Air conditioner and control method and device thereof

Abstract

The invention provides an air conditioner and a control method and device thereof. The air conditioner comprises a compressor and an air return pipeline, the compressor is provided with an air return port, one side of the air return port communicates with a scroll plate in the compressor, and the other side of the air return port is connected to the air return pipeline located on the outer side of the compressor; the oil storage and supplement device comprises an oil inlet pipeline, an oil storage container and an oil outlet pipeline which are sequentially connected, an inlet of the oil inlet pipeline and an outlet of the oil outlet pipeline are both communicated to the air return pipeline, and in the refrigerant circulation direction, the inlet of the oil inlet pipeline is located on the upstream of the outlet of the oil outlet pipeline; an oil inlet valve is arranged on the oil inlet pipeline, and an oil outlet pump is arranged on the oil outlet pipeline. The compressor is provided with the oil storage and supplement device, redundant refrigerant oil is stored during normal operation, the oil is released when needed to guarantee reliable operation of the compressor and reduce abrasion of the scroll plate, and therefore the problem that the scroll plate lacks oil after the compressor is started in an ultralow-temperature heating mode or defrosted can be solved.

Description

Technical Field

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

[0002] In the related art, air conditioners are becoming more and more popular, especially large multi-connected air conditioner 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 of the scroll plate often occurs. The main reason is that during the ultra-low temperature heating startup stage, defrosting, or after the heating oil return is completed, a large amount of oil in the oil sump is pumped away and cannot be replenished with a large amount of new oil. The phenomenon of oil shortage in the compressor of the air conditioner unit will cause damage to the moving parts of the compressor. For the air conditioner unit, during the ultra-low temperature heating startup process and after defrosting, the scroll plate is prone to oil shortage, and thus the scroll plate is prone to wear.

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

[0004] However, the above methods in the related art alone 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 scroll plate, and limiting the compressor frequency increase speed causes the compressor to be unable to increase the frequency for a long time, resulting in poor air conditioner performance and poor user experience comfort. Summary of the Invention

[0005] The present invention provides an air conditioner and its control method and control device to solve the defects existing in the prior art and achieve the following technical effects: It 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 reduce the wear of the scroll plate, thereby solving the problem of oil shortage in the scroll plate after ultra-low temperature heating startup or defrosting of the compressor.

[0006] The air conditioner according to the first aspect embodiment of the present invention includes: A compressor and a suction pipe having a suction port. One side of the suction port is connected to the scroll plate inside the compressor, and the other side is connected to the suction pipe located outside the compressor. An oil storage and replenishment device, including an oil inlet pipe, an oil storage container, and an oil outlet pipe connected in sequence. The inlet of the oil inlet pipe and the outlet of the oil outlet pipe are both connected to the suction pipe, and in the refrigerant flow direction, the inlet of the oil inlet pipe is upstream of the outlet of the oil outlet pipe; 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 some embodiments of the present invention, the return air 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 portion 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 return air pipe and is arranged adjacent to the bending portion, and the distance between the inlet of the oil inlet pipe and the bending portion is limited within a set distance.

[0008] According to some embodiments of the present invention, a first oil baffle is formed on one side of the inlet of the oil inlet pipe away from the bending portion. 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 passing gap is left between the first oil baffle and the upper inner wall of the horizontal section.

[0009] And / or, two symmetrically arranged second oil baffles are formed on both sides of the outlet of the oil outlet 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 passing gap is left between the second oil baffles and the upper inner wall of the horizontal section.

[0010] According to some embodiments of the present invention, the inlet of the oil outlet pipe is located at the bottom of the oil storage container, and the outlet of the oil inlet pipe is located at the top of the oil storage container; Preferably, a capillary portion is formed on the oil outlet pipe.

[0011] According to some embodiments 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.

[0012] According to the control method of the air conditioner according to the second aspect embodiment of the present invention based on the first aspect embodiment of the present invention, it includes: Obtain the working mode, outdoor ambient temperature and working parameters of the air conditioner; 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 some embodiments 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 conditioner 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 conditioner is in the defrosting mode or the oil return mode, control the oil inlet valve to remain closed.

[0014] According to some embodiments 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 some embodiments 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 air conditioner runs the defrosting mode or the oil return mode is completed, the compressor frequency increases to the target operating frequency, and 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 conditioner 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 conditioner; 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 conditioner, which is provided with an oil storage and replenishment device. By storing excess refrigerant oil during normal operation and releasing this oil when needed, it ensures the reliable operation of the compressor and reduces the wear of the scroll plate, thereby solving the problem of oil shortage of the scroll plate during ultra-low temperature heating startup or after defrosting.

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

[0019] (1) Solved the problem of oil shortage of the scroll plate: By increasing the amount of oil in the return air pipe, more lubricating oil is directly provided to the scroll plate, which reduces the wear of the scroll plate caused by oil shortage 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 timely replenishing lubricating oil, excessive wear of the scroll plate is avoided, thereby extending the service life of the compressor.

[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 conditioner 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 of the scroll plate, 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 working 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, while also enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in 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, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic structural diagram of an air conditioner provided by 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 conditioner provided by the present invention.

[0028] Figure 3 It is a schematic structural diagram of an air conditioner provided by Embodiment 2 of the present invention.

[0029] Figure 4 It is a schematic structural diagram of an air conditioner provided by Embodiment 3 of the present invention.

[0030] Figure 5 It is a schematic step diagram of the control method of the air conditioner provided by the present invention.

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

[0032] Figure 7 It is a schematic structural diagram of the electronic device provided by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS: 1. Compressor; 11. Suction port; 12. Discharge port; 2. Scroll plate; 3. Return air pipeline; 31. Horizontal section; 32. Vertical section; 33. Bent portion; 4. Oil inlet pipeline; 41. Oil inlet valve; 42. First oil baffle; 43. First air passing gap; 5. Oil storage container; 51. Oil passing grid baffle; 6. Oil outlet pipeline; 61. Oil outlet pump; 62. Second oil baffle; 63. Second air passing gap; 7. Temperature sensor; 8. Filter; 91. Four-way valve; 92. Gas-liquid separator; 93. Outdoor heat exchanger; 94. Indoor heat exchanger. 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 based on the embodiments in the present invention without making creative efforts shall fall within the protection scope 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 and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0036] A kind of air conditioner and its control method and control device are given below with reference to the accompanying drawings to describe the present invention.

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

[0038] The compressor 1 has a suction port 11 and a discharge port 12. One side of the suction port 11 communicates with the scroll disk 2 inside the compressor 1, and the other side is connected to the suction pipe 3 located outside the compressor 1.

[0039] The oil storage and oil replenishment device includes an oil inlet pipe 4, an oil storage container 5 and an oil outlet pipe 6 connected in sequence. The inlet of the oil inlet pipe 4 and the outlet of the oil outlet pipe 6 are both communicated with the suction pipe 3, and in the refrigerant flow direction, the inlet of the oil inlet pipe 4 is located upstream of the outlet of the oil outlet pipe 6; an oil inlet valve 41 is provided on the oil inlet pipe 4, and an oil outlet pump 61 is provided on the oil outlet pipe 6.

[0040] For the air conditioner given by the present invention, the main purpose of setting the oil storage and oil replenishment device for this air conditioner is to solve the problem of lack of oil in the scroll disk 2 when the compressor 1 starts heating at ultra-low temperature or after defrosting, by storing the excess refrigerant oil during normal operation and releasing the oil when needed to ensure the reliable operation of the compressor 1 and reduce the wear of the scroll disk 2.

[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 lower horizontal position after the bent pipe section of the return air pipeline 3. The centrifugal force 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 effect of the oil baffle.

[0042] The oil storage container 5 can include the 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 oil fluctuation. There are a heating device and a heat insulation layer around it to maintain the oil temperature, and a temperature sensor 7 is installed inside to monitor the oil temperature. The oil outlet pipeline 6 connects the oil storage container 5 and the suction port of the compressor 1, and is used to replenish the refrigeration oil to the scroll disk 2. An oil 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 refrigeration oil is collected and stored in the oil storage container 5; after low-temperature startup or defrosting, the oil pump 61 is opened, and the oil in the oil storage container 5 is pumped back to the compressor 1 to supplement the oil required by the scroll disk 2.

[0044] Specifically, the working process of the air conditioner 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 refrigeration oil enters the oil storage container 5 through the oil inlet pipeline 4, and in 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 pump 61 is opened. At this time, the oil in the oil storage container 5 is pumped back to the scroll disk 2 of the compressor 1 through the oil outlet pipeline 6 and the oil pump 61.

[0045] For example, in the specific control logic, in the refrigeration mode, both the oil inlet valve 41 and the oil pump 61 stop working because generally no additional oil replenishment is 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 entering the oil storage container 5. The oil 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 replenishment. 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 the 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 scroll disk 2, and improve the reliability of the compressor 1 and the overall efficiency of the air conditioning system.

[0048] In the related art, air conditioners are becoming more and more popular, especially large multi-connected air conditioner 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 start-up stage, defrosting, or after the heating oil return is completed, the phenomenon of oil shortage and wear of the scroll disk often occurs. This is mainly because a large amount of oil in the oil sump is pumped away during the ultra-low temperature heating start-up stage, defrosting, or after the heating oil return is completed, and new and sufficient oil cannot be replenished. The lack of oil in the compressor of the air conditioner unit will cause damage to the moving parts of the compressor. For the air conditioner unit, during the ultra-low temperature heating start-up process of the compressor and after defrosting, the scroll disk is prone to oil shortage, which is likely to cause wear of the scroll disk.

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

[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 scroll disk, and limiting the compressor frequency increase speed causes the compressor to be unable to increase the frequency for a long time, resulting in poor air conditioner performance and poor user experience comfort.

[0051] Therefore, in order to solve the technical defects existing in the above related art, the present invention provides an air conditioner. The air conditioner is provided with an oil storage and oil replenishment device, which stores excess refrigerant oil during normal operation and releases the oil when needed to ensure the reliable operation of the compressor 1 and reduce the wear of the scroll disk 2, thereby solving the problem of oil shortage in the scroll disk 2 after ultra-low temperature heating start-up or defrosting of the compressor 1.

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

[0053] (1) Solve the problem of oil shortage in the scroll disk 2: By increasing the amount of oil in the return air pipe, more lubricating oil is directly provided to the scroll disk 2, which reduces the wear of the scroll disk 2 caused by oil shortage during low-temperature start-up or defrosting.

[0054] (2) Improve the reliability of the compressor 1: During the ultra-low temperature heating start-up stage and after defrosting, by replenishing lubricating oil in a timely manner, excessive wear of the scroll disk 2 is avoided, thereby extending the service life of the compressor 1.

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

[0056] (4) Optimized oil circuit management: The present invention not only solves the problem of oil shortage in the scroll disk 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 operating state of the 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 suction line 3 has a horizontal section 31 and a vertical section 32. The horizontal section 31 is disposed 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 line 4 is connected to the horizontal section 31 of the suction line 3 and is disposed adjacent to the bending portion 33, and the distance between the inlet of the oil inlet line 4 and the bending portion 33 is limited within a set distance.

[0060] It can be understood that the horizontal section 31 is a portion of the suction line 3 that is horizontally arranged. The vertical section 32 is a portion of the suction line 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 suction line 3 can utilize the centrifugal effect at the bent 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 place, which is beneficial to the recovery of oil.

[0062] The inlet of the oil inlet line 4 is arranged in the horizontal section 31 of the suction line 3 and is adjacent to the bending portion 33, so that the centrifugal force can be fully utilized to make the oil easier to accumulate in this area and enter the oil storage container 5 through the oil inlet line 4.

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

[0064] In this embodiment, the working principle of the suction pipeline 3 is as follows: When the compressor 1 operates, the refrigerant gas containing oil will flow through the bending part 33 via the suction pipeline 3. Due to the centrifugal force, the oil tends to move along the pipe wall towards the bottom and accumulates near the bending part 33. The inlet of the oil inlet pipeline 4 is arranged at this position, so the oil can flow into the oil inlet pipeline 4 more easily and finally enter the oil storage container 5. In this way, it can be ensured that when the compressor 1 requires additional oil (such as during low-temperature startup or after defrosting), there is enough oil to be replenished into the compressor 1 to ensure the lubrication of the scroll disk 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 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 it more likely for them 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 bending part 33, the oil is thrown towards the bottom of the pipe wall due to the centrifugal force. The oil then encounters the first oil baffle 42, is guided into the oil inlet pipeline 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 excess oil during normal operation and replenish this oil back into the compressor 1 when needed, ensuring that the scroll plate 2 has sufficient lubrication 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 pipe 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, on both sides of the outlet of the oil outlet pipe 6, two symmetrically arranged second oil baffles 62 are formed. 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 passage 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 oil outlet pipe 6 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 oil outlet pipe 6, ensuring that the oil can only flow in one direction.

[0074] The second gas passage 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 flowing through this gap while blocking the backflow of oil.

[0075] The working principle of the second oil baffle 62 is as follows: When the oil needs to be replenished from the oil storage container 5 to the compressor 1, the oil pump pushes the oil through the oil outlet pipe 6. When the oil reaches the outlet through the oil outlet pipe 6, it encounters the second oil baffle 62 and is guided into the suction port of the compressor 1. The second gas passage gap 63 left between the second oil baffles 62 and the upper inner wall of the horizontal section 31 allows the gaseous refrigerant to pass through but blocks the backflow of oil.

[0076] In this way, the design of the second oil baffle 62 ensures that the oil can only flow unidirectionally from the oil storage container 5 to the compressor 1, preventing the oil from flowing back from the return air pipe 3 into the oil outlet pipe 6. At the same time, through the design of the second oil baffle 62 and the second gas passage gap 63, the replenishment efficiency of the oil can be effectively improved while ensuring the smooth flow of the gaseous refrigerant.

[0077] In summary, this design ensures that the oil can smoothly flow from the oil storage container 5 to the compressor 1 while preventing the backflow of oil, thereby improving the reliability and efficiency of the system.

[0078] As Figure 1 and Figure 2As shown, according to some embodiments of the present invention, the inlet of the oil outlet pipeline 6 is located at the bottom of the oil storage container 5, and the outlet of the oil inlet pipeline is located at the top of the oil storage container 5.

[0079] Further, a capillary part is formed on the oil outlet pipeline 6.

[0080] It can be understood that since the inlet of the oil outlet pipeline 6 is located at the bottom of the oil storage container 5, when the oil pump works, oil can be pumped from the bottom of the oil storage container 5 to ensure that as much oil in the oil storage container 5 as possible is utilized. Since the outlet of the oil inlet pipeline 4 is located at the top of the oil storage container 5, when the oil enters the oil storage container 5, it will be injected from the top, which helps the uniform distribution and storage of the oil.

[0081] Among them, the capillary part is a special part formed on the oil outlet pipeline 6, and its function is to control the flow rate of the oil to ensure that the oil can be smoothly transported from the oil storage container 5 to the compressor 1.

[0082] In this way, by setting the inlet of the oil outlet pipeline 6 at the bottom of the oil storage container 5, it can be ensured that as much oil as possible is collected and transported to the compressor 1. And the outlet of the oil inlet pipeline 4 is located at the top of the oil storage container 5, which helps the uniform distribution of the oil and is also conducive to the separation of the oil from the gaseous refrigerant.

[0083] In addition, the presence of the capillary part can control the flow rate of the oil, prevent the oil from flowing too fast or too slow, and ensure that the oil can be smoothly replenished to the compressor 1, especially when starting at low temperature or after defrosting, when the scroll disk 2 requires additional oil.

[0084] 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.

[0085] 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.

[0086] 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 in the oil storage container 5 to ensure that the oil temperature is within a suitable range for the flow and replenishment of the oil.

[0087] The heater can be installed inside or around the oil storage container 5. Its function is to start when the oil temperature is lower than the preset value to increase the oil temperature, ensuring that the oil can still maintain good fluidity under low-temperature conditions. The function of the thermal 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.

[0088] In this way, the oil temperature is monitored in real time by the temperature sensor 7, and the oil temperature is adjusted by the heater when necessary, ensuring that the oil can maintain appropriate fluidity in any environment. Moreover, the thermal insulation layer can reduce heat dissipation, lower the usage frequency of the heater, and contribute to energy conservation. For example, the thermal insulation layer is made of thermal insulation cotton, and its thickness is greater than or equal to 1 mm. The cylindrical volume of the oil storage container 5 should be 50% to 120% of the maximum oil injection volume of the oil sump of the compressor 1.

[0089] As Figure 1 and Figure 2 shown, according to some embodiments of the present invention, several sections 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.

[0090] 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 flowing through these gaps, but slows down the flow rate of the oil, which helps with the stable storage of the oil.

[0091] The working principle of the oil passing grid baffle 51 is as follows: when the oil flows into the oil storage container 5 through the oil inlet pipeline 4, it first encounters the first oil passing grid baffle 51. The oil 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. Through the design of multiple oil passing grid baffles 51 and oil passing gaps, the flow of the oil inside the oil storage container 5 becomes smoother, which helps with the stable storage of the oil.

[0092] In this way, the design of the oil passing grid baffle 51 helps to reduce the fluctuation when the oil enters the oil storage container 5, ensuring that the oil is stored more stably inside the oil storage container 5. Further, by reducing the oil fluctuation, the storage efficiency of the oil can be improved, ensuring that it can be smoothly replenished from the oil storage container 5 to the compressor 1 when needed.

[0093] Some specific embodiments of the air conditioner of the present invention are given below with reference to the accompanying drawings.

[0094] Embodiment 1: As Figure 1 and Figure 2 shown, the air conditioner is a single-compressor 1 refrigeration and heating system. The air conditioner 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 oil replenishment device connected through a refrigerant pipeline.

[0095] Among them, the oil storage and replenishment device includes an oil inlet pipeline 4, an oil storage container 5, an oil outlet pipeline 6, 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 partial pipeline adjacent to the bending part 33 of the suction pipeline 3. The outlet of the oil outlet pipeline 6 is also connected to the suction pipeline 3 and is located downstream of the inlet of the oil inlet pipeline 4.

[0096] Embodiment 2: As Figure 3 shown, the air conditioner is a dual-compressor 1 refrigeration and heating system. The air conditioner 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.

[0097] Among them, the number of oil storage and replenishment devices is one and includes an oil inlet pipeline 4, an oil storage container 5, an oil outlet pipeline 6, 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 partial pipeline adjacent to the bending part 33 of the suction pipeline 3. The outlet of the oil outlet pipeline 6 is also connected to the suction pipeline 3 and is located downstream of the inlet of the oil inlet pipeline 4. 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.

[0098] Embodiment 3: As Figure 4 shown, the air conditioner is a dual-compressor 1 refrigeration and heating system. The air conditioner 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.

[0099] 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, 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.

[0100] Two oil storage and replenishment devices are respectively arranged corresponding to the two compressors 1. Specifically, the oil inlet pipeline 4 and the oil outlet pipeline 6 in one of the oil storage and replenishment devices are connected to the suction pipeline 3 of the suction port 11 of one of the compressors 1, and the oil inlet pipeline 4 and the oil outlet pipeline 6 in the other oil storage and replenishment device are connected to the suction pipeline 3 of the suction port 11 of the other compressor 1. At this time, each oil storage and replenishment device performs oil storage and replenishment operations on its respective compressor 1.

[0101] The control method, control device and air conditioner of the present invention will be described below with reference to the accompanying drawings. Among them, before the embodiments of the present invention are described in detail, the entire application scenario will be described first. The control method, control device, electronic device and computer-readable storage medium of the embodiments of the present invention can be applied not only to the local air conditioner, 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, the third-party devices may include various different types such as mobile phones, tablets, notebooks, in-vehicle computers and other intelligent terminals.

[0102] Below, only the control method applicable to the air conditioner 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.

[0103] As Figure 5 shown, the control method of the air conditioner 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 conditioner; 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 the working parameters in a specific working mode.

[0104] The control method of the air conditioner according to the second aspect embodiment of the present invention mainly relates to how to control the working state of the oil inlet valve 41 and the oil outlet pump 61 according to the outdoor ambient temperature, the working mode of the air conditioner and the working parameters. The following is a detailed explanation of this control method.

[0105] 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 conditioner (such as the cooling 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 starting time of the compressor 1, etc. In step S2, according to the outdoor ambient temperature and the working parameters, the working state of the oil inlet valve 41 and the oil outlet pump 61 is determined through the control logic.

[0106] The specific control logic is as follows: In the cooling 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 cooling mode. In the heating mode, the opening condition of the oil inlet valve 41 is: 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: 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.

[0107] The opening conditions for the oil pump 61 are as follows: after the defrosting or oil return mode is completed, the compressor 1 increases its frequency. When the frequency of the compressor 1 reaches a specific value, or when specific conditions are met according to the outdoor ambient temperature and the frequency of the compressor 1 after startup. The closing conditions for the oil pump 61 are as follows: after the frequency of the compressor 1 reaches a specific value, it is delayed to close, or when specific conditions are met according to the outdoor ambient temperature and the frequency of the compressor 1 after startup.

[0108] In summary, for the air conditioner control method provided by the present invention, by intelligently controlling the working states of the oil inlet valve 41 and the oil pump 61 according to the outdoor ambient temperature and working parameters, it is ensured that after ultra-low temperature heating startup or defrosting, the scroll disk 2 has sufficient oil volume to reduce wear and ensure the reliable operation of the compressor 1.

[0109] For example, when the ambient temperature is -10°C, after the air conditioner 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 pump 61 is turned on to start replenishing the refrigerant oil to the compressor 1. As the frequency further rises to 65% of the maximum frequency, the oil 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 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 turned on, 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 turned off. After defrosting, during the frequency increase stage, the oil pump 61 is turned on again.

[0110] According to some embodiments of the present invention, in a specific working mode, the steps of controlling and adjusting the working states of the oil inlet valve 41 and / or the oil pump 61 according to at least one of the outdoor ambient temperature and working parameters specifically include: In the heating mode, when 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; When it is determined that the air conditioner is in the heating mode and the frequency of the compressor 1 is less than or equal to the first set frequency, or when it is determined that the air conditioner is in the defrosting mode or the oil return mode, control the oil inlet valve 41 to remain in the closed state.

[0111] In this embodiment, in the heating mode, when the frequency of the compressor 1 is relatively high and lasts for a period of time, it means that the system is operating at full load. At this time, additional oil is needed to ensure that the scroll disk 2 is sufficiently lubricated. Once the frequency of the compressor 1 drops below the set frequency, or the air conditioner enters the defrosting mode or the oil return mode, the oil inlet valve 41 will be closed to avoid unnecessary oil consumption.

[0112] In this way, by intelligently controlling the opening and closing of the oil inlet valve 41, it is ensured that the scroll disk 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 and contribute to energy conservation. In addition, reducing the wear of the scroll disk 2 can reduce maintenance requirements and improve the stability of the air-conditioning system and user satisfaction.

[0113] 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 continuously operates for more than 10 minutes, the oil inlet valve 41 is opened. Once the frequency of the compressor 1 drops below 75% of the maximum frequency, or the air conditioner enters the defrosting or oil return mode, the oil inlet valve 41 will be closed. This control method ensures that the scroll disk 2 has sufficient oil lubrication after cold start or defrosting, reduces the wear of the scroll disk 2, and improves the reliability of the compressor 1 and the overall efficiency of the air-conditioning system.

[0114] According to some embodiments of the present invention, in a specific working mode, the step 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 ambient temperature and working parameters specifically includes: In the heating mode, when 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 ambient temperature and working parameters meet the opening condition of the oil outlet pump 61, the oil outlet pump 61 is controlled to open.

[0115] Among them, the opening condition of the oil outlet pump 61 includes any one of the following conditions: 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 second 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 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 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 fourth set frequency.

[0116] 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.

[0117] 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 operating state of the compressor 1, it is determined whether to turn on the oil pump 61.

[0118] Among them, as the outdoor ambient temperature decreases, the compressor 1 requires a longer static time and a higher starting frequency to turn on the oil pump 61. As the outdoor ambient temperature decreases, the conditions for turning on the oil pump 61 become more stringent to ensure that the scroll disk 2 obtains enough oil under low-temperature conditions.

[0119] In this way, by intelligently controlling the turning on of the oil pump 61 according to the outdoor ambient temperature and the operating state of the compressor 1, it is ensured that there is enough oil in the scroll disk 2 after low-temperature startup or defrosting, reducing the wear of the scroll disk 2 and improving the reliability of the compressor 1.

[0120] Moreover, when no additional oil is required, the oil pump 61 will not turn on, reducing unnecessary energy consumption. In addition, reducing the wear of the scroll disk 2 can reduce maintenance requirements and improve the stability of the air-conditioning system and user satisfaction.

[0121] 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.

[0122] The third set duration is 30 minutes, the fourth set duration is 20 minutes, and the fifth set duration is 10 minutes.

[0123] 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.

[0124] According to some embodiments of the present invention, the step of controlling and adjusting the operating state of the oil inlet valve 41 and / or the oil pump 61 according to at least one of the outdoor ambient temperature and the operating parameters specifically includes: In the heating mode, when the outdoor ambient temperature and the operating parameters meet the closing conditions of the oil pump 61, the oil pump 61 is controlled to close.

[0125] Among them, the closing conditions of the oil pump 61 include any one of the following conditions: After the air conditioner operates in the defrosting mode or the oil return mode is completed, the compressor 1 increases its frequency to the target operating frequency, and at this time, the oil pump 61 is controlled to close after a delay of the sixth set 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 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 sixth 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 seventh set frequency.

[0126] 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.

[0127] In this embodiment, it can be understood that when the air conditioner operates in the defrosting mode or the oil return mode is completed, the compressor 1 increases its frequency to the target operating frequency, and the oil pump 61 will be closed after a delay of the sixth set duration. As the outdoor ambient temperature decreases, the compressor 1 requires a longer static time and a higher startup frequency to close the oil pump 61. As the outdoor ambient temperature decreases, the conditions for closing the oil pump 61 become more stringent to ensure that the scroll disk 2 obtains sufficient oil volume under low temperature conditions.

[0128] In this way, by intelligently controlling the closing of the oil pump 61 according to the outdoor ambient temperature and the working state of the compressor 1, it is ensured that the scroll disk 2 has sufficient oil volume after starting at low temperature or defrosting, reducing the wear of the scroll disk 2 and improving the reliability of the compressor 1. At the same time, when no additional oil volume is required, the oil pump 61 is closed in a timely manner, reducing unnecessary energy consumption.

[0129] For example, it is assumed 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.

[0130] The third set duration is 30 minutes, the fourth set duration is 20 minutes, and the fifth set duration is 10 minutes.

[0131] 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.

[0132] According to some embodiments of the present invention, the control logic for the opening and closing of the heating device is introduced as follows.

[0133] The opening conditions of the heating device include: Condition 1: The inlet valve 41 has been opened, which means that there is already 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.

[0134] The conditions for turning off the electric heating of the oil storage container 5 include: Condition 1: After the oil pump 61 is turned off, 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 pose a safety hazard. 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.

[0135] The specific working principle is as follows: When the inlet valve 41 is opened and the 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 turned off, 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.

[0136] 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 on / off 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.

[0137] 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, its frequency gradually increases.

[0138] When the frequency of the compressor 1 reaches a certain value, the 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.

[0139] Once the oil pump 61 is turned off, it indicates that the oil in the oil storage container 5 has been pumped out, and the heating device is immediately turned off. If the temperature in the oil storage container 5 reaches or exceeds the set value (such as reaching the saturation temperature corresponding to the suction pressure of the air conditioning system plus 10°C), the heating device will also automatically turn off.

[0140] As Figure 6 shown, the control device of the air conditioner 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 conditioner; A control module 120, configured to control and adjust the working state of the inlet valve 41 and / or the oil pump 61 according to at least one of the outdoor ambient temperature and the working parameters in a specific working mode.

[0141] Figure 7 Illustrates a schematic physical structure diagram of an electronic device, such asFigure 7 As shown, the electronic device may include: a processor 810, a communications interface 820, a memory 830, and a communication bus 840. Among them, the processor 810, the communications interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logical instructions in the memory 830 to execute the control method of the air conditioner, including: obtaining the working mode, outdoor ambient temperature, and working parameters of the air conditioner; and controlling and adjusting the working states 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 in a specific working mode.

[0142] In addition, when the logical instructions in the above-mentioned memory 830 are implemented in the form of software functional units and sold or used as independent products, they may 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, may 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. 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.

[0143] On the other hand, the present invention also provides a computer program product. The computer program product 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 conditioner provided by the above-mentioned various methods, including: obtaining the working mode, outdoor ambient temperature, and working parameters of the air conditioner; and controlling and adjusting the working states 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 in a specific working mode.

[0144] On 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 conditioner provided by the above-mentioned various methods, including: obtaining the working mode, outdoor ambient temperature, and working parameters of the air conditioner; and controlling and adjusting the working states 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 in a specific working mode.

[0145] 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. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0146] 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 this understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0147] 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. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air conditioner, characterized in that, Comprising: A compressor and a suction pipe. The compressor has a suction port. One side of the suction port communicates with the scroll plate inside the compressor, and the other side is connected to the suction pipe located outside the compressor. An oil storage and replenishment device, including an oil inlet pipe, an oil storage container, and an oil outlet pipe connected in sequence. The inlet of the oil inlet pipe and the outlet of the oil outlet pipe are both communicated with the suction pipe, and in the refrigerant flow direction, the inlet of the oil inlet pipe is located upstream of the outlet of the oil outlet pipe. 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 conditioner according to claim 1, characterized in that, The suction pipe has a horizontal section and a vertical section. The horizontal section is arranged downstream of the vertical section in 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 conditioner according to claim 2, characterized in that, 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, and a first gas passing gap is left between the first oil baffle and the upper inner wall of the horizontal section. And / or, two symmetrically arranged second oil baffles are formed on both sides of the outlet of the oil outlet pipe. The second oil baffles at least partially cover the cross-section of the horizontal section perpendicular to the central axis, and a second gas passing gap is left between the second oil baffles and the upper inner wall of the horizontal section.

4. The air conditioner according to claim 2, characterized in that, The inlet of the oil outlet pipe is located at the bottom of the oil storage container, and the outlet of the oil inlet pipe is located at the top of the oil storage container. Preferably, a capillary part is formed on the oil outlet pipe.

5. The air conditioner 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. A control method for an air conditioner according to any one of claims 1 to 5, characterized in that, Comprising: Obtaining the working mode, outdoor ambient temperature, and working parameters of the air conditioner. In a specific working mode, 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.

7. The control method of the air conditioner according to claim 6, characterized in that, 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 frequency of the compressor is greater than a first set frequency and lasts for at least a first set duration, then control the oil inlet valve to open. If it is determined that the air conditioner 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 conditioner is in the defrosting mode or the oil return mode, control the oil inlet valve to remain in the closed state.

8. The control method of the air conditioner according to claim 6, characterized in that, 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, when 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, control the oil outlet pump to open; Wherein, 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; 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.

9. The control method of the air conditioner according to claim 8, characterized in that, 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, when the outdoor environmental temperature and the working parameters meet the oil outlet pump closing condition, control the oil outlet pump to close; Wherein, the oil outlet pump closing condition includes any one of the following conditions: After the air conditioner runs the defrosting mode or the oil return mode 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 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 fifth 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 sixth 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 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.

10. A control device for an air conditioner according to any one of claims 1 to 5, characterized in that, Including: An acquisition module for acquiring the working mode, outdoor environmental temperature and working parameters of the air conditioner; 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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