JPS60186671A - Air-cooled heat pump type air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a refrigeration system for cultivating plants, etc., and particularly relates to a refrigeration cycle suitable for an air-cooled heat pump system for cooling and heating operation at a low temperature of about 10'C. Background] Figure 1 shows a conventional general refrigeration cycle.

The cooling cycle consists of a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, a pressure reducer 4, 7, a check valve 5, 8, a refrigerant tank 6, a user heat exchanger 9, and an accumulator 10. The refrigerant path is from the compressor 1 to the four-way valve 2, the heat exchanger 3, the check valve 5, the liquid tank 6, the pressure reducing device 7, the heat exchanger 9, and the accumulator 10, as is well known.

During heating, the four-way valve 2 is switched so that the water flows toward the heat exchanger 9. Since these principles are well known, there is no room for special explanation. Here, if the refrigeration equipment for general air conditioning is used as is for low-temperature cooling, the heat on the user side will be lost.

Frost builds up on the exchanger, rendering it inoperable. Therefore, it is necessary to increase the air volume and provide a sufficiently large heat transfer area to prevent frost formation. On the other hand, in heating operation, the lower the temperature on the user side, the smaller the capacity of the heat exchanger is required. In the case of a heating and cooling system that is used in a low temperature range, there are two conflicting aspects, and a normal heating and cooling system cannot be used as is, and complex control is required to match the heat exchangers.

[Object of the invention] As mentioned in the previous section, the object of the invention is to adjust the capacity of a heat exchanger without complicated control, thereby simplifying the refrigeration cycle and improving reliability. It's there. As a result, cheaper products can be offered to the market.

[Summary of the invention]

The present invention requires the heat exchanger on the user side to be made larger when cooling and smaller when heating, so it does not use solenoid valves, etc., and improves reliability by utilizing changes in the flow direction, and eliminates the need for external control. The new approach thus results in lower cost products than previously available methods.

[Embodiments of the invention]

FIG. 2 shows an embodiment of the invention. The configuration is the same as that in FIG. Further, a feature of the present invention is that the refrigerant collecting pipe is installed so as to overlap the refrigerant collecting pipes 9a and 9b, and a check valve is attached to the collecting pipe side of 9b. With the above configuration, during cooling, refrigerant passes through the compressor 1, the four-way valve 2, the heat exchanger 3, the check valve 5, the liquid tank 6, the pressure reducing device 7, and the user-side heat exchanger 9, and then from the accumulator 10 to the compressor. Sent sequentially. In the heat exchanger 9, the heat flows from the direction of the check valve 9b so that the entire heat transfer area is effectively utilized.

On the other hand, during heating, high-temperature, high-pressure gas refrigerant flows to the heat exchanger 9 by switching the four-way valve 2 as in the conventional case.

At this time, due to the directionality of the check valve 11, the flow is limited to the collector pipe 9a, and the heat transfer area is reduced to about half. Also, the collecting pipe 9a
Since and 9b are in contact with each other to facilitate heat exchange, the temperature of 9b also increases due to the thermal energy of the high temperature refrigerant. Therefore, the refrigerant does not stagnate in the heat exchanger tube on the side 9b where there is no flow. The refrigeration cycle is completed through a normal cycle including the heat exchanger 9, the pressure reducing device 4, and the heat exchanger 3.

〔Effect of the invention〕

According to the present invention, desired control can be performed without using complicated control, electromagnetic valves, or relay circuits. Therefore,
An inexpensive and highly reliable method can be obtained.

[Brief explanation of the drawing]

FIG. 1 shows a conventional refrigeration cycle, and FIG. 2 shows a refrigeration cycle according to the present invention.

Claims (1)

[Claims] (1) In an air-cooled heat pump type refrigeration cycle consisting of a compressor, a four-way switching valve, a condenser, a refrigerant pressure reduction device, an accumulator, an evaporator, piping connecting these, a blower, and control equipment, the evaporator is closed during cooling operation. The heat exchanger has a sufficiently large heat transfer area so that it can operate without frost formation even when the room temperature drops to about 10℃, and when operating the heat pump, the heat transfer area is only used to about half that of an evaporator. One end of the refrigerant inlet and outlet is connected to one collecting pipe, and the other end is divided and connected to two collecting pipes, and one of the two divided collecting pipes is equipped with a check valve so that the refrigerant only flows when it is hot. An air-cooled heat pump type air-conditioning/heating device characterized in that the collecting pipes which are further divided into two parts are brought into contact with each other and overlapped to conduct heat.