JP2557497Y2 - Heat exchanger shunt - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shunt of an air conditioner heat exchanger used as an evaporator.

[0002]

2. Description of the Related Art Heat exchangers for air conditioning are required to be compact and have high performance. Therefore, there is an increasing tendency to use thinner and more tubes used for the heat exchanger core. When a large number of thin tubes are used, the refrigerant is simultaneously supplied to a plurality of tubes from a refrigerant inlet pipe via a flow divider. In general, the current divider used was one that had been subjected to cutting after casting. The flow divider composed of such a cast component has a drawback that the number of manufacturing steps is large and the cost is high. Furthermore, the cast distributor has to be thicker than the inlet and outlet pipes connected to it, resulting in a large difference in heat capacity at the time of brazing the pipe, and has a disadvantage that brazing failure is liable to occur. Was.
Therefore, it is conceivable to manufacture this flow divider by plastically deforming the pipe material. However, in this case, there is a disadvantage that the flow of the refrigerant is hardly uniformly distributed in each flow path.

[0003]

Accordingly, the present invention employs the following structure to solve the above-mentioned problems. The flow divider of the heat exchanger of the present invention is arranged at the branch of a tube through which a refrigerant that changes phase into gas and liquid flows, and one pipe material is plastically deformed and one end is provided at one end thereof. An inlet pipe 1 having a circular cross section is provided. A flat tube portion 2 is integrally connected to the inlet tube portion 1, and a plurality of circular tube portions 3, 3, each having a cross-sectional shape formed in a spectacle shape, are formed at the tip of the flat tube portion 2. Are arranged in parallel in the long axis direction. Then, on the extension of the boundary between the circular pipes 3, 3, a guide 4 having a spectacle-shaped constriction is formed partially in the flat pipe 2, and between the guide 4 and the circular pipe 3. A communication portion 5 branched from the guide portion is formed, and the communication portion 5 allows the refrigerant to communicate with each other.

[0004]

According to the flow divider of the present invention, the refrigerant flowing from the inlet pipe 1 is rectified by the respective guides 4 and guided to the respective circular pipes 3, 3 as shown in FIG. In addition, the presence of the communication portion 5 formed between the circular tube portion 3 and the guide portion 4 makes the pressure of the refrigerant 12 guided to the plurality of circular tube portions 3 and 3 uniform with each other. The refrigerant circulating in the air is distributed uniformly. Then, as shown in FIG. 3, the refrigerant is led to the outlet pipes 8 connected to the respective circular pipe sections 3, and
The cooling capacity of each part of the heat exchanger 6 is uniformly maintained.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view showing a use state of the current splitter of the present invention, FIG. 2 is a schematic perspective view of the current splitter, FIG. 3 is an explanatory view showing a connection state between the current splitter and a heat exchanger core, and FIG. FIG. 4 is a schematic perspective view of a flow divider according to a second embodiment of the present invention. The flow divider of the first embodiment is manufactured by plastically processing a single circular pipe as shown in FIGS. That is, the inlet pipe part 1 having a circular cross section is formed at one end thereof, and the intermediate part and the other end are formed flat and intermittently pressed from both sides of the flat part to form eyeglasses in cross section. Then, a pair of circular pipes 3 and 3 are formed at the other end of the flow divider 13. Such a shunt
In 13, the inner surfaces of the flat tube portion 2 facing each other on the axis except the inlet tube portion 1 are intermittently crimped by the guide portion 4, and the pair of circular tube portions 3 and 3 are similarly crimped.
And this circular pipe | tube part 3 is formed in cross section equally.

[0006] The inlet pipe 1 of the flow divider 13 thus constructed.
The inlet pipe 9 is fitted into the fitting, and the fitted portion is fixed by brazing or soldering. The ends of the outlet pipes 8 are fitted into the pair of circular pipes 3, respectively, and the fitted portions are fixed by brazing or soldering. The other end of each outlet pipe 8 is liquid-tightly joined to the end of the tube 7 of the heat exchanger core 6 as shown in FIG. This tube 7 has many fins
Fourteen tube insertion holes are inserted, and the insertion part is thermally joined. The tube 7 serves as a flow path for a refrigerant in a gas-liquid two-phase state. Generally, ends of a large number of tubes 7 are joined by a U-bend tube (not shown), and the refrigerant flows in a meandering manner. . Then, it cools the airflow flowing through the outer surface of the tube 7 and the outer surface of the fin 14.

FIG. 4 shows a second embodiment of the present invention. In this embodiment, three circular tubes 3 are formed at one end of the flow divider 13. The guides 4 are provided intermittently on the extension of the boundary between the respective circular pipes 3. A communication portion 5 is formed between the guide portion 4 and a boundary between the circular tube portions 3.
In each embodiment, the length of the guiding portion 4 and the length of the communicating portion 5 are appropriately selected. The guide section 4 is designed to have a rectifying effect for guiding the refrigerant to each of the circular pipe sections 3, and the communication section 5 is designed to make the refrigerant pressure in each branch channel uniform. It is preferable to select the same material as the inlet pipe 9 and the outlet pipe 8 or a material similar thereto as the material of the flow divider 13. As the inlet pipe 9 and the outlet pipe 8, a copper pipe, an aluminum pipe, or a brass pipe is adopted.

[0008]

The flow divider according to the present invention is constructed as described above, so that the refrigerant flowing from the inlet pipes is guided by the guides 4 toward the respective circular pipes, and is rectified and guided smoothly. Due to the existence of the communicating portion existing between the guide portion and the circular tube portion, the pressure of the refrigerant guided to each portion becomes uniform, and the refrigerant can be uniformly diverted. The efficiency of the exchanger can be improved. That is, the heat transfer in each part of the heat exchanger can be made uniform, and the heat exchange performance can be improved. In addition, since the flow distributor is formed by plastically processing a single pipe material, the brazing performance with the inlet / outlet pipe connected to the flow distributor is improved. This is because the difference in heat capacity between the flow divider and the pipe is smaller than that of a conventional machined product, so that brazing failure based on the difference in heat capacity is eliminated. In addition, processing is easy, which can contribute to weight reduction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a use state of a flow divider according to a first embodiment of the present invention.

FIG. 2 is a schematic perspective view of the flow divider of the first embodiment.

FIG. 3 is a partial longitudinal sectional explanatory view showing a use state of the flow divider of the first embodiment.

FIG. 4 is a schematic perspective view of a flow divider according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a conventional flow divider.

FIG. 6 is a side view of a conventional flow divider.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inlet pipe part 2 Flat pipe part 3 Circular pipe part 4 Guide part 5 Communication part 6 Heat exchanger core 7 Tube 8 Outlet pipe 9 Inlet pipe 11 Side member 12 Refrigerant 13 Divider 14 Fin

Claims (1)

(57) [Scope of request for utility model registration] In a flow divider of a heat exchanger disposed at a branch of a tube through which a refrigerant that changes phase into a gas and a liquid flows, one pipe member is plastically processed, and one pipe member is provided at one end thereof. An inlet tube (1) having a circular cross section is provided, a flat tube (2) is integrally connected to the inlet tube (1), and the cross section of the flat tube (2) has a spectacle shape at the tip. A plurality of deformed circular pipe sections (3) and (3) are arranged in parallel in the longitudinal direction of the cross section of the flat pipe section (2), and the flat pipe section extends along a boundary between the circular pipe sections (3) and (3). A guiding portion (4) having a spectacle-shaped constriction is formed partially in the portion (2), and is branched by the guiding portion between the guiding portion (4) and the circular tube portion (3). A flow divider for a heat exchanger, wherein a communication part (5) is formed in which the respective refrigerants guided by the flow are communicated with each other.