JP6885452B2 - Refrigerant piping and refrigerating equipment - Google Patents

Description

The present disclosure relates to refrigerant piping and refrigerating equipment.

In heat pump type refrigerating equipment such as air conditioners, element parts such as compressors, oil separators, four-way switching valves, heat source side heat exchangers, expansion mechanisms, user side heat exchangers, accumulators, and closing valves are connected by refrigerant piping. It is equipped with a connected refrigerant circuit. Generally, a copper pipe is used for the refrigerant pipe. However, since the material cost of the copper pipe is high, it is considered to use a refrigerant pipe made of relatively inexpensive stainless steel (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2010-151327

When stainless steel refrigerant pipes are used as part of the refrigerant circuit, manual brazing of the stainless steel refrigerant pipes and copper refrigerant pipes occurs during the manufacture of refrigerating equipment and maintenance such as parts replacement. I have something to do. However, brazing of a stainless steel refrigerant pipe requires work such as removing an oxide film on the surface, which complicates the work.

An object of the present disclosure is to facilitate the connection between a refrigerant pipe made of stainless steel and a refrigerant pipe made of a material other than stainless steel.

(1) The refrigerant piping of the present disclosure is
Refrigerant piping that constitutes the refrigerant circuit of the refrigerator.
Equipped with a first pipe and a second pipe,
The first pipe has a pipe body made of stainless steel and a connecting pipe provided at an end portion of the pipe body in the pipe axial direction and made of a material different from stainless steel.
The connecting pipe has a protruding portion protruding in the pipe axis direction from the end portion of the piping body.
The second pipe is made of the same material as the connecting pipe, and has a second large diameter portion arranged at an end in the pipe axial direction, a second small diameter portion having a diameter smaller than that of the second large diameter portion, and the above. It is provided with a stepped portion arranged between the second large diameter portion and the second small diameter portion.
The connecting pipe is inserted into the second large diameter portion, and the connecting pipe is inserted into the second large diameter portion.
The protruding portion comes into contact with the stepped portion,
The outer peripheral surface of the connecting pipe is connected to the inner peripheral surface of the second large diameter portion.

According to this configuration, the first pipe of the refrigerant pipe has a pipe body made of stainless steel and a connecting pipe made of a material different from stainless steel provided at the end of the pipe body, and the connecting pipe is connected to the connecting pipe. A second pipe made of the same material as the above is connected. Therefore, brazing of stainless steel becomes unnecessary, and the first pipe and the second pipe can be easily connected.

(2) The refrigerant piping of the present disclosure is
Refrigerant piping that constitutes the refrigerant circuit of the refrigerator.
Equipped with a first pipe and a second pipe,
The first pipe has a pipe body made of stainless steel and a connecting pipe provided at an end portion of the pipe body in the pipe axial direction and made of a material different from stainless steel.
The connecting pipe has a protruding portion protruding in the pipe axis direction from the end portion of the piping body.
The second pipe is made of the same material as the connecting pipe and has a second large diameter portion arranged at the end in the pipe axis direction and a second small diameter portion having a diameter smaller than that of the second large diameter portion. A portion and a step portion arranged between the second large-diameter portion and the second small-diameter portion are provided.
The connecting pipe is inserted into the second large diameter portion, and the connecting pipe is inserted into the second large diameter portion.
The protruding portion comes into contact with the stepped portion,
The outer peripheral surface of the connecting pipe is connected to the inner peripheral surface of the second large diameter portion.

According to this configuration, the first pipe of the refrigerant pipe has a pipe body made of stainless steel and a connecting pipe made of a material different from stainless steel provided at the end of the pipe body, and the connecting pipe is connected to the connecting pipe. And a second pipe made of the same material as the main component are connected. Therefore, brazing of stainless steel becomes unnecessary, and the first pipe and the second pipe can be easily connected.

(3) Preferably, the connecting pipe and the second pipe are made of different materials having the same main component.
In this way, even when the connecting portion and the second pipe are made of different materials having the same main component, the first pipe and the second pipe can be easily connected.

(4) Preferably, each of the connecting pipe and the second pipe is made of copper, a copper alloy, aluminum, or an aluminum alloy.
According to this configuration, the connecting pipe and the second pipe can be easily connected by brazing using an inexpensive brazing material.

(5) Preferably, the end portion of the pipe body and the second large diameter portion are arranged so as to overlap each other in the pipe radial direction.
According to this configuration, in the first pipe, the stainless steel pipe body and the connecting pipe made of a material other than stainless steel are, for example, brazed in a furnace in a hydrogen reduction environment in order to remove the oxide film of the pipe body. Can be connected in a high temperature environment. However, when a material other than stainless steel such as copper is exposed to a high temperature environment, the strength may decrease. Therefore, by overlapping the stainless steel pipe body and the second pipe in the pipe radial direction, the connecting pipe having reduced strength does not exist independently in the refrigerant pipe, and the strength of the connecting pipe is reduced. And the second pipe can be supplemented.

(6) Preferably, the piping main body includes a first small diameter portion and a first large diameter portion having a diameter larger than that of the first small diameter portion, and the connecting pipe is provided on the outer peripheral surface of the first small diameter portion. Provided.

(7) Preferably, the second small diameter portion of the second pipe and the first large diameter portion of the pipe body have the same outer diameter.
In the manufacturing process of the refrigerating apparatus, when the refrigerant pipe is connected by brazing, the refrigerant pipe is bent, or the like, a jig may be used to fix or hold the refrigerant pipe. As in the above configuration, by setting the first large diameter portion of the first pipe and the second small diameter portion of the second pipe to have the same outer diameter, it is possible to fix them using a common jig. This makes it possible and the manufacturing work can be easily performed.

(8) Preferably, the second small diameter portion of the second pipe and the first large diameter portion of the pipe body have the same inner diameter.
With such a configuration, it is possible to suppress the pressure fluctuation of the refrigerant flowing in the refrigerant pipe.

(9) Preferably, the opening of the second large diameter portion of the second pipe is arranged upward.
With such a configuration, it is easy to pour the brazing material between the inner peripheral surface of the second large diameter portion of the second pipe and the outer peripheral surface of the connecting pipe of the first pipe, and the connection between the first pipe and the second pipe is made easy. Can be facilitated.

(10) Preferably, the second pipe is provided in the element component constituting the refrigerant circuit.

(11) Preferably, the element component is a compressor.

(12) Preferably, the first pipe constitutes a joint connecting the second pipe and another stainless steel pipe.
With such a configuration, the first pipe can be miniaturized, and the work of providing a connection portion on the pipe main body can be easily performed.

(13) The refrigerating device of the present disclosure is
The refrigerant pipe according to any one of (1) to (12) above, and
It constitutes a refrigerant circuit and includes element parts to which the refrigerant pipe is connected.

It is a schematic block diagram of the refrigerating apparatus provided with the refrigerant pipe which concerns on 1st Embodiment. It is sectional drawing which shows the connection part of the 1st pipe and the 2nd pipe of a refrigerant pipe. It is an enlarged sectional view of the part A of FIG. It is sectional drawing which shows the connection part of the 1st pipe and the 2nd pipe of the refrigerant pipe which concerns on 2nd Embodiment. It is sectional drawing which shows the state before brazing of the pipe main body of the 1st pipe and a connection pipe. It is sectional drawing which shows the modification of the pipe main body. It is sectional drawing which shows the further deformation example of a pipe body. It is sectional drawing which shows the further deformation example of a pipe body. It is sectional drawing which shows the further deformation example of a pipe body. It is sectional drawing which shows the connection part of the 1st pipe and the 2nd pipe of the refrigerant pipe which concerns on 3rd Embodiment. It is sectional drawing which shows the connection part of the 1st pipe and the 2nd pipe of the refrigerant pipe which concerns on 4th Embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.
[First Embodiment]
[Overall configuration of refrigeration equipment]
Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a refrigerating apparatus provided with a refrigerant pipe according to the first embodiment.
The refrigerating device 1 is, for example, an air conditioner for adjusting indoor temperature and humidity, and includes an outdoor unit 2 installed outdoors and an indoor unit 3 installed indoors. The outdoor unit 2 and the indoor unit 3 are connected to each other by a refrigerant pipe 10.

The refrigerating apparatus 1 includes a refrigerant circuit 4 that performs a vapor compression refrigerating cycle. The refrigerant circuit 4 includes a plurality of element parts and a refrigerant pipe 10 for connecting the plurality of element parts. The refrigerant circuit 4 includes an indoor heat exchanger 11, a compressor 12, a muffler 13, an outdoor heat exchanger 14, an expansion mechanism 15, an accumulator 16, a four-way switching valve 17, a closing valve 18L, 18G, and the like as element parts. These are connected by a refrigerant pipe 10. The refrigerant pipe 10 includes a liquid pipe 10L and a gas pipe 10G. The liquid pipe 10L and the gas pipe 10G are provided with closing valves 18L and 18G, respectively.

The indoor heat exchanger 11 is provided in the indoor unit 3 and exchanges heat between the refrigerant and the indoor air. As the indoor heat exchanger 11, 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 11, an indoor fan (not shown) for blowing indoor air to the indoor heat exchanger 11 and sending conditioned air into the room is provided.

The compressor 12, the muffler 13, the outdoor heat exchanger 14, the expansion mechanism 15, the accumulator 16, the four-way switching valve 17, and the closing valves 18L and 18G are provided in the outdoor unit 2. The compressor 12 compresses the refrigerant sucked from the suction pipe and discharges it from the discharge pipe. As the compressor 12, for example, various compressors such as a scroll compressor can be adopted.

The muffler 13 suppresses the pressure pulsation of the refrigerant discharged from the compressor 12. An oil separator may be provided between the discharge pipe of the compressor 12 and the four-way switching valve 17 in place of or in addition to the muffler 13. The oil separator separates the lubricating oil from the mixed fluid of the lubricating oil and the refrigerant discharged from the compressor 12.

The outdoor heat exchanger 14 exchanges heat between the refrigerant and the outdoor air. As the outdoor heat exchanger 14, for example, a cross-fin type fin-and-tube heat exchanger, a microchannel heat exchanger, or the like can be adopted. An outdoor fan for blowing outdoor air to the outdoor heat exchanger 14 is provided in the vicinity of the outdoor heat exchanger 14.

The expansion mechanism 15 is arranged between the outdoor heat exchanger 14 and the indoor heat exchanger 11 in the refrigerant pipe 10 of the refrigerant circuit 4, expands the inflowing refrigerant, and reduces the pressure to a predetermined pressure. As the expansion mechanism 15, for example, an electronic expansion valve having a variable opening degree or a capillary tube can be adopted.

The accumulator 16 is arranged between the suction port of the compressor 12 and the four-way switching valve 17 in the refrigerant circuit 4, and separates the inflowing refrigerant into gas and liquid. The gas refrigerant separated by the accumulator 16 is sucked into the compressor 12.

The four-way switching valve 17 can be switched between the first state shown by the solid line and the second state shown by the broken line in FIG. When the air conditioner 1 performs the cooling operation, the four-way switching valve 17 is switched to the first state, and when the air conditioning device 1 performs the heating operation, the four-way switching valve 17 is switched to the second state.

[Composition of refrigerant piping]
FIG. 2 is a cross-sectional view showing a connecting portion between the first pipe and the second pipe of the refrigerant pipe.
The refrigerant pipe 10A shown in FIG. 2 is connected to at least one element component X among the plurality of element components described above. The refrigerant pipe 10A has a first pipe 21 and a second pipe 22. The first pipe 21 and the second pipe 22 have the same axis O. In the present embodiment, the axis O is arranged in the vertical direction (vertical direction). In the following description, the direction along the axis O is also referred to as "tube axial direction". The radial direction centered on the axis O is also referred to as the "pipe radial direction".

(1st pipe)
The first pipe 21 has a pipe main body 21a and a connecting pipe 21b. The piping main body 21a and the connecting pipe 21b are separate members.
The piping body 21a is made of stainless steel. The piping main body 21a is formed of, for example, SUS304, SUS304L, SUS436L, SUS430, or the like.

The piping main body 21a has a first large diameter portion 21a2, a first step portion 21a3, and a first small diameter portion 21a1 arranged side by side in the pipe axis direction. In the example shown in FIG. 2, the first small diameter portion 21a1 is arranged at one end (lower portion) of the pipe main body 21a in the pipe axial direction. The first step portion 21a3 is arranged above the first small diameter portion 21a1. The first large diameter portion 21a2 is arranged above the first step portion 21a3.

The pipe body 21a forms a first small diameter portion 21a1 and a first step portion 21a3 by reducing one end of a pipe having an outer diameter D in the pipe axial direction in the pipe radial direction, and the diameter is not reduced. The portion is the first large diameter portion 21a2.

The connecting pipe 21b is made of a material different from that of the pipe main body 21a. The connecting pipe 21b of this embodiment is made of copper. As used herein, the term "copper" is "pure copper" containing 99.9% by weight or more of copper as a main component. The connecting pipe 21b is a straight pipe having a constant outer diameter and inner diameter. The length of the connecting pipe 21b in the pipe axis direction is shorter than the length of the pipe body 21a in the pipe axis direction. The length of the connecting pipe 21b in the pipe axis direction is longer than the length of the first small diameter portion 21a1 of the pipe body 21a in the pipe axis direction. The inner diameter of the connecting pipe 21b is slightly larger than the outer diameter of the first small diameter portion 21a1.

The first small diameter portion 21a1 of the pipe body 21a is inserted inside the connecting pipe 21b in the pipe radial direction. The inner peripheral surface of the connecting pipe 21b and the outer peripheral surface of the first small diameter portion 21a1 are arranged so as to face each other in the pipe radial direction. The inner peripheral surface of the connecting pipe 21b and the outer peripheral surface of the first small diameter portion 21a1 are brazed by the first brazing material B1. In addition, in FIG. 2 and FIGS. 3 to 11 described below, the thickness of the first brazed material B1 in the pipe radial direction is exaggerated in order to show the brazed portion in an easy-to-understand manner. The same applies to the second brazing material B2, which will be described later.

FIG. 3 is an enlarged cross-sectional view of part A in FIG.
The inner peripheral surface of the connecting pipe 21b and the outer peripheral surface of the first small diameter portion 21a1 are connected by "brazing in a furnace". This is due to the following reasons.
First, since stainless steel, which is the material of the piping body 21a, has a passivation film (oxide film) formed on its surface, manual brazing such as torch brazing (hereinafter, also referred to as "hand brazing") is performed. To do this, a flux is required to remove the oxide film. Since the refrigerant flows through the refrigerant circuit 4 which is a closed circuit, if the flux remains in the refrigerant pipe 10A, the flux is mixed with the refrigerant, and the refrigerant itself and the element component X into which the refrigerant flows (for example, a compressor) 12) may adversely affect the performance. Therefore, the work of removing the flux after brazing is indispensable.

Stainless steel, which is the material of the pipe body 21a, undergoes embrittlement called sensitization when heat is applied. Sensitization is a phenomenon in which chromium is bonded to carbon in stainless steel and chromium is precipitated at grain boundaries to form a portion having a low chromium component, resulting in a decrease in corrosion resistance and the like. This sensitization is known in the temperature range where it is likely to occur and the heat application time.

In-furnace brazing is a method of 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, it is possible to braze stainless steel without using flux. Therefore, the work of removing the flux after brazing becomes unnecessary. In the brazing in the furnace, the brazing temperature and the brazing time can be easily controlled, so that the brazing can be performed at a temperature and time at which the occurrence of sensitization can be suppressed. By using SUS304L, which has a smaller amount of carbon than SUS304, as the pipe body 21a, it is possible to suppress the sharpening of the pipe body 21a.

The connecting pipe 21b has a protruding portion 21b1 protruding in the pipe axis direction from the first small diameter portion 21a1 which is an end portion of the pipe main body 21a. The protrusion amount T1 of the protrusion 21b1 is, for example, 0.1 mm or more and 25 mm or less. Preferably, the protrusion amount T1 is 1.0 mm or more and 5.0 mm or less. More preferably, the protrusion amount T1 is 2.0 mm or more and 3.0 mm or less. The protrusion amount T1 of the present embodiment is smaller than the overlap amount R1 of the pipe body 21a and the connecting pipe 21b in the pipe radial direction. The overlapping amount R1 is, for example, 7.0 mm.

(2nd pipe)
As shown in FIGS. 2 and 3, the second pipe 22 is connected to one end of the first pipe 21 in the pipe axial direction. The second pipe 22 protrudes from the element component X such as the compressor 12 and constitutes a part of the element component X and a part of the refrigerant pipe 10A. The second pipe 22 of the present embodiment is made of a material different from that of the pipe main body 21a of the first pipe 21, and is made of the same material as the connecting pipe 21b. The second pipe 22 of this embodiment is made of copper.

The second pipe 22 has a second large diameter portion 22a, a second step portion 22c, and a second small diameter portion 22b arranged side by side in the pipe axis direction. The second large diameter portion 22a is arranged at one end (upper portion) of the second pipe 22 in the pipe axial direction. The second small diameter portion 22b is arranged at the other end (lower portion) of the second pipe 22 in the pipe axial direction. The lower end of the second small diameter portion 22b is directly connected to the element component X. A second step portion 22c is arranged between the second large diameter portion 22a and the second small diameter portion 22b.

In the second pipe 22, a second large diameter portion 22a and a second step portion 22c are formed by enlarging one end of a pipe having an outer diameter D in the pipe radial direction, and the portion whose diameter is not expanded is the second portion. 2 The small diameter portion 22b is used.

The second large diameter portion 22a is arranged so that the opening faces upward. The inner diameter of the second large diameter portion 22a is slightly larger than the outer diameter of the connecting pipe 21b in the first pipe 21. Then, the connecting pipe 21b of the first pipe 21 is inserted inside the second large diameter portion 22a in the pipe radial direction. The inner peripheral surface of the second large-diameter portion 22a and the outer peripheral surface of the connecting pipe 21b are arranged so as to face each other in the pipe radial direction. The protruding portion 21b1 of the connecting pipe 21b is in contact with the second step portion 22c of the second pipe 22.

The inner peripheral surface of the second large diameter portion 22a and the outer peripheral surface of the connecting pipe 21b are brazed by the second brazing material B2. This brazing is manual brazing such as torch brazing (burner brazing). Since both the connecting pipe 21b of the first pipe 21 and the second pipe 22 are made of copper, they can be easily connected by brazing using an inexpensive brazing material such as phosphor copper brazing.

The first pipe 21 and the second pipe 22 are relatively positioned with respect to the pipe axial direction when the protruding portion 21b1 of the connecting pipe 21b comes into contact with the second step portion 22c of the second pipe 22. As a result, the brazing work can be performed more easily.

As shown in FIG. 3, the connecting pipe 21b overlaps with the second pipe 22 in the pipe radial direction in the range indicated by R2. The overlapping amount R2 has substantially the same dimensions as the overlapping amount R1 between the connecting pipe 21b and the pipe main body 21a. The connecting pipe 21b protrudes from the second pipe 22 in the pipe axis direction. The protruding amount T2 of the connecting pipe 21b is smaller than the overlapping amount R2. The protrusion amount T2 is, for example, 2 mm or more and 3 mm or less.

The lower end of the pipe body 21a of the first pipe 21 and the upper end of the second pipe 22 overlap in the pipe radial direction. The amount of overlap R3 between the pipe main body 21a and the second pipe 22 is, for example, 5.0 mm. The connecting pipe 21b is placed in a high temperature environment in the furnace when brazing with the pipe main body 21a. Therefore, the strength of the connecting pipe 21b may decrease due to the coarsening of copper crystal grains. In the present embodiment, since the pipe main body 21a and the second pipe 22 are arranged so as to overlap each other in the pipe radial direction, the connecting pipe 21b having a reduced strength does not exist alone in the refrigerant pipe 10A. In other words, the connecting pipe 21b overlaps with at least one of the pipe main body 21a and the second pipe 22 in the pipe radial direction. Therefore, the decrease in the strength of the connecting pipe 21b is compensated by the pipe main body 21a and the second pipe 22.

In the present embodiment, the connecting pipe 21b of the first pipe 21 has a protruding portion 21b1 protruding from the pipe main body 21a in the pipe axis direction, but in FIG. 3, the connecting pipe 21b is tentatively shortened in the pipe axis direction. Then, assuming that the connecting pipe 21b is retracted upward without protruding from the pipe main body 21a, the pipe between the second large diameter portion 22a of the second pipe 22 and the lower end portion of the first small diameter portion 21a1 of the first pipe 21. A slight space is created between the radial directions, and the amount of overlap R2 between the connecting pipe 121b and the second pipe 122 is also reduced. Therefore, the connection strength between the connection pipe 121b and the second pipe 122 may decrease.

In the present embodiment, as shown in FIG. 3, since the connecting pipe 21b has a protruding portion 21b1 protruding from the pipe main body 21a in the pipe axis direction, it is between the second pipe 22 and the first pipe 21. No space is formed in the pipe, and the amount of overlap R2 between the connection pipe 21b and the second pipe 22 can be increased to increase the connection strength between the first pipe 21 and the second pipe 22.

As the second brazing material B2, a material having a melting point lower than that of the first brazing material B2 is used. Therefore, for example, when the element component X is replaced, the connecting portion between the first pipe 21 and the second pipe 22 is set at a temperature higher than the melting point of the second brazing material B2 and lower than the melting point of the first brazing material B1. By heating, only the second brazing material B2 can be melted without melting the first brazing material B1, and the second pipe 22 can be removed from the first pipe 21. Therefore, in the first pipe 21, the connection pipe 21b remains connected to the pipe body 21a, and the second pipe 22 of the new element component X can be connected to the connection pipe 21b.

The first large diameter portion 21a2 of the first pipe 21 and the second small diameter portion 22b of the second pipe 22 have a common outer diameter D. Therefore, in the manufacturing process of the refrigerating apparatus 1, the jigs used for fixing, holding, handling, etc. of each pipe can be standardized. If the inner diameter of the first large diameter portion 21a2 and the inner diameter of the second small diameter portion 22b are common, the pressure fluctuation of the refrigerant flowing through the refrigerant pipe 10A can be reduced.

The pipe body 21a of the first pipe 21 is made of stainless steel and has higher strength than the second pipe 22 made of copper. Therefore, the wall thickness of the pipe main body 21a can be made thinner than that of the second pipe 22. In this case, the inner diameter of the first large-diameter portion 21a2 of the pipe main body 21a is larger than the inner diameter of the second small-diameter portion 22b of the second pipe 22, which is slightly disadvantageous in terms of suppressing the pressure fluctuation of the refrigerant. The weight of the refrigerant pipe 10A can be reduced and the ease of processing can be improved.

[Second Embodiment]
FIG. 4 is a cross-sectional view showing a connecting portion between the first pipe and the second pipe of the refrigerant pipe according to the second embodiment.
The refrigerant pipe 10A of the present embodiment has a third pipe 23 in addition to the first pipe 21 and the second pipe 22. The third pipe 23 has the same axis O as the first pipe 21 and the second pipe 22.

The first pipe 21 of the present embodiment is formed shorter in the pipe axis direction than the first pipe 21 of the first embodiment. The first pipe 21 is arranged between the second pipe 22 and the third pipe 23 in the pipe axial direction. Therefore, the first pipe 21 of the present embodiment has a function as a joint for connecting the second pipe 22 and the third pipe 23.

The third pipe 23 is connected to the first large diameter portion 21a2 in the pipe main body 21a of the first pipe 21. The third pipe 23 is made of stainless steel, which is the same material as the pipe main body 21a. The pipe main body 21a and the third pipe 23 are connected by welding such as TIG welding. However, the pipe main body 21a and the third pipe 23 may be connected by brazing. The third pipe 23 has the same outer diameter D as the first large diameter portion 21a2 of the pipe main body 21a.

In the first pipe 21 in the refrigerant pipe 10A of the first embodiment described above, since the first large diameter portion 21a2 of the pipe body 21a is formed long in the pipe axis direction, the first pipe 21 becomes large and the pipe body 21a The handling of the first pipe 21 becomes complicated when the connection pipe 21b is brazed in the furnace or the like. The first pipe 21 of the present embodiment makes the first pipe 21 smaller by forming the pipe body 21a short and using the first pipe 21 itself as a "joint" connecting the second pipe 22 and the third pipe 23. This makes it easier to perform brazing work in the furnace. Further, by downsizing the first pipe 21, the number of the first pipes 21 that can be put into the furnace at one time can be increased, so that the production efficiency can be improved.

FIG. 5 is a cross-sectional view showing a state before brazing between the pipe main body of the first pipe and the connecting pipe.
In the present embodiment, in order to braze the pipe body 21a and the connecting pipe 21b, first, a ring brazing Ba to be the first brazing material B1 is placed outside the first small diameter portion 21a1 of the pipe body 21a in the pipe radial direction. Fit. Next, the connecting pipe 21b is fitted to the outside of the first small diameter portion 21a1 in the pipe radial direction, and the ring wax Ba is sandwiched between the connecting pipe 21b and the first stepped portion 21a3. With the piping body 21a on the upper side and the connecting pipe 21b on the lower side, the ring wax Ba is melted by putting the piping body 21a and the connecting pipe 21b into a high-temperature furnace, and as shown by the arrow a, the first small diameter The first brazing material B1 is poured into the gap between the outer peripheral surface of the portion 21a1 and the inner peripheral surface of the connecting pipe 21b.

By sandwiching the ring brazing Ba between the connecting pipe 21b and the first step portion 21a3 in this way, brazing is performed in a state where the connecting pipe 21b, the pipe main body 21a, and the ring brazing Ba are relatively positioned. Can be done. Further, if the first pipe 21 is formed long as in the first embodiment, the first pipe 21 can be inserted into the furnace only in a sideways posture, but the first pipe 21 is miniaturized as in the present embodiment. If this is done, brazing can be performed with the axis of the first pipe 21 (pipe body 21a and connection pipe 21b) oriented in the vertical direction as described above, so that the outer peripheral surface of the first small diameter portion 21a1 can be brazed. The first brazing material B1 can be uniformly poured into the gap between the pipe and the inner peripheral surface of the connecting pipe 21b.

(Modification example of piping body 21a)
FIG. 6 is a cross-sectional view showing a modified example of the piping body.
In the modified example shown in FIG. 6, the end portion 23a of the third pipe 23 is inserted inside the first large diameter portion 21a2 formed in the pipe body 21a of the first pipe 21, and the first large diameter portions 21a2 and the third The pipe 23 is connected by welding.

In the example shown in FIG. 6A, the pipe main body 21a of the first pipe 21 and the third pipe 23 are welded all around at one location in the pipe axial direction indicated by Y1. The welded portion Y1 is located at the tip of the first large diameter portion 21a2. By performing welding from the outer peripheral side of the first large diameter portion 21a2 at the welding portion Y1, the first large diameter portion 21a2 and the third pipe 23 are melted and both are connected.

The welded portion Y1 is located at the end opposite to the second pipe 22 in the range where the pipe main body 21a of the first pipe 21 and the third pipe 23 overlap in the pipe radial direction. In other words, the welded portion Y1 is located on the side closer to the atmosphere (outer side of the refrigerant pipe 10A) in the range where the pipe main body 21a of the first pipe 21 and the third pipe 23 overlap in the pipe radial direction. .. Therefore, the welding work can be easily performed while checking the connection state between the pipe main body 21a of the first pipe 21 and the third pipe 23. Further, as compared with the case where the butt portion between the pipe body 21a and the third pipe 23 is welded as in the embodiment shown in FIG. 4, in this modified example, the welding area can be widened and the pipe body 21a can be widened. The strength of the connecting portion between the pipe and the third pipe 23 can be increased, and the structure can withstand a large stress.

In the example shown in FIG. 6B, the pipe main body 21a and the third pipe 23 of the first pipe 21 are welded all around at two locations in the pipe axial direction indicated by Y1 and Y2. These welded portions Y1 and Y2 are located at both ends of the first large diameter portion 21a2 in the pipe axial direction.

As shown in FIG. 6A, when the first large diameter portion 21a2 and the third pipe 23 are connected only at the welded portion Y1, the end portion 23a of the third pipe 23 due to the flow of the refrigerant in the refrigerant pipe 10A or the like. If a minute movement occurs in the surface, stress may be concentrated near the boundary between the first large diameter portion 21a2 and the first stepped portion 21a3. Therefore, in the example shown in FIG. 6B, the movement of the third pipe 23 is restricted by connecting the first large diameter portion 21a2 and the third pipe 23 even at the welded portion Y2, and the first pipe 21 The stress concentration generated in the piping body 21a can be suppressed.

In the example shown in FIG. 6 (c), the end portion of the third pipe 23 is inside the first large diameter portion 21a2 formed in the pipe body 21a of the first pipe 21 as in the example shown in FIG. 6 (a). 23a is inserted, and the first large diameter portion 21a2 and the third pipe 23 are connected by welding. The first large-diameter portion 21a2 of this modification is formed shorter in the pipe axis direction than the first large-diameter portion 21a2 shown in FIG. 6A, and the pipe main body 21a and the third pipe 23 of the first pipe 21 are formed. Is welded all around at one location Y3 in the pipe axis direction. In this modification, since the first large diameter portion 21a2 is formed short, the entire range of the first large diameter portion 21a2 in the pipe axial direction is connected to the third pipe 23 even when welding is performed at one location Y3. Can be done.

In each of the examples shown in FIGS. 6A to 6C, the first small diameter portion 21a1 of the pipe body 21a is formed short in the pipe axis direction, or the connecting pipe 21b is formed long in the pipe axis direction. , The end of the connecting pipe 21b may be applied to the first stepped portion 21a3 to position the connecting pipe 21b in the pipe axial direction with respect to the pipe main body 21a.

7 to 9 are cross-sectional views showing a further modified example of the piping main body.
In the example shown in FIG. 7A, the pipe main body 21a of the first pipe 21 is composed of a straight pipe having a constant outer diameter. On the other hand, the third pipe 23 has a third small diameter portion 23a1, a third large diameter portion 23a2, and a third step portion 23a3. The third small diameter portion 23a1 is arranged at the end of the third pipe 23 and is inserted inside the pipe main body 21a. The pipe main body 21a and the third pipe 23 are welded all around at one location Y4 in the pipe axial direction. This welding is performed over the entire range of the third small diameter portion 23a1 in the pipe axial direction.

In the example shown in FIG. 7B, the pipe main body 21a of the first pipe 21 is composed of a straight pipe having a constant outer diameter. The third pipe 23 is also composed of a straight pipe having at least an end having the same outer diameter as the pipe main body 21a. The pipe main body 21a and the third pipe 23 are welded on the abutted surface Y5.

In the modified example shown in FIG. 8, the pipe body 21a of the first pipe 21 has a fourth large diameter portion 21a4 having a larger diameter than the first large diameter portion 21a2, a first large diameter portion 21a2, and a fourth large diameter portion 21a2. A fourth step portion 21a5 arranged between the diameter portion 21a4 and the diameter portion 21a4 is formed. The end of the third pipe 23 is inserted into the fourth large diameter portion 21a4, and the fourth large diameter portion 21a4 and the third pipe 23 are connected by welding.

In the example shown in FIG. 8A, the fourth large-diameter portion 21a4 and the third pipe 23 of the first pipe 21 are welded all around at one location in the pipe axial direction indicated by Y1. The welded portion Y1 is located at the tip of the fourth large diameter portion 21a4. By welding from the outer peripheral side of the fourth large diameter portion 21a4 at the welded portion Y1, the fourth large diameter portion 21a4 and the third pipe 23 are melted and both are connected.

The welded portion Y1 is located at the end opposite to the second pipe 22 in the range where the pipe main body 21a of the first pipe 21 and the third pipe 23 overlap in the pipe radial direction. In other words, the welded portion Y1 is located on the side closer to the atmosphere (outer side of the refrigerant pipe 10A) in the range where the pipe main body 21a of the first pipe 21 and the third pipe 23 overlap in the pipe radial direction. .. Therefore, the welding work can be easily performed while checking the connection state between the pipe main body 21a of the first pipe 21 and the third pipe 23. Further, as compared with the case where the butt portion between the pipe body 21a and the third pipe is welded as in the embodiment shown in FIG. 4, in this modified example, the welding area can be widened, and the pipe body 21a and the pipe body 21a The strength of the connection portion with the third pipe can be increased, and the structure can withstand a large stress.

In the example shown in FIG. 8B, the pipe main body 21a and the third pipe 23 of the first pipe 21 are welded all around at two locations in the pipe axial direction indicated by Y1 and Y2. These welded portions Y1 and Y2 are located at both ends of the fourth large diameter portion 21a4 in the pipe axial direction.

As shown in FIG. 8A, when the fourth large diameter portion 21a4 and the third pipe 23 are connected only at the welded portion Y1, the end portion 23a of the third pipe 23 due to the flow of the refrigerant in the refrigerant pipe 10A or the like. If a minute movement occurs in the pipe, stress may be concentrated near the boundary between the fourth large diameter portion 21a4 and the fourth step portion 21a5. Therefore, in the example shown in FIG. 8B, the movement of the third pipe 23 is restricted by connecting the fourth large diameter portion 21a4 and the third pipe 23 even at the welded portion Y2, and the first pipe 21 is used. The resulting stress concentration can be suppressed.

In the example shown in FIG. 9, the fourth large diameter portion 21a4 and the fourth stepped portion 21a5 are formed on the pipe main body 21a of the first pipe 21 as in the example shown in FIG. A third pipe 23 is inserted into the fourth large diameter portion 21a4, and the fourth large diameter portion 21a4 and the third pipe 23 are connected by welding. The fourth large-diameter portion 21a4 of this modification is formed shorter in the pipe axis direction than the fourth large-diameter portion 21a4 shown in FIG. 8, and the first pipe 21 and the third pipe 23 are formed in the pipe axis direction. It is welded all around at one location Y3. In this modification, since the 4th large diameter portion 21a4 is formed short, the entire range of the 4th large diameter portion 21a4 in the pipe axial direction is connected to the 3rd pipe 23 even if welding is performed at one location Y3. Can be done.

[Third Embodiment]
FIG. 10 is a cross-sectional view showing a connecting portion between the first pipe and the second pipe of the refrigerant pipe according to the third embodiment.
The structure of the first pipe 21 of the refrigerant pipe 10A of the present embodiment is different from that of the first embodiment. The pipe body 21a of the first pipe 21 has a constant inner diameter and outer diameter D, and does not have the first large diameter portion, the first small diameter portion, and the first step portion as in the first embodiment.

Also in this embodiment, substantially the same effect as that of the first embodiment is obtained. Since the first pipe 21 does not require the first small diameter portion 21a1, it has an advantage that it can be easily processed. However, in the present embodiment, it is necessary to greatly enlarge the outer diameter of the second large diameter portion 22a of the second pipe 22 as compared with the first embodiment, which makes it difficult to process the second pipe 22. In this respect, the first embodiment is more advantageous.

[Fourth Embodiment]
FIG. 11 is a cross-sectional view showing a connecting portion between the first pipe and the second pipe of the refrigerant pipe according to the fourth embodiment.
The structure of the first pipe 21 of the refrigerant pipe 10A of the present embodiment is different from that of the first embodiment. The connecting pipe 21b of the first pipe 21 has a larger protrusion amount T1 in the pipe axis direction of the protruding portion 21b1 protruding from the pipe main body 21a than the overlapping amount R1 with the pipe main body 21a. The protrusion amount T1 of the protrusion 21b1 is larger than the overlap amount R2 of the connecting pipe 21b and the second pipe 22 in the pipe axis direction. Therefore, the refrigerant pipe 10A of the present embodiment has a region R4 in which the connecting pipe 21b is independently present in the middle of the pipe axial direction.

Also in this embodiment, substantially the same effect as that of the first embodiment is obtained. However, the refrigerant pipe 10A of the present embodiment has a region R4 in which the connecting pipe 21b, which may have a decrease in strength due to brazing in the furnace, exists independently, and therefore, in terms of strength, the strength of the first embodiment Is more advantageous.

[Other Embodiments]
In each of the embodiments described above, the connecting pipe 21b and the second pipe 22 of the first pipe 21 are made of copper. However, these are not limited to copper and can be changed as appropriate. For example, the connecting pipe 21b of the first pipe 21 and the second pipe 22 can be made of a copper alloy. A copper alloy is an alloy in which the properties of copper are improved by adding another metal or non-metal to copper as a main component. Copper alloy, like copper, is a member that does not require flux treatment and is easy to braze. As the copper alloy, for example, one containing 98% by weight or more of copper is adopted. More preferably, a copper alloy containing 99% by weight or more of copper is adopted.

The connecting pipe 21b of the first pipe 21 and the second pipe 22 may be made of the same material as the main components. Therefore, the connecting pipe 21b and the second pipe 22 of the first pipe 21 are made of copper, or both are made of copper alloy, and one is made of copper and the other is made of copper alloy. May be good. When both the connecting pipe 21b of the first pipe 21 and the second pipe 22 are copper alloys, the components other than the main component may be different from each other. That is, the connecting pipe 21b and the second pipe 22 may be made of materials having the same main component but different from each other. In this case as well, both can be brazed without using flux.

The connecting pipe 21b of the first pipe 21 and the second pipe 22 may be made of aluminum or an aluminum alloy. As used herein, the term "aluminum" is "pure aluminum" containing 99.9% by weight or more of aluminum as a main component. An aluminum alloy is an alloy in which the properties of aluminum are improved by adding another metal or non-metal to aluminum as a main component. As the aluminum alloy, for example, an alloy containing 95% by weight or more of aluminum is adopted. The connecting pipe 21b and the second pipe 22 of the first pipe 21 are either made of aluminum, both are made of aluminum alloy, or one is made of aluminum and the other is made of aluminum alloy. It may be. When both the connecting pipe 21b of the first pipe 21 and the second pipe 22 are aluminum alloys, components other than the main component may be different.

Since copper, copper alloy, aluminum, and aluminum alloy are often applied as the second pipe 22 that constitutes a part of the element component X, the connecting pipe 21b of the first pipe 21 is formed of these materials. Therefore, a highly versatile refrigerant pipe 10A can be manufactured from the viewpoint of connection with the second pipe 22.

The second pipe 22 of each of the above embodiments is provided in the element component X and constitutes a part of the element component X, but may simply form only the refrigerant pipe 10A. The first pipe 21 may form a part of the element component X.

[Action and effect of the embodiment]
(1) The refrigerant pipe 10A of each of the above embodiments includes a first pipe 21 and a second pipe 22. The first pipe 21 has a pipe main body 21a made of stainless steel and a connecting pipe 21b provided at the end of the pipe main body 21a in the pipe axial direction and made of a material different from stainless steel. The connecting pipe 21b has a protruding portion 21b1 protruding from the end of the pipe main body 21a in the pipe axial direction. The second pipe 22 is made of the same material as the connecting pipe 21b. The second pipe 22 has a second large diameter portion 22a arranged at the end in the pipe axis direction, a second small diameter portion 22b having a diameter smaller than that of the second large diameter portion 22a, and a second large diameter portion 22a and a second pipe 22. It is provided with a second step portion 22c arranged between the two small diameter portions 22b. The connecting pipe 21b is inserted into the second large diameter portion 22a. The protruding portion 21b1 is in contact with the second stepped portion 22c. The outer peripheral surface of the connecting pipe 21b is connected to the inner peripheral surface of the second large diameter portion 22a.

In the refrigerant pipe 10A having the above configuration, brazing of stainless steel is not required for the connection between the first pipe 21 and the second pipe 22, and the first pipe 21 and the second pipe 22 can be easily connected. Can be done. Stainless steel, which is the material of the pipe body 21a of the first pipe 21, is cheaper than copper or the like, which is the material of the second pipe 22. Therefore, the refrigerant pipe 10A of the above embodiment can be manufactured at a lower cost than the refrigerant pipe made entirely of copper.

(2) The refrigerant pipe 10A of the other embodiment includes a first pipe 21 and a second pipe 22, and the first pipe 21 is made of stainless steel and is in the pipe axis direction of the pipe body 21a and the pipe body 21a. It has a connecting pipe 21b provided at the end and made of a material different from stainless steel. The connecting pipe 21b has a protruding portion 21b1 protruding from the end of the pipe main body 21a in the pipe axial direction. The second pipe 22 is made of the same material as the connecting pipe 21b and has a second large diameter portion 22a arranged at the end in the pipe axial direction and a second diameter smaller than that of the second large diameter portion 22a. It includes a small diameter portion 22b and a second step portion 22c arranged between the second large diameter portion 22a and the second small diameter portion 22b. The connecting pipe 21b is inserted into the second large diameter portion 22a. The protruding portion 21b1 is in contact with the second stepped portion 22c. The outer peripheral surface of the connecting pipe 21b is connected to the inner peripheral surface of the second large diameter portion 22a.

In the refrigerant pipe 10A having the above configuration, brazing of stainless steel is not required for the connection between the first pipe 21 and the second pipe 22, and the first pipe 21 and the second pipe 22 can be easily connected. Can be done. Stainless steel, which is the material of the pipe body 21a of the first pipe 21, is cheaper than copper or the like, which is the material of the second pipe 22. Therefore, the refrigerant pipe 10A of the above embodiment can be manufactured at a lower cost than the refrigerant pipe made entirely of copper.

(3) In the refrigerant pipe 10A of the other embodiment, the connection pipe 21b and the second pipe 22 are made of different materials having the same main component.
Even in such a case, the first pipe and the second pipe can be easily connected.

(4) In each of the above embodiments, each of the connecting pipe 21b and the second pipe 22 is made of copper, a copper alloy, aluminum, or an aluminum alloy. Therefore, the first pipe 21 and the second pipe 22 can be easily connected by brazing using an inexpensive brazing material.

(5) In the first and second embodiments, the end portion of the pipe main body 21a and the second large diameter portion 22a are arranged so as to overlap in the pipe radial direction. Therefore, in the refrigerant pipe 10A, the connecting pipe 21b, which may be weakened by brazing in the furnace, does not exist independently, and the strength reduction of the connecting pipe 21b is compensated by the pipe main body 21a and the second pipe 22. Can be done.

(6) In the first and third embodiments, the pipe body 21a of the first pipe 21 has a first small diameter portion 21a1 and a first large diameter portion 21a2 having a diameter larger than that of the first small diameter portion 21a1. A connecting pipe 21b is provided on the outer peripheral surface of the first small diameter portion 21a1. Therefore, the diameter of the second large diameter portion 22a of the second pipe 22 is compared with the case where the pipe body 21a of the first pipe 21 is a straight pipe having a constant inner diameter and outer diameter (in the case of the second embodiment). It is not necessary to form a large pipe in the radial direction, and the processing of the second pipe 22 can be facilitated.

(7) In each of the above embodiments, the second small diameter portion 22b of the second pipe 22 and the first large diameter portion 21a2 of the pipe main body 21a have the same outer diameter D. Therefore, in the manufacturing process of the refrigerating apparatus 1, when the first pipe 21 and the second pipe 22 are connected or bent by brazing or the like, jigs for fixing, holding, handling, etc. of each pipe are standardized. can do.

(8) In each of the above embodiments, the second small diameter portion 22b of the second pipe 22 and the first large diameter portion 21a2 of the pipe main body 21a have the same inner diameter. Therefore, the pressure fluctuation of the refrigerant flowing through the refrigerant pipe 10A can be reduced.

(9) In each of the above embodiments, the opening of the second large diameter portion 22a of the second pipe 22 is arranged upward. Therefore, the second brazing material B2 can be easily poured between the inner peripheral surface of the second large diameter portion 22a of the second pipe 22 and the outer peripheral surface of the connecting pipe 21b of the first pipe 21, and the first pipe 21 can be easily poured. And the second pipe 22 can be easily connected.

(10) In the second embodiment, the first pipe 21 constitutes a joint that connects the second pipe 22 and another stainless steel pipe 23. Therefore, the first pipe 21 can be miniaturized, and the work of providing the connecting pipe 21b on the pipe main body 21a can be easily performed.

It should be noted that the present disclosure is not limited to the above 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.

1: Refrigerant device 4: Refrigerant circuit 10: Refrigerant pipe 10A: Refrigerant pipe 12: Compressor 21: First pipe 21a: Piping body 21a1: First small diameter portion 21a2: First large diameter portion 21a3: First step portion 21b: Connection pipe 21b1: Protruding part 22: Second pipe 22a: Second large diameter part 22b: Second small diameter part 23: Third pipe D: Outer diameter X: Element parts

Claims (13)

A refrigerant pipe that constitutes the refrigerant circuit (4) of the refrigerating device (1).
A first pipe (21) and a second pipe (22) are provided.
The first pipe (21) is provided with a pipe body (21a) made of stainless steel and a connecting pipe (21b) provided at the end of the pipe body (21a) in the pipe axial direction and made of a material different from stainless steel. Have and
The connecting pipe (21b) has a protruding portion (21b1) protruding in the pipe axis direction from the end portion of the piping main body (21a).
The second large-diameter portion (22a) made of the same material as the connecting pipe (21b) and arranged at the end in the pipe axial direction, and the second large-diameter portion (22a). It is provided with a second small diameter portion (22b) having a smaller diameter than the second small diameter portion (22b) and a step portion (22c) arranged between the second large diameter portion (22a) and the second small diameter portion (22b). ,
The connecting pipe (21b) is inserted into the second large diameter portion (22a), and the connecting pipe (21b) is inserted into the second large diameter portion (22a).
The protruding portion (21b1) comes into contact with the stepped portion (22c).
The outer peripheral surface of the connecting pipe (21b) is connected to the inner peripheral surface of the second large diameter portion (22a) .
A refrigerant pipe in which the end portion of the pipe body (21a) and the second large diameter portion (22a) are arranged so as to overlap in the pipe radial direction. A refrigerant pipe that constitutes the refrigerant circuit (4) of the refrigerating device (1).
A first pipe (21) and a second pipe (22) are provided.
The first pipe (21) is provided with a pipe body (21a) made of stainless steel and a connecting pipe (21b) provided at the end of the pipe body (21a) in the pipe axial direction and made of a material different from stainless steel. Have and
The connecting pipe (21b) has a protruding portion (21b1) protruding in the pipe axis direction from the end portion of the piping main body (21a).
The second large diameter portion (22a) is made of the same material as the connecting pipe (21b) and is arranged at the end in the pipe axis direction, and the second large diameter portion (22a) and the second large diameter portion. A second small diameter portion (22b) having a diameter smaller than that of the portion (22a), a step portion (22c) arranged between the second large diameter portion (22a) and the second small diameter portion (22b), and a step portion (22c). Is equipped with
The connecting pipe (21b) is inserted into the second large diameter portion (22a), and the connecting pipe (21b) is inserted into the second large diameter portion (22a).
The protruding portion (21b1) comes into contact with the stepped portion (22c).
The outer peripheral surface of the connecting pipe (21b) is connected to the inner peripheral surface of the second large diameter portion (22a) .
A refrigerant pipe in which the end portion of the pipe body (21a) and the second large diameter portion (22a) are arranged so as to overlap in the pipe radial direction. A refrigerant pipe that constitutes the refrigerant circuit (4) of the refrigerating device (1).
A first pipe (21) and a second pipe (22) are provided.
The first pipe (21) is provided with a pipe body (21a) made of stainless steel and a connecting pipe (21b) provided at the end of the pipe body (21a) in the pipe axial direction and made of a material different from stainless steel. Have and
The connecting pipe (21b) has a protruding portion (21b1) protruding in the pipe axis direction from the end portion of the piping main body (21a).
The second large-diameter portion (22a) made of the same material as the connecting pipe (21b) and arranged at the end in the pipe axial direction, and the second large-diameter portion (22a). It is provided with a second small diameter portion (22b) having a smaller diameter than the second small diameter portion (22b) and a step portion (22c) arranged between the second large diameter portion (22a) and the second small diameter portion (22b). ,
The connecting pipe (21b) is inserted into the second large diameter portion (22a), and the connecting pipe (21b) is inserted into the second large diameter portion (22a).
The protruding portion (21b1) comes into contact with the stepped portion (22c).
The outer peripheral surface of the connecting pipe (21b) is connected to the inner peripheral surface of the second large diameter portion (22a) .
The second pipe (22) is provided in the element component (X) constituting the refrigerant circuit (4).
It said component parts (X) is Ru compressor der, refrigerant pipe. A refrigerant pipe that constitutes the refrigerant circuit (4) of the refrigerating device (1).
A first pipe (21) and a second pipe (22) are provided.
The first pipe (21) is provided with a pipe body (21a) made of stainless steel and a connecting pipe (21b) provided at the end of the pipe body (21a) in the pipe axial direction and made of a material different from stainless steel. Have and
The connecting pipe (21b) has a protruding portion (21b1) protruding in the pipe axis direction from the end portion of the piping main body (21a).
The second large diameter portion (22a) is made of the same material as the connecting pipe (21b) and is arranged at the end in the pipe axis direction, and the second large diameter portion (22a) and the second large diameter portion. A second small diameter portion (22b) having a diameter smaller than that of the portion (22a), a step portion (22c) arranged between the second large diameter portion (22a) and the second small diameter portion (22b), and a step portion (22c). Is equipped with
The connecting pipe (21b) is inserted into the second large diameter portion (22a), and the connecting pipe (21b) is inserted into the second large diameter portion (22a).
The protruding portion (21b1) comes into contact with the stepped portion (22c).
The outer peripheral surface of the connecting pipe (21b) is connected to the inner peripheral surface of the second large diameter portion (22a) .
The second pipe (22) is provided in the element component (X) constituting the refrigerant circuit (4).
It said component parts (X) is Ru compressor der, refrigerant pipe. The refrigerant pipe according to claim 2 or 4 , wherein the connecting pipe (21b) and the second pipe (22) are made of different materials having the same main component. The refrigerant pipe according to any one of claims 1 to 5 , wherein each of the connecting pipe (21b) and the second pipe (22) is made of copper, a copper alloy, aluminum, or an aluminum alloy. The refrigerant pipe according to claim 3 or 4 , wherein the end portion of the pipe main body (21a) and the second large diameter portion (22a) are arranged so as to overlap in the pipe radial direction. The piping main body (21a) includes a first small diameter portion (21a1) and a first large diameter portion (21a2) having a diameter larger than that of the first small diameter portion (21a1), and the connecting pipe (21b) The refrigerant pipe according to any one of claims 1 to 7 , which is provided on the outer peripheral surface of the first small diameter portion (21a1). 8. The second small diameter portion (22b) of the second pipe (22) and the first large diameter portion (21a2) of the pipe body (21a) have the same outer diameter (D), claim 8. Refrigerant piping described in. The refrigerant according to claim 8 , wherein the second small diameter portion (22b) of the second pipe (22) and the first large diameter portion (21a2) of the pipe body (21a) have the same inner diameter. Piping. The refrigerant pipe according to any one of claims 1 to 10 , wherein the opening of the second large diameter portion (22a) of the second pipe (22) is arranged upward. The invention according to any one of claims 1 to 11, wherein the first pipe (21) constitutes a joint connecting the second pipe (22) and another stainless steel pipe (23). Refrigerant piping. The refrigerant pipe (10A) according to any one of claims 1 to 12 and
A refrigerating apparatus comprising a refrigerant circuit (4) and an element component (X) to which the refrigerant pipe (10A) is connected.

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