WO2020202699A1 - Receiver tank for heat exchanger - Google Patents

Abstract

The present invention achieves a reduction in weight and improvement in corrosion resistance, facilitates assembly that ensures airtightness, and facilitates replacement of a desiccant. A receiver tank for a heat exchanger is bonded by brazing to a parallel-flow heat exchanger provided with a pair of header pipes and a plurality of heat exchange tubes, wherein provided are: a cylindrical synthetic resin upper tank 11 that accommodates a desiccant 20 and has a closed upper end and an open lower end; and a cylindrical aluminum lower tank 12 that accommodates a filter 30, has a tank inflow port 13 and a tank outflow port 14 in a side section, and has an open upper end and a closed lower end. In the upper tank, a cylindrical opening section 11b is disposed at the lower end with a horizontal stepped section 11a interposed therebetween; a male threaded section 11c is formed on the outer periphery of the cylindrical opening section; a female threaded section 12c is formed on the inner periphery of an upper-end opening section of the lower tank; and the upper tank and the lower tank are joined by being screwed together, with packing 40 interposed between the horizontal stepped section of the upper tank and the upper-end opening section of the lower tank.

Description

Receiver tank for heat exchanger

The present invention relates to a receiver tank for a heat exchanger, and more specifically, to a receiver tank for an all-aluminum heat exchanger incorporated in an air conditioner installed in an automobile, a house, or the like.

Traditionally, all-aluminum with a pair of header pipes, each made of aluminum (including aluminum alloy), and a plurality of heat exchange tubes erected in parallel with each other between the header pipes, particularly with an overcooling section. The parallel flow heat exchanger is equipped with a receiver tank for gas-liquid separation of the refrigerant and storage of excess refrigerant. This receiver tank is usually enclosed with a filter for removing impurities in the refrigerant circuit and a desiccant for removing water in the refrigerant circuit (for example, Japanese Patent Application Laid-Open No. 2006-162189, Japanese Patent No. 4257027). See Gazette).

In the receiver tank for a heat exchanger described in JP-A-2006-162189, the upper tubular member (upper tank) and the lower tubular member (lower tank) whose upper end opening is closed by an end cap are made of aluminum (aluminum alloy). It is made of a member (including) and is brazed and joined.
Further, a structure is adopted in which a plug body supporting the filter is inserted into the insertion port of the lower tubular member (lower tank) via a seal member (O-ring) and sealed by a cylindrical surface seal.

The liquid tank (receiver tank) described in Japanese Patent No. 4257027 is provided with a bottomed tubular aluminum tank body provided with a desiccant filling portion and closed at the upper end, and a refrigerant inlet portion and a refrigerant outlet portion. It is made by welding and joining the aluminum block part.
The desiccant filling portion includes a filter provided on the bottom surface of the tank body, a lid member, a filter provided on the upper surface of the lid member, and a desiccant filled between the two filters.

However, since the receiver tanks described in JP-A-2006-162189 and Japanese Patent No. 4257027 are both made of aluminum, the weight is reduced in consideration of fuel efficiency and vibration resistance when used for automobiles. There is a need to. If the entire tank is made of aluminum, there is concern about corrosion when the usage environment is harsh.

Further, in the receiver tank described in Japanese Patent Application Laid-Open No. 2006-162189, since the compression ratio changes due to the dimensional fluctuation of the O-ring and the receiver tank, the sealing property becomes unstable, and there is a concern that liquid may infiltrate due to poor sealing. there were. Further, when inserting the O-ring into the tank, it is necessary to uniformly apply oil to the O-ring, and if the amount of oil applied is insufficient, the O-ring may be twisted at the time of insertion and a sealing failure may occur.

In addition, for maintenance (replacement of desiccant) inside the receiver tank, it is necessary to remove the stopper, and there is a concern that it will take time to replace the desiccant.

On the other hand, the receiver tank described in Japanese Patent No. 4257027 has a structure in which a desiccant is filled between the filter provided on the bottom surface of the tank body and the filter provided on the upper surface of the lid member. Since it is troublesome to install the desiccant in the tank and it is not possible to take out and replace only the desiccant, there is no choice but to replace the entire receiver tank, which is inefficient.

The present invention has been made in view of the above circumstances, and provides a receiver tank for a heat exchanger, which is lightweight, has improved corrosion resistance, facilitates assembly to ensure airtightness, and facilitates replacement of a desiccant. The challenge is to provide.

In order to achieve the above object, the present invention is in a parallel flow heat exchanger comprising a pair of header pipes, each made of aluminum, and a plurality of heat exchange tubes erected in parallel with each other between the header pipes. A receiver tank for a heat exchanger that is brazed to one of the header pipes via an inflow path and an outflow path of the refrigerant, and contains a desiccant for removing water from the refrigerant. It houses a tubular synthetic resin upper tank that opens and a filter that removes impurities containing the desiccant in the refrigerant, and has a tank inlet and a tank outlet on the side. The upper end is open and the lower end. The upper tank is provided with a tubular aluminum lower tank that closes the pipe, and the upper tank is provided with a tubular opening at the lower end via a horizontal step portion, and a male screw portion is provided on the outer periphery of the tubular opening. A female screw portion is formed on the inner circumference of the upper end opening of the lower tank, and a sealing member is interposed between the horizontal step portion of the upper tank and the upper end of the upper end opening of the lower tank. It is characterized in that the upper tank and the lower tank are connected by a screw connection.

With this configuration, the upper tank constituting the receiver tank is molded of synthetic resin, so that the weight can be reduced and the corrosion resistance can be achieved.
Further, an aluminum lower tank brazed to the header pipe and a synthetic resin upper tank are interposed between the horizontal step of the upper tank and the upper end of the upper end opening of the lower tank. The upper tank and the lower tank can be connected by brazing. Therefore, by using the flat surface fixing seal, the airtightness can be ensured and the connection can be made, and the upper tank and the lower tank can be easily assembled and removed.

In the present invention, the desiccant in a bag can be housed in the upper tank, in which case the filter comprises vertical sections that intersect each other to form equidistant side openings in the circumferential direction. The upper and lower collars fitted into the lower tank, which extend outward from the upper and lower ends of the vertical section, and the upper and lower collars extending downward from the center of the vertical section, respectively. A filter main body made of synthetic resin including a filter holding piece that can be elastically deformed by contact with the lower end closing portion of the lower tank, the side opening, the upper opening provided in the upper collar, and the lower collar. It is preferable to include at least a filter mesh made of synthetic resin stretched over the side opening of the lower openings provided in the portion.

With such a configuration, the desiccant can be easily stored in the upper tank, can be replaced more easily, and the filter for removing impurities in the refrigerant can be easily and surely attached. it can.

Further, in the present invention, the upper tank can be filled with a desiccant, and in this case, the filter has a vertical section that intersects with each other to form side openings at equal intervals in the circumferential direction. An upper collar that extends outward from the side end of the vertical section and is fitted into the lower tank, and a lower end of the lower tank that extends downward from the center of the vertical section. A filter main body made of synthetic resin including a filter holding piece that can be elastically deformed by contact with a closed portion, and a filter mesh stretched over an upper opening provided in the upper flange portion. Is preferable. In this case, it is preferable that the upper tank is formed with reinforcing ribs connecting at least two points on the inner surface of the upper tank in a longitudinal manner.

With such a configuration, the desiccant can be easily stored in the upper tank and replaced, and the desiccant is pulverized and impurities in the refrigerant due to the pulverization are removed. Installation can be done easily and securely.
In this case, the strength of the upper tank can be increased by forming reinforcing ribs connecting at least two points on the inner surface of the upper tank in a longitudinal manner.

Further, in the present invention, the lower tank is a lower tank main body formed of a profile having a thick portion having a joint surface having a concave arc-shaped horizontal cross section on one side of the cylindrical base portion, and the lower portion thereof. It is provided with an aluminum lower end closing cap that is brazed and joined in the lower end opening of the tank body, and a tank flow port and a tank outlet that form the refrigerant inflow path and the refrigerant outflow path are formed in the thick portion. It is good to have.

With this configuration, the concave arc-shaped joint surface integrally formed with the lower tank body can be easily joined to the header pipe and can be firmly joined.

Further, in the present invention, the lower tank is formed in a bottomed tubular shape having a lower end closing portion, and the inflow path and outflow of the refrigerant are formed in the refrigerant inflow port and the refrigerant outflow port formed in the side wall of the lower tank. It is preferable to braze and join the aluminum tank inflow pipe and tank outflow pipe forming the path.

With this configuration, the lower tank can be integrally molded into a bottomed tubular shape having a lower end closure portion, and the tank is joined to the refrigerant inlet and the refrigerant outlet formed in the side wall of the lower tank. It can be joined to the header pipe via the inflow pipe and the tank outflow pipe.

According to the present invention, since it is configured as described above, the following effects can be obtained.

(1) According to the first aspect of the present invention, by molding the upper tank constituting the receiver tank with a synthetic resin, the weight of the receiver tank can be reduced and corrosion resistance can be achieved.
Further, since a seal member can be interposed between the horizontal step portion of the upper tank and the upper end of the upper end opening of the lower tank, the upper tank and the lower tank can be connected by screw connection, so that the seal is a flat surface fixing seal. As a result, the airtightness can be ensured and the connection can be made, and the upper tank and the lower tank can be easily assembled and removed.

(2) According to the invention of claim 2, in addition to the above (1), the desiccant can be further easily contained in the upper tank, can be replaced more easily, and can be replaced in the refrigerant. It is possible to easily and reliably attach a filter that removes impurities.

(3) According to the invention of claim 3, in addition to the above (1), the desiccant can be further easily contained in the upper tank, can be easily replaced, and the desiccant powder can be easily replaced. It is possible to easily and reliably attach a filter that removes impurities in the refrigerant due to pulverization and pulverization.
In this case, the strength of the upper tank can be increased by forming reinforcing ribs connecting at least two points on the inner surface of the upper tank in a longitudinal manner (claim 4).

(4) According to the invention of claim 5, the concave arc-shaped joint surface integrally formed with the lower tank body can be easily joined to the header pipe and can be firmly joined. In addition to the above (1) to (3), the brazing joint between the header pipe and the receiver tank can be easily and strengthened.

(5) According to the invention of claim 6, the lower tank can be integrally molded in a bottomed tubular shape having a lower end closing portion, and the refrigerant inlet and the refrigerant flow formed in the side wall of the lower tank. Since it can be joined to the header pipe via the refrigerant inflow pipe and the refrigerant outflow pipe joined to the outlet, in addition to the above (1) to (3), the weight of the receiver tank can be further reduced.

It is a schematic front view which shows the use state of an example of the receiver tank for a heat exchanger which concerns on this invention. A cross-sectional view (a) showing a joint portion between a header pipe and a receiver tank containing a desiccant in a bag in the present invention, an enlarged cross-sectional view (b) along the line I-I of (a), and an enlarged portion II of (a). It is a cross-sectional view (c). It is sectional drawing (d) along line III-III of the front view (a), the plan view (b), the bottom view (c) and (a) of the filter in this invention. It is an exploded perspective view which shows the upper tank, the lower tank and a seal member in this invention. Cross-sectional views (a) showing a joint portion between a header pipe and a receiver tank filled with a desiccant in the present invention, enlarged cross-sectional views (b) along the IV-IV line of (a), and enlarged cross-sectional view of the V portion of (a). (C). It is a front view (a), a plan view (b) and a bottom view (c) of another filter in this invention. A front view (a), a bottom view (b), a cross-sectional view (c) along the VI-VI line of (a), and a cross-sectional view of yet another upper tank showing a part of another upper tank in the present invention. (D). It is sectional drawing which shows the joint part of another lower tank and a header pipe in this invention. It is a perspective view which shows a part of the said lower tank in cross section.

Hereinafter, a mode for carrying out the present invention will be described in detail based on the attached drawings.

<First Embodiment>
As shown in FIGS. 1 and 2, the heat exchanger receiver tank (hereinafter referred to as a heat exchanger) according to the present invention has a pair of substantially cylindrical header pipes 2a and 2b, each made of aluminum, and these headers. A heat exchanger main body 1 having a plurality of heat exchange tubes 3 parallel to each other installed between pipes 2a and 2b and corrugated fins 4 interposed between adjacent heat exchange tubes 3, and moisture in a refrigerant. A substantially cylindrical receiver tank 10 made of aluminum provided with a bagged desiccant 20 to be removed and a filter 30 to remove impurities in the refrigerant, one of the header pipes 2a and 2b 2b and the receiver tank 10 Is integrally joined by brazing.
For example, molecular sieve is used as the desiccant, and it is housed in a bag made of polyethylene-terephthalate (PET).

The header pipes 2a and 2b are formed in a substantially cylindrical shape by, for example, an extruded aluminum profile, and a cap member 2c is adhered and fixed to the upper and lower ends thereof. Further, a refrigerant inflow pipe 6a is connected to, for example, near the outer upper end of one header pipe 2a (left side in FIG. 1), and a refrigerant outflow pipe 6b is connected near the outer lower end. ..

Further, as shown in FIG. 2, on the side wall of the header pipe 2b, a refrigerant outlet 7 and a refrigerant inlet 8 are provided at two upper and lower locations in order to communicate with the receiver tank 10, and these refrigerants are provided. The receiver tank 10 is integrally brazed to the header pipe 2b via the inflow path and the outflow path of the refrigerant so as to communicate with the outflow port 7 and the refrigerant inflow port 8.

A partition plate 2d that separates the refrigerant outlet 7 side and the refrigerant inlet 8 side is provided on the lower side of the header pipe 2b, and is provided at the same position as the partition plate 2d on the lower side of the other header pipe 2a. A supercooled portion (supercooled region) is formed by the heat exchange tube 3 on the lower stage side partitioned by the partition plate 2e. The header pipe 2b is provided with a partition plate 2f that separates the upper end side of the header pipe 2b from the refrigerant outlet 7 side, and the header pipe 2a is located above the partition plate 2f and is located on the refrigerant inflow pipe 6a side. A partition plate 2g that separates the partition plate 2e from the partition plate 2e is provided.

Further, the heat exchange tube 3 is made of an extruded aluminum material, for example, in the shape of a flat plate, and inside the heat exchange tube 3, a plurality of partitioned refrigerant flow paths penetrating in the longitudinal direction (shown). Is formed. Both ends of the heat exchange tube 3 thus formed are inserted and fixed to a plurality of slits (not shown) arranged in parallel with each other at appropriate intervals on opposite sides of the side surfaces of both header pipes 2a and 2b. Has been done.

As shown in FIG. 1, the corrugated fin 4 is formed in a continuous wave shape by bending an aluminum plate material, and is brazed by being interposed between the heat exchange tubes 3. In this case, corrugated fins 4 are also brazed to the outer side of the heat exchange tubes 3 arranged at the uppermost stage and the lowermost stage, and both corrugated fins 4 are brazed to protect both corrugated fins 4. A side plate 5 is brazed to the outer side of the above.

The receiver tank 10 contains a cylindrical synthetic resin upper tank 11 containing a desiccant 20 in a bag for removing water from the refrigerant, the upper end of which is closed and the lower end of which is open, and impurities containing the desiccant in the refrigerant. A tubular aluminum lower part that accommodates the filter 30 to be removed and has a tank inflow port 13 and a tank outflow port 14 that form a refrigerant inflow path and a refrigerant outflow path on the side, and the upper end is open and the lower end is closed. It is equipped with a tank 12.

As shown in FIG. 4, the upper tank 11 is provided with a tubular opening 11b at the lower end via a horizontal step portion 11a, and a male screw portion 11c is formed on the outer periphery of the tubular opening 11b.

On the other hand, as shown in FIG. 4, the lower tank 12 is formed of an extruded shape member having a thick portion 12d having a joint surface 12b having a concave arcuate horizontal cross section on one side of the cylindrical base portion 12a. A lower tank body 12e and an aluminum lower end closing cap 12f brazed to the lower end opening of the lower tank body 12e are provided, and a tank inlet 13 and a tank outlet 14 are formed in a thick portion 12d. ing. A female screw portion 12c that can be screwed with a male screw portion 11c provided in the tubular opening 11b is formed on the inner circumference of the upper end opening of the lower tank 12.

A packing 40, which is a sealing member, is interposed between the horizontal step portion 11a of the upper tank 11 and the upper end of the upper end opening of the lower tank 12, and the upper tank 11 and the lower tank 12 are connected by screw coupling. The receiver tank 10 is formed. Although the case where the sealing member is the packing 40 has been described here, an O-ring may be used in addition to the packing 40.

As shown in FIG. 3, the filter 30 extends outward from the upper and lower ends of the vertical section 31 intersecting with each other to form lateral openings at equal intervals in the circumferential direction. The upper flange portion 32 and the lower flange portion 33 fitted into the lower tank 12 extend downward from the center of the vertical section 31, and can be elastically deformed by contact with the lower end closing cap 12f of the lower tank 12. A synthetic resin filter main body 35 including a filter pressing piece 34, and a synthetic resin filter mesh 36 stretched to a side opening.
In this case, the filter holding piece 34 may be manufactured in a columnar shape having the same diameter in order to have elastic deformation, and the entire filter holding piece 34 may be bent, or a small diameter portion may be provided at the tip. Deformation may occur in a specific part.

The filter mesh 36 may be stretched at least in the side opening, and may be stretched in the upper opening provided in the upper flange 32 and / or the lower opening provided in the lower flange 33. As described above, by extending the filter mesh 36 to the upper opening provided in the upper flange portion 32 and / or the lower opening provided in the lower flange portion 33 in addition to the side opening, the impurity removing performance is improved. ..

The filter 30 formed as described above is inserted into the lower tank 12 when the upper tank 11 and the lower tank 12 are connected, and the lower end closing cap 12f is screwed to connect the upper tank 11 and the lower tank 12. Presses the filter holding piece 34, and the elastic force due to the elastic deformation of the filter holding piece 34 acts to bring the upper flange portion 32 into close contact with the tip surface of the tubular opening 11b of the upper tank 11.

Next, the procedure for manufacturing the heat exchanger will be described.
First, the joint surface 12b of the lower tank 12 is brought into contact with the joint surfaces around the refrigerant outlet 7 and the refrigerant inlet 8 for temporary assembly.

Next, the corrugated fin 4, the heat exchange tube 3 and the other header pipe 2b are assembled to the header pipe 2a and fixed with a jig. After applying flux to the fixed heat exchanger main body 1 and lower tank 12, carry it into the furnace and heat it at a predetermined temperature, for example, 600 ° C. to integrate the heat exchanger main body 1 and the lower tank 12. Braze.

The filter 30 is inserted into the lower tank 12 integrally brazed to the heat exchanger body 1, while the bagged desiccant 20 is housed in the upper tank 11, and then the horizontal step 11a and the lower part of the upper tank 11 A packing 40 is interposed between the upper end of the upper end opening of the tank 12 and the upper tank 11 and the lower tank 12 are connected by a screw connection to end the production of the receiver tank for the heat exchanger.

<Second Embodiment>
In the second embodiment, instead of the receiver tank 10 of the first embodiment, the upper tank 11 is filled with the desiccant 20A, and the lower tank 12 is pulverized and removed in the refrigerant as the desiccant 20A is pulverized. It is a receiver tank 10A containing a filter 30A for removing impurities mixed in.

As shown in FIGS. 5 and 6, the filter 30A in the second embodiment has a vertical section 31A that intersects with each other to form side openings at equal intervals in the circumferential direction, and a vertical section 31A outside the side end of the vertical section. The upper flange portion 32 fitted into the lower tank 12 extending toward the direction and the upper flange portion 32 extending downward from the center of the vertical section 31A are elastically deformed by contact with the lower end closing cap 12f of the lower tank 12. The filter main body 35A made of synthetic resin including the possible filter pressing piece 34, and the filter mesh 36 stretched to the upper opening provided in the upper flange portion 32 are provided.

The filter 30A formed as described above is inserted into the lower tank 12 when the upper tank 11 and the lower tank 12 are connected, and the upper tank 11 on the lower side and the lower tank on the upper side are arranged upside down. By screw-coupling with 12, the lower end closing cap 12f presses the filter holding piece 34, and the elastic force due to the elastic deformation of the filter holding piece 34 acts to open the upper flange 32 to the tubular opening of the upper tank 11. It is fitted into the base end portion of the portion 11b and comes into close contact with the desiccant 20A. As a result, the desiccant 20A is fixed in the upper tank 11, so that the desiccant 20A can be suppressed from being pulverized. A slight amount of pulverization and impurities in the refrigerant due to pulverization can be removed by the filter 30A.

In the manufacturing procedure of the heat exchanger having the receiver tank 10A of the second embodiment, the positions of the upper tank 11 and the lower tank 12 when the upper tank 11 and the lower tank 12 are connected are upside down, that is, the desiccant 20A is filled. The same applies except that the upper tank 11 is located below and the lower tank 12 into which the filter 30A is inserted is located above and connected, and thus the description thereof will be omitted.

Instead of the upper tank 11 constituting the receiver tank 10A of the second embodiment, the upper tank 11A integrally formed with the reinforcing ribs 11d as shown in FIG. 7 may be used.
In this case, the upper tank 11A can be made stronger by forming the reinforcing ribs 11d that connect the four points on the inner surface of the upper tank 11A in the longitudinal direction (FIGS. 7A, 7B, 7C). reference).
The reinforcing rib 11d may be connected to at least two locations on the inner surface of the upper tank 11A, and may have a structure as shown in FIG. 7D.

<Third Embodiment>
In the third embodiment, the lower tank 12A is formed in a bottomed tubular shape having a lower end closing portion 12g, and the refrigerant is provided at the tank inlet 13 and the tank outlet 14 formed in the side wall of the lower tank 12A. This is a case where the tank inflow pipe 13A and the tank outflow pipe 14A made of aluminum forming the inflow passage and the outflow passage of the above are brazed and joined. In this case, with the tank inflow pipe 13A and the tank outflow pipe 14A inserted into the tank inflow port 13 and the tank outflow port 14 of the lower tank 12A, the ends of the tank inflow pipe 13A and the tank outflow pipe 14A are fixed by caulking. And then brazing and joining.
In this case, the tank inflow pipe 13A and the tank outflow pipe 14A can be formed of a clad material having a brazing material layer, or can be brazed in a furnace by placing it on a dough material.

The lower tank 12A formed as described above is brazed to the header pipe 2b via the tank inflow pipe 13A and the tank inflow pipe 14A.

When connecting the lower tank 12A and the upper tank 11 of the third embodiment, the filter 30 is inserted into the lower tank 12, and the upper tank 11 and the lower tank 12 are screwed together so that the lower end closing portion 12g presses the filter. The piece 34 is pressed, and the elastic force due to the elastic deformation of the filter holding piece 34 acts to bring the upper flange portion 32 into close contact with the tip surface of the tubular opening 11b of the upper tank 11.
When the lower tank 12A of the third embodiment and the upper tank 11 filled with the desiccant 20A are connected, the lower end closing portion 12g presses the filter holding piece 34, and the filter holding piece 34 is elastically deformed. The elastic force acts to insert the upper flange portion 32 into the base end portion of the tubular opening 11b of the upper tank 11 and bring it into close contact with the desiccant 20A.

In the third embodiment, other parts are the same as those in the first embodiment, so the same parts are designated by the same reference numerals and the description thereof will be omitted.

According to the receiver tanks 10 and 10A of the above embodiment, since the upper tanks 11 and 11A are made of synthetic resin, the weight of the receiver tanks 10 and 10A can be reduced and the corrosion resistance can be improved.
Further, the upper tanks 11, 11A and the lower tanks 12, 12A are screwed together with the packing 40 interposed between the horizontal step portion 11a of the upper tanks 11, 11A and the upper end of the upper end opening of the lower tanks 12, 12A. By using a flat fixing seal, the airtightness can be ensured and the upper tanks 11 and 11A and the lower tanks 12 and 12A can be easily assembled and removed. Can be.

Further, the desiccants 20 and 20A can be easily accommodated in the upper tanks 11 and 11A, and the replacement can be further facilitated, and the filters 30 and 30A for removing impurities in the refrigerant can be easily and surely attached. can do.

Further, the desiccants 20 and 20A can be easily stored in the upper tanks 11 and 11A and replaced easily, and the desiccants 20 and 20A are pulverized and impurities in the refrigerant due to the pulverization are removed. It is possible to easily and surely attach the filters 30 and 30A.

Claims (6)

1. Refrigerant inflow path and outflow to one of the header pipes in a parallel flow heat exchanger including a pair of header pipes each made of aluminum and a plurality of heat exchange tubes erected in parallel with each other between the header pipes. A receiver tank for heat exchangers that is brazed and joined via a path.
   A tubular synthetic resin upper tank that closes the upper end and opens the lower end, which contains the desiccant that removes the moisture of the refrigerant.
   A tubular aluminum lower tank containing a filter for removing impurities containing the desiccant in the refrigerant, having a tank inlet and a tank outlet on the side, an upper end opening and a lower end closing. Equipped with
   The upper tank is provided with a tubular opening at the lower end via a horizontal step portion, and a male screw portion is formed on the outer periphery of the tubular opening.
   A female thread is formed on the inner circumference of the upper end opening of the lower tank.
   A sealing member is interposed between the horizontal step portion of the upper tank and the upper end of the upper end opening of the lower tank, and the upper tank and the lower tank are connected by a screw connection.
   A receiver tank for heat exchangers.
2. In the heat exchanger receiver tank according to claim 1.
   A bag of desiccant is stored in the upper tank.
   The filter fits into a vertical section that intersects with each other to form equidistant side openings in the circumferential direction and a lower tank that extends outward from the upper and lower ends of the vertical section. A synthetic resin comprising an upper flange portion and a lower flange portion to be inserted, and a filter retainer piece extending downward from the center portion of the vertical section and elastically deformable by contact with the lower end closing portion of the lower tank. Filter body, and a synthetic resin filter stretched over at least the side opening of the side opening, the upper opening provided in the upper collar, and the lower opening provided in the lower collar. A receiver tank for a heat exchanger, which is characterized by being provided with a mesh.
3. In the heat exchanger receiver tank according to claim 1.
   The upper tank is filled with a desiccant,
   The filter is fitted into a vertical section that intersects with each other to form equidistant side openings in the circumferential direction and a lower tank that extends outward from the side end of the vertical section. A filter body made of synthetic resin comprising an upper flange portion to be formed and a filter holding piece extending downward from the central portion of the vertical section and elastically deformable by contact with the lower end closing portion of the lower tank. A receiver tank for a heat exchanger, which comprises a filter mesh stretched in an upper opening provided in the upper flange portion.
4. In the receiver tank for heat exchanger according to claim 3.
   The upper tank is a receiver tank for a heat exchanger, characterized in that reinforcing ribs connecting at least two locations on the inner surface of the upper tank are formed in a longitudinal manner.
5. In the receiver tank for heat exchanger according to any one of claims 1 to 4.
   The lower tank has a lower tank main body formed of a profile having a thick portion having a joint surface having a concave arc-shaped horizontal cross section on one side of a cylindrical base portion and a lower end opening of the lower tank main body. It is characterized in that it is provided with an aluminum lower end closing cap that is brazed and joined, and a tank flow port and a tank outflow port that form the refrigerant inflow path and the refrigerant outflow path are formed in the thick portion. Receiver tank for heat exchanger.
6. In the receiver tank for heat exchanger according to any one of claims 1 to 4.
   The lower tank is made of aluminum, which is formed in a bottomed tubular shape having a lower end closing portion, and forms an inflow path and an outflow path of the refrigerant at a refrigerant inlet and a refrigerant outlet formed in a side wall of the lower tank. A receiver tank for a heat exchanger, characterized in that the tank inflow pipe and the tank outflow pipe are brazed and joined.

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