Control method and air conditioning system

Abstract

The invention provides a control method and an air conditioning system, relates to the technical field of air conditioners, and solves the technical problem that an air conditioner cannot perform reversing defrosting in a non-stop state. The air conditioner comprises a compressor, a first four-way valve, an indoor unit, a throttling valve and an outdoor unit which are sequentially connected through a refrigerant pipeline. One end of the liquid storage unit is connected with an exhaust port of the compressor, and the other end of the liquid storage unit is connected with a refrigerant pipeline between the indoor unit and the outdoor unit; the liquid storage unit comprises a liquid storage tank, an air inlet flow path, a liquid inlet flow path, a liquid outlet flow path and electromagnetic valves arranged on all the flow paths; one end of the air inlet flow path is connected with the liquid storage tank, and the other end is connected with an exhaust port of the compressor; one end of the liquid inlet flow path is connected with the liquid storage tank, and the other end is connected with a refrigerant pipeline between the indoor unit and the throttle valve; one end of the liquid outlet flow path is connected with the liquid storage tank, and the other end of the liquid outlet flow path is connected with the refrigerant pipeline between the outdoor unit and the throttle valve. Non-stop defrosting can be achieved, the defrosting time is greatly shortened, and the heating efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a non-stop defrosting control method for an air conditioning system and the air conditioning system. Background Art

[0002] Defrosting is a highly discussed issue for air conditioners operating in low-temperature heating mode. The current standard defrosting method involves shutting down the compressor. After the pressures at the compressor's intake and exhaust ports reach equilibrium, the four-way reversing valve is de-energized and reversed. The compressor is then restarted to raise the outdoor pressure and initiate defrosting. After defrosting is complete, the compressor must be shut down again, and the four-way reversing valve is then re-energized to switch to heating mode. This defrosting method requires two shutdowns per heating-defrosting cycle, resulting in a relatively short heating period and low average heating capacity. This is particularly true for high-speed compressors, as the frequency ramp-up rate is limited, leading to a longer ramp-up time during the mode transition and poorer heating performance at low temperatures. Therefore, reversing the four-way reversing valve while the compressor is operating at high speed will improve heating efficiency.

[0003] There are two main difficulties to overcome when performing defrosting without stopping the compressor: First, after the four-way reversing valve is reversed, the compressor exhaust is connected to the low-pressure pipeline, and the suction is connected to the high-pressure pipeline, which creates a reverse pressure differential. This reverse pressure differential makes the compressor unstable and may even damage the compressor. It also faces reliability issues with the four-way reversing valve, shortening its service life. Second, there is a large amount of liquid refrigerant on the high-pressure side. If the compressor is reversed without stopping, the liquid refrigerant enters the compressor through the suction port, causing liquid hammer in the compressor and thus failure. Summary of the Invention

[0004] The object of the present invention is to provide a non-stop defrosting control method for an air-conditioning system and an air-conditioning system, so as to solve the technical problem in the prior art that the air-conditioning system cannot perform reversing defrosting without stopping.

[0005] To achieve the above objectives, the present invention provides the following technical solutions: The present invention provides an air conditioning system comprising a compressor, a first four-way valve, an indoor unit, a throttle valve, and an outdoor unit, which are sequentially connected via a refrigerant pipeline; a liquid storage unit having one end connected to the compressor exhaust port and the other end connected to the refrigerant pipeline between the indoor unit and the outdoor unit; the liquid storage unit comprises a liquid storage tank, an air inlet flow path, a liquid inlet flow path, a liquid outlet flow path, and solenoid valves provided on all flow paths; wherein: One end of the intake air 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 throttle 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 throttle valve.

[0006] The present invention provides a liquid storage unit to store liquid refrigerant in a liquid storage tank during the heating / defrost switching process, thereby solving the problem of liquid hammer caused by the compressor sucking in a large amount of liquid during the defrost process without stopping the compressor. By regulating the migration of refrigerant during the heating / defrost mode switching process, the defrost time is greatly shortened, and the start-up time of the second heating is also shortened, thereby improving the heating efficiency. By connecting a pressure stabilizing unit to the suction and exhaust sides of the compressor, the pressure stabilizing unit can be turned on before the air conditioner needs to defrost, thereby using the pressure stabilizing unit to achieve the function of balancing the suction pressure and exhaust pressure of the compressor, that is, the pressures on the suction and exhaust sides of the compressor are close and balanced. At this time, the first four-way valve is switched, which can avoid excessive pressure difference between the suction and exhaust, which may cause damage to the compressor. The pressure between the suction and exhaust is reduced, which can effectively solve the problem of damage to the compressor caused by the reverse pressure difference during the heating / defrost switching process, avoid the problem of poor reliability and shortened service life of the four-way reversing valve caused by the reverse pressure difference, and avoid the problem of liquid refrigerant entering the compressor through the suction port, which may cause liquid hammer in the compressor and thus cause malfunction.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] As a further improvement of the present invention, the liquid storage tank is a rotary core type liquid storage tank, comprising a shell, an upper straight tube, a first lower straight tube, a second lower straight tube, a partition and a servo motor; wherein: The servo motor is installed on the top of the shell and is transmission-connected to the partition located in the inner cavity of the shell, and can drive the partition to rotate horizontally; the partition divides the inner cavity of the shell into two chambers, namely the first chamber and the second chamber; the tops of the first chamber and the second chamber are connected; the upper straight tube is arranged at the top of the shell and is connected to the first chamber; the first lower straight tube is arranged at the bottom of the shell and is connected to the first chamber; the second lower straight tube is arranged at the bottom of the shell and is connected to the second chamber.

[0009] The liquid storage tank includes a second liquid storage tank, which is a hollow tank structure with a storage cavity inside; the air inlet path is connected to the top of the second liquid storage tank; the liquid inlet pipeline and the liquid outlet pipeline are both connected to the bottom of the second liquid storage tank.

[0010] It also includes a pressure stabilizing unit connected to the compressor suction and exhaust ports respectively to achieve pressure balance on both sides of the compressor suction and exhaust ports, and 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 pipelines of the suction and exhaust ports of the compressor; the first pressure stabilizing solenoid valve is arranged on the first pressure stabilizing bypass.

[0011] It also includes a pressure stabilizing unit connected to the compressor intake and exhaust ports respectively to achieve pressure balance on both sides of the compressor intake and exhaust ports, and 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 intake port, and the other end is connected to the top of the second liquid storage tank; the second pressure stabilizing solenoid valve is arranged on the second pressure stabilizing bypass.

[0012] The present invention provides a control method for performing non-stop defrosting on an air-conditioning system, the method comprising at least the following steps: The air conditioning system turns on the heating mode and turns off the voltage stabilizing unit; When defrosting is required, some solenoid valves in the liquid storage unit are controlled to open, while others are closed, so that liquid refrigerant from the indoor unit is extracted and stored in the liquid storage tank when the air conditioner is heating. The pressure stabilizing unit is then controlled to open to balance the pressure on both sides of the compressor suction and exhaust ports, completing the preparations for defrosting. After the defrosting preparation is completed, the first four-way valve is reversed without stopping the machine, and then the voltage stabilizing unit is closed, and the other solenoid valve in the liquid storage unit is controlled to open, and some solenoid valves are closed, so that the high-pressure gaseous refrigerant at the compressor exhaust port pushes the liquid refrigerant in the liquid storage tank to flow out and enter the outdoor unit, and mixes with the refrigerant entering the outdoor unit through the four-way valve at the compressor exhaust port, and the outdoor unit starts defrosting; After defrosting is completed, the liquid storage unit is closed and the pressure stabilizing unit is opened to balance the pressure on both sides of the compressor suction and exhaust ports, completing the heating preparation; After the heating preparation is completed, the first four-way valve is reversed without stopping the machine, and then the voltage stabilizing unit is closed to start normal heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0014] Figure 1 This is a system composition diagram of an embodiment of the air-conditioning system of the present invention; Figure 2 1 is a system composition diagram of a second embodiment of the air-conditioning system of the present invention; Figure 3 1 is a system composition diagram of a third embodiment of an air-conditioning system of the present invention; Figure 4 This is a perspective structural diagram of a rotary core type liquid storage tank in one embodiment of the air conditioning system of the present invention; Figure 5 is a control flow chart of the control method of the present invention; Figure 6 It is a control flow chart for an implementation of the control method of the present invention.

[0015] In the picture: 1. Compressor; 2. First four-way valve; 3. Indoor unit; 4. Throttle valve; 5. Outdoor unit; 6. Rotary core liquid storage tank; 8. Second liquid storage tank; 9. Pressure-stabilizing pump; 21. Second four-way valve; 101. Exhaust pressure sensor; 102. Inspiratory pressure sensor; 61. Servo motor; 62. Upper straight pipe; 63. Shell; 64. First lower straight pipe; 65. Second lower straight pipe; 66. Partition; 71. Third solenoid valve; 72. Fourth solenoid valve; 73. Seventh solenoid valve; 74. First voltage-stabilizing solenoid valve; 75. Second voltage stabilizing solenoid valve; 76. Eighth solenoid valve; 77. Fifth solenoid valve; 78. Sixth solenoid valve. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without inventive effort are within the scope of protection of the present invention.

[0017] like Figure 1As shown, the present invention provides an air conditioning system comprising a compressor 1, a first four-way valve 2, an indoor unit 3, a throttle valve 4, and an outdoor unit 5, which are sequentially connected via a refrigerant pipeline. The system also includes a pressure stabilizing unit connected to the intake and exhaust ports of the compressor 1 to achieve pressure balance on both sides of the intake and exhaust ports of the compressor 1. It should be noted that, in order to shorten the defrost time, this embodiment also includes a liquid storage unit connected at one end to the exhaust port of the compressor 1 and at the other end to the refrigerant pipeline between the indoor unit 3 and the outdoor unit 5.

[0018] Specifically, the liquid storage unit includes a liquid storage tank, an air inlet flow path, a liquid inlet flow path, a liquid outlet flow path, and solenoid valves provided on all flow paths; wherein: One end of the intake air 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 throttle 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 throttle valve.

[0019] The present invention connects a voltage stabilizing unit to the suction and exhaust sides of the compressor 1. Before the air conditioner needs to defrost, the voltage stabilizing unit can be turned on first, thereby utilizing the voltage stabilizing unit to achieve the function of balancing the suction pressure and exhaust pressure of the compressor 1, that is, the pressures on the suction and exhaust sides of the compressor 1 are close and balanced. At this time, the first four-way valve 2 is reversed to avoid excessive pressure difference between the suction and exhaust, which may cause damage to the compressor 1. The pressure between the suction and exhaust is reduced, which can effectively solve the problem of reverse pressure difference causing damage to the compressor 1 during the heating / defrosting switching process, and avoid the problem of poor reliability and shortened use of the four-way reversing valve due to reverse pressure difference. By setting a liquid storage unit, the refrigerant migration during the heating-defrosting mode switching process is controlled, the heating efficiency is improved, and the problem of liquid refrigerant entering the compressor 1 through the suction port, causing liquid hammer in the compressor 1, and thus causing failure is avoided.

[0020] Example 1: 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, which are sequentially connected through a refrigerant pipeline; Furthermore, in this embodiment, the liquid storage unit includes a rotary core liquid storage tank 6, a third solenoid valve 71, a fourth solenoid valve 72, a seventh solenoid valve 73, a first air inlet path, a first liquid inlet path, and a first liquid outlet path; wherein: Furthermore, Figure 4 As shown, the rotary core type liquid storage tank 6 includes a shell 63, an upper straight tube 62, a first lower straight tube 64, a second lower straight tube 65, a partition 66 and a servo motor 61; wherein: The servo motor 61 is installed on the top of the shell 63 and is transmission-connected to the partition 66 located in the inner cavity of the shell 63, and can drive the partition 66 to rotate horizontally; the partition 66 divides the inner cavity of the shell 63 into two chambers, namely the first chamber and the second chamber; the tops of the first chamber and the second chamber are connected; the upper straight tube 62 is arranged at the top of the shell 63 and is connected to its first chamber; the first lower straight tube 64 is arranged at the bottom of the shell 63 and is connected to the first chamber; the second lower straight tube 65 is arranged at the bottom of the shell 63 and is connected to the second chamber.

[0021] The upper straight pipe 62 on the top of the rotary core liquid storage tank 6 is connected to the refrigerant pipeline of the exhaust port of the compressor 1 through the first inlet air path; The third solenoid valve 71 is provided on the first intake air flow path; 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 pipeline of the indoor unit 3; The fourth solenoid valve 72 is provided on the first liquid inlet flow path; 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 pipeline of the outdoor unit 5; The seventh solenoid valve 73 is provided on the first liquid outlet flow path.

[0022] The rotary core liquid storage tank 6 of the present invention simplifies system piping, requiring only three pipelines to complete the different stages of liquid storage and drainage. Furthermore, the provision of the rotary core liquid storage tank 6 solves the problem of large amounts of liquid being drawn in during the compressor 1's defrosting process without stopping, leading to liquid hammer. By providing a liquid storage tank, the present invention stores liquid refrigerant in the tank during the heating / defrosting transition, thereby resolving this problem.

[0023] The present invention provides a liquid storage unit to store liquid refrigerant in a liquid storage tank during the heating / defrosting switching process, thereby solving the problem of liquid hammer caused by the compressor 1 sucking in a large amount of liquid during the defrosting process without stopping. 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 second heating is also shortened, thereby improving the heating efficiency.

[0024] In this embodiment, the pressure-stabilizing unit includes a first pressure-stabilizing bypass and a first pressure-stabilizing solenoid valve 74. The two ends of the pressure-stabilizing bypass are respectively connected to the refrigerant pipelines at the intake and exhaust ports of compressor 1. The first pressure-stabilizing solenoid valve 74 is disposed on the first pressure-stabilizing bypass. By connecting a first pressure-stabilizing bypass to the intake and exhaust ports of compressor 1, opening the first pressure-stabilizing solenoid valve 74 reduces the pressure differential between the intake and exhaust ports, effectively preventing damage to compressor 1 caused by a reverse pressure differential during the heating / defrosting transition.

[0025] Through the above structural arrangement, the suction and discharge pipes of compressor 1 are connected by a bypass line (a first pressure-stabilizing bypass), thereby balancing the suction and discharge pressures of compressor 1. When defrosting is required in existing air conditioning systems, compressor 1 must first be stopped. After the pressures at the inlet and outlet of compressor 1 are balanced, first four-way valve 2 is reversed, and compressor 1 is restarted for defrosting. The present invention, by providing a pressure-stabilizing unit, acts as a pressure-stabilizing bypass, quickly achieving pressure balance; therefore, reversing can be performed without stopping compressor 1 of the air conditioning system.

[0026] When the air-conditioning system is running, when it is in heating mode, the voltage stabilizing unit is closed for normal heating; when defrosting is required, defrosting preparation is performed first. At this time, the voltage stabilizing unit is turned on, so that the refrigerant between the suction and exhaust ports of the compressor 1 can be connected through the first pressure stabilizing bypass, thereby adjusting the pressure of the suction and exhaust ports of the compressor 1. When the suction and exhaust port pressures tend to be stable and balanced, the preparations before defrosting are completed, and the first four-way valve 2 is controlled to directly reverse, and the heating mode can be switched to the defrost mode without shutting down the compressor 1.

[0027] The present invention provides an air conditioning system for defrosting without stopping, 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 core liquid storage tank 6, a third solenoid valve 71, a fourth solenoid valve 72, a seventh solenoid valve 73, and a first pressure-stabilizing solenoid valve 74.

[0028] Rotary core type liquid storage tank 6, such as Figure 4 As shown, it includes a servo motor 61, an upper straight tube 62, a housing 63, a first lower straight tube 64, a second lower straight tube 65, and a partition 66. The upper straight tube 62 is connected to the third solenoid valve 71, the first lower straight tube 64 is connected to the fourth solenoid valve 72, and the second lower straight tube 65 is connected to the seventh solenoid valve 73. The first pressure-stabilizing solenoid valve 74 is connected to the intake and exhaust ports of the compressor 1. During control, the servo motor 61 rotates to 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 maximum, the partition 66 rotates 180°, thereby achieving the purpose of connecting the outlet with different chambers.

[0029] like Figure 6 As shown in the figure, when the air-conditioning system is equipped with both a voltage stabilizing unit and a liquid storage unit, the defrosting process of the air-conditioning system is controlled as follows: During the heating phase: First, when the air-conditioning system is in heating mode, the first pressure-stabilizing solenoid valve 74 in the pressure-stabilizing unit is closed, thereby closing the pressure-stabilizing unit, and at the same time, the third solenoid valve 71, the fourth solenoid valve 72 and the seventh solenoid valve 73 are closed, thereby closing the liquid storage unit, and there is no liquid refrigerant in the internal cavity of the rotary liquid storage tank 6; at this time, the indoor unit 3 is on the high-pressure side and stores a large amount of liquid refrigerant.

[0030] During the defrost preparation stage: When the air-conditioning system needs to defrost, preparatory work before defrosting is carried out; the third solenoid valve 71 and the first pressure-stabilizing 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 core liquid storage tank 6 through the fourth solenoid valve 72 for partial refrigerant storage. After the interval t, the fourth solenoid valve 72 is closed and the seventh solenoid valve 73 remains open, and the liquid refrigerant completes the storage in the rotary core liquid storage tank 6; then the first pressure-stabilizing solenoid valve 74 in the pressure-stabilizing unit is opened, and the third solenoid valve 71 and the fourth solenoid valve 72 are closed; when the pressure at the suction and exhaust ports of the compressor 1 is close to reaching equilibrium, the compressor 1 and the outdoor fan are both shut down, and the first four-way valve 2 is reversed without shutting down, and then closed. Close the first pressure-stabilizing solenoid valve 74, and at the same time control the partition 66 in the rotary liquid storage tank 6 to start, the servo motor 61 of the rotary liquid storage tank 6 receives the pulse signal 1, controls the partition 66 to rotate 180 degrees, and the liquid storage chamber in the rotary liquid storage tank 6 changes position, pushing the liquid refrigerant stored in one chamber of the rotary liquid storage tank 6 into another chamber, so that the liquid refrigerant is pushed to another chamber and connected to the seventh solenoid valve 73. At this time, the liquid refrigerant in the rotary liquid storage tank 6 has begun to flow to the outdoor unit 5; close the fourth solenoid valve 72, and open the third solenoid valve 71. 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 storage tank 6 into the outdoor unit 5. After the interval t1, the third solenoid valve 71 and the seventh solenoid valve 73 are closed for rapid defrosting.

[0031] During the heating preparation phase: When the defrosting is completed and the heating mode is to be entered again, the heating preparation stage is required. At this time, the compressor 1 does not stop, the third solenoid valve 71 is closed, the fourth solenoid valve 72 and the seventh solenoid valve 73 are opened, and the liquid refrigerant in the outdoor unit 5 is sucked into the rotary core liquid storage tank 6. After the interval t2, the seventh solenoid valve 73 is closed to complete the storage of the liquid refrigerant in the rotary core liquid storage tank 6; then the first pressure stabilizing solenoid valve 74 is opened, and when the pressure on both sides of the compressor 1 is balanced and stable, the first four-way valve 2 is controlled to switch without stopping. , then control the first pressure-stabilizing solenoid valve 74 to close, and the rotary core liquid storage tank 6 starts again to receive the pulse signal 2 to complete the change of the liquid storage chamber position, so that the liquid refrigerant chamber is connected to the fourth solenoid valve 72, and then open the third solenoid valve 71, and the exhaust high-pressure gaseous refrigerant of the compressor 1 enters the rotary core liquid storage tank 6 through the third solenoid valve 71, and the exhaust pressure of the compressor 1 is used to squeeze the inhaled liquid refrigerant into the indoor unit 3. After the interval t3, the third solenoid valve 71 and the fourth solenoid valve 72 are closed, and heating starts.

[0032] Example 2: In this embodiment, the present invention provides an air conditioning system, comprising a compressor 1, a first four-way valve 2, an indoor unit 3, a throttle valve 4, and an outdoor unit 5, which are sequentially connected via a refrigerant pipeline; and further comprising a pressure stabilizing unit connected to the suction and exhaust ports of the compressor 1, respectively, to achieve pressure balance on both sides of the suction and exhaust ports of the compressor 1. It should be noted that this embodiment can be further improved to shorten the defrost time. Specifically, in this embodiment, the system further comprises a liquid storage unit connected at one end to the exhaust port of the compressor 1 and at the other end to the refrigerant pipeline between the indoor unit 3 and the outdoor unit 5; the liquid storage unit comprises a liquid storage tank, an air 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 intake air 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 throttle 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 throttle valve.

[0033] By setting up a liquid storage unit, the refrigerant migration during the conversion process between heating and defrosting modes can be controlled, thereby improving the heating efficiency.

[0034] In this embodiment, if Figure 2 As shown, the liquid storage unit includes a second liquid storage tank 8, a second inlet flow path, an eighth solenoid valve 76, a fifth solenoid valve 77, a second liquid inlet flow path, a second liquid outlet flow path; a sixth solenoid valve 78; wherein: The second liquid storage tank 8 is a hollow tank structure with a storage cavity inside; one end of the second inlet air 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; One end of the second liquid inlet flow path is connected to the outlet refrigerant pipeline of the indoor unit 3, and the other end is connected to the bottom of the second liquid storage tank 8; The fifth solenoid valve 77 is provided on the second liquid inlet flow path; 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; The sixth solenoid valve 78 is provided on the second liquid outlet flow path.

[0035] The eighth solenoid valve 76 is provided in the second intake air flow path.

[0036] The present invention provides a liquid storage unit to store liquid refrigerant in a liquid storage tank during the heating / defrosting switching process, thereby solving the problem of liquid hammer caused by the compressor 1 sucking in a large amount of liquid during the defrosting process without stopping. 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 second heating is also shortened, thereby improving the heating efficiency.

[0037] In this embodiment, if Figure 2 As shown, the pressure stabilizing unit includes a second pressure stabilizing bypass and a second pressure stabilizing solenoid valve 75; one end of the second pressure stabilizing bypass is connected to the refrigerant pipeline of 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 stabilizing solenoid valve 75 is arranged on the second pressure stabilizing bypass.

[0038] During use, the stored liquid refrigerant is at the bottom of the second liquid storage tank 8, and the gaseous refrigerant will flow back to the compressor from the top through the second pressure-stabilizing bypass. When defrosting is required, part of the high-pressure gaseous refrigerant of the compressor will push the liquid refrigerant from the top of the second liquid storage tank 8, so that the stored liquid refrigerant enters the outdoor unit 5 and mixes with the high-temperature gaseous refrigerant of the compressor for rapid defrosting.

[0039] By connecting a pressure stabilizing unit to the suction and exhaust sides of the compressor 1, the present invention can open the pressure stabilizing unit before the air conditioner needs to defrost, thereby utilizing the pressure stabilizing unit to achieve the function of balancing the suction pressure and exhaust pressure of the compressor 1, that is, the pressures on the suction and exhaust sides of the compressor 1 are close and balanced. At this time, the first four-way valve 2 is reversed to avoid excessive pressure difference between the suction and exhaust, which may cause damage to the compressor 1. The pressure between the suction and exhaust is reduced, which can effectively solve the problem of damage to the compressor 1 caused by the reverse pressure difference during the heating / defrosting conversion process, avoid the problem of poor reliability and shortened use of the four-way reversing valve due to the reverse pressure difference, and avoid the problem of liquid refrigerant entering the compressor 1 through the suction port, causing liquid hammer in the compressor 1 and thus malfunctioning.

[0040] The present invention connects a second pressure-stabilizing bypass and a second air intake path arranged in series at the air intake and exhaust ports of the compressor 1, and sets two solenoid valves. When the two solenoid valves, namely the pressure-stabilizing solenoid valve and the eighth solenoid valve, are opened, since the second pressure-stabilizing bypass and the second air intake path are in a connected state at the top of the inner cavity of the second liquid storage tank 8, the connection between the air intake and exhaust ports of the compressor can be achieved, so that the pressure difference between the intake and exhaust can be reduced, which can effectively solve the damage to the compressor 1 caused by the reverse pressure difference during the heating / defrosting conversion process.

[0041] When the air-conditioning system is running, when it is in heating mode, the voltage stabilizing unit is closed for normal heating; when defrosting is required, defrosting preparation is performed first. At this time, the voltage stabilizing unit is opened, that is, the second voltage stabilizing solenoid valve 75 and the eighth solenoid valve 76 are opened, so that the refrigerant between the suction and exhaust ports of the compressor 1 can be connected through the second air intake path and the second voltage stabilizing bypass, thereby adjusting the pressure of the suction and exhaust ports of the compressor 1. When the pressure of the suction and exhaust ports tends to be stable and close to equilibrium, the preparations before defrosting are completed, and the first four-way valve 2 is controlled to directly reverse, and the heating mode can be switched to the defrost mode without shutting down the compressor 1.

[0042] The present invention provides an air conditioning system for defrosting without stopping, such as Figure 2As 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 steering function), a second pressure-stabilizing solenoid valve 75, an eighth solenoid valve 76, a fifth solenoid valve 77, and a sixth solenoid valve 78.

[0043] The second pressure-stabilizing solenoid valve 75 is connected to the air intake port of the compressor 1; the eighth solenoid valve 76 is connected to the air exhaust port of the compressor 1; the fifth solenoid valve 77 is connected to the pipeline of the indoor unit 3, and the sixth solenoid valve 78 is connected to the pipeline of the outdoor unit 5.

[0044] like Figure 5 and Figure 2 As shown in the figure, when the air-conditioning system is equipped with both a voltage stabilizing unit and a liquid storage unit, the defrosting process of the air-conditioning system is controlled as follows: During heating operation: First, when the air conditioning system is in heating mode, the eighth solenoid valve 76 and the second solenoid valve 75 in the voltage stabilizing unit are closed, thereby closing the voltage stabilizing unit, and at the same time, the fifth solenoid valve 77 and the sixth solenoid valve 78 are closed, thereby closing the liquid storage unit.

[0045] Defrosting preparation stage: When the air conditioning system needs to defrost, it performs preparatory work before defrosting. At this time, the second pressure-stabilizing 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 storage of the refrigerant. Defrosting stage: The eighth solenoid valve 76 in the pressure stabilizing unit is opened, and the fifth solenoid valve 77 is closed. When the pressure at the suction and exhaust ports of the compressor 1 is close to equilibrium, the first four-way valve 2 is de-energized and reversed without shutting down the machine. The second pressure stabilizing solenoid valve 75 is closed, and the sixth solenoid valve 78 is opened. The liquid refrigerant in the second liquid storage tank 8 enters the outdoor unit 5 through the sixth solenoid valve 78, and defrosting is performed. Heating preparation stage: After defrosting is complete and the heating mode is ready to be entered again, a heating preparation phase is required. At this point, the second pressure-stabilizing solenoid valve 75 and the sixth solenoid valve 78 are opened, while the eighth solenoid valve 76 and the fifth solenoid valve 77 are closed. Liquid refrigerant in the outdoor unit 5 enters the second liquid storage tank 8 through the sixth solenoid valve 78. Then, the eighth solenoid valve 76 opens and the sixth solenoid valve 78 closes. After the pressures at the suction and discharge ends of the compressor 1 are balanced, the first four-way reversing valve is energized and reversed. The second pressure-stabilizing solenoid valve 75 closes and the fifth solenoid valve 77 opens. Liquid refrigerant in the second liquid storage tank 8 enters the indoor unit 3 through the fifth solenoid valve 77. Subsequently, the second pressure-stabilizing solenoid valve 75, the eighth solenoid valve 76, the fifth solenoid valve 77, and the sixth solenoid valve 78 are all closed, and heating is initiated. The compressor 1 does not shut down during this entire process.

[0046] Example 3: 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 a refrigerant pipeline; and also includes a pressure stabilizing unit connected to the suction and exhaust ports of the compressor 1 respectively to achieve pressure balance on both sides of the suction and exhaust ports of the compressor 1.

[0047] By connecting a pressure stabilizing unit to the suction and exhaust sides of the compressor 1, the present invention can open the pressure stabilizing unit before the air conditioner needs to defrost, thereby utilizing the pressure stabilizing unit to achieve the function of balancing the suction pressure and exhaust pressure of the compressor 1, that is, the pressures on the suction and exhaust sides of the compressor 1 are close and balanced. At this time, the first four-way valve 2 is reversed to avoid excessive pressure difference between the suction and exhaust, which may cause damage to the compressor 1. The pressure between the suction and exhaust is reduced, which can effectively solve the problem of damage to the compressor 1 caused by the reverse pressure difference during the heating / defrosting conversion process, and avoid the problem of poor reliability and shortened service life of the four-way reversing valve caused by the reverse pressure difference.

[0048] As a further improvement of the present invention, the pressure stabilizing unit includes a fourth pressure stabilizing bypass, a second four-way valve 21, and a pressure stabilizing pump 9; one end of the fourth pressure stabilizing bypass is connected to the refrigerant pipeline at the outlet of the indoor unit 3, and the other end of the fourth pressure stabilizing bypass is connected to the refrigerant pipeline at the inlet of the outdoor unit 5; the second four-way valve 21 and the pressure stabilizing pump 9 are arranged in sequence on the fourth pressure stabilizing bypass.

[0049] Furthermore, in this embodiment, the non-stop defrosting air conditioning system further includes an exhaust pressure sensor 101 and an intake pressure sensor 102 ; the pressure regulating pump 9 is connected to the indoor unit 3 and the outdoor unit 5 respectively through the second four-way valve 21 .

[0050] like Figure 5 As shown in the figure, when the air-conditioning system is only equipped with a voltage stabilizing unit, the defrosting process of the air-conditioning system is controlled as follows: During heating operation, the first four-way valve 2 and the second four-way valve 21 are energized, and the pressure-stabilizing pump 9 is de-energized and shut down. During the defrosting preparation stage, the pressure-stabilizing pump 9 is turned on. When the value of the suction pressure sensor 102 approaches the exhaust pressure sensor 101, the pressure-stabilizing pump 9 is de-energized and shut down, and the first four-way valve 2 and the second four-way valve 21 are de-energized and switched to perform defrosting. After defrosting is completed and the heating preparation stage begins, the pressure-stabilizing pump 9 is turned on. When the value of the suction pressure sensor 102 approaches the exhaust pressure sensor 101, the pressure-stabilizing pump 9 is de-energized and shut down, and the first four-way valve 2 and the second four-way valve 21 are energized and switched to perform heating. The pressure-stabilizing pump 9 allows the refrigerant to quickly enter the outdoor unit 5, increasing the refrigerant speed and allowing for rapid defrosting; the pressure-stabilizing pump 9 also serves as a pressure stabilizer.

[0051] Example 4: like Figure 5As shown, the present invention provides a control method for an air-conditioning system, which is used to perform non-stop defrosting on the air-conditioning system. The control method includes at least the following steps: Step S1: The air conditioning system turns on the heating mode and turns off the voltage stabilizing unit; Step S2: When defrosting is required, some solenoid valves in the liquid storage unit are controlled to open and other solenoid valves are controlled to close, so as to extract liquid refrigerant from the indoor unit side and store it in the liquid storage tank when the air conditioner is heating; then the pressure stabilizing unit is controlled to open to balance the pressure on both sides of the compressor suction and exhaust ports, thus completing the preparation before defrosting; Step S3: After the defrosting preparation is completed, the first four-way valve is reversed without shutting down the machine, and then the voltage stabilizing unit is closed, and the other solenoid valve in the liquid storage unit is controlled to open, while some solenoid valves are closed, so that the high-pressure gaseous refrigerant at the compressor exhaust port pushes the liquid refrigerant in the liquid storage tank to flow out into the outdoor unit and mix with the refrigerant entering the outdoor unit through the four-way valve at the compressor exhaust port, thereby starting the defrosting of the outdoor unit; Step S4: After defrosting is completed, the liquid storage unit is closed and the pressure stabilizing unit is opened to balance the pressure on both sides of the compressor suction and exhaust ports, thereby completing the heating preparation; Step S5: After the heating preparation is completed, the first four-way valve is reversed without shutting down the machine, and then the voltage stabilizing unit is closed to start normal heating.

[0052] like Figure 6 As shown, when the liquid storage tank is a rotary core type liquid storage tank, the control method includes: In the heating stage, all solenoid valves are in the closed state, the first four-way valve is energized, and there is no liquid refrigerant in the rotary core liquid storage tank; Preparation stage before defrosting: the rotary core liquid storage tank extracts the liquid refrigerant from the indoor side and stores it; the solenoid valve of the bypass line connecting the compressor suction and exhaust is opened; During the defrost phase, the compressor does not stop. After the first four-way valve completes power-off reversal, the bypass solenoid valve closes, and the liquid storage chamber of the rotary core liquid storage tank switches position. The liquid is squeezed into the outdoor unit by the exhaust pressure and mixed with the refrigerant from the compressor that enters the outdoor unit through the first four-way valve, and defrosting begins. Heating preparation stage: the rotary core liquid storage tank sucks the liquid refrigerant in the outdoor unit, the bypass solenoid valve opens, the compressor does not stop, and after the first four-way valve is reversed, the bypass solenoid valve closes. Then the position of the liquid storage chamber in the rotary core liquid storage tank is changed, and the liquid is squeezed into the indoor unit by the exhaust pressure and mixed with the refrigerant in the indoor unit that enters the compressor through the first four-way valve, and heating begins.

[0053] First of all, it should be noted that “inward” refers to the direction toward the center of the accommodating space, and “outward” refers to the direction away from the center of the accommodating space.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0056] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0057] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0058] In the description of this specification, the reference terms "one embodiment," "some embodiments," "example," "specific example," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0059] 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 modifications or substitutions that can be easily conceived by a person 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 based on the scope of protection of the claims.

Claims

1. An air conditioning system, characterized in that: The invention comprises a compressor, a first four-way valve, an indoor unit, a throttle valve, and an outdoor unit connected in sequence through a refrigerant pipeline; and further comprises a liquid storage unit having one end connected to the exhaust port of the compressor and the other end connected to the refrigerant pipeline between the indoor unit and the outdoor unit; the liquid storage unit comprises a liquid storage tank, an air inlet flow path, a liquid inlet flow path, a liquid outlet flow path, and solenoid valves provided on all flow paths; wherein: One end of the intake air 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 throttle 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 throttle valve.

2. The air conditioning system according to claim 1, characterized in that The liquid storage tank is a rotary core type liquid storage tank, comprising a shell, an upper straight tube, a first lower straight tube, a second lower straight tube, a partition and a servo motor; wherein: The servo motor is installed on the top of the shell and is transmission-connected to the partition located in the inner cavity of the shell, and can drive the partition to rotate horizontally; the partition divides the inner cavity of the shell into two chambers, namely the first chamber and the second chamber; the tops of the first chamber and the second chamber are connected; the upper straight tube is arranged at the top of the shell and is connected to the first chamber; the first lower straight tube is arranged at the bottom of the shell and is connected to the first chamber; the second lower straight tube is arranged at the bottom of the shell and is connected to the second chamber.

3. The air conditioning system according to claim 1, characterized in that The liquid storage tank includes a second liquid storage tank, which is a hollow tank structure with a storage cavity inside; the air inlet path is connected to the top of the second liquid storage tank; the liquid inlet pipeline and the liquid outlet pipeline are both connected to the bottom of the second liquid storage tank.

4. The air conditioning system according to claim 2, characterized in that It also includes a pressure stabilizing unit connected to the compressor suction and exhaust ports respectively to achieve pressure balance on both sides of the compressor suction and exhaust ports, and 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 pipelines of the suction and exhaust ports of the compressor; the first pressure stabilizing solenoid valve is arranged on the first pressure stabilizing bypass.

5. The air conditioning system according to claim 3, characterized in that It also includes a pressure stabilizing unit connected to the compressor intake and exhaust ports respectively to achieve pressure balance on both sides of the compressor intake and exhaust ports, and 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 intake port, and the other end is connected to the top of the second liquid storage tank; the second pressure stabilizing solenoid valve is arranged on the second pressure stabilizing bypass.

6. A control method, characterized in that: A method for controlling non-stop defrosting of an air-conditioning system according to any one of claims 1 to 5, the method comprising at least the following steps: The air conditioning system turns on the heating mode and turns off the voltage stabilizing unit; When defrosting is required, some solenoid valves in the liquid storage unit are controlled to open, while others are closed, so that liquid refrigerant from the indoor unit is extracted and stored in the liquid storage tank when the air conditioner is heating. The pressure stabilizing unit is then controlled to open to balance the pressure on both sides of the compressor suction and exhaust ports, completing the preparations for defrosting. After the defrosting preparation is completed, the first four-way valve is reversed without stopping the machine, and then the voltage stabilizing unit is closed, and the other solenoid valve in the liquid storage unit is controlled to open, and some solenoid valves are closed, so that the high-pressure gaseous refrigerant at the compressor exhaust port pushes the liquid refrigerant in the liquid storage tank to flow out and enter the outdoor unit, and mixes with the refrigerant entering the outdoor unit through the four-way valve at the compressor exhaust port, and the outdoor unit starts defrosting; After defrosting is completed, the liquid storage unit is closed and the pressure stabilizing unit is opened to balance the pressure on both sides of the compressor suction and exhaust ports, completing the heating preparation; After the heating preparation is completed, the first four-way valve is reversed without stopping the machine, and then the voltage stabilizing unit is closed to start normal heating.

Images