JP4055264B2 - Air conditioner - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an air conditioner, and more particularly to a compressor configured as an internal high pressure type during cooling operation and an internal low pressure type during heating operation.
[0002]
[Prior art]
As shown in FIGS. 3A and 3B, for example, an air conditioner that forms a conventional refrigeration cycle includes a compressor 1, a four-way valve 2, an outdoor heat exchanger 3, and an expansion valve (or capillary). Tube) 4 and an indoor heat exchanger 5, which are connected in an annular shape by a refrigerant pipe to constitute a refrigeration cycle.
The compressor 1 has an electric motor 6 and a compression unit 7 disposed in a hermetic container 1a, and the compression unit 7 is meshed with a fixed scroll having a spiral wrap on a not-shown end plate and a turning scroll to form a compression chamber. The discharge chamber 8 for discharging the compressed refrigerant from the discharge port 7a provided in the fixed scroll and the motor chamber 6a for housing the motor 6 are partitioned by the end plate of the fixed scroll, and one side of the motor chamber 6a. Further, one end of a shaft 9 driven by the motor 6 is pivotally supported, and a sub motor chamber 6b defined by a sub bearing 10 provided with a refrigerant flow hole 10a is formed.
[0003]
The refrigerant is circulated in the electric motor chamber 6a to cool the electric motor 6. The internal high-pressure type is used when the refrigerant on the discharge side is circulated to the electric motor 6, and the internal refrigerant is supplied when the refrigerant on the suction side is circulated to the electric motor 6. It is called the low pressure type.
FIG. 3A shows an example of an internal high-pressure compressor (during cooling). Low-pressure refrigerant from the indoor heat exchanger 5 is sucked into a compression chamber (not shown) through a suction pipe 11 and compressed. A high-pressure refrigerant is discharged from the rear discharge port 7a to the discharge chamber 8, and the high-pressure refrigerant is discharged from the discharge pipe 12 to the outside of the container. At the same time, the high-pressure refrigerant flows into the electric motor chamber 6a through the communication passage. To do. The refrigerant discharged from the discharge pipe 12 is circulated by a normal refrigeration cycle to perform a cooling operation.
[0004]
FIG. 3B shows an example of an internal low-pressure compressor (during heating). When the low-pressure refrigerant from the outdoor heat exchanger 3 flows into the electric motor chamber 6a through the suction pipe 11, the internal pressure is reduced. At the same time, the air is sucked into a suction chamber (not shown) of the compression unit 7, discharged from the discharge outlet 7 a after compression to the discharge chamber 8, and discharged from the discharge pipe 12 to the outside of the container.
The refrigerant discharged from the discharge pipe 12 is circulated by a normal refrigeration cycle, and heating operation is performed.
[0005]
In the above configuration, in the case of the internal high-pressure type, the temperature of the sealed container 1a becomes higher than the outside air temperature during the cooling operation, and the heat radiation amount is increased to improve the cooling capacity.
On the contrary, in the case of the internal low pressure type, the temperature of the sealed container 1a becomes close to the outside air temperature during heating operation, and the amount of heat radiation is small and the heating capacity is improved.
However, the internal high-pressure type has a disadvantage that the heating capacity is disadvantageous and the internal low-pressure type has a disadvantage that the cooling capacity is disadvantageous in terms of the amount of heat radiation.
[Problems to be solved by the invention]
In the present invention, in view of the above problems, the first and second refrigerant inlet / outlet pipes are provided on the motor chamber side of the compressor, and the refrigerant is switched to the internal high pressure type during cooling operation by switching the refrigerant flow path of the four-way valve. An object of the present invention is to provide an air conditioner that can be configured as an internal low-pressure type during heating operation.
[0006]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and comprises a refrigerant circuit formed by sequentially connecting a compressor, a four-way valve, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger. ,
In the compressor, an electric motor and a compression unit are arranged in a sealed container, the inside of the sealed container is partitioned into an airtight motor chamber and a discharge chamber, a discharge pipe communicating with the discharge chamber and the outside of the sealed container, and the compression A suction pipe communicating with the outside of the sealed container and a first inlet / outlet pipe and a second inlet / outlet pipe communicating with the outside of the sealed container, the discharge pipe, the suction pipe, and the first The refrigerant circuit is connected to the second inlet / outlet pipe via the four-way valve
During cooling operation, low-pressure refrigerant is sucked into the suction chamber from the suction pipe, and the high-pressure refrigerant compressed by the compression unit is sequentially passed through the discharge chamber, discharge pipe, and four-way valve from the first inlet / outlet pipe to the motor chamber. Inflow, discharged from the second inlet / outlet pipe to the outside of the container, the compressor is an internal high pressure type, and during heating operation, low-pressure refrigerant from the outdoor heat exchanger is sucked into the electric motor from the second inlet / outlet pipe Then, the high-pressure refrigerant compressed in the compression section is sequentially passed through the first inlet / outlet pipe, the four-way valve, and the suction pipe, and is discharged outside the container through the discharge chamber and the discharge pipe, thereby forming the compressor as an internal low-pressure type. It has a configuration.
[0007]
The four-way valve is installed in the vicinity of the discharge chamber or in the vicinity of the first inlet / outlet pipe.
[0008]
In addition, the four-way valve is integrated with the compressor.
[0009]
Further, the suction pipe is provided on the discharge pipe side.
[0010]
In addition, the electric motor chamber is partitioned by a sub-bearing that supports a shaft driven by the electric motor to form a sub electric motor chamber, and the second inlet / outlet pipe is provided on the sub electric motor chamber side.
[0011]
Further, the second inlet / outlet pipe is provided on the side opposite to the auxiliary bearing.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
1 (A) and 1 (B), 1 is a compressor, 2 is a four-way valve that switches the flow of refrigerant discharged from the compressor 1 in accordance with heating operation, cooling operation, etc., 3 is an outdoor heat exchanger, 4 Are expansion valves, 5 is an indoor heat exchanger, and these are connected in an annular shape by refrigerant piping to form a refrigerant circuit.
[0013]
The compressor 1 has an electric motor 6 and a compression unit 7 disposed in a hermetic container 1a, and the compression unit 7 is meshed with a fixed scroll having a spiral wrap on a not-shown end plate and a turning scroll to form a compression chamber. The airtight discharge chamber 8 from which the compressed refrigerant is discharged from the discharge port 7a provided in the fixed scroll and the airtight motor chamber 6a that houses the electric motor 6 are partitioned by the end plate of the fixed scroll, and the electric motor chamber One side of the shaft 6a driven by the motor 6 is pivotally supported on one side, and a sub motor chamber 6b defined by a sub bearing 10 provided with a refrigerant flow hole 10a is formed.
[0014]
A suction pipe 11 for sucking low-pressure refrigerant into the compression chamber in the compression section 7 is provided on one side of the sealed container 1a, and an inlet side of the suction pipe 11 and a low-pressure outlet 2a of the four-way valve 2 are connected by piping. A discharge pipe 12 for discharging high-pressure refrigerant from the discharge chamber 8 to the outside of the container is provided on the surface of the closed container 1a opposite to the back surface 7b of the fixed scroll of the compression section 7, and the outlet side of the discharge pipe 12 and the four sides A high-pressure inlet 2b of the valve 2 is connected by piping, and a first inlet / outlet pipe 13 serving as a refrigerant flow path connecting the outside of the container and the electric motor chamber 6a is provided on one side of the sealed container 1a. The first through hole 2c of the four-way valve 2 is connected by piping, and a second inlet / outlet pipe 14 serving as a refrigerant flow path connecting the outside of the container and the auxiliary motor chamber 6b is provided on one side of the sealed container 1a. The inlet / outlet pipe 14 and the outlet side during heating of the outdoor heat exchanger 3 are connected by piping, and the second through hole 2d of the four-way valve 2 and the indoor heat exchanger 5 are heated. And it has a configuration that the pipe connecting the inlet side of the time.
[0015]
In the above configuration, the refrigerant circulates as shown by the solid line arrows in FIG. 1A during the cooling operation and in FIG. 1B during the heating operation.
During the cooling operation, the high-temperature and high-pressure gas refrigerant discharged from the discharge chamber 8 via the discharge pipe 12 passes through the high-pressure inlet 2b and the first through-hole 2c of the four-way valve 2, and then the electric motor from the first inlet / outlet pipe 13 The air flows into the chamber 6a and is discharged from the second inlet / outlet pipe 14 to the outside with a high pressure inside the compressor 1, and heat is exchanged with the outdoor air while flowing through the outdoor heat exchanger 3, thereby releasing heat to the outdoor. Then it condenses and liquefies.
The condensed and liquefied liquid refrigerant is depressurized through the expansion valve 4 to become a low-temperature and low-pressure gas-liquid two-phase, evaporates by absorbing heat from the indoor air while flowing through the indoor heat exchanger 5, and low-temperature and low-pressure gas. After becoming a refrigerant and passing through the second through hole 2d and the low pressure outlet 2a of the four-way valve 2, it is returned to the compression section 7 through the suction pipe 11.
[0016]
During the heating operation, the high-temperature and high-pressure gas refrigerant discharged from the discharge chamber 8 through the discharge pipe 12 passes through the high-pressure inlet 2b and the second through-hole 2d of the four-way valve 2, and then the indoor heat exchanger 5; After passing through the expansion valve 4 and the outdoor heat exchanger 3, low-pressure gas refrigerant is sucked into the auxiliary motor chamber 6b and the motor chamber 6a from the second inlet / outlet pipe 14 to make the inside of the compressor 1 low in pressure and enter the first inlet / outlet. After being discharged out of the container from the pipe 13 and passing through the first through hole 2c and the low pressure outlet 2a of the four-way valve 2, it is returned to the compression section 7 through the suction pipe 11.
[0017]
As described above, the compressor 1 is provided with the first and second inlet / outlet pipes 13 and 14 on the side of the motor chamber 6a and the sub motor chamber 6b of the compressor 1 and switching the refrigerant flow path of the four-way valve 2. By configuring the interior to be an internal high-pressure type during cooling operation and an internal low-pressure type during heating operation, the temperature of the sealed container becomes higher than the outside air temperature during cooling operation, increasing the heat dissipation and improving the cooling capacity, Also, at the start of heating operation, the refrigerant that has accumulated in the compression chamber at the time of stoppage is simultaneously sucked in, compressed, and discharged at the same time as starting, so it is advantageous to increase the discharge temperature from the start and ensure the amount of refrigerant circulation. Sometimes it becomes an air conditioner that can improve the heating capacity by reducing the amount of heat radiation.
[0018]
As shown in FIG. 2, the four-way valve 2 and the compressor 1 may be integrated.
The suction pipe may be provided on the discharge pipe side.
Moreover, it is good also as a structure which provided said 2nd entrance / exit pipe | tube in the side opposite to the said auxiliary bearing.
[0019]
【The invention's effect】
As described above, according to the present invention, the first and second inlet / outlet pipes are provided on the compressor motor chamber side and the sub motor chamber side, respectively, and the inside of the compressor is cooled by switching the refrigerant flow path of the four-way valve. By configuring the internal high pressure type at times and the internal low pressure type during heating operation, the temperature of the sealed container becomes higher than the outside air temperature during cooling operation, the amount of heat radiation is increased, and the cooling capacity is improved. When starting up, the refrigerant that has accumulated in the compression chamber at the time of stoppage is simultaneously sucked in, compressed, and discharged at the same time as starting.Therefore, it is advantageous to increase the discharge temperature from starting and to secure the amount of refrigerant circulation. It becomes an air conditioning apparatus which can improve a heating capability by reduction.
[Brief description of the drawings]
FIG. 1 is a diagram showing an embodiment of a refrigeration cycle of an air conditioner according to the present invention, where (A) is an internal high-pressure type (during cooling operation) and (B) is an internal low-pressure type (during heating operation).
2A and 2B are configuration diagrams in which a four-way valve according to the present invention is integrated with a compressor. FIG. 2A is an internal high-pressure type (during cooling operation), and FIG. 2B is an internal low-pressure type (during heating operation).
FIGS. 3A and 3B are diagrams showing a refrigeration cycle of an air conditioner according to a conventional example, in which FIG. 3A is an internal high pressure type (during cooling operation), and FIG. 3B is an internal low pressure type (during heating operation).
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Compressor 2 Four way valve 3 Outdoor heat exchanger 4 Expansion valve 5 Indoor heat exchanger 6 Electric motor
6a Motor room
6b Sub motor room 7 Compression section
7a Discharge port 8 Discharge chamber 9 Shaft
10 Secondary bearing
11 Suction pipe
12 Discharge pipe
13 First access pipe
14 Second access pipe

Claims (6)

A compressor, a four-way valve, an outdoor heat exchanger, an expansion valve, and an indoor heat exchanger are sequentially connected to form a refrigerant circuit,
The compressor arranges an electric motor and a compression unit in a sealed container, divides the inside of the sealed container into an airtight motor room and a discharge chamber, a discharge pipe communicating with the discharge chamber and the outside of the sealed container, A suction pipe that communicates the suction chamber of the compression unit and the outside of the sealed container is provided, and a first inlet / outlet pipe and a second inlet / outlet pipe that communicate the outside of the motor container and the sealed container are provided, the discharge pipe, the suction pipe, and the first The first and second inlet / outlet pipes are connected to the refrigerant circuit via the four-way valves,
During cooling operation, low-pressure refrigerant is sucked into the suction chamber from the suction pipe, and the high-pressure refrigerant compressed by the compression unit is sequentially passed through the discharge chamber, discharge pipe, and four-way valve from the first inlet / outlet pipe to the motor chamber. Inflow, discharged from the second inlet / outlet pipe to the outside of the container, the compressor is an internal high pressure type, and during heating operation, low-pressure refrigerant from the outdoor heat exchanger is sucked into the electric motor from the second inlet / outlet pipe Then, the high-pressure refrigerant compressed in the compression section is sequentially passed through the first inlet / outlet pipe, the four-way valve, and the suction pipe, and is discharged to the outside of the container through the discharge chamber and the discharge pipe. An air conditioner characterized by comprising: The air conditioner according to claim 1, wherein the four-way valve is installed in the vicinity of the discharge chamber or in the vicinity of the first inlet / outlet pipe. The air conditioner according to claim 1, wherein the four-way valve is integrated with the compressor. The air conditioner according to claim 1, wherein the suction pipe is provided on the discharge pipe side. The motor room is defined by a sub-bearing that supports a shaft driven by the motor to form a sub motor room, and the second inlet / outlet pipe is provided on the side of the sub motor room. The air conditioning apparatus according to 1. The air conditioner according to claim 1 or 5, wherein the second inlet / outlet pipe is provided on a side facing the auxiliary bearing.

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