JP2927006B2 - Heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger, and more particularly to a heat exchanger in which a gaseous heat medium is condensed by heat exchange and liquefied like a condenser for a cooler.

2. Description of the Related Art As a heat exchanger used for a condenser for a car cooler or the like, a pair of header pipes which are arranged at both ends of the heat exchanger with their length directions parallel to each other are arranged perpendicular to the length direction of the header pipe. It is widely known that the plurality of tubes communicate with each other and fins for heat exchange are connected between the tubes. These conventional heat exchangers
A receiver tank communicating with a heat medium outlet formed in the header pipe is provided adjacent to the heat tank, and the heat exchanger stores the condensed heat medium and removes the gaseous heat medium from the liquid heat medium. Then, it is customary to circulate through the heat cycle circuit.

[0002]

In the above heat exchanger, the receiver tank is provided separately, and it takes time to connect the heat exchanger and the receiver tank. Therefore, it has been proposed to connect the head pipe and the receiver tank by integrally molding the head pipe and the receiver tank (Japanese Utility Model Laid-Open No. 2-139).
In the header tank, the gaseous heat medium and the condensed and liquefied heat medium flow in the inner cavity, whereas the receiver tank stores the condensed and liquefied heat medium. Since the two functions are separate, the conventional heat exchanger has a configuration in which the receiver tank is made independent of the heat exchanger, resulting in an increase in the overall size. Therefore, an object of the present invention is to provide a heat exchanger in which a receiver tank is integrally provided within a range of front dimensions of a conventional heat exchanger.

[0003]

SUMMARY OF THE INVENTION The present invention relates to a heat exchanger of the type in which a plurality of tubes are arranged between header pipes arranged at an upper portion and a lower portion, with a plurality of tubes being parallel to each other with the longitudinal direction thereof being vertical. Then, the lumen of the upper header pipe is partitioned by a partition wall, and the lumen of the upper header pipe is partitioned into first and second at least two independent compartments adjacent to each other in the longitudinal direction. And knitting the plurality of tubes into at least three groups, and connecting the first group of tubes to the first compartment of the upper header pipe and the inner cavity of the lower header pipe; The second group of tubes communicates with the second compartment of the upper header pipe and the lumen of the lower header pipe communicating with the first group of tubes, and the third group of tubes further communicates with the upper group of tubes. A second compartment of the header pipe and a receiver tank which is adjacent to a longitudinal end of the lower header pipe and communicates with a receiver tank which is independent of a lumen of the lower header pipe are communicated with each other. A stirrer is provided immediately below the lower end opening of the third tube group to provide stirring and mixing to the heat medium flowing down from the tube group.

[0004]

According to the present invention, the heat medium introduced into the first compartment of the upper header pipe flows into the lower header pipe through the first tube group, and then flows through the lower header pipe through the second tube group. It flows into the second compartment of the upper header pipe and from the second compartment through the third group of tubes into the receiver tank. During this time, the heat medium exchanges heat with the air flowing between the tubes and the fins connected between the tubes by the cross-flow type flow, and is condensed, so that most of the gaseous heat medium is condensed. It liquefies and flows down to the receiver tank from the lower end of the third tube group, which is the last passage in the heat medium heat exchanger, and the liquefied heat medium is stored in the receiver tank and recirculated from the heat medium outlet to the heat cycle circuit. I'm sullen.

In the receiver tank, a stirrer for imparting a stirring and mixing action to the heat medium flowing down is provided immediately below a lower end opening of a tube constituting the third tube group, thereby providing the receiver with a stirrer. The gaseous heat medium is separated from the liquefied heat medium in the heat medium that has flowed down into the tank, and the uncondensed heat medium is separated from the liquefied heat medium stored in the receiver tank.

[0006]

1 is a sectional front view of an embodiment in which the present invention is applied to a condenser for a car cooler, and FIG. 2 is an exploded perspective view of a main part thereof. In the figure, an upper header pipe 1 has a hollow cylindrical metal pipe body 2 having a length extending over the entire width as viewed from the front of the condenser, end plates 3 and 3 for closing both ends of the pipe body 2, and the inside of the pipe body 2. It comprises a partition wall 4 for partitioning the cavity into a first compartment 5 and a second compartment 6, and a refrigerant inlet 7 communicating with the first compartment 5. The lower header pipe 8 is shorter than the length of the pipe body 2, and is a hollow cylindrical metal pipe body 9 having a length of about ／ thereof.
, And an end plate 10 closing one end thereof. A receiver tank 11 is connected to the other end of the pipe main body 9 of the lower header pipe 8. The receiver tank 11 includes a hollow cylindrical metal pipe body 12 having a diameter larger than the pipe body 9 of the lower header pipe 8, and one end of the pipe body 12 and the other end of the pipe body 9 of the lower header pipe 8. It comprises a connecting plate 14 which is closed to form a flow chamber 13 in the pipe body 9 and an end plate 16 which closes the other end of the pipe body 12 of the receiver tank 11 and forms a storage chamber 15 in the pipe body 12. A refrigerant outlet 17 is provided in the end plate 16.

The pipe main body 9 of the lower header pipe 8 and the pipe main body 12 of the receiver tank 11 are fixed in series via a connecting plate 14 so that the lowermost ends thereof are aligned with each other. From the pipe body 12
Is equal to the distance between the end plates 3 at both ends of the pipe body 2 of the upper header pipe 1. That is, the total length of the connected lower header pipe 8 and the receiver tank 11 is made equal to the length of the upper header pipe 1.

The upper header pipe 1, the lower header pipe 8, and the receiver tank 11 are arranged parallel to each other with their longitudinal directions (central axis directions) being horizontal, and between the upper header pipe 1 and the lower header pipe 8, and between the upper header pipe 1 and the upper header pipe 1. A plurality of metal tubes 18 are arranged vertically and in parallel with each other between the receiver tank 11 and the inner space of the pipe body 2 of the upper header pipe 1 and the lower header pipe 8 and The lumens of the pipe bodies 9 and 12 of the receiver tank 11 are communicated. Also, on both sides of these tubes 18,
The side plate 19,
The upper header pipe 1 is connected to the pipe bodies 2 and 9 of the lower header pipe 8 and the upper header pipe 1 is connected to the pipe bodies 2 and 12 of the receiver tank 11. Heat radiation fins 20 are mounted between the tubes 18 and between the tubes 18 and the side plates 19, 19. The fixing of the tube 18 to each of the pipe bodies 2, 9, 12 and the fixing of the radiation fin 20 are the same as in the prior art.

The plurality of tubes 18 include a first group of tubes 21 communicating the first compartment 5 of the upper header pipe 1 and the flow chamber 13 of the lower header pipe 8, and a second compartment of the upper header pipe 1. 6 and a third tube group 23 which communicates the flow chamber 13 of the lower header pipe 8 with the second compartment 6 of the upper header pipe 1 and the storage chamber 15 of the receiver tank 11. It is divided into three groups. The lower end of each tube 18 constituting the third tube group 23 opens into the storage chamber 15 at the highest part of the receiver tank 11. In the embodiment shown in FIG. 1, each tube group is constituted by four tubes 18. The high-temperature and high-pressure gaseous refrigerant introduced from the compressor through the refrigerant inlet 7 into the first compartment 5 of the upper header pipe 1 of the condenser passes through the first tube group 21 to the flow chamber 13 of the lower header pipe 8. And flows into the second compartment 6 of the upper header pipe 1 from the flow chamber 13 via the second tube group 22, and from the second compartment 6 to the receiver via the third tube group 23. It flows down into the storage chamber 15 of the tank 11. While the gaseous refrigerant flows through each tube group, heat is exchanged with the air flowing between the radiation fins 20 and the tubes 18, condensed, and vertical type cross-flow heat exchange is performed.

In the final stage of cooling down from the second compartment 6 of the upper header pipe 1 to the storage chamber 15 of the receiver tank 11 via the third tube group 23, each of the tubes constituting the third tube group 23 is formed. Within 18, there is a two-phase flow of liquid refrigerant flowing down the tube inner wall and uncondensed gaseous refrigerant flowing down the center of the tube. Therefore, each tube 18 of the third tube group 23 opening at the highest part of the storage chamber 15 of the receiver tank 11 is provided.
The stirrer 24 is fixed to the connecting plate 14 and the end plate 16 at both ends at a position directly below the opening end of the stirrer 24. The stirring body 24 is
The figure shows a punched metal having a large number of holes wound in a cylindrical or spiral shape. Third Tube Group 2
3 to the storage chamber 15 from the lower end opening of each tube 18.
The liquid refrigerant flowing down into the inside collides with and is stirred by the stirring body 24, and the uncondensed gaseous refrigerant is further condensed by the supercooled refrigerant, and drops into the storage chamber 15. As a result, the gaseous refrigerant confined in the liquid-phase refrigerant is separated, the generation of air bubbles in the liquid-phase refrigerant is also suppressed, and the liquid refrigerant is placed in the lower layer of the storage chamber 15 as uncondensed gas. The liquid refrigerant is stored in the upper layer, and the liquid refrigerant, which is gas-liquid separated and the gaseous refrigerant is not confined in the form of bubbles, is supplied from a refrigerant outlet 17 communicating with the lower part of the storage chamber 15 to the next-stage expansion valve. Sent out to

The agitator 24 has a function of agitating and mixing a gas-liquid two-phase refrigerant. In addition to the punch metal wound in a cylindrical or spiral shape, the punch metal is bent several times to form several layers. A folded one, a spirally wound metal wire, or the like can be used. The stirrer 24 is bridged between the connecting plate 14 and the end plate 16 as shown in the drawing, so that one stirrer 24 corresponds to all the tubes 18 of the third tube group 23 and a receiver tank. One stirrer 24 may correspond to each tube 18 of the third tube group 23 by bridging between the cylindrical walls of the 11 pipe bodies 12.

In the above-described embodiment, the upper header pipe 1, the lower header pipe 8, and the receiver tank 11
A plurality of tubes 18 that communicate with each other are formed into a group of three tubes to constitute a vertical-type cross-flow type refrigerant heat exchange passage shown in FIG. In the present invention, the passage of the refrigerant, which is constituted by the upper header pipe 1, the lower header pipe 8 and the tube 18, and finally reaches the receiver tank 11,
The final stage passage is connected to the receiver tank 11 by a tube 18 constituting a third tube group 23 extending vertically downward from the second compartment 6 of the upper header pipe 1 so that the receiver tank is connected to the heat exchanger. It has been successfully incorporated within. Thus, for example, FIG.
The flow chamber 13 of the lower header pipe 8 is
0 to divide into first and second flow chambers 31, 32,
The refrigerant inlet 7 is provided in the first flow chamber 31 of the lower header pipe 8.
And a fourth group of tubes 24 connecting the first flow chamber 31 with the first compartment 5 of the upper header pipe 1 to form a refrigerant passage shown in FIG. Is divided into two independent compartments 51 and 52 by a partition 44,
As described above, the flow chamber 13 of the lower header pipe 8 is divided into two independent flow chambers 31 and 32, and the plurality of tubes 18 are divided into the first and second tube groups 21, 32.
A fourth tube group 25 which connects the first flow chamber 31 and the compartment 52 between the second chamber 22 and the second tube group 25 and the second
When the fifth tube group 26 that communicates with the fluid chamber 32 is formed, the refrigerant passage shown in FIG. 5 can be formed.

[0013]

According to the present invention, the upper header pipe horizontally disposed at the upper position of the heat exchanger has at least two independent lumens of the first and second compartments separated by a partition wall. A first tube group that is formed in a compartment of the heat exchanger and communicates with the inner space of the lower header pipe arranged at a lower position of the heat exchanger in parallel with the upper header pipe to the first compartment; The inner cavity of the receiver tank, which is connected to a second group of tubes communicating with the second compartment and is disposed adjacent to one longitudinal end of the lower header pipe, is connected to the second header of the upper header pipe. Since the compartment and the third tube group communicate with each other, a heat medium passage communicating from the first compartment of the upper header pipe to the lower header pipe via the first tube group, and a heat medium passage extending from the lower header pipe to the third header group. A heat medium passage communicating with the second compartment of the upper Hetsudapaipu through the Chiyubu group, the second
And a heat medium passage communicating with the receiver tank through the third tube group from the compartment (3) is connected in series to form a long heat medium passage. The third tube group constituting the final stage of the heat medium passage extends vertically downward from the second compartment of the upper header pipe and communicates with the receiver tank. In the receiver tank, the third tube group is disposed. A stirrer that provides stirring and mixing to the heat medium flowing down from the tube corresponding to the opening is disposed directly below the lower end opening of the tube, so that the inside of each tube constituting the third tube group is provided. The gas-liquid two-phase heat medium that flows down into the receiver tank is stirred and mixed by the stirrer to promote the condensation of the uncondensed gas-phase heat medium and to form bubbles in the liquid-phase heat medium. Since the gas-phase heat medium confined in the gas tank is separated, the gas-liquid separation is promoted, the liquid heat medium subjected to the gas-liquid separation is stored in the lower part of the receiver tank, and the gaseous uncondensed heat medium is removed. Lesy Since it is stored in the upper part of the tank, the lower end of each tube constituting the third tube group is not immersed in the liquid heat medium, thereby increasing the flow resistance of the heat medium or causing pressure loss. Therefore, the receiver tank can be assembled integrally with the tube of the heat exchanger.

[Brief description of the drawings]

FIG. 1 is a cross-sectional front view of an embodiment in which a heat exchanger of the present invention is applied to a cooler condenser.

FIG. 2 is an exploded perspective view of a main part of the embodiment.

FIG. 3 is an explanatory diagram showing a flow of a refrigerant in the embodiment.

FIG. 4 is an explanatory diagram showing a flow of a refrigerant according to another embodiment.

FIG. 5 is an explanatory diagram showing a flow of a refrigerant according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper header pipe 4 Partition wall 5 1st compartment 6 2nd compartment 8 Lower header pipe 11 Receiver tank 13 Flow chamber 15 Storage chamber 18 Tube 21 1st tube group 22 2nd tube group 23 3rd tube group 24 Stirring body

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F25B 39 / 04,43 / 00 F28F 9/00-9/26

Claims (1)

(57) [Claims] 1. A plurality of tubes arranged vertically parallel to each other between two header pipes arranged parallel to each other in an upper part and a lower part in a horizontal direction.
In the heat exchanger in which the lumens of the header pipes are communicated with each other by the tube, the upper header pipe is divided by at least one partition so that the first and second compartments independent of each other are reduced. And a receiver tank that is adjacent to the lower header pipe and is independent of the lumen of the lower header pipe, and connects the plurality of tubes to the first compartment and the lower header pipe of the upper header pipe. A first tube group communicating with the cavity, a second tube group communicating the second compartment of the upper header pipe with the inner cavity of the lower header pipe, and a second compartment of the upper header pipe. The receiver tank is divided into at least three groups including a third tube group that communicates with the bore of the receiver tank, and the receiver tank has an opening in the bore of the tank. A stirrer is provided directly below the lower end opening of the tube of the third tube group so as to correspond to the opening and imparts a stirring and mixing action to the heat medium flowing down from the tube. Exchanger.