A control method and air conditioning system

Abstract

This invention provides a control method and air conditioning system, relating to the field of air conditioning technology, and solves the technical problem that air conditioners cannot perform reversing defrosting without shutting down. The system includes a compressor, a first four-way valve, an indoor unit, a throttling valve, and an outdoor unit connected sequentially via refrigerant piping; it also includes a liquid storage unit with one end connected to the compressor's exhaust port and the other end connected to the refrigerant piping between the indoor and outdoor units. The liquid storage unit includes a liquid storage tank, an inlet airflow path, a liquid inflow path, an outlet liquid flow path, and solenoid valves disposed on all the flow paths. One end of the inlet airflow path is connected to the liquid storage tank, and the other end is connected to the compressor's exhaust port; one end of the liquid inflow path is connected to the liquid storage tank, and the other end is connected to the refrigerant piping between the indoor unit and the throttling valve; one end of the outlet liquid flow path is connected to the liquid storage tank, and the other end is connected to the refrigerant piping between the outdoor unit and the throttling valve. This invention enables defrosting without shutting down, significantly shortens defrosting time, and improves heating efficiency.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an air conditioning system with a non-stop defrosting control method and an air conditioning system. Background Technology

[0002] Defrosting is a critical issue for air conditioners during low-temperature heating. The current conventional defrosting method involves: first, stopping the compressor; then, after the pressure at the compressor's suction and discharge ports equalizes, de-energizing the four-way reversing valve and switching it to the desired direction; finally, starting the compressor again to increase the outdoor pressure and initiate defrosting. After defrosting, the compressor needs to be stopped again, and then the four-way reversing valve is energized to switch back to heating mode. This defrosting method requires two shutdowns per heating-defrosting cycle, resulting in a smaller proportion of heating time and lower average heating capacity. This is especially problematic for high-speed compressors, as their frequency ramp-up rate is limited, leading to longer ramp-up times during mode transitions and even worse low-temperature heating performance. Therefore, if the compressor could operate at high speed while the four-way reversing valve is switching, it would significantly improve heating efficiency.

[0003] There are two main difficulties to overcome in defrosting a compressor without stopping it: First, after the four-way reversing valve switches, the compressor's discharge line connects to the low-pressure line, and the suction line connects to the high-pressure line, creating a reverse pressure difference. This reverse pressure difference makes the compressor unstable and may even damage it. It also affects the reliability of the four-way reversing valve, reducing its lifespan. Second, there is a large amount of liquid refrigerant on the high-pressure side. If the compressor switches without stopping, the liquid refrigerant will enter the compressor through the suction port, causing liquid slugging and resulting in malfunction. Summary of the Invention

[0004] The purpose of this invention is to provide a method for controlling defrosting without stopping an air conditioning system and an air conditioning system, so as to solve the technical problem that air conditioners in the prior art cannot perform reversing defrosting without stopping the system.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The present invention provides an air conditioning system comprising a compressor, a first four-way valve, an indoor unit, a throttling valve, and an outdoor unit connected sequentially via refrigerant piping; and a liquid storage unit, one end of which is connected to the compressor's exhaust port, and the other end of which is connected to the refrigerant piping between the indoor unit and the outdoor unit; the liquid storage unit includes a liquid storage tank, an inlet air path, a liquid inlet flow path, a liquid outlet flow path, and solenoid valves disposed on all flow paths; wherein:

[0007] One end of the air intake path is connected to the liquid storage tank, and the other end is connected to the exhaust port of the compressor;

[0008] One end of the liquid inlet flow path is connected to the liquid storage tank, and the other end is connected to the refrigerant pipeline between the indoor unit and the throttling valve;

[0009] One end of the liquid outlet path is connected to the liquid storage tank, and the other end is connected to the refrigerant pipeline between the outdoor unit and the throttling valve.

[0010] This invention addresses the problem of liquid slugging caused by the compressor drawing in large amounts of liquid during the defrosting process by setting up a liquid storage unit. This is achieved by storing liquid refrigerant in a tank during the heating / defrosting mode transition, thus significantly shortening defrosting time and reducing the start-up time for heating cycles, thereby improving heating efficiency. Furthermore, by connecting a pressure stabilizing unit to the compressor's suction and discharge sides, the unit can be activated before defrosting, balancing the compressor's suction and discharge pressures. This ensures the pressures on both sides are close and balanced before the first four-way valve switches, preventing excessive pressure difference between suction and discharge that could damage the compressor. Reduced suction and discharge pressure effectively solves the problem of reverse pressure differentials damaging the compressor during heating / defrosting transitions, preventing the four-way reversing valve from becoming unreliable and reducing its lifespan due to reverse pressure differences, and preventing liquid refrigerant from entering the compressor through the suction port, thus avoiding liquid slugging and subsequent malfunctions.

[0011] Based on the above technical solution, the present invention can be further improved as follows.

[0012] As a further improvement of the present invention, the liquid storage tank is a rotary core type liquid storage tank, including a shell, an upper straight pipe, a first lower straight pipe, a second lower straight pipe, a partition, and a servo motor; wherein:

[0013] The servo motor is mounted on the top of the housing and is connected to the partition located in the inner cavity of the housing, enabling the partition to rotate horizontally. The partition divides the inner cavity of the housing into two chambers, namely a first chamber and a second chamber. The tops of the first chamber and the second chamber are connected. The upper straight pipe is located on the top of the housing and communicates with the first chamber. The first lower straight pipe is located on the bottom of the housing and communicates with the first chamber. The second lower straight pipe is located on the bottom of the housing and communicates with the second chamber.

[0014] The liquid storage tank includes a second liquid storage tank, which has a hollow tank structure and an internal storage cavity; the air inlet path is connected to the top of the second liquid storage tank; the liquid inlet pipe and the liquid outlet pipe are both connected to the bottom of the second liquid storage tank.

[0015] It also includes a pressure stabilizing unit connected to the compressor's suction and discharge ports respectively, so as to achieve pressure balance on both sides of the compressor's suction and discharge ports. The pressure stabilizing unit includes a first pressure stabilizing bypass and a first pressure stabilizing solenoid valve. The two ends of the pressure stabilizing bypass are respectively connected to the refrigerant lines of the compressor's suction and discharge ports. The first pressure stabilizing solenoid valve is disposed on the first pressure stabilizing bypass.

[0016] It also includes a pressure stabilizing unit connected to the compressor's intake and exhaust ports respectively, so as to achieve pressure balance on both sides of the compressor's intake and exhaust ports. The pressure stabilizing unit includes a second pressure stabilizing bypass and a second pressure stabilizing solenoid valve. One end of the second pressure stabilizing bypass is connected to the compressor's intake port, and the other end is connected to the top of the second liquid storage tank. The second pressure stabilizing solenoid valve is disposed on the second pressure stabilizing bypass.

[0017] The present invention provides a control method for defrosting an air conditioning system without shutting it down, the method comprising at least the following steps:

[0018] The air conditioning system is switched to heating mode and the voltage regulator unit is turned off.

[0019] When defrosting is required, some solenoid valves in the liquid receiver unit are opened and others are closed to draw liquid refrigerant from the indoor unit side and store it in the liquid receiver tank when the air conditioner is heating; then the pressure stabilizing unit is opened to balance the pressure on both sides of the compressor's suction and discharge ports, completing the preparations before defrosting.

[0020] After completing the defrosting preparations, the first four-way valve reverses without stopping the machine, then the pressure regulating unit is closed, and another solenoid valve in the liquid receiver unit is opened while some solenoid valves are closed. This allows the high-pressure gaseous refrigerant at the compressor exhaust port to push the liquid refrigerant in the liquid receiver tank out into the outdoor unit. The liquid refrigerant then mixes with the refrigerant that enters the outdoor unit through the four-way valve at the compressor exhaust port, thus starting the outdoor unit defrosting process.

[0021] After defrosting is complete, turn off the liquid storage unit and turn on the pressure stabilizing unit to balance the pressure on both sides of the compressor's suction and discharge ports, thus completing the heating preparation.

[0022] After completing the heating preparation, the first four-way valve reverses without stopping the machine, then the pressure stabilizing unit is shut off, and normal heating begins. Attached Figure Description

[0023] 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1This is a system composition diagram of one embodiment of the air conditioning system of the present invention;

[0025] Figure 2 This is a system composition diagram of the second embodiment of the air conditioning system of the present invention;

[0026] Figure 3 This is a system composition diagram of the third embodiment of the air conditioning system of the present invention;

[0027] Figure 4 This is a perspective structural diagram of a rotating core liquid storage tank in one embodiment of the air conditioning system of the present invention;

[0028] Figure 5 This is a control flowchart of the control method of the present invention;

[0029] Figure 6 This is a control flowchart of one implementation of the control method of the present invention.

[0030] In the picture:

[0031] 1. Compressor;

[0032] 2. First four-way valve;

[0033] 3. Indoor unit;

[0034] 4. Throttling valve;

[0035] 5. Outdoor unit;

[0036] 6. Rotary core type liquid storage tank;

[0037] 8. Second liquid storage tank;

[0038] 9. Pressure stabilizing pump;

[0039] 21. Second four-way valve;

[0040] 101. Exhaust pressure sensor;

[0041] 102. Inhalation pressure sensor;

[0042] 61. Servo motor;

[0043] 62. Install a straight pipe;

[0044] 63. Shell;

[0045] 64. First straight pipe;

[0046] 65. Second straight pipe;

[0047] 66. Partition;

[0048] 71. Third solenoid valve;

[0049] 72. Fourth solenoid valve;

[0050] 73. The seventh solenoid valve;

[0051] 74. First pressure-regulating solenoid valve;

[0052] 75. Second pressure-regulating solenoid valve;

[0053] 76. The eighth solenoid valve;

[0054] 77. Fifth solenoid valve;

[0055] 78. The sixth solenoid valve. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be described in detail below. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0057] like Figure 1 As shown, this invention provides an air conditioning system, including a compressor 1, a first four-way valve 2, an indoor unit 3, a throttle valve 4, and an outdoor unit 5 connected sequentially via refrigerant piping; it also includes a pressure stabilizing unit connected to the suction and discharge ports of the compressor 1 respectively, to achieve pressure balance on both sides of the suction and discharge ports of the compressor 1. It should be noted that, in this embodiment, to shorten defrosting time, a liquid storage unit is also included, with one end connected to the discharge port of the compressor 1 and the other end connected to the refrigerant piping between the indoor unit 3 and the outdoor unit 5.

[0058] Specifically, the liquid storage unit includes a liquid storage tank, an air inlet path, a liquid inlet path, a liquid outlet path, and solenoid valves installed on all the flow paths; wherein:

[0059] One end of the air intake path is connected to the liquid storage tank, and the other end is connected to the compressor's exhaust port;

[0060] One end of the liquid inlet flow path is connected to the liquid storage tank, and the other end is connected to the refrigerant line between the indoor unit and the expansion valve;

[0061] One end of the liquid outlet is connected to the liquid storage tank, and the other end is connected to the refrigerant pipeline between the outdoor unit and the expansion valve.

[0062] This invention connects a pressure stabilizing unit to the suction and discharge sides of compressor 1. Before defrosting, the pressure stabilizing unit is activated, balancing the suction and discharge pressures of compressor 1. This ensures the suction and discharge pressures are close and balanced. Then, the first four-way valve 2 switches, preventing excessive pressure difference between suction and discharge, which could damage compressor 1. The reduced pressure effectively solves the problem of reverse pressure difference damaging compressor 1 during heating / defrosting transitions, and avoids the issues of poor reliability and reduced lifespan of the four-way reversing valve caused by reverse pressure difference. Furthermore, by incorporating a liquid storage unit, refrigerant migration during heating / defrosting mode switching is controlled, improving heating efficiency and preventing liquid refrigerant from entering compressor 1 through the suction port, thus preventing liquid slugging and subsequent malfunction.

[0063] Example 1:

[0064] In this embodiment, the air conditioning system includes a compressor 1, a first four-way valve 2, an indoor unit 3, a throttle valve 4, and an outdoor unit 5 connected in sequence via refrigerant pipelines;

[0065] Furthermore, in this embodiment, the liquid storage unit includes a rotary core type liquid storage tank 6, a third solenoid valve 71, a fourth solenoid valve 72, a seventh solenoid valve 73, a first air inlet flow path, a first liquid inlet flow path, and a first liquid outlet flow path; wherein:

[0066] Furthermore, such as Figure 4 As shown, the rotary core type liquid storage tank 6 includes a shell 63, an upper straight pipe 62, a first lower straight pipe 64, a second lower straight pipe 65, a partition 66, and a servo motor 61; wherein:

[0067] A servo motor 61 is mounted on the top of the housing 63 and is connected to a partition 66 located in the inner cavity of the housing 63, enabling the partition 66 to rotate horizontally. The partition 66 divides the inner cavity of the housing 63 into two chambers, namely a first chamber and a second chamber. The tops of the first chamber and the second chamber are connected. An upper straight pipe 62 is located on the top of the housing 63 and is connected to its first chamber. A first lower straight pipe 64 is located at the bottom of the housing 63 and is connected to the first chamber. A second lower straight pipe 65 is located at the bottom of the housing 63 and is connected to the second chamber.

[0068] The upper straight pipe 62 at the top of the rotary liquid storage tank 6 is connected to the refrigerant pipe at the exhaust port of the compressor 1 through the first air inlet path;

[0069] The third solenoid valve 71 is installed in the first air intake path;

[0070] One end of the first liquid inlet flow path is connected to the first lower straight pipe 64 of the rotary core liquid storage tank 6, and the other end is connected to the outlet refrigerant pipe of the indoor unit 3.

[0071] The fourth solenoid valve 72 is installed in the first liquid inlet flow path;

[0072] One end of the first liquid outlet flow path is connected to the second lower straight pipe 65 of the rotary core liquid storage tank 6, and the other end is connected to the inlet refrigerant pipe of the outdoor unit 5.

[0073] The seventh solenoid valve 73 is located in the first liquid outlet flow path.

[0074] The rotary refrigerant tank 6 of this invention simplifies the system piping, requiring only three pipes to complete the liquid storage and drainage functions at different stages. Furthermore, by incorporating the rotary refrigerant tank 6, the problem of liquid slugging caused by the compressor 1 drawing in large amounts of liquid during the defrosting process without stopping the compressor 1 can be solved. This invention, by equipping the tank, stores liquid refrigerant in the tank during the heating / defrosting transition, thus resolving the aforementioned liquid absorption problem.

[0075] This invention solves the problem of liquid slugging caused by the compressor 1 sucking in a large amount of liquid during the defrosting process without stopping by setting up a liquid storage unit to store liquid refrigerant in the liquid storage tank during the heating / defrosting mode switching process. By regulating the refrigerant migration during the heating / defrosting mode switching process, the defrosting time is greatly shortened, and the start-up time of the two heating modes is also shortened, thereby improving the heating efficiency.

[0076] In this embodiment, the pressure regulating unit includes a first pressure regulating bypass and a first pressure regulating solenoid valve 74. The two ends of the pressure regulating bypass are connected to the refrigerant lines at the suction and discharge ports of the compressor 1, respectively. The first pressure regulating solenoid valve 74 is located on the first pressure regulating bypass. By connecting a first pressure regulating bypass to the suction and discharge ports of the compressor 1, and opening the first pressure regulating solenoid valve 74, the pressure difference between the suction and discharge ports is reduced, effectively preventing damage to the compressor 1 caused by the reverse pressure difference during the heating / defrosting transition.

[0077] With the above structural configuration, the suction pipe and discharge pipe of compressor 1 are connected by a bypass pipe (first pressure-stabilizing bypass), thereby achieving the function of balancing the suction pressure and discharge pressure of compressor 1. In existing air conditioning systems, when defrosting is required, compressor 1 must first be stopped, and then the first four-way valve 2 must be switched after the pressure on both the inlet and outlet sides of compressor 1 is balanced before compressor 1 can be restarted for defrosting. This invention, by setting up a pressure-stabilizing unit, achieves pressure stabilization and bypass, quickly realizing pressure balance; therefore, the compressor 1 of the air conditioning system can be switched without stopping the system.

[0078] When the air conditioning system is running, the pressure regulating unit is turned off to provide normal heating when in heating mode. When defrosting is required, defrosting preparation is performed first. At this time, the pressure regulating unit is turned on so that the refrigerant between the suction and discharge ports of compressor 1 can be connected through the first pressure regulating bypass, thereby regulating the pressure of the suction and discharge ports of compressor 1. When the suction and discharge port pressures tend to be stable and close to equilibrium, the preparation work before defrosting is completed. The first four-way valve 2 is controlled to switch directly without shutting down compressor 1, and the system can switch from heating mode to defrosting mode.

[0079] The present invention provides an air conditioning system that defrosts without shutting down, such as... Figure 1 As shown, it includes a compressor 1, a first four-way valve 2, an indoor unit 3, a throttle valve 4, an outdoor unit 5, a rotary liquid storage tank 6, a third solenoid valve 71, a fourth solenoid valve 72, a seventh solenoid valve 73, and a first pressure regulating solenoid valve 74.

[0080] Rotary core storage tank 6, such as Figure 4 As shown, the system includes a servo motor 61, an upper straight pipe 62, a housing 63, a first lower straight pipe 64, a second lower straight pipe 65, and a partition 66. The upper straight pipe 62 is connected to a third solenoid valve 71, the first lower straight pipe 64 is connected to a fourth solenoid valve 72, and the second lower straight pipe 65 is connected to a seventh solenoid valve 73. The first pressure-regulating solenoid valve 74 is connected to the suction and exhaust ports of the compressor 1. During control, the servo motor 61 rotates at different angles by receiving pulse signals. For example, two pulse signals are set; when the pulse signal is 0, it is the initial state; when the pulse signal is at its maximum, the partition 66 rotates 180°, thereby achieving the purpose of connecting the outlet with different chambers.

[0081] like Figure 6 As shown, when the air conditioning system is equipped with both a pressure stabilizing unit and a liquid receiver unit, the defrosting process of the air conditioning system is controlled as follows:

[0082] During the heating phase:

[0083] First, when the air conditioning system is in heating mode, the first pressure regulating solenoid valve 74 in the pressure regulating unit is closed, thereby shutting down the pressure regulating unit. At the same time, the third solenoid valve 71, the fourth solenoid valve 72 and the seventh solenoid valve 73 are closed, thereby shutting down the liquid storage unit. The internal cavity of the rotary liquid storage tank 6 is empty of liquid refrigerant. At this time, the indoor unit 3 is on the high-pressure side and stores a large amount of liquid refrigerant.

[0084] During the defrosting preparation stage:

[0085] When the air conditioning system needs to defrost, preparations for defrosting are performed. The third solenoid valve 71 and the first pressure-regulating solenoid valve 74 are kept closed. At this time, the fourth solenoid valve 72 and the seventh solenoid valve 73 are opened. Due to the pressure difference between the fourth solenoid valve 72 and the seventh solenoid valve 73, the liquid refrigerant in the indoor unit 3 is drawn into the rotary receiver 6 via the fourth solenoid valve 72 for partial refrigerant storage. After an interval t, the fourth solenoid valve 72 closes, while the seventh solenoid valve 73 remains open, completing the storage of the liquid refrigerant in the rotary receiver 6. Then, the first pressure-regulating solenoid valve 74 in the pressure-regulating unit is opened, and the third solenoid valve 71 and the fourth solenoid valve 72 are closed. When the suction and discharge pressures of the compressor 1 approach equilibrium, both the compressor 1 and the outdoor fan remain running. The first four-way valve 2 is switched off without stopping, and then closed. The first pressure-regulating solenoid valve 74 is closed, and the baffle 66 in the rotary liquid receiver 6 is started. The servo motor 61 of the rotary liquid receiver 6 receives pulse signal 1 and controls the baffle 66 to rotate 180 degrees. The liquid receiver chamber in the rotary liquid receiver 6 changes position, pushing the liquid refrigerant stored in one chamber into another chamber, so that the liquid refrigerant is pushed into another chamber and connected to the seventh solenoid valve 73. At this time, the liquid refrigerant in the rotary liquid receiver 6 has begun to flow to the outdoor unit 5. The fourth solenoid valve 72 is closed and the third solenoid valve 71 is opened. At this time, the pressure of the high-pressure gaseous refrigerant at the exhaust port of the compressor 1 is used to squeeze the liquid refrigerant stored in the rotary liquid receiver 6 into the outdoor unit 5. After an interval of time t1, the third solenoid valve 71 and the seventh solenoid valve 73 are closed to perform rapid defrosting.

[0086] During the heating preparation stage:

[0087] When preparing to re-enter heating mode after defrosting, a heating preparation phase is required. During this phase, compressor 1 remains running, the third solenoid valve 71 is closed, and the fourth solenoid valve 72 and the seventh solenoid valve 73 are opened. Liquid refrigerant from outdoor unit 5 is drawn into the rotary receiver 6. After an interval t2, the seventh solenoid valve 73 closes, completing the storage of liquid refrigerant in the rotary receiver 6. Then, the first pressure-stabilizing solenoid valve 74 is opened, and once the pressure on both sides of compressor 1 is balanced and stable, the first four-way valve 2 is controlled to reverse without stopping the compressor. Then, the first pressure-regulating solenoid valve 74 is closed, and the rotary liquid storage tank 6 is restarted to receive pulse signal 2 to change the position of the liquid storage chamber, so that the liquid refrigerant chamber is connected to the fourth solenoid valve 72. Then, the third solenoid valve 71 is opened, and the high-pressure gaseous refrigerant discharged from the compressor 1 enters the rotary liquid storage tank 6 through the third solenoid valve 71. The discharge pressure of the compressor 1 is used to squeeze the sucked liquid refrigerant into the indoor unit 3. After an interval of time t3, the third solenoid valve 71 and the fourth solenoid valve 72 are closed, and heating begins.

[0088] Example 2:

[0089] In this embodiment, the present invention provides an air conditioning system, including a compressor 1, a first four-way valve 2, an indoor unit 3, a throttle valve 4, and an outdoor unit 5 connected sequentially via refrigerant piping; it also includes a pressure stabilizing unit connected to the suction and discharge ports of the compressor 1 respectively, to achieve pressure balance on both sides of the suction and discharge ports of the compressor 1. It should be noted that this embodiment can be further improved to shorten the defrosting time. Specifically, in this embodiment, it also includes a liquid storage unit with one end connected to the discharge port of the compressor 1 and the other end connected to the refrigerant piping between the indoor unit 3 and the outdoor unit 5; the liquid storage unit includes a liquid storage tank, an inlet airflow path, a liquid inlet flow path, a liquid outlet flow path, and solenoid valves disposed on all flow paths; wherein:

[0090] One end of the air intake path is connected to the liquid storage tank, and the other end is connected to the compressor's exhaust port;

[0091] One end of the liquid inlet flow path is connected to the liquid storage tank, and the other end is connected to the refrigerant line between the indoor unit and the expansion valve;

[0092] One end of the liquid outlet is connected to the liquid storage tank, and the other end is connected to the refrigerant pipeline between the outdoor unit and the expansion valve.

[0093] By setting up a liquid storage unit, the refrigerant migration during the heating and defrosting mode switching process is improved, thus enhancing heating efficiency.

[0094] In this embodiment, as Figure 2 As shown, the liquid storage unit includes a second liquid storage tank 8, a second air inlet path, an eighth solenoid valve 76, a fifth solenoid valve 77, a second liquid inlet path, a second liquid outlet path, and a sixth solenoid valve 78; wherein:

[0095] The second liquid storage tank 8 has a hollow tank structure with an internal storage cavity; one end of the second air inlet path is connected to the top of the second liquid storage tank 8, and the other end is connected to the outlet refrigerant pipeline of the compressor 1.

[0096] One end of the second liquid inlet flow path is connected to the outlet refrigerant pipe of the indoor unit 3, and the other end is connected to the bottom of the second liquid storage tank 8;

[0097] The fifth solenoid valve 77 is installed in the second inlet flow path;

[0098] One end of the second liquid outlet flow path is connected to the bottom of the second liquid storage tank 8, and the other end is connected to the inlet refrigerant pipeline of the outdoor unit 5;

[0099] The sixth solenoid valve 78 is located in the second liquid outlet path.

[0100] The eighth solenoid valve 76 is located in the second air intake path.

[0101] This invention solves the problem of liquid slugging caused by the compressor 1 sucking in a large amount of liquid during the defrosting process without stopping by setting up a liquid storage unit to store liquid refrigerant in the liquid storage tank during the heating / defrosting mode switching process. By regulating the refrigerant migration during the heating / defrosting mode switching process, the defrosting time is greatly shortened, and the start-up time of the two heating modes is also shortened, thereby improving the heating efficiency.

[0102] In this embodiment, as Figure 2 As shown, the pressure regulating unit includes a second pressure regulating bypass and a second pressure regulating solenoid valve 75; one end of the second pressure regulating bypass is connected to the refrigerant pipeline at the suction port of the compressor 1, and the other end is connected to the top of the second liquid storage tank 8; the second pressure regulating solenoid valve 75 is disposed on the second pressure regulating bypass.

[0103] During use, the stored liquid refrigerant is located at the bottom of the second liquid tank 8, while the gaseous refrigerant flows back to the compressor from the top through the second pressure-stabilizing bypass. When defrosting is required, some of the high-pressure gaseous refrigerant from the compressor pushes the liquid refrigerant from the top of the second liquid tank 8, allowing this portion of the stored liquid refrigerant to enter the outdoor unit 5 and mix with the high-temperature gaseous refrigerant from the compressor for rapid defrosting.

[0104] This invention connects a pressure stabilizing unit to the suction and discharge sides of compressor 1. Before defrosting, the pressure stabilizing unit is activated, balancing the suction and discharge pressures of compressor 1. This ensures the suction and discharge pressures are close and balanced. Then, the first four-way valve 2 is switched, preventing excessive pressure difference between suction and discharge that could damage compressor 1. The reduced pressure between suction and discharge effectively solves the problem of reverse pressure differential damaging compressor 1 during heating / defrosting transitions. It also avoids the issues of poor reliability and shortened lifespan of the four-way reversing valve caused by reverse pressure differential, and prevents liquid refrigerant from entering compressor 1 through the suction port, causing liquid slugging and subsequent malfunction.

[0105] This invention connects a second pressure-stabilizing bypass and a second air intake path, arranged in series, to the suction and discharge ports of compressor 1, and sets up two solenoid valves. When the two solenoid valves, namely the pressure-stabilizing solenoid valve and the eighth solenoid valve, are opened, the second pressure-stabilizing bypass and the second air intake path are connected at the top of the inner cavity of the second liquid storage tank 8, which can realize the connection between the suction and discharge ports of the compressor, reduce the pressure difference between suction and discharge, and effectively solve the problem of damage to compressor 1 caused by reverse pressure difference during the heating / defrosting process.

[0106] When the air conditioning system is running, the pressure regulating unit is closed in heating mode for normal heating. When defrosting is required, defrosting preparation is performed first. At this time, the pressure regulating unit is opened, which means opening the second pressure regulating solenoid valve 75 and the eighth solenoid valve 76, so that the refrigerant between the suction and discharge ports of compressor 1 can be connected through the second intake airflow path and the second pressure regulating bypass, thereby regulating the pressure of the suction and discharge ports of compressor 1. When the suction and discharge port pressures tend to be stable and close to equilibrium, the preparation work before defrosting is completed, and the first four-way valve 2 is controlled to directly switch the direction. Without shutting down compressor 1, the system can switch from heating mode to defrosting mode.

[0107] The present invention provides an air conditioning system that defrosts without shutting down, such as... Figure 2 As shown, it includes a compressor 1, a first four-way valve 2, an indoor unit 3, a throttle valve 4, an outdoor unit 5, a second liquid storage tank 8 (without a directional function), a second pressure regulating solenoid valve 75, an eighth solenoid valve 76, a fifth solenoid valve 77, and a sixth solenoid valve 78.

[0108] The second pressure-regulating solenoid valve 75 is connected to the suction port of compressor 1; the eighth solenoid valve 76 is connected to the discharge port of compressor 1; the fifth solenoid valve 77 is connected to the indoor unit 3 pipeline; and the sixth solenoid valve 78 is connected to the outdoor unit 5 pipeline.

[0109] like Figure 5 and Figure 2 As shown, when the air conditioning system is equipped with both a pressure stabilizing unit and a liquid receiver unit, the defrosting process of the air conditioning system is controlled as follows:

[0110] When heating:

[0111] First, when the air conditioning system is in heating mode, the eighth solenoid valve 76 and the second solenoid valve 75 in the pressure regulating unit are closed, thereby shutting down the pressure regulating unit. At the same time, the fifth solenoid valve 77 and the sixth solenoid valve 78 are closed, thereby shutting down the liquid storage unit.

[0112] Defrosting preparation stage:

[0113] When the air conditioning system needs to defrost, preparations for defrosting are carried out. At this time, the second pressure regulating solenoid valve 75 and the fifth solenoid valve 77 are opened, and the eighth solenoid valve 76 and the sixth solenoid valve 78 are closed, so that the liquid refrigerant in the indoor unit 3 is drawn into the second liquid storage tank 8 through the fifth solenoid valve 77 for partial refrigerant storage.

[0114] Defrost stage:

[0115] Open the eighth solenoid valve 76 in the pressure regulating unit and close the fifth solenoid valve 77. When the pressure at the suction and discharge ports of the compressor 1 is close to reaching equilibrium, the first four-way valve 2 is de-energized but not shut down. Close the second pressure regulating solenoid valve 75 and open the sixth solenoid valve 78. The liquid refrigerant in the second liquid storage tank 8 enters the outdoor unit 5 through the sixth solenoid valve 78 for defrosting.

[0116] Heating preparation stage:

[0117] When resuming heating mode after defrosting, a heating preparation phase is required. During this phase, the second pressure-regulating solenoid valve 75 and the sixth solenoid valve 78 open, while the eighth solenoid valve 76 and the fifth solenoid valve 77 close. Liquid refrigerant in the outdoor unit 5 enters the second liquid receiver 8 through the sixth solenoid valve 78. Then, the eighth solenoid valve 76 opens, and the sixth solenoid valve 78 closes. After the suction and discharge pressures of the compressor 1 are balanced, the first four-way reversing valve is energized and reversed. Then, the second pressure-regulating solenoid valve 75 closes, and the fifth solenoid valve 77 opens. Liquid refrigerant in the second liquid receiver 8 enters the indoor unit 3 through the fifth solenoid valve 77. Subsequently, the second pressure-regulating solenoid valve 75, the eighth solenoid valve 76, the fifth solenoid valve 77, and the sixth solenoid valve 78 all close, initiating heating. The compressor 1 operates continuously throughout the entire process.

[0118] Example 3:

[0119] like Figure 3 As shown, the present invention provides an air conditioning system, including a compressor 1, a first four-way valve 2, an indoor unit 3, a throttle valve 4, and an outdoor unit 5 connected in sequence through refrigerant pipelines; it also includes a pressure stabilizing unit connected to the suction and discharge ports of the compressor 1 respectively, so as to achieve pressure balance on both sides of the suction and discharge ports of the compressor 1.

[0120] This invention connects a pressure stabilizing unit to the suction and discharge sides of compressor 1. Before defrosting, the pressure stabilizing unit is activated, balancing the suction and discharge pressures of compressor 1. This ensures the suction and discharge pressures are close and balanced. Then, the first four-way valve 2 is switched, preventing excessive pressure difference between suction and discharge that could damage compressor 1. The reduced pressure between suction and discharge effectively solves the problem of reverse pressure differential damaging compressor 1 during heating / defrosting transitions, and avoids the issues of poor reliability and reduced lifespan of the four-way reversing valve caused by reverse pressure differential.

[0121] As a further improvement of the present invention, the pressure regulating unit includes a fourth pressure regulating bypass, a second four-way valve 21, and a pressure regulating pump 9; one end of the fourth pressure regulating bypass is connected to the refrigerant pipeline at the outlet of the indoor unit 3, and the other end of the fourth pressure regulating bypass is connected to the refrigerant pipeline at the inlet of the outdoor unit 5; the second four-way valve 21 and the pressure regulating pump 9 are sequentially arranged on the fourth pressure regulating bypass.

[0122] Furthermore, in this embodiment, the non-stop defrosting air conditioning system also includes an exhaust pressure sensor 101 and an intake pressure sensor 102; the pressure stabilizing pump 9 is connected to the indoor unit 3 and the outdoor unit 5 respectively through the second four-way valve 21.

[0123] like Figure 5As shown, when the air conditioning system is equipped with only a voltage stabilizing unit, the defrosting process of the air conditioning system is controlled as follows:

[0124] During heating operation, the first four-way valve 2 and the second four-way valve 21 are energized, while the pressure stabilizing pump 9 is de-energized and shuts down. During the defrosting preparation phase, the pressure stabilizing pump 9 starts up. When the value of the suction pressure sensor 102 approaches the exhaust pressure sensor 101, the pressure stabilizing pump 9 is de-energized and shuts down, and the first four-way valve 2 and the second four-way valve 21 are de-energized and reversed to initiate defrosting. After defrosting, the heating preparation phase begins. The pressure stabilizing pump 9 starts up again. When the value of the suction pressure sensor 102 approaches the exhaust pressure sensor 101, the pressure stabilizing pump 9 is de-energized and shuts down, and the first four-way valve 2 and the second four-way valve 21 are energized and reversed to initiate heating. The pressure stabilizing pump 9 allows refrigerant to quickly enter the outdoor unit 5, increasing the refrigerant flow rate for faster defrosting; the pressure stabilizing pump 9 also functions as a pressure stabilizer.

[0125] Example 4:

[0126] like Figure 5 As shown, the present invention provides a control method for an air conditioning system, used for defrosting the air conditioning system without shutting it down. The control method includes at least the following steps:

[0127] Step S1: Turn on the air conditioning system to heating mode and turn off the voltage regulator unit;

[0128] Step S2: When defrosting is required, some of the solenoid valves in the liquid receiver unit are opened and others are closed to draw liquid refrigerant from the indoor unit side and store it in the liquid receiver tank when the air conditioner is heating; then the pressure stabilizing unit is opened to balance the pressure on both sides of the compressor's suction and discharge ports, completing the preparations before defrosting.

[0129] Step S3: After completing the defrosting preparations, the first four-way valve reverses without stopping the machine, then the pressure stabilizing unit is closed, and another solenoid valve in the liquid storage unit is opened while some solenoid valves are closed. This allows the high-pressure gaseous refrigerant from the compressor exhaust port to push the liquid refrigerant in the liquid storage tank out into the outdoor unit. The liquid refrigerant then mixes with the refrigerant from the compressor exhaust port that enters the outdoor unit through the four-way valve, and the outdoor unit defrosting begins.

[0130] Step S4: After defrosting is complete, turn off the liquid storage unit and turn on the pressure stabilizing unit to balance the pressure on both sides of the compressor's suction and discharge ports, thus completing the heating preparation.

[0131] Step S5: After completing the heating preparation, the first four-way valve reverses without stopping the machine, then the pressure stabilizing unit is shut off, and normal heating begins.

[0132] like Figure 6 As shown, when the storage tank is a rotary core type storage tank, the control method includes:

[0133] During the heating phase, all solenoid valves are closed, the first four-way valve is energized, and there is no liquid refrigerant in the rotary core liquid storage tank.

[0134] Pre-defrosting preparation stage: The rotary reservoir draws out and stores the liquid refrigerant from the indoor side; the solenoid valve of the bypass line connecting the compressor's suction and discharge is opened;

[0135] During the defrosting stage, the compressor does not stop. After the first four-way valve completes the power-off reversal, the bypass solenoid valve closes, and the liquid storage chamber of the rotary liquid receiver changes position. The liquid is squeezed into the outdoor unit by the exhaust pressure and mixes with the refrigerant that enters the outdoor unit through the first four-way valve, thus starting the defrosting process.

[0136] Heating preparation stage: The rotary liquid receiver draws in liquid refrigerant from the outdoor unit, the bypass solenoid valve opens, the compressor does not stop, after the first four-way valve reverses, the bypass solenoid valve closes, and then the position of the liquid receiver chamber in the rotary liquid receiver changes, the liquid is squeezed into the indoor unit by the exhaust pressure, and mixes with the refrigerant in the indoor unit that enters through the first four-way valve, and heating begins.

[0137] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0138] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the appendix. Figure 1 The orientations or positional relationships shown are for the purpose of facilitating and simplifying the description of the present invention, and are not intended to 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 limiting the present invention.

[0139] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0140] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0141] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0142] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0143] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. An air conditioning system, characterized in that, The system includes a compressor, a first four-way valve, an indoor unit, a throttle valve, and an outdoor unit connected sequentially via refrigerant piping; it also includes a liquid storage unit with one end connected to the compressor's exhaust port and the other end connected to the refrigerant piping between the indoor and outdoor units; the liquid storage unit includes a liquid storage tank, an inlet flow path, a liquid inlet flow path, a liquid outlet flow path, and solenoid valves disposed on all flow paths; wherein: One end of the air intake path is connected to the liquid storage tank, and the other end is connected to the exhaust port of the compressor; One end of the liquid inlet flow path is connected to the liquid storage tank, and the other end is connected to the refrigerant pipeline between the indoor unit and the throttling valve; One end of the liquid outlet flow path is connected to the liquid storage tank, and the other end is connected to the refrigerant pipeline between the outdoor unit and the throttling valve; The liquid storage tank is a rotary core type liquid storage tank, including a shell, an upper straight pipe, a first lower straight pipe, a second lower straight pipe, a partition, and a servo motor; wherein: The servo motor is mounted on the top of the housing and is connected to the partition located in the inner cavity of the housing, enabling the partition to rotate horizontally. The partition divides the inner cavity of the housing into two chambers, namely a first chamber and a second chamber. The tops of the first chamber and the second chamber are connected. The upper straight pipe is located on the top of the housing and communicates with the first chamber. The first lower straight pipe is located on the bottom of the housing and communicates with the first chamber. The second lower straight pipe is located on the bottom of the housing and communicates with the second chamber.

2. The air conditioning system according to claim 1, characterized in that, It also includes a pressure stabilizing unit connected to the compressor's suction and discharge ports respectively, so as to achieve pressure balance on both sides of the compressor's suction and discharge ports. The pressure stabilizing unit includes a first pressure stabilizing bypass and a first pressure stabilizing solenoid valve. The two ends of the first pressure stabilizing bypass are respectively connected to the refrigerant pipelines of the compressor's suction and discharge ports. The first pressure stabilizing solenoid valve is disposed on the first pressure stabilizing bypass.

3. An air conditioning system, characterized in that, The system includes a compressor, a first four-way valve, an indoor unit, a throttle valve, and an outdoor unit connected sequentially via refrigerant piping; it also includes a liquid storage unit with one end connected to the compressor's exhaust port and the other end connected to the refrigerant piping between the indoor and outdoor units; the liquid storage unit includes a liquid storage tank, an inlet flow path, a liquid inlet flow path, a liquid outlet flow path, and solenoid valves disposed on all flow paths; wherein: One end of the air intake path is connected to the liquid storage tank, and the other end is connected to the exhaust port of the compressor; One end of the liquid inlet flow path is connected to the liquid storage tank, and the other end is connected to the refrigerant pipeline between the indoor unit and the throttling valve; One end of the liquid outlet flow path is connected to the liquid storage tank, and the other end is connected to the refrigerant pipeline between the outdoor unit and the throttling valve; The liquid storage tank includes a second liquid storage tank, which has a hollow tank structure and an internal storage cavity; the air inlet path is connected to the top of the second liquid storage tank; the liquid inlet path and the liquid outlet path are both connected to the bottom of the second liquid storage tank; It also includes a pressure stabilizing unit connected to the compressor's intake and exhaust ports respectively, so as to achieve pressure balance on both sides of the compressor's intake and exhaust ports. The pressure stabilizing unit includes a second pressure stabilizing bypass and a second pressure stabilizing solenoid valve. One end of the second pressure stabilizing bypass is connected to the compressor's intake port, and the other end is connected to the top of the second liquid storage tank. The second pressure stabilizing solenoid valve is disposed on the second pressure stabilizing bypass.

4. A control method, characterized in that, A method for controlling the defrosting of an air conditioning system without shutting down as described in any one of claims 1-3, the method comprising at least the following steps: The air conditioning system is switched to heating mode and the voltage regulator unit is turned off. When defrosting is required, some solenoid valves in the liquid receiver unit are opened and others are closed to draw liquid refrigerant from the indoor unit side and store it in the liquid receiver tank when the air conditioner is heating; then the pressure stabilizing unit is opened to balance the pressure on both sides of the compressor's suction and discharge ports, completing the preparations before defrosting. After completing the defrosting preparations, the first four-way valve reverses without stopping the machine, then the pressure regulating unit is closed, and another part of the solenoid valves in the liquid receiver unit are opened and some solenoid valves are closed. This allows the high-pressure gaseous refrigerant at the compressor exhaust port to push the liquid refrigerant in the liquid receiver tank out into the outdoor unit. The liquid refrigerant then mixes with the refrigerant that enters the outdoor unit through the four-way valve at the compressor exhaust port, thus starting the outdoor unit defrosting process. After defrosting is complete, turn off the liquid storage unit and turn on the pressure stabilizing unit to balance the pressure on both sides of the compressor's suction and discharge ports, thus completing the heating preparation. After completing the heating preparation, the first four-way valve reverses without shutting down the system, then the pressure regulating unit is shut off, and normal heating begins. hot.

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