JP4338591B2 - Heat exchanger distributor - Google Patents

Description

  The present invention relates to a heat exchanger distributor for collecting or distributing a plurality of fluids such as refrigerants.

  2. Description of the Related Art Conventionally, in heat pump hot water heaters, air conditioners, floor heating, etc., heat exchangers having a plurality of flow paths through which refrigerants such as carbon dioxide and chlorofluorocarbon and water flow are used.

As shown in FIG. 6, this type of heat exchanger is provided with a distributor 4 for collecting or distributing the fluid flowing through the pipes 1, 2, 3. 3 is connected to the distributor 4 by brazing (see, for example, Patent Document 1).
Japanese Utility Model Publication No. 52-6851

  However, in the conventional heat exchanger distributor described above, there is a problem that the brazing material flows into the distributor when each pipe is connected, blocks the flow path in the pipe, and the heat exchanger cannot perform sufficiently. there were.

  Furthermore, in heat exchangers that use carbon dioxide as a refrigerant, the pressure of the refrigerant is high and the heat capacity per unit volume is large, so the amount of carbon dioxide discharged from the compressor can be reduced, and pressure resistance must be ensured. There is also. Therefore, the flow path of the refrigerant pipe in this type of heat exchanger is formed with a smaller diameter than a heat exchanger using chlorofluorocarbon as a refrigerant, and this problem is more serious.

  The present invention has been made to solve the above problems, and aims to provide a distributor of a heat exchanger that can prevent the blockage of the flow path by the brazing material and can improve the reliability of the heat exchanger. Is.

The present invention is a distributor 26 of a heat exchanger 11 in which a plurality of pipes 20, 24, 25 are connected by brazing, and a fluid mixing unit capable of collecting or distributing fluid flowing through the pipes 20, 24, 25. 27 and a brazing material retaining portion 28 in which the brazing material can be retained. The brazing material retaining portion 28 is formed in a deep groove, and its opening end can be closed by a detachable lid member 29. 20, 24, and 25 are configured to be connected to the fluid mixing unit 27 through the brazing material retention unit 28.

  Preferably, the fluid piping 20 that collects in the fluid mixing unit 27 and the fluid pipings 24 and 25 distributed from the fluid mixing unit 27 are both connected to the fluid mixing unit 27 from the same direction. It is good to be configured as follows.

  In addition, the fluid piping 20 that collects in the fluid mixing unit 27 and the fluid pipings 24 and 25 distributed from the fluid mixing unit 27 are connected to the fluid mixing unit 27 from opposite directions. It may be.

  According to the present invention, since the pipe is configured to be connected to the fluid mixing part through the brazing material retention part, even when the brazing material flows into the distributor side when connecting the pipe to the distributor, The brazing material stays in the brazing material staying portion and does not flow into the pipe. Therefore, the interior of the pipe or distributor is not blocked by the brazing material, and the reliability of the heat exchanger can be improved.

  In addition, by providing the brazing material retaining portion, it is possible to increase the allowable amount of brazing material when connecting the pipe to the distributor, so that it is possible to prevent the occurrence of brazing defects due to insufficient brazing material, etc. Various excellent effects can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Here, FIG. 1 is a front view showing the heat exchanger in the present embodiment, FIG. 2 is a cross-sectional view showing the heat exchanger, FIG. 3 is a plan view showing a distributor of the heat exchanger, and FIG. FIG. 5 is a plan view showing another example of the distributor of the heat exchanger. In the following description, a double-pipe heat exchanger that performs heat exchange between a refrigerant such as carbon dioxide or chlorofluorocarbon and water in a heat pump water heater or the like will be described as an example.

  As shown in FIG. 1, the heat exchanger 11 has a configuration in which three heat exchange units 12, 13, and 14 are stacked in stages, and each heat exchange unit 12, 13, 14, 14 includes a double tube 15.

  As shown in FIG. 2, the double pipe 15 is provided with two copper inner pipes 16 arranged side by side and a copper outer pipe 17 provided outside the inner pipe 16. A refrigerant flow path 18 is formed in the inner pipe 16, and a water flow path 19 is formed between the inner pipe 16 and the outer pipe 17. The inner pipe 16 is composed of a copper refrigerant pipe 20 and a copper leak detection pipe 21 provided on the outer periphery of the refrigerant pipe 20, and a large number of pipes are formed on the inner surface of the leak detection pipe 21 along the pipe direction. A leakage detection groove 22 is formed. And the refrigerant | coolant or water which leaked from the inner tube | pipe 16 or the outer tube | pipe 17 leaks outside via the leak detection groove | channel 22 without mixing, and is detected by a leak detection sensor (not shown).

  Further, the outer pipes 19 are headers between the lowermost heat exchange unit 12 and the intermediate heat exchange unit 13 and between the intermediate heat exchange unit 13 and the uppermost heat exchange unit 14. 23, and the refrigerant pipes 20 between the respective stages, and the refrigerant pipe 20 and the refrigerant inlet pipe 24 or the refrigerant outlet pipe 25 are respectively connected via a block-like distributor 26.

  As shown in FIGS. 3 and 4, the distributor header 26 has two deep grooves formed in parallel as the fluid mixing portion 27 and the brazing material retaining portion 28. The open end of the material retaining portion 28 can be closed by a detachable lid member 29. The fluid mixing section 27 and the brazing material staying section 28 communicate with each other through a communication hole 30, and a plurality of communication holes 30 (in the drawing, corresponding to the refrigerant pipe 20 and the refrigerant inlet pipe 24 or the refrigerant outlet pipe 25). 6) Drilled. The refrigerant pipe 20, the refrigerant inlet pipe 24, and the refrigerant outlet pipe 25 are brazed to the distributor header 26 and connected to the fluid mixing section 27 through the brazing material staying section 28.

  For this reason, even when the brazing material flows into the distributor 26 when the refrigerant pipe 20, the refrigerant inlet pipe 24, and the refrigerant outlet pipe 25 are joined to the distributor 26, the brazing material stays in the brazing material retaining portion 28. There is no possibility that the refrigerant pipe 20, the refrigerant inlet pipe 24, the refrigerant outlet pipe 25, the fluid mixing unit 27, and the communication pipe 29 will flow into the refrigerant pipe 20. Therefore, even if the inner diameter of the pipe such as the refrigerant pipe 20 is thin, for example, 5 mm or less, the pipe and the inside of the distributor 26 are not blocked by the flow of the brazing material, and the reliability of the heat exchanger 11 is improved. Can be improved.

  Further, since the brazing material staying portion 28 is provided, the allowable amount of brazing material used when connecting the refrigerant pipe 20, the refrigerant inlet pipe 24 and the refrigerant outlet pipe 25 to the distributor 26 can be increased. It is possible to prevent the occurrence of a brazing defect due to.

  In the above-described embodiment, the refrigerant pipe 20 through which the refrigerant that collects in the fluid mixing section 27 flows and the refrigerant inlet pipe 24 or the refrigerant outlet pipe 25 through which the refrigerant distributed from the fluid mixing section 27 flows are mixed. For example, as shown in FIG. 5, the refrigerant pipe 20 and the refrigerant inlet pipe 24 or the refrigerant outlet pipe 25 are opposite to the fluid mixing section 27. You may be comprised so that it may connect in a direction.

  In the above embodiment, the case of a double-pipe heat exchanger that exchanges heat between the refrigerant and water has been described. However, this is merely an example, and the present invention can be applied to heat between refrigerants, for example. Needless to say, the present invention can also be applied to a heat exchanger for exchanging heat between other fluids such as when exchanging.

It is a front view which shows the heat exchanger in embodiment of this invention. It is sectional drawing which shows the heat exchanger in embodiment of this invention. It is a top view which shows the distributor of the heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows the distributor of the heat exchanger which concerns on embodiment of this invention. It is a top view which shows another example of the distributor of the heat exchanger which concerns on embodiment of this invention. It is sectional drawing which shows a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Heat exchanger 20 Refrigerant pipe 24 Refrigerant inlet pipe 25 Refrigerant outlet pipe 26 Distributor 27 Fluid mixing part 28 Brazing material retention part

Claims (3)

A heat exchanger distributor in which a plurality of pipes are connected by brazing,
A fluid mixing section capable of collecting or distributing fluid flowing in the pipe;
A brazing material retaining portion in which the brazing material can be retained;
The brazing material retaining portion is formed in a deep groove, the open end of which can be closed by a detachable lid member, and the pipe is connected to the fluid mixing portion through the brazing material retaining portion. A heat exchanger distributor, characterized in that it is configured to 2. The fluid piping that gathers in the fluid mixing section and the fluid piping that is distributed from the fluid mixing section are both connected to the fluid mixing section from the same direction. Distributor of heat exchanger as described in. The fluid piping that gathers in the fluid mixing portion and the fluid piping that is distributed from the fluid mixing portion are connected to the fluid mixing portion from opposite directions, respectively. Distributor of the described heat exchanger.

Images