JPH0323763U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a functional correspondence diagram of the air conditioner according to the invention of claims 1, 2 and 3, and Fig. 2 is a functional correspondence diagram of the air conditioner according to the invention of claims 1, 2 and 3. A refrigerant circuit diagram of such an air conditioner, FIGS. 3 and 4 are a flow chart and a time chart for explaining the operation control of the air conditioner according to the first embodiment, and FIG. 5 is a refrigerant circuit diagram of the second embodiment of the present invention ( That is, the refrigerant circuit diagram of the air conditioner according to the embodiment corresponding to the invention of claim 3, FIG. 6 is a functional correspondence diagram of the air conditioner according to the invention of claim 4, and FIG. 7 is the implementation of the invention. Refrigerant circuit diagram of an air conditioner according to Example 3 (that is, an embodiment corresponding to the invention of claim 4), No. 8
9 and 9 are a flowchart and a time chart for explaining the operation control of the air conditioner according to the third embodiment, and FIG. 10 is a time chart for explaining the operation control of the conventional air conditioner. 1... Compressor, 4... Pressure reducing means (electronic expansion valve)
, 4a...temperature-sensitive expansion valve, 4b...bypass passage,
4c...Opening/closing valve, 9...Thermostat, 11...
...High pressure control switch, 12... Control means, 13...
...Decompression action release means, 14...Return means, 15...
...judgment means, 16... operation restart means, X... refrigerant circuit.

Claims (1)

[Claims for Utility Model Registration] 1. A pressure reducing means 4 for reducing the pressure of the refrigerant supplied to the heat exchanger acting as an evaporator, and a pressure reducing means 4 that is activated when the high pressure in the refrigerant circuit X reaches a predetermined value. In an air conditioner equipped with a high-pressure control switch 11 that acts to reduce the high-pressure pressure to a predetermined value or less, and a thermostat 9 that outputs an operation control signal in response to the indoor load, the operation of the high-pressure control switch 11 The decompression action release means 13 acts to release the pressure reduction action of the pressure reduction means 4 when the operation stop signal is outputted from the thermostat 9 later, and the pressure reduction action is released by the pressure reduction action release means 13. The air conditioner is further equipped with a return means 14 that operates to return the pressure reduction means 4 to the reduced pressure state when the thermostat 9 is activated when the high pressure control switch 11 returns due to a decrease in the high pressure caused by the high pressure. . 2. The pressure reduction means 4 is constituted by an electronic expansion valve whose opening is controlled by a pulse motor, and the pressure reduction release means 13 performs the pressure reduction release action by fully opening the electronic expansion valve 4, and the return means 2. The air conditioner according to claim 1, wherein the return to the reduced pressure state by the step 14 is performed by returning the electronic expansion valve to a minimum opening. 3. The pressure reducing means 4 is connected to a temperature-sensitive expansion valve 4a and a bypass passage 4b connected in parallel with the temperature-sensitive expansion valve 4a.
and an on-off valve 4c interposed in the bypass passage 4b, the depressurization release means 13 performs the depressurization release action by opening the on-off valve 4c, and the return means 14 restores the reduced pressure state. The air conditioner according to claim 1, wherein the action is performed by closing the on-off valve 4c. 4. A high pressure control switch 11 that operates when the high pressure in the refrigerant circuit A reaches a predetermined value and issues a command to reduce the high pressure, and a thermostat 9 that outputs an operation control signal in response to the indoor load. In the air conditioner equipped with the above-mentioned air conditioner, a determining means 15 for determining whether or not the high-pressure control switch 11 has been reset when the thermostat 9 is turned OFF and ON after the high-pressure control switch 11 is activated; An air conditioner characterized in that the air conditioner is further equipped with an operation restart means 16 that outputs a command to restart the operation of the air conditioner only when the determination means 15 determines that the high pressure control switch 11 has returned.