JPH0674609A - Heat exchanger - Google Patents

Abstract

PURPOSE:To provide a heat exchanger comprising a cylindrical hollow header, a refrigerant inlet pipe communicated with and connected to a refrigerant flowing-in chamber of the header and a plurality of tubes communicated with and connected to the refrigerant flowing-in chamber in which the refrigerant flowed from the refrigerant inlet pipe into the refrigerant flowing-in space of the header can be efficiently divided to flow into the tubes. CONSTITUTION:A refrigerant flowing-in chamber 31 is partitioned into more than two flowing-in partitioned chambers 31a and 31a in a longitudinal direction of a header 3 and concurrently a refrigerant inlet pipe 9 is formed into the corresponding number of branched pipes 9a and each of the branched pipes 9a is connected to each of the flowing-in partitioned chambers 31a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger used for condensers such as car air conditioners, evaporators and other applications.

[0002]

2. Description of the Related Art As a heat exchanger as described above, for example,
A so-called parallel flow type in which a pair of cylindrical hollow headers arranged in parallel are connected to both ends of a plurality of parallel tubes, and a refrigerant inlet pipe and an outlet pipe are connected to predetermined positions of the header. What is called is conventionally known.

In such a heat exchanger, as shown in FIG.
The refrigerant that has flowed from the refrigerant inlet pipe (101) into the refrigerant inflow chamber (102) of the header (100) is divided into a plurality of tubes (103) communicating with the refrigerant inflow chamber (102), and then composed of a group of tubes. Through a refrigerant outlet pipe (not shown) to flow out of the device. In FIG. 5, (104) is a corrugated fin arranged between adjacent tubes and outside the outermost tube, (105) is a side plate arranged outside the outermost corrugated fin, and (106) is a header. It is a partition plate that separates the lengthwise direction.

[0004]

However, in the conventional heat exchanger as described above, the refrigerant flowing from the refrigerant inlet pipe (101) into the refrigerant inflow chamber (102) of the header (100) is transferred to the tubes (103). It was practically difficult to divide the flow evenly in the above). Specifically, as shown in FIG.
When the refrigerant inlet pipe is connected to the upper part of the refrigerant inflow chamber, as shown by the arrow in the figure, the refrigerant is not sufficiently divided into the lower tube communicating with the inflow chamber, and the refrigerant inlet pipe is connected to the refrigerant inflow chamber. However, if the refrigerant inlet pipe is connected to the lower part of the refrigerant inflow chamber, the refrigerant distribution to the upper and lower tubes is not sufficient, and the refrigerant distribution to the upper tube is not sufficient. Particularly, in a heat exchanger in which a partition is provided in the header and the refrigerant flow passage is formed in a meandering circuit, particularly when used as a condenser, efficient heat exchange according to the gas-liquid state of the refrigerant is performed. Therefore, the number of tubes forming the passage group may be changed to set the passage cross-sectional area on the refrigerant inlet side larger than that on the refrigerant outlet side (for example, Japanese Patent Publication No. 3-45300). Thus, in this case, since the number of tubes connected to the refrigerant inflow space increases, there is a disadvantage that the split flow is further deteriorated, and there is a problem that the advantage of the meandering circulation of the refrigerant cannot be fully utilized. there were.

The present invention has been made in view of the above technical background, and provides a heat exchanger capable of efficiently dividing the refrigerant flowing from the refrigerant inlet pipe into the refrigerant inflow space of the header into the tubes. With the goal.

[0006]

In order to achieve the above object, the present invention provides a tubular hollow header (3) and a refrigerant inflow chamber (31) of the header as shown with reference to the drawings. In a heat exchanger including a refrigerant inlet pipe (9) connected in communication and a plurality of tubes (1) connected in communication with the refrigerant inflow chamber (31), the refrigerant inflow chamber (31) has a long header. It is divided into two or more inflow partition chambers (31a) (31a) in the vertical direction, and a corresponding number of branch pipes (9a) (9a) are formed in the refrigerant inlet pipe (9), and each branch pipe (9a) is formed. The gist is a heat exchanger characterized by being connected to each inflow partition chamber (31a).

[0007]

[Function] The refrigerant sent through the refrigerant inlet pipe (9) flows through the branch pipes (9a) (9a) into the vertical inflow partition chambers (31a) (31a) of the header (3), and then To the tube (1) connected to the inflow partition chamber (31a). Thus, since the branch pipes (9a) (9a) are connected to the respective inflow partition chambers (31a) (31a), as compared with the case where one refrigerant inlet pipe is connected to one refrigerant inflow chamber, The number of tubes per branch pipe (9a) is reduced, and a large amount of refrigerant is evenly distributed to each tube (1).

[0008]

Next, the present invention will be described based on an embodiment applied to a condenser made of aluminum (including its alloy) for a car air conditioner.

In FIGS. 1 to 3, (1) is a plurality of aluminum tubes horizontally arranged in parallel in the vertical direction, and (2) is an aluminum tube interposed between adjacent tubes (1) and (1). It is a corrugated fin. The tube (1) is composed of a flat extruded shape member made of an aluminum material. As the tube (1), a porous tube called a so-called harmonica tube is used. Further, an electric resistance welded tube may be used instead of the extruded shape member. The corrugated fin (2) has almost the same width as the tube (1) and is joined to the tube by brazing. The corrugated fins (2) are preferably cut and raised louvers.

(3) and (4) are left and right headers. Each of these headers (3) and (4) is formed by one aluminum electric resistance welded tube having a circular cross section. In each header, tube insertion holes are formed at intervals along the length direction, both ends of each tube (1) are inserted in the holes, and firmly joined and connected by brazing. Further, the left header (3) is provided with two aluminum partition plates (5) and (6) at positions above and below the middle portion in the longitudinal direction, and the inside of the left header (3) is at the upper side. It is partitioned into a refrigerant inflow chamber (31), an intermediate refrigerant inversion chamber (32), and a lower refrigerant outflow chamber (33). Further, as shown in detail in FIG. 2, the refrigerant inflow chamber (31) is partitioned into upper and lower inflow partition chambers (31a) (31a) by a partition plate (8) provided at substantially the center of the length direction. The branch pipes (9a) and (9a) of the refrigerant inlet pipe (9) having a bifurcated end are provided in the inflow partition chambers (31a).
Are connected to each other at a substantially central position in the longitudinal direction. A refrigerant outlet pipe (10) is connected to the refrigerant outflow chamber (33) in a communicating state. On the other hand, the right header (4) has the upper and lower partition plates (5) of the left header (3).
An aluminum partition plate (7) is provided at an intermediate height position of (6). Such partition plate (5)
(6) Due to the installation of (7), all the refrigerant passages formed by the tube group are the inlet side passage group (A), the outlet side passage group (D), and the upper and lower intermediate passage groups located in the middle thereof. (B) and (C), and the entrance side passage group (A) is further divided into two passage groups (A1) and (A) by the partition plate (8).
It is divided into 1). Moreover, in this embodiment, by changing the number of tubes (1) forming each passage group, the passage cross-sectional area of each passage group is set to be gradually smaller from the inlet side to the outlet side. It is said that efficient heat exchange can be performed without waste according to the volume of the refrigerant that undergoes a phase change from a gasification state to a liquid as heat exchange progresses. Note that (11) and (12) shown in FIG. 1 are upper and lower lids of the left and right headers, and (13) and (14) are upper and lower side plates arranged outside the outermost corrugated fins.

In the condenser according to the illustrated embodiment, the refrigerant sent through the refrigerant inlet pipe (9) has branch pipes (9a) (9a).
Through the inlet and outlet compartments (31a) above and below the left header (3)
After flowing into (31a), from here the entrance side passage group (A)
It divides into the tube (1) which comprises. Thus, since the branch pipes (9a) (9a) are connected to the respective inflow partition chambers (31a) (31a), as compared with the case where one refrigerant inlet pipe is connected to one refrigerant inflow chamber, The number of tubes per branch pipe (9a) can be reduced, so that a large amount of refrigerant can be evenly divided in each tube (1).

The refrigerant divided into the tubes (1) from the upper and lower inflow partition chambers (31a) (31a) passes through the upper and lower inlet side passage groups (A1) (A1) to the right as shown in FIG. It reaches the header (4), makes a U-turn there, and further circulates in a serpentine manner around the upper intermediate passage group (B), the lower intermediate passage group (C), and the outlet side passage group (D) to form a refrigerant outlet pipe. (10) flows out of the vessel. Then, while the refrigerant flows through each tube (1), it exchanges heat with the air passing through the air circulation gap that includes the corrugated fins (2), and the refrigerant gradually liquefies to reduce the volume and each passage group. To distribute. Therefore,
In this embodiment, since the passage cross-sectional area of each passage group gradually decreases from the inlet side passage group (A) toward the outlet side passage group (D), it is efficient in response to the volume change of the refrigerant. Heat can be exchanged, and the overall heat exchange efficiency can be improved in combination with the improvement of the efficiency of flow distribution from the refrigerant inflow chamber (31) to the tube (1).

In the above embodiment, the refrigerant inflow chamber (31) is divided into two inflow partition chambers (31a) (31a), and the branch pipe (9a) of the refrigerant inlet pipe (9) is also divided into these. The number of tubes (1) to be divided by one branch pipe (9a) depends on the capacity of the refrigerant inlet pipe (9), the cross-sectional area of the branch pipe (9a), and the tube (1). Cross-sectional area,
Since it depends on the volume of the inflow partition chamber (31a), etc., it is sufficient to set the number of tubes with the best flow distribution efficiency for the branch pipe and determine the number of inflow partition chambers and branch pipes in the header accordingly. The provision of three or more partition chambers and branch pipes is not excluded.

[0014]

As described above, according to the present invention, the tubular hollow header, the refrigerant inlet pipe communicating with the refrigerant inflow chamber of the header, and the plurality of tubes communicating with the refrigerant inflow chamber are provided. In the heat exchanger provided, the refrigerant inflow chamber is partitioned into two or more inflow partition chambers in the length direction of the header, and a corresponding number of branch pipes are formed in the refrigerant inlet pipe, and each branch pipe is provided with each inflow partition. Since it is characterized in that it is connected to the chamber, the number of tubes for which one branch pipe is responsible for diversion is reduced compared to the case where one refrigerant inlet pipe is connected to one refrigerant inflow partition chamber. Can be made. As a result, a large amount of refrigerant can be evenly distributed to each tube that is connected to the refrigerant inflow chamber, and the heat exchange performance of the tube can be sufficiently exerted, and sufficient for subsequent tubes. A large amount of refrigerant can be circulated, and the performance of the heat exchanger can be maximized to improve the efficiency of the entire heat exchanger.

[Brief description of drawings]

FIG. 1A is a front view of a heat exchanger according to an embodiment of the present invention, and FIG. 1B is a plan view of the same.

FIG. 2 is an enlarged front sectional view showing the vicinity of a branch pipe connection portion of a refrigerant inlet pipe.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a schematic refrigerant circuit diagram of the heat exchanger of FIG. 1.

FIG. 5 is an enlarged front cross-sectional view showing the periphery of a connection portion of a refrigerant inlet pipe of a conventional heat exchanger.

[Explanation of symbols]

 1 ... Tubes 3, 4 ... Header 31 ... Refrigerant inflow chamber 31a ... Inflow partitioning chamber 9 ... Refrigerant inlet pipe 9a ... Branch pipe

Claims (1)

[Claims] 1. A cylindrical hollow header (3) and a refrigerant inlet pipe (9) connected to the refrigerant inflow chamber (31) of the header for communication.
And a plurality of tubes (1) connected in communication with the refrigerant inflow chamber (31), wherein the refrigerant inflow chamber (31) has two or more inflow partition chambers in the length direction of the header. (31a) and (31a),
A heat exchanger characterized in that a corresponding number of branch pipes (9a) (9a) are formed in the refrigerant inlet pipe (9), and each branch pipe (9a) is connected to each inflow partition chamber (31a).