JPH0628559U - Heat exchanger - Google Patents

Abstract

(57) [Summary] [Object] To provide a heat exchanger capable of smoothly maintaining a gas-liquid mixed state of a refrigerant and ensuring excellent heat exchange efficiency. [Structure] A bent portion 6a that is bent is provided in the vicinity of a connection port on the side where the refrigerant introduction pipe 6 is connected to an evaporator. The bent portion 6a disturbs the flow of the refrigerant flowing inside and maintains the gas-liquid mixed state. That is, in this heat exchanger, the atomized refrigerant that has passed through the expansion valve and is guided to the refrigerant introduction pipe 6 is separated into gas and liquid while flowing through the refrigerant introduction pipe 6, and becomes a two-layer flow. Is blocked at the bent portion 6a. Thereby, hunting of the evaporation pressure is prevented, and the heat exchange rate of the heat exchanger is significantly improved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a heat exchanger used for an air conditioner such as an automobile.

[0002]

[Prior art]

 Conventionally, in air conditioners for automobiles, generally, a compressor, a condenser, an expansion valve, an evaporator, and the like are sequentially connected by piping to form a refrigerant circuit, and the refrigerant is circulated in the refrigerant circuit. Air conditioning is done.

A heat exchanger such as a condenser or an evaporator that constitutes an air conditioner of this type has a plurality of refrigerant passages for a round pipe-shaped header pipe (distributor) that is usually connected to a pipe of a refrigerant circuit. A flat tube (multi-flow tube) formed in parallel is inserted, and both ends are joined by gluing. The flat tubes are arranged in a meandering manner, and a large number of fins for heat radiation are provided between the meandering flat tubes. Further, a refrigerant introducing pipe is connected to one header pipe, and a refrigerant outlet pipe is connected to the other header pipe.

[0004]

[Problems to be solved by the device]

 In the case of the conventional heat exchanger, for example, a refrigerant introduction pipe for feeding the refrigerant to the evaporator (evaporator) extends linearly around the connection port of the evaporator. Here, the refrigerant in the refrigerant circuit usually has to be atomized after passing through the expansion valve, passing through the refrigerant introducing pipe, and being sent to the evaporator. However, in the conventional heat exchanger, the refrigerant is in a state close to a two-layer flow while passing through the refrigerant introduction pipe, and tends to be separated into gas and liquid just before entering the evaporator. As a result, there is a problem that the heat exchange efficiency is reduced.

The present invention has been made to solve the above problems, and a technical problem thereof is that the gas-liquid mixed state of the cooling medium can be smoothly maintained and excellent heat exchange efficiency can be secured. The challenge is to provide.

[0006]

[Means for Solving the Problems]

 According to the present invention, in the heat exchanger to which the refrigerant introducing pipe for introducing the refrigerant is connected, the refrigerant introducing pipe disturbs the flow of the refrigerant flowing through the inside thereof to maintain the gas-liquid mixed state. A heat exchanger having a bent portion bent around the connection port is obtained.

Further, according to the present invention, in the heat exchanger, the bent portion is bent downward along the side surface of the heat exchanger body, and thus the heat exchanger can be obtained.

[0008]

[Action]

 The present invention solves the problem that the refrigerant is separated into gas and liquid just before entering the heat exchanger. Therefore, the shape of the refrigerant inlet pipe is bent around the connection port of the heat exchanger. It is composed of As a result, the flow of the refrigerant is disturbed at the bent portion of the refrigerant introduction pipe immediately before entering the heat exchanger and enters the heat exchanger in a gas-liquid mixed state, so that the heat exchange in the heat exchanger is smooth. The heat exchange rate is improved.

[0009]

【Example】

 Hereinafter, the heat exchanger of the present invention will be described in detail with reference to the accompanying drawings. 1 is a perspective view of a heat exchanger according to an embodiment of the present invention, and FIG. 2 is a side view of the heat exchanger shown in FIG. This heat exchanger constitutes the evaporator 1, and in FIG. 1, air flows into the evaporator 1 in the direction of arrow A.

The evaporator 1 includes a flat tube 2 that folds back and forth and meanders, and a radiating fin 3 provided between the parallel straight tube portions 2 a of the flat tube 2.

Of these, a plurality of fluid passages (not shown) through which a refrigerant such as CFC flows is provided in the flat tube 2, and one end of the flat tube 2 has a cylindrical header for introducing a fluid. 4 is connected, and a cylindrical header 5 for discharging fluid is connected to the other end side.

Further, the header 4 on the refrigerant introduction side is connected to one end side of the flat tube 2 on the side surface of the evaporator 1 main body, one end side thereof is connected to the refrigerant introduction tube 6 and the other end side thereof is closed. . As a result, the refrigerant is guided from the refrigerant introduction pipe 6 to the header 4 and then introduced into the flat pipe 2 in the orthogonal direction.

On the other hand, the refrigerant discharge side header 5 is similarly connected to the other end side of the flat tube 2 on the side surface of the evaporator 1 main body, one end side thereof is connected to the refrigerant discharge pipe 7 and the other end side is closed. Has been done. As a result, the refrigerant that has passed through the meandering flat tube 2 is guided to the refrigerant discharge tube 7 via the header 5.

Further, as shown in FIG. 2, the refrigerant introducing pipe 6 is formed in a substantially V shape on the side surface of the main body of the evaporator 1 in the periphery immediately before the inlet connected to the header 4 (that is, around the connection port of the evaporator 1). A bent portion 6a that is bent downward is formed. The bent portion 6a is provided to maintain a good gas-liquid mixed state of the refrigerant by disturbing the flow of the refrigerant flowing inside the refrigerant introduction pipe 6.

In the evaporator 1 having such a configuration, the atomized refrigerant introduced to the refrigerant introduction pipe 6 via the expansion valve (not shown) is introduced to the flat pipe 2 via the header 4 and Heat is exchanged during the passage. The refrigerant that has passed through the flat pipe 2 is discharged from the discharge pipe 7 through the header 5.

By the way, in the case of this evaporator 1, since the bent portion 6a is formed immediately before the refrigerant introduction pipe 6 is connected to the header 4, the atomized refrigerant flowing in the refrigerant introduction pipe 6 toward the header 4 is , Where the flow is disturbed and a good gas-liquid mixed state is achieved. As a result, hunting of the evaporation pressure of the refrigerant is prevented without causing one-sided flow in the flat tube 2, so that the heat exchange rate (here, the cooling efficiency) is increased.

FIG. 3 is a graph showing a variation characteristic of the vapor pressure [kg / cm ² G] of the refrigerant in the heat exchanger (evaporator 1) of the present invention. FIG. 4 shows a conventional heat exchanger as a comparative example. 3 is a graph showing the change characteristics of the vapor pressure [kg / cm ² G] of the refrigerant for the (evaporator). As a result of the experimental measurement, comparing the data of the fluctuation characteristics of the two shows that the fluctuation of the evaporation pressure in the heat exchanger of the present invention is suppressed much more than that of the conventional heat exchanger. This indicates that the heat exchange rate of the heat exchanger of the present invention is excellently improved.

In the embodiment, the V-shaped bent portion 6a is formed in the refrigerant introduction pipe 6, but other than this, the bent portion 6a may be deformed into various other shapes such as a U shape. However, the number is not limited to one. In addition, although the case where the evaporator 1 is configured as the heat exchanger is described in the embodiment, the formation of the bent portion according to the refrigerant introduction pipe of the present invention can be applied to the case where the condenser (condenser) is configured. You can Therefore, the present invention is not limited to the embodiment.

[0019]

[Effect of device]

 As described above, according to the heat exchanger of the present invention, the cooling medium introduction pipe connected to the heat exchanger main body is bent around the connection port, and the flow of the refrigerant flowing inside is formed as the bent portion. Since the mixture is disturbed to ensure a stable gas-liquid mixed state of the refrigerant, the vapor pressure hunting is prevented, and the heat exchange rate is significantly improved. Further, since the bent portion is bent downward along the side surface of the heat exchanger body, the outer shape of the heat exchanger body is substantially a rectangular parallelepiped, and therefore, for example, a part of an air conditioner for a vehicle. As a result, it can be easily placed without occupying space when it is stored in the body board.

[Brief description of drawings]

FIG. 1 is a perspective view showing a heat exchanger according to an embodiment of the present invention.

2 is a side view of the heat exchanger shown in FIG. 1 viewed from the arrow B side.

FIG. 3 is a graph showing the fluctuation characteristics of the vapor pressure of the refrigerant for the heat exchanger shown in FIG.

FIG. 4 is a graph showing a variation characteristic of a vapor pressure of a refrigerant regarding a conventional heat exchanger.

[Explanation of symbols]

 1 Evaporator 2 Flat Pipe 3 Radiating Fin 4 Header 6 Refrigerant Inlet Pipe 6a Bent 7 Refrigerant Discharge Pipe

Claims (2)

[Scope of utility model registration request] 1. A heat exchanger to which a refrigerant introduction pipe for introducing a refrigerant is connected, wherein the refrigerant introduction pipe disturbs the flow of the refrigerant flowing through the inside thereof to maintain a gas-liquid mixed state. A heat exchanger having a bent portion that is bent around a connection port of the container. 2. The heat exchanger according to claim 1, wherein the bent portion is bent downward along a side surface of the heat exchanger body.