JP2007051824A - Air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air-conditioner that provides high reliability even when outside temperature is low. <P>SOLUTION: An outdoor unit 20 has disposed therein a compressor 1, a four-way valve 2, a decompressor 4, an outdoor heat exchanger 5, a second bypass circuit 9, a two-way valve 10 and an outdoor fan 19. An indoor unit 18 has disposed therein an indoor heat exchanger 3 and an indoor fan 17. At the start of the compressor 1 a bypass operation in which the two-way valve 10 of the second bypass circuit 9 is opened to allow refrigerant to pass through the outdoor heat exchanger 5 is performed whereby even if outside temperature is particularly low, refrigerant pressure on the suction side of the compressor 1 can be prevented from decreasing. The state of negative pressure where the refrigerant pressure on the suction side of the compressor 1 is lower than the atmospheric pressure can be prevented from occurring. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air conditioner capable of performing a heating operation by a heat pump operation.

Conventionally, this type of heat pump type air conditioner compressor start-up system is operated by a compressor having a variable operating frequency and a frequency variable means capable of increasing the operating frequency at a predetermined speed when the compressor is started. The driving system controls the frequency and the predetermined frequency increase speed can be changed (for example, see Patent Document 1).
JP-A-10-227534 (FIG. 6)

  However, in this compressor start-up method, the refrigerant in the refrigeration cycle on the suction side of the outdoor heat exchanger and the compressor is in a deficient state particularly when the compressor is started in the heating operation when the outdoor temperature is low, and in some cases There is a case where the refrigerant pressure on the suction side of the compressor is in a negative pressure state lower than the atmospheric pressure. Thus, when the suction side of the compressor is in a negative pressure state, the compressor operates abnormally, and the refrigerant circulation amount becomes extremely small, so that the circulation amount of the refrigerating machine oil also decreases, and the lubrication performance of the sliding portion in the compressor As a result, the life of the sliding portion of the compressor is reduced.

  The present invention solves the above-described conventional problems, and prevents the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor is lower than the atmospheric pressure even when the outdoor temperature is low, and An object of the present invention is to provide a highly reliable air-conditioning apparatus without reducing its lifetime.

  In order to solve the above conventional problems, an air conditioner of the present invention includes a heat pump refrigeration cycle in which a compressor, a four-way valve, an indoor heat exchanger, a decompressor, and an outdoor heat exchanger are connected by a refrigerant circuit, and the refrigeration Between the four-way valve and the indoor heat exchanger connected to a cycle, between the pressure reducer and the outdoor heat exchanger, or between the compressor and the four-way valve connected to the refrigeration cycle, A bypass circuit for connecting between the pressure reducer and the outdoor heat exchanger is provided, a two-way valve is provided in the bypass circuit, and the two-way valve of the bypass circuit is opened when the compressor is started, so that the outdoor heat exchanger is provided. The bypass operation is performed to allow the refrigerant to pass through.

  This prevents the occurrence of a negative pressure state where the refrigerant pressure on the suction side of the compressor is lower than the atmospheric pressure even when the outdoor temperature is low.

  In addition, the air conditioner of the present invention includes a first bypass circuit that connects between the indoor heat exchanger and the decompressor connected to the refrigeration cycle, and between the four-way valve and the outdoor heat exchanger. Further, between the four-way valve connected to the refrigeration cycle and the indoor heat exchanger, between the pressure reducer and the outdoor heat exchanger, or between the compressor and the four-way valve connected to the refrigeration cycle. And a second bypass circuit that connects between the decompressor and the outdoor heat exchanger, a two-way valve is provided in the first bypass circuit, and the first bypass is provided when the compressor is started. A first bypass operation in which the two-way valve of the circuit is opened and the refrigerant flows to the suction side of the compressor; and the two-way valve of the second bypass circuit is opened and the refrigerant passes through the outdoor heat exchanger. The second bypass operation is performed.

  As a result, even when the outdoor temperature is low, it is possible to prevent the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor is lower than the atmospheric pressure, and the reliability of the air conditioner without reducing the life of the compressor. Is to improve.

  The air conditioner of the present invention can improve the reliability of the compressor mounted on the air conditioner.

  A first invention includes a heat pump refrigeration cycle in which a compressor, a four-way valve, an indoor heat exchanger, a decompressor, and an outdoor heat exchanger are connected by a refrigerant circuit, and the four-way valve and the indoor heat connected to the refrigeration cycle. Connecting between the exchangers, between the pressure reducer and the outdoor heat exchanger, or between the compressor and the four-way valve connected to the refrigeration cycle, and between the pressure reducer and the outdoor heat exchanger By providing a bypass circuit, providing a two-way valve in the bypass circuit, opening the two-way valve of the bypass circuit when starting the compressor, and performing a bypass operation of allowing the refrigerant to pass through the outdoor heat exchanger, Especially when the outdoor temperature is low, it is possible to prevent a decrease in refrigerant pressure on the suction side of the compressor, and to prevent the occurrence of a negative pressure state where the refrigerant pressure on the suction side of the compressor is lower than the atmospheric pressure. Can do.

  According to a second aspect of the present invention, there is provided a bypass circuit that connects between the indoor heat exchanger and the pressure reducer connected to the refrigeration cycle, and between the four-way valve and the outdoor heat exchanger. By providing a valve and performing a bypass operation of opening the two-way valve of the bypass circuit and flowing the refrigerant to the suction side of the compressor when the compressor is started up, even when the outdoor temperature is low, It is possible to prevent the refrigerant pressure on the side from decreasing, and it is possible to prevent the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor is lower than the atmospheric pressure.

  3rd invention provides the 1st bypass circuit which connects between the said indoor heat exchanger connected to the said refrigerating cycle, the said pressure reduction device, and between the said four-way valve, and the said outdoor heat exchanger, Furthermore, the said freezing Between the four-way valve and the indoor heat exchanger connected to a cycle, between the pressure reducer and the outdoor heat exchanger, or between the compressor and the four-way valve connected to the refrigeration cycle, A second bypass circuit connecting between the pressure reducer and the outdoor heat exchanger is provided, a two-way valve is provided in the first bypass circuit, and the two directions of the first bypass circuit are provided when the compressor is started. A first bypass operation in which the valve is opened and the refrigerant flows to the suction side of the compressor; and a second bypass in which the two-way valve of the second bypass circuit is opened and the refrigerant is passed through the outdoor heat exchanger. By operating, especially when the outdoor temperature is low Possible to prevent a decrease in the refrigerant pressure on the suction side of the compressor becomes, the refrigerant pressure in the suction side of the compressor is lower than the atmospheric pressure, it is possible to prevent the occurrence of negative pressure.

  In particular, the fourth invention is a bypass that connects between the indoor heat exchanger and the decompressor connected to the refrigeration cycle of the second or third invention, and between the four-way valve and the outdoor heat exchanger. By providing a two-way valve and a refrigerant heater in the circuit, it is possible to prevent a decrease in refrigerant pressure on the suction side of the compressor even when the outdoor temperature is low, and the refrigerant pressure on the suction side of the compressor is reduced. Occurrence of a negative pressure state lower than atmospheric pressure can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a configuration diagram of an air-conditioning apparatus according to a first embodiment of the present invention. In FIG. 1, an outdoor unit 20 includes a compressor 1, a four-way valve 2, a decompressor 4, an outdoor heat exchanger 5, a second
The bypass circuit 9, the two-way valve 10, and the outdoor blower 19 are provided. The indoor unit 18 is provided with the indoor heat exchanger 3 and the indoor blower 17. Here, the decompressor 4 may be an electromagnetic expansion valve.

  About the air conditioning apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, when the compressor 1 is started, a bypass operation is performed in which the two-way valve 10 of the second bypass circuit 9 is opened and the refrigerant passes through the outdoor heat exchanger 5.

  In the present embodiment, when the compressor 1 is started, the outdoor temperature is particularly low by performing a bypass operation in which the two-way valve 10 of the second bypass circuit 9 is opened and the refrigerant is passed through the outdoor heat exchanger 5. Even in this case, it is possible to prevent a decrease in the refrigerant pressure on the suction side of the compressor 1, and it is possible to prevent the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor 1 is lower than the atmospheric pressure.

  Note that the opening time of the two-way valve 10 may be sufficient to prevent the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor 1 is lower than the atmospheric pressure.

(Embodiment 2)
FIG. 2 shows a configuration diagram of an air-conditioning apparatus according to the second embodiment of the present invention. In FIG. 2, a first bypass circuit 6 that connects between the indoor heat exchanger 3 and the pressure reducer 4, and between the four-way valve 2 and the outdoor heat exchanger 5 is provided, and the two-way valve 7 is provided in the first bypass circuit 6. Is provided.

  About the air conditioning apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  When the compressor 1 is started, a bypass operation is performed in which the two-way valve 7 of the first bypass circuit 6 is opened and the refrigerant flows to the suction side of the compressor 1.

  As described above, in the present embodiment, by performing the bypass operation of opening the two-way valve 7 of the first bypass circuit 6 and flowing the refrigerant to the suction side of the compressor 1 at the time of starting the compressor 1, Especially when the outdoor temperature is low, it is possible to prevent a decrease in refrigerant pressure on the suction side of the compressor, and to prevent the occurrence of a negative pressure state where the refrigerant pressure on the suction side of the compressor is lower than the atmospheric pressure. Can do.

  Note that the opening time of the two-way valve 7 may be sufficient to prevent the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor 1 is lower than the atmospheric pressure.

(Embodiment 3)
FIG. 3 shows a configuration diagram of an air-conditioning apparatus according to the third embodiment of the present invention. In FIG. 3, the 1st bypass circuit 6 which connects between the indoor heat exchanger 3 and the decompressor 4, and between the four-way valve 2 and the outdoor heat exchanger 5 is provided, and also the four-way valve 2 and the indoor heat exchanger 3 are connected. A second bypass circuit 9 that connects between the pressure reducer 4 and the outdoor heat exchanger 5, or between the compressor 1 and the four-way valve 2, and between the pressure reducer 4 and the outdoor heat exchanger 5, A first bypass circuit 6 is provided with a two-way valve 7, and when the compressor 1 is started, the two-way valve 7 of the first bypass circuit 6 is opened to allow the refrigerant to flow to the suction side of the compressor 1. The operation and the second bypass operation of opening the two-way valve 10 of the second bypass circuit 9 and allowing the refrigerant to pass through the outdoor heat exchanger 5 are performed.

As described above, in the present embodiment, when the compressor 1 is started, the bypass operation in which the two-way valve 7 of the first bypass circuit 6 is opened and the refrigerant flows to the suction side of the compressor 1 and the second bypass are performed. By performing the second bypass operation in which the two-way valve 10 of the circuit 9 is opened and the refrigerant is allowed to pass through the outdoor heat exchanger 5, the refrigerant pressure on the suction side of the compressor is reduced even when the outdoor temperature is low. It is possible to prevent the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor is lower than the atmospheric pressure.

  The two-way valves 7 and 10 need only be opened for a sufficient time to prevent the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor 1 is lower than the atmospheric pressure.

(Embodiment 4)
FIG. 4 shows a configuration diagram of an air-conditioning apparatus according to the fourth embodiment of the present invention. In FIG. 4, the outdoor unit 20 includes a compressor 1, a four-way valve 2, a decompressor 4, an outdoor heat exchanger 5, a first bypass circuit 6, a two-way valve 7, a refrigerant heater 8, and a second bypass. A circuit 9 and a two-way valve 10 are provided.

  The decompressor 4 here may be an electromagnetic expansion valve. In such a configuration, when the compressor 1 is started, the first bypass operation of opening the two-way valve 7 of the first bypass circuit 6 and flowing the refrigerant to the suction side of the compressor 1, and the second bypass circuit 9 A second bypass operation is performed in which the two-way valve 10 is opened and the refrigerant passes through the outdoor heat exchanger 5.

  As described above, in the present embodiment, when the compressor 1 is started, the bypass operation in which the two-way valve 7 of the first bypass circuit 6 is opened and the refrigerant flows to the suction side of the compressor 1 and the second bypass are performed. By performing the second bypass operation in which the two-way valve 10 of the circuit 9 is opened and the refrigerant is allowed to pass through the outdoor heat exchanger 5, the refrigerant pressure on the suction side of the compressor is reduced even when the outdoor temperature is low. It is possible to prevent the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor is lower than the atmospheric pressure.

  The two-way valves 7 and 10 need only be opened for a sufficient time to prevent the occurrence of a negative pressure state in which the refrigerant pressure on the suction side of the compressor 1 is lower than the atmospheric pressure.

  As described above, the air conditioner of the present invention prevents the occurrence of a negative pressure state in which the pressure of the refrigerant on the suction side of the compressor is lower than the atmospheric pressure even when the outdoor temperature is low, and the sliding portion of the compressor, etc. This improves the reliability of the air conditioner without deteriorating the service life of the air conditioner. Therefore, the present invention can be applied to an air conditioner used particularly in cold regions.

The block diagram of the air conditioning apparatus in Embodiment 1 of this invention The block diagram of the air conditioning apparatus in Embodiment 2 of this invention The block diagram of the air conditioning apparatus in Embodiment 3 of this invention The block diagram of the air conditioning apparatus in Embodiment 4 of this invention Configuration diagram of conventional air conditioner

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Indoor heat exchanger 4 Pressure reducer 5 Outdoor heat exchanger 6 1st bypass circuit 7, 10 Two-way valve 8 Heater 9 2nd bypass circuit 11, 12 Pressure reducer 13 Heater heater 14 Refrigerant passage pipe part 15 Heat storage part 17 Indoor fan 18 Indoor unit 19 Outdoor fan 20 Outdoor unit

Claims (4)

A heat pump refrigeration cycle in which a compressor, a four-way valve, an indoor heat exchanger, a decompressor, and an outdoor heat exchanger are connected by a refrigerant circuit; and between the four-way valve and the indoor heat exchanger connected to the refrigeration cycle, A bypass circuit is provided between the decompressor and the outdoor heat exchanger, or between the compressor and the four-way valve connected to the refrigeration cycle, and between the decompressor and the outdoor heat exchanger, An air conditioner that performs a bypass operation of providing a two-way valve in the bypass circuit and opening the two-way valve of the bypass circuit to allow the refrigerant to pass through the outdoor heat exchanger when the compressor is started. Compressor, four-way valve, indoor heat exchanger, decompressor, outdoor heat exchanger connected by a refrigerant circuit between the indoor heat exchanger and the decompressor connected to the heat pump refrigeration cycle, and the four-way valve and the outdoor A bypass circuit connecting between the heat exchangers is provided, a two-way valve is provided in the bypass circuit, and the two-way valve of the bypass circuit is opened when the compressor is started to flow the refrigerant to the suction side of the compressor An air conditioner that performs a bypass operation. Compressor, four-way valve, indoor heat exchanger, decompressor, outdoor heat exchanger connected by a refrigerant circuit between the indoor heat exchanger and the decompressor connected to the heat pump refrigeration cycle, and the four-way valve and the outdoor A first bypass circuit connecting between the heat exchangers, and further between the four-way valve and the indoor heat exchanger connected to the refrigeration cycle, between the pressure reducer and the outdoor heat exchanger, or A second bypass circuit is provided between the compressor and the four-way valve connected to the refrigeration cycle, and between the pressure reducer and the outdoor heat exchanger, and the two-way valve is provided in the first bypass circuit. A first bypass operation in which the two-way valve of the first bypass circuit is opened and the refrigerant flows to the suction side of the compressor when the compressor is started, and two ways of the second bypass circuit Open the valve and pass the refrigerant through the outdoor heat exchanger An air conditioning apparatus and performing a second bypass operation for. The air conditioner according to claim 2 or 3, wherein a two-way valve and a refrigerant heater are provided in the first bypass circuit.

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