JPS60238652A - Air conditioner functioning as air heating and cooling - 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 reducing the load on a compressor during heating operation in an air conditioner for heating and cooling. [Background of the Invention] Conventionally, this type of refrigeration cycle was the first It is as shown in Fig. 2. In other words, during heating operation, compressor 1, four-way valve 2,
Forming a refrigerant circuit of the indoor heat exchanger 8, check valve 6, capillary 5, outdoor heat exchanger 5, four-way valve 2, and compressor 1, and operating the outdoor blower 11 and the outdoor blower 9. This gives the well-known heating cycle. If the outside air width increases during this heating operation, the amount of heat absorbed by the outdoor heat exchanger 5 increases. Alternatively, if the dust removal filter attached to the intake air side of the indoor unit becomes clogged, the amount of heat released from the indoor heat exchanger 8 decreases, the discharge pressure from the compressor 1 increases, and the load on the compressor 1 increases. If this increases, there is a risk that the compressor 1 will lock or the heater, which is blown out at any time due to overcurrent in the compressor 1, may be blown out due to an increase in operating flow 710. To prevent this, the discharge is A pressure switch 10 that senses pressure is installed on a pipe that becomes a high-pressure side during heating operation, and when the discharge pressure reaches a certain set pressure, the pressure switch 10 operates and the screen shown in Figure 1 (@Freezing cycle in Figure 6) is activated.゛
- The outdoor fan 9 is stopped by switching the contacts of the pressure switch 1D from 10a-10b to 10a-10c, and in the cold α cycle shown in FIG. 2, the contacts of the pressure switch 10 change to 10a as shown in FIG. -1[]b to 10a-
Switching to 10c, the solenoid valve 12 is energized by Warukotoni 7
When the outdoor side blower 9 is stopped in FIG. Since the refrigerant evaporation temperature also decreases, there is a possibility that the flame removal thermometer 16, which is installed in close contact with the outdoor heat exchanger 6, enters the UFFL or defrost cycle. In addition, as shown in Fig. 4, the solenoid valve 12 is energized, and a portion of the refrigerant heat radiated by the indoor heat exchanger 1 f'
By bypassing it to the suction side of the compressor 1 via the magnetic valve 12, the amount of refrigerant circulated to the outdoor heat exchanger 6 is reduced, and the amount of heat absorbed by the outdoor heat exchanger 5 is reduced, resulting in a decrease in discharge pressure. However, it may become impossible to deal with the discharge pressure booster port due to an extreme decrease in the amount of heat dissipated due to filter clogging of the indoor unit, etc. [Objective of the Invention] The present invention solves the above problems. [Summary of the Invention] In other words, the present invention aims to provide a load reduction method that takes advantage of the advantages of the load reduction methods shown in Figs. 3 and 4 and improves the drawbacks of each of them. To achieve the above purpose, we installed a bypass passage that communicates between the 1 μm 1-temperature exchanger and the indoor heat exchanger and the suction side of the compressor, and installed a solenoid valve in this bypass passage to control the discharge pressure during heating operation. When the pressure exceeds a certain level, this solenoid valve is opened and the outdoor blower is stopped in conjunction with this, thereby improving the above-described problem. In Fig. 5, 1il- is a compressor, 2 is a four-way valve, 9 is an outdoor blower, and 10a.

1Llb and 10c are contacts of the pressure switch 10, 11 is an indoor blower, 12 is a solenoid valve shown in FIG. 2, 16 is a defrosting thermometer, a 14-digit main operation switch, and 15 is a changeover switch. When the main operation switch 14 and the changeover switch 15 are turned on, a well-known heating operation is performed. In this case, the amount of heat absorbed by the r+4 outside heat exchanger 6 increases due to a rise in outside air, or the indoor heat exchanger 8 increases due to clogging of the indoor unit's filter, etc.
When the discharge pressure increases due to a decrease in the amount of heat dissipated, the pressure switch 10 operates at a certain set pressure and the pressure switch 10
(Iri ra pointka 10 a 10 bka') 10
a 10 c, the outdoor fan 9 connected to IQb stops, and at the same time, the air is passed through the solenoid valve 12 connected to 1[]C, and the heat is radiated by the indoor heat exchanger 8. A part of the refrigerant is bypassed to the suction side of the compressor 1 via the solenoid valve 12. Since the high-pressure refrigerant before being depressurized by the capillary 4 is injected into the suction side of the compressor 1 as described above, the suction pressure of the compressor 1 increases and the suction temperature also increases, causing evaporation in the outdoor heat exchanger 6. Can prevent temperature drop,
Since the temperature of the outdoor heat exchanger 6 can always be maintained at a certain flow rate or higher, there is no possibility that the defrosting thermostat 16 will operate, and defrosting can be prevented from occurring during overload. In addition, a two-stage load reduction method is adopted, including a -Tfflt bypass of the refrigerant using the solenoid valve 12 and a method of stopping the outdoor fan 9, so that the indoor heat exchanger 8 is prevented from being discharged due to the indoor unit's filter clogging, etc. Even if the amount of heat is extremely reduced, the amount of suction in the outdoor heat exchanger 6 is largely reduced, so that the discharge pressure can be prevented from increasing.

[Effects of the Invention] As described above, as a load reduction method during heating overload according to the present invention, by linking the refrigerant partial bypass method using the solenoid valve 12 and the method of stopping the outdoor fan 9, it is possible to overcome the conventional method. The drawbacks of the load Qjlj reduction method can be improved, and the reliability and quality of the unit can be improved.

In addition, in the embodiment, by detecting the discharge pressure during heating,
The solenoid valve 12 and the outdoor blower 9 are controlled by a method that detects the temperature of the vibrator, which becomes high pressure during heating, or a method that detects the discharge air pressure of the indoor unit during heating.
It is no exaggeration to say that the same effects as those described above can be expected by controlling the outdoor side blower 9.

[Brief explanation of the drawing]

1, 2, 6, and 4 respectively show a conventional refrigeration cycle diagram and an electric circuit diagram, and FIG. 5 shows an electric circuit diagram of the present invention. 1... Compressor, 2... Four-way valve, 6... Outdoor heat exchanger 4.6... Capillary, 5, 7... Check valve, 8
... Indoor isolation exchanger, 9... Outdoor blower, 10.
・・Pressure Sino-/-110a, 10b, 10c',・
・Suction point of pressure suinochi 1U, 11... indoor blower,
12... Solenoid valve, 15... Defrost thermostat, 14...
Main operation switch, 15... Selector switch, Figure l Figure v2

Claims (1)

[Claims] 1. A refrigeration cycle consisting of a compressor, a four-way valve, an outdoor heat exchanger, a capillary, an internal heat exchanger, etc.
111 In an air conditioner capable of cooling and heating having an outdoor blower, a bypass passage is provided that communicates between the outdoor heat exchanger and the indoor heat exchanger and the suction side of the compressor, and a solenoid valve is installed in this bypass passage. 6. An air conditioner for both cooling and heating, characterized in that the solenoid valve is opened and the outdoor blower is stopped when the discharge pressure of the refrigerant exceeds a set pressure during heating operation. 2. The heating and cooling air conditioner according to claim 1, wherein the discharge pressure during heating operation is detected by detecting the temperature of the high-pressure side pipe. 6. The heating and cooling air conditioner according to claim 1, wherein the discharge pressure during heating operation is detected by detecting the discharge air temperature of the indoor unit.