Air conditioning system and control method and control device thereof

Abstract

The invention provides an air conditioning system and a control method and device thereof. The air conditioning system comprises a compressor and an air return pipeline, the air return pipeline is provided with an air return port and an oil supplementing port, the air return port is communicated to the air return pipeline, and the oil supplementing port is communicated with an oil pool in the compressor; the oil storage and supplement device comprises an oil inlet pipeline, an oil storage container and an oil outlet pipeline, an inlet and an outlet of the oil inlet pipeline are communicated with the air return pipeline and the oil storage container respectively, and an inlet and an outlet of the oil outlet pipeline are communicated with the oil storage container and the oil supplement port respectively; an oil inlet valve is arranged on the oil inlet pipeline, and an oil outlet pump is arranged on the oil outlet pipeline. By introducing the oil storage and supplement device and the control logic thereof, the operation efficiency and reliability of the air conditioning system under the low-temperature condition are remarkably improved, and meanwhile the user experience is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and particularly to an air conditioning system, a control method thereof, and a control device thereof. Background Art

[0002] In the related art, air conditioning systems are becoming more and more popular, especially large multi-connected air conditioning system units. Since the pipelines of multi-connected units are relatively long, there is generally a separate oil circuit and related control of oil. However, during the ultra-low temperature heating startup stage, defrosting, or after the heating oil return is completed, the phenomenon of oil shortage and wear in the oil sump often occurs. This is mainly because a large amount of oil in the oil sump is pumped away during the ultra-low temperature heating startup stage, defrosting, or after the heating oil return is completed, and new and more oil cannot be replenished. The phenomenon of oil shortage in the compressor of the air conditioning system unit will cause damage to the moving parts of the compressor. For the air conditioning system unit, oil shortage in the oil sump is likely to occur during the ultra-low temperature heating startup process and after defrosting, which is likely to cause wear of the oil sump.

[0003] The existing methods for preventing oil shortage in the compressor oil sump during low-temperature static startup and during the compressor frequency increase stage after defrosting generally limit the compressor frequency increase speed. By increasing the frequency slowly, the movement amount of the oil sump is reduced, thereby reducing the wear amount of the oil sump.

[0004] However, relying solely on the above methods in the related art has limited effects. Because when the compressor reaches medium and high frequencies, it is still very easy to cause wear due to oil shortage in the oil sump, and limiting the compressor frequency increase speed causes the compressor to be unable to increase the frequency for a long time, resulting in poor performance of the air conditioning system and poor user experience comfort. Summary of the Invention

[0005] The present invention provides an air conditioning system, a control method thereof, and a control device thereof to solve the defects existing in the prior art and achieve the following technical effects: By introducing an oil storage and replenishment device and its control logic, the operation efficiency and reliability of the air conditioning system under low-temperature conditions are significantly improved, and the user experience is also enhanced.

[0006] The air conditioning system according to the first aspect embodiment of the present invention includes: A compressor and a suction pipe. The compressor has a suction port and an oil replenishment port. The suction port is connected to the suction pipe, and the oil replenishment port is connected to the oil sump inside the compressor; An oil storage and replenishment device, including an oil inlet pipe, an oil storage container, and an oil outlet pipe. The inlet and outlet of the oil inlet pipe are respectively connected to the suction pipe and the oil storage container, and the inlet and outlet of the oil outlet pipe are respectively connected to the oil storage container and the oil replenishment port; An oil inlet valve is provided on the oil inlet pipe, and an oil outlet pump is provided on the oil outlet pipe.

[0007] According to an embodiment of the present invention, a pressure balance pipe is further connected between the return gas pipeline and the oil storage container. The return gas pipeline has a horizontal section and a vertical section. The horizontal section is arranged downstream of the vertical section along the oil flow direction. A bending part is formed between the horizontal section and the vertical section. The inlet of the oil inlet pipeline is communicated with the horizontal section of the return gas pipeline and is arranged adjacent to the bending part, and the distance between the inlet of the oil inlet pipeline and the bending part is limited within a set distance.

[0008] According to an embodiment of the present invention, a first oil baffle is formed on the side of the inlet of the oil inlet pipeline away from the bending part. The first oil baffle at least partially covers the cross-section of the horizontal section perpendicular to the central axis direction, and a first gas passing gap is left between the first oil baffle and the upper inner wall of the horizontal section.

[0009] According to an embodiment of the present invention, two symmetrically arranged second oil baffles are formed on both sides of the outlet of the pressure balance pipe. The second oil baffles at least partially cover the cross-section of the horizontal section perpendicular to the central axis direction, and a second gas passing gap is left between the second oil baffles and the upper inner wall of the horizontal section.

[0010] According to an embodiment of the present invention, it further includes a temperature sensor and a heater. The temperature sensor is used to detect the temperature of the oil storage container, and the heater is used to heat the oil storage container. Preferably, the outer periphery of the oil storage container is wrapped with a heat insulation layer; and / or, a plurality of oil passing grid baffles are arranged inside the oil storage container, and an oil passing gap is defined between every two adjacent oil passing grid baffles.

[0011] According to an embodiment of the present invention, the inlet of the pressure balance pipe is located at the top of the oil storage container, and its outlet is connected to the return gas pipeline, and / or, the pressure balance pipe further includes a capillary section.

[0012] According to an embodiment of the second aspect of the present invention, a control method for the air conditioning system based on the embodiment of the first aspect of the present invention includes: Obtain the working mode, outdoor ambient temperature and working parameters of the air conditioning system; Under a specific working mode, control and adjust the working state of the oil inlet valve and / or the oil outlet pump according to at least one of the outdoor ambient temperature and the working parameters.

[0013] According to an embodiment of the present invention, the step of controlling and adjusting the working state of the oil inlet valve and / or the oil outlet pump according to at least one of the outdoor ambient temperature and the working parameters under a specific working mode specifically includes: In the heating mode, if it is determined that the frequency of the compressor is greater than the first set frequency and lasts for at least the first set duration, then control the oil inlet valve to open; If it is determined that the air conditioning system is in the heating mode and the frequency of the compressor is less than or equal to the first set frequency, or if it is determined that the air conditioning system is in the defrosting mode or the oil return mode, control the oil inlet valve to remain closed.

[0014] According to an embodiment of the present invention, the step of controlling and adjusting the working state of the oil inlet valve and / or the oil outlet pump according to at least one of the outdoor ambient temperature and the working parameters in a specific working mode specifically includes: In the heating mode, if it is determined that the cumulative opening duration of the oil inlet valve is greater than or equal to the second set duration, and the outdoor ambient temperature and the working parameters meet the oil outlet pump opening condition, then control the oil outlet pump to open; Wherein, the oil outlet pump opening condition includes any one of the following conditions: The outdoor ambient temperature is in the first temperature range, the static time of the compressor exceeds the third set duration and the frequency of the compressor after startup reaches the second set frequency; The outdoor ambient temperature is in the second temperature range, the static time of the compressor exceeds the fourth set duration and the frequency of the compressor after startup reaches the third set frequency; After the defrosting mode or the oil return mode is completed, the compressor frequency increases to the third set frequency; The outdoor ambient temperature is in the third temperature range, the static time of the compressor exceeds the fifth set duration and the frequency of the compressor after startup reaches the fourth set frequency; Wherein, the first temperature range is greater than the second temperature range, and the second temperature range is greater than the third temperature range; and the third set duration is greater than the fourth set duration, the fourth set duration is greater than the fifth set duration; and the second set frequency is less than the third set frequency, the third set frequency is less than the fourth set frequency.

[0015] According to an embodiment of the present invention, the step of controlling and adjusting the working state of the oil inlet valve and / or the oil outlet pump according to at least one of the outdoor ambient temperature and the working parameters in a specific working mode specifically includes: In the heating mode, if the outdoor ambient temperature and the working parameters meet the oil outlet pump closing condition, then control the oil outlet pump to close; Wherein, the oil outlet pump closing condition includes any one of the following conditions: After the defrosting mode or the oil return mode of the air conditioning system is completed and the compressor frequency increases to the target operating frequency, at this time, control the oil outlet pump to close after a delay of the sixth set duration; The outdoor ambient temperature is within the first temperature range, the static time of the compressor exceeds the third set duration, and the frequency of the compressor after startup reaches the fifth set frequency; The outdoor ambient temperature is within the second temperature range, the static time of the compressor exceeds the fourth set duration, and the frequency of the compressor after startup reaches the sixth set frequency; The outdoor ambient temperature is within the third temperature range, the static time of the compressor exceeds the fifth set duration, and the frequency of the compressor after startup reaches the seventh set frequency; Wherein, the fourth set frequency is less than the fifth set frequency, the fifth set frequency is less than the sixth set frequency, and the sixth set frequency is less than the seventh set frequency.

[0016] According to the control device of the air conditioning system described in the first aspect of the present invention according to the third aspect of the present invention, it includes: An acquisition module for acquiring the working mode, outdoor ambient temperature, and working parameters of the air conditioning system; A control module for controlling and adjusting the working state of the oil inlet valve and / or the oil outlet pump according to at least one of the outdoor ambient temperature and the working parameters in a specific working mode.

[0017] The present invention provides an air conditioning system. The air conditioning system is provided with an oil storage and replenishment device, which stores excess refrigerant oil during normal operation and releases this oil when needed to ensure the reliable operation of the compressor and compensate for the loss of the oil sump, thereby solving the problem of oil shortage in the oil sump during ultra-low temperature heating startup or after defrosting.

[0018] Furthermore, the air conditioning system of the present invention has at least the following advantages compared with the related art.

[0019] (1) Solved the problem of oil shortage in the oil sump: By increasing the amount of oil in the return air pipe, more lubricating oil is directly provided to the oil sump, which reduces the wear caused by oil shortage in the oil sump during low-temperature startup or after defrosting.

[0020] (2) Improved the reliability of the compressor: During the ultra-low temperature heating startup stage and after defrosting, by replenishing lubricating oil in a timely manner, the service life of the compressor is extended.

[0021] (3) Improved the user experience: By avoiding frequent wear of the compressor under low-temperature conditions, the number of repairs is reduced, and at the same time, the efficient operation of the air conditioning system is ensured, improving the user's comfort.

[0022] (4) Optimized the oil circuit management: The present invention not only solves the problem of oil shortage in the oil sump, but also makes the oil circuit more efficient and safe through a reasonable oil circuit design, including components such as the oil inlet valve and the oil pump.

[0023] (5) Intelligent control: The oil storage and replenishment device in the present invention has an automated control logic, which can automatically adjust the oil storage and replenishment according to the operating state of the compressor and the external ambient temperature, reducing the need for manual intervention.

[0024] In summary, by introducing the oil storage and replenishment device and its control logic, the present invention significantly improves the operating efficiency and reliability of the air-conditioning system under low-temperature conditions, and also enhances the user experience. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a schematic structural diagram of the air-conditioning system provided in Embodiment 1 of the present invention.

[0027] Figure 2 It is a schematic structural diagram of the connection relationship between the bent portion and the oil inlet pipeline of the air-conditioning system provided by the present invention.

[0028] Figure 3 It is a schematic structural diagram of the air-conditioning system provided in Embodiment 2 of the present invention.

[0029] Figure 4 It is a schematic structural diagram of the air-conditioning system provided in Embodiment 3 of the present invention.

[0030] Figure 5 It is a schematic diagram of the steps of the control method of the air-conditioning system provided by the present invention.

[0031] Figure 6 It is a schematic structural diagram of the control device of the air-conditioning system provided by the present invention.

[0032] Figure 7 It is a schematic structural diagram of the electronic device provided by the present invention.

[0033] Marking description: 1. Compressor; 11. Suction port; 12. Discharge port; 13. Oil replenishment port; 2. Oil sump; 3. Suction pipe; 31. Horizontal section; 32. Vertical section; 33. Bending part; 4. Oil inlet pipe; 41. Oil inlet valve; 42. First oil baffle; 43. First gas passing gap; 5. Oil storage container; 51. Oil passing grid baffle; 6. Oil outlet pipe; 61. Oil pump; 62. Second oil baffle; 63. Second gas passing gap; 7. Temperature sensor; 8. Filter; 91. Four-way valve; 92. Gas-liquid separator; 93. Outdoor heat exchanger; 94. Indoor heat exchanger; 95. Pressure balance pipe. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention fall within the scope of protection of the present invention.

[0035] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, without conflict, those skilled in the art may combine the different embodiments or examples described in this specification and the features of the different embodiments or examples.

[0036] A kind of air-conditioning system, its control method and control device will be described below with reference to the accompanying drawings.

[0037] As Figures 1 to 4 shown, the air-conditioning system according to the first aspect embodiment of the present invention includes a compressor 1 and an oil storage and replenishment device.

[0038] The compressor 1 has a suction port 11, a discharge port 12 and an oil replenishment port 13. The suction port 11 is connected to the suction pipe 3, and the oil replenishment port 13 is connected to the oil sump 2 inside the compressor 1.

[0039] The oil storage and replenishment device includes an oil inlet pipeline 4, an oil storage container 5, and an oil outlet pipeline 6 that are connected in sequence. The inlet and outlet of the oil inlet pipeline 4 are respectively connected to the return air pipeline 3 and the oil storage container 5, and the inlet and outlet of the oil outlet pipeline 4 are respectively connected to the oil storage container 5 and the oil replenishment port 13; an oil inlet valve 41 is provided on the oil inlet pipeline 4, and an oil outlet pump 61 is provided on the oil outlet pipeline 6. A pressure balance pipe 95 is also connected between the return air pipeline 3 and the oil storage container 5.

[0040] For the air conditioning system provided by the present invention, the main purpose of setting the oil storage and replenishment device in the air conditioning system is to solve the problem of oil shortage in the oil sump 2 when the compressor 1 starts heating at ultra-low temperature or after defrosting. By storing excess refrigerant oil during normal operation and releasing this oil when needed, the reliable operation of the compressor 1 is ensured and the loss of the oil sump 2 is replenished.

[0041] Further, the specific structure of the oil storage and replenishment device is introduced as follows: The oil inlet pipeline 4 can be located at the horizontal low position after the bent pipe section of the return air pipeline 3. The centrifugal action at the bent end of the pipeline is used to separate oil and gas. When the oil inlet valve 41 on the oil inlet pipeline 4 is opened, the oil can flow into the oil storage container 5 under the oil blocking action of the oil blocking plate.

[0042] The oil storage container 5 can include an oil storage container 5, a heating device, a heat insulation layer, a temperature sensor 7, etc. There are multiple oil passing grid baffles 51 inside the oil storage container 5 to reduce the fluctuation of the oil. There are a heating device and a heat insulation layer around to keep the oil temperature. A temperature sensor 7 is installed inside to monitor the oil temperature. The oil outlet pipeline 6 is connected to the suction port of the compressor 1 to replenish refrigerant oil to the oil sump 2. An oil outlet pump 61 is provided in the middle of the oil outlet pipeline 6 to push the oil to flow.

[0043] It can be understood that the working principle of the oil storage and replenishment device is as follows: During normal operation, the oil inlet valve 41 is opened, and at this time, the excess refrigerant oil is collected and stored in the oil storage container 5; after low-temperature startup or defrosting, the oil outlet pump 61 is opened, and the oil in the oil storage container 5 is pumped back to the compressor 1 to replenish the amount of oil required by the oil sump 2.

[0044] Specifically, the working process of the air conditioning system of the present invention generally includes an oil storage stage and an oil replenishment stage. Among them, for the oil storage stage: When the compressor 1 operates at normal full frequency or high frequency, the oil inlet valve 41 is opened. At this time, the excess refrigerant oil enters the oil storage container 5 through the oil inlet pipeline 4, and during this stage, the heating device can be turned on to heat the oil in the oil storage container 5. For the oil replenishment stage: After low-temperature startup or defrosting, when the compressor 1 needs more oil, the oil outlet pump 61 is opened. At this time, the oil in the oil storage container 5 is pumped back to the oil sump 2 of the compressor 1 through the oil outlet pipeline 6 and the oil outlet pump 61.

[0045] For example, in the specific control logic, in the refrigeration mode, the oil inlet valve 41 and the oil outlet pump 61 both stop working because additional oil supply is generally not required in the refrigeration mode.

[0046] In the heating mode, the oil inlet valve 41 will be automatically opened or closed according to the operating state of the compressor 1 to control the oil to enter the oil storage container 5. The oil outlet pump 61 will be automatically opened or closed according to the operating state of the compressor 1 and the external ambient temperature to control the oil supply. In addition, the heating device will also be automatically opened or closed according to the oil temperature and the operating state of the compressor 1 to maintain an appropriate oil temperature.

[0047] The above design can effectively solve the problem of oil shortage of the compressor 1 under specific working conditions, reduce the wear of the oil sump 2, and improve the reliability of the compressor 1 and the overall efficiency of the air-conditioning system.

[0048] In the related art, air-conditioning systems are becoming more and more popular, especially large multi-connected air-conditioning system units. Because the pipelines of multi-connected units are relatively long, there is generally a separate oil circuit and related control of oil. However, during the ultra-low temperature heating startup stage, defrosting, or after the heating oil return is completed, the phenomenon of oil shortage and wear in the oil sump often occurs. The main reason is that a large amount of oil in the oil sump is pumped away during the ultra-low temperature heating startup stage, defrosting, or after the heating oil return is completed, and new and more oil cannot be replenished. The phenomenon of oil shortage in the compressor of the air-conditioning system unit will cause damage to the moving parts of the compressor. For the air-conditioning system unit, oil shortage in the oil sump is likely to occur during the ultra-low temperature heating startup process and after defrosting is completed, which is likely to lead to wear of the oil sump.

[0049] The existing methods for preventing oil shortage in the compressor oil sump during low-temperature stationary startup and the compressor frequency increase stage after defrosting generally limit the compressor frequency increase speed. By slowly increasing the frequency, the movement amount of the oil sump is reduced, thereby reducing the wear amount of the oil sump.

[0050] However, the above methods in the related art have limited effects. Because when the compressor reaches medium and high frequencies, it is still very easy to cause wear due to oil shortage in the oil sump, and limiting the compressor frequency increase speed causes the compressor to be unable to increase the frequency for a long time, resulting in poor performance of the air-conditioning system and poor user experience comfort.

[0051] Therefore, to solve the above technical defects in the related art, the present invention provides an air-conditioning system. The air-conditioning system is provided with an oil storage and replenishment device, which stores excess refrigerant oil during normal operation and releases this oil when needed to ensure the reliable operation of the compressor 1 and replenish the loss of the oil sump 2, thereby solving the problem of oil shortage in the oil sump 2 after ultra-low temperature heating startup or defrosting of the compressor 1.

[0052] Furthermore, the air-conditioning system of the present invention has at least the following advantages compared with the related art.

[0053] (1)The problem of oil shortage in oil sump 2 is solved: By increasing the amount of oil in the return air pipe, more lubricating oil is directly supplied to oil sump 2, which reduces the wear caused by oil shortage in oil sump 2 during low-temperature startup or after defrosting.

[0054] (2)The reliability of compressor 1 is improved: During the ultra-low temperature heating startup stage and after defrosting, by replenishing lubricating oil in a timely manner, the service life of compressor 1 is extended.

[0055] (3)The user experience is improved: By avoiding frequent wear of compressor 1 under low-temperature conditions, the number of repairs is reduced, and at the same time, the efficient operation of the air-conditioning system is ensured, enhancing the user's comfort.

[0056] (4)The oil circuit management is optimized: The present invention not only solves the problem of oil shortage in oil sump 2, but also makes the oil circuit more efficient and safe through a reasonable oil circuit design, including components such as the oil inlet valve 41 and the oil pump.

[0057] (5)Intelligent control: The oil storage and replenishment device in the present invention has an automated control logic, which can automatically adjust the storage and replenishment of oil according to the working state of compressor 1 and the external ambient temperature, reducing the need for manual intervention.

[0058] In summary, by introducing the oil storage and replenishment device and its control logic, the present invention significantly improves the operating efficiency and reliability of the air-conditioning system under low-temperature conditions, and also enhances the user experience.

[0059] As Figure 1 and Figure 2 shown, according to some embodiments of the present invention, the return air pipe 3 has a horizontal section 31 and a vertical section 32. The horizontal section 31 is arranged downstream of the vertical section 32 along the oil flow direction. A bending portion 33 is formed between the horizontal section 31 and the vertical section 32. The inlet of the oil inlet pipe 4 is connected to the horizontal section 31 of the return air pipe 3 and is arranged adjacent to the bending portion 33, and the distance between the inlet of the oil inlet pipe 4 and the bending portion 33 is limited within a set distance.

[0060] It can be understood that the horizontal section 31 is a part of the return air pipe 3 that is horizontally arranged. The vertical section 32 is a part of the return air pipe 3 that is vertically arranged. The bending portion 33 is the turning point between the horizontal section 31 and the vertical section 32, that is, the position where the pipe shape changes.

[0061] The design of the horizontal section 31 and the vertical section 32 utilizes the effects of gravity and centrifugal force, which helps to separate oil and refrigerant. Among them, the bending design of the return air pipe 3 can utilize the centrifugal action at the bending end of the pipe to separate oil and gaseous refrigerant. Due to the relatively large density of oil, it will move towards the bottom of the pipe wall at the bending point, which is beneficial to the recovery of oil.

[0062] The inlet of the oil inlet pipeline 4 is arranged at the horizontal section 31 of the return air pipeline 3 and adjacent to the bending part 33, so that the centrifugal force can be fully utilized, making it easier for the oil to accumulate in this area and enter the oil storage container 5 through the oil inlet pipeline 4.

[0063] The distance between the inlet of the oil inlet pipeline 4 and the bending part 33 is limited within a set distance, which is to ensure that the oil can effectively accumulate near the bending part 33. Usually, this distance is greater than 50 mm to ensure that there is enough time for the oil and the gaseous refrigerant to separate, and the oil can smoothly flow into the oil inlet pipeline 4.

[0064] The working principle of the return air pipeline 3 in this embodiment is as follows: When the compressor 1 operates, the refrigerant gas containing oil will flow through the bending part 33 through the return air pipeline 3. Due to the centrifugal force, the oil will tend to move along the pipe wall towards the bottom and accumulate near the bending part 33. The inlet of the oil inlet pipeline 4 is arranged at this position, so the oil can more easily flow into the oil inlet pipeline 4 and finally enter the oil storage container 5. In this way, it can be ensured that when the compressor 1 needs additional oil volume (such as during low-temperature startup or after defrosting), there is enough oil volume to be supplemented into the compressor 1 to ensure the lubrication of the oil sump 2 and reduce wear.

[0065] As Figure 1 and Figure 2 shown, further, a first oil baffle 42 is formed on the side of the inlet of the oil inlet pipeline 4 away from the bending part 33. The first oil baffle 42 at least partially covers the cross-section of the horizontal section 31 perpendicular to the central axis direction, and a first gas passing gap 43 is left between the first oil baffle 42 and the upper inner wall of the horizontal section 31.

[0066] In this embodiment, the first oil baffle 42 is arranged at the inlet of the oil inlet pipeline 4 and is located on the side away from the bending part 33. The first oil baffle 42 at least partially covers the cross-section of the horizontal section 31 perpendicular to the central axis direction.

[0067] It can be understood that by setting the first oil baffle 42, the oil can be guided into the oil storage container 5, while allowing the gaseous refrigerant to continue flowing through the first gas passing gap 43.

[0068] The first gas passing gap 43 is the space left between the first oil baffle 42 and the upper inner wall of the horizontal section 31. This gap allows the gaseous refrigerant to continue flowing through this gap towards the compressor 1, while blocking larger oil droplets, making them more likely to flow into the oil storage container 5.

[0069] Specifically, the working principle of the first oil baffle 42 is as follows: When the gaseous refrigerant containing oil passes through the bent portion 33, the oil will be thrown towards the bottom of the pipe wall due to the centrifugal force. The oil then encounters the first oil baffle 42 and is guided into the oil inlet pipe 4 and flows into the oil storage container 5. The gaseous refrigerant continues to flow through the first gas passing gap 43 and finally returns to the compressor 1.

[0070] In this way, the first oil baffle 42 helps to separate the oil from the gaseous refrigerant, ensuring that more oil can be collected and stored. At the same time, through the design of the first oil baffle 42 and the first gas passing gap 43, the recovery efficiency of the oil can be effectively improved while ensuring the smooth flow of the gaseous refrigerant.

[0071] In summary, this design enables the oil storage and replenishment device to more effectively collect the excess oil during normal operation and replenish this oil back into the compressor 1 when needed, ensuring that there is sufficient lubrication in the oil sump 2 after cold start or defrosting, thereby reducing wear and improving the reliability of the compressor 1. For example, the height of the first oil baffle 42 is 8% of the diameter height of the return air pipe 3, and the diameter of the oil inlet pipe 4 is between 10% and 50% of the diameter of the return air pipe 3.

[0072] As Figure 1 and Figure 2 shown, according to some embodiments of the present invention, two symmetrically arranged second oil baffles 62 are formed on both sides of the outlet of the pressure balance pipe 95. The second oil baffles 62 at least partially cover the cross-section of the horizontal section 31 perpendicular to the central axis direction, and a second gas passing gap 63 is left between the second oil baffles 62 and the upper inner wall of the horizontal section 31.

[0073] In this embodiment, the second oil baffles 62 are arranged on both sides of the outlet of the pressure balance pipe 95 and are symmetrically arranged. The second oil baffles 62 at least partially cover the cross-section of the horizontal section 31 perpendicular to the central axis direction. It can be understood that by arranging the second oil baffles 62, the oil can be effectively prevented from flowing back from the return air pipe 3 into the pressure balance pipe 95.

[0074] The second gas passing gap 63 is the space left between the second oil baffles 62 and the upper inner wall of the horizontal section 31, and its function is to allow the gaseous refrigerant to continue to flow through this gap while blocking the backflow of the oil.

[0075] In summary, this design ensures that the oil can smoothly replenish from the oil storage container 5 to the compressor 1 while preventing the backflow of the oil, thereby improving the reliability and efficiency of the system.

[0076] As Figure 1 and Figure 2 shown, according to some embodiments of the present invention, the inlet of the oil outlet pipe 6 is located at the bottom of the oil storage container 5, and the outlet of the oil inlet pipe is located at the top of the oil storage container 5.

[0077] Furthermore, a capillary part is formed on the pressure balance pipe 95. In this way, the capillary part can prevent the oil from flowing away immediately because the pressure loss of the oil storage container 5 is relatively small.

[0078] As Figure 1 shown, according to some embodiments of the present invention, a filter 8 is further provided on the oil inlet pipeline 4 for filtering impurities in the oil before the oil inlet valve 41.

[0079] As Figure 1 and Figure 2 shown, according to some embodiments of the present invention, a temperature sensor 7 and a heater are further included. The temperature sensor 7 is used to detect the temperature of the oil storage container 5, and the heater is used to heat the oil storage container 5. Preferably, the outer periphery of the oil storage container 5 is wrapped with a heat insulation layer.

[0080] As Figure 1 and Figure 2 shown, in this embodiment, the temperature sensor 7 can be installed inside or on the surface of the oil storage container 5, and its function is to monitor the oil temperature inside the oil storage container 5 to ensure that the oil temperature is within a suitable range for the flow and replenishment of the oil.

[0081] The heater can be installed inside or around the oil storage container 5. Its function is to start the heater to increase the oil temperature when the oil temperature is lower than the preset value, ensuring that the oil can still maintain good fluidity under low temperature conditions. The function of the heat insulation layer is to reduce heat loss, maintain the stability of the oil temperature inside the oil storage container 5, reduce the working frequency of the heater, and save energy.

[0082] In this way, by monitoring the oil temperature in real time through the temperature sensor 7 and adjusting the oil temperature through the heater when necessary, it is ensured that the oil can maintain appropriate fluidity in any environment. Moreover, the heat insulation layer can reduce heat dissipation and reduce the usage frequency of the heater, contributing to energy conservation. For example, the heat insulation layer is heat insulating cotton, and its thickness is greater than or equal to 1 mm, and the cylinder volume of the oil storage container 5 should be 50% to 120% of the maximum oil filling volume of the oil sump of the compressor 1.

[0083] As Figure 1 and Figure 2 shown, according to some embodiments of the present invention, a number of oil passing grid baffles 51 are provided inside the oil storage container 5, and an oil passing gap is defined between every two adjacent oil passing grid baffles 51.

[0084] It should be noted that by setting these grid baffles, the fluctuation of the oil flowing into the inside of the oil storage container 5 can be reduced, ensuring that the oil is more stable inside the container. At the same time, the oil passing gap allows the oil to continue to flow through these gaps, but slows down the flow rate of the oil, contributing to the stable storage of the oil.

[0085] The working principle of the oil passing grid baffle 51 is as follows: When the oil fluid enters the oil storage container 5 through the oil inlet pipeline 4, it first encounters the first oil passing grid baffle 51. The oil fluid needs to continue flowing through the oil passing gap, and each time it flows, it will be blocked by the grid baffle, thereby reducing the fluctuation of the oil fluid. Through the design of multiple oil passing grid baffles 51 and oil passing gaps, the flow of the oil fluid inside the oil storage container 5 becomes smoother, which helps to stably store the oil fluid.

[0086] In this way, the design of the oil passing grid baffle 51 helps to reduce the fluctuation when the oil fluid enters the oil storage container 5, ensuring that the oil fluid is stored more stably inside the oil storage container 5. Further, by reducing the oil fluid fluctuation, the storage efficiency of the oil fluid can be improved, ensuring that it can be smoothly replenished from the oil storage container 5 to the compressor 1 when needed.

[0087] Some specific embodiments of the air conditioning system of the present invention are given below with reference to the accompanying drawings.

[0088] Embodiment 1: As Figure 1 and Figure 2 shown, the air conditioning system is a single-compressor refrigeration and heating system. The air conditioning system includes a compressor 1, a four-way valve 91, an outdoor heat exchanger 93, an indoor heat exchanger 94, a gas-liquid separator 92, and an oil storage and replenishment device connected through a refrigerant pipeline.

[0089] Among them, the oil storage and replenishment device includes an oil inlet pipeline 4, an oil storage container 5, an oil outlet pipeline 6, a pressure balance pipe 95, an oil inlet valve 41 provided on the oil inlet pipeline 4, and an oil outlet pump 61 provided on the oil outlet pipeline 6. The suction port 11 of the compressor 1 is connected to the gas outlet of the gas-liquid separator 92 through a suction pipeline 3. The inlet of the oil inlet pipeline 4 is connected to a part of the pipeline adjacent to the bending part 33 of the suction pipeline 3, and the outlet of the oil outlet pipeline 6 is connected to the oil replenishment port 13 of the compressor 1.

[0090] Embodiment 2: As Figure 3 shown, the air conditioning system is a two-compressor refrigeration and heating system. The air conditioning system includes two compressors 1, a four-way valve 91, an outdoor heat exchanger 93, an indoor heat exchanger 94, a gas-liquid separator 92, and an oil storage and replenishment device connected through a refrigerant pipeline. Among them, the two compressors 1 are connected in parallel.

[0091] Among them, the number of the oil storage and replenishment devices is one and includes an oil inlet pipeline 4, an oil storage container 5, an oil outlet pipeline 6, a pressure balance pipe 95, an oil inlet valve 41 provided on the oil inlet pipeline 4, and an oil outlet pump 61 provided on the oil outlet pipeline 6. The suction port 11 of the compressor 1 is connected to the gas outlet of the gas-liquid separator 92 through a suction pipeline 3. The inlet of the oil inlet pipeline 4 is connected to a part of the pipeline adjacent to the bending part 33 of the suction pipeline 3, and the outlet of the oil outlet pipeline 6 is connected to the oil replenishment port 13 of the compressor 1. At this time, the oil flowing out of the oil outlet pipeline 6 is divided into two paths and respectively flows to the suction ports 11 of the two compressors 1.

[0092] Embodiment 3: As Figure 4 shown, the air - conditioning system is a dual - compressor 1 refrigeration and heating system. The air - conditioning system includes two compressors 1, a four - way valve 91, an outdoor heat exchanger 93, an indoor heat exchanger 94, a gas - liquid separator 92, and an oil storage and replenishment device connected through refrigerant pipelines. Among them, the two compressors 1 are connected in parallel with each other.

[0093] Among them, the number of oil storage and replenishment devices is two, and each oil storage and replenishment device includes an oil inlet pipeline 4, an oil storage container 5, an oil outlet pipeline 6, a pressure balance pipe 95, an oil inlet valve 41 provided on the oil inlet pipeline 4, and an oil outlet pump 61 provided on the oil outlet pipeline 6.

[0094] Two oil storage and replenishment devices are respectively provided corresponding to the two compressors 1. Specifically, on the return air pipeline 3 of the return air port 11 of one of the compressors 1, the oil inlet pipeline 4 and the pressure balance pipe 95 in one of the oil storage and replenishment devices are connected, and its oil replenishment port is connected to the oil outlet pipeline 6. On the return air pipeline 3 of the return air port 11 of the other compressor 1, the oil inlet pipeline 4 and the pressure balance pipe 95 in the other oil storage and replenishment device are connected, and its oil replenishment port is connected to the oil outlet pipeline 6. At this time, each oil storage and replenishment device performs oil storage and replenishment operations on its respective compressor 1.

[0095] Next, the control method, control device, and air - conditioning system of the present invention will be described with reference to the accompanying drawings. Among them, before explaining the embodiments of the present invention in detail, the entire application scenario will be described first. The control method, control device, electronic device, and computer - readable storage medium of the air - conditioning system according to the embodiments of the present invention can be applied not only to the local air - conditioning system but also to the cloud platform in the Internet field, or the cloud platform in other types of Internet fields, or can also be applied to third - party devices. Among them, third - party devices may include various different types such as mobile phones, tablet computers, notebooks, in - vehicle computers, and other intelligent terminals.

[0096] Next, only the control method applicable to the air - conditioning system will be used as an example for illustration. It should be understood that the control method of the embodiments of the present invention can also be applied to the cloud platform and third - party devices.

[0097] As Figure 5 shown, the control method of the air - conditioning system according to the second - aspect embodiment of the present invention includes: Step S1, obtaining the working mode, outdoor ambient temperature, and working parameters of the air - conditioning system; Step S2, controlling and adjusting the working state of the oil inlet valve 41 and / or the oil outlet pump 61 according to at least one of the outdoor ambient temperature and working parameters in a specific working mode.

[0098] The air-conditioning system control method according to the second aspect embodiment of the present invention mainly relates to how to control the working states of the oil inlet valve 41 and the oil outlet pump 61 according to the outdoor ambient temperature, the working mode of the air-conditioning system, and the working parameters. The following is a detailed explanation of this control method.

[0099] In step S1, the actual temperature of the outdoor environment is obtained through the temperature sensor 7, and the current working mode of the air-conditioning system (such as the refrigeration mode or the heating mode) is determined. Among them, the working parameters include but are not limited to the frequency of the compressor 1, the start time of the compressor 1, etc. In step S2, according to the outdoor ambient temperature and the working parameters, the working states of the oil inlet valve 41 and the oil outlet pump 61 are determined through the control logic.

[0100] The specific control logic is as follows: In the refrigeration mode, both the oil inlet valve 41 and the oil outlet pump 61 are in the stopped state because the compressor 1 usually does not require additional oil in the refrigeration mode. In the heating mode, the opening condition of the oil inlet valve 41 is that in the normal mode, the frequency of the compressor 1 is higher than 75% of the maximum frequency and lasts for more than 10 minutes. The closing condition of the oil inlet valve 41 is that in the normal mode, the frequency of the compressor 1 is lower than 75% of the maximum frequency, or in special working conditions such as defrosting and oil return.

[0101] The opening condition of the oil outlet pump 61 is that after the defrosting or oil return mode is completed, the compressor 1 increases its frequency, the frequency of the compressor 1 reaches a specific value, or according to the outdoor ambient temperature and the frequency after the compressor 1 starts, it reaches a specific condition. The closing condition of the oil outlet pump 61 is that it is delayed to close after the frequency of the compressor 1 reaches a specific value, or according to the outdoor ambient temperature and the frequency after the compressor 1 starts, it reaches a specific condition.

[0102] In summary, the control method of the air-conditioning system given by the present invention intelligently controls the working states of the oil inlet valve 41 and the oil outlet pump 61 according to the outdoor ambient temperature and the working parameters, ensuring that there is enough oil in the oil sump 2 after super-low temperature heating start or defrosting to reduce wear and ensure the reliable operation of the compressor 1.

[0103] For example, when the ambient temperature is -10°C, after the air-conditioning system completes defrosting and enters the normal mode, the compressor 1 starts to increase its frequency. When the frequency of the compressor 1 rises to 45% of the maximum frequency, the oil outlet pump 61 is turned on to start supplying refrigerant oil to the compressor 1. As the frequency further rises to 65% of the maximum frequency, the oil outlet pump 61 is turned off. If the frequency of the compressor 1 does not continue to rise to 75% of the maximum frequency, and it is default that there is no oil in the oil storage container 5, then the oil outlet pump 61 will not be turned on next time. When the frequency of the compressor 1 rises to 75% of the maximum frequency, the oil inlet valve 41 is opened, and the oil storage container 5 starts to accumulate refrigerant oil. Before defrosting, when the frequency starts to decrease and during defrosting, the oil inlet valve 41 is closed. After defrosting, during the frequency increase stage, the oil outlet pump 61 is turned on again.

[0104] According to some embodiments of the present invention, in a specific working mode, the steps of controlling and adjusting the working state of the oil inlet valve 41 and / or the oil outlet pump 61 according to at least one of the outdoor environmental temperature and working parameters specifically include: In the heating mode, if it is determined that the frequency of the compressor 1 is greater than the first set frequency and lasts for at least the first set duration, then control the oil inlet valve 41 to open; If it is determined that the air conditioning system is in the heating mode and the frequency of the compressor 1 is less than or equal to the first set frequency, or if it is determined that the air conditioning system is in the defrosting mode or the oil return mode, control the oil inlet valve 41 to remain closed.

[0105] In this embodiment, in the heating mode, when the frequency of the compressor 1 is high and lasts for a period of time, it means that the system is running at full load. At this time, additional oil is required to ensure sufficient lubrication of the oil sump 2. Once the frequency of the compressor 1 drops below the set frequency, or the air conditioning system enters the defrosting mode or the oil return mode, the oil inlet valve 41 will be closed to avoid unnecessary oil consumption.

[0106] In this way, by intelligently controlling the opening and closing of the oil inlet valve 41, it is ensured that the oil sump 2 obtains sufficient oil lubrication when needed, reducing wear and improving the reliability of the compressor 1. And when additional oil is not required, the oil inlet valve 41 is closed to avoid waste, which helps to save energy. In addition, reducing the wear of the oil sump 2 can reduce maintenance requirements and improve the stability and user satisfaction of the air conditioning system.

[0107] For example, assume that the first set frequency is 75% of the maximum frequency and the first set duration is 10 minutes. When the frequency of the compressor 1 is higher than 75% of the maximum frequency and continues to run for more than 10 minutes, the oil inlet valve 41 opens. Once the frequency of the compressor 1 drops below 75% of the maximum frequency, or the air conditioning system enters the defrosting or oil return mode, the oil inlet valve 41 will be closed. This control method ensures that the oil sump 2 has sufficient oil lubrication after low-temperature startup or defrosting, reduces the wear of the oil sump 2, and improves the reliability of the compressor 1 and the overall efficiency of the air conditioning system.

[0108] According to some embodiments of the present invention, in a specific working mode, the steps of controlling and adjusting the working state of the oil inlet valve 41 and / or the oil outlet pump 61 according to at least one of the outdoor environmental temperature and working parameters specifically include: In the heating mode, if it is determined that the cumulative opening duration of the oil inlet valve 41 is greater than or equal to the second set duration, and the outdoor environmental temperature and working parameters meet the opening condition of the oil outlet pump 61, then control the oil outlet pump 61 to open.

[0109] Wherein, the opening condition of the oil outlet pump 61 includes any one of the following conditions: The outdoor ambient temperature is within the first temperature range, the static time of the compressor 1 exceeds the third set duration, and the frequency of the compressor 1 after startup reaches the second set frequency; The outdoor ambient temperature is within the second temperature range, the static time of the compressor 1 exceeds the fourth set duration, and the frequency of the compressor 1 after startup reaches the third set frequency; After the defrosting mode or the oil return mode is completed, the compressor 1 increases its frequency to the third set frequency; The outdoor ambient temperature is within the third temperature range, the static time of the compressor 1 exceeds the fifth set duration, and the frequency of the compressor 1 after startup reaches the fourth set frequency.

[0110] Among them, the first temperature range is greater than the second temperature range, and the second temperature range is greater than the third temperature range; and the third set duration is greater than the fourth set duration, the fourth set duration is greater than the fifth set duration; and the second set frequency is less than the third set frequency, the third set frequency is less than the fourth set frequency.

[0111] In this embodiment, it can be understood that when the cumulative opening duration of the oil inlet valve 41 is greater than or equal to the second set duration, it indicates that there is enough oil in the oil storage container 5. According to different ranges of the outdoor ambient temperature and the working state of the compressor 1, it is determined whether to open the oil pump 61.

[0112] Among them, as the outdoor ambient temperature decreases, the compressor 1 requires a longer static time and a higher startup frequency to open the oil pump 61. As the outdoor ambient temperature decreases, the conditions for opening the oil pump 61 become more stringent to ensure that the oil sump 2 obtains enough oil under low temperature conditions.

[0113] In this way, by intelligently controlling the opening of the oil pump 61 according to the outdoor ambient temperature and the working state of the compressor 1, it is ensured that there is enough oil in the oil sump 2 after cold start or defrosting, reducing the wear of the oil sump 2 and improving the reliability of the compressor 1.

[0114] Moreover, when no additional oil is required, the oil pump 61 will not be opened, reducing unnecessary energy consumption. In addition, reducing the wear of the oil sump 2 can reduce maintenance requirements, improving the stability of the air conditioning system and user satisfaction.

[0115] For example, assume that the first temperature range is from 0°C to -10°C, the second temperature range is from -10°C to -20°C, and the third temperature range is below -20°C.

[0116] The third set duration is 30 minutes, the fourth set duration is 20 minutes, and the fifth set duration is 10 minutes.

[0117] The second set frequency is 45% of the maximum frequency, the third set frequency is 65% of the maximum frequency, and the fourth set frequency is 75% of the maximum frequency.

[0118] According to some embodiments of the present invention, the step of controlling the operating state of the oil inlet valve 41 and / or the oil outlet pump 61 according to at least one of the outdoor ambient temperature and the operating parameters specifically includes: In the heating mode, if the outdoor ambient temperature and the operating parameters meet the closing condition of the oil outlet pump 61, then control the oil outlet pump 61 to close.

[0119] Wherein, the closing condition of the oil outlet pump 61 includes any one of the following conditions: After the air conditioning system operates in the defrosting mode or the oil return mode is completed and the compressor 1 increases its frequency to the target operating frequency, at this time, control the oil outlet pump 61 to close after a sixth set delay duration; The outdoor ambient temperature is in the first temperature range, the static time of the compressor 1 exceeds the third set duration and the frequency of the compressor 1 after startup reaches the fifth set frequency; The outdoor ambient temperature is in the second temperature range, the static time of the compressor 1 exceeds the fourth set duration and the frequency of the compressor 1 after startup reaches the sixth set frequency; The outdoor ambient temperature is in the third temperature range, the static time of the compressor 1 exceeds the fifth set duration and the frequency of the compressor 1 after startup reaches the seventh set frequency.

[0120] Wherein, the fourth set frequency is less than the fifth set frequency, the fifth set frequency is less than the sixth set frequency, and the sixth set frequency is less than the seventh set frequency.

[0121] In this embodiment, it can be understood that after the air conditioning system operates in the defrosting mode or the oil return mode is completed and the compressor 1 increases its frequency to the target operating frequency, the oil outlet pump 61 will close after a sixth set delay duration. As the outdoor ambient temperature decreases, the compressor 1 requires a longer static time and a higher startup frequency to close the oil outlet pump 61. As the outdoor ambient temperature decreases, the closing condition of the oil outlet pump 61 becomes more stringent to ensure that the oil sump 2 obtains sufficient oil volume under low temperature conditions.

[0122] In this way, by intelligently controlling the closing of the oil outlet pump 61 according to the outdoor ambient temperature and the operating state of the compressor 1, it is ensured that the oil sump 2 has sufficient oil volume after cold start or defrosting, reducing the wear of the oil sump 2 and improving the reliability of the compressor 1. At the same time, when no additional oil volume is required, the oil outlet pump 61 is closed in a timely manner, reducing unnecessary energy consumption.

[0123] For example, assume that the first temperature range is from 0°C to -10°C, the second temperature range is from -10°C to -20°C, and the third temperature range is below -20°C.

[0124] The third set duration is 30 minutes, the fourth set duration is 20 minutes, and the fifth set duration is 10 minutes.

[0125] The fifth set frequency is 55% of the maximum frequency, the sixth set frequency is 65% of the maximum frequency, and the seventh set frequency is 75% of the maximum frequency.

[0126] According to some embodiments of the present invention, the control logic for the opening and closing of the heating device is introduced as follows.

[0127] The opening conditions of the heating device include: Condition 1: The oil inlet valve 41 has been opened, which means there is oil in the oil storage container 5 that can be heated. Condition 2: The temperature in the oil storage container 5 is lower than the saturation temperature corresponding to the suction pressure of the air conditioning system plus 10°C.

[0128] The conditions for turning off the electric heating of the oil storage container 5 include: Condition 1: After the oil pump 61 is closed, in order to avoid heating when there is no oil in the oil storage container 5, which may cause damage to the heating element or safety hazards. Condition 2: The temperature in the oil storage container 5 reaches or is higher than the saturation temperature corresponding to the suction pressure of the air conditioning system plus 10°C.

[0129] The specific working principle is as follows: When the oil inlet valve 41 is opened and oil starts to accumulate in the oil storage container 5, and the temperature in the oil storage container 5 is lower than the set value, the heating device starts to work to increase the temperature of the oil. Once the oil pump 61 is closed, it indicates that the oil in the oil storage container 5 has been pumped out, and at this time, the heating device is turned off to avoid dry burning. Additionally, if the temperature in the oil storage container 5 has reached or exceeded the set value, the heating device will also automatically turn off to avoid overheating.

[0130] In this way, by heating the oil in the oil storage container 5, it can be ensured that the oil still has good fluidity under low-temperature conditions, so that it can be smoothly replenished into the compressor 1 when needed. And by setting temperature conditions to control the switch of the heating device, unnecessary heating can be avoided, saving energy. In addition, by turning off the heating device in the oil-free state, the risk of dry burning can be avoided, improving the safety of the system.

[0131] For example, assume that the air conditioning system is operating in the low-temperature heating mode and the outdoor ambient temperature is very low. After the compressor 1 starts, the frequency gradually increases.

[0132] When the frequency of the compressor 1 reaches a certain value, the oil inlet valve 41 is opened, and the oil storage container 5 starts to accumulate oil. If the temperature in the oil storage container 5 is lower than the set value (such as lower than the saturation temperature corresponding to the suction pressure of the air conditioning system plus 10°C), the heating device starts to work.

[0133] Once the oil outlet pump 61 is closed, it indicates that the oil in the oil storage container 5 has been pumped out completely, and then the heating device is turned off. If the temperature in the oil storage container 5 reaches or exceeds the set value (for example, reaches the saturation temperature corresponding to the suction pressure of the air conditioning system plus 10°C), the heating device will also be automatically turned off.

[0134] As Figure 6 shown, the control device of the air conditioning system according to the third aspect embodiment of the present invention includes: An acquisition module 110, configured to acquire the working mode, outdoor ambient temperature, and working parameters of the air conditioning system; A control module 120, configured to control and adjust the working state of the oil inlet valve 41 and / or the oil outlet pump 61 according to at least one of the outdoor ambient temperature and the working parameters in a specific working mode.

[0135] Figure 7 illustrates a schematic physical structure diagram of an electronic device. As Figure 7 shown, the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communication interface 820, and the memory 830 complete mutual communication through the communication bus 840. The processor 810 can call the logical instructions in the memory 830 to execute the control method of the air conditioning system, including: acquiring the working mode, outdoor ambient temperature, and working parameters of the air conditioning system; in a specific working mode, controlling and adjusting the working state of the oil inlet valve 41 and / or the oil outlet pump 61 according to at least one of the outdoor ambient temperature and the working parameters.

[0136] In addition, when the logical instructions in the above-mentioned memory 830 are implemented in the form of a software functional unit and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. And the aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0137] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the control method of the air-conditioning system provided by each of the above methods, including: obtaining the working mode, outdoor ambient temperature, and working parameters of the air-conditioning system; and controlling and adjusting the working state of the fuel inlet valve 41 and / or the oil outlet pump 61 according to at least one of the outdoor ambient temperature and the working parameters under a specific working mode.

[0138] In another aspect, the present invention also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute the control method of the air-conditioning system provided by each of the above methods, including: obtaining the working mode, outdoor ambient temperature, and working parameters of the air-conditioning system; and controlling and adjusting the working state of the fuel inlet valve 41 and / or the oil outlet pump 61 according to at least one of the outdoor ambient temperature and the working parameters under a specific working mode.

[0139] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. A person of ordinary skill in the art can understand and implement it without creative labor.

[0140] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solutions, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. The computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disc, etc., and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0141] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or perform equivalent replacements for some of the technical features. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims

1. An air conditioning system, characterized in that, Comprising: A compressor and a suction pipe. The compressor has a suction port and an oil replenishment port. The suction port is communicated with the suction pipe, and the oil replenishment port is communicated with the oil sump inside the compressor; An oil storage and replenishment device, including an oil inlet pipe, an oil storage container, and an oil outlet pipe. The inlet and outlet of the oil inlet pipe are respectively communicated with the suction pipe and the oil storage container, and the inlet and outlet of the oil outlet pipe are respectively communicated with the oil storage container and the oil replenishment port; an oil inlet valve is provided on the oil inlet pipe, and an oil outlet pump is provided on the oil outlet pipe.

2. The air conditioning system according to claim 1, characterized in that A pressure balance pipe is also connected between the suction pipe and the oil storage container. The suction pipe has a horizontal section and a vertical section. The horizontal section is arranged downstream of the vertical section along the oil flow direction. A bending part is formed between the horizontal section and the vertical section. The inlet of the oil inlet pipe is communicated with the horizontal section of the suction pipe and is arranged adjacent to the bending part, and the distance between the inlet of the oil inlet pipe and the bending part is limited within a set distance.

3. The air-conditioning system according to claim 2, wherein, A first oil baffle is formed on the side of the inlet of the oil inlet pipe away from the bending part. The first oil baffle at least partially covers the cross-section of the horizontal section perpendicular to the central axis direction, and a first air passage gap is left between the first oil baffle and the upper inner wall of the horizontal section.

4. The air conditioning system according to claim 2, characterized in that, Two symmetrically arranged second oil baffles are formed on both sides of the outlet of the pressure balance pipe. The second oil baffles at least partially cover the cross-section of the horizontal section perpendicular to the central axis direction, and a second air passage gap is left between the second oil baffles and the upper inner wall of the horizontal section.

5. The air conditioning system according to any one of claims 1 to 4, characterized in that, It further includes a temperature sensor and a heater. The temperature sensor is used to detect the temperature of the oil storage container, and the heater is used to heat the oil storage container. Preferably, the outer periphery of the oil storage container is wrapped with a heat insulation layer; And / or, a plurality of oil passing grid baffles are provided inside the oil storage container, and an oil passing gap is defined between every two adjacent oil passing grid baffles.

6. The air-conditioning system according to claim 2, characterized in that, The inlet of the pressure balance pipe is located at the top of the oil storage container, and its outlet is connected to the suction pipe, and / or, The pressure balance pipe further includes a capillary section.

7. A control method for an air conditioning system according to any one of claims 1 to 6, characterized in that, Comprising: Obtaining the working mode, outdoor ambient temperature and working parameters of the air conditioning system; In a specific working mode, according to at least one of the outdoor ambient temperature and the working parameters, controlling and adjusting the working state of the oil inlet valve and / or the oil outlet pump.

8. The control method of the air conditioning system according to claim 7, wherein, The step of controlling and adjusting the working state of the oil inlet valve and / or the oil outlet pump according to at least one of the outdoor ambient temperature and the working parameters in a specific working mode specifically includes: In the heating mode, when it is determined that the frequency of the compressor is greater than a first set frequency and lasts for at least a first set duration, controlling the oil inlet valve to open; When it is determined that the air conditioning system is in the heating mode and the frequency of the compressor is less than or equal to the first set frequency, or when it is determined that the air conditioning system is in the defrosting mode or the oil return mode, controlling the oil inlet valve to remain in the closed state.

9. The control method of the air conditioning system according to claim 6, wherein The step of controlling and adjusting the working state of the oil inlet valve and / or the oil outlet pump according to at least one of the outdoor environmental temperature and the working parameters in a specific working mode specifically includes: In the heating mode, if it is determined that the cumulative opening duration of the oil inlet valve is greater than or equal to a second set duration, and the outdoor environmental temperature and the working parameters meet the oil outlet pump opening condition, then control the oil outlet pump to open; Among them, the oil outlet pump opening condition includes any one of the following conditions: The outdoor environmental temperature is in a first temperature range, the static time of the compressor exceeds a third set duration, and the frequency of the compressor after startup reaches a second set frequency; The outdoor environmental temperature is in a second temperature range, the static time of the compressor exceeds a fourth set duration, and the frequency of the compressor after startup reaches a third set frequency; After the defrosting mode or the oil return mode is completed, the compressor increases its frequency to the third set frequency; The outdoor environmental temperature is in a third temperature range, the static time of the compressor exceeds a fifth set duration, and the frequency of the compressor after startup reaches a fourth set frequency; Among them, the first temperature range is greater than the second temperature range, and the second temperature range is greater than the third temperature range; and the third set duration is greater than the fourth set duration, the fourth set duration is greater than the fifth set duration; and the second set frequency is less than the third set frequency, the third set frequency is less than the fourth set frequency.

10. The control method of the air conditioning system according to claim 8, wherein The step of controlling and adjusting the working state of the oil inlet valve and / or the oil outlet pump according to at least one of the outdoor environmental temperature and the working parameters in a specific working mode specifically includes: In the heating mode, if the outdoor environmental temperature and the working parameters meet the oil outlet pump closing condition, then control the oil outlet pump to close; Among them, the oil outlet pump closing condition includes any one of the following conditions: After the defrosting mode or the oil return mode of the air conditioning system is completed, the compressor increases its frequency to the target operating frequency, and at this time, control the oil outlet pump to close after a sixth set delay duration; The outdoor environmental temperature is in the first temperature range, the static time of the compressor exceeds the third set duration, and the frequency of the compressor after startup reaches the fifth set frequency; The outdoor environmental temperature is in the second temperature range, the static time of the compressor exceeds the fourth set duration, and the frequency of the compressor after startup reaches the sixth set frequency; The outdoor environmental temperature is in the third temperature range, the static time of the compressor exceeds the fifth set duration, and the frequency of the compressor after startup reaches the seventh set frequency; Among them, the fourth set frequency is less than the fifth set frequency, the fifth set frequency is less than the sixth set frequency, and the sixth set frequency is less than the seventh set frequency.

11. A control device for an air conditioning system according to any one of claims 1 to 6, characterized in that, It includes: An acquisition module for acquiring the working mode, outdoor environmental temperature and working parameters of the air conditioning system; A control module for controlling and adjusting the working state of the oil inlet valve and / or the oil outlet pump according to at least one of the outdoor environmental temperature and the working parameters in a specific working mode.

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