JP6950735B2 - Refrigerant equipment and refrigerant piping for the refrigeration equipment - Google Patents

Description

The present disclosure relates to a refrigerating apparatus and a refrigerant pipe of the refrigerating apparatus.

Conventionally, copper pipes are often used as refrigerant pipes in refrigerating equipment such as air conditioners or air conditioners. In addition, copper tubes are often used for connecting service ports, pressure sensors, and the like. The connection between such a thin tube and the refrigerant pipe communicating with the thin tube has been manually brazed so far.

Copper pipes have the advantage of being relatively easy to process, but because of the high material costs, it is conceivable to use relatively inexpensive refrigerant pipes made of stainless steel (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-151327

However, if the refrigerant pipe of the refrigerating apparatus is made of stainless steel, the work of connecting the refrigerant pipe and the thin pipe becomes complicated.
An object of the present disclosure is to provide a refrigerating apparatus and a refrigerant pipe of the refrigerating apparatus, which can be easily connected to a thin tube.

The refrigerant pipe of the refrigerating apparatus of the present disclosure (hereinafter, also simply referred to as “refrigerant pipe”) is
(1) The first stainless steel pipe through which the refrigerant flows,
A joint pipe provided on the outer peripheral surface of the first pipe and made of a material different from stainless steel,
The pipe diameter is smaller than that of the first pipe, the outer peripheral surface of the first pipe is provided with a second pipe connected via the joint pipe, and the surface to be connected to the joint pipe of the second pipe is the said. It is made of the same material as the joint pipe and
The second pipe has a pipe body made of stainless steel and a connecting portion provided at an end of the piping body and made of a pipe or a plating layer made of a material different from stainless steel , and the connecting portion is covered. Including the connecting surface.

In the refrigerant pipe of the present disclosure, the joint pipe provided on the outer peripheral surface of the first stainless steel pipe is made of a material different from that of stainless steel, and the second pipe is connected to the outer peripheral surface of the first pipe via the joint pipe. The surface of the pipe to be connected to the joint pipe is made of the same material as the joint pipe. Therefore, it is not necessary to braze the stainless steel pipe, which involves complicated work, and the second pipe, which is a thin pipe, can be easily connected to the first stainless steel pipe. In addition, in this specification, "the same material" means that the main component is the same, and is not limited to the case where the constituent components are the same. For example, copper and a copper alloy containing copper as a main component are made of the same material, and an aluminum alloy containing aluminum as a main component and another aluminum alloy containing aluminum as a main component are made of the same material. A copper alloy is an alloy in which the properties of copper are improved by adding another metal to copper as a main component. Aluminum alloy is an alloy in which the properties of aluminum are improved by adding other metals to aluminum as the main component. Further, in the present specification, "copper" is "pure copper" containing 99.9% by weight or more of copper as a main component, and "aluminum" is 99.9% by weight of aluminum as a main component. It is "pure aluminum" including the above.

(2) In the refrigerant pipe of the above (1), the joint pipe is provided in the first pipe in a direction orthogonal to the pipe axis direction of the first pipe.

(3) In the refrigerant pipe of (1) or (2), the connected surface of the joint pipe and the second pipe is made of copper or a copper alloy. Since the joint pipe and the second pipe can be connected by hand brazing, the second pipe can be easily connected to the first stainless steel pipe.

(4) before Symbol second pipe has a stainless steel pipe body, and a connecting portion provided at an end portion of the pipe body, the connection unit comprises said target connection surface. The second pipe is connected to the outer peripheral surface of the first pipe via a joint pipe made of a material different from stainless steel, and the connected surface of the connection portion provided on the stainless steel pipe body of the second pipe is the joint pipe. It is the same material as. Therefore, it is not necessary to braze the stainless steel pipe, which involves complicated work, and the second pipe can be easily connected to the first stainless steel pipe.

(5) In the refrigerant pipe of the above (4), the pipe main body has a second large diameter portion and a second small diameter portion having a diameter smaller than that of the second large diameter portion, and the connecting portion has the second small diameter portion. It can be a pipe provided on the outer peripheral surface of the portion. The outer peripheral surface of the pipe provided on the outer peripheral surface of the second small diameter portion of the pipe body constitutes the connected surface. The connected surface and the joint pipe are made of the same material, and the two can be easily connected by a conventional method such as hand brazing.

(7) In the refrigerant pipes (1) to (6), it is desirable that a first positioning mechanism for determining the position of the joint pipe with respect to the first pipe is provided on the outer peripheral surface of the joint pipe. The position of the joint pipe with respect to the first pipe can be easily determined by the first positioning mechanism.

(8) In the refrigerant pipes (1) to (7), it is desirable that the joint pipe or the second pipe has a second positioning mechanism for determining the position of the second pipe with respect to the joint pipe. The position of the joint pipe with respect to the second pipe can be easily determined by the second positioning mechanism.

(9) In the refrigerant pipes (1) to (8), it is desirable that the second pipe overlaps with the first pipe in the pipe radial direction of the second pipe. When the second pipe overlaps with the first pipe in the pipe radial direction of the second pipe, the second pipe is connected to the first pipe via the joint pipe, so that the connecting portion between the joint pipe and the first pipe Then, the second pipe and the joint pipe exist in the pipe radial direction of the second pipe. Due to the presence of the second pipe, the strength of the connecting portion between the joint pipe and the first pipe can be improved as compared with the case where only the joint pipe is present.

(10) In the refrigerant pipe of (4) or (5), it is desirable that the pipe main body of the second pipe overlaps with the first pipe in the pipe radial direction of the second pipe. When the pipe body of the second pipe overlaps with the first pipe in the pipe radial direction of the second pipe, the pipe body of the second pipe is connected to the first pipe via the joint pipe, so that the joint pipe and the first pipe are connected. At the connection portion with one pipe, the pipe body and the joint pipe of the second pipe exist in the pipe radial direction of the second pipe. In addition, the piping body is made of stainless steel and has higher rigidity than copper pipes. Due to the presence of the pipe body of the second pipe, not only the strength of the connecting portion between the joint pipe and the first pipe but also the first pipe and the second pipe via the joint pipe are compared with the case where only the joint pipe is present. The strength of the pipe connection can be improved.

(11) The refrigerating apparatus of the present disclosure includes a refrigerant circuit including a plurality of element parts and a refrigerant pipe connecting the plurality of element parts.
The refrigerant pipe connecting the plurality of element components includes the refrigerant pipe according to any one of (1) to (10).

It is a schematic block diagram of one Embodiment of the refrigerating apparatus of this disclosure. It is a schematic block diagram of another embodiment of the refrigerating apparatus of this disclosure. It is a front explanatory view of an example of the switching mechanism including the refrigerant pipe which concerns on 1st Embodiment of this disclosure. It is a perspective explanatory view around the compressor including the switching mechanism shown in FIG. It is sectional drawing of the refrigerant pipe which concerns on 1st Embodiment of this disclosure. It is explanatory drawing of the thin pipe of the refrigerant pipe shown in FIG. It is explanatory drawing of the joint of the refrigerant pipe shown in FIG. It is sectional drawing of the refrigerant pipe which concerns on 2nd Embodiment of this disclosure. It is sectional drawing of the refrigerant pipe which concerns on 3rd Embodiment of this disclosure. It is explanatory drawing of the joint of the refrigerant pipe shown in FIG. It is sectional drawing of the refrigerant pipe which concerns on 4th Embodiment of this disclosure. It is explanatory drawing of the joint of the refrigerant pipe shown in FIG. It is sectional drawing explanatory drawing of the modification of the refrigerant pipe shown in FIG. It is sectional drawing explanatory view of the modification of the joint shown in FIG.

Hereinafter, the refrigerating apparatus of the present disclosure and the refrigerant piping of the refrigerating apparatus will be described in detail with reference to the accompanying drawings. It should be noted that the present disclosure is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

[Air conditioner A]
FIG. 1 is a schematic configuration diagram of an air conditioner or an air conditioner A, which is a refrigerating device, according to an embodiment of the present disclosure. The air conditioner A adjusts the temperature and humidity in the air-conditioned room by a vapor compression refrigeration cycle. The air conditioner A includes an indoor unit 1 installed indoors and an outdoor unit 2 installed outdoors. The indoor unit 1 and the outdoor unit 2 are connected to each other by a refrigerant pipe 8.

The air conditioner A includes a refrigerant circuit 3 that performs a vapor compression refrigeration cycle. The refrigerant circuit 3 includes a plurality of element parts and a refrigerant pipe 8 for connecting the plurality of element parts.

The refrigerant circuit 3 includes a compressor 4 that compresses the refrigerant to generate a high-temperature and high-pressure gas refrigerant, an indoor heat exchanger 5, an electronic expansion valve 6 that reduces the pressure of the refrigerant, an outdoor heat exchanger 7, an accumulator 11, a muffler 15, and four. A path switching valve 16 and the like are provided, and these are connected by a refrigerant pipe 8. The compressor 4, the indoor heat exchanger 5, the electronic expansion valve 6, the outdoor heat exchanger 7, the accumulator 11, the muffler 15, the four-way switching valve 16, and the gas closing valve and the liquid closing valve described later constitute the air conditioner A. Equipment or parts to be connected to other equipment or parts by the refrigerant pipe 8. In the present specification, these devices or parts are also referred to as element parts constituting the refrigerating apparatus.

The compressor 4 compresses the low-pressure gas refrigerant and discharges the high-pressure gas refrigerant. The compressor 4 has a suction port or a suction portion 4a and a discharge port or a discharge portion 4b. The low-pressure gas refrigerant is sucked from the suction unit 4a. The high-pressure gas refrigerant is discharged from the discharge unit 4b in the direction of arrow D. As the compressor 4, for example, various compressors such as a scroll compressor can be adopted. The compressor 4 is fixed to the bottom plate or the like of the casing 2a of the outdoor unit 2.

The indoor heat exchanger 5 is provided in the indoor unit 1 and exchanges heat between the refrigerant and the indoor air. As the indoor heat exchanger 5, for example, a cross-fin type fin-and-tube heat exchanger, a microchannel heat exchanger, or the like can be adopted. In the vicinity of the indoor heat exchanger 5, an indoor fan 9 for blowing indoor air to the indoor heat exchanger 5 and sending conditioned air into the room is provided.

The electronic expansion valve 6 is arranged between the outdoor heat exchanger 7 and the indoor heat exchanger 5 in the refrigerant pipe 8 of the refrigerant circuit 3, expands the inflowing refrigerant, and reduces the pressure to a predetermined pressure.

The outdoor heat exchanger 7 exchanges heat between the refrigerant and the outdoor air. As the outdoor heat exchanger 7, for example, a cross-fin type fin-and-tube heat exchanger, a microchannel heat exchanger, or the like can be adopted. An outdoor fan 10 for blowing outdoor air to the outdoor heat exchanger 7 is provided in the vicinity of the outdoor heat exchanger 7.

In the present embodiment, the accumulator 11 is provided in the refrigerant pipe 8a on the suction side of the compressor 4. The accumulator 11 is fixed to the bottom plate or the like of the casing 2a of the outdoor unit 2. A muffler 15 for reducing the pressure pulsation of the refrigerant discharged from the compressor 4 is provided in the refrigerant pipe 8b on the discharge side of the compressor 4.

The refrigerant pipe 8 is provided with a four-way switching valve 16, a gas closing valve 17, and a liquid closing valve 18 for switching the refrigerant flow path. By switching the four-way switching valve 16, the flow of the refrigerant is reversed, and the refrigerant discharged from the compressor 4 is switched between the outdoor heat exchanger 7 and the indoor heat exchanger 5 to supply the cooling operation and the heating operation. It is possible to switch.

The gas shutoff valve 17 and the liquid shutoff valve 18 open or close the refrigerant path. Opening and closing are performed, for example, manually. The gas closing valve 17 and the liquid closing valve 18 are closed to prevent the refrigerant sealed in the outdoor unit 2 from leaking to the outside, for example, when the air conditioner A is installed. On the other hand, the gas closing valve 17 and the liquid closing valve 18 are opened when the air conditioner A is used.

During the heating operation of the air conditioner A, the four-way switching valve 16 is switched as shown by the solid line so that the refrigerant flows in the direction indicated by the solid line arrow. As a result, the high-pressure gas refrigerant discharged from the compressor 4 in the direction of arrow D passes through the muffler 15 and the four-way switching valve 16 and then through the opened gas closing valve 17, and then passes through the open gas closing valve 17 to pass through the indoor heat exchanger 5. to go into. The high-pressure gas refrigerant dissipates heat in the process of becoming a high-pressure liquid refrigerant in the indoor heat exchanger 5. The high-pressure liquid refrigerant reaches the electronic expansion valve 6 via the opened liquid closing valve 18, and is depressurized by the electronic expansion valve 6. The decompressed refrigerant reaches the outdoor heat exchanger 7 and absorbs heat in the outdoor heat exchanger 7 to become a low-pressure gas refrigerant. The low-pressure gas refrigerant is sucked into the compressor 4 via the four-way switching valve 16 and the accumulator 11. During the heating operation, the indoor heat exchanger 5 functions as a radiator, and the outdoor heat exchanger 7 functions as a heat absorber.

On the other hand, during the cooling operation, the flow of the refrigerant is reversed by switching the four-way switching valve 16 as shown by the dotted line, and the refrigerant flows in the direction indicated by the dotted arrow. As a result, the high-pressure gas refrigerant discharged from the compressor 4 in the direction of arrow D passes through the muffler 15 and the four-way switching valve 16 and then enters the outdoor heat exchanger 7. The high-pressure gas refrigerant dissipates heat in the process of becoming a high-pressure liquid refrigerant in the outdoor heat exchanger 7. The high-pressure liquid refrigerant reaches the electronic expansion valve 6 and is depressurized by the electronic expansion valve 6. The decompressed refrigerant reaches the indoor heat exchanger 5 via the opened liquid closing valve 18, and absorbs heat in the indoor heat exchanger 5 to become a low-pressure gas refrigerant. The low-pressure gas refrigerant is sucked into the compressor 4 via the opened gas closing valve 17, the four-way switching valve 16, and the accumulator 11. During the cooling operation, the indoor heat exchanger 5 functions as a heat absorber, and the outdoor heat exchanger 7 functions as a radiator.

[Air conditioner B]
FIG. 2 is a schematic configuration diagram of an air conditioner or an air conditioner B, which is a refrigerating device, according to another embodiment of the present disclosure. In the air conditioner B, an oil separator 12 is provided in the refrigerant pipe 8b on the discharge side of the compressor 4 instead of the muffler 15. The oil separated by the oil separator 12 is returned to the refrigerant pipe 8a on the suction side of the compressor 4 via the oil return pipe 14 in which the valve 13 is arranged. The configurations other than the oil separator 12, the valve 13, and the oil return pipe 14 are the same as those shown in FIG. 1, and the common configurations or elements are numbered the same. Then, for the sake of simplicity, the description of common configurations or elements will be omitted. In the example shown in FIGS. 1 and 2, either the muffler 15 or the oil separator 12 is provided in the refrigerant pipe 8b on the discharge side of the compressor 4, but the muffler 15 and the oil separator 12 are used. It can also be provided in the refrigerant pipe 8b.

[Switching mechanism C]
FIG. 3 is a front explanatory view of the switching mechanism C in the air conditioners A and B according to the present embodiment, and FIG. 4 is a perspective explanatory view of the compressor including the switching mechanism C shown in FIG. The switching mechanism C includes a refrigerant pipe according to an embodiment of the present disclosure, which will be described later.

The switching mechanism C has a four-way switching valve 16 and pipes 21, 22, 23, and 24 connected to the four ports or connection ports of the four-way switching valve 16, respectively. The four-way switching valve 16 including the four ports and the pipes 21, 22, 23, 24 are made of stainless steel, which has a higher rigidity than copper. As the stainless steel, for example, SUS304, SUS304L, SUS436L, SUS430 and the like can be used. In the present embodiment, not only the four-way switching valve 16 but also the piping connected to the four ports of the four-way switching valve 16 is included in the switching mechanism. In other words, the switching mechanism is a mechanism that can be assembled as a unit or assembly in advance in a factory or the like and has a function of switching the refrigerant flow path. This switching mechanism C is connected to a connecting portion or a connecting pipe provided in an element component such as a compressor 4 or an accumulator 11 by brazing or the like at a site where the outdoor unit 2 is assembled.

The four-way switching valve 16 has a valve body 16a constituting an outer shell, a valve body housed inside the valve body 16a, and the like. The valve body 16a is made of stainless steel. The four-way switching valve 16 is composed of a short pipe and has four ports that form an inlet / outlet for the refrigerant, that is, a first port 31, a second port 32, a third port 33, and a fourth port 34. These first to fourth ports 31 to 34 are made of stainless steel. One ends of the pipe 21, the pipe 22, the pipe 23, and the pipe 24 are connected to the first to fourth ports 31 to 34, respectively.
In the installed state of the four-way switching valve 16, the first port 31 has an upward posture, and the second to fourth ports 32, 33, and 34 have a downward posture.

Copper connecting portions 44 are provided at the ends 22a, 23a, and 24a (ends on the side opposite to the side connected to the four-way switching valve 16) of the stainless steel pipes 22 to 24, respectively. Further, in the present embodiment, the muffler 15 is made of stainless steel. The pipe 21 in the present embodiment is a pipe for flowing a refrigerant between the four-way switching valve 16 and the compressor 4 via the muffler 15, and connects the first port 31 of the four-way switching valve 16 and the muffler 15. It is composed of a pipe 21a to be connected and a pipe 21b to connect the muffler 15 and the discharge portion 4b of the compressor 4. After extending upward from the muffler 15, the pipe 21a is folded back and connected to the first port 31 in a downward posture. A copper connecting portion 44 is provided at the end portion 21c of the pipe 21b (the end opposite to the side connected to the muffler 15) in the same manner as the pipes 22 to 24.

The pipe 22 connects the second port 32 of the four-way switching valve 16 and the connecting pipe 11a on the inlet side of the accumulator 11. The pipe 22 connected to the connecting pipe 11a on the inlet side of the accumulator 11 extends upward, folds back and extends downward, and then folds upward again and is connected to the second port 32 in an upward posture. One end of the refrigerant pipe 38 is connected to a connecting pipe (not shown) on the outlet side of the accumulator 11, and the other end of the refrigerant pipe 38 is connected to the suction portion of the compressor 4. The refrigerant pipe 38 is also made of stainless steel. As shown in FIG. 4, the compressor 4 in the present embodiment includes an auxiliary accumulator 4d integrated with the compressor main body 4c, and the suction portion 4a of the auxiliary accumulator 4d serves as a suction portion of the compressor 4. It is functioning.

The pipe 23 circulates the refrigerant between the gas header (not shown) of the outdoor heat exchanger 7 and the third port 33 of the four-way switching valve 16. Further, the pipe 24 connects the gas closing valve 17 and the fourth port 34 of the four-way switching valve 16.

In the switching mechanism C shown in FIG. 3, the connection between stainless steel and the connection between stainless steel and copper are both performed by brazing in the furnace. In the present embodiment, the entire switching mechanism C in which the four-way switching valve 16, the muffler 15, the pipes 21, 22, 23, 24, and the copper joint 40 described later are temporarily assembled is put into the furnace, and the connecting portions are simultaneously connected to the furnace. It is brazed inside.

[Refrigerant piping R1 (first embodiment)]
FIG. 5 is a cross-sectional explanatory view of the refrigerant pipe R1 according to the first embodiment of the present disclosure. As shown in FIGS. 3 to 4, a copper thin tube 41 is connected to the outer peripheral surface of the pipe 23 via a copper joint 40. The refrigerant pipe R1 according to the first embodiment of the present disclosure is configured by the pipe 23, the joint 40, and the thin pipe 41. More specifically, the refrigerant pipe R1 has a pipe 23 which is a first stainless steel pipe, a joint 40 which is a joint pipe provided on the outer peripheral surface of the pipe 23, and a pipe diameter smaller than that of the pipe 23. The outer peripheral surface of the pipe is provided with a thin pipe 41 which is a second pipe connected via a joint 40. The material of the joint 40 is copper, which is a material different from stainless steel, which is the material of the pipe 23. The outer peripheral surface 41a of the thin tube 41, which is the surface to be connected to the joint 40, is made of the same material (copper) as the joint 40. As described above, the copper joint 40 and the stainless steel pipe 23 can be connected by brazing in the furnace. On the other hand, the copper joint 40 and the copper thin tube 41 can be connected by manual brazing (hand brazing) such as torch brazing (burner brazing). In FIG. 5, reference numeral 26 indicates a brazing material used during brazing in a furnace, and reference numeral 27 indicates a brazing material used during manual brazing. In addition, in FIG. 5, FIG. 8, FIG. 9, FIG. 11 and FIG. 13, which will be described later, the thickness of the brazed material in the pipe radial direction is exaggerated in order to make the brazed portion easy to understand.

Since the thin tube 41 has a smaller diameter than other refrigerant pipes, if it is made of stainless steel, there is an adverse effect that the manufacturing cost is rather high in order to obtain a predetermined accuracy. Therefore, in the present embodiment, the thin tube 41 is made of copper, and only the copper joint 40 is connected to the pipe 23 by brazing in the furnace. If the thin pipe 41 and the joint 40 are connected to the pipe 23 by brazing in the furnace, the strength of the thin pipe 41 may decrease during annealing in the furnace. However, in the present embodiment, only the joint 40 is brazed to the pipe 23 in the furnace. It is connected with a braze. As a result, the thin tube 41 can be connected to the pipe 23 via the joint 40 by manual brazing without causing a decrease in the strength of the thin tube 41.

The thin tube 41 can be used as a service port, and is used for attaching functional parts such as a pressure sensor and filling with a refrigerant during maintenance and inspection of the air conditioner A. As shown in FIG. 6, the thin tube 41 is flared on one end side (tip side). As shown in FIG. 7, the joint 40 has a flare shape with one end side expanded in diameter. The joint 40 includes a flared first large diameter portion 40a, a short tubular first small diameter portion 40b having a diameter smaller than that of the first large diameter portion 40a, and a first large diameter portion 40a and a first small diameter portion 40b. It is provided with a first inclined portion 40c for connecting the above. The first small diameter portion 40b is inserted into the hole 36 formed in the pipe 23. At that time, the first positioning mechanism is connected to one end of the first small diameter portion 40b inserted into the hole 36, and the first inclined portion 40c whose diameter is expanded from the one end determines the position of the joint 40 with respect to the pipe 23. Functions as. The position of the joint 40 with respect to the pipe 23 is determined by the outer peripheral surface of the first inclined portion 40c hitting the peripheral edge of the hole 36. The position of the joint 40 with respect to the pipe 23 can be easily determined by the first inclined portion 40c. The joint 40 is provided in the pipe 23 in a direction orthogonal to the pipe axis direction of the pipe 23.

Then, the other end 41a (the end on the side opposite to the flared one end side) of the thin tube 41 shown in FIG. 6 is inserted into the flared first large diameter portion 40a of the joint 40. At that time, the first inclined portion 40c, which is connected to one end of the first large-diameter portion 40a into which the thin tube 41 is inserted and whose diameter is reduced from the one end, determines the position of the thin tube 41 with respect to the joint 40. Functions as a mechanism. The position of the thin tube 41 with respect to the joint 40 is determined by the other end 41a of the thin tube 41 hitting the inner peripheral surface of the first inclined portion 40c. With the first inclined portion 40c, the position of the thin tube 41 with respect to the joint 40 can be easily determined. In the refrigerant pipe R1, the first inclined portion 40c of the joint 40 functions as a first positioning mechanism and also as a second positioning mechanism.

[Refrigerant piping R2 (second embodiment)]
FIG. 8 is a cross-sectional explanatory view of the refrigerant pipe R2 according to the second embodiment of the present disclosure. The difference between the refrigerant pipe R2 and the refrigerant pipe R1 according to the first embodiment of the present disclosure described above is that the second pipe connected to the stainless steel pipe 23 is a stainless steel pipe instead of the copper thin pipe 41. The main body 50 and the copper pipe 51, which is a connecting portion provided at the end of the piping main body 50, are used. Therefore, in the refrigerant pipe R2, the elements or parts common to the refrigerant pipe R1 are designated by the same reference numerals as those of the refrigerant pipe R1, and the description thereof will be omitted for the sake of simplicity.

In the refrigerant pipe R2, the second pipe composed of the pipe main body 50 and the copper pipe 51 has a smaller pipe diameter than the pipe 23 which is the first pipe. The piping main body 50 has a second large diameter portion 50a, a second small diameter portion 50b having a diameter smaller than that of the second large diameter portion 50a, and a second connecting the second large diameter portion 50a and the second small diameter portion 50b. It is provided with an inclined portion 50c. The copper pipe 51 can be connected to the outer peripheral surface of the second small diameter portion 50b, which is the end of the pipe main body 50, by brazing in the furnace. The length of the copper pipe 51 is longer than the length of the second small diameter portion 50b, and the end portion 51a on one side (lower side in FIG. 8) of the copper pipe 51 in the axial direction is more shaft than one end 50b1 of the second small diameter portion 50b. It is provided so as to extend to one side in the direction.

The outer peripheral surface 51b of the copper pipe 51, which is the surface to be connected to the joint 40, is made of the same material as the joint 40, and the copper pipe 51 and the joint 40 can be connected by hand brazing. At the time of connection, a second pipe composed of a pipe body 50 brazed in the furnace and a copper pipe 50 is inserted into the flared first large diameter portion 40a of the joint 40. More specifically, the second pipe is inserted into the first large diameter portion 40a from the end portion 51a on one side of the copper pipe 51 in the axial direction. At that time, the first inclined portion 40c of the joint 40 functions as a second positioning mechanism for determining the position of the copper pipe 50 with respect to the joint 40. The position of the copper pipe 50 with respect to the joint 40 is determined by the end portion 51a of the copper pipe 51 hitting the inner peripheral surface of the first inclined portion 40c. With the first inclined portion 40c, the position of the copper pipe 50 with respect to the joint 40 can be easily determined. When the first small diameter portion 40b of the joint 40 is inserted into the hole 36 formed in the pipe 23, the first inclined portion 40c determines the position of the joint 40 with respect to the pipe 23, similarly to the refrigerant pipe R1. It functions as a first positioning mechanism. The position of the joint 40 with respect to the pipe 23 can be easily determined by the first inclined portion 40c. In FIG. 8, reference numeral 28 indicates the brazing material used during brazing in the furnace, and reference numeral 29 indicates the brazing material used during manual brazing.

The piping main body 50 can be used as a service port, and is used for attaching functional parts such as a pressure sensor and filling the refrigerant during maintenance and inspection of the air conditioner A.

[Refrigerant piping R3 (third embodiment)]
FIG. 9 is a cross-sectional explanatory view of the refrigerant pipe R3 according to the third embodiment of the present disclosure, and FIG. 10 is an explanatory view of a joint of the refrigerant pipe R3 shown in FIG.
The refrigerant pipe R3 has a pipe 60 which is a first stainless steel pipe, a joint 61 which is a joint pipe provided on the outer peripheral surface of the pipe 60, and a pipe diameter smaller than that of the pipe 60, and is joined to the outer peripheral surface of the pipe 60. It is provided with a second pipe connected via 61. The second pipe of the refrigerant pipe R3 is composed of a stainless steel pipe body 62 and a copper pipe 63 which is a connection portion provided at the end of the pipe body 62. In the refrigerant pipe R3, the second pipe composed of the pipe main body 62 and the copper pipe 63 has a smaller pipe diameter than the pipe 60 which is the first pipe. The material of the joint 61 is copper, which is a material different from stainless steel, which is the material of the pipe 60. The outer peripheral surface 63a of the copper pipe 63, which is the surface to be connected to the joint 61, is made of the same material (copper) as the joint 61.

As shown in FIG. 10, the joint 61 has a short pipe shape. An annular bead 64 is formed near the center of the outer peripheral surface 61a of the joint 61 in the axial direction. As shown in FIG. 9, the bead 64 functions as a first positioning mechanism for determining the position of the joint 61 with respect to the pipe 60 when the joint 61 is inserted into the hole 65 formed in the pipe 60. The position of the joint 61 with respect to the pipe 60 is determined by the bead 64 hitting the peripheral edge of the hole 65. With such a bead 64, the position of the joint 61 with respect to the pipe 60 can be easily determined. The joint 61 is provided in the pipe 60 in a direction orthogonal to the pipe axis direction of the pipe 60.

The piping main body 62 has a second large diameter portion 62a, a second small diameter portion 62b having a diameter smaller than that of the second large diameter portion 62a, and a second connecting the second large diameter portion 62a and the second small diameter portion 62b. It is provided with an inclined portion 62c. The copper pipe 63 can be connected to the outer peripheral surface of the second small diameter portion 62b, which is the end of the pipe main body 62, by brazing in the furnace. The length of the second small diameter portion 62b is longer than the length of the copper pipe 63, and the end 62b1 on one side (lower side in FIG. 9) of the second small diameter portion 62b in the axial direction is axially longer than the one end 63b of the copper pipe 63. It is provided so as to extend to one side. If the brazing allowance between the joint 61 and the copper pipe 63 is secured, the length of the copper pipe 63 may be longer than the length of the second small diameter portion 62b of the pipe body 62.

An annular bead 66 is formed near the center of the outer peripheral surface 63a of the copper tube 63 in the axial direction. As shown in FIG. 9, the bead 66 is a second pipe with respect to the joint 61 when the second pipe composed of the pipe body 62 and the copper pipe 63 is inserted into the joint 61 provided in the pipe 60. It functions as a second positioning mechanism that determines the position of. The position of the second pipe with respect to the joint 61 is determined by the bead 66 hitting the peripheral edge of the opening of the joint 61. With such a bead 66, the position of the second pipe with respect to the joint 61 can be easily determined.

In the refrigerant pipe R3, the material of the joint 61 is copper, which is a material different from stainless steel, which is the material of the pipe 60. Further, the outer peripheral surface 63a of the copper pipe 63 constituting the second pipe, which is the surface to be connected to the joint 61, is made of the same material (copper) as the joint 61. The copper joint 61 and the stainless steel pipe 60 can be connected by brazing in a furnace. On the other hand, the copper joint 61 and the copper pipe 63 can be connected by hand brazing. In FIG. 9, reference numerals 43 and 44 indicate brazing materials used during brazing in the furnace, and reference numerals 45 indicate brazing materials used during manual brazing.

The piping main body 62 can be used as a service port, and is used for attaching functional parts such as a pressure sensor and filling the refrigerant during maintenance and inspection of the air conditioner A.

In the refrigerant pipe R3, the second pipe is connected to the pipe 60 so that the end 62b1 of the pipe main body 62 of the second pipe is located in the pipe 60. In other words, the entire end 62b1 of the pipe body 62 of the second pipe is located closer to the flow path P on which the refrigerant of the pipe 60 flows than the outer peripheral surface of the pipe 60 (see FIG. 9). The pipe body 62 and the copper pipe 63 of the second pipe overlap with the pipe 60 in the pipe radial direction of the second pipe. In the connection portion H1 (see FIG. 9) in which the joint 61 is connected to the pipe 60, the pipe body 62 and the copper pipe 63 of the second pipe overlap with the pipe 60 in the pipe radial direction of the second pipe. In this case, since the pipe body 62 of the second pipe is connected to the pipe 60 via the joint 61, at the connection portion H1 between the joint 61 and the pipe 60, the pipe of the second pipe is connected in the pipe radial direction of the second pipe. The main body 62, the copper pipe 63, and the joint 61 will be present. Further, the pipe body 62 is made of stainless steel and has higher rigidity than the copper pipe. Due to the presence of the pipe body 62 and the copper pipe 63, not only the strength of the connecting portion H1 between the joint 61 and the pipe 60 but also the strength of the first pipe and the first pipe via the joint 61 is compared with the case where only the joint 61 is present. 2 The strength of the pipe connection can be improved. If a part of the refrigerant pipe R3 contains a portion in which copper is present alone, stress is concentrated on that portion and causes damage. However, the refrigerant pipe R3 has a portion in which copper is present alone. Therefore, damage due to stress concentration can be suppressed.

[Refrigerant piping R4 (fourth embodiment)]
FIG. 11 is a cross-sectional explanatory view of the refrigerant pipe R4 according to the fourth embodiment of the present disclosure, and FIG. 12 is an explanatory view of a joint of the refrigerant pipe R4 shown in FIG.
The refrigerant pipe R4 has a pipe 70 which is a first stainless steel pipe, a joint 71 which is a joint pipe provided on the outer peripheral surface of the pipe 70, and a pipe diameter smaller than that of the pipe 70, and is joined to the outer peripheral surface of the pipe 70. It is provided with a second pipe connected via 71. The second pipe of the refrigerant pipe R4 is composed of a stainless steel pipe main body 72 and a copper pipe 73 which is a connection portion provided at the end of the pipe main body 72. In the refrigerant pipe R4, the second pipe composed of the pipe main body 72 and the copper pipe 73 has a smaller pipe diameter than the pipe 70 which is the first pipe. The material of the joint 71 is copper, which is a material different from stainless steel, which is the material of the pipe 70. The outer peripheral surface 73a of the copper pipe 73, which is the surface to be connected to the joint 71, is made of the same material (copper) as the joint 71.

As shown in FIG. 12, the joint 71 has a short pipe shape. The joint 71 has a first inclination that connects the first large diameter portion 71a, the first small diameter portion 71b having a diameter smaller than that of the first large diameter portion 71a, and the first large diameter portion 71a and the first small diameter portion 71b. It is provided with a portion 71c. A diameter-expanded portion 74 is formed by flaring at one end of the first large-diameter portion 71a in the axial direction. As shown in FIG. 10, the enlarged diameter portion 74 functions as a first positioning mechanism for determining the position of the joint 71 with respect to the pipe 70 when the joint 71 is inserted into the hole 75 formed in the pipe 70. The position of the joint 71 with respect to the pipe 70 is determined by the outer peripheral surface of the enlarged diameter portion 74 hitting the peripheral edge of the hole 75. With the enlarged diameter portion 74, the position of the joint 71 with respect to the pipe 70 can be easily determined. The joint 71 is provided in the pipe 70 in a direction orthogonal to the pipe axis direction of the pipe 70.

The piping main body 72 has a second large diameter portion 72a, a second small diameter portion 72b having a diameter smaller than that of the second large diameter portion 72a, and a second connecting the second large diameter portion 72a and the second small diameter portion 72b. It is provided with an inclined portion 72c. The copper pipe 73 can be connected to the outer peripheral surface of the second small diameter portion 72b, which is the end of the pipe main body 72, by brazing in the furnace. The length of the copper pipe 73 is longer than the length of the second small diameter portion 72b, and the end 73b on one side (lower side in FIG. 11) of the copper pipe 73 in the axial direction is axially longer than one end 72b1 of the second small diameter portion 72b. It is provided so as to extend to one side.

In the refrigerant pipe R4, the material of the joint 71 is copper, which is a material different from stainless steel, which is the material of the pipe 70. Further, the outer peripheral surface 73a of the copper pipe 73 constituting the second pipe, which is the surface to be connected to the joint 71, is made of the same material (copper) as the joint 71. The copper joint 71 and the stainless steel pipe 70 can be connected by brazing in a furnace. On the other hand, the copper joint 71 and the copper pipe 73 can be connected by hand brazing. For the connection between the joint 71 and the copper pipe 73, a second pipe composed of the pipe body 72 and the copper pipe 73 brazed in the furnace is inserted into the joint 71. At that time, the inclined portion 71c of the joint 71 functions as a second positioning mechanism for determining the position of the copper pipe 73 with respect to the joint 71. The position of the copper pipe 73 with respect to the joint 71 is determined by the end 73b of the copper pipe 73 hitting the inner peripheral surface of the inclined portion 71c. With the inclined portion 71c, the position of the second pipe with respect to the joint 71 can be easily determined. In FIG. 11, reference numerals 46 and 47 indicate the brazing materials used during brazing in the furnace, and reference numerals 48 indicate the brazing materials used during manual brazing.

The piping main body 72 can be used as a service port, and is used for attaching functional parts such as a pressure sensor and filling the refrigerant during maintenance and inspection of the air conditioner A.

In the refrigerant pipe R4, the second pipe is connected to the pipe 70 so that the end 72b1 of the pipe main body 72 of the second pipe is located in the pipe 70. In other words, the entire end 72b1 of the pipe body 72 of the second pipe is located closer to the flow path P on which the refrigerant of the pipe 70 flows than the outer peripheral surface of the pipe 70 (see FIG. 11). The pipe body 72 and the copper pipe 73 of the second pipe overlap with the pipe 70 in the pipe radial direction of the second pipe. In the connection portion H2 (see FIG. 11) where the joint 71 is provided in the pipe 70, the pipe body 72 and the copper pipe 73 of the second pipe overlap with the pipe 70 in the pipe radial direction of the second pipe. In this case, since the pipe body 72 of the second pipe is connected to the pipe 70 via the joint 71, at the connection portion H2 between the joint 71 and the pipe 70, the pipe of the second pipe is connected in the pipe radial direction of the second pipe. The main body 72, the copper pipe 73, and the joint 71 will be present. Further, the pipe body 72 is made of stainless steel and has higher rigidity than the copper pipe. Due to the presence of the pipe body 72 and the copper pipe 73, not only the strength of the connecting portion H2 between the joint 71 and the pipe 70 but also the strength of the first pipe and the first pipe via the joint 71 are compared with the case where only the joint 71 is present. 2 The strength of the pipe connection can be improved. If a part of the refrigerant pipe R4 contains a portion in which copper is present alone, stress is concentrated on that portion and causes damage. However, the refrigerant pipe R4 has a portion in which copper is present alone. Therefore, damage due to stress concentration can be suppressed.

[Action and effect of the embodiment]
In each of the above-described embodiments, the materials of the joints 40, 61, and 71 provided on the outer peripheral surfaces of the stainless steel pipes 23, 60, and 70 are copper, which is a material different from that of stainless steel. Further, the thin pipe 41 (fluid pipe R1) connected to the outer peripheral surfaces of the pipes 23, 60, 70 via the joints 40, 61, 71, the pipe main body 50 and the copper pipe 51 (hydrogen pipe R2), the pipe main body 62, and the pipe main body 62. The connected surfaces of the copper pipe 63 (fluid pipe R3) or the pipe main body 72 and the copper pipe 73 (refrigerator pipe R4) to the joints 40, 61, 71 are made of the same material as the joints 40, 61, 71. It is copper. Therefore, it is not necessary to braze the stainless steel pipe, which involves complicated work, and the second pipe, which is a thin pipe, can be easily connected to the first stainless steel pipe.

More specifically, when brazing a stainless steel tube, a passivation film (oxide film) is formed on the surface of the stainless steel. Therefore, in order to perform manual brazing such as torch brazing, the oxide film should be used. You need a flux to remove. In the refrigerating apparatus, since the refrigerant flows through the refrigerant circuit 3 which is a closed circuit, if the flux remains in the refrigerant pipe, the flux is mixed with the refrigerant, and the refrigerant itself or the compressor 4 or the like into which the refrigerant flows flows. It may adversely affect the performance of element parts. Therefore, the work of removing the flux after brazing is indispensable.

In each of the above-described embodiments, the stainless steel pipes 23, 60, 70 and the joints 40, 61, 71 can be connected by brazing in a furnace. This in-furnace brazing is a method of performing brazing in a predetermined gas atmosphere, for example, a hydrogen gas atmosphere in which an oxide film can be removed inside a continuous furnace or the like. Therefore, stainless steel can be brazed without using flux, and as a result, the work of removing the flux after brazing becomes unnecessary. Then, the joints 40, 61, 71, the thin pipe 41 (hydrogen pipe R1) which is the second pipe, the pipe main body 50 and the copper pipe 51 (fuel refrigerant pipe R2), the pipe main body 62 and the copper pipe 63 (fuel refrigerant pipe R3), or Since the connection between the pipe body 72 and the copper pipe 73 (fluid pipe R4) is a connection between coppers, flux treatment or the like is not required, and the second pipe is easily made of stainless steel via the joints 40, 61, 71. It can be connected to the pipes 23, 60, 70 made of the above.

Further, in each of the above-described embodiments, the joints 40, 61, and 71 are made of copper, and the thin pipe 41 (refrigerant pipe R1), the pipe body 50 and the copper pipe 51 (refrigerant pipe R2), the pipe body 62, and copper. The connected surfaces of the pipe 63 (refrigerant pipe R3) or the pipe main body 72 and the copper pipe 73 (refrigerant pipe R4) to the joints 40, 61, 71 are also made of copper. Therefore, the joints 40, 61, 71 can be connected to the thin pipe 41 and the copper pipes 51, 63, 73 by hand brazing, and the thin pipe 41 and the copper pipes 51, 63, 73 are easily made of stainless steel. Can be connected to the pipes 23, 60, 70 of.

Further, in the above-described embodiment (second to fourth embodiments), the second pipes connected to the stainless steel pipes 23, 60, 70 are the stainless steel pipe bodies 50, 62, 72 and the pipe body 50. , 62, 72 have copper pipes 51, 63, 73 which are connection portions provided at the ends, and these copper pipes 51, 63, 73 are connected to the joints 40, 61, 71. Includes outer peripheral surfaces 51b, 63a, 73a, which are surfaces. The second pipe is connected to the outer peripheral surfaces of the pipes 23, 60, 70 via joints 40, 61, 71 made of a material different from stainless steel, and copper provided on the pipe bodies 50, 62, 72 of the second pipe. The connected surfaces of the pipes 51, 63, 73 are made of the same material (copper) as the joints 40, 61, 71. Therefore, it is not necessary to braze the stainless steel pipes, which involves complicated work, and the copper pipes 51, 63, 73 can be easily connected to the stainless steel pipes 23, 60, 70.

Further, in the above-described embodiment (second to fourth embodiments), the piping main bodies 50, 62, 72 have a diameter larger than that of the second large diameter portions 50a, 62a, 72a and the second large diameter portions 50a, 62a, 72a. It has small second small diameter portions 50b, 62b, 72b. Further, copper pipes 51, 63, 73 as connecting portions are connected to the outer peripheral surfaces of the second small diameter portions 50b, 62b, 72b. Further, the outer peripheral surfaces 51b, 63a, 73a of the copper pipes 51, 63, 73 form a connected surface connected to the joints 40, 61, 71. The connected surface and the joints 40, 61, and 71 are made of the same material (copper), and the two can be easily connected by a conventional method such as hand brazing. Further, since the pipe bodies 50, 62, and 72 are made of stainless steel, the rigidity can be improved as compared with the copper pipe, and the cost can be reduced.

Further, in the above-described embodiment (first embodiment), the second pipe connected to the pipe 23 via the joint 40 is a copper thin pipe 41. The copper thin tube 41 and the copper joint 40 can be easily connected by a conventional method such as hand brazing.

Further, in each of the above-described embodiments, the inclined portion 40c, the bead 64, and the enlarged diameter portion 74, which are the first positioning mechanisms for determining the positions of the joints 40, 61, 71 with respect to the pipes 23, 60, 70, are the joints 40, 61. Since it is provided on the 71, the positions of the joints 40, 61, 71 with respect to the pipes 23, 60, 70 can be easily determined.

Further, in the above-described embodiments (first, second, and fourth embodiments), the joints 40 and 71 have inclined portions 40c and 71c which are second positioning mechanisms for determining the position of the second pipe with respect to the joints 40 and 71. doing. Further, in the above-described embodiment (third embodiment), the copper pipe 63 has a bead 66 which is a second positioning function for determining the position of the copper pipe 63 with respect to the joint 71. Thereby, the position of the second pipe with respect to the joints 40, 61, 71 can be easily determined.

Further, in the above-described embodiments (third and fourth embodiments), the pipe bodies 62 and 72 and the copper pipes 63 and 73 constituting the second pipe overlap with the pipes 60 and 70 in the pipe radial direction of the second pipe. ing. More specifically, in the connection portions H1 and H2 in which the joints 61 and 71 are provided in the pipes 60 and 70, the pipe bodies 62 and 72 of the second pipe and the copper pipes 63 and 73 are in the pipe diameter direction of the second pipe. It overlaps with the pipes 60 and 70. Since the pipe bodies 62 and 72 and the copper pipes 63 and 73 are connected to the pipes 60 and 70 via the joints 61 and 71, the second pipe is used in the connecting portions H1 and H2 between the joints 61 and 71 and the pipes 60 and 70. The pipe main bodies 62 and 72 of the second pipe, the copper pipes 63 and 73, and the joints 61 and 71 are present in the pipe radial direction of the second pipe. Further, the pipe bodies 62 and 72 are made of stainless steel and have higher rigidity than the copper pipe. Due to the presence of the pipe bodies 62 and 72 and the copper pipes 63 and 73, not only the strength of the connecting portions H1 and H2 between the joints 61 and 71 and the pipes 60 and 70 is increased as compared with the case where only the joints 61 and 71 are present. , The strength of the connection between the first pipe and the second pipe via the joints 61 and 71 can be improved. If a part of the refrigerant pipes R3 and R4 contains a portion in which copper is present alone, stress concentrates on the portion and causes damage. However, in the refrigerant pipes R3 and R4 of the present embodiment, copper is alone. Since it does not have a part existing in, it is possible to suppress damage due to stress concentration.

Further, the air conditioners A and B according to the above-described embodiment include a refrigerant circuit 3 including a plurality of element parts and a refrigerant pipe 8 for connecting the plurality of element parts, and connects the plurality of element parts. The refrigerant pipe 8 to be used includes the refrigerant pipe according to the first to fourth embodiments described above. In the refrigerant pipes according to the first to fourth embodiments, the materials of the joints 40, 61, and 71 provided on the outer peripheral surfaces of the stainless steel pipes 23, 60, and 70 are copper, which is a material different from that of stainless steel. Further, the thin pipe 41 (fluid pipe R1) connected to the outer peripheral surfaces of the pipes 23, 60, 70 via the joints 40, 61, 71, the pipe main body 50 and the copper pipe 51 (hydrogen pipe R2), the pipe main body 62, and the pipe main body 62. The connected surfaces of the copper pipe 63 (fluid pipe R3) or the pipe main body 72 and the copper pipe 73 (refrigerator pipe R4) to the joints 40, 61, 71 are made of the same material as the joints 40, 61, 71. It is copper. Therefore, it is not necessary to braze the stainless steel pipe, which involves complicated work, and the second pipe, which is a thin pipe, can be easily connected to the first stainless steel pipe.

[Other variants]
The present disclosure is not limited to the above-described embodiment, and various modifications can be made within the scope of the claims.
For example, in the above-described embodiment, a copper joint made of a material different from that of stainless steel is used as the joint provided on the outer peripheral surface of the first stainless steel pipe. Alternatively, an aluminum alloy can be used. When a copper alloy joint is used, the surface of the second pipe to be connected to the joint is made of copper alloy or copper, which is the same material as the copper alloy. When an aluminum joint is used, the surface of the second pipe to be connected to the joint is made of aluminum or an aluminum alloy, which is the same material as aluminum. When a joint made of an aluminum alloy is used, the surface to be connected to the joint of the second pipe is formed of an aluminum alloy or aluminum which is the same material as the aluminum alloy. As the copper alloy, for example, one containing 98% by weight or more of copper is used. More preferably, as the copper alloy, one containing 99% by weight or more of copper is used. Further, as the aluminum alloy, for example, an alloy containing 95% by weight or more of aluminum is used.

Further, in the above-described embodiment, when a stainless steel pipe body is used, the pipe body has a reduced diameter form and includes a second large diameter portion and a second small diameter portion. Not limited. For example, a second pipe may be a stainless steel pipe having a constant diameter that is not reduced in diameter and covered with a copper pipe.

Further, in the above-described embodiment (third embodiment and fourth embodiment), the second pipe is composed of the stainless steel pipe body and the copper pipe, but as in the first embodiment, the copper thin pipe is used. Can be used as the second pipe. In this case, the copper thin pipe, which is the second pipe, is connected to the outer peripheral surface of the pipe (first pipe) 60 via the joint 61, or is connected to the outer peripheral surface of the pipe (first pipe) 70 via the joint 71. Connected to a face.

Further, in the above-described embodiment, the outer peripheral surface of the copper tube functions as a connected surface, but as the connected surface, a copper-plated layer can be used as shown in FIG. FIG. 13 is a cross-sectional explanatory view of a modified example of the refrigerant pipe R4 shown in FIG. In such a modification, the elements or parts common to the refrigerant pipe R4 are designated by the same reference numerals as those of the refrigerant pipe R4, and the description thereof will be omitted for the sake of simplicity.

In the modified example shown in FIG. 13, a copper-plated layer 90 is used instead of the copper tube 73. The connection between the stainless steel pipe body 91, which is the second pipe on which the copper-plated layer 90 is formed, and the copper joint 92 can be manually brazed. Similar to the piping body 72 of the refrigerant pipe R4, the piping body 91 includes a second large diameter portion 91a, a second small diameter portion 91b having a diameter smaller than that of the second large diameter portion 91a, and a second large diameter portion 91a. It is provided with a second inclined portion 91c that connects to the second small diameter portion 91b. The copper-plated layer 90 is formed on the outer peripheral surface of the second small diameter portion 91b of the piping main body 91. The piping body does not have to have a small diameter portion. That is, a thin pipe having a constant pipe diameter can be used as the main body of the pipe, and in this case, a copper plating layer is formed on the outer peripheral surface of the thin pipe.

The joint 92 provided in the pipe 70 has a short pipe shape like the joint 71 of the refrigerant pipe R4. The joint 92 has an inclined portion 92c that connects the first large diameter portion 92a, the first small diameter portion 92b having a diameter smaller than that of the first large diameter portion 92a, and the first large diameter portion 92a and the first small diameter portion 92b. And have. A diameter-expanded portion 93 is formed by flaring at one end of the first large-diameter portion 92a in the axial direction. In FIG. 13, reference numeral 94 indicates the brazing material used during brazing in the furnace, and reference numeral 95 indicates the brazing material used during manual brazing.
Also in the refrigerant pipe R2 and the refrigerant pipe R3, a copper-plated layer formed on the outer peripheral surface of the second pipe can be used as the connected surface. Also in this case, the copper plating layer of the second pipe can be manually brazed to connect the copper joint 40 (refrigerant pipe R2) or the copper joint 61 (refrigerant pipe R3).

Further, in the above-described embodiment (third embodiment), the annular rib 64 is formed on the outer peripheral surface of the joint 61 as the first positioning mechanism, but the ribs are discontinuous with the outer peripheral surface along the circumferential direction. It can also be provided in. For example, three ribs can be provided at 120 ° intervals along the circumferential direction, and four ribs can be provided at 90 ° intervals along the circumferential direction. Similarly, in the above-described embodiment (third embodiment), the annular rib 66 is formed on the outer peripheral surface of the copper tube 63 as the second positioning mechanism, but the ribs are formed on the outer peripheral surface along the circumferential direction. It can also be provided discontinuously. For example, three ribs can be provided at 120 ° intervals along the circumferential direction, and four ribs can be provided at 90 ° intervals along the circumferential direction.

Further, in the above-described embodiment (fourth embodiment), the inclined portion 71c of the joint 71 is used as the second positioning mechanism for determining the position of the second pipe with respect to the joint 71, but other configurations can also be used. .. For example, a short pipe-shaped joint 80 as shown in FIG. 14 may be adopted as the joint, and the annular rib 81 provided on the inner peripheral surface of the joint 80 may be used as the second positioning mechanism. When the second pipe 82 is inserted into the joint 80, the tip 82a of the second pipe 82 abuts on the rib 81, and its axial movement is restricted. Thereby, the position of the second pipe 82 with respect to the joint 80 can be easily determined. At one end of the joint 80 in the axial direction, a diameter-expanded portion 83 that functions as a first positioning mechanism for determining the position of the joint 80 with respect to the first pipe (not shown) is formed by flaring. As for the rib 81, similarly to the rib 64 or the rib 66 described above, a plurality of ribs can be discontinuously provided on the inner peripheral surface of the joint 80 along the circumferential direction.

Further, in the above-described embodiment, the copper thin tube 41 is connected to the stainless steel pipe 23 via the copper joint 40, and the thin tube 41 is used as a service port. Similarly, the stainless steel pipe 21 is connected to stainless steel. It is also possible to connect a thin tube made of the different material through a joint made of a different material from the above, and to connect a high pressure sensor to the thin tube. Further, a thin tube made of a different material can be connected to the stainless steel pipe 22 via a joint made of a material different from that of stainless steel, and a low voltage sensor can be connected to the thin tube. Further, a thin tube made of a different material may be connected to the stainless steel pipe 24 via a joint made of a material different from that of stainless steel, and this thin tube may be used as a charge port for the refrigerant.

Further, in the above-described embodiment, a separate type or separate type air conditioner in which the indoor unit and the outdoor unit are separated has been exemplified, but the air conditioner which is the refrigerating device of the present disclosure is not limited to this. The refrigerating apparatus of the present disclosure also includes a type of air conditioner in which a compressor, a condenser, an evaporator, a fan, etc., which are element components of the air conditioner, are housed in an integrated casing.
Further, in the above-described embodiment, the accumulator is provided on the suction side of the compressor, but an air conditioner that does not have such an accumulator can also be used.

1: Indoor unit 2: Outdoor unit 2a: Casing 3: Coolant circuit 4: Compressor 4a: Suction part 4b: Discharge part 5: Indoor heat exchanger 6: Electronic expansion valve 7: Outdoor heat exchanger 8: Coolant piping 9: Indoor fan 10: Outdoor fan 11: Accumulator 12: Oil separator 13: Valve 14: Oil return pipe 15: Muffler 16: Four-way switching valve 17: Gas closing valve 18: Liquid closing valve 21: Piping 22: Piping 23: Piping 24: Piping 31: 1st port 32: 2nd port 33: 3rd port 34: 4th port 36: Hole 40: Joint 40a: 1st large diameter portion 40b: 1st small diameter portion 40c: 1st inclined portion 41: Thin pipe 50: Piping body 50a: Second large diameter portion 50b: Second small diameter portion 50c: Second inclined portion 51: Copper pipe 60: Piping 61: Joint 62: Piping body 62a: Second large diameter portion 62b: Second small diameter Part 62c: Second inclined portion 63: Copper pipe 64: Bead 65: Hole 66: Bead 70: Piping 71: Joint 71a: First large diameter portion 71b: First small diameter portion 71c: First inclined portion 72: Piping body 72a : 2nd large diameter portion 72b: 2nd small diameter portion 72c: 2nd inclined portion 73: Copper pipe 74: Expanded diameter portion 75: Hole 80: Joint 81: Rib 82: 2nd pipe 83: Expanded diameter portion 90: Copper plating Layer A: Air conditioner (refrigerator)
B: Air conditioner (refrigerator)
C: Switching mechanism P: Flow path (of refrigerant) R1: Refrigerant piping (first embodiment)
R2: Refrigerant piping (second embodiment)
R3: Refrigerant piping (third embodiment)
R4: Refrigerant piping (4th embodiment)

Claims (9)

The first stainless steel pipe (23, 60, 70) through which the refrigerant flows inside,
Joint pipes (40, 61, 71, 92 ) provided on the outer peripheral surface of the first pipe (23, 60, 70) and made of a material different from stainless steel, and
The pipe diameter is smaller than that of the first pipe (23, 60, 70), and is connected to the outer peripheral surface of the first pipe (23, 60, 70) via the joint pipe (40, 61, 71, 92). The joint pipe of the second pipe (50 , 51, 62, 63, 72, 73, 90, 91 ) is provided with the second pipe (50 , 51, 62, 63, 72, 73, 90, 91). (40,61,71, 92) to be connected surface with (51b, 63a, 73a) is the joint pipe (40,61,71, 92) and a same material,
The second pipe (50 , 51, 62, 63, 72, 73, 90, 91 ) includes a stainless steel pipe body (50 , 62, 72, 91 ) and the pipe body (50 , 62, 72, 91). ), And has a connection (51 , 63, 73, 90 ) made of a pipe (51, 63, 73) or a plating layer (90), which is made of a material different from stainless steel. Refrigerant pipes (R2, R3, R4) of the refrigerating apparatus (A, B) in which the portions (51 , 63, 73, 90) include the connected surfaces (51b, 63a, 73a). The joint pipes (40 , 61, 71, 92 ) are provided in the first pipe (23, 60, 70) in a direction orthogonal to the pipe axis direction of the first pipe (23, 60, 70). The refrigerant pipes (R2, R3, R4) of the refrigerating apparatus (A, B) according to claim 1. The connected surfaces (51b, 63a, 73a) of the joint pipe (40 , 61, 71, 92 ) and the second pipe (50 , 51, 62, 63, 72, 73, 90, 91) are copper or copper alloy. The refrigerant pipes (R2, R3, R4) of the refrigerating apparatus (A, B) according to claim 1 or 2, comprising the same. The piping main body (50, 62, 72) has a second large diameter portion (50a, 62a, 72a) and a second small diameter portion (50b, 62b) having a smaller diameter than the second large diameter portion (50a, 62a, 72a). 72b), and the connecting portion (51, 63, 73) is a pipe (51, 63, 73) provided on the outer peripheral surface of the second small diameter portion (50b, 62b, 72b). The refrigerant pipes (R2, R3, R4) of the refrigerating apparatus (A, B) according to any one of 1 to 3. The first positioning mechanism (40c, 64 , 74, 93 ) that determines the position of the joint pipe (40, 61, 71, 92 ) with respect to the first pipe (23, 60, 70) is the joint pipe (40, 61, 93). The refrigerant pipes (R2, R3, R4) of the refrigerating apparatus (A, B) according to any one of claims 1 to 4, which are provided on the outer peripheral surface of 71 , 92). The joint pipe (40 , 61, 71, 92 ) or the second pipe (50 , 51, 62, 63, 72, 73, 90, 91 ) is the second pipe (40, 61, 71, 92 ) with respect to the joint pipe (40, 61, 71, 92). 2. According to any one of claims 1 to 5, having a second positioning mechanism (40c, 66 , 71c, 92c ) for determining the position of two pipes (50 , 51, 62, 63, 72, 73, 90, 91). Refrigerant pipes (R2, R3, R4) of the refrigerating apparatus (A, B) described. The second pipe (62 , 63, 72, 73, 90, 91 ) is the first pipe (60, 70) in the pipe radial direction of the second pipe (62 , 63, 72, 73, 90, 91). The refrigerant pipes (R3, R4) of the refrigerating apparatus (A, B) according to any one of claims 1 to 6, which overlap with the above. Said second pipe (62,63,72,73, 90, 91) pipe body (62, 72, 91) of tube diameter direction of the second pipe (62,63,72,73, 90, 91) The refrigerant pipe (R3, R4) of the refrigerating apparatus (A, B) according to any one of claims 1 to 7, which overlaps with the first pipe (60, 70). It is provided with a refrigerant circuit (3) including a plurality of element parts and a refrigerant pipe (8) for connecting the plurality of element parts.
The refrigerating apparatus (A, B) in which the refrigerant pipe (8) connecting the plurality of element components includes the refrigerant pipe (R2, R3, R4) according to any one of claims 1 to 8. ).

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