Split type refrigerant leakage processing system

Abstract

The utility model relates to a split type refrigerant leakage processing system. Comprising an outer unit, an inner unit and a refrigerant storage device, the outer unit comprises a compressor, a change-over valve, a first refrigerant detector, a first electromagnetic valve and a second electromagnetic valve, the change-over valve is connected to the compressor, the first electromagnetic valve is connected to the change-over valve, the second electromagnetic valve is connected to the compressor, and the change-over valve is used for changing unit working modes; the first refrigerant detector is used for detecting whether refrigerant leakage happens to the outer unit or not. The inner unit and the outer unit are connected through a first channel and a second channel, the inner unit comprises a second refrigerant detector used for detecting whether refrigerant leakage happens to the inner unit or not, the first electromagnetic valve is used for controlling on-off of the first channel, and the second electromagnetic valve is used for controlling on-off of the second channel. The refrigerant storer is provided with a storage cavity connected to the outer unit, and the storage cavity is used for storing leaked refrigerants. The problem that in the prior art, a split type unit is prone to refrigerant leakage, and consequently potential safety hazards exist in the unit is solved.

Description

Technical Field

[0001] This application relates to the technical field of refrigerant recovery, and particularly to a split-type refrigerant leakage treatment system. Background Art

[0002] In recent years, with the continuous progress of refrigeration technology and the increasing awareness of environmental protection, refrigerants R32 and R290 have been increasingly widely used in the refrigeration industry due to their high efficiency and environmental friendliness. However, the flammable and explosive characteristics of these two refrigerants have also brought unprecedented challenges, especially in the application of complex systems such as split-type units, and their leakage problems have become the focus of attention inside and outside the industry. R32, namely difluoromethane, as a new type of environmentally friendly refrigerant, has a much lower global warming potential (GWP) than traditional R410A and R22, so it performs excellently in energy conservation and emission reduction. However, the flammability of R32 cannot be ignored. Once leaked and encountered an open flame or high temperature, it is extremely easy to cause a fire or even an explosion, posing a serious threat to personnel safety and equipment integrity. Similarly, R290, namely propane, as a natural refrigerant, is also favored due to its high efficiency, low cost and environmental protection characteristics. But the flammability and explosiveness of propane are more significant, and its explosion limit range is wider. Once leaked into the air and reaches a certain concentration, it will catch fire when encountering a fire, and the consequences will be unimaginable.

[0003] In complex refrigeration systems such as split-type units, due to the large number of pipe connection points and high sealing requirements, the risk of refrigerant leakage increases significantly. Once the unit leaks, it often means that the system has lost its due refrigeration capacity and may even be in an abnormal working state, which not only affects the operation efficiency and service life of the equipment, but also poses a potential threat to the environment and personnel safety. More seriously, many manufacturers have not fully considered the emergency treatment measures after refrigerant leakage during the design and production process, resulting in a lack of effective response means when problems occur, further exacerbating the severity of the situation. Therefore, in view of the leakage problems of flammable and explosive refrigerants such as R32 and R290, effective measures need to be taken to solve them.

[0004] For the above problems, no effective solutions have been proposed yet. Utility Model Content

[0005] This application provides a split-type refrigerant leakage treatment system to solve the technical problem that the split-type unit is prone to refrigerant leakage, resulting in relatively low safety of the unit. By taking corresponding actions at the leakage points of the inner unit and the outer unit when the split-type unit leaks refrigerant, and closing different solenoid valves and compressors to recover the refrigerant into the refrigerant storage, the safety of the split-type unit can be improved.

[0006] According to one aspect of the embodiments of this application, this application provides a split-type refrigerant leakage treatment system, including:

[0007] An outdoor unit, the outdoor unit includes a compressor, a switching valve, a first refrigerant detector, a first solenoid valve and a second solenoid valve. The switching valve is connected to the compressor. The first solenoid valve is connected to the switching valve, and the second solenoid valve is connected to the compressor. The switching valve is used to switch the operating mode of the unit, and the first refrigerant detector is used to detect whether there is refrigerant leakage in the outdoor unit;

[0008] An indoor unit, which is interconnected with the outdoor unit through a first channel and a second channel. The indoor unit includes a second refrigerant detector for detecting whether there is refrigerant leakage in the indoor unit. The first solenoid valve is connected to the indoor unit through the first channel. The first solenoid valve is used to control the on / off of the first channel according to the operating mode of the unit. The second solenoid valve is connected to the indoor unit through the second channel. The second solenoid valve is used to control the on / off of the second channel according to the operating mode of the unit;

[0009] A refrigerant storage, the refrigerant storage is connected to the outdoor unit. The refrigerant storage is provided with a storage chamber, an exhaust chamber and an elastic component. The storage chamber is connected to the outdoor unit and is used to store the leaked refrigerant. The exhaust chamber is separated from the storage chamber by the elastic component and is used to adjust the pressure balance between the storage chamber and the exhaust chamber through the elastic component when refrigerant leakage occurs.

[0010] Optionally, the outdoor unit further includes a first heat exchanger, a regulating valve and a vapor-liquid separator. The switching valve includes a first interface, a second interface, a third interface and a fourth interface arranged in sequence. The first interface, the regulating valve and the first solenoid valve are connected in sequence. The second interface is connected to the second solenoid valve. The third interface is connected to one end of the vapor-liquid separator. The other end of the vapor-liquid separator is connected to the compressor. The fourth interface is connected to the compressor and the refrigerant storage. The regulating valve is used to regulate the refrigerant flow rate in the outdoor unit, and the vapor-liquid separator is used to separate the refrigerant in the outdoor unit into vapor and liquid.

[0011] Optionally, the outdoor unit further includes a first stop valve and a second stop valve. The first stop valve is arranged in the first channel, and the second stop valve is arranged in the second channel. The first stop valve is used to throttle and reduce the pressure of the first channel, and the second stop valve is used to throttle and reduce the pressure of the second channel.

[0012] Optionally, the external unit further includes a first heat exchanger disposed between the first interface of the conversion valve and the regulating valve. The first heat exchanger is configured to exchange heat for the refrigerant in the external unit. The internal unit further includes a second heat exchanger connected to the first channel and the second channel respectively. The second heat exchanger is configured to exchange heat for the refrigerant in the internal unit.

[0013] Optionally, the refrigerant storage further includes a third solenoid valve, a manual valve, and a fourth solenoid valve. The third solenoid valve is respectively connected to the external unit and the storage chamber, and is configured to control the on / off of the third channel for transmitting the refrigerant to the storage chamber. The manual valve is connected to the storage chamber and is configured to control the on / off of the fourth channel for exhausting the refrigerant from the storage chamber. The fourth solenoid valve is connected to the exhaust chamber and is configured to control the on / off of the fifth channel for exhausting the exhaust chamber.

[0014] Optionally, when the unit operating mode is the refrigeration mode and refrigerant leakage occurs in the internal unit or the external unit, the first solenoid valve is closed and the second solenoid valve is opened to allow the refrigerant in the internal unit to enter the external unit. After the internal unit has a low-pressure protection action, the compressor and the second solenoid valve are synchronously closed to prevent the refrigerant entering the external unit from flowing back into the internal unit. The third solenoid valve and the fourth solenoid valve are synchronously opened to allow the refrigerant in the external unit to enter the storage chamber. After all the refrigerant in the external unit has entered the storage chamber, the third solenoid valve and the fourth solenoid valve are closed.

[0015] Optionally, when the unit operating mode is the heating mode and refrigerant leakage occurs in the internal unit or the external unit, the first solenoid valve is opened and the second solenoid valve is closed to allow the refrigerant in the internal unit to enter the external unit. After the internal unit has a low-pressure protection action, the compressor and the first solenoid valve are synchronously closed to prevent the refrigerant entering the external unit from flowing back into the internal unit. The third solenoid valve and the fourth solenoid valve are synchronously opened to allow the refrigerant in the external unit to enter the storage chamber. After all the refrigerant in the external unit has entered the storage chamber, the third solenoid valve and the fourth solenoid valve are closed.

[0016] Optionally, the first heat exchanger adopts a fin heat exchanger, the second heat exchanger adopts a plate heat exchanger, and the regulating valve adopts an electronic expansion valve.

[0017] Optionally, the elastic component includes a slider and a spring assembly. The spring assembly includes at least one spring that acts on the slider, and the slider separates the storage chamber and the exhaust chamber.

[0018] Optionally, the spring is disposed in the storage cavity. One end of the spring is connected to the bottom of the storage cavity, and the other end of the spring is connected to the slider so that the slider slides back and forth in the extending direction of the storage cavity towards the exhaust cavity.

[0019] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the related technologies:

[0020] In this application, by respectively arranging refrigerant detectors in the outdoor unit and the indoor unit, real-time monitoring of refrigerant leakage is achieved, greatly improving the early warning ability of the system for potential safety risks. The system can automatically adjust the refrigerant flow path according to the operating mode of the unit, which not only ensures the normal operation of the unit but also can quickly cut off the refrigerant supply when leakage is detected to prevent the leakage from expanding. The refrigerant storage device is designed with a storage cavity and an exhaust cavity, and the pressure balance between the two is adjusted by an elastic component. When refrigerant leaks, the storage cavity can safely collect the leaked refrigerant, reducing environmental pollution. At the same time, a channel and a valve for refrigerant recovery are provided for subsequent refrigerant treatment and reuse. Through the coordinated operation of the switching valve, the first solenoid valve, and the second solenoid valve, the system can automatically adjust the refrigerant flow path according to the operating mode of the unit to ensure that the leakage source can be quickly cut off when refrigerant leaks, preventing the leakage from expanding, and improving the automation level and emergency response ability of the system. Components such as the first heat exchanger, regulating valve, and vapor-liquid separator integrated in the outdoor unit not only improve the operating efficiency of the system but also reduce energy consumption and operating costs by optimizing the refrigerant flow rate and the vapor-liquid separation process. The second heat exchanger in the indoor unit further enhances the heat exchange capacity of the system and improves the energy efficiency ratio. By real-time monitoring the refrigerant leakage conditions of the indoor unit and the outdoor unit and intelligently controlling the on-off of the solenoid valve in combination with the operating mode of the unit, when refrigerant leaks, the refrigerant in the indoor unit can be quickly guided to the outdoor unit, effectively preventing further refrigerant loss. The system has a low-pressure protection action detection function. Once it detects that the indoor unit has a low-pressure protection action, it will immediately shut down the compressor and adjust the state of the solenoid valve to avoid damage to the unit due to too low pressure. During the refrigerant leakage treatment process, by opening the third solenoid valve and the fourth solenoid valve, the refrigerant in the outdoor unit enters the storage cavity and is exhausted through the exhaust cavity to increase the volume of the storage cavity, so as to safely collect the leaked refrigerant and reduce the environmental pollution caused by the refrigerant. Description of the Drawings

[0021] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0022] To more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, for those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a schematic diagram of a split refrigerant leakage treatment system in a heating state provided according to an embodiment of the present application;

[0024] Figure 2 It is a schematic diagram of a split refrigerant leakage treatment system in a cooling state provided according to an embodiment of the present application;

[0025] Figure 3 It is a schematic diagram of a refrigerant storage provided according to an embodiment of the present application.

[0026] Reference numerals:

[0027] 1. Outdoor unit; 11. Compressor; 12. Conversion valve; 13. First refrigerant detector; 14. First solenoid valve; 15. Second solenoid valve; 16. Regulating valve; 17. Gas-liquid separator; 181. First stop valve; 182. Second stop valve; 19. First heat exchanger; 201. First channel; 202. Second channel; 2. Indoor unit; 21. Second refrigerant detector; 22. Second heat exchanger; 3. Refrigerant storage; 31. Storage chamber; 32. Exhaust chamber; 33. Third solenoid valve; 34. Manual valve; 35. Fourth solenoid valve; 361. Third channel; 362. Fourth channel; 363. Fifth channel; 37. Slide block; 381. First spring; 382. Second spring. Detailed implementation manners

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0029] In subsequent descriptions, suffixes such as "module", "component", or "unit" used to represent elements are only for the convenience of description of the present application, and they have no specific meaning in themselves. Therefore, "module" and "component" can be used interchangeably.

[0030] In the related art, refrigerant leakage is likely to occur in a split unit due to pipeline connection points. When refrigerant leakage occurs in a split unit, it is generally in a state without refrigerant or an abnormal working state, resulting in the inability to effectively recover the refrigerant, posing a certain safety hazard.

[0031] To solve the problems mentioned in the background art, referring to Figure 1 、 Figure 2 and Figure 3 as shown, this embodiment provides a split refrigerant leakage treatment system. It includes an external unit 1, an internal unit 2, and a refrigerant storage 3. Among them, the external unit includes a compressor 11, a conversion valve 12, a first refrigerant detector 13, a first solenoid valve 14, and a second solenoid valve 15. The conversion valve 12 is connected to the compressor 11, the first solenoid valve 14 is connected to the conversion valve 12, and the second solenoid valve 15 is connected to the compressor 11. The conversion valve 12 is used to convert the working mode of the unit, and the first refrigerant detector 13 is used to detect whether refrigerant leakage occurs in the external unit 1. The internal unit 2 and the external unit 1 are interconnected through a first channel 201 and a second channel 202. The internal unit 2 includes a second refrigerant detector 21 for detecting whether refrigerant leakage occurs in the internal unit 2. The first solenoid valve 14 is connected to the internal unit 2 through the first channel 201, and the first solenoid valve 14 is used to control the opening and closing of the first channel 201 according to the working mode of the unit. The second solenoid valve 15 is connected to the internal unit 2 through the second channel 202, and the second solenoid valve 15 is used to control the opening and closing of the second channel 202 according to the working mode of the unit. The refrigerant storage 3 is connected to the external unit 1. The refrigerant storage 3 is provided with a storage chamber 31, an exhaust chamber 32, and an elastic component. The storage chamber 31 is connected to the external unit 1, and the storage chamber 31 is used to store the leaked refrigerant. The exhaust chamber 32 is separated from the storage chamber 31 by the elastic component, and the exhaust chamber 32 is used to adjust the pressure balance between the storage chamber 31 and the exhaust chamber 32 through the elastic component when refrigerant leakage occurs.

[0032] Understandably, this embodiment mainly detects the leakage of refrigerant in the split unit. When refrigerant leakage occurs, all the refrigerant in the inner unit 2 is transferred to the outer unit 1 and then to the refrigerant storage 3 from the outer unit 1. The split unit of this embodiment includes two modes: a refrigeration mode and a heating mode. The refrigerant states of the outer unit 1 and the inner unit 2 are respectively monitored in real time by the first refrigerant detector 13 and the second refrigerant detector 21. Once a leakage is detected, the corresponding first solenoid valve 14 and second solenoid valve 15 are triggered to act, so as to readjust the opening and closing of the first channel 201 and the second channel 202, enabling the refrigerant in the inner unit 2 to enter the outer unit 1 from the first channel 201 or the second channel 202. When the split unit is in normal operation without refrigerant leakage, the first solenoid valve 14 and the second solenoid valve 15 are in the normally open state, so that the first channel 201 and the second channel 202 are in the conducting state, and the refrigerant can circulate between the outer unit 1, the first channel 201, the inner unit 2 and the second channel 202 to achieve the refrigeration function or the heating function of the split unit.

[0033] In the above embodiment, by respectively arranging refrigerant detectors in the outer unit 1 and the inner unit 2, the position of refrigerant leakage can be detected and located in real time. Whether the leakage occurs in the outer unit 1 or the inner unit 2, it can be quickly discovered, thus avoiding the continuous loss of refrigerant and potential environmental pollution. By the coordinated operation of the switching valve 12, the first solenoid valve 14 and the second solenoid valve 15, the flow of refrigerant between the inner and outer units 1 can be intelligently controlled according to the working mode of the unit. When a leakage is detected, the refrigerant supply can be quickly cut off to prevent the leakage from expanding. The refrigerant storage 3 enables the leaked refrigerant to be effectively collected and stored in the storage cavity 31, avoiding the direct discharge of refrigerant into the environment and protecting the ecological environment. In addition, the storage cavity 31 and the exhaust cavity 32 are separated by an elastic component, which can automatically adjust the pressure balance between the two when refrigerant leakage occurs, ensuring the safety and stability of the storage process. By integrating the refrigerant leakage detection and treatment functions, the overall safety and reliability are significantly improved. Even when refrigerant leakage occurs, the system can quickly respond and take measures to reduce potential safety hazards and property losses.

[0034] Further, the external unit 1 further includes a regulating valve 16 and a vapor-liquid separator 17. The switching valve 12 is a four-way valve including four interfaces. The switching valve 12 includes a first interface, a second interface, a third interface, and a fourth interface arranged in sequence. The first interface, the regulating valve 16, and the first solenoid valve 14 are connected in sequence. The second interface is connected to the second solenoid valve 15. The third interface is connected to one end of the vapor-liquid separator 17. The other end of the vapor-liquid separator 17 is connected to the compressor 11. The fourth interface is connected to the compressor 11 and the refrigerant storage 3. The regulating valve 16 is used to regulate the refrigerant flow rate in the external unit 1. The vapor-liquid separator 17 is used to separate the vapor and liquid of the refrigerant in the external unit 1. In a split-type unit, the refrigerant exists in gaseous and liquid forms. If the liquid refrigerant directly enters the compressor 11, due to the incompressibility of the liquid refrigerant, a liquid hammer phenomenon will occur inside the compressor 11, thereby damaging the compressor 11. By using the vapor-liquid separator 17 to separate the vapor and liquid of the mixed refrigerant, the situation where liquid refrigerant enters the compressor 11 will not occur.

[0035] In the above embodiment, the vapor-liquid separator 17 ensures that the refrigerant entering the compressor 11 is pure steam, avoiding damage to the compressor 11 caused by liquid refrigerant, thereby prolonging the service life of the compressor 11 and improving the overall operating efficiency of the system. The regulating valve 16 enables the system to regulate the refrigerant flow rate as needed, contributing to maintaining the stability of the internal pressure of the system and enhancing the stability and adaptability of the system. Through the effective operation of the vapor-liquid separator 17 in combination with the compressor 11, the risk of damage to the compressor 11 caused by the impact of liquid refrigerant is reduced, further improving the operating stability and reliability of the system.

[0036] Further, the external unit 1 further includes a first stop valve 181 and a second stop valve 182. The first stop valve 181 is arranged in the first channel 201, and the second stop valve 182 is arranged in the second channel 202. The first stop valve 181 is used to throttle and reduce the pressure of the first channel 201, and the second stop valve 182 is used to throttle and reduce the pressure of the second channel 202. The first stop valve 181 and the second stop valve 182 are mainly used to throttle and reduce the pressure of the unit. By reducing the channel cross-section of the refrigerant in the first channel 201 and the second channel 202, the flow rate of the refrigerant will increase. At the same time, due to the friction between the refrigerant and the inner walls of the first channel 201 and the second channel 202, energy loss will occur, resulting in a decrease in the static pressure of the refrigerant.

[0037] In the above embodiments, the throttling and pressure-reducing functions of the first shut-off valve 181 and the second shut-off valve 182 ensure that the pressure of the refrigerant can be effectively regulated and controlled when passing through these two channels, which helps to maintain the stability of the internal pressure of the system, prevent damage to the system equipment due to too high or too low pressure, and thus extend the service life of the equipment. By precisely controlling the flow rate and pressure of the refrigerant, the first shut-off valve 181 and the second shut-off valve 182 help to optimize the refrigeration / heating efficiency of the system. At an appropriate pressure, the heat transfer efficiency of the refrigerant is higher, thereby improving the overall energy efficiency of the system, reducing energy consumption and operating costs.

[0038] Further, the outdoor unit 1 further includes a first heat exchanger 19. The first heat exchanger 19 is disposed between the first interface of the switching valve 12 and the regulating valve 16. The first heat exchanger 19 is used for heat exchange between the refrigerant and air in the outdoor unit 1. The indoor unit 2 further includes a second heat exchanger 22. The second heat exchanger 22 is respectively connected to the first channel 201 and the second channel 202. The second heat exchanger 22 is used for heat exchange between the refrigerant and air in the indoor unit 2.

[0039] It can be understood that the operating principle of the split refrigerant leakage treatment system in this embodiment includes: when the unit is in the heating mode, the refrigerant is discharged from the compressor 11 and then enters the four-way valve (switching valve 12). After switching to the heating state through the four-way valve, it then enters the first heat exchanger 19. After the refrigerant exchanges heat with water, it then passes through the regulating valve 16 for throttling and enters the second heat exchanger 22 for heat exchange. Then, it passes through the four-way valve again and flows into the gas-liquid separator 17, and returns to the compressor 11. When the unit is in the cooling mode, the refrigerant is discharged from the compressor 11 and enters the four-way valve. The four-way valve switches to the cooling state, and then enters the first heat exchanger 19. After the refrigerant exchanges heat with air, it then passes through the regulating valve 16 for throttling and enters the second heat exchanger 22 for heat exchange. Then, it passes through the four-way valve again and flows into the gas-liquid separator 17, and returns to the compressor 11.

[0040] In the above embodiments, by providing the first heat exchanger 19 in the outdoor unit 1 responsible for heat exchange in the early stage of the refrigerant cycle, it helps to adjust the temperature and pressure of the refrigerant before it enters the compressor 11, thereby improving the operating efficiency of the compressor 11 and reducing energy consumption. At the same time, by effectively utilizing the heat or cold of the external environment, the first heat exchanger 19 can further enhance the overall energy efficiency of the system. By providing the second heat exchanger 22 in the indoor unit 2 directly involved in the heat exchange of the refrigerant in the indoor unit 2, the system can more efficiently adjust the indoor temperature to meet the comfort needs of users. At the same time, the presence of the second heat exchanger 22 also reduces the direct heat exchange requirement between the indoor unit 2 and the outdoor environment, reducing the heat loss of the system. The introduction of the heat exchanger makes the temperature and pressure changes of the refrigerant during the circulation process more stable, helping to reduce the temperature fluctuations and pressure shocks inside the system, thereby protecting the system equipment from damage and extending the service life of the equipment. Especially in high-temperature or low-temperature environments, the heat exchanger can effectively adjust the temperature of the refrigerant to prevent key components such as the compressor 11 from malfunctioning due to overheating or overcooling.

[0041] Furthermore, the refrigerant storage 3 further includes a third solenoid valve 33, a manual valve 34, and a fourth solenoid valve 35. The third solenoid valve 33 is respectively connected to the outdoor unit 1 and the storage chamber 31. The third solenoid valve 33 is used to control the on-off of the third channel 361 for transmitting the refrigerant to the storage chamber 31. The manual valve 34 is connected to the storage chamber 31. The manual valve 34 is used to control the on-off of the fourth channel 362 for exhausting the refrigerant in the storage chamber 31. The fourth solenoid valve 35 is connected to the exhaust chamber 32. The fourth solenoid valve 35 is used to control the on-off of the fifth channel 363 for exhausting the gas in the exhaust chamber 32.

[0042] In this embodiment, when the unit is operating normally, the first solenoid valve 14 and the second solenoid valve 15 are in the normally open state, and the third solenoid valve 33 and the fourth solenoid valve 35 are in the normally closed state. Because when the unit is operating normally, there is no refrigerant leakage, and there is no need to store the refrigerant in the unit into the refrigerant storage 3. Therefore, the third solenoid valve 33 for recovering the refrigerant in the refrigerant storage 3 is set to the normally closed state, so that the refrigerant in the outdoor unit 1 will not enter the storage chamber 31 in the refrigerant storage 3. The fourth solenoid valve 35 for exhausting the refrigerant in the storage chamber 31 in the refrigerant storage 3 is set to the normally closed state, and the refrigerant in the storage chamber 31 will not be exhausted, so that a balanced state is maintained between the storage chamber 31 and the exhaust chamber 32.

[0043] In the above embodiments, by controlling the opening and closing of the third solenoid valve 33 for the third channel 361, it is possible to precisely control when the refrigerant in the external unit 1 enters the storage chamber 31 for storage, which helps to quickly collect and store the refrigerant when it leaks, preventing it from further leaking into the environment. The manual valve 34 is responsible for controlling the discharge of the refrigerant in the storage chamber 31. When the refrigerant needs to be discharged, the manual valve 34 can be opened to safely discharge the refrigerant in the storage chamber 31 to a designated position, ensuring the smooth progress of the operation. By controlling the exhaust process of the exhaust chamber 32 with the fourth solenoid valve 35, the exhaust rate and exhaust volume can be precisely controlled to ensure the stability and safety of the internal pressure of the system.

[0044] Further, when the working mode of the unit is the refrigeration mode and refrigerant leakage occurs in the internal unit 2 or the external unit 1, the first solenoid valve 14 is closed and the second solenoid valve 15 is opened to allow the refrigerant in the internal unit 2 to enter the external unit 1. When the internal unit 2 has a low-pressure protection operation, the compressor 11 and the second solenoid valve 15 are synchronously closed to prevent the refrigerant entering the external unit 1 from flowing back into the internal unit 2. The third solenoid valve 33 and the fourth solenoid valve 35 are synchronously opened to allow the refrigerant in the external unit 1 to enter the storage chamber 31. When all the refrigerant in the external unit 1 has entered the storage chamber 31, the third solenoid valve 33 and the fourth solenoid valve 35 are closed.

[0045] In the above embodiments, in the refrigeration mode and when refrigerant leakage is detected, by precisely controlling the opening and closing states of each solenoid valve, the situation of refrigerant leakage in the internal unit 2 or the external unit 1 is effectively addressed. When refrigerant leakage is detected, the first solenoid valve 14 is closed to prevent further loss of the refrigerant. At the same time, the second solenoid valve 15 is opened to guide the refrigerant in the internal unit 2 to be safely transferred to the external unit 1, and the buffer capacity of the external unit 1 is used to temporarily store the refrigerant. If the internal unit 2 has a low-pressure protection operation, the compressor 11 and the second solenoid valve 15 are synchronously closed to ensure that the refrigerant does not flow back into the internal unit 2, further protecting the system safety. Subsequently, the third solenoid valve 33 and the fourth solenoid valve 35 are synchronously opened to orderly collect the refrigerant in the external unit 1 into the storage chamber 31 until all the refrigerant is safely transferred, reducing refrigerant loss and also avoiding a decline in system performance caused by refrigerant leakage, ensuring the stable operation and high efficiency of the unit in the refrigeration mode.

[0046] Further, when the working mode of the unit is the heating mode and refrigerant leakage occurs in the internal unit 2 or the external unit 1, the first solenoid valve 14 is opened and the second solenoid valve 15 is closed to allow the refrigerant in the internal unit 2 to enter the external unit 1. When the internal unit 2 has a low-pressure protection operation, the compressor 11 and the first solenoid valve 14 are synchronously closed to prevent the refrigerant entering the external unit 1 from flowing back into the internal unit 2. The third solenoid valve 33 and the fourth solenoid valve 35 are synchronously opened to allow the refrigerant in the external unit 1 to enter the storage chamber 31. When all the refrigerant in the external unit 1 has entered the storage chamber 31, the third solenoid valve 33 and the fourth solenoid valve 35 are closed.

[0047] In the above embodiment, when in the heating mode and refrigerant leakage is detected, the first solenoid valve 14 is opened while the second solenoid valve 15 is closed, allowing the refrigerant in the indoor unit 2 to enter the outdoor unit 1 for temporary storage using the capacity of the outdoor unit 1, thereby reducing the pressure of the indoor unit 2. If the indoor unit 2 triggers a low-pressure protection action, the compressor 11 and the first solenoid valve 14 are synchronously closed. This immediate response mechanism effectively prevents the refrigerant from flowing back from the outdoor unit 1 to the indoor unit 2, avoiding further damage to the system. Subsequently, the third and fourth solenoid valves 35 are synchronously opened to work together to safely transfer the refrigerant in the outdoor unit 1 to the storage chamber 31, ensuring the complete recovery of the refrigerant. This not only improves the reliability of the unit in the heating mode but also reduces the impact of refrigerant leakage on the system performance through an intelligent control strategy.

[0048] Furthermore, the first heat exchanger 19 adopts a finned heat exchanger, the second heat exchanger 22 adopts a plate heat exchanger, and the regulating valve 16 adopts an electronic expansion valve.

[0049] In the above embodiment, the finned heat exchanger has a large heat transfer area, enabling more efficient heat transfer, which helps to achieve a higher heat exchange efficiency within a limited space and enhances the refrigeration / heating efficiency of the outdoor unit 1. The plate heat exchanger has a high heat transfer coefficient and can achieve a large heat transfer amount with a small heat exchange area. The narrow channels formed between the plates contribute to the generation of strong turbulent flows (turbulence) in the fluid at extremely low flow rates, further improving the heat transfer efficiency and optimizing the temperature regulation efficiency of the indoor unit 2. The regulating valve 16 adopts an electronic expansion valve. The electronic expansion valve can accurately control the cooling effect by automatically adjusting the liquid flow rate according to the system requirements, ensuring the stability and efficiency of the system operation and avoiding the inaccurate regulation problems that may exist in traditional mechanical expansion valves. The electronic expansion valve can continuously monitor the change in the system working load and adjust the refrigerant flow rate accordingly to adapt to different working conditions, enabling the system to maintain a stable operating state in various environments and improving the reliability and stability of the system. By precisely controlling the refrigerant flow rate, the electronic expansion valve makes the refrigeration cycle more stable, reduces the load fluctuations of the condenser and evaporator, not only improves the system operation efficiency but also reduces the energy consumption. The electronic expansion valve has a fast response speed and can quickly adjust the flow rate according to the system command, thereby shortening the time for the system to reach a stable state.

[0050] Furthermore, the elastic component includes a slider 37 and a spring assembly. The spring assembly includes at least one spring. In this embodiment, two springs are provided, such as Figure 3 the first spring 381 and the second spring 382 shown in the figure. The first spring 381 and the second spring 382 act on the slider 37 together, and the slider 37 separates the storage chamber 31 and the exhaust chamber 32.

[0051] In this embodiment, the exhaust chamber 32 in the refrigerant storage is filled with environmentally friendly high-pressure gas through the fifth channel 363. The storage chamber 31 is evacuated in advance through the fourth channel 362. Due to the high-pressure gas in the storage chamber 31 and the vacuum state, the slider and the spring are compressed to the lowest point.

[0052] In the above embodiment, by providing an elastic component including a slider and at least one spring, the elastic force of the spring acts on the slider 37, realizing effective separation and dynamic sealing between the storage chamber 31 and the exhaust chamber 32, enhancing the sealing performance and stability of the system, reducing the leakage risk caused by vibration or pressure change, improving the adaptability of the system to different working conditions, and ensuring the long-term stable operation of the system.

[0053] Optionally, the spring is arranged in the storage chamber. One end of the spring is connected to the bottom of the storage chamber 31, and the other end of the spring is connected to the slider 37 so that the slider 37 slides back and forth in the extending direction of the storage chamber 31 towards the exhaust chamber 32.

[0054] In the above embodiment, one end of the spring is fixed to the bottom of the storage chamber 31, and the other end is connected to the slider 37, enabling the slider 37 to automatically return to its initial position through the elastic force of the spring after completing its exhaust or intake function. This automatic reset function not only improves the automation degree of the refrigerant storage 3 but also reduces the need for manual intervention and improves work efficiency. When the slider 37 moves rapidly or is impacted, the spring can absorb part of the energy and play a buffering role to protect the slider 37 and related components from damage.

[0055] According to an aspect of the embodiments of the present application, an embodiment of the control method for the above split-type refrigerant leakage treatment system is provided. The control method includes the following steps:

[0056] Step S402, detecting the refrigerant leakage conditions of the indoor unit 2 and the outdoor unit 1 and controlling the on-off of the first solenoid valve 14 and the second solenoid valve 15 according to the refrigerant leakage conditions in combination with the unit working mode, so that the leaked refrigerant in the indoor unit 2 enters the outdoor unit 1.

[0057] Step S404, when it is detected that the indoor unit 2 has a low-pressure protection action, turning off the compressor 11 and controlling the on-off of the first solenoid valve 14 and the second solenoid valve 15.

[0058] Step S406, simultaneously opening the third solenoid valve 33 and the fourth solenoid valve 35 to allow the refrigerant in the outdoor unit 1 to enter the storage chamber 31, and exhausting through the exhaust chamber 32 to increase the volume of the storage chamber 31.

[0059] Step S408, when the volume of the storage chamber 31 no longer increases, closing the third solenoid valve 33.

[0060] In the above embodiments, by monitoring the refrigerant leakage of the inner unit 2 and the outer unit 1 in real time, refrigerant leakage events can be quickly identified and responded to. When refrigerant leakage is detected, the opening and closing of the solenoid valve are immediately adjusted according to the leakage situation and the working mode of the unit, and the refrigerant leaked from the inner unit 2 is guided into the outer unit 1, effectively preventing further loss of refrigerant and environmental pollution. When it is detected that the inner unit 2 has a low-pressure protection action, the compressor 11 is immediately shut down, and the opening and closing of the relevant solenoid valves are controlled, preventing damage to the unit caused by low pressure, not only protecting the safety of the unit, but also avoiding a larger-scale refrigerant leakage caused by unit failure. By simultaneously opening the third solenoid valve 33 and the fourth solenoid valve 35, the refrigerant of the outer unit 1 enters the storage cavity 31 and is exhausted through the exhaust cavity 32, realizing the rapid collection of the leaked refrigerant. During the collection process, as the exhaust cavity 32 exhausts, the volume of the storage cavity 31 gradually increases, capable of accommodating more leaked refrigerant.

[0061] Specifically, step S402 includes:

[0062] Determine the working mode of the unit, and detect the refrigerant leakage of the inner unit 2 by the second refrigerant detector 21 within a preset time;

[0063] If the inner unit 2 has refrigerant leakage and the working mode of the unit is the refrigeration mode, then close the first solenoid valve 14 and open the second solenoid valve 15 to make the refrigerant of the inner unit 2 enter the outer unit 1; detect the refrigerant leakage of the outer unit 1 by the first refrigerant detector 13 within a preset time; if the outer unit 1 has refrigerant leakage, then close the first solenoid valve 14 and open the second solenoid valve 15 to make the refrigerant of the inner unit 2 enter the outer unit 1;

[0064] Synchronously, if the inner unit 2 has refrigerant leakage and the working mode of the unit is the heating mode, then open the first solenoid valve 14 and close the second solenoid valve 15 to make the refrigerant of the inner unit 2 enter the outer unit 1; detect the refrigerant leakage of the outer unit 1 by the first refrigerant detector 13 within a preset time, if the outer unit 1 has refrigerant leakage, then open the first solenoid valve 14 and close the second solenoid valve 15 to make the refrigerant of the inner unit 2 enter the outer unit 1.

[0065] In the above-described embodiments, by respectively providing refrigerant detectors in the inner unit 2 and the outer unit 1 and performing detections within a preset time, the situation of refrigerant leakage can be accurately identified. Once leakage is detected, corresponding control measures can be quickly taken according to the current operating mode (cooling or heating) of the unit to ensure that the refrigerant leakage is promptly and effectively handled. In the cooling mode, if refrigerant leakage occurs in the inner unit 2, by closing the first solenoid valve 14 and opening the second solenoid valve 15, the refrigerant in the inner unit 2 is guided into the outer unit 1 to prevent further loss of the refrigerant. In the heating mode, the opposite operation is taken, that is, opening the first solenoid valve 14 and closing the second solenoid valve 15, to achieve the same purpose, ensuring that the system can effectively respond to refrigerant leakage in different operating modes. By promptly closing or opening the solenoid valve, the further loss of the refrigerant from the leakage point can be effectively prevented. At the same time, guiding the refrigerant in the inner unit 2 to the outer unit 1 also avoids the decline or damage of the unit performance caused by insufficient refrigerant in the inner unit 2.

[0066] Specifically, step S404 includes:

[0067] Real-time detect whether a low-pressure protection action occurs in the inner unit 2;

[0068] If it is detected that a low-pressure protection action occurs and the unit operating mode is the cooling mode, then turn off the compressor 11 and simultaneously close the second solenoid valve 15;

[0069] Synchronously, if it is detected that a low-pressure protection action occurs and the unit operating mode is the heating mode, then turn off the compressor 11 and simultaneously close the first solenoid valve 14.

[0070] In the above-described embodiments, by real-time detecting whether a low-pressure protection action occurs in the inner unit 2 and precisely controlling the on / off of the solenoid valve according to the current operating mode of the unit. Once a low-pressure protection action is detected, the system immediately turns off the compressor 11 and correspondingly closes the second solenoid valve 15 (cooling mode) or the first solenoid valve 14 (heating mode), thereby quickly stabilizing the unit state, preventing further failures, ensuring the safe and stable operation of the system, and extending the service life of the unit.

[0071] Set the preset time for refrigerant leakage detection of the first refrigerant detector 13 and the second refrigerant detector 21 to 30 seconds. When the unit is in the heating mode and the second refrigerant detector 21 detects refrigerant leakage in the indoor unit 2 for 30 consecutive seconds, the first solenoid valve 14 is automatically closed and the second solenoid valve 15 is opened. If the low-pressure protection action is further detected, the unit shuts down the compressor 11 and simultaneously closes the second solenoid valve 15 to ensure that the refrigerant in the indoor unit 2 completely returns to the outdoor unit 1. At the same time, the third solenoid valve 33 and the fourth solenoid valve 35 are opened, the reserved gas in the refrigerant storage 3 is discharged, and the refrigerant enters the storage chamber 31 due to the pressure difference, and the refrigerant is completely recovered by the rising of the slider. After the recovery is completed, for the third solenoid valve 33, the user can discharge the refrigerant to an appropriate position through the manual valve 34. When the unit is in the heating mode and the first refrigerant detector 13 detects refrigerant leakage in the outdoor unit 1 for 30 consecutive seconds, the operation process is similar to that of the indoor unit 2 leakage, and the first solenoid valve 14 is automatically opened and the second solenoid valve 15 is closed. If the low-pressure protection is further detected, the unit shuts down the compressor 11 and simultaneously closes the first solenoid valve 14 to ensure the safe recovery of the refrigerant in the outdoor unit 1. When the unit is in the cooling mode and the second refrigerant detector 21 detects refrigerant leakage in the outdoor unit 1 for 30 consecutive seconds, the first solenoid valve 14 is controlled to close and the second solenoid valve 15 is opened. When the low-pressure protection action is detected, the compressor 11 is shut down and the second solenoid valve 15 is closed at the same time. At this time, the refrigerant in the indoor unit 2 completely returns to the outdoor unit 1. At the same time, the third solenoid valve 33 and the fourth solenoid valve 35 are opened, and the reserved gas in the storage chamber 31 of the refrigerant storage 3 is discharged into the air through the fifth channel 363. Since the pressure in the exhaust chamber 32 becomes smaller, the refrigerant will enter the originally vacuum storage chamber 31. The refrigerant pressure acts on the first spring 381 and the second spring 382, and the first spring 381 and the second spring 382 generate elastic forces to act on the slider 37 to rise, ensuring that all the refrigerant of the unit is recovered into the refrigerant storage. Subsequently, the third solenoid valve 33 is closed, and the refrigerant can be discharged to a predetermined position through the manual valve 34. When the unit is in the heating mode and the first refrigerant detector 13 detects refrigerant leakage for 30 consecutive seconds, the first solenoid valve 14 is controlled to open and the second solenoid valve 15 is closed. When the low-pressure protection action is detected, the compressor 11 is shut down and the first solenoid valve 14 is closed. At this time, the refrigerant in the indoor unit 2 completely returns to the outdoor unit 1. At the same time, the third solenoid valve 33 and the fourth solenoid valve 35 are opened, and the reserved gas in the storage chamber 31 of the refrigerant storage 3 is discharged into the air through the fifth channel 363. Since the pressure in the exhaust chamber 32 becomes smaller, the refrigerant will enter the originally vacuum storage chamber 31. The refrigerant pressure acts on the first spring 381 and the second spring 382, and the first spring 381 and the second spring 382 generate elastic forces to act on the slider 37 to rise, ensuring that all the refrigerant of the unit is recovered into the refrigerant storage. Subsequently, the third solenoid valve 33 is closed, and the refrigerant can be discharged to a predetermined position through the manual valve 34.

[0072] The above are only specific embodiments of the present application, enabling those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A split-type refrigerant leakage treatment system, characterized in that Comprising: An outdoor unit, the outdoor unit includes a compressor, a switching valve, a first refrigerant detector, a first solenoid valve and a second solenoid valve. The switching valve is connected to the compressor. The first solenoid valve is connected to the switching valve, and the second solenoid valve is connected to the compressor. The switching valve is used to switch the operating mode of the unit, and the first refrigerant detector is used to detect whether refrigerant leakage occurs in the outdoor unit. An indoor unit, the indoor unit and the outdoor unit are interconnected through a first channel and a second channel. The indoor unit includes a second refrigerant detector for detecting whether refrigerant leakage occurs in the indoor unit. The first solenoid valve is connected to the indoor unit through the first channel. The first solenoid valve is used to control the on / off of the first channel through the operating mode of the unit. The second solenoid valve is connected to the indoor unit through the second channel. The second solenoid valve is used to control the on / off of the second channel according to the operating mode of the unit. A refrigerant storage, the refrigerant storage is connected to the outdoor unit. The refrigerant storage is provided with a storage chamber, an exhaust chamber and an elastic component. The storage chamber is connected to the outdoor unit and is used to store the leaked refrigerant. The exhaust chamber is separated from the storage chamber by the elastic component and is used to adjust the pressure balance between the storage chamber and the exhaust chamber through the elastic component when refrigerant leakage occurs.

2. The split refrigerant leakage treatment system according to claim 1, wherein, The outdoor unit further includes a first heat exchanger, a regulating valve and a gas-liquid separator. The switching valve includes a first interface, a second interface, a third interface and a fourth interface arranged in sequence. The first interface, the regulating valve and the first solenoid valve are connected in sequence. The second interface is connected to the second solenoid valve. The third interface is connected to one end of the gas-liquid separator. The other end of the gas-liquid separator is connected to the compressor. The fourth interface is connected to the compressor and the refrigerant storage. The regulating valve is used to adjust the refrigerant flow rate in the outdoor unit, and the gas-liquid separator is used to perform gas-liquid separation on the refrigerant in the outdoor unit.

3. The split refrigerant leakage treatment system according to claim 1, characterized in that, The outdoor unit further includes a first stop valve and a second stop valve. The first stop valve is arranged in the first channel, and the second stop valve is arranged in the second channel. The first stop valve is used to throttle and reduce the pressure of the first channel, and the second stop valve is used to throttle and reduce the pressure of the second channel.

4. The split refrigerant leakage treatment system according to claim 2, wherein, The outdoor unit further includes a first heat exchanger. The first heat exchanger is arranged between the first interface of the switching valve and the regulating valve and is used to exchange heat of the refrigerant in the outdoor unit. The indoor unit further includes a second heat exchanger. The second heat exchanger is respectively connected to the first channel and the second channel and is used to exchange heat of the refrigerant in the indoor unit.

5. A split refrigerant leakage treatment system according to claim 1, wherein The refrigerant storage also includes a third solenoid valve, a manual valve, and a fourth solenoid valve. The third solenoid valve is respectively connected to the external unit and the storage cavity. The third solenoid valve is used to control the on-off of the third channel for transmitting the refrigerant to the storage cavity. The manual valve is connected to the storage cavity. The manual valve is used to control the on-off of the fourth channel for exhausting the refrigerant in the storage cavity. The fourth solenoid valve is connected to the exhaust cavity. The fourth solenoid valve is used to control the on-off of the fifth channel for exhausting the exhaust cavity.

6. The split refrigerant leakage treatment system according to claim 5, wherein When the unit operating mode is the refrigeration mode and the refrigerant leaks in the internal unit or the external unit, the first solenoid valve closes and the second solenoid valve opens to make the refrigerant in the internal unit enter the external unit. After the internal unit has a low-pressure protection action, the compressor and the second solenoid valve close synchronously to prevent the refrigerant entering the external unit from flowing back into the internal unit. The third solenoid valve and the fourth solenoid valve open synchronously to make the refrigerant in the external unit enter the storage cavity. After all the refrigerant in the external unit enters the storage cavity, the third solenoid valve and the fourth solenoid valve close.

7. A split refrigerant leakage treatment system according to claim 5, wherein When the unit operating mode is the heating mode and the refrigerant leaks in the internal unit or the external unit, the first solenoid valve opens and the second solenoid valve closes to make the refrigerant in the internal unit enter the external unit. After the internal unit has a low-pressure protection action, the compressor and the first solenoid valve close synchronously to prevent the refrigerant entering the external unit from flowing back into the internal unit. The third solenoid valve and the fourth solenoid valve open synchronously to make the refrigerant in the external unit enter the storage cavity. After all the refrigerant in the external unit enters the storage cavity, the third solenoid valve and the fourth solenoid valve close.

8. The split refrigerant leakage treatment system according to claim 2, wherein The first heat exchanger uses a finned heat exchanger, the second heat exchanger uses a plate heat exchanger, and the regulating valve uses an electronic expansion valve.

9. The split refrigerant leakage treatment system according to claim 1, wherein, The elastic component includes a slider and a spring assembly. The spring assembly includes at least one spring. The spring acts on the slider. The slider separates the storage cavity and the exhaust cavity.

10. A split refrigerant leakage treatment system according to claim 9, wherein, The spring is arranged in the storage cavity. One end of the spring is connected to the bottom of the storage cavity, and the other end of the spring is connected to the slider so that the slider slides back and forth in the extending direction of the storage cavity towards the exhaust cavity.

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