JPS6370093A - Heat exchanger - Google Patents

Abstract

PURPOSE:To reduce the danger of generating a poisonous gas even if a heat transfer pipe is broken and realize a large cost-down and make the construction of a heat exchanger compact by arranging a flow passage for a high temperature gas and a flow passage for a coolant in such a way that both flow passages exchange heat mutually through fins. CONSTITUTION:A heat transfer tube 1 through which a high temperature gas passes and a heat transfer pipe 2 through which a coolant passes pierce respectively a plurality of fins 3 and are in close contact with the fins 3. Even if the heat transfer pipe 1 for the high temperature gas here is broken, the danger that the coolant is heated and a poisonous gas is generated is reduced. When the room cooling operation is in progress, the coolant which is compressed by a compressor 6 exchanges heat with the atmospheric air sent by a blower 5 in an outdoor heat exchanger 4 which also functions as a coolant heater, and the coolant is condensed. And then, this condensed coolant is expanded by a pressure reducing mechanism 8 and exchanges heat with the air in a room in an indoor heat exchanger 9 to be evaporated and then it is sucked into the compressor. Next, during the room heating operation the coolant sent by the compressor 6 exchanges heat with the air in the room in the indoor heat exchanger 9 to be condensed. If the outdoor heat exchanger 4 which also functions as a coolant heater is used in this way, it has the favorable effects that an unnecessary unit is eliminated and a large cost-down is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a heat exchanger in which high temperature gas such as combustion gas and a refrigerant exchange heat.

2. Description of the Related Art As shown in FIG. 4, a conventional heat exchanger of this type has a structure in which a heat transfer tube through which a refrigerant passes is closely attached to a combustion tube a through which high-temperature gas such as combustion gas passes.

Problems to be Solved by the Invention However, with the above configuration, if the combustion tube a is torn and the heat transfer tube is torn, the refrigerant leaking from the heat transfer tube may be directly heated and toxic gas may be generated. It was very dangerous. Further, there are cases where the conventional heat exchanger shown in FIG. 4 is used as a refrigerant heater in an air-conditioner/heater. In this case, as shown in Fig. 5, the refrigerant heater C1 compressor d, four-way valve e, outdoor heat exchanger f, pressure reducing mechanism g, and indoor heat exchanger are each connected in a ring. was. When the conventional heat exchanger shown in FIG. 4 is used as a refrigerant heater in the cycle shown in FIG. 5, the outdoor heat exchanger is not required for heating, and the refrigerant heater C is not required for cooling. This increases the cost of the device and also makes it difficult to make it compact. Furthermore, there is a drawback that the refrigerant accumulates in the outdoor heat exchanger jlf, which is unnecessary during heating, and the heating effect is reduced.

The present invention solves such conventional problems by allowing heat exchange between high-temperature gas and refrigerant through fins, thereby preventing direct contact between high-temperature gas and refrigerant pipes, and preventing refrigerant from directly contacting pipes. The purpose is to enable the heater to be used as both a heater and an outdoor heat exchanger.

Means for Solving the Problems In order to solve the above-mentioned problems, the heat exchanger of the present invention has a configuration in which a flow path through which high-temperature gas passes and a flow path through which refrigerant flows are arranged for heat exchange through fins. It is equipped with the following.

According to the above-described configuration, the present invention arranges the flow path through which the high-temperature gas passes and the flow path through which the refrigerant passes through the fins in a heat exchange manner. Since there is no contact between the refrigerant and the flow path, even if both flow paths are broken, the refrigerant is less likely to be heated. Furthermore, since the flow path through which the refrigerant passes can exchange heat with the atmosphere via the fins, it can function as both a refrigerant heater and an outdoor heat exchanger by causing forced convection with a blower or the like.

Embodiments Hereinafter, embodiments of the present invention will be described based on FIG. 1 of the accompanying drawings. In FIG. 1, a high-temperature gas heat exchanger tube 1 through which high-temperature gas passes and a refrigerant heat exchanger tube 2 through which a refrigerant passes are located at a certain distance apart, and each heat exchanger tube passes through a plurality of fins 3 and The heat exchanger tube 1 for high temperature gas and the heat exchanger tube 2 for refrigerant are in close contact with the fins 3.

In the above configuration, the high temperature gas heat exchanger tube 1 is torn, and
In the event that the refrigerant heat exchanger tube 2 is torn, since the two heat exchanger tubes are located at a certain distance apart, there is an effect that the risk of the refrigerant being heated and generating toxic gas is reduced.

Also, a case will be described in which the heat exchanger shown in FIG. 1 is used as both a refrigerant heater and an outdoor heat exchanger in a refrigeration cycle. As shown in FIG. 2, in this case, an air blower 5 is attached to the outdoor heat exchanger 4 that also serves as a refrigerant heater, and when used as an outdoor heat exchanger (during cooling operation), air is blown by the air blower 5, and the refrigerant is When used as a heater (during heating operation), the blower 5 is stopped. This will be explained using FIG. In FIG. 3, a compressor 6, a four-way valve 7, an outdoor heat exchanger 4 that also serves as a refrigerant heater, a pressure reducing mechanism 8, and an indoor heat exchanger 9 are each connected in a ring. Further, the outdoor heat exchanger 4 that also serves as a refrigerant heater is equipped with a blower 5.
0 is a combustion section, 1 is a heat exchanger tube for high temperature gas, and 2 is a heat exchanger tube for refrigerant. During cooling operation, the refrigerant compressed by the compressor 6 is condensed by exchanging heat with the atmosphere blown by the blower 5 in the outdoor heat exchanger 4 which also serves as a refrigerant heater. Then, it expands in the pressure reducing mechanism 8, exchanges heat with indoor air in the indoor heat exchanger 9, evaporates, and is sucked into the compressor. Next, during heating operation, the refrigerant sent by the compressor 6 exchanges heat with indoor air in the indoor heat exchanger 9 and is condensed. The gas is then expanded in the pressure reducing mechanism 8, exchanges heat with the high temperature gas combusted in the combustion section 10 in the refrigerant heater/outdoor heat exchanger 4, evaporates, and is then sucked into the compressor. however,
In this case, the blower 5 is stopped. In this way, by using the outdoor heat exchanger 4 that also serves as a refrigerant heater, there are no unnecessary parts for heating and cooling, which has the effect of significantly reducing costs compared to the conventional method.

Effects of the Invention As described above, the heat exchanger according to the invention provides the following effects.

(1) The refrigerant heat transfer tube through which the refrigerant passes and the high temperature gas heat transfer tube through which the high temperature gas passes are arranged at a predetermined interval for heat exchange through fins, so that both the heat transfer tubes This has the effect of reducing the risk of the refrigerant heating up and generating toxic gas even if it breaks.

(2) Also, since the configuration is as described above,
If the heat exchanger according to the present invention is equipped with an air blower, it can be used both as a refrigerant heater and as an outdoor heat exchanger during the refrigeration cycle, and air-conditioning operation is possible. Therefore, what previously required separate heat exchangers, such as an outdoor heat exchanger for cooling and a refrigerant heater for heating, can be combined into one heat exchanger, resulting in significant cost reductions. This has the effect of making the device more compact.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a heat exchanger showing an embodiment of the present invention, Fig. 2 is a perspective view of the heat exchanger when it is used as an outdoor heat exchanger that also serves as a refrigerant heater, and Fig. 3 is a perspective view of the heat exchanger showing an embodiment of the present invention. Fig. 4 is a perspective view of a conventional heat exchanger, and Fig. 5 is a configuration diagram of a conventional heating/cooling device. be. 1...Heat transfer tube for high temperature gas, 2...Heat transfer tube for refrigerant, 3...Fin. Name of agent: Patent attorney Toshio Nakao and 1 other person1-
Full 3 scraps 4 yen 1 Erasukura 2-1 Ichiichi Horougiden Tsukuiku 3-7A An 1st figure 2nd figure 3rd figure 4 figure 6 figure 5

Claims (1)

[Claims] A heat exchanger in which a large number of high temperature gas heat transfer tubes and a large number of refrigerant heat transfer tubes are separated by a predetermined interval, and the heat transfer tubes are inserted perpendicularly into a large number of parallel fins for heat exchange.