JPH0545470U - Heat exchanger for air conditioner - Google Patents

Abstract

(57) [Summary] [Purpose] There is no risk of refrigerant leakage or pressure breakdown in the bent portion when the bending portion where the temperature sensor is welded is not welded and the bent portion is not perforated or extremely thinned. Heat exchanger for air conditioner without. [Structure] A tube group 6 including a plurality of tubes 3 penetrating the fins 4 and bent portions 2 connecting the tubes 3 to each other.
In the heat exchanger 1 for an air conditioner, which is provided with a temperature detector 8 that is welded to the pipe group 6 and detects the surface temperature of the pipe group 6, the meat of the bent portion 2 ′ to which the temperature detector 8 is welded The thickness is made larger than that of the other bent portions 2. With the above-described configuration, there is no risk that the bent portion 2 ′ will not be perforated or extremely thinned during the welding operation of the bent portion 2 ′ to which the temperature detecting body 8 is welded, and refrigerant leakage or pressure breakdown in the bent portion 2 ′ may occur. Disappears.
As a result, it is possible to reduce the defective rate of products due to variations in welding work.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a heat exchanger for an air conditioner, and more particularly, to a mounting portion of a temperature detecting body on the heat exchanger.

[0002]

[Prior Art]

 FIG. 1 is a perspective view showing the internal structure of an indoor unit in an example of a conventional air conditioner, FIG. 2 is a perspective view showing the surroundings of a temperature detecting body mounting portion, and FIG. 4 is an example of a detailed structure of a conventional temperature detecting body mounting portion. It is sectional drawing which shows. As shown in Fig. 1, the main parts of the indoor unit of the air conditioner are roughly, the heat exchanger 1 for exchanging heat with the indoor air by circulating a refrigerant therein, and the indoor air for the heat exchanger 1. It is composed of a convection fan 11 for sending, a convection motor 12 for rotationally driving the convection fan 11, and an electronic unit 13 for controlling the convection motor 12. The heat exchanger 1 is a temperature detector for detecting the surface temperature of a tube group consisting of the following tubes 3 and return bends 2 and 2'of the heat exchanger 1 in order to prevent freezing of the heat exchanger 1 during overcooling. 8 are provided. FIG. 2 is an appearance around a mounting portion of the temperature detecting body 8 of the general heat exchanger 1. The heat exchanger 1 is composed of fins 4 and tubes 3 penetrating the fins 4 and return bends 2 and 2'connecting the tubes 3 to each other. In the figure, a sensor holder 5 for holding a freezing thermistor 7, which is a temperature detecting body 8, is fixed to one (2 ') of a plurality of return bends 2 by brazing. Conventionally, as the return bend 2'to which the sensor holder 5 is brazed and fixed, as shown in FIG. 4, the one having the same wall thickness of 0.41 mm as the other return bend 2 to which the sensor holder 5 is not brazed is used. ing. The return bends 2 and 2'are made as thin as possible in terms of cost. For this reason, due to variations in brazing work in the process of brazing the sensor holder 5 to the return bend 2 ', perforation due to overheating of the return bend 2'and extreme thinning due to overheating melting are likely to occur. There was a flaw.

[0003]

[Problems to be solved by the device]

 As described above, the return bend of the conventional heat exchanger for the air conditioner uses the same thickness bend (the same bend) regardless of whether the sensor holder for the freeze thermistor is brazed or not. As a result, holes in the return bend and extreme thinning are likely to occur due to variations in brazing work, and there is a risk of refrigerant leakage and pressure breakdown at the vent. In order to solve the above problems in the conventional technology, the present invention has improved the mounting part of the temperature sensor, and has a hole for the return bend (bent part) and an extremely thin wall when brazing (welding) work. It is an object of the present invention to provide a heat exchanger for an air conditioner that does not occur, and does not cause refrigerant leakage or pressure breakdown.

[0004]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides a tube group including a plurality of straight pipe portions penetrating a heat sink and bent portions respectively connecting the straight pipe portions, and the pipe group welded to the pipe group. In a heat exchanger for an air conditioner equipped with a temperature detector for detecting the surface temperature of the, the wall thickness of the bent part to which the temperature sensor is welded is made larger than the wall thickness of other bends. Is configured as a heat exchanger for an air conditioner.

[0005]

[Action]

 According to the present invention, since the wall thickness of the bent portion to which the temperature sensing element is welded is made larger than the wall thickness of other bent portions, perforation and overheating due to overheating of the bent portion during welding work. It does not cause an extreme thinning due to, and there is no risk of refrigerant leakage or pressure breakage in the bent portion.

[0006]

【Example】

 Embodiments embodying the present invention will be described below with reference to the accompanying drawings to provide an understanding of the present invention. It should be noted that the following embodiments are examples of embodying the present invention, and are not of the nature to limit the technical scope of the present invention. Here, FIG. 1 is a perspective view showing an internal structure of an indoor unit of an air conditioner according to an embodiment of the present invention (shared with a conventional example), and FIG. 2 is a perspective view showing a portion around a temperature detecting body mounting portion, FIG. FIG. 4 is a cross-sectional view showing an example of a detailed structure of a temperature detecting body mounting portion. Further, the same symbols are used for the elements common to the cross-sectional view showing an example of the detailed structure of the conventional temperature sensor mounting portion shown in FIG. As shown in FIGS. 1 and 2, a temperature detector 8 is provided in the heat exchanger 1, which is one of the main components of the internal structure of the indoor unit of this air conditioner. The internal structure of the indoor unit and the appearance of the mounting portion of the temperature detecting body 8 are the same as those of the conventional example, and thus detailed description thereof will be omitted. As shown in FIG. 2, the heat exchanger 1 provided with the temperature detector 8 includes a tube group 6 composed of a plurality of tubes 3 penetrating the fins 4 and return bends 2 and 2'connecting the tubes 3 respectively. Is equipped with. Heat exchange is performed between the refrigerant flowing in the tube group 6 and the room air supplied to the fin 4 and the outer surface of the tube group 6. During this heat exchange, if the water in the air passing through the heat exchanger 1 becomes supercooled and freezes, it may adhere to the fins 4 and the pipe group 6 around and reduce the heat exchange rate. Since it is difficult to remove the frozen water once attached, it is necessary to prevent freeze development. Therefore, the surface temperature of the tube group 6 is monitored by the temperature detector 8 during the operation of the air conditioner, and when the temperature detector 8 detects a temperature equal to or lower than a predetermined temperature, a separate anti-freezing process is performed. The temperature detector 8 used for such a purpose is composed of a freezing thermistor 7 for detecting the surface temperature of the tube group 6 of the heat exchanger 1 and a sensor holder 5 for holding the freezing thermistor 7. Is attached to one return bend 2'of the heat exchanger 1 by brazing or the like welding. The conventional return bends 2 and 2'have the same wall thickness of 0.41 mm regardless of whether the sensor holder 5 is welded or not. In contrast, in this embodiment, the sensor holder 5 as shown in FIG. Only the return bend 2'which welds 5 has a thickness of 0.5 mm, and the other return bend 2 which does not weld the sensor holder 5 has a thickness of 0.41 mm in consideration of economy. There is. By increasing the thickness of the return bend 2 ', it is possible to prevent the return bend 2'from being overheated and being extremely thin when the sensor holder 5 is welded to the return bend 2'. it can. As a result, there is no risk of refrigerant leakage or pressure breakdown in the return bend 2 '. As a result, it is possible to reduce the defective rate of products due to variations in welding work in the welding process. It should be noted that in the above embodiment, the temperature detecting body 8 including the freezing thermistor 7 and the sensor holder 5 is used, but in actual use, the temperature detecting body 8 in which the freezing thermistor 7 and the sensor holder 5 are integrally molded is applied. However, there is no problem.

[0007]

[Effect of the device]

 Since the heat exchanger for an air conditioner according to the present invention is configured as described above, it is extremely thin due to perforation due to overheating and overheating during the welding operation of the bent portion where the temperature sensing element is welded. It does not occur, and there is no fear of causing refrigerant leakage or pressure breakdown at the bend. As a result, it is possible to reduce the defective rate of products due to variations in welding work.

[Brief description of drawings]

FIG. 1 is a perspective view showing an internal structure of an indoor unit of an air conditioner according to an embodiment of the present invention (shared with a conventional example).

FIG. 2 is a perspective view showing a portion around a temperature detecting body mounting portion (shared with a conventional example).

FIG. 3 is a cross-sectional view showing an example of a detailed structure of a temperature detector mounting portion.

FIG. 4 is a cross-sectional view showing an example of a detailed structure of a conventional temperature detector mounting portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Heat exchanger 2 ... Return bend (other bend part) 2 '... Return bend (bend part to which a temperature detection body is welded) 3 ... Tube (straight pipe part) 4 ... Fin (heat sink) 6 ... Tube group 8 ... Temperature detector

Claims (1)

[Scope of utility model registration request] 1. A tube group comprising a plurality of straight pipe portions penetrating a heat dissipation plate and bent portions respectively connecting the straight pipe portions, and a temperature which is welded to the pipe group and detects a surface temperature of the pipe group. A heat exchanger for an air conditioner equipped with a detection body, characterized in that the wall thickness of the bent portion to which the temperature detection body is welded is made larger than the wall thicknesses of other bent portions. Heat exchanger.