the first connecting portion 51 without melting the first brazing material B1.

(2) In the above embodiment, the plate-type refrigerant pipe 10 has the first connecting portion 51 which is a separate pipe (first joint pipe 12, second joint pipe 13) from the first plate 21, and the first connection A third brazing material B3 that joins the portion 51 and the first plate 21 is further provided, and the melting point of the third brazing material B3 is higher than the melting point of the second brazing material B2. Therefore, when the other refrigerant pipes 101 and 102 are brazed to the first connection portions 12 and 13 with the second brazing filler metal B2, the temperature is lower than the melting point of the third brazing filler metal B3 and higher than the melting point of the second brazing filler metal B2. By heating the second brazing filler metal B2 with , the other refrigerant pipes 101 and 102 can be joined to the first connecting portions 12 and 13 without melting the third brazing filler metal B3.

(3) In the above embodiment, the melting point of the first brazing material B1 and the melting point of the third brazing material B3 are the same. Therefore, the bonding between the first plate 21 and the second plate 22 and the
and the first connecting portions 12 and 13 are simultaneously brazed by furnace brazing or the like, the temperature control in the furnace becomes easy, and the manufacturing can be easily performed.

(4) In the above embodiment, the first plate 21 is provided with a cylindrical second connection portion (connection cylinder) 21b that protrudes in the stacking direction (first direction) of the first and second plates 21 and 22. , the first connection portions 12 and 13 are joined to the second connection portion 21b. Therefore, the bonding length between the first connecting portions 12 and 13 and the first plate 21 can be ensured, and the two can be firmly bonded.

(5) In the above embodiment, the first connecting portions 12 and 13 are made of a material containing copper as a main component. Generally, since copper or a copper alloy is often used for refrigerant pipes, by forming the first connection portions 12 and 13 with a material containing copper as a main component, the first connection portions 12 and 13 and other The connection with the refrigerant pipes 101 and 102 can be made using an inexpensive brazing material.

(6) In the above-described fourth embodiment, the first connecting portion 51 is provided integrally with the first plate 21 . Therefore, the pipes 12 and 13 separate from the first plate 21 are not required, and the structure of the plate-type refrigerant pipe 10 can be simplified.

(7) In the above embodiment, the first plate 21 and the second plate 22 are made of stainless steel. Since stainless steel is cheaper than copper, the manufacturing cost of the plate-type refrigerant pipe 10 can be reduced.

(8) In the above embodiment, the plate-type refrigerant pipe 10 has the first brazing material B1 arranged between the first plate 21 and the second plate 22 laminated on the first plate 21, and the first brazing material B1 A third brazing material B3 is arranged between the plate 21 and the joint pipes 12, 13 for connecting the other refrigerant pipes 101, 102, and the first plate 21, the second plate 22, and the joint pipes 12, 12, 13 and the joint pipes 12, 13 after the first step, the second brazing filler metal B2 having a melting point lower than that of the first brazing filler metal B and the third brazing filler metal B3. A second step of burner brazing the refrigerant pipes 101 and 102 is included. In the above manufacturing method, the first brazing material B1 that joins the first plate 21 and the second plate 22 and the third brazing material B3 that joins the first plate 21 and the joint pipes 12 and 13 are melted. Instead, the other refrigerant pipes 101, 102 can be joined to the joint pipes 12, 13 by the second brazing material B2.

The present disclosure is not limited to the above examples, but is indicated by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.
For example, the number of plates constituting the pipe main body 11 is not limited to the above embodiment, and the plate-type refrigerant pipe of the present disclosure only needs to include the first plate and the second plate.

10: Plate-type refrigerant pipe 12: First joint pipe (first connecting portion)
13: Second joint pipe (first connecting part)
21 : first plate 21a : first opening 21b : second connecting portion 22 : second plate 22a : second opening 51 : first connecting portion 101 : other refrigerant pipe 102 : other refrigerant pipe B1 : first brazing material B2: Second brazing material B3: Third brazing material

Claims (9)

a first plate (21);
a second plate (22) laminated on the first plate (21);
a first brazing material (B1) for joining the first plate (21) and the second plate (22);
a first connection portion (51) provided on the first plate (21) for connecting other refrigerant pipes (101, 102);
a second brazing material (B2) for joining the other refrigerant pipes (101, 102) to the first connecting portion (51);
A plate-type refrigerant pipe, wherein the melting point of the first brazing material (B1) is higher than the melting point of the second brazing material (B2). The first connecting portion (51) is a tube (12, 13) separate from the first plate (21),
further comprising a third brazing material (B3) for joining the first connecting portion (51) and the first plate (21),
2. The plate-type refrigerant pipe according to claim 1, wherein the melting point of the third brazing material (B3) is higher than the melting point of the second brazing material (B2). 3. The plate-type refrigerant pipe according to claim 2, wherein the melting point of the first brazing material (B1) and the melting point of the third brazing material (B3) are the same. The first plate (21) has a cylindrical second connection portion (21b) projecting in the stacking direction of the first plate (21) and the second plate (22),
The plate-type refrigerant pipe according to claim 2 or 3, wherein the first connection portion (51) is joined to the second connection portion (21b). The plate-type refrigerant pipe according to any one of claims 2 to 4, wherein the first connecting portion (51) is made of a material containing copper as a main component. The plate-type refrigerant pipe according to claim 1, wherein the first connecting portion (51) is provided integrally with the first plate (21). The plate-type refrigerant pipe according to any one of claims 1 to 6, wherein the first plate (21) and the second plate (22) are made of stainless steel. Having the plate-type refrigerant pipe according to any one of claims 1 to 7 and another refrigerant pipe (101, 102) connected to the first connection part (51) of the plate-type refrigerant pipe, air harmony machine. A first brazing material (B1) is arranged between a first plate (21) and a second plate (22) laminated on the first plate (21), and the first plate (21) and , joint pipes (12, 13) for connecting other refrigerant pipes (101, 102), a third brazing material (B3) is arranged between the first plate (21), the second plate (22), and a first step of furnace brazing the joint pipes (12, 13), and after the first step, to the joint pipes (12, 13), the first brazing material (B1) and the A method for manufacturing a plate-type refrigerant pipe, comprising a second step of burner brazing other refrigerant pipes (101, 102) with a second brazing material (B2) having a lower melting point than a third brazing material (B3).

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