Air conditioner and control method thereof, controller, air conditioning system and storage medium

Abstract

The invention provides an air conditioner and a control method thereof, a controller, an air conditioning system and a storage medium. The air conditioner comprises a circulation loop used for achieving circulation flowing of a refrigerant so as to conduct refrigeration or heating, and a compressor, an outdoor heat exchanger and a gas-liquid separator are arranged on the circulation loop; the deicing flow path is connected with an outlet of the compressor and an inlet of the gas-liquid separator and is thermally coupled with the outdoor heat exchanger so as to deice the outdoor heat exchanger by using the high-temperature refrigerant flowing out of the compressor; and the bypass branch is connected with the deicing flow path and an inlet of the compressor so as to guide the refrigerant in the deicing flow path back to the compressor. Therefore, the working reliability of the air conditioner can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, and in particular to an air conditioner and a control method thereof, a controller, an air conditioning system and a storage medium. Background Art

[0002] In the actual use of air conditioning, users may add less refrigerant than the designed amount to the unit for reasons such as reducing costs. In addition, there may be problems such as leakage during the operation of the air conditioner, all of which may cause the unit to have less refrigerant and affect its working reliability. Summary of the invention

[0003] A technical problem to be solved by the present application is to improve the working reliability of the air conditioner.

[0004] In order to solve the above technical problems, the present application provides an air conditioner, which includes:

[0005] A circulation loop is used to realize the circulation flow of the refrigerant for cooling or heating, and the circulation loop is provided with a compressor, an outdoor heat exchanger and a gas-liquid separator;

[0006] a deicing flow path connecting the outlet of the compressor and the inlet of the gas-liquid separator and thermally coupled to the outdoor heat exchanger to de-ice the outdoor heat exchanger using the high-temperature refrigerant flowing out of the compressor; and

[0007] A bypass branch connects the deicing flow path and the inlet of the compressor to guide the refrigerant in the deicing flow path back to the compressor.

[0008] In some embodiments, a deicing valve is provided on the deicing flow path, which controls the on-and-off of the deicing flow path, and the connection position between the bypass branch and the deicing flow path is located upstream of the deicing valve along the direction in which the refrigerant flows through the deicing flow path; and / or, a deicing throttling device is provided on the deicing flow path, which throttles the refrigerant in the deicing flow path, and the connection position between the bypass branch and the deicing flow path is located downstream of the deicing valve along the direction in which the refrigerant flows through the deicing flow path.

[0009] In some embodiments, a deicing valve and a deicing throttling member are provided on the deicing flow path. The deicing throttling member and the deicing valve are arranged in sequence along the direction of the refrigerant flowing through the deicing flow path. The connection position between the bypass branch and the deicing flow path is located between the deicing valve and the deicing throttling member.

[0010] In some embodiments, the bypass branch is connected to the de-icing flow path between the outdoor heat exchanger and the gas-liquid separator.

[0011] In some embodiments, a bypass throttling device is provided on the bypass branch to throttle the refrigerant flowing back to the compressor through the bypass branch; and / or a bypass valve is provided on the bypass branch to control the on-off of the bypass branch.

[0012] In some embodiments, an oil separator is also provided on the circulation loop, and the oil separator is connected to the outlet of the compressor to separate the lubricating oil from the refrigerant flowing out of the compressor. A cold oil heat exchanger for cooling the lubricating oil is provided on the bypass branch. The cold oil heat exchanger connects the oil separator and the compressor through a cold oil flow path, so that the lubricating oil separated by the oil separator is cooled by the refrigerant in the bypass branch and then flows back to the compressor.

[0013] In some embodiments, the air conditioner is configured as at least one of the following:

[0014] The cold oil heat exchanger is located downstream of the bypass throttling element on the bypass branch along the direction in which the refrigerant flows through the bypass branch;

[0015] A cold oil valve is provided on the cold oil flow path, and the cold oil valve controls the on-off of the cold oil flow path;

[0016] The cold oil flow path is provided with a cold oil throttle, and the cold oil throttle throttles the lubricating oil flowing back to the compressor through the cold oil flow path.

[0017] In some embodiments, the cold oil valve is arranged upstream of the cold oil heat exchanger along the direction in which the lubricating oil flows through the cold oil flow path; and / or the cold oil throttling element is arranged downstream of the cold oil heat exchanger along the direction in which the lubricating oil flows through the cold oil flow path.

[0018] In addition, the present application also provides a method for controlling an air conditioner based on any one of the embodiments, comprising:

[0019] Determine whether the air conditioner is cooling or heating;

[0020] When the air conditioner is cooling or heating, the refrigerant in the deicing flow path is led back to the compressor through the bypass branch.

[0021] In some embodiments, when the air conditioner is cooling or heating, the opening of the bypass throttling member on the bypass branch is adjusted in the process of guiding the refrigerant in the deicing flow path back to the compressor using the bypass branch.

[0022] In some embodiments, when the air conditioner is cooling or heating, in the process of using the bypass branch to guide the refrigerant in the deicing flow path back to the compressor without passing through the gas-liquid separator, adjusting the opening of the bypass throttling member on the bypass branch includes at least one of the following:

[0023] When the air conditioner is in cooling mode, the opening of the bypass throttling element on the bypass branch is adjusted according to the exhaust temperature of the compressor;

[0024] When the air conditioner is heating, the opening of the bypass throttling element on the bypass branch is adjusted according to the low pressure value of the compressor.

[0025] In some embodiments, when the air conditioner is cooling, adjusting the opening of the bypass throttling element on the bypass branch according to the exhaust temperature of the compressor includes at least one of the following:

[0026] When T<a, the opening of the bypass throttling element is 0;

[0027] When a≤T<b, the opening of the bypass throttling element is A;

[0028] When b≤T<c, the opening of the bypass throttling element is B;

[0029] When T≥c, the opening of the bypass throttling element is C;

[0030] Wherein, T is the exhaust temperature of the compressor, a<b<c, 0<A<B<C.

[0031] In some embodiments, 85°C; and / or 90°C; and / or 95°C; and / or and / or, 300 steps; and / or, 350 steps.

[0032] In some embodiments, when the air conditioner is heating, adjusting the opening of the bypass throttling element on the bypass branch according to the low pressure value of the compressor includes at least one of the following:

[0033] When L<m, the opening of the bypass throttling device is D;

[0034] When m≤L<n, the opening of the bypass throttling element is E;

[0035] When n≤L<p, the opening of the bypass throttling element is F;

[0036] When L≥p, the opening of the bypass throttling element is set to 0;

[0037] Wherein, L is the saturation temperature of the refrigerant corresponding to the low pressure value of the compressor, m<n<p, D>E>F>0.

[0038] In some embodiments, and / or, and / or, and / or, and / or, and / or, .

[0039] In some embodiments, when the air conditioner is cooling, the deicing flow path and the gas-liquid separator are disconnected during the process of using a bypass branch to guide the refrigerant in the deicing flow path back to the compressor; and / or, when the air conditioner is heating, the deicing flow path and the gas-liquid separator are connected during the process of using a bypass branch to guide the refrigerant in the deicing flow path back to the compressor, so that the refrigerant is guided back to the compressor via the gas-liquid separator by the deicing flow path.

[0040] In some embodiments, when the air conditioner is cooling or heating, in the process of using a bypass branch to direct the refrigerant in the de-icing flow path back to the compressor, the oil heat exchanger located on the bypass branch is also connected to the compressor and the oil separator, so that the refrigerant in the bypass branch can cool the lubricating oil flowing back to the compressor from the oil separator.

[0041] In addition, the present application also provides a controller, which includes a memory and a processor coupled to the memory, and the processor is configured to execute the control method of any embodiment based on instructions stored in the memory.

[0042] In addition, the present application also provides an air conditioning system, which includes the air conditioner of any embodiment and the controller of any embodiment.

[0043] In addition, the present application also provides a storage medium, which stores computer instructions, and the computer instructions are executed by a processor to implement the control method of any embodiment.

[0044] By setting up a bypass branch to guide the refrigerant in the de-icing flow path back to the compressor, the refrigerant in the compressor can be quickly replenished. Therefore, the adverse effect of insufficient refrigerant on the working reliability of the whole machine can be effectively reduced, thereby effectively improving the working reliability of the air conditioner.

[0045] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 This is a schematic diagram of the working principle of an air conditioner in one embodiment of the present application.

[0048] Figure 2 This is a schematic diagram of the working principle of an air conditioner in another embodiment of the present application. Description of reference numerals:

[0049] 100. Air conditioning;

[0050] 1. Circulation loop; 11. Compressor; 12. Oil separator; 13. Four-way valve; 14. Outdoor heat exchanger; 15. Subcooler; 16. First valve; 17. Indoor heat exchanger; 18. Second valve; 19. Gas-liquid separator;

[0051] 2. Oil return flow path; 21. Oil return valve; 22. Oil return throttling element;

[0052] 3. Deicing flow path; 31. Filter; 32. Deicing throttling element; 33. Deicing valve; 34. Deicing heat exchange pipe;

[0053] 4. Bypass branch; 41. Bypass throttling element; 42. Cold oil heat exchanger;

[0054] 5. cold oil flow path; 51. first oil path; 52. second oil path; 53. cold oil throttling element; 54. cold oil valve;

[0055] 6. Capillary;

[0056] 7. Throttle valve. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without carrying out creative work are within the scope of protection of this application.

[0058] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0059] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0060] In the description of the present application, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present application.

[0061] In the present application, unless otherwise specified, “plurality” means at least two, that is, including cases of two and at least three.

[0062] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0063] It has been found in practice that if the amount of refrigerant in the air conditioner is too small, the unit will face many reliability problems and may even cause the unit to fail to work normally.

[0064] For example, during cooling, if the amount of refrigerant in the unit is too little, less refrigerant will return to the compressor, and the compressor motor cannot be effectively cooled, and the heat cannot be effectively dissipated. As a result, the compressor exhaust temperature will be too high, the compressor will run in a fatigue state for a long time, and it will be easy to be damaged, shortening its lifespan, affecting the reliability of the air conditioner.

[0065] For another example, when heating, if the amount of refrigerant in the unit is too little, the low pressure value of the compressor will be too low, the heating capacity will be less stable and decay faster, affecting the working reliability of the air conditioner.

[0066] It can be seen that whether in cooling mode or heating mode, insufficient amount of refrigerant will affect the working reliability of the air conditioner.

[0067] In view of the above situation, the present application provides an air conditioner.

[0068] Figure 1 and Figure 2 The air conditioner in the present application is exemplarily shown.

[0069] See also Figure 1 and Figure 2 In the present application, the air conditioner 100 includes a circulation loop 1 and a deicing flow path 3 .

[0070] The circulation loop 1 is used to realize the circulation of the refrigerant to perform cooling or heating. Figure 1 and Figure 2 As shown, a compressor 11 , an outdoor heat exchanger 14 and a gas-liquid separator 19 are provided on the circulation loop 1 .

[0071] The deicing flow path 3 is used to de-ice the outdoor heat exchanger 14 to prevent ice and frost from affecting the normal operation of the outdoor heat exchanger 14. Figure 1 and Figure 2As shown, the deicing flow path 3 connects the outlet of the compressor 11 and the inlet of the gas-liquid separator 19, and is thermally coupled with the outdoor heat exchanger 14, so as to utilize the high-temperature refrigerant flowing out of the compressor 11 to de-ice the outdoor heat exchanger 14. The deicing flow path 3 is thermally coupled with the outdoor heat exchanger 14, which means that the deicing flow path 3 and the outdoor heat exchanger 14 can exchange heat, and the refrigerant in the deicing flow path 3 de-ices the outdoor heat exchanger 14. As a way of thermally coupling the deicing flow path 3 with the outdoor heat exchanger 14, the deicing flow path 4 is thermally coupled with the outdoor heat exchanger 14 through the deicing heat exchange pipe 34 arranged at the bottom of the outdoor heat exchanger 14. During operation, part of the high-temperature refrigerant flowing out of the compressor 11 outlet flows into the deicing flow path 3, and flows through the deicing heat exchange pipe 34 at the bottom of the outdoor heat exchanger 14, releasing heat to de-ice the outdoor heat exchanger 14, and then flows through the gas-liquid separator 19 and returns to the compressor 11, so as to achieve the deicing effect by making the high-temperature refrigerant flow directly from the high-pressure side through the outdoor heat exchanger 14. The corresponding deicing flow path 3 usually works in the heating mode and does not work in the cooling mode.

[0072] In order to prevent the insufficient amount of refrigerant from affecting the working reliability of the air conditioner 100, refer to Figure 1 and Figure 2 In the present application, the air conditioner 100 includes not only the circulation loop 1 and the deicing flow path 3, but also a bypass branch 4. The bypass branch 4 connects the deicing flow path 3 and the inlet of the compressor 11 to guide the refrigerant in the deicing flow path 3 back to the compressor 11.

[0073] By adding a bypass branch 4 to the deicing flow path 3, the refrigerant in the deicing flow path 3 can be directly led back to the compressor 11. At least part of the refrigerant in the deicing flow path 3 can flow back to the compressor 11 without passing through the gas-liquid separator 19. In this way, the path and time for the corresponding refrigerant to flow back to the compressor 11 can be shortened, so that the corresponding refrigerant can flow back to the compressor 11 more quickly, and the amount of refrigerant in the compressor 11 can be increased more promptly, thereby effectively preventing the working reliability of the air conditioner 100 from being affected by the small amount of refrigerant.

[0074] For example, in the refrigeration mode, the bypass branch 4 is used to directly guide the refrigerant in the de-icing flow path 3 back to the compressor 11, so that the refrigerant can quickly return to the compressor 11, increase the amount of refrigerant in the compressor 11, enhance the cooling of the motor of the compressor 11, etc., and alleviate the problem of the compressor 11 running in a fatigue state for a long time due to insufficient refrigerant and insufficient cooling, and high exhaust temperature. The risk of damage to the compressor 11 is effectively reduced, and the life of the compressor 11 is extended. In this way, the working reliability of the air conditioner 100 can be effectively improved.

[0075] Moreover, in the refrigeration mode, the deicing flow path 3 is not working, and the refrigerant entering the deicing flow path 3 does not originally flow back to the compressor 11, but will accumulate in the deicing flow path 3, resulting in a waste of refrigerant. By leading out a bypass branch 4 from the deicing flow path 3 and using the bypass branch 4 to lead the refrigerant originally remaining in the deicing flow path 3 back to the compressor 11, the waste of refrigerant can be reduced, the utilization rate of the refrigerant can be improved, and it will not, or basically will not, affect the normal refrigeration process, and can achieve stable operation of the whole machine.

[0076] It can be seen that in the refrigeration state, the bypass branch 4 is used to guide the refrigerant in the de-icing flow path 3 back to the compressor 11. This can reduce the waste of refrigerant and improve the utilization rate of the refrigerant without affecting the normal refrigeration operation. It can also alleviate the problem of the compressor 11 running in a long-term fatigue state due to the small amount of refrigerant and the high exhaust temperature, thereby effectively improving the working reliability of the air conditioner 100.

[0077] For another example, in the heating mode, the refrigerant in the deicing flow path 3 flows back to the compressor 11 via the gas-liquid separator 19, and while the outdoor heat exchanger 14 is deiced and defrosted, a portion of the refrigerant in the deicing flow path 3 is directly led back to the compressor 11 by using the bypass branch 4 without passing through the gas-liquid separator 19, so that the corresponding refrigerant returns to the compressor 11 at a place closer to the air intake of the compressor 11. This not only allows this portion of the refrigerant to quickly return to the compressor 11 and increase the amount of refrigerant in the compressor 11 in time, but also reduces the refrigerant loss caused by deposition at the bottom of the gas-liquid separator 19 and reduces the pressure loss of the refrigerant due to flowing through the gas-liquid separator 19. Therefore, it is beneficial to improve the low pressure value of the compressor 11 and effectively solve the problem of poor heating capacity stability and rapid heating capacity decay rate due to low low pressure value. In this way, the working reliability of the air conditioner 100 can be effectively improved.

[0078] The refrigerant in the deicing flow path 3 returns to the compressor 11 only after the gas-liquid separation in the gas-liquid separator 19. The low-pressure increase of the compressor 11 during heating is not obvious because, when returning to the compressor 11 through the gas-liquid separator 19, part of the liquid refrigerant will be separated and stored at the bottom of the gas-liquid separator 19, causing refrigerant loss, resulting in a small amount of refrigerant returning to the compressor 11. Moreover, the gas-liquid separator 19 is a cavity with a large volume. When the refrigerant passes through the gas-liquid separator 19, there will be a relatively large pressure loss. In particular, during heating, the refrigerant stored in the gas-liquid separator 19 is directly returned from the outdoor heat exchanger 14, and the temperature of the entire gas-liquid separator 19 is relatively low, while the temperature of the refrigerant in the deicing flow path 3 is relatively high. When entering the gas-liquid separator 19, the pressure loss is relatively large.

[0079] By utilizing the bypass branch 4 to guide a portion of the refrigerant in the deicing flow path 3 back to the compressor 11 at a location closer to the inlet of the compressor 11, the problems of refrigerant quantity and pressure loss caused by all the refrigerant in the deicing flow path 3 returning to the compressor 11 via the gas-liquid separator 19 can be effectively alleviated, the low pressure value of the compressor 11 can be effectively increased, the stability of the heating capacity of the air conditioner 100 can be improved, the attenuation of the heating capacity can be delayed, and the working reliability of the air conditioner 100 can be effectively improved.

[0080] Moreover, during heating, the deicing flow path 3 can still work according to normal logic without being affected by the bypass branch 4. Therefore, using the bypass branch 4 to guide a portion of the refrigerant in the deicing flow path 3 back to the compressor 11 at a location closer to the inlet of the compressor 11 does not affect the normal heating and deicing process, and can achieve stable operation of the entire machine.

[0081] It can be seen that in the heating mode, the bypass branch 4 is used to guide the refrigerant in the deicing flow path 3 back to the compressor 11, which can effectively increase the low pressure value of the compressor 11 without affecting the normal heating and deicing process, delay the attenuation of the heating capacity, and improve the working reliability of the air conditioner 100.

[0082] From the above analysis, it can be seen that, whether in cooling mode or heating mode, using the bypass branch 4 to guide the refrigerant in the deicing flow path 3 back to the compressor 11 can effectively reduce the adverse effect of the small amount of refrigerant on the working reliability of the unit, thereby effectively improving the working reliability of the air conditioner 100.

[0083] The connection position of the bypass branch 4 on the deicing flow path 3 can be varied.

[0084] For example, the connection position of the bypass branch 4 on the deicing flow path 3 may be located on the flow path of the deicing flow path 3 between the outdoor heat exchanger 14 and the outlet of the compressor 11, or on the flow path of the deicing flow path 3 between the outdoor heat exchanger 14 and the gas-liquid separator 19. Figure 1 and Figure 2When the connection position of the bypass branch 4 on the deicing flow path 3 is located on the flow path of the deicing flow path 3 between the outdoor heat exchanger 14 and the gas-liquid separator 19, the bypass branch 4 is connected to the portion of the deicing flow path 3 between the outdoor heat exchanger 14 and the gas-liquid separator 19, and the connection position of the bypass branch 4 on the deicing flow path 3 is located downstream of the deicing heat exchange pipe 34 along the direction in which the refrigerant flows through the deicing flow path 3. In this way, it is convenient for the bypass branch 4 to lead the refrigerant deposited in the deicing heat exchange pipe 34 back to the compressor 1 in the cooling mode. 1. Since the deicing flow path 3 does not work in the cooling mode, the refrigerant in the deicing flow path 3 is mainly deposited in the deicing heat exchange pipe 34. Therefore, the bypass branch 4 is connected to the flow path of the deicing flow path 3 located between the outdoor heat exchanger 14 and the gas-liquid separator 19, and the refrigerant deposited in the deicing heat exchange pipe 34 is led back to the compressor 11 in the cooling mode, so as to facilitate the introduction of more refrigerant back to the compressor 11, more effectively increase the amount of refrigerant in the compressor 11, increase the exhaust temperature of the compressor 11, and improve the working reliability of the air conditioner 100.

[0085] For another example, see Figure 1 and Figure 2 In some embodiments, a deicing valve 33 is provided on the deicing flow path 3, and the deicing valve 33 is used to control the on-off of the deicing flow path 3. Along the direction of the refrigerant flowing through the deicing flow path 3, the connection position between the bypass branch 4 and the deicing flow path 3 is located upstream of the deicing valve 33. At this time, the deicing valve 33 only controls the on-off of the deicing flow path 3, but does not control the on-off of the bypass branch 4. The operation of the bypass branch 4 is not affected by whether the deicing flow path 3 is working. Therefore, in the cooling mode, the deicing flow path 3 can be made inoperative by simply closing the deicing valve 3, but the operation of the bypass branch 4 is not affected. The bypass branch 4 can still lead the refrigerant in the deicing flow path 3 and lead it back to the compressor 11. Therefore, it can effectively meet the different requirements of the deicing flow path 3 not working and the bypass branch 4 working in the cooling mode, realize the effective improvement of the compressor exhaust temperature in the cooling mode, and effectively improve the working reliability of the air conditioner 100.

[0086] For example, see Figure 1 and Figure 2 In some embodiments, a deicing throttling device 32 is provided on the deicing flow path 3, and the deicing throttling device 32 throttles the refrigerant in the deicing flow path 3. Along the direction in which the refrigerant flows through the deicing flow path 3, the connection position between the bypass branch 4 and the deicing flow path 3 is located downstream of the deicing throttling device 32. In this way, the refrigerant drawn out from the deicing flow path 3 by the bypass branch 4 can pass through the throttling of the deicing throttling device 32 to reduce the temperature and pressure, which can better meet the refrigerant return requirement of the compressor 11, and therefore, is more conducive to improving the working reliability of the air conditioner 100.

[0087] For example, see Figure 1 and Figure 2In some embodiments, a deicing valve 33 and a deicing throttle 32 are provided on the deicing flow path 3, and the deicing throttle 32 and the deicing valve 33 are arranged in sequence along the direction in which the refrigerant flows through the deicing flow path 3, and the connection position between the bypass branch 4 and the deicing flow path 3 is located between the deicing valve 33 and the deicing throttle 32. In this way, the refrigerant introduced to the compressor 11 by the bypass branch 4 is the refrigerant throttled by the deicing throttle 32, which is more in line with the refrigerant return requirement of the compressor 11, and in the cooling mode, the deicing valve 33 can be closed to make the deicing flow path 3 not work and the bypass branch 4 work, so that the exhaust temperature of the compressor 11 is increased without affecting the normal operation of the refrigeration, thereby effectively improving the working reliability of the air conditioner 100.

[0088] As a further improvement to the above embodiments, see Figure 2 The bypass branch 4 is provided with a bypass throttling member 41 to throttle the refrigerant flowing back to the compressor 11 via the bypass branch 4. In this way, the bypass throttling member 41 can be used to throttle the refrigerant flowing into the bypass branch 4, so that the refrigerant flowing back to the compressor 11 via the bypass branch 4 is a low-temperature and low-pressure gaseous refrigerant, which better meets the refrigerant return requirement of the compressor 11, more effectively improves the working reliability of the compressor 11, and further improves the working reliability of the air conditioner 100. In particular, when the connection position between the bypass branch 4 and the deicing flow path 3 is located downstream of the deicing throttling element 32 along the direction of the refrigerant flowing through the deicing flow path 3, a bypass throttling element 41 is further provided on the bypass branch 4. The deicing throttling element 32 and the bypass throttling element 41 can together perform two throttling operations on the refrigerant flowing back to the compressor 11 via the bypass branch 4, thereby more reliably making the refrigerant flowing back to the compressor 11 a low-temperature and low-pressure gaseous refrigerant, thereby better meeting the refrigerant return requirements of the compressor 11, and more effectively improving the working reliability of the air conditioner 100.

[0089] The bypass throttling element 41 may be a throttling orifice plate, a capillary tube 6 or a throttle valve 7 or other structural forms capable of realizing a throttling function. When the bypass throttling element 41 includes the throttle valve 7, the accuracy is higher and the controllability is stronger, which is conducive to realizing a more accurate regulation of the refrigerant flowing back to the compressor 11 through the bypass branch 4, more effectively alleviating the problem of low reliability caused by a small amount of refrigerant, and more effectively improving the working reliability of the air conditioner 100.

[0090] In addition, in some embodiments, a bypass valve (not shown) is provided on the bypass branch 4 to control the on and off of the bypass branch 4. In this way, it is convenient to control whether the bypass branch 4 works by controlling the opening and closing of the bypass valve, so that the bypass branch 4 is controlled to open and work only when needed.

[0091] Continue to see Figure 2As a further improvement to the aforementioned embodiments, a cold oil heat exchanger 42 for cooling the lubricating oil is provided on the bypass branch 4. The cold oil heat exchanger 42 is connected to the compressor 11 and the oil separator 12 (connected to the outlet of the compressor 11 to separate the lubricating oil in the refrigerant flowing out of the compressor 11) through the cold oil flow path 5, so that the lubricating oil separated by the oil separator 12 is cooled by the refrigerant in the bypass branch 4 and then flows back to the compressor 11. In this way, on the one hand, the temperature of the lubricating oil flowing back to the compressor 11 is lower, which can achieve a better lubricating oil cooling effect and more effectively prevent the lubricating oil from overheating; on the other hand, the lubricating oil separated by the oil separator 12 inevitably contains some gaseous refrigerant. Cooling the lubricating oil is beneficial to shrink the gaseous refrigerant, reduce the specific volume, increase the amount of oil returning to the compressor 11 per unit time, and effectively enhance the oil return effect; on the other hand, after the refrigerant in the bypass branch 4 cools the lubricating oil, the temperature can be increased to a certain extent. The corresponding temperature increase is beneficial to increase the low pressure value of the compressor 11 in the heating mode and improve the stability of the heating capacity. These are all beneficial to further improve the working reliability of the air conditioner 100.

[0092] It can be seen that further disposing a cold oil heat exchanger 42 on the bypass branch 4 to achieve cooling of the lubricating oil convectively returned to the compressor 11 by the refrigerant in the bypass branch 4 can further improve the working reliability of the air conditioner 100.

[0093] The location of the cold oil heat exchanger 42 on the bypass branch 4 can be varied. Figure 2 When a bypass throttling device 41 is provided on the bypass branch 4 , the cold oil heat exchanger 42 can be located upstream or downstream of the bypass throttling device 41 on the bypass branch 4 along the direction in which the refrigerant flows through the bypass branch 4 . Among them, when the cold oil heat exchanger 42 is located downstream of the bypass throttling device 41 along the direction of the refrigerant flowing through the bypass branch 4, it is more conducive to improving the working reliability of the air conditioner 100. Because, on the one hand, the refrigerant in the bypass branch 4 flows into the cold oil heat exchanger 42 only after passing through the bypass throttling device 41. The refrigerant flowing into the cold oil heat exchanger 42 has passed the throttling effect of the bypass throttling device 41 and has a lower temperature, which is conducive to more fully absorbing the heat of the lubricating oil and achieving a better cooling effect on the lubricating oil; on the other hand, after cooling the lubricating oil, the refrigerant flowing out of the cold oil heat exchanger 42 does not need to pass through the throttling and cooling effect of the bypass throttling device 41, and can directly flow back to the compressor 11. In this way, the temperature of the refrigerant flowing back to the compressor 11 from the bypass branch 4 is relatively high, which is conducive to improving the low pressure value of the compressor 11 in the heating mode. All of these are conducive to further improving the working reliability of the air conditioner 100. It can be understood that although the temperature of the refrigerant increases to a certain extent after cooling the lubricating oil, the refrigerant is still a low-temperature and low-pressure gaseous refrigerant, and therefore can still meet the refrigerant reflux requirements of the compressor 11.

[0094] In the case where a cold oil heat exchanger 42 is provided on the bypass branch 4, see Figure 2 In some embodiments, a cold oil valve 54 and / or a cold oil throttling member 53 is provided on the cold oil flow path 5 that connects the cold oil heat exchanger 42 with the compressor 11 and the oil separator 12.

[0095] The cold oil valve 54 controls the on-off of the cold oil flow path 5. In this way, it is convenient to control whether to start the cold oil flow path 5 and whether to use the cold oil heat exchanger 42 to cool the lubricating oil by the refrigerant in the bypass branch 4, thereby improving the flexibility of the unit operation. The cold oil valve 54 can be set in various positions on the cold oil flow path 5. For example, it can be set upstream or downstream of the cold oil heat exchanger 42 along the direction in which the lubricating oil flows through the cold oil flow path 5. When the cold oil valve 54 is set upstream of the cold oil heat exchanger 42 along the direction in which the lubricating oil flows through the cold oil flow path 5, closing the cold oil valve 54 can prevent the lubricating oil from entering the cold oil heat exchanger 42, which is conducive to more reliably controlling the cold oil heat exchanger 42 to stop cooling the lubricating oil.

[0096] The cold oil throttle 53 throttles the lubricating oil flowing back to the compressor 11 via the cold oil flow path 5. In this way, the cold oil throttle 53 can achieve two-stage cooling of the lubricating oil together with the cold oil heat exchanger 42, thereby further improving the cooling effect of the lubricating oil and further improving the working reliability of the air conditioner 100. The cold oil throttle 53 can be arranged in various positions on the cold oil flow path 5, for example, it can be arranged upstream or downstream of the cold oil heat exchanger 42 along the direction in which the lubricating oil flows through the cold oil flow path 5. When the cold oil throttling member 53 is arranged downstream of the cold oil heat exchanger 42 along the direction in which the lubricating oil flows through the cold oil flow path 5, when the lubricating oil flows through the cold oil heat exchanger 42, the temperature is relatively high before it passes through the throttling effect of the cold oil throttling member 53, and can better exchange heat with the refrigerant in the bypass branch 4, so as to give full play to the role of the cold oil heat exchanger 42 and achieve a better heat exchange effect at the cold oil heat exchanger 42. While effectively cooling the lubricating oil, the temperature of the refrigerant flowing back to the compressor 11 through the bypass branch 4 is further increased, thereby improving the stability of the heating capacity. Moreover, the lubricating oil flowing out of the cold oil heat exchanger 42 can pass through the further throttling effect of the cold oil throttling member 53, and the temperature is further reduced, so that the temperature of the lubricating oil returning to the compressor 11 is lower, thereby more effectively preventing the lubricating oil from overheating, thereby further improving the working reliability of the air conditioner 100.

[0097] The cold oil throttling element 53 can be a throttling orifice plate, a capillary tube 6 or a throttle valve 7 or other structures capable of achieving a throttling function. Since the lubricating oil has relatively low precision requirements for the throttling process, when the cold oil throttling element 53 includes a capillary tube 6, the throttling requirements of the lubricating oil can be met, and it is beneficial to reduce costs and simplify the control process.

[0098] The air conditioner 100 in the above-mentioned embodiments can be various types of air conditioners. For example, in some embodiments, the air conditioner 100 is a multi-split air conditioner. During operation, a multi-split air conditioner is more likely to have a problem of insufficient refrigerant. Therefore, when the air conditioner 100 is a multi-split air conditioner, the bypass branch 4 has a more significant effect and can more effectively improve the working reliability.

[0099] Based on the air conditioner 100 of the aforementioned embodiments, the present application further provides a control method, which includes:

[0100] Determine whether the air conditioner 100 is cooling or heating;

[0101] When the air conditioner 100 is cooling or heating, the refrigerant in the deicing flow path 3 is led back to the compressor 11 by the bypass branch 4 .

[0102] Based on the above steps, in the cooling or heating mode, at least part of the refrigerant in the de-icing flow path 3 can be introduced back to the compressor 11 from a position closer to the inlet of the compressor 11 by the bypass branch 4, so as to achieve rapid replenishment of the refrigerant in the compressor, and effectively alleviate the problem of insufficient refrigerant amount during cooling or heating. Therefore, the working reliability of the air conditioner 100 can be effectively improved.

[0103] Furthermore, in some embodiments, when the air conditioner 100 is cooling or heating, the opening of the bypass throttle 41 on the bypass branch 4 is adjusted in the process of guiding the refrigerant in the deicing flow path 3 back to the compressor 11 without passing through the gas-liquid separator 19 by using the bypass branch 4. In this way, it is convenient to adjust the throttling effect of the bypass throttle 41 on the refrigerant in the bypass branch 4 in real time according to actual conditions, so that the amount of refrigerant flowing back to the compressor 11 through the bypass branch 4 is more consistent with the actual demand, thereby more effectively improving the working reliability of the air conditioner 100.

[0104] For example, in some embodiments, when the air conditioner 100 is cooling, the opening of the bypass throttle 41 on the bypass branch 4 is adjusted according to the exhaust temperature of the compressor 11. In this way, in the cooling mode, the amount of refrigerant returning to the compressor 11 through the bypass branch 4 can be adjusted according to the actual size of the compressor exhaust temperature, which is more consistent with the actual demand for the amount of refrigerant in the cooling mode, thereby more effectively adjusting the exhaust temperature and more reliably improving the working reliability of the air conditioner 100.

[0105] Specifically, in some embodiments, when the air conditioner 100 is cooling, adjusting the opening of the bypass throttle 41 on the bypass branch 4 according to the exhaust temperature of the compressor 11 includes at least one of the following:

[0106] When T<a, the opening of the bypass throttle 41 is set to 0;

[0107] When a≤T<b, the opening of the bypass throttle 41 is A;

[0108] When b≤T<c, the opening of the bypass throttle 41 is set to B;

[0109] When T≥c, the opening of the bypass throttling member 41 is set to C;

[0110] Wherein, T is the exhaust temperature of the compressor 11, a<b<c, 0<A<B<C.

[0111] In the above steps, the opening of the bypass throttling element 41 increases with the increase of the exhaust temperature of the compressor 11. In this way, the higher the exhaust temperature of the compressor 11, the more refrigerant flows back to the compressor 11 through the bypass branch 4, which can effectively increase the refrigerant amount of the compressor 11, reduce the exhaust temperature of the compressor 11, and prevent the compressor 11 from running in a fatigue state for a long time. Therefore, it is more conducive to improving the working reliability of the air conditioner 100.

[0112] In the above steps, the values ​​of a, b, c, A, B and C can be varied. As an example, in some embodiments, 85°C; and / or 90°C; and / or 95°C; and / or and / or, 300 steps; and / or, Step 350. In this way, in the cooling mode, the adjustment gradient of the opening of the bypass throttling member 41 is more reasonable, which is more conducive to improving the working reliability of the air conditioner 100.

[0113] In addition, in some embodiments, when the air conditioner 100 is heating, the opening of the bypass throttle 41 on the bypass branch 4 is adjusted according to the low pressure value of the compressor 11. In this way, in the heating mode, the amount of refrigerant returning to the compressor 11 through the bypass branch 4 can be adjusted according to the actual size of the low pressure value of the compressor, which is more consistent with the actual demand for the amount of refrigerant in the heating mode, thereby more effectively adjusting the low pressure value of the compressor 11 and more reliably improving the working reliability of the air conditioner 100.

[0114] Specifically, in some embodiments, when the air conditioner 100 is heating, adjusting the opening of the bypass throttle 41 on the bypass branch 4 according to the low pressure value of the compressor 11 includes at least one of the following:

[0115] When L<m, the opening of the bypass throttle 41 is set to D;

[0116] When m≤L<n, the opening of the bypass throttling member 41 is set to E;

[0117] When n≤L<p, the opening of the bypass throttling member 41 is set to F;

[0118] When L≥p, the opening of the bypass throttle 41 is set to 0;

[0119] Among them, m<n<p, D>E>F>0, L is the saturation temperature of the refrigerant corresponding to the low pressure value of the compressor 11. It can be understood that L is proportional to the low pressure value of the compressor 11, and the higher L is, the higher the low pressure value of the compressor 11 is.

[0120] In the above steps, the opening of the bypass throttling element 41 decreases as the low pressure value of the compressor 11 increases. In this way, the lower the low pressure value of the compressor 11, the more refrigerant flows back to the compressor 11 through the bypass branch 4, which can effectively increase the amount of refrigerant in the compressor 11, increase the low pressure value of the compressor 11, and prevent the heating capacity from rapidly decaying. Therefore, it is more conducive to improving the working reliability of the air conditioner 100.

[0121] In the above steps, the values ​​of m, n, p, D, E and F can be varied. As an example, in some embodiments, and / or, and / or, and / or, and / or, and / or, In this way, in the heating mode, the adjustment gradient of the opening of the bypass throttling member 41 is more reasonable, which is more conducive to improving the working reliability of the air conditioner 100.

[0122] In the above embodiments, when the air conditioner 100 is cooling, the deicing flow path 3 can be disconnected from the gas-liquid separator 19 in the process of using the bypass branch 4 to lead the refrigerant in the deicing flow path 3 back to the compressor 11. In this way, when cooling, the bypass branch 4 works and the deicing flow path 3 does not work, so that the exhaust temperature of the compressor 11 can be reduced without affecting the normal cooling process, thereby improving the working reliability of the air conditioner 100.

[0123] In addition, when the air conditioner 100 is heating, the deicing flow path 3 and the gas-liquid separator 19 can be connected to each other in the process of using the bypass branch 4 to lead the refrigerant in the deicing flow path 3 back to the compressor 11, so that the deicing flow path 3 can lead the refrigerant back to the compressor 11 via the gas-liquid separator 19. In this way, when heating, the bypass branch 4 works and the deicing flow path 3 also works, which can effectively de-ice the outdoor heat exchanger 14 while increasing the low pressure value of the compressor 11 and improving the working reliability of the air conditioner 100.

[0124] In addition, when the bypass branch 4 is provided with a cold oil heat exchanger 42, when the air conditioner 100 is cooling or heating, in the process of using the bypass branch 4 to lead the refrigerant in the deicing flow path 3 back to the compressor 11, the cold oil heat exchanger 42 located on the bypass branch 4 can be connected with the compressor 11 and the oil separator 12, so that the refrigerant in the bypass branch 4 can cool the lubricating oil flowing back from the oil separator 12 to the compressor 11. In this way, the temperature of the lubricating oil flowing back to the compressor 11 can be reduced, the oil return effect can be enhanced, and it is beneficial to increase the low pressure value of the compressor 11 in the heating mode, so that the working reliability of the air conditioner 100 can be effectively improved.

[0125] The control methods of the aforementioned embodiments may be performed under the control of a controller, wherein the controller includes a memory and a processor coupled to the memory, and the processor is configured to execute the control method of any embodiment based on instructions stored in the memory.

[0126] In addition, the present application also provides an air conditioning system, which includes the air conditioner 100 of any embodiment and the controller of any embodiment.

[0127] In addition, the present application also provides a storage medium, and the corresponding storage medium stores computer instructions, and the computer instructions are executed by a processor to implement the control method of any embodiment.

[0128] Next, combine Figure 1 and Figure 2 The present application is further introduced with reference to the embodiments.

[0129] First, let’s introduce Figure 1 The embodiment shown.

[0130] like Figure 1 As shown, in this embodiment, the air conditioner 100 is a multi-split air conditioner, and includes a circulation loop 1, an oil return flow path 2, a deicing flow path 3 and a bypass branch 4.

[0131] The circulation loop 1 is used to realize the circulation of the refrigerant to realize the cooling or heating function of the air conditioner 100. Figure 1As shown, in this embodiment, the circulation loop 1 is provided with a compressor 11, an oil separator 12 (referred to as oil separator), a four-way valve 13, an outdoor heat exchanger 14, a first valve 16, an indoor heat exchanger 17, a second valve 18 and a gas-liquid separator 19 (referred to as gas separator) connected in sequence. The compressor 11 is used to compress the refrigerant to compress the low-temperature and low-pressure refrigerant into a high-temperature and high-pressure gaseous refrigerant. The four-way valve 13 is arranged between the outlet of the compressor 11 and the indoor heat exchanger 17 and the outdoor heat exchanger 14 to control the flow direction of the refrigerant, thereby realizing the switching of different modes such as cooling and heating. The oil separator 12 is arranged between the outlet of the compressor 11 and the four-way valve 13, and is used to separate the oil and gas of the high-temperature refrigerant flowing out of the compressor 11, and separate the lubricating oil in the refrigerant. The oil separator 12 is connected to the compressor 11 through the oil return flow path 2, so that the lubricating oil separated by the oil separator 12 can be returned to the compressor 11 through the oil return flow path 2, so that the oil amount in the compressor 11 is sufficient. The outdoor heat exchanger 14 is used to achieve heat exchange between outdoor air and refrigerant, and acts as a condenser during cooling and an evaporator during heating. The indoor heat exchanger 17 is used to achieve heat exchange between indoor air and refrigerant, and acts as an evaporator during cooling and a condenser during heating. The gas-liquid separator 19 is used to separate the refrigerant flowing back into the compressor 11 from gas and liquid to prevent a large amount of liquid refrigerant from returning to the compressor 11, causing liquid hammer in the compressor and damaging the compressor 11.

[0132] During cooling, the flow direction of the refrigerant is: compressor 11 - oil separator 12 - four-way valve 13 - outdoor heat exchanger 14 - first valve 16 - indoor heat exchanger 17 - second valve 18 - four-way valve 13 - gas-liquid separator 19 - back to compressor 11.

[0133] During heating, the flow direction of the refrigerant is: compressor 11 - oil separator 12 - four-way valve 13 - second valve 18 - indoor heat exchanger 17 - first valve 16 - outdoor heat exchanger 14 - four-way valve 13 - gas-liquid separator 19 - back to compressor 11.

[0134] The oil return flow path 2 connects the oil separator 12 and the compressor 11, and is used to guide the lubricating oil separated by the oil separator 12 back to the compressor 11, so that the oil amount in the compressor 11 is sufficient. Figure 1 As shown, in this embodiment, an oil return valve 21 is provided on the oil return flow path 2, and the oil return valve 21 is used to control the on-off of the oil return flow path 2, so as to control whether the lubricating oil separated by the oil separator 12 is led back to the compressor 11 via the oil return flow path 2. In addition, an oil return throttle 22 is also provided on the oil return flow path 2. The oil return throttle 22 is located upstream of the oil return valve 21 along the direction in which the lubricating oil flows through the oil return flow path 2, and is used to throttle the lubricating oil flowing back to the compressor 11 via the oil return flow path 2, so as to reduce the temperature of the lubricating oil flowing back to the compressor 11 and prevent the lubricating oil from overheating.

[0135] The deicing flow path 3 connects the outlet of the compressor 11 and the inlet of the gas-liquid separator 19, and passes through the deicing heat exchange pipe 34 at the bottom of the outdoor heat exchanger 14, so as to de-ice the outdoor heat exchanger 14 by allowing the high-temperature refrigerant to flow directly through the outdoor heat exchanger 14 from the high-pressure side to release heat to the outdoor heat exchanger 14, thereby preventing ice and frost from affecting the normal operation of the outdoor heat exchanger 14.

[0136] like Figure 1 As shown, in this embodiment, one end of the deicing flow path 3 is connected to the portion of the circulation loop 1 located between the compressor 11 outlet and the four-way valve 13 to achieve connection with the compressor 11 outlet, and the other end is connected to the portion of the circulation loop 1 located between the four-way valve 13 and the gas-liquid separator 19 to achieve connection with the inlet of the gas-liquid separator 19.

[0137] And, if Figure 1 As shown, in this embodiment, a filter 31, a deicing throttle 32 and a deicing valve 33 are provided on the deicing flow path 3. The filter 31, the deicing throttle 32 and the deicing valve 33 are all arranged on the flow path of the deicing flow path 3 between the outdoor heat exchanger 14 and the gas-liquid separator 19, and are arranged in sequence along the flow direction of the refrigerant, and are respectively used for filtering, throttling and on-off control. In this way, when the deicing valve 33 is opened, the refrigerant flowing from the compressor 11 into the deicing flow path 3 can flow through the filter 31, the deicing throttle 32 and the deicing valve 33 in sequence after deicing the outdoor heat exchanger 14, and then flow into the gas-liquid separator 19, and finally return to the compressor 11. When flowing through the filter 31, the refrigerant is filtered to avoid blocking the deicing throttle 32 and the deicing valve 33 downstream. When flowing through the deicing throttle 32, the refrigerant is throttled. In this embodiment, the deicing throttling element 32 includes a capillary tube 6 to meet the throttling requirement of the refrigerant in the deicing flow path 3 based on a relatively simple structure.

[0138] In this embodiment, the deicing flow path 3 does not work in the cooling mode, but only works in the heating mode. Accordingly, the deicing valve 33 is closed in the cooling mode and opened in the heating mode. In the cooling mode, the refrigerant flowing from the compressor 11 into the deicing flow path 3 is mainly deposited in the deicing heat exchange pipe 34.

[0139] The bypass branch 4 is led out from the deicing flow path 3 and connected to the inlet of the compressor 11, so that the refrigerant in the deicing flow path 3 can flow back to the compressor 11 without passing through the gas-liquid separator 19, so as to realize the rapid replenishment of the refrigerant in the compressor 11, so as to solve the problem of excessively high exhaust temperature of the compressor 11 during cooling and low low pressure value during heating caused by insufficient amount of refrigerant, thereby effectively improving the working reliability of the air conditioner 100.

[0140] like Figure 1As shown, in this embodiment, one end of the bypass branch 4 is connected to the portion of the deicing flow path 3 located between the deicing throttling member 32 and the deicing valve 33, and the other end is connected to the inlet of the compressor 11 to connect the deicing flow path 3 and the inlet of the compressor 11, so that the refrigerant can be drawn out from the deicing flow path 3 and the corresponding refrigerant can flow back to the compressor 11.

[0141] Since the bypass branch 4 is connected to the portion of the deicing flow path 3 between the deicing throttling device 32 and the deicing valve 33, the connection position between the bypass branch 4 and the deicing flow path 3 is located downstream of the deicing throttling device 32 and upstream of the deicing valve 33. In this way, the bypass branch 4 can lead the refrigerant after throttling by the deicing throttling device 32 back to the compressor 11, and the opening and closing of the deicing valve 33 only controls the on-off of the deicing flow path 3, but does not control the on-off of the bypass branch 4. In this way, it can not only meet the requirement that both the deicing flow path 3 and the bypass branch 4 work in the heating mode, but also meet the requirement that only the bypass branch 4 works and the deicing flow path 3 does not work in the cooling mode.

[0142] Bypass branch 4 works in both cooling and heating modes. Figure 1 As shown by the solid arrow in the middle, the bypass branch 4 leads out the refrigerant in the deicing flow path 3 after being throttled by the deicing throttling device 32, so that the corresponding refrigerant quickly flows back to the compressor 11, thereby realizing the rapid replenishment of the refrigerant in the compressor 11, effectively increasing the amount of refrigerant in the compressor 11, and alleviating the phenomenon that the exhaust temperature of the compressor 11 is too high during cooling and the low pressure value is too low during heating due to the small amount of refrigerant, thereby effectively improving the working reliability of the air conditioner 100.

[0143] It can be seen that this embodiment adds a bypass branch 4 after the deicing throttling device 32 of the deicing flow path 3, so that the refrigerant quickly returns to the compressor 11 without passing through the gas-liquid separator 19. This can not only alleviate the problem of excessively high exhaust temperature caused by insufficient refrigerant during cooling, but also alleviate the problem of excessively low pressure caused by insufficient refrigerant during heating. Therefore, the working reliability of the air conditioner 100 can be effectively improved.

[0144] Next, let’s introduce Figure 2 The embodiment shown.

[0145] Depend on Figure 2 It can be seen that this embodiment is different from the aforementioned Figure 1 The main difference between the illustrated embodiments is that, in this embodiment, a subcooler 15 is provided on the circulation loop 1, and a bypass throttling device 41 and a cold oil heat exchanger 42 arranged in sequence along the refrigerant flow direction are provided on the bypass branch 4. At the same time, a cold oil flow path 5 is provided in the air conditioner 100.

[0146] The subcooler 15 is disposed between the outdoor heat exchanger 14 and the first valve 16 and is used to recool the liquid refrigerant to reduce throttling losses and improve the refrigeration coefficient.

[0147] The bypass throttling element 41 includes a throttling valve 7, specifically, an expansion valve, such as an electronic expansion valve. In this way, the refrigerant passing through the bypass branch 4 can be throttled, and the flow rate, pressure and temperature of the refrigerant flowing back to the compressor 11 through the bypass branch 4 can be more accurately adjusted by adjusting the opening of the bypass throttling element 41, so that the flow rate, pressure and temperature of the refrigerant flowing back to the compressor 11 through the bypass branch 4 are more consistent with actual needs, and the exhaust temperature of the compressor 11 during cooling and the low pressure value during heating can be more accurately adjusted, thereby more effectively improving the working reliability of the air conditioner 100.

[0148] The cold oil heat exchanger 42 is arranged downstream of the bypass throttling member 41 along the refrigerant flow direction, and is connected to the return oil flow path 2 and the compressor 11 through the cold oil flow path 5 to achieve heat exchange between the refrigerant in the bypass branch 4 and the lubricating oil separated by the oil separator 12. The refrigerant in the bypass branch 4 cools the lubricating oil to prevent the lubricating oil from overheating, and the lubricating oil increases the temperature of the refrigerant flowing back to the compressor 11 through the bypass branch 4, thereby improving the stability of the heating capacity. In this embodiment, the cold oil heat exchanger 42 is a tubular heat exchanger, in which the refrigerant flows in the tube side and the lubricating oil flows in the shell side.

[0149] The cold oil flow path 5 realizes the connection between the cold oil heat exchanger 42 and the return oil flow path 2 and the compressor 11, so that the lubricating oil flows back to the compressor 11 via the cold oil heat exchanger 42. Figure 2 As shown, in this embodiment, the cold oil flow path 5 includes a first oil circuit 51 and a second oil circuit 52. The first oil circuit 51 connects the return oil flow path 2 and the cold oil heat exchanger 42, and the second oil circuit 52 connects the cold oil heat exchanger 42 and the compressor 11, so as to realize the connection between the cold oil heat exchanger 42 and the return oil flow path 2 and the compressor 11.

[0150] And, if Figure 2 As shown, in this embodiment, a cold oil valve 54 is provided on the first oil circuit 51, and a cold oil throttling member 53 is provided on the second oil circuit 52. In this way, the cold oil valve 54 and the cold oil throttling member 53 are respectively located upstream and downstream of the cold oil heat exchanger 42 along the flow direction of the lubricating oil to perform on-off control and throttling. Specifically, in this embodiment, the cold oil throttling member 53 includes a capillary tube 6 to throttle the lubricating oil based on a relatively simple structure.

[0151] The bypass branch 4 and the cold oil flow path 5 of this embodiment work in both cooling and heating modes. Figure 2As shown by the solid arrow, the bypass branch 4 leads the refrigerant in the deicing flow path 3 after being throttled by the deicing throttling element 32, so that the corresponding refrigerant passes through the throttling effect of the bypass throttling element 41 again, flows through the cold oil heat exchanger 42, and flows back to the compressor 11, so as to quickly replenish the refrigerant in the compressor 11, effectively increase the amount of refrigerant in the compressor 11, alleviate the phenomenon that the exhaust temperature of the compressor 11 is too high when cooling and the low pressure value is too low when heating due to insufficient refrigerant, and effectively improve the working reliability of the air conditioner 100. In addition, as shown in FIG. Figure 2 As shown by the middle dotted arrow, when the cold oil valve 54 is opened, the lubricating oil separated by the oil separator 12 flows into the cold oil heat exchanger 42, exchanges heat with the refrigerant flowing through the cold oil heat exchanger 42, and after being cooled, flows through the cold oil throttling element 53, and after being throttled, returns to the compressor 11, so that the oil amount in the compressor 11 is sufficient.

[0152] The bypass throttle 41 is used as a throttling component of the bypass branch 4 to throttle the refrigerant after throttling through the deicing throttle 32 again to ensure that the refrigerant returning to the compressor 11 is a low-temperature and low-pressure refrigerant. During operation, the opening of the bypass throttle 41 is adjusted according to the exhaust temperature and low pressure value of the compressor 11, so that under different compressor exhaust temperatures and low pressure conditions, the amount of refrigerant flowing back to the compressor 11 through the bypass branch 4 is different, and the compressor 11 is supplemented with refrigerant that is more in line with actual needs, so that the working reliability of the air conditioner 100 can be more effectively improved.

[0153] Specifically, in this embodiment, during cooling, the de-icing valve 33 is closed, and the opening of the bypass throttle 41 is adjusted as follows:

[0154] When T<a, the bypass throttle 41 is closed and the opening is 0;

[0155] When a≤T<b, the opening of the bypass throttle 41 is A;

[0156] When b≤T<c, the opening of the bypass throttle 41 is B;

[0157] When T≥c, the opening of the bypass throttling member 41 is set to C;

[0158] Wherein, T is the exhaust temperature of the compressor 11, a<b<c, 0<A<B<C, for example, a is 81, 82, 83 or 84°C, b is 86, 87, 88 or 89°C, c is 91, 92, 93 or 94°C, A is 210, 220, 230 or 240 steps, B is 260, 270, 280 or 290 steps, and C is 310, 320, 330 or 340 steps.

[0159] By adopting the above method, the opening of the bypass throttling device 41 can be reasonably gradient-adjusted during cooling, so that during cooling, the higher the exhaust temperature of the compressor 11, the larger the opening of the bypass throttling device 41. Therefore, when the exhaust temperature of the compressor 11 is higher, the bypass branch 4 can be used to introduce more refrigerant back to the compressor 11 more quickly, increase the amount of refrigerant in the compressor 11 more quickly, and cool it more quickly, thereby reducing the exhaust temperature more quickly, effectively preventing the exhaust temperature from being too high and affecting the working reliability of the air conditioner 100.

[0160] During heating, the de-icing valve 33 is opened and controlled according to normal logic, and the opening of the bypass throttle 41 is controlled according to the low pressure value of the compressor 11, and the two do not affect each other. The opening of the bypass throttle 41 is adjusted as follows:

[0161] When L<m, the opening of the bypass throttle 41 is set to D;

[0162] When m≤L<n, the opening of the bypass throttling member 41 is set to E;

[0163] When n≤L<p, the opening of the bypass throttling member 41 is set to F;

[0164] When L≥p, the opening of the bypass throttle 41 is set to 0;

[0165] Among them, L is the saturation temperature of the refrigerant corresponding to the low pressure value of the compressor 11, m<n<p, D>E>F>0, for example, m is -15, -14 or -13℃, n is -9, -10 or -11℃, p is -7, -6 or -5℃, D is 470, 460, 450, 440, 430, 420 or 410 steps, E is 310, 320, 330, 340, 350, 360, 370, 380 or 390 steps, and F is 210, 220, 230, 240, 250, 260, 270, 280 or 290 steps.

[0166] By adopting the above method, the opening of the bypass throttling device 41 can be reasonably gradient-adjusted during heating, so that when heating, the lower the low pressure value of the compressor 11, the larger the opening of the bypass throttling device 41 is. Therefore, when the low pressure value of the compressor 11 is lower, more refrigerant can be introduced back to the compressor 11 more quickly by utilizing the bypass branch 4, thereby increasing the amount of refrigerant in the compressor 11 more quickly and raising the low pressure value more quickly, thereby effectively preventing the low pressure value from being too low and affecting the working reliability of the air conditioner 100.

[0167] It can be seen that this embodiment further provides a bypass throttling device 41 and a cold oil heat exchanger 42 on the bypass branch 4, thereby further throttling the refrigerant flowing back to the compressor 11 via the bypass branch 4, and utilizing the refrigerant flowing back to the compressor 11 via the bypass branch 4 to cool the lubricating oil separated by the oil separator 12, thereby further improving the working reliability of the air conditioner 100.

[0168] The above description is only an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An air conditioner (100), characterized in that: include: A circulation loop (1) for realizing a circulating flow of a refrigerant to perform cooling or heating, wherein the circulation loop (10) is provided with a compressor (11), an outdoor heat exchanger (14) and a gas-liquid separator (19); A deicing flow path (3) connected to the outlet of the compressor (11) and the inlet of the gas-liquid separator (19), and thermally coupled to the outdoor heat exchanger (14) so ​​as to utilize the high-temperature refrigerant flowing out of the compressor (11) to de-ice the outdoor heat exchanger (14); and A bypass branch (4) connects the deicing flow path (3) and the inlet of the compressor (11) so as to guide the refrigerant in the deicing flow path (3) back to the compressor (11).

2. The air conditioner (100) according to claim 1, characterized in that: The deicing flow path (3) is provided with a deicing valve (33), and the deicing valve (33) controls the on-off of the deicing flow path (3). Along the direction of the refrigerant flowing through the deicing flow path (3), the connection position between the bypass branch (4) and the deicing flow path (3) is located upstream of the deicing valve (33); and / or, the deicing flow path (3) is provided with a deicing throttling component (32), and the deicing throttling component (33) throttles the refrigerant in the deicing flow path (3). Along the direction of the refrigerant flowing through the deicing flow path (3), the connection position between the bypass branch (4) and the deicing flow path (3) is located downstream of the deicing valve (33).

3. The air conditioner (100) according to claim 2, characterized in that: The deicing flow path (3) is provided with the deicing valve (33) and the deicing throttling component (32); the deicing throttling component (32) and the deicing valve (33) are arranged in sequence along the direction in which the refrigerant flows through the deicing flow path (3); and the connection position between the bypass branch (4) and the deicing flow path (3) is located between the deicing valve (33) and the deicing throttling component (32).

4. The air conditioner (100) according to claim 1, characterized in that: The bypass branch (4) is connected to the flow path of the deicing flow path (3) between the outdoor heat exchanger (14) and the gas-liquid separator (19).

5. The air conditioner (100) according to claim 1, characterized in that: The bypass branch (4) is provided with a bypass throttling element (41) to throttle the refrigerant flowing back to the compressor (11) via the bypass branch (4); and / or the bypass branch (4) is provided with a bypass valve to control the on / off of the bypass branch (4).

6. The air conditioner (100) according to any one of claims 1 to 5, characterized in that: The circulation loop (1) is also provided with an oil separator (12), and the oil separator (12) is connected to the outlet of the compressor (11) to separate the lubricating oil in the refrigerant flowing out of the compressor (11). The bypass branch (4) is provided with a cold oil heat exchanger (42) for cooling the lubricating oil. The cold oil heat exchanger (42) is connected to the oil separator (12) and the compressor (11) through a cold oil flow path (5), so that the lubricating oil separated by the oil separator (12) is cooled by the refrigerant in the bypass branch (4) and then flows back to the compressor (11).

7. The air conditioner (100) according to claim 6, characterized in that: The air conditioner (100) is configured as at least one of the following: The cold oil heat exchanger (42) is located downstream of the bypass throttling element (41) on the bypass branch (4) along the direction in which the refrigerant flows through the bypass branch (4); The cold oil flow path (5) is provided with a cold oil valve (54), and the cold oil valve (54) controls the on-off of the cold oil flow path (5); The cold oil flow path (5) is provided with a cold oil throttling member (53), and the cold oil throttling member (53) throttles the lubricating oil flowing back to the compressor (11) via the cold oil flow path (5).

8. The air conditioner (100) according to claim 7, characterized in that: The cold oil valve (54) is arranged upstream of the cold oil heat exchanger (5) along the direction in which the lubricating oil flows through the cold oil flow path (5); and / or the cold oil throttling element (53) is arranged downstream of the cold oil heat exchanger (5) along the direction in which the lubricating oil flows through the cold oil flow path (5).

9. A method for controlling an air conditioner (100) according to any one of claims 1 to 8, characterized in that: include: Determining whether the air conditioner (100) is cooling or heating; When the air conditioner (100) is cooling or heating, the bypass branch (4) is used to guide the refrigerant in the deicing flow path (3) back to the compressor (11).

10. The control method according to claim 9, characterized in that: When the air conditioner (100) is cooling or heating, the opening of the bypass throttling element (41) on the bypass branch (4) is adjusted in the process of guiding the refrigerant in the deicing flow path (3) back to the compressor (11) using the bypass branch (4).

11. The control method according to claim 10, characterized in that: When the air conditioner (100) is cooling or heating, in the process of using the bypass branch (4) to guide the refrigerant in the deicing flow path (3) back to the compressor (11) without passing through the gas-liquid separator (19), adjusting the opening of the bypass throttling element (41) on the bypass branch (4) includes at least one of the following: When the air conditioner (100) is cooling, the opening of the bypass throttling element (41) on the bypass branch (4) is adjusted according to the exhaust temperature of the compressor (11); When the air conditioner (100) is heating, the opening of the bypass throttling element (41) on the bypass branch (4) is adjusted according to the low pressure value of the compressor (11).

12. The control method according to claim 11, characterized in that: When the air conditioner (100) is cooling, adjusting the opening of the bypass throttling element (41) on the bypass branch (4) according to the exhaust temperature of the compressor (11) includes at least one of the following: When T<a, the opening of the bypass throttling element (41) is set to 0; When a≤T<b, the opening degree of the bypass throttling element (41) is A; When b≤T<c, the opening degree of the bypass throttling element (41) is set to B; When T≥c, the opening degree of the bypass throttling element (41) is set to C; Wherein, T is the exhaust temperature of the compressor (11), a<b<c, 0<A<B<C.

13. The control method according to claim 12, characterized in that: 85°C; and / or 90°C; and / or 95°C; and / or and / or, 300 steps; and / or, 350 steps.

14. The control method according to claim 11, characterized in that: When the air conditioner (100) is heating, adjusting the opening of the bypass throttling element (41) on the bypass branch (4) according to the low pressure value of the compressor (11) includes at least one of the following: When L<m, the opening degree of the bypass throttling element (41) is set to D; When m≤L<n, the opening degree of the bypass throttling element (41) is set to E; When n≤L<p, the opening degree of the bypass throttling element (41) is F; When L≥p, the opening of the bypass throttling element (41) is set to 0; Wherein, L is the saturation temperature of the refrigerant corresponding to the low pressure value of the compressor (11), m<n<p, D>E>F>0.

15. The control method according to claim 14, characterized in that: and / or, and / or, and / or, and / or, and / or, .

16. The control method according to claim 9, characterized in that: When the air conditioner (100) is cooling, the deicing flow path (3) is disconnected from the gas-liquid separator (19) during the process of using the bypass branch (4) to guide the refrigerant in the deicing flow path (3) back to the compressor (11); and / or, when the air conditioner (100) is heating, the deicing flow path (3) is connected to the gas-liquid separator (19) during the process of using the bypass branch (4) to guide the refrigerant in the deicing flow path (3) back to the compressor (11), so that the deicing flow path (3) guides the refrigerant back to the compressor (11) via the gas-liquid separator (19).

17. The control method according to claim 9, characterized in that: When the air conditioner (100) is cooling or heating, the refrigerant in the deicing flow path (3) is introduced back to the compressor (11) by using the bypass branch (4), and the cold oil heat exchanger (42) located on the bypass branch (4) is also connected to the compressor (11) and the oil separator (12), so that the refrigerant in the bypass branch (4) cools the lubricating oil flowing back to the compressor (11) from the oil separator (12).

18. A controller, characterized in that: The invention comprises a memory and a processor coupled to the memory, wherein the processor is configured to execute the control method according to any one of claims 11 to 17 based on instructions stored in the memory.

19. An air conditioning system, characterized in that: It comprises the air conditioner (100) as claimed in any one of claims 1 to 10, and the controller as claimed in claim 18.

20. A storage medium storing computer instructions, wherein the computer instructions are executed by a processor according to any one of claims 11 to 17.

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