JPH0413063A - Air conditioner - Google Patents

Abstract

PURPOSE:To make it possible to collect a refrigerant solution built up in an accumula tor promptly and definitely by installing a solenoid valve which reaches on/off opera tion at a proper interval during refrigerant collection operation to a bypass pipe of suction and discharge of a compressor when starting heating operation. CONSTITUTION:A solenoid valve 32 is installed to a bypass pipe 35 which bypasses a discharge pipe 33 and a suction pipe 34 of a compressor 1. Prior to heating operation, collection operation is carried out to collect refrigerant into a heating circuit side present in an outdoor heat exchanger 5, an accumulator 9, and a compressor 1. A four way valve 4 is directed at the same direction as it is during heating operation. The refrigerant in the outdoor heat exchanger 5, the accumulator 9 and the compressor 1 is collected into an indoor heat exchanger 7 by driving the compressor 1 under the condition when the outdoor heat exchanger is coupled with the accumulator 9. At that time, when a fourth solenoid valve 2 is opened and closed at a proper interval to increase the pressure of the accumulator 9, it is possible to increase a circulation flow rate of the compressor 1 and collect the refrigerant built up in the accumulator 9 into a heating circuit side promptly, which makes it possible to speed up the starting of the heating operation and carry out stabilized heating operation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating/cooling machine that uses a compressor for cooling, and uses a refrigerant conveying means other than the compressor and a refrigerant heater for heating.

2. Description of the Related Art Conventionally, this type of heating/cooling device has been disclosed, for example, in Japanese Patent Application Laid-open No. 57-1012.
As shown in Japanese Patent No. 63, it has a configuration as shown in FIG.

That is, a compressor 1 equipped with a compressor heater 2. Four-way valve 3. Outdoor heat exchanger4. Fan for outdoor heat exchanger5. First solenoid valve6. Capillary tube 7, indoor heat exchange 18.
Indoor heat exchanger fan 9° 2nd solenoid valve] 0. Check valve 11
．． Accumulator 12. Third solenoid valve 13, refrigerant pump 1
4. Refrigerant heater 15. In the configuration of the burner 16, for cooling, the outdoor heat exchanger 4 is used as a condenser, and the indoor heat exchanger 8 is used as an evaporator, forming a cooling cycle by operating the pressure II machine 1. For heating operation, the refrigerant heating 115 is used as the burner 6. By heating it, it becomes an evaporator, and the indoor heat exchanger 8 becomes a condenser,
A heating cycle is configured using a refrigerant pump as a refrigerant transport means, and the pressure! In order to prevent refrigerant from accumulating in compressor 1 and shorten pump-down operation, compressor 1 is heated by compressor 2.
is heated and maintained at a constant temperature.

With the above configuration, when heating operation starts, the first solenoid valve 6 is closed and the four-way valve 3 is compressed! After the refrigerant gas discharged from No. 1 is switched to flow to the indoor heat exchanger 8, and the compressor 1 performs pump-down operation with the indoor heat exchanger fan 9 stopped, the refrigerant bomb 14, the refrigerant heater I5, and As soon as the indoor heat exchanger WAH fan 9 starts operating, compression 8!
11 is configured to stop.

Problems to be Solved by the Invention However, with the above configuration, at the start of heating operation,
It is assumed that the compressor has been sufficiently heated by the compressor heater. In situations where there is a lot of refrigerant leakage, the refrigerant cannot be sufficiently recovered to the heating circuit within the set pump-down time, and the temperature of the refrigerant heater may rise abnormally during heating operation. This caused problems such as the inability to perform normal heating operation.

The present invention is intended to solve such conventional problems, and an object of the present invention is to sufficiently recover refrigerant to the heating circuit at the start of heating operation, thereby enabling stable heating operation.

Means for Solving the Problems In order to solve the above problems, the heating/cooling device of the present invention has a refrigerant circuit composed of a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a throttle device during cooling, and a refrigerant circuit during heating. The refrigerant circuit consists of a refrigerant conveying means other than a compressor, a refrigerant heater having a heating means, and an indoor heat exchanger, and is a solenoid valve that can be repeatedly opened and closed at appropriate time intervals during refrigerant recovery operation at the start of heating operation. The compressor is arranged in the discharge and suction bypass pipes of the compressor.

Effects With the above-described configuration, the present invention enables stable heating operation by quickly and reliably recovering the refrigerant liquid accumulated in the accumulator during the refrigerant recovery operation at the start of heating operation.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 shows a system block diagram of one embodiment of the present invention. In Fig. 1, 1 is a compressor, 2 is a compressor heater provided at the bottom of the compressor 1, 3 is a first check valve provided in the discharge pipe of the compressor 1, and 4 is a four-way valve. , 5 is an outdoor heat exchanger, 6 is an outdoor heat exchanger blower, 7 is an indoor heat exchanger, 8 is an outdoor heat exchanger blower, 9 is an accumulator, l
O is a refrigerant heater, 11 is a combustion burner for heating the refrigerant heater 10, 12 is a gas-liquid separator, 13 is a liquid receiver,
Reference numeral 14 denotes a first electromagnetic valve that positions the upper part of the gas-liquid separator 12 in a pipe 15 that connects the upper part of the liquid receiver 13. 16 is a second check valve that connects the lower part of the liquid receiver 13 and the gas-liquid separator 12.
and the lower part of the pipe I7. 18 is the third
The check valve is located in the pipe 19 connecting the indoor heat exchanger 7 and the upper part of the liquid receiver 13. A fourth check valve 20 is located in a pipe 22 that connects the upper part of the gas-liquid separator 12 and a pipe 21 that connects the first check valve 3 and the four-way valve 4. 23
24 is a first capillary tube, 24 is a second solenoid valve, and this first capillary tube 23 and second W solenoid valve 24 are a pipe 25 connecting the outdoor heat exchanger 5 and the lower part of the refrigerant heater 0.
be placed in series inside. 2G is a third IN valve, 27 is a second capillary tube, the third solenoid valve 26 and the second capillary tube 27 are a pipe 28 connecting the lower part of the gas-liquid separator 12 and the lower part of the refrigerant heater] 9 in series in the pipe 29 connecting the two. The upper part of the refrigerant heater 10 and the upper part of the gas-liquid separator 12 are connected by a pipe 30. The first solenoid valve 14 and the second NN valve 24 are connected by a pipe 31. A fourth magnetic valve 32 is provided in a bypass pipe 35 that bypasses the discharge pipe 33 and suction pipe 34 of the compressor 1. 36
is a temperature detection means for detecting the temperature of the compression 891.

In the above refrigerant circuit configuration, cooling operation is performed by switching the four-way valve 4 so that the discharge gas of the compressor 1 flows to the outdoor heat exchanger 5, and opening the second solenoid valve 24 and the third solenoid valve 26 to ~ Bu 23 and second capillary tube 2
7 is a throttle device, and a refrigerant circuit is configured in which the indoor heat exchanger 7 acts as an evaporator. During heating operation, the four-way valve 4 is switched in the opposite direction to that during cooling operation, and the combustion burner 11 heats the refrigerant heater 10, so that the refrigerant in the refrigerant heater 10 is heated, and the gas-liquid separator 12 heats the refrigerant to a high temperature. The refrigerant in the gas phase is transferred to the pipe 22. Check valve 20. The refrigerant liquid is pushed out to the indoor heat exchanger 7 through the four-way valve 4, radiates heat in the indoor heat exchanger 7, heats the room, and is liquefied. Check valve 1
8 into the liquid receiver 13. By opening the first electromagnetic valve 14, the refrigerant liquid accumulated in the liquid receiver 13 is transferred to the second reverse by the head difference between the liquid receiver 13 and the gas-liquid separator 12. The liquid receiver 13 and the first
The opening/closing operation of the electromagnetic valve 14 and the check action of the third check valve 18 allow the refrigerant, which is a heat transfer medium, to be removed without operating the compressor 1. That is, the liquid receiver 13 and the first solenoid valve 14
The third check valve 18 becomes the refrigerant conveying means 37.

Before performing the above-mentioned heating operation, the outdoor heat exchanger that is not used as a heating circuit5. Accumulator9. A recovery operation is performed to recover the refrigerant in the compressor 1 to the heating circuit side. With the four-way valve 4 in the same direction as during heating operation and the outdoor heat exchanger 5 connected to the accumulator 9, compression III is operated to exchange indoor heat between the outdoor heat exchanger 5, accumulator 9, and refrigerant of the compressor 1. Collect into container 7. At this time, by opening and closing the fourth solenoid valve 32 at appropriate time intervals, the pressure in the accumulator 9 can be increased, thereby increasing the circulating flow rate of the compressor 1. Refrigerant can be recovered to the heating circuit side in a short time. Therefore, heating can be started quickly and stable heating operation is possible.

Effects of the Invention As described above, the heating/cooling machine of the present invention provides the following effects.

(1) By installing solenoid valves in the discharge and suction bypass pipes of the compressor that can be repeatedly opened and closed at appropriate intervals during refrigerant recovery operation at the start of heating operation, the pressure of the Akiemulator is increased and the circulation flow rate of the compressor is increased. Since the liquid refrigerant accumulated in the accumulator 9 can be recovered to the heating circuit side in a short time, heating can be started quickly and stable heating operation can be performed.

(2) When the compressor stops, the solenoid valve is opened to reduce the pressure difference between the discharge and suction to O, thereby ensuring that the compressor can be restarted.

[Brief explanation of drawings]

FIG. 1 is a system block diagram of a heating/cooling device according to an embodiment of the present invention, and FIG. 2 is a system block diagram illustrating a conventional example. 1...Compressor, 5...Outdoor heat exchanger,
7... Indoor heat exchanger, 10... Refrigerant heater, 23... First capillary tube, 27
・・・・・・Second cabilage, 32・・・・・・
・No. 41i1 magnetic valve, 35...Bypass pipe, 37
...Refrigerant conveyance means. Name of agent: Patent attorney Shigetaka Awano (1 person) Figure 2

Claims (1)

[Claims] During cooling, the refrigerant circuit is composed of a compressor, an indoor heat exchanger, an outdoor heat exchanger, and a throttle device, and during heating, it is composed of a refrigerant conveying means other than the compressor, a refrigerant heater with a heating means, and an indoor heat exchanger. A heating/cooling machine in which a solenoid valve that forms the refrigerant circuit and can be repeatedly opened and closed at appropriate intervals during refrigerant recovery operation at the start of heating operation is placed in the compressor discharge and suction bypass pipes.