JP5162437B2 - Accumulator for refrigeration cycle - Google Patents

Description

The present invention relates to an accumulator used in, for example, a supercritical refrigeration cycle using carbon dioxide (CO ₂ ) as a refrigerant.

Traditionally, chlorofluorocarbons (CFC, chlorofluorocarbon) or its substitute chlorofluorocarbon (HFC, hydrofluorocarbon) for applying load to the refrigerating cycle environment using the refrigerant, CO ₂ using CO ₂ not to apply too much load on the environment in a refrigerant Development of a cooling system using a refrigeration cycle is underway.

Carbon dioxide CO ₂ has a low critical temperature (boundary temperature that cannot be converted to a liquid unless compressed to a temperature below it) as low as 31.1 ° C., and in the CO ₂ refrigeration cycle using this CO ₂ as a refrigerant, it is a refrigerant on the high pressure side. By setting the pressure to exceed the critical pressure of CO ₂ (7.4 MPa), the refrigerant is placed in a supercritical state of high temperature and high pressure, and a high pressure side that is high in the supercritical refrigeration cycle is provided. It is used for heat exchange with the low-pressure side that is the temperature. Since the refrigerant pressure is set to exceed the CO ₂ critical pressure in this way, the CO ₂ refrigeration cycle is called a supercritical refrigeration cycle.

  By using supercritical operation on the high-pressure side, high temperature (80 ° C or higher) can be taken out relatively easily, so the total efficiency (cooling, heating, energy efficiency on both sides) as a cold and hot simultaneous take-out device (so-called heat recovery machine) Sum) is high.

  Since this supercritical refrigeration cycle operates under a high pressure condition several times that of a conventional refrigeration cycle using a refrigerant such as chlorofluorocarbon, an accumulator that can withstand this high pressure condition is used for the supercritical refrigeration cycle ( For example, see Patent Document 1).

The accumulator 1 of this patent document 1 is for a supercritical refrigeration cycle. As shown in FIG. 9, the accumulator 1 is disposed in a cylindrical body (container body) 2 having one end opened, and in the body (container body) 2. The U-shaped suction pipe 3 for passing the gas refrigerant and the closing member (head portion) 4 which is fixed to the upper end portion of the barrel (container body) 2 by welding or the like and closes the opening of the barrel (container body). In the supercritical refrigeration cycle, the mixed refrigerant in which the gas refrigerant and the liquid refrigerant are mixed is gas-liquid separated to store the liquid refrigerant.
JP 2007-212007 A

However, in the accumulator 1 of Patent Document 1, the body (container body) 2 and the closing member (head portion) 4 are connected only by welding S, and the thickness of the copper 2 is increased in order to increase the pressure resistance. There is a problem that the weight of the accumulator 1 increases.
Also, changing the thickness of the accumulator changes various conditions such as the accumulator weight, required welding temperature, and required welding depth, making it difficult to manage conditions such as setting conditions for optimum conditions. It was.

  The present invention has been made by paying attention to the above problems, and an object thereof is to provide an accumulator for a refrigeration cycle which is relatively thin and light, has a higher pressure resistance, and can easily manage a welded portion.

In order to achieve the above object, the present invention comprises a cylindrical container body having one end opened and a cylindrical lid member having the other end opened, and the other end opening of the lid member is provided at one end opening of the container body. In the accumulator for the refrigeration cycle that welds
Forming internal thread portions on the inner peripheral wall in the vicinity of the opening of the container body and the lid member,
Providing a cylindrical connecting member having a first male screw portion screwed into the female screw portion of the container body and a second male screw portion screwed into the female screw portion of the lid member formed on the outer peripheral surface;
The first and second male screw portions of the connecting member are screwed into the female screw portion of the container body and the female screw portion of the lid member,
The container main body and the lid member are welded, and the connecting member is melted and fused to the lid member and the container by heat of fusion at the time of welding.

  According to the accumulator of the present invention, it is possible to provide an accumulator for a refrigeration cycle that is lightweight, has high pressure strength, and can easily manage a welded portion.

  Hereinafter, the best mode for realizing an accumulator for a refrigeration cycle according to the present invention will be described based on an embodiment shown in the drawings.

FIG. 1 is a cycle system diagram showing a CO ₂ refrigeration cycle (for a supercritical refrigeration cycle) of a vehicle air conditioner to which an accumulator of an embodiment is applied.

CO ₂ refrigeration cycle 100 using the CO ₂ refrigerant is a natural refrigerant, as shown in FIG. 1, a compressor 11, a gas cooler 12, an expansion valve 13, a metal and an evaporator 14, an accumulator 15 annularly in this order Connected with a tube. The CO ₂ refrigeration cycle 100 has an internal heat exchanger 16.

  The compressor 11 is driven by an engine, a motor, or the like, and compresses the gas refrigerant from the accumulator 15 to obtain a high-temperature / high-pressure gas refrigerant. The compressor 11 controls the pressure in the crank chamber, changes the piston stroke of the compressor 11 to change the discharge capacity, and performs a differential pressure control ECV (Electric Control Valve) that controls the differential pressure between the high pressure and the low pressure of the compressor. It has an external variable capacity control type.

The high-pressure gas refrigerant saturated with CO ₂ that circulates in the CO ₂ refrigeration cycle has a density about seven times that of conventional refrigerants of chlorofluorocarbons (alternative chlorofluorocarbons). Since it is twice the latent heat of vaporization (per unit mass), the cooling capacity per unit volume (latent heat of vaporization x gas density) is about eight times. For this reason, the discharge capacity of the compressor 11 can exhibit sufficient performance when it is about 15 to 30 cc.

The gas cooler 12 is a heat exchanger that exchanges heat between the high-temperature and high-pressure gas refrigerant from the compressor 11 and the outside air to obtain a medium-temperature and high-pressure gas refrigerant.
The expansion valve 13 is installed in the engine room, and the medium temperature / high pressure gas refrigerant from the gas cooler 12 is decompressed to adiabatically expand to form a low temperature / low pressure liquid / gas mixed refrigerant. The expansion valve 13 controls the opening degree of the valve so as to maintain the maximum cooling performance based on the refrigerant temperature and refrigerant pressure at the outlet of the gas cooler 12.

  The evaporator 14 is a heat exchanger that is disposed together with a blower or the like in the vehicle air conditioning unit 7 that performs air conditioning in the vehicle interior. By passing the low-temperature and low-pressure liquid-gas mixed refrigerant from the expansion valve 13 into the tube of the evaporator 14, heat is taken from the air flowing around the outside of the tube, and the refrigerant temperature is increased to promote gasification of the refrigerant. In addition, the air that has passed through the outer periphery of the tube is dehumidified and dehumidified, and is air-conditioned by a heating heat exchanger (not shown) and blown out into the passenger compartment.

In the CO ₂ refrigeration cycle, the equilibrium pressure of the CO ₂ refrigerant on the high pressure side becomes a high pressure of 7 MPa (about 70 bar) or higher, and therefore it is necessary to ensure the reliability of the evaporator 14 to prevent refrigerant leakage into the vehicle compartment. . For this reason, the evaporator 14 is different in structure from an evaporator using chlorofluorocarbons as a refrigerant, and has a structure in which the core (heat exchange part), piping (refrigerant passage), and flange (heat radiation fin) are integrated. . Thereby, it is not necessary to use an O-ring seal for the evaporator 14, and a slow leak of refrigerant that becomes a problem when the O-ring seal is used does not occur.

The accumulator 15 separates the liquid-gas mixed refrigerant introduced from the evaporator 14 into a liquid refrigerant and a gas refrigerant when the evaporator 14 cannot be completely gasified, returns only the gas refrigerant to the compressor 11, and CO ₂ refrigeration cycle. The excess liquid refrigerant in 100 is stored inside the main body.

In the CO ₂ refrigeration cycle, the pressure of the CO ₂ refrigerant exceeds the critical pressure at the high pressure side, so that the refrigerant does not become a liquid phase, and a liquid tank is provided on the high pressure side as in a general refrigeration cycle using chlorofluorocarbons. However, there is no meaning, and an appropriate amount of refrigerant in the CO ₂ refrigeration cycle is managed by providing an accumulator on the low pressure side where the gas phase and liquid phase can coexist.

The internal heat exchanger 16 exchanges heat between the medium-temperature and high-pressure refrigerant that has exited the gas cooler 12 and the low-temperature and low-pressure refrigerant that has exited the accumulator 15 to form a liquid refrigerant in front of the expansion valve 13.
The internal heat exchanger 16 further lowers the refrigerant temperature at the inlet of the expansion valve 13 to improve the coefficient of performance (COP, Coefficient of Performance) of the CO ₂ refrigeration cycle 100.
FIG. 2 is a vertical longitudinal sectional view showing the internal structure of the accumulator 15 of the embodiment. FIG. 3 is a perspective view of the accumulator 15 of FIG. 4 (a), 4 (b), 7 (a) and 7 (b) are enlarged views of the welded portion of the accumulator of FIG.

  As shown in FIGS. 2 and 3, the accumulator 15 includes a cylindrical container body 17 having one end (upper end in the figure) opened, and a cylindrical head portion having the other end (lower end in the figure) opened. 18, a U-shaped suction pipe 19 disposed in the container main body 17, a cylindrical fastening member 20 having both ends for fastening the head portion 18 and the container main body 17 open, and the like.

  Reference numeral 21 denotes a drying member that is disposed in the container body 17 and removes moisture from the liquid-gas mixed refrigerant introduced from the evaporator 14.

The container body 17 is made of a metal such as an aluminum alloy and has a thickness that can withstand the high pressure of the supercritical refrigeration cycle. On the inner peripheral wall surface in the vicinity of the opening of the container body 17, a female screw 17a is cut along the circumferential direction.
The head portion 18 is made of the same metal as the container body 17 and is made of, for example, an aluminum alloy.

The head portion 18 has a cylindrical portion 18f whose inner diameter is substantially the same as the inner diameter of the container body 17 and the other end is opened, and one end of the cylindrical portion 18f is closed by a top wall portion 18g integrally formed.
The top wall 18g has a refrigerant inlet 18a for introducing the lubricating oil of the compressor 11 circulating in the refrigeration cycle together with the liquid-gas mixed refrigerant and refrigerant from the evaporator 14, and an accumulator next to the refrigerant inlet 18a. A refrigerant outlet 18 c for discharging the gas refrigerant and the lubricating oil from 15 and sending it to the internal heat exchanger 16 is formed. A female screw 18d is cut in the substantially circumferential direction on the inner peripheral wall surface of the opening of the head portion 18.

  A projecting portion 18b that projects downward is integrally formed on the lower surface of the top wall portion 18g of the head portion 18, and the refrigerant inlet port 18a and the refrigerant outlet port 18c are formed from the upper surface of the top wall portion 18g of the head portion 18. It penetrates to the lower surface of the protrusion 18b.

  A support member 18h is detachably attached to the lower part of the refrigerant inlet 18a, and a strainer 18e that removes foreign matters such as dust and the like present in the refrigerant and lubricating oil is supported by the support member 18h. Metal pipes 8 and 9 are connected to the refrigerant inlet 18a and the refrigerant outlet 18c of the head portion 18 (see FIG. 1).

  The suction pipe 19 is integrally formed at the lower ends of the two first straight pipe portions 19a and 19b extending in the vertical direction and the two straight pipe portions 19a and 19b, and communicates the two straight pipe portions 19a and 19b. It has an arcuate tube portion 19c.

  The upper end portion of the first straight pipe portion 19a (left side in FIG. 2) is connected to the refrigerant outlet 18c. With this connection, the suction pipe 19 is supported by the head portion 18. The upper open end of the second straight pipe portion 19b (right side in FIG. 2) is located above the head portion 18, and the gas refrigerant introduced from the refrigerant inlet 18a is directly introduced into the suction pipe 19. It has become so.

A lubricating oil return hole 19 f is formed at the bottom of the arcuate tube portion 19 c of the suction pipe 19. The lubricating oil return hole 19f is positioned below the oil level of the lubricating oil (not shown) accumulated in the bottom of the container body 17, and the lubricating oil is sucked into the gas refrigerant flowing in the suction pipe 19. It has become so.
The drying member 21 is manufactured by forming a breathable material such as felt in a bag shape and filling the inside with a desiccant. The drying member 21 is sandwiched between the first straight pipe portion 19a and the second straight pipe portion 19b to remove moisture in the refrigerant.

The fastening member (connecting member) 20 is made of the same metal as the container body 17 and is made of, for example, an aluminum alloy.
The outer diameter of the fastening member 20 is set to be the same as the inner diameters of the head portion 18 and the container body 17. A male screw (first screw portion) 20a is cut along the circumferential direction at one end (lower side in FIG. 2) of the outer peripheral surface of the fastening member 20.

  Further, a male screw (second screw portion) 20b is cut along the circumferential direction at the other end (upper side in FIG. 2) of the outer peripheral surface of the fastening member 20. The two male screws 20a and 20b are separated from each other, and the directions of the screws are opposite to each other.

Since the male screws 20a and 20b are separated from each other, the screwing depth can be easily managed, and the directions of the screws are reversed. When the screws are screwed and tightened, the tightening of one of the screws does not loosen, so that the screws can be securely tightened.
Both male screws 20a and 20b do not necessarily need to be separated from each other, and may be continuously reverse screws. In this case, the fastening member 20 can be easily manufactured.

  With respect to the two male screws 20a and 20b, the number of ridges and valleys and the angle thereof are set so as to satisfy the pressure resistance requirement required for the accumulator 15.

The male screw 20a of the fastening member 20 is screwed with the female screw 17a of the container body, and the male screw 20b of the fastening member 20 is screwed with the female screw 18d of the head portion 18.
By this screwing, the head portion 18 and the container body 17 are fastened, and the opening end of the container body 17 and the opening end of the head portion 18 are brought into contact with each other. Only the fastening of the head portion 18 and the container body 17 by this screwing can withstand the pressure when the refrigeration cycle pressure when the CO ₂ refrigeration cycle is stopped is balanced. Further, this contact portion, that is, the opening end of the container body 17 and the opening end of the head portion 18 are joined by welding (see FIG. 7A).

  By this welding, the opening end of the container main body 17 and the opening end of the head portion 18 are melted and fused to each other, but part of the peripheral wall between the male screw 20a and the male screw 20b of the fastening member 20 is also melted by this melting heat. The three members are melted together and fused together with the head portion 18 and the container body 17.

FIG. 4 is a stress distribution diagram showing the thickness T of the peripheral wall of the fastening member 20 when the pressure (26 MPa) is applied to the accumulator 15 and the distribution of stress applied around the welded portion. 6A is a graph showing the relationship between the stress in the portion A of the fastening member 20 shown in FIG. 4, the contact portion B of the container body 17 and the head portion 18, and the thickness T of the peripheral wall of the fastening member 20. is there.
<Thickness of the peripheral wall of the fastening member 20>

When the thickness T (see FIG. 4) of the peripheral wall of the fastening member 20 is set to 3 mm, as shown in FIG. 4A, stress concentrates on the portion A of the peripheral wall of the fastening member 20, and the stress is As shown in the graph of FIG. 6A, it is 180 N / mm ² .
Further, as can be seen from the graph in FIG. 6A, as the thickness T of the peripheral wall increases, the stress applied to the portion A of the fastening member 20 is dispersed and reduced as shown in FIG. 4B. . FIG. 4B shows the case where the thickness of the fastening member is 5 mm.

However, the stress applied to the contact portion B between the container body 17 and the head portion 18 is minimum when the thickness T of the peripheral wall is 4 mm, and the stress increases when the thickness exceeds 4 mm.
From the graph of FIG. 6A, the range of the thickness T in which no great stress is applied to either the portion A or the contact portion B of the fastening member 20 is 4 to 5.5 mm, and this range (Trg in FIG. 6). If the thickness T of the fastening member 20 is set in (see), it is preferable because a large stress is not applied.

Further, when the thickness T is 5 mm, both the stress applied to the portion A of the fastening member 20 and the contact portion B can be suppressed to 155 N / mm ^2, which is more preferable. In addition, the welding width D of the fastening member 20 mentioned later is constant.
<Welding width D of the fastening member 20>

FIGS. 5A and 5B are stress distribution diagrams showing the distribution of the stress applied to the weld width D of the fastening member 20 and the periphery of the welded portion. FIG. 6B is a graph showing the relationship between the stress at the contact portion B of the fastening member 20 and the welding width D of the fastening member 20 shown in FIG.
When the welding width D of the fastening member 20 is set to 6 mm, as can be seen from the graph of FIG. 6B, a stress of 190 N / mm ² is applied to the contact portion B of the accumulator 15, but the welding width D is set to 2 mm. Is set, a smaller stress of about 168 N / mm ² is applied.

5A shows a case where the welding width D is set to 6 mm, and FIG. 5B shows a case where the welding width D is set to 2 mm.
Further, when the welding width D is made shorter than 2 mm, the stress applied to the contact portion B of the fastening member 20 becomes smaller (not shown).

  However, if the welding width D is too short, the width necessary for welding cannot be secured, so 2 to 6 mm is preferable, and the width necessary for welding can be secured and no large stress is applied, and more preferably 2 mm. . Note that the thickness T of the peripheral wall of the fastening member is constant.

The container body 17, the head portion 18, and the fastening member 20 described above are made of an aluminum alloy. However, the container body 17, the head portion 18, and the fastening member 20 can satisfy arc pressure, electron beam welding, and friction stir welding without being limited thereto. Anything is acceptable.
<About welding>
Arc welding, electron beam welding, friction stir welding, or the like can be applied to the above-described welding.

In the case of friction stir welding, usually two metal plates such as aluminum alloy are abutted, and a contact plate is provided on the side opposite to the side where the probe is arranged when viewed from the metal plate. However, the head portion 18 of the accumulator 15 and the container body In the case of welding 17, the inner ends of the two are closed by abutting the opening ends of the two, so that a backing plate cannot be provided in the accumulator 15.
However, since the peripheral wall of the fastening member 20 functions as the contact plate, friction stir welding is possible. Further, the peripheral wall of the fastening member 20 is welded to the head portion 18 and the container body 17 by this friction stir welding.

  Furthermore, by fastening the head part 18 and the container main body 17 using the fastening member 20, the both ends of the head part 18 and the container main body 17 come into contact with each other reliably, so that friction stir welding is reliably performed.

Next, the operation and effect of the accumulator of this embodiment will be described.
According to the accumulator 15 of the present embodiment, the container main body 17 is formed by screwing the female screw 17a of the container main body 17 and the female screw 18d of the head portion 18 with the two male screws 20a and 20b of the peripheral wall of the fastening means 20, respectively. And the head portion 18 are fastened, so that a cylindrical portion having a smaller or larger diameter than the container main body 17 and the head portion 18 as in the case of directly fastening the male and female screws 17 to the container main body 17 and the head portion 18 respectively. Need not be formed (see FIGS. 8A and 8B). For this reason, even when both are screwed and fastened, the head portion 18 and the container body 17 can be set to substantially the same diameter, and the opening ends of each other can be abutted and welded. For this reason, the structure of the opening of the container body 17 and the opening of the head portion 18 is not complicated, and stress concentration due to the complicated structure does not occur.

  The welded portion between the head portion 18 and the container body 17 is located between the female screw 18d of the head portion 18 and the female screw 17a of the container body 17, in other words, between the male screws 20a and 20b of the fastening means 20. Therefore, the force applied to the welded portion is reduced by fastening the head portion 18 and the container main body 17 by the fastening member 20, and the pressure resistance can be increased without increasing the thickness of the container main body 17. Therefore, it is possible to provide an accumulator for a refrigeration cycle that is relatively thin and lightweight, has a higher pressure resistance, and can easily manage a welded portion.

Since the thickness of the fastening member 20 is preferably set to 4 to 5.5 mm, more preferably 5 mm, the stress applied to the peripheral wall of the fastening member 20 near the welded portion can be dispersed.
Moreover, since the welding width D of the fastening member 20 is preferably set to 2 to 6 mm, more preferably 2 mm, the stress can be dispersed and the distance necessary for welding can be secured.
When the head portion 18 and the container body 17 are welded, the fusion heat of the welding is blocked by the fastening member 20, so that the fusion heat is difficult to be transmitted to the desiccant 21 disposed inside the fastening member 20, and this melting heat is prevented. There is no possibility that the desiccant 21 is broken.
Since the head portion 18 and the container main body 17 are integrated by fastening the fastening member 20, handling during welding and transfer is convenient.

Even if the accumulator 15 vibrates for some reason and the liquid refrigerant in the accumulator 15 moves upward through its inner peripheral wall, the liquid refrigerant is blocked by the fastening member 20, so that the liquid refrigerant may enter the suction pipe 19. There is no.
When the friction stir welding is performed, the peripheral wall of the fastening member 20 serves as a backing plate during the friction stir welding, so that the head portion 18 of the accumulator 15 and the container body 17 can be friction stir welded.

When performing electron beam welding, welding is performed by applying an electron beam to the joint portion of each opening end of the head portion 18 and the container body 17. At this time, the welded portion and the welded portion are welded. Since the fastening member 20 is in contact with the portion, the temperature difference between the two portions can be reduced, and the problem that the magnetic field is disturbed by the temperature difference and the electron beam is deflected can be suppressed.
FIG. 7B is another example of the accumulator of the embodiment. As shown in FIG. 7B, the thickness of the peripheral wall of the fastening member (connecting member) 200 is the peripheral wall between the male screw 20a (first male screw portion) and 20b (second male screw portion) of the fastening member 20. It forms so that it may become thin as it goes to a peripheral wall upper end and a peripheral wall lower end from a center part (refer the part C of FIG.9 (b)). The thickness of each peripheral wall of the upper end and the lower end of the fastening member 200 is set to be substantially the same.

  According to this accumulator 150, the same operation and effect as in the previous embodiment can be obtained, and the stress applied to the peripheral wall of the fastening member 200 can be dispersed.

Although CO ₂ was used as a refrigerant for the supercritical refrigeration cycle and the accumulator of this example was applied to the CO ₂ refrigeration cycle, this example was also applied to a refrigeration cycle using ethylene, ethane, nitrogen oxide, etc. in addition to CO _2. The accumulator can be applied.

Is a cycle system diagram showing the accumulator applied CO ₂ refrigeration cycle of the embodiment (for supercritical refrigeration cycle) It is a vertical longitudinal cross-sectional view which shows the internal structure of the accumulator of an Example. FIG. 3 is a perspective view of the accumulator of FIG. 2. (A) It is a stress distribution figure which shows distribution of the stress concerning the thickness T of the surrounding wall of the fastening member 20, and a welding part periphery. (B) It is a stress distribution figure which shows distribution of the stress concerning the thickness T of the surrounding wall of the fastening member 20, and a welding part periphery. (A) It is a stress distribution figure which shows distribution of the stress concerning the welding width D of the fastening member 20, and a welding part periphery. (B) It is a stress distribution figure which shows distribution of the stress concerning the welding width D of the fastening member 20, and a welding part periphery. (A) It is a graph showing the relationship between the stress in the part A of the fastening member 20 shown in FIG. 4, the contact part B of the container main body 17, and the head part 18, and the thickness T of the surrounding wall of the fastening member 20. FIG. (B) It is a graph showing the relationship between the stress in the contact part B of the fastening member 20 shown in FIG. 5, and the welding width D of the fastening member 20. FIG. (A) It is the figure which expanded the welding part of the accumulator of FIG. (B) It is the figure which expanded the welding part of the accumulator of the other example of an Example. It is a figure which shows the case where a male screw and a female screw are formed in a head part and a container main body, and are mutually fastened. It is a vertical longitudinal cross-sectional view of a conventional accumulator.

Explanation of symbols

17 Container body 18 Head (lid member)
17a, 18d Female thread (Female thread part)
20b Male thread (first male thread part)
20a Male thread (second male thread part)
20 Fastening member (connection member)

Claims (7)

In an accumulator for a refrigeration cycle comprising a cylindrical container body having one end opened and a cylindrical lid member having the other end opened, and welding the other end opening of the lid member to one end opening of the container body,
Forming internal thread portions on the inner peripheral wall in the vicinity of the opening of the container body and the lid member,
Providing a cylindrical connecting member having a first male screw portion screwed into the female screw portion of the container body and a second male screw portion screwed into the female screw portion of the lid member formed on the outer peripheral surface;
The first and second male screw portions of the connecting member are screwed into the female screw portion of the container body and the female screw portion of the lid member,
An accumulator for a refrigeration cycle, wherein the container body and the lid member are welded, and the connecting member is melted and fused to the lid member and the container by heat of fusion at the time of welding. The first male screw portion and the second male screw portion of the connecting member are separated from each other,
The opening of the container body and the opening of the lid member are approximately the same diameter, and the respective opening ends are substantially joined,
The opening end of the container body and the opening end of the lid member are welded, and the peripheral wall between the first male screw portion and the second male screw portion of the connecting member is melted by the heat of fusion of the welding to connect the connecting body. The accumulator for a refrigeration cycle according to claim 1, wherein a member is fused to the lid member and the container.   3. The refrigeration according to claim 1, wherein a thickness of the peripheral wall of the connecting member decreases from the central portion of the peripheral wall between the first screw portion and the second screw portion toward both ends of the peripheral wall. Cycle accumulator.   The refrigeration cycle accumulator according to any one of claims 1 to 3, wherein the welding is performed using an electron beam.   The accumulator for a refrigeration cycle according to any one of claims 1 to 4, wherein the welding is friction stir welding. The accumulator for a refrigeration cycle according to any one of claims 1 to 4, wherein a thickness of a peripheral wall of the connecting member is in a range of 4 mm to 5.5 mm. The accumulator for a refrigeration cycle according to any one of claims 1 to 6, wherein a distance between the first male screw portion and the second male screw portion of the connecting member is in a range of 2 mm to 6 mm.

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