Back pressure regulating device, scroll compressor, refrigeration system and back pressure regulating method

Abstract

The application provides a back pressure regulating device, a scroll compressor, a refrigeration system and a back pressure regulating method. The device comprises a base body, a piston and a pressure reducing assembly. The base body has a cavity, and the piston is arranged in the cavity and is in sliding sealing with the cavity. The piston separates the cavity into a first pressure regulating area and a second pressure regulating area. The base body has a low pressure inlet connected with the first pressure regulating area, a back pressure outlet connected with the second pressure regulating area and a plurality of high pressure inlets. The plurality of high pressure inlets are arranged at intervals along the axial direction of the base body, and each high pressure inlet is connected with a different pressure reducing assembly. The low pressure inlet is connected with the suction port or the enthalpy increasing port of the equipment, the high pressure inlet is connected with the exhaust port of the equipment through the pressure reducing assembly, and the back pressure outlet is connected with the back pressure cavity of the equipment. The device can generate appropriate back pressure according to the suction pressure or the enthalpy increasing pressure, the exhaust pressure under the current working condition, and the back pressure is automatically adjusted with the working condition, so that the reliable operation of the scroll compressor is ensured, and the poor sealing or abnormal wear between the dynamic scroll and the static scroll during the operation is avoided.

Description

Technical Field

[0001] This invention relates to the field of compressor technology, and in particular to a back pressure regulating device, a scroll compressor, a refrigeration system, and a back pressure regulating method. Background Technology

[0002] Traditional air conditioning compressor refrigerants such as Freon, R134a, and R410a all cause some degree of environmental pollution. Compared to conventional refrigerants, carbon dioxide refrigerant has the advantages of being green, environmentally friendly, pollution-free, economical, and durable. To reduce environmental harm, carbon dioxide refrigerant has stood out among many refrigerants. However, the characteristics of carbon dioxide refrigerant dictate that it must operate under high pressure. The operating pressure of scroll compressors using carbon dioxide as a refrigerant is typically several times, or even ten times, higher than that of traditional refrigerant compressors.

[0003] A scroll compressor is a positive displacement compressor, with its compression component consisting of a moving scroll and a stationary scroll. The moving and stationary scrolls rotate relative to each other to compress the intake chamber, thus generating compressed gas. At high speeds, the pressure within the compression chamber of a scroll compressor is high, which can easily cause the moving and stationary scrolls to separate due to impact, resulting in axial leakage. A common solution is to install a back pressure chamber on the back of the moving scroll, channeling the exhaust pressure or compression chamber pressure to the back of the moving scroll as back pressure to counteract the enormous impact force within the compression chamber.

[0004] The pressure range within the compression chamber varies greatly under different operating conditions. If the back pressure is too high, there will be a large contact force between the moving and stationary scrolls. Although this ensures sealing, the translational motion between the moving and stationary scrolls will generate significant frictional power consumption, leading to accelerated wear of parts and reduced compressor efficiency. If the back pressure is too low, the sealing force between the moving and stationary scrolls will be insufficient, causing leakage in the compression chamber between the moving and stationary scrolls. This results in reduced refrigerant flow, increased power consumption, and ultimately reduced compressor efficiency. Summary of the Invention

[0005] To overcome the problems existing in related technologies, the present invention provides a back pressure regulating device, a scroll compressor, a refrigeration system, and a back pressure regulating method. The back pressure regulating device can generate a suitable back pressure according to the suction pressure or enthalpy increase pressure and the exhaust pressure under the current operating conditions. The back pressure is related to the suction pressure or enthalpy increase pressure and the exhaust pressure.

[0006] One of the objectives of this invention is to provide a back pressure regulating device:

[0007] Includes the base, piston, and pressure-reducing assembly;

[0008] The matrix has a cavity, the piston is disposed in the cavity, and the periphery of the piston slides and seals with the cavity;

[0009] The piston divides the interior of the cavity into a first pressure regulating zone and a second pressure regulating zone. The base has a low-pressure inlet communicating with the first pressure regulating zone, a back pressure outlet communicating with the second pressure regulating zone, and several high-pressure inlets.

[0010] Several high-pressure inlets are spaced apart along the axial direction of the substrate, and each high-pressure inlet is connected to a different step-down component.

[0011] Except for the high-pressure inlet furthest from the piston, the other high-pressure inlets can be blocked by the piston.

[0012] It should be noted that the piston can move axially along the base and has two extreme positions. In the first extreme position, all high-pressure inlets are connected to the second pressure regulating zone. In the second extreme position, only the high-pressure inlet furthest from the piston is connected to the second pressure regulating zone; the remaining high-pressure inlets are blocked by the piston. All high-pressure inlets are connected in parallel; the more high-pressure inlets connected, the lower the pressure entering the second pressure regulating zone.

[0013] In a preferred embodiment of the present invention, the low-pressure inlet is located at the top of the substrate, the back pressure outlet is located at the bottom of the substrate, and the high-pressure inlet is located on the periphery of the substrate.

[0014] In a preferred embodiment of the present invention, the piston top surface is connected to the inner top surface of the cavity via a spring.

[0015] In a preferred embodiment of the present invention, the voltage-reducing component is a wool tube.

[0016] The second objective of this invention is to provide a scroll compressor:

[0017] Including the aforementioned back pressure regulating device;

[0018] The suction port of the scroll compressor is connected to the low-pressure inlet of the back pressure regulating device, the discharge port of the scroll compressor is connected to the high-pressure inlet of the back pressure regulating device via a pressure-reducing component, and the back pressure chamber of the scroll compressor is connected to the back pressure outlet of the back pressure regulating device.

[0019] The third objective of this invention is to provide a refrigeration system:

[0020] This includes the evaporator, condenser, economizer, and the aforementioned scroll compressor;

[0021] The exhaust port of the scroll compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the economizer via a first throttle valve, the gas outlet of the economizer is connected to the low-pressure inlet of the back pressure regulating device via a first valve, the liquid outlet of the economizer is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the suction port of the scroll compressor.

[0022] The gas outlet of the economizer is the enthalpy-increasing port;

[0023] The suction port of the scroll compressor is connected to the low-pressure inlet of the back pressure regulating device via a second valve;

[0024] The back pressure chamber of the scroll compressor is connected to the back pressure outlet of the back pressure regulating device;

[0025] The exhaust port of the scroll compressor is connected to the high-pressure inlet of the back pressure regulating device via a pressure-reducing assembly.

[0026] It should be noted that the first and second valves will not open simultaneously; when one valve is open, the other will be closed. Specifically, when the first valve is open, the system is in an enthalpy-increasing state; when the second valve is open, the system is in a non-enthalpy-increasing state.

[0027] Specifically, when the first valve is opened, the system is in an enthalpy-increasing state. The high-temperature, high-pressure gaseous refrigerant output from the scroll compressor's exhaust port enters the condenser, where it condenses into a high-pressure liquid refrigerant. After passing through the first throttling valve, it becomes a low-pressure liquid refrigerant and enters the economizer. In the economizer, a portion of the refrigerant is throttled and evaporated to absorb heat, thereby subcooling the remaining refrigerant. The liquid refrigerant output from the economizer enters the evaporator and transforms into a low-temperature, low-pressure gaseous refrigerant, which then enters the scroll compressor through its suction port. Simultaneously, the gas outlet of the economizer and the exhaust port of the scroll compressor are connected to a back pressure regulating device, which links the back pressure to the enthalpy-increasing pressure and the exhaust pressure, enabling the back pressure to be adjusted according to the operating conditions and automatically generating a suitable back pressure.

[0028] Specifically, when the second valve is open, the system is in a non-enthalpy-increasing state; the high-temperature, high-pressure gaseous refrigerant output from the scroll compressor's exhaust port enters the condenser, condenses into a high-pressure liquid refrigerant, and then, after passing through the first throttle valve, becomes a low-pressure liquid refrigerant that enters the economizer. The liquid refrigerant output from the economizer enters the evaporator and is transformed into a low-temperature, low-pressure gaseous refrigerant, which then enters through the scroll compressor's suction port. At the same time, the scroll compressor's suction port and exhaust port are connected to a back pressure regulating device, which correlates the back pressure with the suction pressure and exhaust pressure, enabling the back pressure to be adjustable according to the operating conditions and automatically adjusting to generate a suitable back pressure.

[0029] Preferably, both the first and second valves are solenoid valves, so that the controller of the refrigeration system can control them.

[0030] Preferably, the economizer is a flash economizer.

[0031] In a preferred embodiment of the present invention, the liquid outlet of the economizer is connected to the inlet of the evaporator via a second throttle valve.

[0032] In a preferred embodiment of the present invention, the outlet of the first throttle valve is connected to the inlet of the economizer via a third valve;

[0033] The outlet of the first throttle valve is connected to the inlet of the evaporator via the fourth valve.

[0034] It should be noted that the third and fourth valves will not open simultaneously; when one valve is open, the other will be closed. Specifically, when the third valve is open, the system is in an enthalpy-increasing state; when the fourth valve is open, the system is in a non-enthalpy-increasing state. This design simplifies the system structure in the non-enthalpy-increasing state.

[0035] In a preferred embodiment of the present invention, a controller is also included, which is used to acquire the operating status of the refrigeration system and control the opening and closing of the valves;

[0036] The refrigeration system is in a state of increasing enthalpy and a state of not increasing enthalpy.

[0037] The first valve, the second valve, the third valve, and the fourth valve are all solenoid valves, and each valve is connected to the controller via communication.

[0038] The fourth objective of this invention is to provide a back pressure regulation method:

[0039] The method for regulating the back pressure of the scroll compressor in the above-mentioned refrigeration system includes the following steps:

[0040] The operating status of the refrigeration system is obtained, including enthalpy-increasing and non-enthalpy-increasing states.

[0041] If the refrigeration system is in an enthalpy-increasing state, open the first valve and close the second valve;

[0042] If the refrigeration system is in a non-enthalpy-increasing state, open the second valve and close the first valve.

[0043] Specifically, the refrigeration system has a controller, which takes the operating status of the refrigeration system into account and controls the opening and closing of the first and second valves.

[0044] In practical applications, the outlet of the first throttle valve of the refrigeration system can have two flow directions;

[0045] One path connects the outlet of the first throttle valve to the inlet of the economizer via the third valve;

[0046] The other route connects the outlet of the first throttle valve to the inlet of the evaporator via the fourth valve;

[0047] Under enthalpy-increasing conditions, the first and third valves will be opened, and the second and fourth valves will be closed.

[0048] In a non-enthalpy-increasing state, the second and fourth valves will open, while the first and third valves will close.

[0049] The beneficial effects of this invention are as follows:

[0050] When in use, this device connects the low-pressure inlet to the suction port of the scroll compressor or the enthalpy-increasing port of the economizer, the high-pressure inlet to the discharge port of the scroll compressor via a pressure-reducing component, and the back pressure outlet to the back pressure chamber of the scroll compressor. This back pressure regulating device can generate a suitable back pressure according to the suction pressure or enthalpy-increasing pressure and discharge pressure under the current operating conditions, so that the back pressure is related to the suction pressure or enthalpy-increasing pressure and discharge pressure. The back pressure can be automatically adjusted according to the operating conditions, which can ensure the reliable operation of the scroll compressor and avoid poor sealing or abnormal wear between the moving and stationary volutes due to unreasonable back pressure during operation.

[0051] When in use, the forces borne by the piston include a first force and a second force in opposite directions. The first force includes the piston's weight and the intake pressure or enthalpy increase pressure, while the second force is the exhaust pressure reduced by the pressure reducing component.

[0052] If the second force is greater than the first force, the piston will move upward, increasing the number of high-pressure inlets connected to further reduce the exhaust pressure until the piston stops moving due to the force balance inside the cavity. At this point, the pressure output from the back pressure outlet will decrease, thereby reducing the back pressure.

[0053] If the second force is less than the first force, the piston will move downward, reducing the number of high-pressure inlets connected to reduce the pressure reduction effect on the exhaust pressure, until the piston stops moving due to the force balance inside the cavity. At this point, the pressure output from the back pressure outlet will increase, thereby increasing the back pressure. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of connecting a single high-pressure inlet in a back pressure regulating device.

[0055] Figure 2 This is a schematic diagram of a back pressure regulating device that connects multiple high-pressure inlets.

[0056] Figure 3 This is a schematic diagram of a single high-pressure inlet connected in a back pressure regulating device with a spring.

[0057] Figure 4 This is a schematic diagram of a back pressure regulating device with springs connected to multiple high-pressure inlets.

[0058] Figure 5 This is a schematic diagram of a stepped structure design for a back pressure regulating device.

[0059] Figure 6 This is a structural diagram of a refrigeration system.

[0060] Figure 7 This is another implementation diagram of the refrigeration system.

[0061] Figure 8 This is a flowchart of the back pressure control method.

[0062] Figure label:

[0063] 100. Matrix; 110. Cavity; 120. Low-pressure inlet; 130. High-pressure inlet; 140. Back pressure outlet; 200. Piston; 300. Pressure reducing assembly; 400. Sealing ring; 500. Spring; 600. Refrigeration system; 601. Back pressure regulating device; 602. Scroll compressor; 603. Evaporator; 604. First throttle valve; 605. Economizer; 606. Second throttle valve; 607. Condenser; 608. First valve; 609. Second valve; 610. Third valve; 611. Fourth valve. Detailed Implementation

[0064] Preferred embodiments of the invention will now be described in more detail with reference to the accompanying drawings. While preferred embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the invention will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0065] A scroll compressor is a positive displacement compressor, with its compression component consisting of a moving scroll and a stationary scroll. The moving and stationary scrolls rotate relative to each other to compress the intake chamber, thus generating compressed gas. At high speeds, the pressure within the compression chamber of a scroll compressor is high, which can easily cause the moving and stationary scrolls to separate due to impact, resulting in axial leakage. A common solution is to install a back pressure chamber on the back of the moving scroll, channeling the exhaust pressure or compression chamber pressure to the back of the moving scroll as back pressure to counteract the enormous impact force within the compression chamber.

[0066] The pressure range within the compression chamber varies greatly under different operating conditions. If the back pressure is too high, there will be a large contact force between the moving and stationary scrolls. Although this ensures sealing, the translational motion between the moving and stationary scrolls will generate significant frictional power consumption, leading to accelerated wear of parts and reduced compressor efficiency. If the back pressure is too low, the sealing force between the moving and stationary scrolls will be insufficient, causing leakage in the compression chamber between the moving and stationary scrolls. This results in reduced refrigerant flow, increased power consumption, and ultimately reduced compressor efficiency.

[0067] Example 1

[0068] To address the aforementioned issues, Embodiment 1 provides a back pressure regulating device that can generate a suitable back pressure based on the intake pressure or enthalpy increase pressure and exhaust pressure under the current operating conditions. The back pressure is related to the intake pressure or enthalpy increase pressure and exhaust pressure.

[0069] like Figure 1-2 As shown, a back pressure regulating device:

[0070] Includes a base 100, a piston 200, and a pressure-reducing assembly 300;

[0071] The base 100 has a cavity 110, and the piston 200 is disposed in the cavity 110, with the periphery of the piston 200 slidingly sealed to the cavity 110;

[0072] The piston 200 divides the interior of the cavity 110 into a first pressure regulating zone and a second pressure regulating zone. The base 100 has a low-pressure inlet 120 communicating with the first pressure regulating zone, a back pressure outlet 140 communicating with the second pressure regulating zone, and a plurality of high-pressure inlets 130.

[0073] Several high-voltage inlets 130 are spaced apart along the axial direction of the base 100, and each high-voltage inlet 130 is connected to a different step-down component 300.

[0074] Except for the high-pressure inlet 130 furthest from the piston 200, the other high-pressure inlets 130 can be blocked by the piston 200.

[0075] It should be noted that the piston 200 can move axially along the base 100, and it has two extreme positions. When it is in the first extreme position, all the high-pressure inlets 130 are connected to the second pressure regulating zone. When it is in the second extreme position, only the high-pressure inlet 130 furthest from the piston 200 is connected to the second pressure regulating zone, and the other high-pressure inlets 130 are blocked by the piston 200. The high-pressure inlets 130 are connected in parallel, and the more high-pressure inlets 130 connected, the lower the pressure entering the second pressure regulating zone.

[0076] In this embodiment, the low-pressure inlet 120 is located at the top of the substrate 100, the back pressure outlet 140 is located at the bottom of the substrate 100, and the high-pressure inlet 130 is located on the periphery of the substrate 100.

[0077] In this embodiment, the voltage reduction component 300 is a yarn tube.

[0078] When in use, the low-pressure inlet 120 is connected to the suction port of the scroll compressor or the enthalpy-increasing port of the economizer 605, the high-pressure inlet 130 is connected to the discharge port of the scroll compressor via the pressure-reducing assembly 300, and the back pressure outlet 140 is connected to the back pressure chamber of the scroll compressor.

[0079] When in use, the forces borne by piston 200 include a first force and a second force in opposite directions. The first force includes the weight of piston 200 and the intake pressure or enthalpy increase pressure, and the second force is the exhaust pressure reduced by the pressure reducing component 300.

[0080] If the second force is greater than the first force, the piston 200 will move upward, increasing the number of high-pressure inlets 130 connected to further reduce the exhaust pressure until the piston 200 in the cavity 110 is in equilibrium and no longer moves. At this time, the pressure output from the back pressure outlet 140 will decrease, thereby reducing the back pressure.

[0081] If the second force is less than the first force, the piston 200 will move downward, reducing the number of high-pressure inlets 130 connected to, thereby reducing the pressure reduction effect on the exhaust pressure. This continues until the piston 200 stops moving due to the force balance within the cavity 110. At this point, the pressure output from the back pressure outlet 140 will increase, thereby increasing the back pressure.

[0082] This back pressure regulating device can generate appropriate back pressure based on the current suction pressure or enthalpy increase pressure and discharge pressure, making the back pressure related to the suction pressure or enthalpy increase pressure and discharge pressure. It can automatically adjust the compressor back pressure according to different operating conditions, reduce abnormal wear of the scroll compressor, improve the long-term reliability of the scroll compressor, and ensure reliable operation of the scroll compressor by adjusting the back pressure according to the operating conditions. It can also avoid poor sealing or abnormal wear between the moving and stationary volutes due to unreasonable back pressure during operation.

[0083] It should be noted that, in practical applications, the piston 200 and the cavity 110 are preferably designed in a cylindrical shape. Meanwhile, as... Figure 5 The cavity 110 can also be designed as a stepped shape with a large end and a small end. In this case, the piston 200 is also designed as a stepped shape with a large end and a small end to fit the cavity 110. At the same time, a sealing ring 400 is installed on the outer periphery of the large end of the piston 200.

[0084] Example 2

[0085] Furthermore, in Example 2, the back pressure regulating device is further designed based on the above examples.

[0086] like Figure 3-4 As shown, a back pressure regulating device:

[0087] Includes a base 100, a piston 200, and a pressure-reducing assembly 300;

[0088] The base 100 has a cavity 110, and the piston 200 is disposed in the cavity 110, with the periphery of the piston 200 slidingly sealed to the cavity 110;

[0089] The piston 200 divides the interior of the cavity 110 into a first pressure regulating zone and a second pressure regulating zone. The base 100 has a low-pressure inlet 120 communicating with the first pressure regulating zone, a back pressure outlet 140 communicating with the second pressure regulating zone, and a plurality of high-pressure inlets 130.

[0090] Several high-voltage inlets 130 are spaced apart along the axial direction of the base 100, and each high-voltage inlet 130 is connected to a different step-down component 300.

[0091] Except for the high-pressure inlet 130 furthest from the piston 200, the other high-pressure inlets 130 can be blocked by the piston 200;

[0092] The low-pressure inlet 120 is located at the top of the base 100, the back pressure outlet 140 is located at the bottom of the base 100, and the high-pressure inlet 130 is located on the periphery of the base 100;

[0093] The top surface of the piston 200 is connected to the top surface of the cavity 110 via a spring 500.

[0094] When in use, the forces borne by piston 200 include the first force, the second force and the elastic force of spring 500. The first force includes the weight of piston 200 and the intake pressure or enthalpy increase pressure. The second force is the exhaust pressure reduced by pressure reduction component 300.

[0095] If the combined force of the first force, the second force and the elastic force of the spring 500 in the cavity 110 is upward, the piston 200 will move upward, increasing the number of high pressure inlets 130 connected to further reduce the exhaust pressure until the piston 200 in the cavity 110 is no longer moving due to the force balance. At this time, the pressure output by the back pressure outlet 140 will decrease, thereby reducing the back pressure.

[0096] If the combined force of the first force, the second force, and the elastic force of the spring 500 in the cavity 110 is downward, the piston 200 will move downward, reducing the number of high-pressure inlets 130 connected to reduce the pressure reduction effect on the exhaust pressure, until the piston 200 in the cavity 110 is no longer moving due to the force balance. At this time, the pressure output by the back pressure outlet 140 will increase, thereby increasing the back pressure.

[0097] Example 3

[0098] Furthermore, in Embodiment 3, based on the above embodiments, the back pressure regulating device is externally installed on the scroll compressor, making the back pressure regulating device a component of the scroll compressor, thereby giving the scroll compressor a back pressure regulating function.

[0099] like Figure 1-5 As shown, a scroll compressor:

[0100] The device includes a back pressure regulating device, which comprises a base 100, a piston 200, and a pressure reducing assembly 300.

[0101] The base 100 has a cavity 110, and the piston 200 is disposed in the cavity 110, with the periphery of the piston 200 slidingly sealed to the cavity 110;

[0102] The piston 200 divides the interior of the cavity 110 into a first pressure regulating zone and a second pressure regulating zone. The base 100 has a low-pressure inlet 120 communicating with the first pressure regulating zone, a back pressure outlet 140 communicating with the second pressure regulating zone, and a plurality of high-pressure inlets 130.

[0103] Several high-voltage inlets 130 are spaced apart along the axial direction of the base 100, and each high-voltage inlet 130 is connected to a different step-down component 300.

[0104] Except for the high-pressure inlet 130 furthest from the piston 200, the other high-pressure inlets 130 can be blocked by the piston 200;

[0105] The low-pressure inlet 120 is located at the top of the base 100, the back pressure outlet 140 is located at the bottom of the base 100, and the high-pressure inlet 130 is located on the periphery of the base 100;

[0106] The top surface of the piston 200 is connected to the inner top surface of the cavity 110 via a spring 500;

[0107] The suction port of the scroll compressor is connected to the low-pressure inlet 120 of the back pressure regulating device, the discharge port of the scroll compressor is connected to the high-pressure inlet 130 of the back pressure regulating device via the pressure reducing assembly 300, and the back pressure chamber of the scroll compressor is connected to the back pressure outlet 140 of the back pressure regulating device.

[0108] When in use, the forces borne by piston 200 include the first force, the second force and the elastic force of spring 500. The first force includes the weight of piston 200 and the intake pressure or enthalpy increase pressure. The second force is the exhaust pressure reduced by pressure reduction component 300.

[0109] If the combined force of the first force, the second force and the elastic force of the spring 500 in the cavity 110 is upward, the piston 200 will move upward, increasing the number of high pressure inlets 130 connected to further reduce the exhaust pressure until the piston 200 in the cavity 110 is no longer moving due to the force balance. At this time, the pressure output by the back pressure outlet 140 will decrease, thereby reducing the back pressure.

[0110] If the combined force of the first force, the second force, and the elastic force of the spring 500 in the cavity 110 is downward, the piston 200 will move downward, reducing the number of high-pressure inlets 130 connected to reduce the pressure reduction effect on the exhaust pressure, until the piston 200 in the cavity 110 is no longer moving due to the force balance. At this time, the pressure output by the back pressure outlet 140 will increase, thereby increasing the back pressure.

[0111] In this scroll compressor, the back pressure is related to the suction pressure or enthalpy increase pressure and the discharge pressure. It can generate a suitable back pressure according to the suction pressure or enthalpy increase pressure and the discharge pressure under the current operating conditions. During use, the back pressure can be automatically adjusted according to different operating conditions, which can reduce abnormal wear of the scroll compressor and improve the long-term reliability of the scroll compressor. The back pressure is adjustable with the operating conditions, which can ensure the reliable operation of the scroll compressor and avoid poor sealing or abnormal wear between the moving and stationary volutes due to unreasonable back pressure during operation.

[0112] Example 4

[0113] Furthermore, in Example 4, based on the above examples, the back pressure regulating device and the scroll compressor are applied to the refrigeration system 600.

[0114] like Figure 6 As shown, a refrigeration system 600 is provided:

[0115] It includes an evaporator 603, a condenser 607, an economizer 605, a scroll compressor 602, and a back pressure regulating device 601;

[0116] The back pressure regulating device 601 includes a base 100, a piston 200, and a pressure reducing assembly 300;

[0117] The base 100 has a cavity 110, and the piston 200 is disposed in the cavity 110, with the periphery of the piston 200 slidingly sealed to the cavity 110;

[0118] The piston 200 divides the interior of the cavity 110 into a first pressure regulating zone and a second pressure regulating zone. The base 100 has a low-pressure inlet 120 communicating with the first pressure regulating zone, a back pressure outlet 140 communicating with the second pressure regulating zone, and a plurality of high-pressure inlets 130.

[0119] Several high-voltage inlets 130 are spaced apart along the axial direction of the base 100, and each high-voltage inlet 130 is connected to a different step-down component 300.

[0120] Except for the high-pressure inlet 130 furthest from the piston 200, the other high-pressure inlets 130 can be blocked by the piston 200;

[0121] The low-pressure inlet 120 is located at the top of the base 100, the back pressure outlet 140 is located at the bottom of the base 100, and the high-pressure inlet 130 is located on the periphery of the base 100;

[0122] The top surface of the piston 200 is connected to the inner top surface of the cavity 110 via a spring 500;

[0123] The exhaust port of the scroll compressor 602 is connected to the inlet of the condenser 607. The outlet of the condenser 607 is connected to the inlet of the economizer 605 via the first throttle valve 604. The gas outlet of the economizer 605 is connected to the low-pressure inlet 120 of the back pressure regulating device via the first valve 608. The liquid outlet of the economizer 605 is connected to the inlet of the evaporator 603. The outlet of the evaporator 603 is connected to the suction port of the scroll compressor 602.

[0124] The gas outlet of the economizer 605 is the enthalpy-increasing port;

[0125] The suction port of the scroll compressor 602 is connected to the low-pressure inlet 120 of the back pressure regulating device via the second valve 609;

[0126] The back pressure chamber of the scroll compressor 602 is connected to the back pressure outlet 140 of the back pressure regulating device;

[0127] The exhaust port of the scroll compressor 602 is connected to the high-pressure inlet 130 of the back pressure regulating device via the pressure reduction assembly 300.

[0128] It should be noted that the first valve 608 and the second valve 609 will not open simultaneously; when one valve is open, the other valve will be closed.

[0129] Specifically, when the first valve 608 is opened, the system is in an enthalpy-increasing state. The high-temperature, high-pressure gaseous refrigerant output from the exhaust port of the scroll compressor 602 enters the condenser 607, where it condenses into a high-pressure liquid refrigerant. After passing through the first throttling valve 604, it becomes a low-pressure liquid refrigerant and enters the economizer 605. In the economizer 605, a portion of the refrigerant is throttled and evaporated to absorb heat, thereby subcooling the remaining refrigerant. The liquid refrigerant output from the economizer 605 enters the evaporator 603 and is transformed into a low-temperature, low-pressure gaseous refrigerant, which then enters the scroll compressor 602 through the suction port. Simultaneously, the gas outlet of the economizer 605 and the exhaust port of the scroll compressor 602 are connected to the back pressure regulating device 601, which links the back pressure to the enthalpy-increasing pressure and the exhaust pressure, enabling the back pressure to be adjusted according to the operating conditions and automatically generating a suitable back pressure.

[0130] Specifically, when the second valve 609 is open, the system is in a non-enthalpy-increasing state; the high-temperature, high-pressure gaseous refrigerant output from the exhaust port of the scroll compressor 602 enters the condenser 607, condenses into a high-pressure liquid refrigerant, and then becomes a low-pressure liquid refrigerant after passing through the first throttle valve 604 and enters the economizer 605. The liquid refrigerant output from the economizer 605 enters the evaporator 603 and is transformed into a low-temperature, low-pressure gaseous refrigerant, which then enters through the suction port of the scroll compressor 602; at the same time, the suction port and exhaust port of the scroll compressor 602 are connected to the back pressure regulating device 601, which correlates the back pressure with the suction pressure and the exhaust pressure, so that the back pressure can be adjusted according to the operating conditions and automatically adjusts to generate a suitable back pressure.

[0131] Preferably, both the first valve 608 and the second valve 609 are solenoid valves, so that they can be controlled by the controller of the refrigeration system 600.

[0132] Preferably, the economizer 605 is a flash economizer 605.

[0133] In this embodiment, as Figure 5 As shown, the liquid outlet of the economizer 605 is connected to the inlet of the evaporator 603 via the second throttle valve 606.

[0134] In this embodiment, as Figure 6 As shown, the outlet of the first throttle valve 604 is connected to the inlet of the economizer 605 via the third valve 610;

[0135] The outlet of the first throttle valve 604 is connected to the inlet of the evaporator 603 via the fourth valve 611.

[0136] It should be noted that the third valve 610 and the fourth valve 611 will not open simultaneously; when one valve is open, the other will be closed. Specifically, when the third valve 610 is open, the system is in an enthalpy-increasing state; when the fourth valve 611 is open, the system is in a non-enthalpy-increasing state. This design simplifies the system structure in the non-enthalpy-increasing state.

[0137] In this embodiment, the refrigeration system 600 also includes a controller, which is used to acquire the operating status of the refrigeration system 600 and control the opening and closing of the valves;

[0138] The refrigeration system 600 has states including an enthalpy-increasing state and a non-enthalpy-increasing state.

[0139] The first valve 608, the second valve 609, the third valve 610 and the fourth valve 611 are all solenoid valves, and each valve is connected to the controller via communication.

[0140] Example 5

[0141] Furthermore, in Example 5, based on the above examples, a back pressure control method is provided to correlate the back pressure with the intake pressure and exhaust pressure or with the enthalpy increase pressure and exhaust pressure according to the operating conditions and whether enthalpy is increased, so as to realize that the back pressure can be adjusted according to the operating conditions and automatically adjust to generate a suitable back pressure.

[0142] like Figure 8 As shown, a back pressure regulation method:

[0143] The method for regulating the back pressure of the scroll compressor 602 in the aforementioned refrigeration system 600 includes the following steps:

[0144] S100 acquires the operating status of the refrigeration system 600, the operating status including enthalpy increase state and non-enthalpy increase state;

[0145] S101 If the refrigeration system 600 is in an enthalpy-increasing state, then open the first valve 608 and close the second valve 609;

[0146] If the refrigeration system 600 is in a non-enthalpy-increasing state, then open the second valve 609 and close the first valve 608.

[0147] In this embodiment, the refrigeration system 600 has a controller, which takes the operating state of the refrigeration system 600 and controls the opening and closing of the first valve 608 and the second valve 609.

[0148] In practical applications, the outlet of the first throttling valve 604 of the refrigeration system 600 can have two flow directions;

[0149] One path connects the outlet of the first throttle valve 604 to the inlet of the economizer 605 via the third valve 610;

[0150] The other route connects the outlet of the first throttle valve 604 to the inlet of the evaporator 603 via the fourth valve 611;

[0151] Under enthalpy-increasing conditions, the first valve 608 and the third valve 610 will be opened, while the second valve 609 and the fourth valve 611 will be closed.

[0152] In a non-enthalpy-increasing state, the second valve 609 and the fourth valve 611 will be opened, while the first valve 608 and the third valve 610 will be closed.

[0153] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0154] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal direction, vertical, vertical, horizontal" and "top, bottom" are generally based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0155] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A back pressure regulating device, characterized in that: Includes the base, piston, and pressure-reducing assembly; The matrix has a cavity, the piston is disposed in the cavity, and the periphery of the piston slides and seals with the cavity; The piston divides the interior of the cavity into a first pressure regulating zone and a second pressure regulating zone. The base has a low-pressure inlet communicating with the first pressure regulating zone, a back pressure outlet communicating with the second pressure regulating zone, and several high-pressure inlets. Several high-pressure inlets are spaced apart along the axial direction of the substrate, and each high-pressure inlet is connected to a different step-down component. The voltage-reducing component is a wool tube; The piston can move along the axial direction of the base body and has two extreme positions. When it is in the first extreme position, all high-pressure inlets are connected to the second pressure regulating zone. When it is in the second extreme position, only the high-pressure inlet furthest from the piston is connected to the second pressure regulating zone, and the other high-pressure inlets are blocked by the piston. All high-pressure inlets are connected in parallel. The more high-pressure inlets connected, the lower the pressure entering the second pressure regulating zone.

2. The back pressure regulating device according to claim 1, characterized in that: The low-pressure inlet is located at the top of the substrate, the back pressure outlet is located at the bottom of the substrate, and the high-pressure inlet is located on the periphery of the substrate.

3. The back pressure regulating device according to claim 2, characterized in that: The top surface of the piston is connected to the top surface inside the cavity via a spring.

4. A scroll compressor, characterized in that: Includes the back pressure regulating device as described in any one of claims 1-3; The suction port of the scroll compressor is connected to the low-pressure inlet of the back pressure regulating device, the discharge port of the scroll compressor is connected to the high-pressure inlet of the back pressure regulating device via a pressure-reducing component, and the back pressure chamber of the scroll compressor is connected to the back pressure outlet of the back pressure regulating device.

5. A refrigeration system, characterized in that: Includes an evaporator, a condenser, an economizer, and the scroll compressor as described in claim 4; The exhaust port of the scroll compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the economizer via a first throttle valve, the gas outlet of the economizer is connected to the low-pressure inlet of the back pressure regulating device via a first valve, the liquid outlet of the economizer is connected to the inlet of the evaporator, and the outlet of the evaporator is connected to the suction port of the scroll compressor. The suction port of the scroll compressor is connected to the low-pressure inlet of the back pressure regulating device via a second valve.

6. The refrigeration system according to claim 5, characterized in that: The liquid outlet of the economizer is connected to the inlet of the evaporator via a second throttle valve.

7. The refrigeration system according to claim 5, characterized in that: The outlet of the first throttle valve is connected to the inlet of the economizer via the third valve; The outlet of the first throttle valve is connected to the inlet of the evaporator via the fourth valve.

8. The refrigeration system according to claim 7, characterized in that: It also includes a controller, which is used to obtain the operating status of the refrigeration system and control the opening and closing of the valves; The first valve, the second valve, the third valve, and the fourth valve are all solenoid valves, and each valve is connected to the controller via communication.

9. A back pressure regulation method, characterized in that: Used to regulate the back pressure of the scroll compressor in the refrigeration system according to any one of claims 6-8; Includes the following steps: The operating status of the refrigeration system is obtained, including enthalpy-increasing and non-enthalpy-increasing states. If the refrigeration system is in an enthalpy-increasing state, open the first valve and close the second valve; If the refrigeration system is in a non-enthalpy-increasing state, open the second valve and close the first valve.

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