JP2018179353A - Refrigeration cycle device, rotary compressor - Google Patents

Abstract

A refrigerant in a compression chamber is prevented from flowing back into a refrigeration cycle through an injection flow path. One end is connected to a refrigeration cycle apparatus 100 other than the rotary compressor 111, the other end is connected to the rotary compressor 111, and an injection pipe 116 for supplying an injection refrigerant to the rotary compressor 11 is provided. 111 includes an injection flow path 128 whose one end communicates with the injection pipe 116 and the other end communicates with the compression chamber 129, and the injection pipe 116 or the injection flow path 128 includes a valve 117 for adjusting the flow of the refrigerant. [Selection] Figure 1

Description

  The present invention relates to a refrigeration cycle apparatus and a rotary compressor.

Conventionally, a rotary compressor having an injection flow path communicating with the inside of a cylinder and having a mechanism that opens and closes the injection flow path by rotation of a piston has been proposed and used for air conditioning (see Patent Document 1).
The cross-sectional view of the compression mechanism part of the rotary compressor of patent document 1 is shown in FIG. The rotary compressor is provided with an injection flow passage 12 communicating with the inside of the cylinder 11, and the injection flow passage 12 is configured to be opened and closed by the end surface of the piston 13 by the rotation of the piston 13.
As a result, while the injection flow passage 12 is in communication with the inside of the cylinder 11, it is possible to supply the injection refrigerant at an intermediate pressure from the injection flow passage 12 to the compression chamber 14.

JP 2000-170678 A

In the configuration described in the prior art, when the compression ratio decreases in the cooling operation, the refrigerant pressure in the compression chamber 14 is set to the pressure of the injection refrigerant at the intermediate pressure with the injection flow passage 12 communicating with the inside of the cylinder 11. The refrigerant in the compression chamber 14 flows back to the refrigeration cycle through the injection flow passage 12.
Therefore, the refrigerant in the superheated gas state compressed from the suction pressure to the pressure of the injection refrigerant is discharged to the refrigeration cycle and the refrigeration effect is reduced, so that the efficiency of the refrigeration cycle is reduced.
The present invention is to solve the above-mentioned problems, and it is an object of the present invention to prevent the refrigerant in the compression chamber 14 from flowing back to the refrigeration cycle through the injection channel 12.

In order to solve the above problems, the present invention relates to a rotary compressor for compressing a refrigerant by a piston rotating inside a compression chamber, a four-way valve, an outdoor heat exchanger, an outdoor adjustment means, and an indoor heat exchanger And one end is connected to the refrigeration cycle other than the rotary compressor, and the other end is connected to the rotary compressor, and includes an injection pipe for supplying an injection refrigerant to the rotary compressor, The rotary compressor includes an injection flow passage having one end communicating with the injection pipe and the other end communicating with the compression chamber, and the injection pipe or the injection flow path being provided with a valve for adjusting the flow of the refrigerant. It features.
During the cooling operation, the compression ratio is smaller compared to the heating operation, and the piston rotation angle until the compression chamber pressure reaches the injection pressure is smaller. Therefore, the compression chamber pressure is maintained with the other end of the injection channel open May reach the injection pressure, but in this configuration, by closing the on-off valve during the cooling operation, the compression chamber pressure reaches the injection pressure with the other end of the injection channel open during the cooling operation. However, the refrigeration cycle and the inside of the compression chamber do not communicate at the other end of the injection flow channel.

In the present invention, when the pressure in the compression chamber reaches the injection pressure with the other end of the injection flow channel open during cooling operation, the refrigerant in the compression chamber does not flow back to the refrigeration cycle through the other end of the injection flow channel.
Therefore, since the refrigerant compressed from the suction pressure to the injection pressure is suppressed from being discharged into the refrigeration cycle, the refrigerant in the superheated gas state compressed from the suction pressure to the injection pressure is discharged to the refrigeration cycle, and the refrigeration effect is reduced. The efficiency of the refrigeration cycle is improved.

Refrigerating cycle configuration diagram according to the first embodiment of the present invention A cross-sectional view of a compression mechanism portion of a rotary compressor according to a first embodiment of the present invention A longitudinal sectional view of a compression mechanism portion of a rotary compressor according to a first embodiment of the present invention Refrigeration cycle configuration diagram according to Embodiment 2 of the present invention A cross-sectional view of a compression mechanism portion of a rotary compressor according to a second embodiment of the present invention The longitudinal cross-sectional view of the compression mechanism part of the rotary compressor in Embodiment 2 of this invention A cross-sectional view of a compression mechanism portion of a rotary compressor described in Patent Document 1

  According to a first aspect of the present invention, there is provided a refrigeration cycle apparatus including a rotary compressor for compressing a refrigerant by a piston rotating inside a compression chamber, a four-way valve, an outdoor heat exchanger, an outdoor adjustment means, and an indoor heat exchanger. And an injection pipe connected at one end to the refrigeration cycle other than the rotary compressor, at the other end to the rotary compressor, and supplying the injection refrigerant to the rotary compressor. A refrigeration cycle apparatus comprising: an injection channel communicating with the injection pipe and the other end communicating with the compression chamber; and a valve for adjusting the flow of refrigerant in the injection pipe or the injection channel. It is.

As a result, during the cooling operation, the compression ratio is smaller compared to the heating operation, and the piston rotation angle until the compression chamber pressure reaches the injection pressure is smaller, so the other end of the injection flow path is open. The pressure in the compression chamber may reach the injection pressure. However, in this configuration, by closing the valve during the cooling operation, the pressure in the compression chamber is in the state where the other end of the injection channel is open during the cooling operation. Even when the injection pressure is reached, the refrigeration cycle and the inside of the compression chamber do not communicate at the other end of the injection flow channel.
Therefore, in the refrigeration cycle apparatus of the present invention, when the pressure in the compression chamber reaches the injection pressure with the other end of the injection flow passage open during the cooling operation, the refrigerant in the compression chamber passes through the other end of the injection flow passage. Do not flow back into the refrigeration cycle. Therefore, since the refrigerant compressed from the suction pressure to the injection pressure is suppressed from being discharged into the refrigeration cycle, the refrigerant in the superheated gas state compressed from the suction pressure to the injection pressure is discharged to the refrigeration cycle, and the refrigeration effect is reduced. Control the efficiency of the refrigeration cycle.

  A second invention is the refrigeration cycle apparatus according to the first invention, wherein the valve is provided in the injection flow path.

As a result, by providing the valve inside the compressor, when the valve is closed, the refrigerant flows back to the injection pipe even if the compression chamber pressure reaches the injection pressure when the other end of the injection flow path is open. do not do.
Therefore, in the refrigeration cycle apparatus of the present invention, when the pressure in the compression chamber reaches the injection pressure in the cooling operation with the other end of the injection flow path open, the refrigerant in the compression chamber is the other end of the injection flow path Do not flow back into the injection piping through Therefore, since the refrigerant compressed from the suction pressure to the injection pressure is suppressed from being discharged to the injection pipe, the refrigerant compressed from the suction pressure to the injection pressure is discharged to the injection pipe, and then returned to the compression chamber and reexpanded. Since the increase in the compressor work is suppressed, the re-expansion and re-compression of the injection pipe volume can be suppressed and the compressor can be operated at a high efficiency, so the efficiency of the refrigeration cycle is improved.

  A third aspect of the present invention is the refrigeration cycle apparatus according to the second aspect, further comprising: a refrigerant outlet pipe communicating with the valve from the refrigerant pipe between the four-way valve and the outdoor adjustment means, wherein the valve is in the refrigerant outlet pipe It is a refrigerating cycle device characterized by operating by refrigerant pressure.

The vicinity of the other end of the injection channel is exposed to high temperature because it is close to the sliding portion of the compression chamber, and the space for arranging the on-off valve is small. However, the refrigeration cycle apparatus of the present invention electrically operates for valve operation of the valve. Since no actuator is used, a small valve with excellent heat resistance can be installed in the vicinity of the other end of the injection channel inside the injection channel. Further, during heating operation, the inside of the on-off valve operating refrigerant extraction pipe becomes a low pressure refrigerant pressure reduced by the pressure control valve, and the valve is opened. During cooling operation, the on-off valve operating refrigerant extraction pipe The interior is closed by the high pressure refrigerant pressure before being reduced by the pressure control valve.
Therefore, in the refrigeration cycle apparatus of the present invention, the sliding load is high at the time of cooling rated operation and the like, and the high pressure refrigerant in the refrigerant extraction pipe for opening and closing the valve even if the valve is exposed to the high temperature portion near the sliding portion Since the valve is closed by the pressure, when the pressure in the compression chamber reaches the injection pressure when the other end of the injection channel is open, the refrigerant in the compression chamber does not backflow to the injection pipe through the other end of the injection channel . Therefore, even when the temperature in the vicinity of the sliding portion becomes high during cooling rated operation, etc., recompression and expansion due to the backflow of the refrigerant to the injection pipe are suppressed, and the compressor can be operated at high efficiency. Efficiency is improved.

  A fourth invention relates to a rotary compressor for compressing a refrigerant by a piston rotating inside a compression chamber, wherein one end is connected to the refrigeration cycle other than the rotary compressor and the other end is connected to the rotary compressor. The rotary compressor includes an injection flow passage communicating with the other end of the pipe and communicating with the compression chamber, and the injection flow passage includes a valve for adjusting the flow of the refrigerant.

As a result, by providing the valve inside the compressor, when the valve is closed, the refrigerant flows back to the injection pipe even if the compression chamber pressure reaches the injection pressure when the other end of the injection flow path is open. do not do.
Therefore, in the rotary compressor of the present invention, when the pressure in the compression chamber reaches the injection pressure in the cooling operation with the other end of the injection flow passage open, the refrigerant in the compression chamber is the other end of the injection flow passage. Do not flow back into the injection piping through Therefore, since the refrigerant compressed from the suction pressure to the injection pressure is suppressed from being discharged to the injection pipe, the refrigerant compressed from the suction pressure to the injection pressure is discharged to the injection pipe, and then returned to the compression chamber and reexpanded. Since the increase in the compressor work is suppressed, the re-expansion and re-compression of the injection pipe volume can be suppressed and the compressor can be operated at a high efficiency, so the efficiency of the refrigeration cycle is improved.

  A fifth aspect of the invention is the rotary compressor according to the fourth aspect of the invention, wherein the pressure of the refrigerant in the refrigerant discharge pipe communicating with the valve from the refrigerant pipe between the four-way valve provided in the refrigeration cycle and the outdoor adjustment means Is a rotary compressor characterized in that it operates.

The vicinity of the other end of the injection channel is exposed to high temperature because it is close to the sliding portion of the compression chamber, and the space for arranging the on-off valve is small. However, the refrigeration cycle apparatus of the present invention electrically operates for valve operation of the valve. Since no actuator is used, a small valve with excellent heat resistance can be installed in the vicinity of the other end of the injection channel inside the injection channel. Further, during heating operation, the inside of the on-off valve operating refrigerant extraction pipe becomes a low pressure refrigerant pressure reduced by the pressure control valve, and the valve is opened. During cooling operation, the on-off valve operating refrigerant extraction pipe The interior is closed by the high pressure refrigerant pressure before being reduced by the pressure control valve.
Therefore, in the rotary compressor of the present invention, the sliding load is high at the time of cooling rated operation and the like, and the high pressure refrigerant in the refrigerant extraction pipe for opening and closing the valve even if the valve is exposed to the high temperature portion near the sliding portion. Since the valve is closed by the pressure, when the pressure in the compression chamber reaches the injection pressure when the other end of the injection channel is open, the refrigerant in the compression chamber does not backflow to the injection pipe through the other end of the injection channel . Therefore, even when the temperature in the vicinity of the sliding portion becomes high during cooling rated operation, etc., recompression and expansion due to the backflow of the refrigerant to the injection pipe are suppressed, and the compressor can be operated at high efficiency. Efficiency is improved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by this embodiment.

Embodiment 1
FIG. 1 shows a configuration diagram of a refrigeration cycle apparatus 100 according to Embodiment 1 of the present invention. The refrigeration cycle apparatus 100 of FIG. 1 includes one outdoor unit 101, and one indoor unit 102 is connected to the outdoor unit 101. The refrigeration cycle configuration is not limited to that shown in FIG. For example, two or more outdoor units 101 and two or more indoor units 102 can be connected in parallel.

The refrigeration cycle apparatus 100 includes an outdoor unit 101 and an indoor unit 102.
The outdoor unit 101 includes a rotary compressor 111 that compresses a refrigerant. A discharge pipe 150 is provided on the discharge side of the rotary compressor 111. The discharge pipe 150 is connected to a first refrigerant pipe (a refrigerant pipe between the four-way valve and the outdoor adjustment means) 151 via the four-way valve 112. The four-way valve 112 switches the refrigerant flow direction during the cooling operation and the heating operation. During the heating operation, the refrigerant flows along the solid line of the four-way valve 112, and during the cooling operation, the refrigerant flows along the broken line of the four-way valve 112.

  The first refrigerant pipe 151 is connected to the second refrigerant pipe 152 via the outdoor heat exchanger 115 at a location where the pressure adjusting means 114 is provided. The pressure adjusting means 114 reduces the pressure of the passing refrigerant, and can use, for example, an expansion valve. The outdoor heat exchanger 115 is an outdoor heat exchanger that exchanges heat between ambient air and the air conditioning refrigerant, and generally, a fin & tube type or micro tube type heat exchanger is used.

The second refrigerant pipe 152 is connected to one end of the indoor heat exchanger 113. The third refrigerant pipe 153 is connected to the other end of the indoor heat exchanger 113. The indoor heat exchanger 113 is an indoor heat exchanger in which the ambient air and the refrigerant flowing in the refrigeration cycle exchange heat, and generally, a fin & tube type or micro tube type heat exchanger is used.
The third refrigerant pipe 153 is connected to the suction pipe 154 at a position where the four-way valve 112 is provided. The suction pipe 154 is connected to the suction side of the rotary compressor 111.

In the refrigeration cycle apparatus 100, one end is connected to a second refrigerant pipe (an example as a refrigeration cycle other than a rotary compressor) 152, the other end is connected to a rotary compressor 111, and the rotary compressor 111 is supplied with an injection refrigerant. The injection piping 116 is provided.
The injection pipe 116 is a pipe for injecting a part of the refrigerant from the refrigeration cycle apparatus 100 into the rotary compressor 111.

The injection pipe 116 includes an on-off valve (valve) 117. The on-off valve 117 opens and closes the flow path of the injection pipe 116. The on-off valve 117 may be provided in the injection pipe 116 or an injection flow path 128 described later. That is, the on-off valve 117 may be provided between the connection portion 155 between the injection pipe 116 and the second refrigerant pipe 152 and the other end 127 of the injection flow path.
The open / close valve 117 is closed during the cooling operation.

FIG. 2 is a cross-sectional view of a compression mechanism portion of the rotary compressor 111 according to the first embodiment. FIG. 3 is a longitudinal sectional view of a compression mechanism portion of the rotary compressor 111 according to the first embodiment.
The rotary compressor 111 includes a shell 130. Inside the shell 130, a cylinder 121 is provided.
A central portion of the rotary compressor 111 is provided with a shaft 122. The shaft 122 includes an eccentric part 122a. A piston 123 is provided on the outer side in the circumferential direction of the shaft 122. The rotation of the shaft 122 causes the eccentric portion 122 a of the shaft 122 to rotate the piston 123 along the inner wall surface 121 a of the cylinder 121. The piston 123 has a lower end surface 123b.

  Inside the cylinder 121, a groove 121b is formed. The groove 121 b is provided with a vane 124. The vanes 124 reciprocate in the groove 121 b of the cylinder 121 so as to contact the outer peripheral surface 123 a of the piston 123 as the piston 123 rotates.

The rotary compressor 111 is provided with a suction port 125. The suction port 125 supplies the refrigerant to the inside of the cylinder 121.
The rotary compressor 111 also includes a discharge port 126. The discharge port 126 discharges the refrigerant to the outside of the cylinder 121. As shown in FIG. 3, a discharge valve 133 is provided above the discharge port 126. The discharge valve 133 is installed in the refrigerant flow path discharged from the discharge port 126. The discharge valve 133 opens when the pressure of the refrigerant in the compression chamber 129 described later becomes higher than the pressure inside the shell 130.

As shown in FIG. 3, an upper bearing 131 is provided at the top of the cylinder 121. The upper bearing 131 functions as a bearing that supports the shaft 122. A lower bearing 132 is provided below the cylinder 121. The lower bearing 132 functions as a bearing for supporting the shaft 122.
Inside the cylinder 121, a compression chamber 129 surrounded by the shaft 122, the piston 123, the vane 124, the upper bearing 131, and the lower bearing 132 and in contact with the discharge port 126 is provided.

The rotary compressor 111 is provided with an injection flow passage 128 whose one end communicates with the injection pipe 116 and the other end communicates with the compression chamber 129.
The other end 127 of the injection flow channel is provided on the upper portion of the lower bearing 132. That is, the other end 127 of the injection channel is in communication with the inside of the cylinder 121.
Thus, the injection pipe 116 is connected to the compression chamber 129 through the injection flow path 128 provided in the rotary compressor 111.

Next, the operation of the rotary compressor 111 in the present embodiment will be described.
First, low-pressure suction refrigerant is supplied from the suction port 125 to the compression chamber 129. Next, the refrigerant in the compression chamber 129 is compressed by the rotation of the piston 123, and when the pressure of the refrigerant in the compression chamber 129 becomes higher than the pressure inside the shell 130, the discharge valve 133 opens and the refrigerant compressed to high pressure is discharged. It is discharged from port 126.

  In the process of rotation of the piston 123, the other end 127 of the injection channel opens and closes by the movement of the lower end surface 123b. When the other end 127 of the injection flow channel is open, the injection refrigerant is supplied from the other end 127 of the injection flow channel to the compression chamber 129 through the injection pipe 116 and the injection flow channel 128 and merges with the refrigerant in the compression chamber 129 Do. On the other hand, when the other end 127127 of the injection flow channel is closed, the injection refrigerant is not supplied to the compression chamber 129 from the other end 127 of the injection flow channel.

Next, the operation of the refrigeration cycle in the present embodiment will be described.
In FIG. 1, during the heating operation, the flow path of the four-way valve 112 is set such that the flow of the refrigerant in the four-way valve 112 follows the solid line. Accordingly, the refrigerant compressed to a high pressure by the rotary compressor 111 is discharged from the rotary compressor 111, passes through the four-way valve 112, exits from the outdoor unit 101, and then enters the indoor unit 102. The refrigerant that has entered the indoor unit 102 releases heat to ambient air in the indoor heat exchanger 113 and condenses in a high-pressure supercooled liquid state and then returns to the outdoor unit 101 after leaving the indoor unit 102. Part of the refrigerant returned to the outdoor unit 101 flows into the injection pipe 116, and the remaining refrigerant flows into the pressure adjusting means 114. The refrigerant that has flowed to the pressure adjusting means 114 is decompressed by the pressure adjusting means 114 and then deprived of heat from the surrounding air in the outdoor heat exchanger 115 to evaporate, becoming a low pressure superheated gas state and passing through the four-way valve 112 It is drawn into the rotary compressor 111.
During heating operation, the on-off valve 117 is opened, so the refrigerant flowing into the injection pipe 116 passes through the on-off valve 117 in an open state, and then passes through the injection flow path 128 and is compressed from the other end 127 of the injection flow path It is supplied to the chamber 129.

On the other hand, during the cooling operation, the flow path of the four-way valve 112 is set so that the flow of the refrigerant in the four-way valve 112 follows the broken line. Therefore, the refrigerant compressed by the rotary compressor 111 to a high pressure is discharged from the rotary compressor 111, passes through the four-way valve 112, releases heat to the ambient air at the outdoor heat exchanger 115 and condenses. After coming out of the outdoor heat exchanger 115 in the state of a coolant, the pressure is reduced by the pressure adjusting means 114 to be a low pressure gas-liquid two-phase state. A part of the refrigerant in the gas-liquid two-phase state coming out of the pressure adjusting means 114 flows into the injection pipe 116 and the remaining refrigerant goes out of the outdoor unit 101 and then enters the indoor unit 102. The refrigerant that has entered the indoor unit 102 is deprived of heat from the surrounding air in the indoor heat exchanger 113 and evaporated to be in a low pressure superheated gas state and then returns to the outdoor unit 101 after leaving the indoor unit 102. The refrigerant returned to the outdoor unit 101 is drawn into the rotary compressor 111 through the four-way valve 112.
During the cooling operation, since the on-off valve 117 is closed, the refrigerant flowing into the injection pipe 116 is not supplied to the compression chamber 129 because it does not pass through the on-off valve 117 in the closed state.

  As described above, according to the present embodiment, one end is connected to the second refrigerant pipe (the refrigeration cycle other than the rotary compressor) 152, and the other end is connected to the rotary compressor 111, and the rotary compressor 111 The rotary compressor 111 is provided with an injection flow passage 128 whose one end is in communication with the injection piping 116 and the other end is in communication with the compression chamber 129, and the injection piping 116 or the injection flow passage is provided. An on-off valve (valve for adjusting the flow of refrigerant) 117 is provided at 128.

According to this, at the time of the cooling operation where the compression ratio is smaller than that at the heating operation, the piston rotation angle until the pressure of the refrigerant in the compression chamber 129 reaches the injection pressure becomes smaller, and the pressure of the injection refrigerant Because the pressure is low, the pressure of the refrigerant in the compression chamber 129 may reach the pressure of the injection refrigerant when the other end 127 of the injection flow path is open. However, in the configuration of the present embodiment, opening and closing during cooling operation The valve 117 is closed, and the refrigeration cycle and the compression chamber 129 do not communicate at the other end 127 of the injection channel.
Therefore, in the case of the rotary compressor 111 mounted in the refrigeration cycle apparatus of the present invention, when the pressure of the compression chamber 129 reaches the pressure of the injection refrigerant with the other end 127 of the injection flow passage open during the cooling operation, The refrigerant in the compression chamber 129 does not flow back to the refrigeration cycle through the other end 127 of the injection flow channel. Therefore, since the refrigerant compressed from the suction pressure to the pressure of the injection refrigerant is suppressed from being discharged into the refrigeration cycle, the refrigerant in the superheated gas state compressed from the suction pressure to the pressure of the injection refrigerant is discharged to the refrigeration cycle Since the reduction of the effect is suppressed, the efficiency of the refrigeration cycle can be improved.

Second Embodiment
The block diagram of the refrigerating-cycle apparatus 200 in Embodiment 2 of this invention is shown in FIG. The cross-sectional view of the compression mechanism part of the rotary compressor 211 in Embodiment 2 is shown in FIG. The longitudinal cross-sectional view of the compression mechanism part of the rotary compressor 211 in Embodiment 2 is shown in FIG.
The refrigeration cycle apparatus 200 of FIG. 4 includes one outdoor unit 101, and one indoor unit 102 is connected to the outdoor unit 101. The refrigeration cycle configuration is not limited to that shown in FIG. For example, two or more outdoor units 101 and two or more indoor units 102 can be connected in parallel. In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

In the second embodiment, the refrigeration cycle apparatus 200 includes a refrigerant extraction pipe 234. The refrigerant discharge pipe 234 is a refrigerant discharge pipe for operating the on-off valve through which the refrigerant for operating the on-off valve 217 described later flows.
One end of the refrigerant outlet pipe 234 is connected to the first refrigerant pipe 151. That is, one end of the refrigerant outlet pipe 234 is connected to the refrigerant pipe between the four-way valve 112 and the pressure adjusting means 114.
The other end of the refrigerant discharge pipe 234 is connected to the rotary compressor 211.

As shown in FIG. 6, the rotary compressor 211 includes an injection channel 228. One end of the injection channel is in communication with the injection pipe 116. Further, the other end 227 of the injection channel is in communication with the compression chamber 129.
The injection channel 228 includes a first injection channel 228 a in communication with the injection pipe 116, a housing portion 228 c for housing the on-off valve (valve) 217, and a second injection channel 228 b in communication with the compression chamber 129. Equipped with These are provided in the lower bearing 232.
The side portion of the housing portion 228c is in communication with the first injection flow passage 228a. The upper portion of the housing portion 228c is in communication with the second injection flow passage 228b.
The lower portion of the housing portion 228 c is in communication with the bypass flow passage 256. The bypass passage 256 communicates with the refrigerant outlet pipe 234. That is, the refrigerant discharge pipe 234 is connected to the housing portion 228 c which is an element of the injection flow path 228 via the bypass flow path 256.

The communication point 260 between the second injection channel 228b and the housing 228c is the communication point 262 between the first injection channel 228a and the housing 228c than the communication point 261 between the bypass channel 256 and the housing 228c. Provided on the side of the
The on-off valve 217 is provided between a communication point 260 between the second injection flow path 228b and the housing portion 228c and a communication point 261 between the bypass flow path 256 and the housing portion 228c.
The upper portion of the on-off valve 217 and the upper portion of the housing portion 228c may be in contact with each other. Further, the lower portion of the on-off valve 217 and the lower portion of the housing portion 228c may be in contact with each other.

One end of a spring 263 is attached to the open / close valve 217 on the side opposite to the side facing the first injection flow passage 228a. The other end of the spring 263 is attached to the side opposite to the side in communication with the first injection channel 228a in the housing portion 228c.
Therefore, the refrigerant flowing through the refrigerant extraction pipe 234 flows from the space into which the refrigerant is sent from the first injection flow passage 228 a to another space in the housing portion 228 c via the on-off valve 217.
The on-off valve 217 operates by the refrigerant pressure in the refrigerant outlet pipe 234.

  Thus, in the second embodiment, the on-off valve 217 is provided inside the rotary compressor 211. More specifically, the on-off valve 217 is provided in the housing portion 228 c of the injection flow channel 218.

Next, the operation of the refrigeration cycle in the present embodiment will be described.
In FIG. 4, during the heating operation, the flow path of the four-way valve 112 is set so that the flow of the refrigerant in the four-way valve 112 follows the solid line. Therefore, the refrigerant compressed to a high pressure by the rotary compressor 211 is discharged from the rotary compressor 211, passes through the four-way valve 112, exits from the outdoor unit 201, and then enters the indoor unit 102. The refrigerant that has entered the indoor unit 102 releases heat to ambient air in the indoor heat exchanger 113 and condenses in a high-pressure supercooled liquid state and then returns to the outdoor unit 101 after leaving the indoor unit 102. Part of the refrigerant returned to the outdoor unit 101 flows into the injection pipe 216, and the remaining refrigerant flows into the pressure adjusting means 114. The refrigerant that has flowed to the pressure adjusting means 114 is decompressed by the pressure adjusting means 114 and then is deprived of heat from the surrounding air by the outdoor heat exchanger 115 and evaporated to become a low pressure superheated gas state and the four-way valve 112 Then, it is sucked into the rotary compressor 211.
At this time, one end of the refrigerant outlet pipe 234 is connected between the four-way valve 112 and the outdoor heat exchanger 115, and the other end is connected to the on-off valve 217 inside the rotary compressor 211. The pressure of the refrigerant in the interior of the valve is low, and the on-off valve 217 is opened. Therefore, the refrigerant flowing into the injection pipe 216 passes through the first injection channel 228a to reach the housing portion 228c, and passes through the open / close valve 217 and the second injection channel 228b as shown in FIG. The pressure is supplied to the compression chamber 129 from the other end 227 of the injection flow channel.

On the other hand, during the cooling operation, the flow path of the four-way valve 112 is set so that the flow of the refrigerant in the four-way valve 112 follows the broken line. Therefore, the refrigerant compressed by the rotary compressor 211 to a high pressure is discharged from the rotary compressor 211, passes through the four-way valve 112, releases heat to the ambient air at the outdoor heat exchanger 115 and condenses. After coming out of the outdoor heat exchanger 115 in the state of a coolant, the pressure is reduced by the pressure adjusting means 114 to be a low pressure gas-liquid two-phase state. A part of the refrigerant in the gas-liquid two-phase state coming out of the pressure adjusting means 114 flows into the injection pipe 116 and the remaining refrigerant goes out of the outdoor unit 101 and then enters the indoor unit 102. The refrigerant that has entered the indoor unit 102 is deprived of heat from the surrounding air in the indoor heat exchanger 113 and evaporated to be in a low pressure superheated gas state and then returns to the outdoor unit 101 after leaving the indoor unit 102. The refrigerant returned to the outdoor unit 101 is drawn into the rotary compressor 211 through the four-way valve 112.
At this time, one end of the refrigerant outlet pipe 234 is connected between the four-way valve 112 and the outdoor heat exchanger 115, and the other end is connected to the on-off valve 217 inside the rotary compressor 211. The refrigerant pressure inside is high, and the on-off valve 217 is closed. Therefore, the refrigerant flowing into the first injection flow path 228a does not flow into the housing portion 228c because it does not pass through the on-off valve 217 in the closed state. Therefore, the refrigerant flowing into the injection pipe 216 is not supplied to the compression chamber 129.

As apparent from the above description, the rotary compressor 211 has a piston rotation angle until the pressure of the refrigerant in the compression chamber 129 reaches the injection pressure during the cooling operation in which the compression ratio is smaller than in the heating operation. In addition, the pressure of the refrigerant in the compression chamber 129 may reach the pressure of the injection refrigerant when the other end 227 of the injection flow channel is open because the pressure of the injection refrigerant becomes small and the pressure of the injection refrigerant becomes low. In the configuration of the embodiment, the on-off valve 217 is closed during the cooling operation by the on-off valve 217 installed in the inside of the rotary compressor 211, that is, the injection channel 228, and the injection piping 116 and the compression chamber 129 It does not communicate at the other end 227.
Therefore, in the case of the rotary compressor 211 mounted on the refrigeration cycle apparatus of the present invention, when the pressure of the compression chamber 129 reaches the pressure of the injection refrigerant with the other end 227 of the injection flow passage open during the cooling operation, The refrigerant in the compression chamber 129 does not flow back to the injection pipe 216 through the other end 227 of the injection flow channel. Therefore, since the refrigerant compressed from the suction pressure to the pressure of the injection refrigerant is suppressed from being discharged to the injection pipe 116, the refrigerant compressed from the suction pressure to the pressure of the injection refrigerant is discharged to the injection pipe 116, and then the compression chamber Since it is suppressed that work of the rotary compressor 211 is increased by returning to 129 and re-expansion, re-expansion and re-compression of the volume of the injection pipe 116 are suppressed, and the rotary compressor 211 is operated at high efficiency. The efficiency of the refrigeration cycle can be improved.

Further, in the rotary compressor 211, opening and closing of the on-off valve 217 can be opened and closed by the refrigerant pressure inside the refrigerant outlet pipe 234 without using an electrical actuator. The vicinity of the other end 227 of the injection channel is exposed to high temperature because it is close to the sliding portion of the compression chamber 129, and the space for disposing the on-off valve 217 is small. In addition, since an electric actuator is not used, a small on-off valve 217 excellent in heat resistance can be installed in the vicinity of the other end 227 of the injection flow channel inside the injection flow channel 228. Further, during the heating operation, the inside of the refrigerant outlet pipe 234 becomes the low pressure refrigerant pressure reduced by the pressure adjusting means 114, and the on-off valve 217 is opened. During the cooling operation, the pressure inside the refrigerant outlet pipe 234 The on-off valve 217 is closed when the pressure of the refrigerant is high before the pressure is reduced by the adjusting unit 114.
Therefore, even when the sliding load is high during cooling rated operation and the on-off valve 217 is exposed to the high temperature part in the vicinity of the sliding part, the on-off valve 217 is closed by the high pressure refrigerant pressure inside the refrigerant outlet pipe 234 Therefore, when the pressure in the compression chamber reaches the injection pressure when the other end 227 of the injection flow channel is open, the refrigerant in the compression chamber 129 does not flow back to the injection pipe 116 through the other end 227 of the injection flow channel. Therefore, even when the temperature in the vicinity of the sliding portion becomes high during the cooling rated operation, etc., recompression and expansion due to the backflow of the refrigerant to the injection pipe 116 are suppressed, and the rotary compressor 211 is operated at high efficiency. The refrigeration cycle efficiency can be improved.

  As mentioned above, although the present invention was explained based on this embodiment, the present invention is not limited to these embodiments. Since the embodiment of the present invention is illustrated to the last, any modification and application can be made without departing from the spirit of the present invention.

  The refrigeration cycle apparatuses 100 and 200 and the rotary compressors 111 and 211 according to the present embodiment are particularly effective for an apparatus having an operation condition for switching between cooling and heating, and an apparatus having an operation condition for reducing a pressure ratio. Become.

  The present invention can be suitably used as one that can improve the efficiency of the refrigeration cycle.

100, 200 refrigeration cycle apparatus 101 outdoor unit 102 indoor unit 111, 211 rotary compressor 112 four-way valve 113 indoor heat exchanger 114 pressure adjusting means 115 outdoor heat exchanger 116 injection piping 117, 217 on-off valve (valve)
121 cylinder 121a inner wall surface 121b groove 122 shaft 122a eccentric part 123 piston 123a outer peripheral surface 123b lower end surface 124 vane 125 suction port 126 discharge port 127, 227 other end of injection flow passage 128, 228 injection flow passage 129 compression chamber 130 shell 131 Upper bearing 132, 232 Lower bearing 133 Discharge valve 151 First refrigerant pipe (Refrigerant pipe between four-way valve and outdoor adjustment means)
152 Second refrigerant piping (Refrigeration cycle other than rotary compressor)
228a first injection flow path 228b second injection flow path 228c housing portion 234 refrigerant outlet pipe 256 bypass flow path 263 spring

Claims (5)

A refrigeration cycle apparatus comprising: a rotary compressor for compressing a refrigerant by a piston rotating inside a compression chamber, a four-way valve, an outdoor heat exchanger, an outdoor adjustment means, and an indoor heat exchanger,
One end is connected to the refrigeration cycle other than the rotary compressor, and the other end is connected to the rotary compressor, and includes an injection pipe for supplying an injection refrigerant to the rotary compressor,
The rotary compressor includes an injection flow passage having one end in communication with the injection pipe and the other end in communication with the compression chamber.
A refrigeration cycle apparatus comprising a valve for adjusting the flow of refrigerant in the injection pipe or the injection flow path.   The refrigeration cycle apparatus according to claim 1, wherein the valve is provided in the injection flow channel.   The refrigerant extraction pipe which is communicated with the valve from the refrigerant piping between the four-way valve and the outdoor adjustment means is provided, and the valve is operated by the refrigerant pressure in the refrigerant extraction pipe. The refrigeration cycle apparatus according to Item 2. In a rotary compressor which compresses a refrigerant by a piston rotating inside a compression chamber,
An injection flow path is provided, one end of which is connected to the refrigeration cycle other than the rotary compressor and the other end connected to the other end of the injection pipe connected to the rotary compressor, and which communicates with the compression chamber.
The said injection flow path is provided with the valve which adjusts the flow of a refrigerant | coolant, The rotary compressor characterized by the above-mentioned.   The rotary valve according to claim 4, wherein the valve is actuated by a refrigerant pressure in a refrigerant discharge pipe communicating with the valve from a refrigerant pipe between a four-way valve provided in the refrigeration cycle and the outdoor adjustment means. Compressor.

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