JPS6037377B2 - Air conditioner equipped with a medium heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an air conditioner capable of heating and cooling equipped with a heating device (which becomes cold soot in the case of cooling operation and becomes hot butterfly in the case of heating operation) on the discharge side of the compressor. A bypass circuit is provided between the air conditioner and the suction side, and the circuit is opened during medium heating and heating operation to reduce the compression ratio and reduce input to the compressor.

Generally, air conditioners are known that can perform heating operation by heating a medium with a medium heating device and circulating it with a compressor, and can also perform cooling operation with the same compressor. The air conditioners had the following drawbacks.

If the normal cooling cycle is reversed and a medium heating device is added to perform a medium heating heating operation, there is a disadvantage that power consumption increases, which is inconvenient when using the same compressor.

Also, some methods omit the pressure reducer from the above cycle and reduce the compression ratio to lower the compressor input, but if you try to reduce the compression ratio and obtain heating capacity, the suction pressure will increase. Due to this, the amount of media circulation increases,
The pressure loss in the piping increases, and as a result, the compression ratio does not decrease, and the compressor input does not decrease.

In order to solve the above conventional problems, the present invention provides a bypass circuit between the discharge side and the suction side of the compressor, and opens this bypass circuit during medium heating heating operation to remove a part of the medium. This bypass reduces the compression ratio of the compressor and reduces its input.

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a configuration diagram of an embodiment of the present invention.

In the figure, 1 is an indoor unit, which is equipped with an indoor heat exchanger 2 and an indoor fan 3. 4 is a medium heating device, and a medium heating section 5
, burner 6.

7 is an indoor unit, which includes a compressor 8, a solenoid switching valve 9, an outdoor heat exchanger 10, an outdoor fan 11, and a solenoid valve (normally closed) 12,1
3, equipped with pressure reducers 14, 15, check valves 16, 17, 18
, 19 are bypass circuits that are opened during medium heating heating operation.

Further, in the figure, solid line arrows indicate the medium flow direction during cooling operation, and broken line arrows indicate the medium flow direction during medium heating heating operation. In addition, in this example, the medium heating device is a gas combustion type,
Although the burner 6 is electrically lit, an electric heater or a kerosene furnace may be used instead.

FIG. 2 is a wiring diagram showing the control circuit of the embodiment, in which the same parts as in FIG. 1 are given the same numbers and their explanation will be omitted.

2 is the main switch, 21 is the air conditioning/heating selector switch, C is the air conditioning contact, and day is the heating contact.

Further, V is a power source. Next, the operations of the embodiments shown in FIGS. 1 and 2 will be explained in the order of cooling operation and heating operation.

Cooling operation: - First, after closing the contact C side of the heating/cooling selector switch 21,
When the main switch 20 is closed, both the indoor and outdoor fans 3 and 11 and the compressor 8 start, the burner 6 misfires, the solenoid switching valve 9 opens the solid line path shown in Figure 1, and the solenoid valves 12 and 13 close. The state remains as it is.

As a result, the medium (this tin-combined cold soot) discharged from the compressor 8 passes through one of the solid line paths of the lightning switching valve 9 and reaches the outdoor heat exchanger 1, where it is radiated and condensed, and the check valve Passing through 16,
The pressure is reduced in the pressure reducer 15, the air passes through the medium heating device 4, and is evaporated and absorbed in the indoor heat exchanger 2, producing a cooling effect.

The medium is then sucked back into the compressor 8 via the other solid line path of the electromagnetic switching valve 9 and through the check valve 17. That is, in this case, the medium heating device 4 and the check valves 16 and 17 have no meaning at all, and this is a normal cooling cycle. Medium heating heating operation: -
When the main switch 20 is closed after closing the contact side of the air conditioning/heating selector switch 21, the indoor fan 3 and compressor 8 are started.
The outdoor fan 11 is stopped, the burner 6 is ignited, the electromagnetic switching valve 9 is switched to open the dotted line path in the figure, and the electromagnetic valves 12 and 13 are opened.

As a result, most of the medium discharged from the compressor 8 is sent to the indoor heat exchanger 2 through one of the dotted line paths of the electromagnetic sliding door valve 9, where it radiates heat and condenses to produce a heating effect. It is heated and vaporized in the section 5, returns to the compressor 8 via the solenoid valve 13 of the bypass circuit 18, and is sent out to the indoor heat exchanger 2 again.

Further, a part of the medium discharged from the compressor 8 is bypassed to the suction side of the compressor 8 through the solenoid valve 12 and the pressure reducer 14 in the bypass circuit 19 . In this case, the suction pressure of the compressor 8 is higher than that in the cooling cycle, and the compression ratio of the compressor 8 is lower, so that the input to the compressor 8 can be reduced.

That is, the role of the bypass circuit 19 is to reduce the amount of the main flow of the medium, thereby reducing the compression ratio and requiring less input. The main flow amount can be adjusted as desired by adjusting the resistance of the pressure reducer 14. Further, by appropriately selecting the diameter of the solenoid valve 12, the pressure reducer 14 can be omitted.
Note that the check valves 16 and 17 are provided to prevent the medium from accumulating in the outdoor heat exchanger 10 during this heating operation. FIG. 3 shows another embodiment of the present invention, which differs from the embodiment shown in FIG. 1 only in the location where the medium heating device 4 is installed. That is, in FIG. 1, the medium heating device 4 is the outdoor unit 7.
Although it is located outside of the
It is provided in the bypass circuit 18. Therefore, during cooling, the medium does not pass through the unnecessary medium heating device 4 at all, thereby preventing loss. As described above, according to the present invention, even though the compression ratios are completely different during cooling and heating, one compressor can perform the above two types of operation, and the following effects are achieved. .

In the following, all heating will be medium-heated heating. {1} Electrical input for heating can be significantly reduced compared to heat pump heaters while maintaining cooling capacity.

[21] Since one ordinary cooling compressor is sufficient, it is cost-effective compared to methods such as variable capacity compressors, pole number conversion compressors, or two compressors with different capacities.

{3} Since there is no need to change the compressor itself, there is no need for a large-scale electromagnetic container, the electric circuit can be simplified, and it is advantageous in terms of cost.

'141 The degree of superheating of the suction of the compressor can be adjusted arbitrarily using the bypass circuit pressure reducer, which prevents liquid compression and protects the compressor.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of one embodiment of the present invention, FIG. 2 is an electric circuit diagram of the embodiment of FIG. 1, and FIG. 3 is a diagram showing the configuration of another embodiment of the present invention. It is a line diagram. 2... Indoor heat exchanger, 4... Medium heating device, 8... Compressor, 9... Solenoid switching valve, 10...・Indoor heat exchanger, 14, 15...
...Pressure reducer, 18,19...Bypass circuit. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A cooling cycle consisting of a compressor, a switching valve, an outdoor heat exchanger, a pressure reducer, and an indoor heat exchanger, and this cycle is reversed to add a medium heating device, and the pressure reducer and outdoor heat exchanger are added. The compressor is equipped with a bypass circuit that connects the discharge side and suction side of the compressor with a pressure reducer and is opened only during medium heating heating operation. An air conditioner equipped with a medium heating device.