JPH0682123A - Heat exchanger - Google Patents

Abstract

PURPOSE:To suppress pressure pulsation of a refrigerant flowing through a pipe as the cause of generating abnormal sounds by solving a problem of the abnormal sounds which are generated at the start of operation and when the frequency of a compressor changes in a heat exchanger used for an air- conditioning apparatus. CONSTITUTION:This apparatus is made up of fins arranged in plurality, a heat exchanger tube 25 arranged zigzag with a U-shaped pipe 26 inserted and joined into the fins 22, an inlet tube 27 and an outlet tube 28 connected at both ends of the heat exchanger tube 25 and a connection tube 29 which is positioned parallel with the heat exchanger tube 25, behind the fins 22 and above the inlet pipe 27 with one end thereof connected to the inlet tube 27 while the other end is sealed up. This enables the suppressing of a pressure pulsation of the refrigerant.

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 in a refrigeration cycle device such as an air conditioner.

[0002]

2. Description of the Related Art Generally, a refrigeration cycle of an air conditioner is composed of a compressor, a four-way valve, an outdoor heat exchanger, an expansion valve and an indoor heat exchanger. ing.

The conventional indoor heat exchanger will be described below. FIG. 4 shows a conventional indoor heat exchanger disclosed in Japanese Patent Laid-Open No. 4-48191. In FIG. 4, 1 is a heat exchanger, 2 is a plurality of fins arranged, and end plates 3 at both ends,
4 are provided. Reference numeral 5 denotes a heat transfer tube which is inserted and joined to the fin 2 and is piped in a meandering shape by a U-shaped tube 6, and an inlet pipe 7 and an outlet pipe 8 are attached to both ends thereof. Further, a side branch cavity portion 10 is formed by providing a closed portion 9 inside a part of the heat transfer tube 5.

The operation of the indoor heat exchanger configured as described above will be described. When the air conditioner is operated, the refrigerant discharged from the compressor (not shown) flows into the heat exchanger 1 and exchanges heat with the outer surface of the heat transfer tube 5 and the airflow flowing through the fins 2. However, when the circulating amount of the refrigerant suddenly changes at the start of the operation or when the operating frequency of the compressor changes, pressure pulsation occurs in the refrigerant flow, and the pressure pulsation may cause an abnormal noise to give an uncomfortable feeling. Therefore, the heat exchanger shown in FIG. 4 has the side branch cavity portion 10 inside the heat exchanger 1.
By providing the pulsation of the refrigerant, the generation of abnormal noise is reduced.

[0005]

However, in the above-mentioned configuration, since the refrigerant does not flow into the side branch cavity portion 10 and does not contribute to heat exchange, there is a problem that the heat exchange capacity of the heat exchanger 1 decreases. Was.

The present invention solves the above-mentioned conventional problems and provides a heat exchanger that reduces pressure pulsation of the refrigerant without lowering the heat exchange capacity of the heat exchanger.

[0007]

In order to achieve this object, a heat exchanger according to the present invention comprises a plurality of fins, a heat transfer tube inserted in the fins and joined in a meandering shape by a U-shaped tube. It is composed of an inlet pipe and an outlet pipe connected to both ends of the heat transfer pipe, and a connecting pipe connected to the inlet pipe substantially vertically upward and having the other end sealed.

The heat exchanger of the present invention includes a plurality of arranged fins, a heat transfer tube inserted in the fins and connected in a meandering shape by a U-shaped tube, and an inlet tube connected to both ends of the heat transfer tube. And an outlet pipe, and a pipe which is parallel to the heat transfer pipe and is located behind the fin and above the inlet pipe and has one end connected to the inlet pipe and the other end sealed.

The heat exchanger of the present invention includes a plurality of arranged fins, a heat transfer tube inserted and joined to the fins in a meandering shape by a U-shaped tube, and an inlet tube connected to both ends of the heat transfer tube. And an outlet pipe, and a connecting pipe connected to the lower part of the inlet pipe and having an ultrafine pipe connected to the other end, and the other end of the ultrafine pipe is connected to the outlet pipe.

[0010]

With this structure, the pressure pulsation of the refrigerant inside the heat exchanger formed by the side branch cavity is suppressed, and the refrigerant can be flowed through all the heat transfer tubes that are inserted and joined to the fins and contribute to heat exchange.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 11 is a heat exchanger, 12 is a plurality of fins arranged, and end plates 13 and 14 are provided at both ends. 15 is inserted and joined to the fin 12 and is a U-shaped tube 16
Is a heat transfer tube that is piped in a meandering shape, with an inlet tube 1 at both ends.
7. The outlet pipe 18 is attached. Also, a side branch cavity portion 20 is formed by connecting a connection pipe 19 whose other end is sealed toward the inlet pipe in a substantially vertical upward direction.

The operation of the heat exchanger configured as described above will be described. When the circulation amount of the refrigerant suddenly changes at the start of operation or when the operating frequency of the compressor changes, pressure pulsation occurs in the refrigerant flow. However, in the heat exchanger 11, the side branch cavity portion 20 connected to the inlet pipe 17 is provided. The pulsation of the refrigerant is suppressed and the generation of abnormal noise is reduced. Further, since the side branch cavity portion 20 is connected above the inlet pipe 17, refrigerating machine oil does not stay, and reliability is not deteriorated due to lack of refrigerating machine oil in the compressor. further,
Heat transfer tube 15 that is inserted and joined to the fins 12 and contributes to heat exchange
Since the refrigerant flows through all, the ability of the heat exchanger 11 can be fully exerted.

As described above, according to this embodiment, a plurality of fins 12 are arranged, the heat transfer tubes 15 inserted into the fins 12 and joined in a serpentine manner by the U-shaped tube 16, and the heat transfer tube 1
5, an inlet pipe 17 and an outlet pipe 18 connected to both ends of 5,
By configuring with the connection pipe 19 which is connected to the inlet pipe 17 substantially vertically upward and the other end of which is sealed, the pulsation of the refrigerant can be suppressed, abnormal noise can be reduced, and no discomfort can be given. Since the refrigerant flows through all the heat transfer tubes 15 that are inserted and joined to 12 and contribute to heat exchange, the capability of the heat exchanger 11 can be fully exerted.

Another embodiment of the present invention will be described below with reference to the drawings. In FIG. 2, 21 is a heat exchanger, 22 is a plurality of arranged fins, and end plates 2 are provided at both ends.
3 and 24 are provided. Reference numeral 25 is a heat transfer tube that is inserted and joined to the fin 22 and is piped in a meandering manner by a U-shaped tube 26. An inlet tube 27 and an outlet tube 28 are attached to both ends. Also,
A connection pipe 29 having one end connected to the inlet pipe 27 and the other end sealed is provided parallel to the heat transfer pipe 25, behind the fins, and above the inlet pipe 27. The connection pipe 29 is fixed by the end plates 23 and 24. ing. The connection pipe 29 forms a side branch cavity 30.

The operation of the heat exchanger configured as described above will be described. When the circulation amount of the refrigerant suddenly changes at the start of operation or when the operating frequency of the compressor changes, pressure pulsation occurs in the refrigerant flow. However, in the heat exchanger 21, the side branch cavity portion 30 connected to the inlet pipe 27 is provided. The pulsation of the refrigerant is suppressed and the generation of abnormal noise is reduced. Further, since the side branch cavity portion 30 is connected above the inlet pipe 27, refrigerating machine oil does not stay, and reliability is not deteriorated due to lack of refrigerating machine oil in the compressor. further,
Heat transfer tube 25 that is inserted and joined to the fins 22 and contributes to heat exchange
Since the refrigerant flows through all, the ability of the heat exchanger 21 can be fully exerted. Further, in the present embodiment, since the connecting pipe 29 corresponding to the side branch cavity portion 30 is located behind the fins 22, that is, in the air passage, the installation space for the heat exchanger 21 can be made relatively small.

As described above, according to this embodiment, a plurality of fins 22 are arranged, the heat transfer tubes 25 inserted into the fins 22 and joined in a serpentine manner by the U-shaped tube 26, and the heat transfer tube 2
An inlet pipe 27 and an outlet pipe 28 connected to both ends of 5,
By forming the connection pipe 29 which is parallel to the heat transfer pipe 25, behind the fins and above the inlet pipe 27 and has one end connected to the inlet pipe 27 and the other end sealed, the pulsation of the refrigerant is suppressed and abnormal noise is generated. Can be reduced without causing discomfort, and since the refrigerant flows through all the heat transfer tubes 25 that are inserted and joined to the fins 22 and contribute to heat exchange, the ability of the heat exchanger 22 can be fully exhibited. Further, it is possible to suppress an increase in the installation space of the heat exchanger 22 due to the side branch cavity portion 30.

Another embodiment of the present invention will be described below with reference to the drawings. In FIG. 3, 31 is a heat exchanger, 32 is a plurality of arranged fins, and end plates 3 are provided at both ends.
3, 34 are provided. Reference numeral 35 is a heat transfer tube that is inserted and joined to the fin 32 and is piped in a meandering shape by a U-shaped tube 36. An inlet tube 37 and an outlet tube 38 are attached to both ends. Also,
The inlet pipe 37 is provided with a connecting pipe 39, the other end of the connecting pipe 39 is connected to the ultrafine pipe 41, and the other end of the ultrafine pipe 41 is connected to the outlet pipe 38. The connecting pipe 39 forms a side branch cavity 40.

The operation of the heat exchanger configured as above will be described. Pressure pulsation occurs in the refrigerant flow when the circulation amount of the refrigerant suddenly changes at the start of operation or when the operating frequency of the compressor changes, but in the heat exchanger 31, the side branch cavity portion 40 connected to the inlet pipe 37 is provided. The pulsation of the refrigerant is suppressed and the generation of abnormal noise is reduced. Further, since the refrigerant flows through all the heat transfer tubes 35 that are inserted and joined to the fins 32 and contribute to heat exchange, the capacity of the heat exchanger 31 can be fully exhibited. Further, in this embodiment, since the connecting pipe 39 corresponding to the side branch cavity 40 is located on the side of the U-shaped pipe 36, a special space for installing the side branch cavity 40 can be relatively suppressed.
Further, since the side branch cavity portion 40 is located below the inlet pipe 37, the refrigerating machine oil flowing simultaneously in the refrigerant stays, but by providing the ultrafine pipe 41 at the other end, the refrigerating machine oil is discharged to the outlet pipe 38, There is no reduction in reliability due to lack of refrigerating machine oil in the compressor. Here, the flow of the refrigerant to the heat transfer tube 35 is larger than the flow resistance in the heat transfer tube because the extra-fine tube 41 is attached, and is not disturbed.

As described above, according to this embodiment, a plurality of fins 32 are arranged, the heat transfer tubes 35 inserted and joined to the fins 32 and arranged in a meandering shape by the U-shaped tube 36, and the heat transfer tube 3
An inlet pipe 37 and an outlet pipe 38 connected to both ends of 5,
The connecting pipe 39 is connected to the lower portion of the inlet pipe 37 and the ultrafine pipe 41 is connected to the other end thereof, and the other end of the ultrafine pipe 41 is connected to the outlet pipe 38 to prevent the pulsation of the refrigerant. The generation of abnormal noise can be suppressed and no discomfort is given, and the refrigerant flows through all the heat transfer tubes 35 that are inserted and joined to the fins 32 and contribute to heat exchange. Therefore, the heat exchanger 3
It is possible to fully exhibit the capability of No. 1 and to suppress an increase in the installation space of the heat exchanger 31 due to the side branch cavity portion 40.

[0021]

As described above, according to the present invention, a plurality of arranged fins, a heat transfer tube inserted in the fins and connected in a meandering shape by a U-shaped tube, an inlet tube connected to both ends of the heat transfer tube, and By comprising an outlet pipe and a pipe connected to the inlet pipe substantially vertically upward and having the other end sealed, it is possible to suppress pulsation of the refrigerant and reduce the occurrence of abnormal noise without causing discomfort, and Since the refrigerant flows through all the heat transfer tubes that are inserted and joined to the fins and contribute to heat exchange, the capacity of the heat exchanger can be fully exhibited.

Further, the present invention comprises a plurality of fins arranged in an array,
A heat transfer tube which is inserted and joined to the fin and is arranged in a meandering shape by a U-shaped tube, an inlet tube and an outlet tube connected to both ends of the heat transfer tube, a position parallel to the heat transfer tube and behind the fin and above the inlet tube. By constructing a pipe with one end connected to the inlet pipe and the other end sealed, the pulsation of the refrigerant can be suppressed and the occurrence of abnormal noise can be reduced without giving discomfort, and
Since the refrigerant flows through all the heat transfer tubes that are inserted and joined to the fins and contribute to heat exchange, the capacity of the heat exchanger can be fully exerted and the expansion space of the heat exchanger due to the side branch cavity is suppressed. be able to.

Further, the present invention comprises a plurality of fins arranged,
A heat transfer tube inserted into a fin and joined in a serpentine manner by a U-shaped tube, an inlet tube and an outlet tube connected to both ends of the heat transfer tube, and a connection in which the inlet tube is connected below and an ultrafine tube is connected to the other end. It is composed of a pipe, and by connecting the other end of the ultrafine pipe to the outlet pipe, the pulsation of the refrigerant can be suppressed and the generation of abnormal noise can be reduced without giving discomfort, and
Since the refrigerant flows through all the heat transfer tubes that are inserted and joined to the fins and contribute to heat exchange, the capacity of the heat exchanger can be fully exerted and the expansion space of the heat exchanger due to the side branch cavity is suppressed. be able to.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of a main part of a heat exchanger according to a first embodiment of the present invention, and FIG. 1B is a side view of a heat exchanger according to a first embodiment of the present invention.

FIG. 2A is a cross-sectional view of a main part of a heat exchanger according to a second embodiment of the present invention, and FIG. 2B is a side view of the heat exchanger according to the second embodiment of the present invention.

FIG. 3A is a cross-sectional view of a main part of a heat exchanger according to a third embodiment of the present invention, and FIG. 3B is a side view of the heat exchanger according to the third embodiment of the present invention.

FIG. 4A is a cross-sectional view of a main part of a conventional heat exchanger, and FIG. 4B is a side view of the conventional heat exchanger.

[Explanation of symbols]

 11, 21, 31 Heat exchanger 12, 22, 32 Fins 15, 25, 35 Heat transfer pipe 16, 26, 36 U-shaped pipe 17, 27, 37 Inlet pipe 18, 28, 38 Outlet pipe 19, 29, 39 Connection pipe 41 Ultrafine tube

Claims (3)

[Claims] 1. A plurality of arranged fins, and a heat transfer tube inserted into and joined to the fins and arranged in a meandering shape by a U-shaped tube,
A heat exchanger comprising an inlet pipe and an outlet pipe connected to both ends of a heat transfer pipe, and a connecting pipe connected to the inlet pipe substantially vertically upward and having the other end sealed. 2. A plurality of arranged fins, and a heat transfer tube inserted in the fins and joined in a meandering shape by a U-shaped tube,
It comprises an inlet pipe and an outlet pipe connected to both ends of the heat transfer pipe, and a connecting pipe which is parallel to the heat transfer pipe and is located behind the fin and above the inlet pipe and has one end connected to the inlet pipe and the other end sealed. Heat exchanger. 3. A plurality of arranged fins, and a heat transfer tube inserted and joined to the fins and arranged in a meandering shape by a U-shaped tube,
An inlet pipe and an outlet pipe connected to both ends of the heat transfer pipe, and a connecting pipe connected to the inlet pipe and an ultrafine pipe connected to the other end, and the other end of the ultrafine pipe is connected to the outlet pipe. A heat exchanger characterized by.