JPS61211670A - Heat pump type refrigerant controller - 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 the Invention The present invention relates to a refrigerant control device in a heat pump air conditioner equipped with an inverter compressor.

Conventional technology Conventionally, a multi-chamber heat pump type air conditioner equipped with an inverter-controlled compressor is as shown in Figure 2.
Compressor controlled by inverter 1° Four-way valve to switch refrigerant flow path 2. Outdoor heat exchanger 3゜Electric expansion valve 4. Receiver6.
A first capillary tube 6, a second capillary tube 7 in the parallel circuit, and a liquid side solenoid valve 8 in the parallel circuit.
9. Also in the parallel circuit, No. 1 indoor unit 1o, No. 2 indoor unit 1
1, each indoor heat exchanger 12, 13, also in parallel circuit,
Liquid-side solenoid valves 14 and 15 are provided in a bypass circuit of the liquid-side solenoid valve in connection with check valves 16 and 17 and a four-way valve 2 that are open during cooling. On the other hand, a high-pressure pressure regulating valve 2o is provided in the middle of the pipe 19 communicating with the discharge pipe 18 of the compressor 1,
A circuit connected to the liquid receiver 6 via the third capillary tube 22 and the check valve 23 through the auxiliary heat exchange section 21 configured integrally with the outdoor heat exchanger 3, and the high-pressure pressure regulating valve 20.
A circuit led out from between the auxiliary heat exchange section 21 and connected to the suction pipe 26 via the fourth capillary tube 24 is provided. 26 is a high-pressure pressure sensor, and 26 is a low-pressure pressure sensor.

The solid line arrow indicates a refrigerant circuit during cooling, and the dotted line arrow indicates a refrigerant circuit during heating.

In such a circuit, heating operation (heat pump operation)
Then, as shown by the dotted line arrow, compressor 1° four-way valve 2. Gas side solenoid valves 14 and 15, each indoor unit 10.11, each liquid side solenoid valve 8 and 9, each capillary tube 6.7, liquid receiver 5, electric expansion valve 4, outdoor heat exchanger 3, four-way valve 2 is circulated. When the outside air temperature becomes high and the load becomes small, the pressure in the discharge pipe 18 becomes high, and when the pressure becomes high, the high-pressure pressure regulating valve 20 starts to open, and a part of the refrigerant is transferred to the auxiliary heat exchanger. 21 and is condensed in the third capillary tube 22. It is bypassed to the liquid receiver 5 through the check valve 23.

Note that the circuit of the fourth capillary tube 24 is provided to draw out a liquid pool in the auxiliary heat exchange section 21 during heating and cooling.

Problems to be Solved by the Invention In such a conventional refrigerant circuit, a problem occurs when heating operation is performed. In other words, when switching from simultaneous operation of the No. 1 indoor unit 1o and No. 2 indoor unit 11 to operation of one of them during heating, until now the compressor 1 has been refrigerant circulating with two units operating simultaneously. In order to secure the amount of gas, the system was operated at high speed under inverter control, but by switching to single unit operation, either one of the gas side solenoid valves 14 and 15 is closed, and the pipe 27 flowing from the four-way valve 2 is closed. Since the amount of refrigerant is limited, the pressure in the discharge pipe 18 increases abnormally. Due to this pressure increase, the high-pressure pressure regulating valve 2o
However, before this high-pressure pressure regulating valve 2o opens, the discharge pressure and the operating current increase rapidly,
There was a problem in which the protection device of the compressor 1 was activated and the compressor 1 stopped.

The present invention addresses such an increase in operating current during heating,
The purpose is to prevent the compressor protection device from operating due to this.

Means for Solving the Problems The present invention provides a switching bypass pipe branched from between a four-way valve and a gas-side solenoid valve and connected between a high-pressure pressure regulating valve and an auxiliary heat exchange section of an outdoor heat exchanger. A switching solenoid valve is installed in the middle of the heating system, which opens only for a certain period of time when switching from simultaneous operation of two heaters to operation of one heater.

Function During heating operation, when switching from simultaneous operation of two units to single unit operation, the switching solenoid valve is opened for a certain period of time, and some high-pressure gas refrigerant is integrated with the outdoor heat exchanger. The liquid is condensed through the auxiliary heat exchange section and bypassed to the receiver side to suppress a sudden increase in current and prevent the compressor protection device from operating.

Example An embodiment according to the present invention will be described based on FIG.

3o is a compressor controlled by an inverter, 31 is a four-way valve that switches refrigerant during cooling and heating, 32 is an outdoor heat exchanger, 33 is an electric expansion valve for heating and cooling, and 34 is a receiver that adjusts the amount of refrigerant circulated. The liquid container 36 is a first capillary tube, and a second capillary tube 36 is provided in a parallel circuit.

37.38 is the liquid side solenoid valve installed in the same parallel circuit, 39
is the indoor heat exchanger of the No. 1 indoor unit 4o, and 41 is the indoor heat exchanger of the No. 2 indoor unit 4
The indoor heat exchanger 43 and 44 are gas-side solenoid valves provided in a parallel circuit, and the bypass circuit is provided with check valves 45 and 46 that are open during cooling. 47.48
is a pressure equalization circuit, which is equipped with an inverted f-glue 49.50 and a capillary tube 51.52. Reference numerals 53 and 54 designate injection circuits during heating, which are provided with check valves 55, B6, and capillary tubes 67 and 58. Reference numeral 69 denotes an injection circuit during cooling, which is connected to the compressor 3o via a check valve 60 and a capillary tube 61. 62
is a high-pressure pressure regulating valve branched from the discharge pipe 63 and installed in the middle of the pipe 64, which is connected to the auxiliary heat exchange section 65 which is integrated with the outdoor heat exchanger 32, and which is connected to the third capillary tube 66° It is connected to the liquid receiver 34 via a stop valve 67 . Reference numeral 68 denotes a refrigerant recovery pipe, which is connected to the suction pipe To via a fourth capillary tube 69 in order to prevent liquid refrigerant from accumulating in the auxiliary heat exchange section 66. A switching bypass pipe 71 branches from between the four-way valve 31 and the gas-side electromagnetic valves 43 and 44, and is connected to the pipe 68. This connection may be made between the high-pressure pressure regulating valve 62 and the auxiliary heat exchange section 66 . 72 is a switching solenoid valve provided in the middle of the switching bypass pipe 71, and this switching solenoid valve 72 operates for a certain period of time, for example, 1 minute, when switching from simultaneous operation of two units to operation of one unit during heating operation. This is a solenoid valve that is opened only for a period of time long enough to prevent pressure rise in the discharge pipe 63 and prevent the protection device of the compressor from operating, and then closed after a certain period of time. 73 is a high pressure sensor led out from the discharge pipe 63, and 74 is a low pressure sensor led out from the suction pipe 70.The solid line arrow indicates the refrigerant circulation circuit during cooling, and the dotted line arrow indicates the refrigerant circulation circuit during heating. The refrigerant circulation circuit is shown.

In the above configuration, during heating, the refrigerant is circulated as indicated by the dotted line arrow. In other words, assuming that two heaters are operated simultaneously, compressor 3o - four-way valve 31 - gas side solenoid valve 43.44 - No. 1 indoor unit 40. No. 2 indoor unit 42 - liquid side solenoid valve 37.38 -
First capillary tube 36. Second capillary tube 36 - Receiver 34 - Electric expansion valve 33 - Outdoor heat exchanger 32
- Circulated with four-way valve 31 - compressor 3o, No. 1 indoor unit 4o
and the No. 2 indoor unit 42 are simultaneously operated for heating. For example, suppose that the No. 1 indoor unit 4o is stopped from the simultaneous operation of the two units. Due to this stop, the gas side solenoid valve 43 is also closed, and at the same time, the switching solenoid valve 72 is opened, and the four-way valve 3
1, a part of the refrigerant flowing through the pipe 76 flows through the switching bypass pipe 71, and from the switching solenoid valve 72, the refrigerant flows through the pipe 68 - auxiliary heat exchange section 66 - third capillary tube 66 - check valve 67
- The refrigerant flows to the liquid receiver 34, and the refrigerant corresponding to the refrigerant flow rate flowing through the stopped indoor unit is stored in this liquid receiver. In this way, a part of the refrigerant is allowed to flow to the liquid receiver 34 side for a certain period of time,
The discharge pressure from the discharge pipe 63 of the compressor 3o is suppressed, and the switching solenoid valve 72 is opened after a certain period of time has elapsed to relieve the pressure and stabilize the heat pump cycle before the protection device due to abnormally high pressure is activated. Effects of the Invention As described above, the present invention provides a branch between the four-way valve and the layer-side solenoid valve, and a branch between the pressure regulating valve and the auxiliary heat exchange section, or between the auxiliary heat exchange section and the four-way valve. A switching bypass pipe is connected in the middle of the refrigerant recovery pipe, and a switching solenoid valve is installed in the middle of the switching pipe that opens only when switching from simultaneous operation of two heaters to operation of one heater. Since it is equipped with
When switching to single-unit operation, some of the refrigerant that has passed through the four-way valve flows to the receiver side, so the pressure in the discharge pipe does not rise much, and therefore, a sudden increase in current is suppressed. , the compressor protection device will not operate unnecessarily.

Then, after switching to single-unit operation, the refrigerant circulation by the inverter compressor becomes stable for a certain period of time (the time that the switching solenoid valve is open), so when it stabilizes, the switching solenoid valve is closed. By doing so, stable heating 1
This has the effect of allowing continuous heat pump operation.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a heat pump type refrigerant control device according to an embodiment of the present invention, and FIG. 2 is a circuit diagram of a conventional heat pump type refrigerant control device. 30...Compressor, 31...Four-way valve, 3
2...Outdoor heat exchanger, 33...-Electric expansion valve, 34...Liquid receiver, 37.38...
・Liquid side solenoid valve, 39.41... Indoor heat exchanger,
43.44...Gas side solenoid valve, 63...
・Discharge pipe, 64.68.71... Piping, 65.
...Auxiliary heat exchange section, 66...Third capillary tube, e7...Check valve, 72...
...Switching solenoid valve.

Claims (1)

[Claims] A heat pump refrigeration cycle with a compressor, four-way valve, outdoor heat exchanger, expansion device, liquid receiver, multiple liquid-side solenoid valves, multiple indoor units, and multiple gas-side solenoid valves, and compressor discharge. An auxiliary heat exchange section led out from the pipe and integrated with the outdoor heat exchanger, a capillary tube, and a high-pressure pressure regulating valve, the four-way valve, and the gas side in the middle of the pipe connected to the liquid receiver. In the middle of the switching bypass pipe that branches from the solenoid valve and connects between the high-pressure pressure regulating valve and the auxiliary heat exchange section, when switching from simultaneous operation of two heaters to operation of one heater, for a certain period of time. A heat pump type refrigerant control device equipped with a switching solenoid valve that is only open when the valve is open.