JPH08145479A - Heat pump type refrigerating circuit apparatus - Google Patents

Abstract

PURPOSE: To provide a heat pump type refrigerating circuit apparatus in which power consumption can be saved. CONSTITUTION: The heat pump type refrigerating circuit apparatus comprises an operating mode changeover switch 18 for switching compressors 1, 2, 3, 4 to an operating circuit for operating small or large number of the compressors in response to a load by a controller 11 for switching the operation modes of the compressors 1, 2, 3, 4 according to the detected values of pressure sensors 20, 21 for detecting the pressures of the compressors 1, 2, 3, 4, an indoor side coil 12 and an outdoor side coil 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat pump type refrigeration circuit device used in an air conditioner.

[0002]

2. Description of the Related Art In recent years, a heat pump type refrigeration circuit device typified by a multi-chamber type uses a compressor having a large load fluctuation amount and a large capacity. Therefore, there is a demand for a heat pump type refrigeration circuit device that consumes high power and thus consumes low power.

The structure of a conventional heat pump type refrigeration circuit device will be described below with reference to FIG.

As shown in the figure, in the heat pump type refrigeration circuit device that flows in the cooling cycle, the refrigerant discharged from the compressor 101 flows through the four-way valve 102 and the outdoor coil 103 and is split into the expansion valves 104 and 105, and the indoor coil 106. 10,
After flowing through 7, the flow merges into the four-way valve 102 and the compressor 101
Enter the suction side of. In this case, the compressor 101 is connected to the commercial power source 1
An inverter device 109 and an on / off switch 110 are provided in the middle of a passage circuit for supplying electric power of 08, and these are a pressure sensor 112 for detecting the pressure of the outdoor coil 103 by a control device 111 and pressures of the indoor coils 106 and 107. It was controlled according to the detection values of the pressure sensors 113 and 114 that detect the.

Further, in JP-A-1-262390, a plurality of compressors having different capacities are switched and connected to an inverter device through an operation mode changeover switch, and the inverter device has a large capacity compressor when the load is high. Moreover, it has been proposed to prevent chattering by switching to a small capacity compressor when the load is low.

[0006]

Such a conventional heat pump type refrigeration circuit device requires a large-capacity compressor and has a problem that the power consumption is large in comparison with its capacity when operating in one room.

SUMMARY OF THE INVENTION The first object of the present invention is to provide a heat pump type refrigeration circuit device which can solve the above problems and can reduce the power consumption of an air conditioner.

A second object is to carry out continuous operation peculiar to the inverter by attaching an inverter device to this refrigeration circuit.

A third object is to enable simultaneous heating and cooling operation.

[0010]

In the heat pump type refrigeration circuit device of the present invention, in order to achieve the first object, the first means is provided in the refrigeration circuit with a large number of compressors having the same capacity. A pressure sensor for detecting the pressure of the indoor side coil and the outdoor side coil, a control device for switching the operation mode of the compressor according to the detection value of the pressure sensor, and a small number or a large number of the compressors by the control device. The operation mode changeover switch for changing over to the operation circuit for performing the above operation is provided so that a small number of compressors can be operated at a low load and a large number of compressors can be operated at a high load.

In order to achieve the second object, the second
This means has a configuration in which an inverter device is provided in the middle of an energizing circuit for supplying electric power of a commercial power source to the compressor.

In order to achieve the third object, the third
Means for dividing into a four-way valve provided in the refrigeration circuit, a diversion four-way valve, a solenoid valve provided between the diversion four-way valve and the compressor circuit and controlled by a controller, and the four-way valve and the diversion An outdoor coil consisting of two circuits provided in each circuit of the four-way valve and an indoor coil provided in each circuit of the outdoor coil are provided, and a cooling and heating operation can be performed simultaneously by switching the four-way valve and the shunt four-way valve. And

[0013]

According to the present invention, by the configuration of the first means described above, it is possible to switch to a small number of compressors when the load is low and to switch to a large number of compressors when the load is high to save power consumption.

Further, the structure of the second means enables continuous operation peculiar to the inverter.

Further, the structure of the third means enables simultaneous cooling and heating operation. In addition, in order to send the heating capacity to a necessary part when the heating capacity is reduced in winter, the unnecessary part can be cooled to prevent frosting of the condenser and improve the heating capacity of the necessary part.

[0016]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to FIG.
Will be described with reference to.

As shown in the figure, the compressors 1 having the same capacity,
After combining the discharge refrigerants of 2, 3, and 4, the discharge pipe 5,
A suction pipe 13, a four-way valve 9, an outdoor coil 10, an expansion valve 11, and an indoor coil 12 are sequentially passed through 6, 7, and 8.
The flow is divided into 14, 15, 16 and enters the suction side of each compressor 1, 2, 3, 4. A commercial power supply 17 is provided for each compressor 1, 2, 3, and 4.
Supply power. A pressure sensor 2 for detecting the pressure of the indoor coil 12 is provided with an operation mode changeover switch 18 and a compressor on / off contact 19 in the circuit.
0, pressure sensor 2 for detecting the pressure of the outdoor coil 10
A control device 22 for controlling according to the detected value of 1 is provided.

In the above configuration, the detection signals detected by the pressure sensor 20 provided on the indoor coil 12 and the pressure sensor 21 provided on the outdoor coil 10 are input to the control device 22 when the air conditioner is operating, and the control device 22 When it is determined that the load is low, the control device 22 switches the operation mode changeover switch 18 to the operation of a small number of units, for example, a small number of compressors 1 are operated, and when the control device 22 determines that the load is high, the control device 22 operates. Multiple compressors 2, 3, 4
Etc. are operated, and the compressors 1, 2, 3,
4 will be driven.

As described above, according to the heat pump type refrigeration circuit device of the first embodiment of the present invention, a small number of compressors are operated at a low load and a large number of compressors are operated at a high load.
Power is not wasted.

In the first embodiment, the number of compressors 1 is small and the number of compressors 2, 3, 4 is large.
It goes without saying that either three or four may be used to make a small number or a large number.

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to FIG.

Regarding the same parts as in the first embodiment,
The same reference numerals are given and detailed description is omitted.

As shown in the figure, each compressor 1, 2, 3, 4
In addition, the inverter device 23 is provided in the middle of the energizing circuit for supplying the electric power of the commercial power source 17.

In the above configuration, the detection signals detected by the pressure sensor 20 provided on the indoor coil 12 and the pressure sensor 21 provided on the outdoor coil 10 are input to the control device 22 when the air conditioner is operated, and the control device 22 then When it is determined that the load is increasing, the control device 22 switches the compressors 1, 2, 3, 4 in this order through the operation mode changeover switch 18 in accordance with the increase in the load.

At this time, after the compressor 1 reaches the high frequency upper limit region, the inverter is switched and connected to the compressor 2 by the inverter device 23 and sequentially connected to the compressors 3 and 4.

As described above, according to the heat pump type refrigeration circuit device of the second embodiment of the present invention, the compressors 1, 2, 3, 4 are sequentially switched and operated as the load increases, and the inverter device 23 continuously operates. It becomes possible to drive.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to FIG.

Regarding the same parts as in the second embodiment,
The same reference numerals are given and detailed description is omitted.

As shown in the figure, the compressors 1 having the same capacity,
The discharge refrigerants 2, 3 and 4 are merged via the discharge pipes 5, 6, 7 and 8 and then split into the circuits of the four-way valve 9 side and the four-way four-way valve side. The valves 25 and 2 enter the indoor coil 28 through the outdoor coil 26, and the compressor suction pipes 13, 14, 1 through the shunt four-way valve 24.
Return to compressors 1, 2, 3, and 4 through 5 and 16. The refrigerant on the four-way valve 9 side enters the indoor coil 27 via the outdoor coil 26 and the compressor suction pipes 13, 14 via the four-way valve 9.
It is configured to pass through 15 and 16 and return to the compressors 1, 2, 3, and 4.

In the above configuration, for example, depending on the installation location of the air conditioner, cooling is performed by the indoor coil 27 incorporated in one air conditioner, and heating is performed by the indoor coil 28 incorporated in the other air conditioner. When the need arises, the refrigerant discharged from the compressors 1, 2, 3, 4 is sent to the outdoor coil 26 through the discharge pipes 5, 6, 7, 8 and the four-way valve 9 and condensed. The refrigerant is sent to the indoor coil 27 for cooling, and then the compressor suction pipes 13, 14, 1,
The refrigerant returns to the compressors 1, 2, 3, 4 via 5, 16.

On the other hand, the high temperature refrigerant discharged from the compressors 1, 2, 3, 4 through the discharge pipes 5, 6, 7, 8 is supplied to the indoor side via the flow dividing four-way valve 24 switched to the dotted line position. The refrigerant is sent to the coil 28 to perform heating, and then the refrigerant returns to the compressors 1, 2, 3, 4 through the outdoor coil 26, the compressor suction pipes 13, 14, 15, 16.

Regarding the switching operation of the compressors 1, 2, 3, 4 and the inverter operation, the first embodiment and the second embodiment will be described.
Since the operation is similar to that of the embodiment, its explanation is omitted.

As described above, according to the heat pump type refrigeration circuit device of the third embodiment of the present invention, the four-way valves 9 and 24 are used for cooling and heating.
Indoor coil 27 by switching independently by
It enables 28 simultaneous cooling and heating operations. In addition, in order to send the heating capacity to the necessary area when the heating capacity is reduced in winter, it is possible to perform the cooling operation at the unnecessary area, prevent the outside coil from frosting, and improve the heating capacity at the necessary area.

[0034]

As is apparent from the above embodiments, according to the present invention, a plurality of compressors having the same capacity are switched and connected via the operation mode changeover switch in the cooling and heating heat pump refrigeration circuit. It is possible to provide a heat pump type refrigeration circuit device capable of switching to a small number of compressors when the load is low and switching to a large number of compressors when the load is high to save power consumption.

Further, since the inverter device is switched and connected to each compressor, continuous operation peculiar to the inverter can be performed.

Further, since the four-way shunt valve is provided and two independent circuits are formed, it is possible to perform the cooling and heating simultaneous operation, and the cooling operation is performed for the unnecessary portion in order to send the heating ability to the required portion when the heating ability is reduced in winter. It is possible to prevent the outdoor unit from being exposed to dew, and improve the heating capacity of a necessary portion.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a configuration of a heat pump type refrigeration circuit device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of a heat pump type refrigeration circuit device of the second embodiment.

FIG. 3 is a circuit diagram showing a configuration of a heat pump type refrigeration circuit device of the third embodiment.

FIG. 4 is a circuit diagram showing a configuration of a conventional heat pump type refrigeration circuit device.

[Explanation of symbols]

 1 Compressor 2 Compressor 3 Compressor 4 Compressor 9 Four-way valve 10 Outdoor coil 12 Indoor coil 18 Operating mode changeover switch 20 Pressure sensor 21 Pressure sensor 22 Control device 23 Inverter device 24 Dividing four-way valve 25 Solenoid valve 26 Outdoor Coil 27 Indoor coil 28 Indoor coil

Claims (3)

[Claims] 1. A plurality of compressors having the same capacity, a pressure sensor for detecting the pressure of an indoor coil and an outdoor coil provided in a refrigeration circuit, and the operation of the compressor based on the detection values of the pressure sensor. A controller for switching modes,
This control device includes an operation mode changeover switch for switching the compressor to an operation circuit for operating a small number or a large number of units, and operates a small number of compressors at a low load and a large number of compressors at a high load. Heat pump type refrigeration circuit device configured. 2. The heat pump type refrigeration circuit device according to claim 1, wherein an inverter device is provided in the middle of an energizing circuit for supplying electric power of a commercial power source to the compressor. 3. A shunt four-way valve provided by dividing the four-way valve provided in the refrigeration circuit, and a solenoid valve provided between the shunt four-way valve and the compressor circuit and controlled by a controller.
An outdoor coil including two circuits provided in each circuit of the four-way valve and the diversion four-way valve and an outdoor coil provided in each circuit of the outdoor coil are provided, and cooling and heating are performed by switching the four-way valve and the diversion four-way valve. The heat pump type refrigeration circuit device according to claim 1, wherein the heat pump type refrigeration circuit device can be operated simultaneously.