Multi-split air conditioning system and its variable capacity compressor unit

Abstract

This invention discloses a circulation system for multi-split air conditioning units and its variable capacity compressor device, relating to the field of compressor technology. The variable capacity compressor device includes: a scroll plate, a main suction pipe, a main suction port, a main enthalpy injection pipe, a main enthalpy injection port, a main unloading pipe, and a main unloading port. The scroll plate contains a first suction pipe, a second suction pipe, and a third suction pipe, each equipped with a suction valve. The scroll plate also contains a first unloading pipe, a second unloading pipe, and a third unloading pipe, each equipped with an unloading valve. The scroll plate also contains a first enthalpy injection pipe and a second enthalpy injection pipe, each equipped with an enthalpy injection valve. The first unloading pipe, the second suction pipe, and the first enthalpy injection pipe are connected; the second unloading pipe and the third suction pipe are connected; and the third unloading pipe and the second enthalpy injection pipe are connected. The first suction pipe is located at the end of a spiral channel. This device can improve the performance of the compressor under different operating modes, load conditions, and operating environments.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and more specifically, to a variable capacity compressor unit. Furthermore, it also relates to a multi-split air conditioning system including the aforementioned variable capacity compressor unit. Background Technology

[0002] In related technologies, existing compressors cannot effectively reduce the maximum temperature when operating at low temperatures, limiting the potential for increasing compressor frequency. When operating under low load, the compressor's ability to reduce cooling and heating capacity by decreasing frequency is also limited. Furthermore, bypassing the compressor reduces its operating efficiency. Even with both frequency reduction and bypassing, insufficient unloading of cooling and heating capacity may still occur.

[0003] In practical use: frequent starts occur under low load conditions, heating capacity decreases at low temperatures, affecting customer comfort, and compressor operating efficiency declines. When testing the Annual Performance Factor (APF) according to the national standard for multi-split air conditioners: excessively high minimum cooling and heating capacity, coupled with increased mechanical wear power due to reduced frequency, leads to a significant decrease in energy efficiency, potentially resulting in a low Energy Efficiency Ratio (EERmin) for multi-connected air-conditioning (heat pump) units, causing APF downgrading. A low measured APF value impacts product competitiveness. Simultaneously, the compressor's low-temperature heating capacity is limited by high maximum temperatures, restricting frequency increases and resulting in relatively low heating capacity. Low low-temperature heating capacity also affects customer comfort. When refrigerant pressure exceeds the limit: refrigerant is unloaded and enters the high-pressure chamber, reducing the quality of the discharged refrigerant and affecting the performance of the refrigeration system.

[0004] Currently, common compressors typically have one intake port, one enthalpy injection port, and three unloading ports on the scroll plate. The compressor adjusts its capacity through frequency regulation; however, it cannot unload under excessively low loads, leading to frequent shutdowns. When liquid compression occurs, the pressure rises sharply due to the liquid state, easily causing the scroll plate to break and resulting in irreparable damage. In this situation, the unloading valve discharges refrigerant without injecting it into the gas-liquid separator (into the exhaust side refrigerant), failing to raise the separator temperature and thus hindering the compressor's operating environment, resulting in a high risk of liquid slugging. Furthermore, when the compressor operates under high load, its enthalpy injection capacity becomes a bottleneck, causing the coil temperature to rise, limiting frequency increases, and consequently affecting the compressor's operating capacity.

[0005] In summary, how to improve the performance of compressors under different operating modes, load conditions, and operating environments is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a variable capacity compressor device that can effectively improve the performance of the compressor under different operating modes, different load conditions and different operating environments.

[0007] Another object of the present invention is to provide a multi-unit product circulation system including the above-described variable capacity compressor device.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A variable capacity compressor device includes: a scroll plate, a main suction pipe, a main suction port located at the connection between the main suction pipe and the scroll plate, a main enthalpy injection pipe, a main enthalpy injection port located at the connection between the main enthalpy injection pipe and the scroll plate, a main unloading pipe, and a main unloading port located at the connection between the main unloading pipe and the scroll plate. The scroll plate has a spiral channel and an exhaust port at its center. The scroll plate has a first suction pipe, a second suction pipe, and a third suction pipe arranged in parallel and all connected to the main suction port. Each suction pipe is equipped with a suction valve to control the path of refrigerant entering the scroll plate.

[0010] The scroll plate is provided with a first unloading pipe, a second unloading pipe, and a third unloading pipe arranged in parallel and all connected to the main unloading port. Each unloading pipe is provided with an unloading valve to control the amount of refrigerant unloaded. The scroll plate is also provided with a first enthalpy injection pipe and a second enthalpy injection pipe arranged in parallel and all connected to the main enthalpy injection port. Each enthalpy injection pipe is provided with an enthalpy injection valve to control the path of the injected refrigerant into the scroll plate.

[0011] The first unloading pipe, the second suction pipe, and the first enthalpy injection pipe are connected. The second unloading pipe is connected to the third suction pipe, and the third unloading pipe is connected to the second enthalpy injection pipe. The first suction pipe is located at the end of the spiral channel.

[0012] Preferably, it further includes a cooling ring sleeved on the outer periphery of the motor, a first cooling pipe is provided between the main enthalpy injection pipe and the cooling ring, a second cooling pipe is provided between the cooling ring and the main enthalpy injection port, a first cooling valve is provided at the connection between the first cooling pipe and the second cooling pipe, and a second cooling valve is provided inside the second cooling pipe.

[0013] Preferably, it also includes a fourth suction pipe connected to the main suction port, the fourth suction pipe being provided with a fourth suction valve, and the third unloading pipe, the fourth suction pipe, the second injection enthalpy pipe and the vortex disk being connected through a four-way connector.

[0014] Preferably, the first unloading pipe, the second intake pipe, the first enthalpy injection pipe, and the vortex disk are connected by a four-way connector, the second unloading pipe, the third intake pipe, and the vortex disk are connected by a three-way connector, and the third unloading pipe, the second enthalpy injection pipe, and the vortex disk are connected by a three-way connector.

[0015] A multi-split air conditioning unit circulation system includes: a variable frequency compressor, a four-way valve, an outdoor unit heat exchanger, a plate heat exchanger, a gas-liquid separator, and a control device, wherein the variable frequency compressor is any of the variable capacity compressor devices described above.

[0016] The variable frequency compressor, the four-way valve, the outdoor unit heat exchanger, the first electronic expansion valve, the plate heat exchanger, and the liquid pipe shut-off valve are connected in sequence through pipelines. The gas pipe shut-off valve, the four-way valve, the gas-liquid separator, and the variable frequency compressor are connected in sequence. Both the liquid pipe shut-off valve and the gas pipe shut-off valve are used to connect to the indoor unit.

[0017] The variable frequency compressor, the four-way valve, the first electronic expansion valve, the liquid pipe shut-off valve, and the gas pipe shut-off valve are all connected to the control device.

[0018] Preferably, the variable frequency compressor is equipped with a top temperature sensor, the variable frequency compressor is equipped with an electric heating wire, and the pipeline used to connect the variable frequency compressor and the four-way valve is equipped with a high-pressure switch and an exhaust temperature sensor.

[0019] The top temperature sensor, the electric heating wire, the high-voltage switch, and the exhaust temperature sensor are all connected to the control device.

[0020] Preferably, the outdoor unit heat exchanger is equipped with an outdoor unit fan motor and an outdoor temperature sensor, and a condenser outlet temperature sensor is provided on the pipeline connecting the outdoor unit heat exchanger and the first electronic expansion valve. The outdoor unit fan motor, the outdoor temperature sensor, and the condenser outlet temperature sensor are all connected to the control device.

[0021] Preferably, a first branch pipe, a second branch pipe, and a third branch pipe are provided between the plate heat exchanger and the liquid pipe shut-off valve. The first branch pipe and the second branch pipe are distributed in parallel and are both connected in series with the third branch pipe. The third branch pipe is connected to the liquid pipe shut-off valve.

[0022] The second branch pipe is equipped with a second electronic expansion valve and an inlet temperature sensor, and the third branch pipe is equipped with a liquid pipe temperature sensor. The second electronic expansion valve, the inlet temperature sensor, and the liquid pipe temperature sensor are all connected to the control device.

[0023] Preferably, an outlet temperature sensor and a bypass valve are provided on the pipeline used to connect the plate heat exchanger and the gas-liquid separator, and both the outlet temperature sensor and the bypass valve are connected to the control device.

[0024] Preferably, a fourth branch pipe and a fifth branch pipe are provided between the variable frequency compressor and the gas-liquid separator, and a low pressure sensor is provided on the fifth branch pipe;

[0025] A solenoid valve is provided on the pipeline used to connect the variable frequency compressor and the plate heat exchanger, and a suction temperature sensor is provided on the pipeline used to connect the four-way valve and the gas-liquid separator;

[0026] The low-pressure sensor, the solenoid valve, and the intake temperature sensor are all connected to the control device.

[0027] When using the variable capacity compressor device provided by this invention, a first suction valve can be installed in the first suction pipe, a second suction valve in the second suction pipe, and a third suction valve in the third suction pipe; a first unloading valve can be installed in the first unloading pipe, a second unloading valve in the second unloading pipe, and a third unloading valve in the third unloading pipe; a first enthalpy injection valve can be installed in the first enthalpy injection pipe, and a second enthalpy injection valve can be installed in the second enthalpy injection pipe. Furthermore, the first, second, and third unloading valves are all constant-pressure unloading valves, meaning they only open when the corresponding pressure is reached, and unloading and reloading occur at that unloading valve. Starting from the center of the scroll plate, the spiral channel sequentially passes through the third suction pipe, the second suction pipe, and the first suction pipe.

[0028] When the device is in high-temperature refrigeration operation, the first suction valve can be opened and the second and third suction valves can be closed. Therefore, the refrigerant enters the first suction valve from the main suction port and then enters the scroll plate to ensure the maximum suction volume. At the same time, the first and second enthalpy injection valves are closed to prevent the system pressure from being too high and to ensure the safe operation of the system.

[0029] When the device is in normal temperature cooling and heating operation, the first suction valve can be opened and the second and third suction valves can be closed. Therefore, the refrigerant enters the first suction valve from the main suction port and then enters the turbine disk to ensure the maximum suction volume. At the same time, the first injection enthalpy valve can be opened and the second injection enthalpy valve can be closed. The injected refrigerant can enter the first injection enthalpy valve from the main injection enthalpy port to inject enthalpy into the turbine disk and improve the device's operating capacity.

[0030] When the unit is operating under medium load, the second suction valve can be opened while the first and third suction valves are closed. Therefore, the refrigerant enters the second suction valve from the main suction port and then enters the scroll plate, allowing partial utilization of the scroll plate, reducing the suction volume, and ensuring the frequency operates within the efficiency range. Furthermore, when the unit is in a high-temperature environment, the first and second enthalpy injection valves are closed to prevent excessive system pressure. When the unit is in a normal-temperature environment, the second enthalpy injection valve is opened, the first enthalpy injection valve is closed, and the cooling ring is activated to achieve small-capacity enthalpy injection, ensuring subcooling while improving compressor operating efficiency.

[0031] When the unit is operating at minimum load, the third suction valve can be opened and the first and second suction valves closed. Therefore, the refrigerant enters the third suction valve from the main suction port and then enters the scroll plate, minimizing the scroll plate's usage and suction volume. Furthermore, the first and second enthalpy injection valves can be closed to achieve minimal volume change.

[0032] Furthermore, under various operating conditions, the gaseous refrigerant can be discharged from the exhaust port of the scroll plate. However, when the compressor experiences liquid compression, the compressor pressure rises sharply, which can easily cause the scroll plate to break, leading to an unrepairable malfunction. At this time, the first, second, and third unloading valves all reach their set pressures and need to be opened promptly to protect the compressor. This allows the unloaded refrigerant to be injected into the gas-liquid separator, increasing the separator temperature, improving the compressor's operating environment, and reducing the risk of liquid slugging. Simultaneously, since the unloaded refrigerant does not mix with the existing refrigerant on the exhaust side, the exhaust temperature will not decrease, ensuring a safer system operating environment.

[0033] In summary, the variable capacity compressor device provided by this invention can effectively improve the performance of the compressor under different operating modes, different load conditions, and different operating environments.

[0034] Furthermore, the present invention also provides a multi-unit product circulation system including the above-described variable capacity compressor device. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 A schematic diagram of the internal structure of the turbine disk of the variable capacity compressor device provided by the present invention;

[0037] Figure 2 This is a front view of a variable capacity compressor unit;

[0038] Figure 3 for Figure 1 Schematic diagram of the central pipeline and control valves;

[0039] Figure 4 This is a schematic diagram of the circulation system of the multi-split air conditioner provided by the present invention.

[0040] Figures 1-4 middle:

[0041] 1 is the vortex disk, 2 is the main intake pipe, 3 is the main enthalpy injection pipe, 4 is the main intake port, 41 is the first intake pipe, 42 is the second intake pipe, 43 is the third intake pipe, 44 is the fourth intake pipe, 45 is the first intake valve, 46 is the second intake valve, 47 is the third intake valve, 48 is the fourth intake valve, 5 is the main enthalpy injection port, 51 is the first enthalpy injection pipe, 52 is the second enthalpy injection pipe, 53 is the first enthalpy injection valve, 54 is the second enthalpy injection valve, 6 is the main unloading pipe, 7 is the main unloading port, 71 is the first unloading pipe, 72 is the second unloading pipe, 73 is the third unloading pipe, 74 is the first unloading valve, 75 is the second unloading valve, 76 is the third unloading valve, 8 is the cooling ring, 81 is the first cooling pipe, 82 is the second cooling pipe, 83 is the first cooling valve, 84 is... 9 is the second cooling valve, 10 is the three-way connector, 11 is the four-way connector, 12 is the variable frequency compressor, 13 is the four-way valve, 14 is the outdoor unit heat exchanger, 15 is the plate heat exchanger, 16 is the gas-liquid separator, 17 is the first electronic expansion valve, 18 is the liquid pipe shut-off valve, 19 is the gas pipe shut-off valve, 20 is the top temperature sensor, 21 is the electric heating wire, 22 is the high-pressure switch, 23 is the exhaust temperature sensor, 24 is the outdoor unit fan motor, 25 is the outdoor temperature sensor, 26 is the condenser outlet temperature sensor, 27 is the second electronic expansion valve, 28 is the inlet temperature sensor, 29 is the liquid pipe temperature sensor, 30 is the outlet temperature sensor, 31 is the bypass valve, 32 is the low-pressure sensor, 33 is the solenoid valve, and 34 is the suction temperature sensor. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] The core of this invention is to provide a variable capacity compressor device that can effectively improve the performance of the compressor under different operating modes, different load conditions and different operating environments.

[0044] Another core aspect of this invention is to provide a multi-unit product circulation system that includes the aforementioned variable capacity compressor device.

[0045] Please refer to Figures 1 to 4 .

[0046] This specific embodiment provides a variable capacity compressor device, including: a scroll plate 1, a main suction pipe 2, a main suction port 4 located at the connection between the main suction pipe 2 and the scroll plate 1, a main injection enthalpy pipe 3, a main injection enthalpy port 5 located at the connection between the main injection enthalpy pipe 3 and the scroll plate 1, a main unloading pipe 6, and a main unloading port 7 located at the connection between the main unloading pipe 6 and the scroll plate 1. The scroll plate 1 is provided with a spiral channel and an exhaust port at the center. The scroll plate 1 is provided with a first suction pipe 41, a second suction pipe 42, and a third suction pipe 43 arranged in parallel and all connected to the main suction port 4. Each suction pipe is provided with a suction valve to control the path of refrigerant entering the scroll plate 1.

[0047] The scroll plate 1 is provided with a first unloading pipe 71, a second unloading pipe 72 and a third unloading pipe 73 that are distributed in parallel and are all connected to the main unloading port 7. Each unloading pipe is provided with an unloading valve to control the amount of refrigerant unloaded. The scroll plate 1 is also provided with a first enthalpy injection pipe 51 and a second enthalpy injection pipe 52 that are distributed in parallel and are all connected to the main enthalpy injection port 5. Each enthalpy injection pipe is provided with an enthalpy injection valve to control the path of the injected refrigerant into the scroll plate 1.

[0048] The first unloading pipe 71, the second suction pipe 42 and the first enthalpy injection pipe 51 are connected. The second unloading pipe 72 and the third suction pipe 43 are connected. The third unloading pipe 73 and the second enthalpy injection pipe 52 are connected. The first suction pipe 41 is located at the end of the spiral channel.

[0049] It should be noted that this device is a positive displacement compressor, and the compression component consists of a moving scroll plate 1 and a stationary scroll plate. Its working principle is to utilize the relative revolution of the moving scroll plate 1 and the stationary scroll plate 1 to create a continuous change in the closed volume, thereby achieving the purpose of gas compression. The exhaust gas is used to cool the motor, and a back pressure chamber structure is employed to balance the axial gas force borne by the moving scroll plate 1.

[0050] It should also be noted that when the compressor is operating under high load, the first enthalpy injection valve 53 and the second enthalpy injection valve 54 can be controlled in coordination to increase the enthalpy injection channel and maintain sufficient enthalpy injection. When the compressor is operating at risk of liquid compression, the unloading valves can be opened to discharge the unloaded refrigerant into the gas-liquid separator. This prevents the temperature and pressure of the refrigerant on the discharge side from dropping while simultaneously increasing the temperature of the refrigerant on the suction side, improving the suction environment, and preventing liquid compression.

[0051] Based on the above embodiments, preferably, it also includes a cooling ring 8 sleeved on the outer periphery of the motor, a first cooling pipe 81 provided between the main enthalpy injection pipe 3 and the cooling ring 8, a second cooling pipe 82 provided between the cooling ring 8 and the main enthalpy injection port 5, a first cooling valve 83 provided at the connection between the first cooling pipe 81 and the second cooling pipe 82, and a second cooling valve 84 provided inside the second cooling pipe 82.

[0052] It should be noted that when motor cooling is required, the first cooling valve 83 can be closed and the second cooling valve 84 opened, allowing the refrigerant to first enter the cooling ring 8 to cool the motor, and then the refrigerant enters the main injection port 5. When motor cooling is not required, the second cooling valve 84 can be closed and the first cooling valve 83 opened, and the refrigerant can be directly injected into the main injection port 5 using the bypass pipe.

[0053] It should also be noted that when the device is in low-temperature heating operation, the suction density decreases. The first suction valve 45 can be opened and the second suction valve 46 and the third suction valve 47 can be closed. Therefore, the refrigerant enters the first suction valve 45 from the main suction port 4 and then enters the scroll plate 1 to ensure the maximum suction volume. At this time, the motor cooling effect is poor, the maximum motor temperature is high, and the compressor coil is in a harsh operating condition. Therefore, the first injection enthalpy valve 53 and the second injection enthalpy valve 54 can be opened, the second cooling valve 84 can be opened, and the first cooling valve 83 can be closed to introduce the injected refrigerant into the motor cooling ring 8 first. The injected refrigerant cools the motor and then enters the first injection enthalpy valve 53 and the second injection enthalpy valve 54 of the compressor to prevent the compressor coil temperature from being too high and the injection enthalpy from carrying liquid. After the maximum temperature decreases, the frequency rise space increases, which can effectively improve the heating capacity.

[0054] Preferably, it also includes a fourth suction pipe 44 connected to the main suction port 4. The fourth suction pipe 44 is provided with a fourth suction valve 48. The third unloading pipe 73, the fourth suction pipe 44, the second injection enthalpy pipe 52 and the vortex disk 1 are connected through a four-way connector 10.

[0055] Preferably, the first unloading pipe 71, the second intake pipe 42, the first enthalpy injection pipe 51 and the vortex disk 1 are connected by a four-way connector 10, the second unloading pipe 72, the third intake pipe 43 and the vortex disk 1 are connected by a three-way connector 9, and the third unloading pipe 73, the second enthalpy injection pipe 52 and the vortex disk 1 are connected by a three-way connector 9.

[0056] It should be noted that the center of the vortex disk 1 can be set as the starting point, and the air can be passed sequentially along the spiral channel through the third suction pipe 43, the fourth suction pipe 44, the second suction pipe 42, and the first suction pipe 41, that is, it can be like... Figure 1 , 3The setup shown includes a first suction valve 45, a second suction valve 46, and a third suction valve 47. By controlling the operation of the first suction valve 45, the second suction valve 46, the third suction valve 47, and the fourth suction valve 48, the position and path of the refrigerant entering the scroll plate 1 through the main suction port 4 can be changed.

[0057] It should also be noted that when the compressor is running under partial load, the suction valves can be coordinated to change the suction port position, reducing the compressor displacement and enabling continuous operation of the air conditioner. This minimizes the efficiency drop and reduced customer discomfort caused by starting and stopping. In other words, this device changes the compressor capacity by altering the compressor frequency and displacement, allowing it to handle smaller loads and preventing frequent starts due to insufficient unloading, thus making the system more efficient. Furthermore, safe unloading and motor cooling further ensure safer and more stable system operation.

[0058] To further illustrate the use of this device, an example will be given below.

[0059] When using the variable capacity compressor device provided by this invention, when the device is in high-temperature refrigeration operation, the first suction valve 45 can be opened and the second suction valve 46 and the third suction valve 47 can be closed. Therefore, the refrigerant enters the first suction valve 45 from the main suction port 4 and then enters the scroll plate 1 to ensure the maximum suction volume. At the same time, the first enthalpy injection valve 53 and the second enthalpy injection valve 54 are closed, and the first cooling valve 83 is opened and the second cooling valve 84 is closed to prevent the system pressure from being too high and to ensure the safe operation of the system.

[0060] When the device is operating in normal temperature cooling and heating mode, the first intake valve 45 can be opened and the second intake valve 46 and the third intake valve 47 can be closed. Therefore, the refrigerant enters the first intake valve 45 from the main intake port 4 and then enters the turbine disk 1 to ensure maximum intake volume. Simultaneously, the first enthalpy injection valve 53 can be opened and the second enthalpy injection valve 54 can be closed, and the first cooling valve 83 can be opened and the second cooling valve 84 can be closed. The injected refrigerant can enter the first enthalpy injection valve 53 from the main enthalpy injection port 5 to increase the enthalpy of the turbine disk, thereby improving the device's operating capacity.

[0061] When the device is in low-temperature heating operation, the suction density decreases. The first suction valve 45 can be opened and the second suction valve 46 and the third suction valve 47 can be closed. Therefore, the refrigerant enters the first suction valve 45 from the main suction port 4 and then enters the scroll plate 1 to ensure the maximum suction volume. At this time, the motor cooling effect is poor, the maximum motor temperature is high, and the compressor coil is in a harsh operating condition. Therefore, the first injection enthalpy valve 53 and the second injection enthalpy valve 54 can be opened, and the second cooling valve 84 can be opened and the first cooling valve 83 can be closed to introduce the injected refrigerant into the motor cooling ring 8. The injected refrigerant can enter the second cooling valve 84 through the main injection enthalpy port 5 to cool the motor. Then, the injected refrigerant enters the first injection enthalpy valve 53 and the second injection enthalpy valve 54 of the compressor to prevent the compressor coil temperature from being too high and the injection enthalpy from carrying liquid. After the maximum temperature decreases, the frequency rise space increases, which can effectively improve the heating capacity.

[0062] When the unit is operating under medium load, the second suction valve 46 can be opened and the first suction valve 45 and the third suction valve 47 can be closed. Therefore, the refrigerant enters the second suction valve 46 from the main suction port 4 and then enters the scroll plate 1, allowing the scroll plate 1 to be partially utilized, reducing the suction volume and ensuring the frequency operates within the efficiency range. Furthermore, when the unit is in a high-temperature environment, the first enthalpy injection valve 53 and the second enthalpy injection valve 54 are closed, and the first cooling valve 83 is opened and the second cooling valve 84 is closed. The injected refrigerant can enter the first enthalpy injection valve 53 through the main enthalpy injection port 5 to prevent excessive system pressure. When the unit is in a normal-temperature environment, the second enthalpy injection valve 54 is opened and the first enthalpy injection valve 53 is closed, and the first cooling valve 83 is opened and the second cooling valve 84 is closed. The injected refrigerant can enter the second enthalpy injection valve 54 through the main enthalpy injection port 5 to achieve small-capacity enthalpy injection, ensuring subcooling while improving compressor operating efficiency.

[0063] When the device is operating under minimum load, the third suction valve 47 can be opened and the first suction valve 45 and the second suction valve 46 can be closed. Therefore, the refrigerant enters the third suction valve 47 from the main suction port 4 and then enters the scroll plate 1, minimizing the amount of refrigerant used in the scroll plate 1 and the suction volume. Furthermore, the first enthalpy injection valve 53 and the second enthalpy injection valve 54 can be closed, and the first cooling valve 83 can be opened and the second cooling valve 84 closed, achieving minimum volume change.

[0064] Furthermore, under various operating conditions, the gaseous refrigerant can be discharged from the exhaust port of the scroll plate 1. However, when the compressor experiences liquid compression, the compressor pressure rises sharply, which can easily cause the scroll plate 1 to break, resulting in an unrepairable malfunction. At this time, the first unloading valve 74, the second unloading valve 75, and the third unloading valve 76 all reach their set pressures and need to be opened in time to protect the compressor. The unloaded refrigerant is injected into the gas-liquid separator 15 to increase the temperature of the gas-liquid separator 15, improve the compressor's operating environment, and reduce the risk of liquid slugging. At the same time, since the unloaded refrigerant will not mix with the existing refrigerant on the exhaust side, the exhaust temperature will not decrease, thus better ensuring a safer system operating environment.

[0065] In addition to the aforementioned variable capacity compressor device, this invention also provides a multi-split air conditioning system including the variable capacity compressor device disclosed in the above embodiments. The multi-split air conditioning system includes: a variable frequency compressor 11, a four-way valve 12, an outdoor unit heat exchanger 13, a plate heat exchanger 14, a gas-liquid separator 15, and a control device. The variable frequency compressor 11 is the aforementioned variable capacity compressor device. The variable frequency compressor 11, four-way valve 12, outdoor unit heat exchanger 13, first electronic expansion valve 16, plate heat exchanger 14, and liquid line shut-off valve 17 are sequentially connected via pipelines. The gas line shut-off valve 18, four-way valve 12, gas-liquid separator 15, and variable frequency compressor 11 are sequentially connected. Both the liquid line shut-off valve 17 and the gas line shut-off valve 18 are used to connect to the indoor unit. The variable frequency compressor 11, four-way valve 12, first electronic expansion valve 16, liquid line shut-off valve 17, and gas line shut-off valve 18 are all connected to the control device. The structure of other parts of this multi-split air conditioning system is described in the prior art and will not be repeated here.

[0066] Preferably, the variable frequency compressor 11 is equipped with a top temperature sensor 19, and an electric heating wire 20 is installed inside the variable frequency compressor 11. Both the top temperature sensor 19 and the electric heating wire 20 are connected to the control device. Therefore, the control device can detect the operating status of the variable frequency compressor 11 in real time and control the electric heating wire 20 to perform heating operations.

[0067] Preferably, a high-pressure switch 21 and an exhaust temperature sensor 22 are provided on the pipeline used to connect the variable frequency compressor 11 and the four-way valve 12, and both the high-pressure switch 21 and the exhaust temperature sensor 22 are connected to the control device.

[0068] Based on the above embodiments, preferably, the outdoor unit heat exchanger 13 is equipped with an outdoor unit fan motor 23 and an outdoor temperature sensor 24, and a condenser outlet temperature sensor 25 is provided on the pipeline connecting the outdoor unit heat exchanger 13 and the first electronic expansion valve 16. The outdoor unit fan motor 23, the outdoor temperature sensor 24, and the condenser outlet temperature sensor 25 are all connected to the control device. Therefore, the control device can obtain the detection signal of the outdoor temperature sensor 24 and control the outdoor unit fan motor 23 to operate, so as to dissipate heat from the outdoor unit heat exchanger 13.

[0069] Preferably, a first branch pipe, a second branch pipe, and a third branch pipe are provided between the plate heat exchanger 14 and the liquid pipe shut-off valve 17. The first branch pipe and the second branch pipe are distributed in parallel and are both connected in series with the third branch pipe. The third branch pipe is connected to the liquid pipe shut-off valve 17. A second electronic expansion valve 26 and an inlet temperature sensor 27 are provided on the second branch pipe, and a liquid pipe temperature sensor 28 is provided on the third branch pipe. The second electronic expansion valve 26, the inlet temperature sensor 27, and the liquid pipe temperature sensor 28 are all connected to the control device so that the control device can detect the operating status of the plate heat exchanger 14 and the gas-liquid separator 15 in a timely manner.

[0070] Preferably, an outlet temperature sensor 29 and a bypass valve 30 are provided on the pipeline used to connect the plate heat exchanger 14 and the gas-liquid separator 15. Both the outlet temperature sensor 29 and the bypass valve 30 are connected to the control device so that the control device can detect the operating status of the plate heat exchanger 14 and the gas-liquid separator 15 in a timely manner.

[0071] Preferably, a fourth branch pipe and a fifth branch pipe are provided between the variable frequency compressor 11 and the gas-liquid separator 15, and a low pressure sensor 31 is provided on the fifth branch pipe; a solenoid valve 32 is provided on the pipeline used to connect the variable frequency compressor 11 and the plate heat exchanger 14, and a suction temperature sensor 33 is provided on the pipeline used to connect the four-way valve 12 and the gas-liquid separator 15; the low pressure sensor 31, the solenoid valve 32 and the suction temperature sensor 33 are all connected to the control device.

[0072] It should be noted that when the multi-split air conditioner's circulation system is in refrigeration cycle, the refrigerant flow path is as follows: the high-temperature and high-pressure refrigerant discharged by the inverter compressor 11 passes through the four-way valve 12 and enters the outdoor unit heat exchanger 13, where it is cooled into low-temperature and high-pressure refrigerant. The low-temperature and high-pressure refrigerant then passes through the first electronic expansion valve 16, the plate heat exchanger 14, and the liquid pipe shut-off valve 17 to supply the indoor unit with low-temperature and high-pressure refrigerant.

[0073] After being processed by the indoor unit, the low-temperature and low-pressure refrigerant enters the gas pipe shut-off valve 18 and the four-way valve 12, and then enters the gas-liquid separator 15. The gaseous refrigerant returns to the inverter compressor 11.

[0074] Furthermore, the enthalpy injection path in the refrigeration state is as follows: the low-temperature and high-pressure refrigerant of the plate heat exchanger 14 is throttled and depressurized by the second electronic expansion valve 26 and enters the gas-liquid separator 15 or the variable frequency compressor 11 (which can control the opening and closing of the bypass valve 30 and the solenoid valve 32).

[0075] When the multi-split air conditioner's circulation system is in heating cycle, the refrigerant flow path is as follows: the high-temperature, high-pressure refrigerant discharged from the inverter compressor 11 passes through the four-way valve 12 and the gaseous pipe shut-off valve to supply the high-temperature, high-pressure refrigerant to the indoor unit. The low-temperature, high-pressure refrigerant in the indoor unit passes through the liquid pipe shut-off valve and the plate heat exchanger 14 to reach the first electronic expansion valve 16. After throttling and pressure reduction, it becomes low-temperature, low-pressure refrigerant and enters the outdoor unit's heat exchanger 13. After heat exchange, the low-temperature, low-pressure refrigerant enters the gas-liquid separator 15 through the four-way valve 12, and the gaseous refrigerant enters the inverter compressor 11.

[0076] Furthermore, the enthalpy injection path in the heating state is as follows: the low-temperature and high-pressure refrigerant of the plate heat exchanger 14 is throttled and depressurized by the second electronic expansion valve 26 and enters the gas-liquid separator 15 or the variable frequency compressor 11 (which can control the opening and closing of the bypass valve 30 and the solenoid valve 32).

[0077] It should be noted that the first suction pipe 41 and the second suction pipe 42, the third suction pipe 43 and the fourth suction pipe 44, the first suction valve 45 and the second suction valve 46 and the third suction valve 47 and the fourth suction valve 48, the first unloading pipe 71 and the second unloading pipe 72 and the third unloading pipe 73, the first unloading valve 74 and the second unloading valve 75 and the third unloading valve 76, the first enthalpy injection pipe 51 and the second enthalpy injection pipe 52, the first enthalpy injection valve 53 and the second enthalpy injection valve 54, the first cooling pipe 81 and the second cooling pipe 82, the first cooling valve 83 and the second cooling valve 84, the first branch pipe and the second branch pipe and the third branch pipe, the first electronic expansion valve 16 and the second electronic expansion valve 26 mentioned in this application are only distinguished by their different positions and do not have any order of priority.

[0078] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. Any combination of all embodiments provided by this invention is within the scope of protection of this invention and will not be elaborated upon here.

[0079] The above provides a detailed description of the multi-split air conditioning system and its variable capacity compressor device provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A variable capacity compressor device, comprising: The vortex disk (1), main intake pipe (2), main intake port (4) located at the connection between the main intake pipe (2) and the vortex disk (1), main injection enthalpy pipe (3), main injection enthalpy port (5) located at the connection between the main injection enthalpy pipe (3) and the vortex disk (1), main unloading pipe (6), and main unloading port (7) located at the connection between the main unloading pipe (6) and the vortex disk (1) are provided. The vortex disk (1) is provided with a spiral channel and an exhaust port at the center. The vortex disk (1) is characterized in that the vortex disk (1) is provided with a first intake pipe (41), a second intake pipe (42), and a third intake pipe (43) that are distributed in parallel and are all connected to the main intake port (4). Each intake pipe is provided with an intake valve to control the path of the refrigerant entering the vortex disk (1). The scroll plate (1) is provided with a first unloading pipe (71), a second unloading pipe (72) and a third unloading pipe (73) that are distributed in parallel and are all connected to the main unloading port (7). Each unloading pipe is provided with an unloading valve to control the amount of refrigerant unloading. The scroll plate (1) is provided with a first enthalpy injection pipe (51) and a second enthalpy injection pipe (52) that are distributed in parallel and are all connected to the main enthalpy injection port (5). Each enthalpy injection pipe is provided with an enthalpy injection valve to control the path of the injected refrigerant into the scroll plate (1). The first unloading pipe (71), the second suction pipe (42) and the first enthalpy injection pipe (51) are connected. The second unloading pipe (72) and the third suction pipe (43) are connected. The third unloading pipe (73) and the second enthalpy injection pipe (52) are connected. The first suction pipe (41) is located at the end of the spiral channel.

2. The variable capacity compressor device according to claim 1, characterized in that, It also includes a cooling ring (8) fitted around the outer periphery of the motor, a first cooling pipe (81) between the main enthalpy injection pipe (3) and the cooling ring (8), a second cooling pipe (82) between the cooling ring (8) and the main enthalpy injection port (5), a first cooling valve (83) at the connection between the first cooling pipe (81) and the second cooling pipe (82), and a second cooling valve (84) inside the second cooling pipe (82).

3. The variable capacity compressor device according to claim 2, characterized in that, It also includes a fourth suction pipe (44) connected to the main suction port (4), and a fourth suction valve (48) is provided in the fourth suction pipe (44). The third unloading pipe (73), the fourth suction pipe (44), the second injection enthalpy pipe (52) and the vortex disk (1) are connected by a four-way connector (10).

4. The variable capacity compressor device according to any one of claims 1 to 3, characterized in that, The first unloading pipe (71), the second intake pipe (42), the first enthalpy injection pipe (51), and the vortex disk (1) are connected by a four-way connector (10). The second unloading pipe (72), the third intake pipe (43), and the vortex disk (1) are connected by a three-way connector (9). The third unloading pipe (73), the second enthalpy injection pipe (52), and the vortex disk (1) are connected by a three-way connector (9).

5. A multi-split air conditioning product circulation system, characterized in that, include: The variable frequency compressor (11), four-way valve (12), outdoor unit heat exchanger (13), plate heat exchanger (14), gas-liquid separator (15) and control device, wherein the variable frequency compressor (11) is the variable capacity compressor device according to any one of claims 1-4 above; The variable frequency compressor (11), the four-way valve (12), the outdoor unit heat exchanger (13), the first electronic expansion valve (16), the plate heat exchanger (14), and the liquid pipe shut-off valve (17) are connected in sequence through pipelines. The gas pipe shut-off valve (18), the four-way valve (12), the gas-liquid separator (15), and the variable frequency compressor (11) are connected in sequence. The liquid pipe shut-off valve (17) and the gas pipe shut-off valve (18) are both used to connect to the indoor unit. The variable frequency compressor (11), the four-way valve (12), the first electronic expansion valve (16), the liquid pipe shut-off valve (17), and the gas pipe shut-off valve (18) are all connected to the control device.

6. The multi-split air conditioning product circulation system according to claim 5, characterized in that, The variable frequency compressor (11) is equipped with a top temperature sensor (19) and an electric heating wire (20) inside. A high pressure switch (21) and an exhaust temperature sensor (22) are provided on the pipeline connecting the variable frequency compressor (11) and the four-way valve (12). The top temperature sensor (19), the electric heating wire (20), the high-voltage switch (21), and the exhaust temperature sensor (22) are all connected to the control device.

7. The multi-split air conditioning product circulation system according to claim 5, characterized in that, The outdoor unit heat exchanger (13) is equipped with an outdoor unit fan motor (23) and an outdoor temperature sensor (24). A condenser outlet temperature sensor (25) is provided on the pipeline used to connect the outdoor unit heat exchanger (13) and the first electronic expansion valve (16). The outdoor unit fan motor (23), the outdoor temperature sensor (24) and the condenser outlet temperature sensor (25) are all connected to the control device.

8. The multi-split air conditioning product circulation system according to claim 5, characterized in that, A first branch pipe, a second branch pipe, and a third branch pipe are provided between the plate heat exchanger (14) and the liquid pipe shut-off valve (17). The first branch pipe and the second branch pipe are distributed in parallel and are connected in series with the third branch pipe. The third branch pipe is connected to the liquid pipe shut-off valve (17). The second branch pipe is equipped with a second electronic expansion valve (26) and an inlet temperature sensor (27), and the third branch pipe is equipped with a liquid pipe temperature sensor (28). The second electronic expansion valve (26), the inlet temperature sensor (27) and the liquid pipe temperature sensor (28) are all connected to the control device.

9. The multi-split air conditioning product circulation system according to claim 5, characterized in that, An outlet temperature sensor (29) and a bypass valve (30) are provided on the pipeline used to connect the plate heat exchanger (14) and the gas-liquid separator (15). The outlet temperature sensor (29) and the bypass valve (30) are both connected to the control device.

10. The multi-split air conditioning product circulation system according to claim 5, characterized in that, A fourth branch pipe and a fifth branch pipe are provided between the variable frequency compressor (11) and the gas-liquid separator (15), and a low pressure sensor (31) is provided on the fifth branch pipe; A solenoid valve (32) is provided on the pipeline used to connect the variable frequency compressor (11) and the plate heat exchanger (14), and a suction temperature sensor (33) is provided on the pipeline used to connect the four-way valve (12) and the gas-liquid separator (15). The low-pressure sensor (31), the solenoid valve (32), and the intake temperature sensor (33) are all connected to the control device.

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