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 according to the first embodiment of the invention comprises a compressor, a four-way valve, a condenser, a throttle valve and an evaporator which are connected through a refrigerant pipeline, wherein a liquid separator is arranged at an inlet of the evaporator, the evaporator comprises a plurality of evaporation coils, the liquid separator is respectively communicated with the evaporation coils through a plurality of liquid separation pipes, and the liquid separation pipes and the evaporation coils are equal in number and are in one-to-one correspondence; the liquid separator is further communicated with an exhaust pipe, an outlet of the exhaust pipe is communicated to an air suction port of the compressor, and an electromagnetic valve is arranged on the exhaust pipe. According to the air conditioning system and the control method and device thereof, the exhaust pipe is additionally arranged in the liquid separator, so that gas in the liquid separator is completely exhausted through the exhaust pipe, and liquid separation does not need to be debugged; and the liquid refrigerant in the liquid separator can be prevented from entering the compressor to be hydraulically compressed by controlling the on-off of the exhaust pipe in the liquid separator.

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 and a control device thereof. Background Art

[0002] In the related art, the heat exchange capacity of the evaporator seriously affects the comprehensive performance of the air conditioner. Currently, most common evaporators are provided with multiple groups of heat exchange coils. The distributor is arranged on the upstream side of the evaporator. The gas-liquid mixed refrigerant inside needs to be evenly distributed by the distributor into the multiple groups of heat exchange coils through the distribution pipes. Otherwise, it will affect the circulation speed of the refrigerant and further affect the heat exchange performance of the evaporator. When the gas-liquid mixed refrigerant in the distributor is unevenly distributed, some heat exchange coils will cause frosting of the evaporator due to excessive refrigerant, while in some other heat exchange coils, there is only less refrigerant, which will also cause the heat transfer area of the evaporator not to be well utilized, thus seriously affecting the heat exchange capacity of the evaporator. Therefore, the performance of the distributor will greatly affect the heat exchange capacity of the evaporator and even affect the heat exchange capacity of the entire air conditioner. Summary of the Invention

[0003] The present invention provides an air-conditioning system, a control method and a control device thereof to solve the defects existing in the prior art and achieve the following technical effects: by adding an exhaust pipe in the distributor, all the gas in the distributor can be exhausted through the exhaust pipe, and there is no need to debug the liquid distribution; and by controlling the on-off of the exhaust pipe in the distributor, the liquid refrigerant in the distributor can be prevented from entering the compressor for liquid compression.

[0004] The air-conditioning system according to the first aspect embodiment of the present invention includes: a compressor, a four-way valve, a condenser, a throttle valve and an evaporator connected through a refrigerant pipeline; wherein, a distributor is provided at the inlet of the evaporator. The evaporator includes a plurality of evaporation coils. The distributor is respectively communicated with the plurality of evaporation coils through a plurality of distribution pipes. The number of the distribution pipes is equal to and corresponds one by one to the number of the evaporation coils. The distributor is also communicated with an exhaust pipe. The outlet of the exhaust pipe is communicated with the suction port of the compressor, and a solenoid valve is provided on the exhaust pipe.

[0005] According to an embodiment of the present invention, the distributor has an inlet end and an outlet end, and the inner diameter of the distributor gradually increases from the inlet end to the outlet end.

[0006] According to an embodiment of the present invention, both the distribution pipe and the exhaust pipe are communicated with the outlet end, and the distribution pipe extends below the liquid level of the distributor, and the exhaust pipe is arranged at the top of the outlet end.

[0007] According to an embodiment of the present invention, the air-conditioning system further includes: a detection device disposed in the liquid distributor and configured to detect the liquid level height of the liquid distributor; a control device respectively connected to the detection device and the solenoid valve, the control device being configured to obtain the liquid level height of the liquid distributor according to the detection result of the detection device, and control and adjust the opening degree of the solenoid valve according to the liquid level height.

[0008] A control method for an air-conditioning system according to an embodiment of the second aspect of the present invention based on the air-conditioning system according to the embodiment of the first aspect of the present invention includes: obtaining the actual liquid level height of the refrigerant in the liquid distributor; controlling and adjusting the opening degree of the solenoid valve according to the actual liquid level height.

[0009] According to an embodiment of the present invention, before the step of controlling and adjusting the opening degree of the solenoid valve according to the actual liquid level height, it further includes: obtaining the minimum liquid level height and the maximum liquid level height of the refrigerant in the liquid distributor; then the step of controlling and adjusting the opening degree of the solenoid valve according to the actual liquid level height specifically includes: controlling and adjusting the opening degree of the solenoid valve according to the comparison results between the actual liquid level height and the minimum liquid level height and the maximum liquid level height respectively.

[0010] According to an embodiment of the present invention, the step of controlling and adjusting the opening degree of the solenoid valve according to the comparison results between the actual liquid level height and the minimum liquid level height and the maximum liquid level height respectively specifically includes: when the actual liquid level height is equal to the maximum liquid level height, controlling the solenoid valve to be in a closed state.

[0011] According to an embodiment of the present invention, the step of controlling and adjusting the opening degree of the solenoid valve according to the comparison results between the actual liquid level height and the minimum liquid level height and the maximum liquid level height respectively specifically includes: when the actual liquid level height is greater than the minimum liquid level height and less than the maximum liquid level height, controlling the solenoid valve to be in an open state.

[0012] According to an embodiment of the present invention, when the actual liquid level height is greater than the minimum liquid level height and less than the maximum liquid level height, the step of controlling the solenoid valve to be in an open state specifically includes: calculating the liquid level difference between the actual liquid level height and the maximum liquid level height; determining the initial opening degree of the solenoid valve according to the liquid level difference, and controlling the solenoid valve to open and reach the initial opening degree, wherein the initial opening degree is positively correlated with the liquid level difference.

[0013] According to an embodiment of the present invention, the method for obtaining the lowest liquid level height is as follows: obtain the highest liquid level height of the liquid distributor and the insertion depth of the liquid distribution pipe in the liquid distributor; calculate the lowest liquid level height according to the highest liquid level height and the insertion depth, where the lowest liquid level height is equal to the difference between the highest liquid level height and the insertion depth.

[0014] According to an embodiment of the present invention, the control method of the air-conditioning system further includes: controlling and adjusting the opening degree of the throttle valve of the air-conditioning system according to the actual liquid level height.

[0015] The control device of the air-conditioning system according to the first aspect embodiment of the present invention according to the third aspect embodiment of the present invention includes: an acquisition module for acquiring the actual liquid level height of the refrigerant in the liquid distributor; a control module for controlling and adjusting the opening degree of the electromagnetic valve according to the actual liquid level height.

[0016] The present invention provides an air-conditioning system. By adding an exhaust pipe in the liquid distributor, all the gas in the liquid distributor is exhausted through the exhaust pipe, resulting in no gaseous refrigerant in the liquid distributor and all being liquid refrigerant. Therefore, it is not necessary to consider the uneven distribution of gas-liquid refrigerant in the liquid distributor, and there is no need to debug the liquid distribution; and by controlling the on-off of the exhaust pipe in the liquid distributor, it is possible to prevent the liquid refrigerant in the liquid distributor from entering the compressor for liquid compression.

[0017] Furthermore, the air-conditioning system of the present invention has the following advantages compared with the background technology.

[0018] (1) Precise refrigerant distribution: The liquid distributor evenly distributes the refrigerant to each evaporation coil of the evaporator through a plurality of liquid distribution pipes, ensuring the uniform flow and evaporation of the refrigerant and improving the heat exchange efficiency.

[0019] (2) Avoid local overcooling or overheating: Since the liquid distribution pipes and the evaporation coils are in one-to-one correspondence, it is possible to avoid local overcooling or overheating caused by uneven refrigerant distribution, thereby improving the comfort and energy efficiency of the air conditioner.

[0020] (3) Reduce frosting phenomenon: The uniform refrigerant distribution reduces the frosting phenomenon caused by the concentration of the refrigerant, extends the service life of the air-conditioning system and reduces the maintenance cost.

[0021] (4) Improve the response speed of the system: By setting an exhaust pipe on the liquid distributor and connecting it to the suction port of the compressor, the pressure change in the system can be responded to faster, improving the dynamic performance of the system.

[0022] (5) Intelligent control: An electromagnetic valve is provided on the exhaust pipe, which can perform intelligent control according to the actual needs of the system. For example, when it detects that there is too much gaseous refrigerant in the liquid separator, the electromagnetic valve can be automatically opened for exhaust to prevent the compressor from inhaling too much gaseous refrigerant.

[0023] (6) Preventing compressor damage: By controlling the opening and closing of the electromagnetic valve, it can effectively prevent liquid refrigerant from directly entering the compressor, reduce the risk of liquid compression, and protect the compressor from damage. Description of the Drawings

[0024] 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 described below 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.

[0025] Figure 1 It is a schematic structural diagram of the air-conditioning system provided by the present invention.

[0026] Figure 2 It is a schematic flow diagram of the control method of the air-conditioning system provided by the present invention.

[0027] Figure 3 It is a schematic structural diagram of the control device of the air-conditioning system provided by the present invention.

[0028] Figure 4 It is a schematic structural diagram of the electronic device provided by the present invention.

[0029] Description of the reference numerals: 1. Compressor; 2. Four-way valve; 3. Condenser; 4. Throttle valve; 5. Evaporator; 51. Evaporator coil; 6. Refrigerant pipe; 7. Liquid separator; 8. Evaporation joint; 9. Detection device; 10. Electromagnetic valve; 11. Exhaust pipe; 12. Liquid separation pipe; 110. Acquisition module; 120. Control module. Detailed Embodiments

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0031] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0032] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0033] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean 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 descriptions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0034] Next, a description will be given of an air conditioning system, a control method and a control device for the air conditioning system according to the present invention with reference to the accompanying drawings.

[0035] As Figure 1 shown, the air conditioning system according to the first aspect embodiment of the present invention includes a compressor 1, a four-way valve 2, a condenser 3, a throttle valve 4, an evaporator 5, and a liquid distributor 7.

[0036] The compressor 1, the four-way valve 2, the condenser 3, the throttle valve 4, and the evaporator 5 are connected through a refrigerant pipeline 6; wherein, a liquid distributor 7 is provided at the inlet of the evaporator 5, the evaporator 5 includes a plurality of evaporation coils 51, and the liquid distributor 7 is respectively communicated with the plurality of evaporation coils 51 through a plurality of liquid distribution pipes 12, and the number of the liquid distribution pipes 12 and the evaporation coils 51 is equal and one-to-one corresponding.

[0037] The liquid distributor 7 is also connected to an exhaust pipe 11, and the outlet of the exhaust pipe 11 is connected to the suction port of the compressor 1. An electromagnetic valve 10 is provided on the exhaust pipe 11.

[0038] It can be understood that in the liquid distribution structure of this air conditioning system, the liquid distributor 7 is responsible for evenly distributing the liquid refrigerant into each evaporation coil 51. The liquid distribution pipe 12 is used to connect the liquid distributor 7 and the evaporation coil 51 to ensure the even distribution of the refrigerant. The exhaust pipe 11 can ensure the discharge of the gas in the liquid distributor 7 to prevent the gaseous refrigerant from affecting the liquid distribution effect. The electromagnetic valve 10 is used to control the opening and closing of the exhaust pipe 11 and regulate the discharge of the gas in the liquid distributor 7.

[0039] In the air conditioning system according to the embodiment of the present invention, its specific working principle and working process are as follows: The liquid refrigerant enters the liquid distributor 7 and is evenly distributed into each evaporation coil 51 through the liquid distribution pipe 12. There may be gaseous refrigerant at the top of the liquid distributor 7, and this part of the gaseous refrigerant needs to be discharged through the exhaust pipe 11. An electromagnetic valve 10 is provided on the exhaust pipe 11, which can be opened or closed as needed to control the discharge of the gaseous refrigerant. A liquid level sensor can be installed inside the liquid distributor 7 to monitor the liquid level height in the liquid distributor 7 in real time.

[0040] Among them, if the liquid level sensor detects that the liquid level height reaches the set minimum liquid level requirement, the electromagnetic valve 10 closes to prevent the liquid refrigerant from entering the compressor 1 and causing liquid compression. If the liquid level height is lower than the minimum requirement, the electromagnetic valve 10 opens to allow the gaseous refrigerant to enter the suction port of the compressor 1 through the exhaust pipe 11, thereby preventing the gaseous refrigerant from accumulating in the liquid distributor 7.

[0041] In the related art, the heat exchange capacity of the evaporator seriously affects the comprehensive performance of the air conditioner. Currently, most common evaporators are provided with multiple groups of heat exchange coils. The liquid distributor is arranged on the upstream side of the evaporator, and the gas-liquid mixed refrigerant inside needs to be evenly distributed by the liquid distributor and enter the multiple groups of heat exchange coils through the liquid distribution pipes. Otherwise, it will affect the circulation speed of the refrigerant and further affect the heat exchange performance of the evaporator. When the gas-liquid mixed refrigerant in the liquid distributor is unevenly distributed, some heat exchange coils will cause frosting of the evaporator due to excessive refrigerant, while in some other heat exchange coils, there is only less refrigerant, which will also cause the heat transfer area of the evaporator not to be well utilized, thus seriously affecting the heat exchange capacity of the evaporator. Therefore, the performance of the liquid distributor will greatly affect the heat exchange capacity of the evaporator and even affect the heat exchange capacity of the entire air conditioner.

[0042] Therefore, to solve the technical defects existing in the above-mentioned related technologies, the present invention provides an air conditioning system. By adding an exhaust pipe 11 in the liquid distributor 7, all the gas in the liquid distributor 7 is exhausted through the exhaust pipe 11, resulting in no gaseous refrigerant in the liquid distributor 7 and all being liquid refrigerant. Thus, the situation of uneven distribution of gas-liquid refrigerant in the liquid distributor 7 does not need to be considered, and there is no need to debug the liquid distribution. Moreover, by controlling the on-off of the exhaust pipe 11 in the liquid distributor 7, the entry of liquid refrigerant in the liquid distributor 7 into the compressor 1 for liquid compression can be avoided.

[0043] Furthermore, the air conditioning system of the present invention has the following advantages compared with the background technology.

[0044] (1) Precise refrigerant distribution: The liquid distributor 7 evenly distributes the refrigerant to each evaporation coil 51 of the evaporator 5 through a plurality of liquid distribution pipes 12, ensuring the uniform flow and evaporation of the refrigerant and improving the heat exchange efficiency.

[0045] (2) Avoid local overcooling or overheating: Since the liquid distribution pipes 12 and the evaporation coils 51 are in one-to-one correspondence, local overcooling or overheating caused by uneven refrigerant distribution can be avoided, thereby improving the comfort and energy efficiency of the air conditioner.

[0046] (3) Reduce frosting phenomenon: The uniform refrigerant distribution reduces the frosting phenomenon caused by the concentration of the refrigerant, prolongs the service life of the air conditioning system and reduces the maintenance cost.

[0047] (4) Improve the response speed of the system: By setting an exhaust pipe 11 on the liquid distributor 7 and connecting it to the suction port of the compressor 1, the system can respond more quickly to the pressure changes within the system and improve the dynamic performance of the system.

[0048] (5) Intelligent control: An electromagnetic valve 10 is provided on the exhaust pipe 11, which can be intelligently controlled according to the actual needs of the system. For example, when it is detected that the amount of gaseous refrigerant in the liquid distributor 7 is excessive, the electromagnetic valve 10 can be automatically opened for exhaust to avoid the compressor 1 from inhaling too much gaseous refrigerant.

[0049] (6) Prevent damage to the compressor 1: By controlling the opening and closing of the electromagnetic valve 10, the direct entry of liquid refrigerant into the compressor 1 can be effectively prevented, reducing the risk of liquid compression and protecting the compressor 1 from damage.

[0050] As Figure 1 shown, according to some embodiments of the present invention, the liquid distributor 7 has an inlet end and an outlet end, and the inner diameter of the liquid distributor 7 gradually increases from the inlet end to the outlet end.

[0051] It should be explained that the design of the gradually increasing inner diameter of the liquid distributor 7 is to utilize the principle of fluid dynamics. As the fluid (refrigerant) flows through the liquid distributor 7, the gradually increasing inner diameter helps to reduce the flow rate, reduce turbulence, and thus reduce energy loss.

[0052] It can be understood that as the inner diameter increases, the flow rate of the fluid slows down, which helps to reduce the dynamic pressure of the fluid, making the pressure drop smoother and facilitating the more stable inflow of the refrigerant into the liquid distribution pipe 12. In addition, the gradually increasing inner diameter may help to improve the gas-liquid mixing state, because the reduction in flow rate can reduce the possibility of gas-liquid separation, thereby improving the uniformity of liquid distribution.

[0053] In this way, on the one hand, the design of the gradually increasing inner diameter helps the refrigerant to be more evenly distributed to each liquid distribution pipe 12 inside the liquid separator 7, thereby improving the heat exchange efficiency of the evaporator 5; on the other hand, by reducing the energy loss caused by turbulence or high-speed flow, this design can reduce the energy consumption of the system and improve the energy efficiency ratio of the air-conditioning system. In addition, the reduction in flow rate helps to reduce the noise and vibration caused by fluid flow, enhancing the user experience.

[0054] As Figure 1 shown, according to some embodiments of the present invention, the liquid distribution pipe 12 and the exhaust pipe 11 are both connected to the outlet end, and the liquid distribution pipe 12 extends below the liquid level of the liquid separator 7, and the exhaust pipe 11 is provided at the top of the outlet end.

[0055] In this embodiment, both the liquid distribution pipe 12 and the exhaust pipe 11 are connected to the outlet end of the liquid separator 7, that is, the processes of liquid distribution and exhaust are both concentrated in the outlet area of the liquid separator 7, which helps to more effectively control the flow direction of the refrigerant and the exhaust process. Among them, the liquid distribution pipe 12 extends below the liquid level of the liquid separator 7, which can ensure that the liquid distribution pipe 12 can directly suck the liquid refrigerant from below the liquid level, helping to reduce the mixing of gaseous refrigerant, thereby improving the accuracy and efficiency of liquid distribution. And the exhaust pipe 11 is provided at the top of the outlet end, which allows the gaseous refrigerant to rise to the top inside the liquid separator 7 and then be discharged, avoiding the mixing of gaseous refrigerant and liquid refrigerant into the liquid distribution pipe 12 and ensuring the purity of liquid distribution.

[0056] In this way, the liquid distribution pipe 12 extending below the liquid level can more effectively suck the liquid refrigerant, reducing the interference of gaseous refrigerant and improving the efficiency of liquid distribution. And the exhaust pipe 11 is located at the top of the liquid separator 7, which helps to discharge the gaseous refrigerant accumulated at the top, avoiding the gaseous refrigerant from entering the evaporation coil 51 and affecting the performance of the air-conditioning system.

[0057] As Figure 1 shown, according to some embodiments of the present invention, the evaporator 5 further includes an evaporation joint 8, and the outlets of several evaporation coils 51 are commonly connected to the evaporation joint 8.

[0058] As Figure 1 shown, according to some embodiments of the present invention, the air-conditioning system further includes a detection device 9 and a control device.

[0059] The detection device 9 is arranged inside the liquid distributor 7 and is used to detect the liquid level height of the liquid distributor 7; the control device is respectively connected to the detection device 9 and the solenoid valve 10. The control device is used to obtain the liquid level height of the liquid distributor 7 according to the detection result of the detection device 9, and control and adjust the opening degree of the solenoid valve 10 according to the liquid level height.

[0060] Among them, the detection device 9 is specifically used to monitor the liquid level height in the liquid distributor 7 in real time. For example, a liquid level sensor can accurately measure the liquid level and convert it into an electrical signal.

[0061] The control device receives the signal from the detection device 9 and controls the opening degree of the solenoid valve 10 according to the real-time data of the liquid level height. That is to say, the control device can dynamically adjust the opening and closing degree of the solenoid valve 10 according to the actual needs of the system to optimize the system performance.

[0062] Its working principle is as follows: The detection device 9 continuously monitors the liquid level height in the liquid distributor 7 and transmits the data to the control device. The control device analyzes the liquid level data to determine whether it is necessary to adjust the opening degree of the solenoid valve 10. According to the liquid level height, the control device adjusts the opening degree of the solenoid valve 10 to keep the liquid level in the liquid distributor 7 in the best state.

[0063] In this way, through real-time monitoring and intelligent control, the system can ensure that the liquid level in the liquid distributor 7 is maintained at the best level, improving the uniformity and accuracy of liquid distribution. In addition, the intelligent control of the solenoid valve 10 can prevent excessive liquid refrigerant from flowing into the compressor 1, thus avoiding liquid compression and damage to the compressor 1.

[0064] The control method and control device of the air-conditioning system proposed by the present invention will be described below with reference to the accompanying drawings. Among them, before describing 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 in 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, the third-party devices may include various different types such as mobile phones, tablets, notebooks, in-vehicle computers and other intelligent terminals.

[0065] Hereinafter, 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.

[0066] As Figure 2 shown, according to the control method of the air-conditioning system in the second aspect embodiment of the present invention, it includes: Step S1, obtaining the actual liquid level height of the refrigerant in the liquid distributor 7; Step S2, controlling and adjusting the opening degree of the solenoid valve 10 according to the actual liquid level height.

[0067] The control method of the air conditioning system according to the embodiments of the present invention has the following specific working process: The detection device 9 (such as a liquid level sensor) installed in the liquid distributor 7 is used to monitor and obtain the liquid level height of the refrigerant in the liquid distributor 7 in real time. The liquid level sensor converts the liquid level height into an electrical signal and transmits the signal to the control device. After receiving the liquid level height signal transmitted by the liquid level sensor, the control device determines whether the current liquid level is within the ideal range according to the preset control logic or algorithm.

[0068] For example, if the liquid level height is within the ideal range, the control device will maintain the current opening degree of the solenoid valve 10 to keep the liquid level in the liquid distributor 7 stable. If the liquid level height is lower than the ideal range, the control device will increase the opening degree of the solenoid valve 10 to allow more gaseous refrigerant to be discharged, so as to reduce the amount of liquid refrigerant in the liquid distributor 7 until the liquid level returns to the ideal range. If the liquid level height is higher than the ideal range, the control device will reduce the opening degree of the solenoid valve 10 to limit the discharge amount of gaseous refrigerant, so as to increase the amount of liquid refrigerant in the liquid distributor 7 until the liquid level drops to the ideal range.

[0069] In summary, the control method of the air conditioning system according to the embodiments of the present invention ensures that the liquid level height in the liquid distributor 7 always remains in the best state through real-time monitoring and adjustment, improving the response speed and control accuracy of the system.

[0070] At the same time, by maintaining the ideal liquid level height, the refrigeration or heating performance of the air conditioning system can be optimized, and the energy efficiency ratio can be improved. By intelligently controlling the opening degree of the solenoid valve 10, the excessive inflow of liquid refrigerant into the compressor 1 can be avoided, reducing the risk of liquid compression.

[0071] In addition, the automated control method reduces human intervention and reduces the system instability caused by improper operation. And through precise control, unnecessary refrigerant flow and pressure loss are reduced, the energy consumption of the system is reduced, and by avoiding liquid compression and reducing equipment wear, the service life of the air conditioning system and its components is extended.

[0072] According to some embodiments of the present invention, before the step of controlling and adjusting the opening degree of the solenoid valve 10 according to the actual liquid level height, it further includes: obtaining the lowest liquid level height and the highest liquid level height of the refrigerant in the liquid distributor 7.

[0073] Then the step of controlling and adjusting the opening degree of the solenoid valve 10 according to the actual liquid level height specifically includes: controlling and adjusting the opening degree of the solenoid valve 10 according to the comparison results between the actual liquid level height and the lowest liquid level height and the highest liquid level height respectively.

[0074] In this embodiment, it is first necessary to determine the lowest liquid level height and the highest liquid level height of the refrigerant in the liquid distributor 7. These two thresholds are necessary for the normal operation of the system and are usually preset based on system design and operation requirements.

[0075] The detection device 9 (such as a liquid level sensor) is used to monitor and obtain the actual liquid level height of the refrigerant in the liquid distributor 7 in real time. The control device compares the obtained actual liquid level height with the minimum liquid level height and the maximum liquid level height. According to the comparison result, the control device adjusts the opening degree of the solenoid valve 10, so as to maintain the actual liquid level height within the optimal liquid level height range.

[0076] In this way, by setting the minimum and maximum liquid level heights, the system can avoid potential risks caused by too low or too high liquid levels. At the same time, the preset liquid level height threshold provides a clear control target, making the adjustment of the solenoid valve 10 more accurate and reliable. And, by maintaining the liquid level within the optimal range, the system can maintain the best performance, whether for refrigeration or heating.

[0077] In some specific embodiments of the present invention, the step of controlling and adjusting the opening degree of the solenoid valve 10 according to the comparison results between the actual liquid level height and the minimum liquid level height and the maximum liquid level height respectively specifically includes: when the actual liquid level height is equal to the maximum liquid level height, controlling the solenoid valve 10 to be in a closed state.

[0078] In this embodiment, the monitored actual liquid level height is compared with the preset minimum liquid level height and maximum liquid level height. When the actual liquid level height is equal to the maximum liquid level height, the control device will perform the following operations: control the solenoid valve 10 to be in a closed state to prevent more gaseous refrigerant from being discharged from the liquid distributor 7.

[0079] In this way, on the one hand, by closing the solenoid valve 10 when the liquid level reaches the highest point, it is possible to prevent the refrigerant from overflowing from the liquid distributor 7 and avoid possible damage to the system; on the other hand, closing the solenoid valve 10 when the liquid level reaches the maximum liquid level height helps to maintain the pressure balance inside the system and prevent system failures caused by too high pressure.

[0080] In addition, closing the solenoid valve 10 can prevent too much liquid refrigerant from flowing into the compressor 1, thereby avoiding damage to the compressor 1 due to overload. And, by precisely controlling the opening and closing of the solenoid valve 10, the system can operate more stably, reduce performance fluctuations caused by liquid level fluctuations, and, by avoiding potential damage caused by too high liquid levels, help to extend the service life of the air conditioning system and its components.

[0081] In other embodiments of the present invention, the step of controlling and adjusting the opening degree of the solenoid valve 10 according to the comparison results between the actual liquid level height and the minimum liquid level height and the maximum liquid level height respectively specifically includes: when the actual liquid level height is greater than the minimum liquid level height and less than the maximum liquid level height, controlling the solenoid valve 10 to be in an open state.

[0082] In this embodiment, when the actual liquid level height is greater than the minimum liquid level height and less than the maximum liquid level height, the control device will perform the following operations: control the solenoid valve 10 to be in the open state, but the opening degree may be adjusted according to the distance between the actual liquid level height and the minimum and maximum liquid level heights.

[0083] Among them, if the actual liquid level height is close to the minimum liquid level height, the solenoid valve 10 will open with a smaller opening degree to slowly increase the amount of liquid refrigerant and prevent the liquid level from dropping to an unsafe area; if the actual liquid level height is close to the maximum liquid level height, the solenoid valve 10 will open with a larger but safe opening degree to discharge the excess gaseous refrigerant and prevent the liquid level from rising further.

[0084] In this way, on the one hand, by opening the solenoid valve 10, the system can maintain the liquid level within a safe and effective operating range. On the other hand, ensuring that the liquid level remains in the optimal working range helps the air-conditioning system to operate at the highest efficiency.

[0085] In addition, it avoids insufficient suction of the compressor 1 caused by too low a liquid level or liquid compression caused by too high a liquid level. At the same time, by precisely controlling the opening degree of the solenoid valve 10, the energy consumption of the refrigerant flow is reduced, and the overall energy efficiency of the system is improved. Moreover, the system can automatically adjust according to the change of the actual liquid level height to adapt to different working conditions.

[0086] Further, in the case where the actual liquid level height is greater than the minimum liquid level height and less than the maximum liquid level height, the step of controlling the solenoid valve 10 to be in the open state specifically includes: calculating the liquid level difference between the actual liquid level height and the maximum liquid level height; determining the initial opening degree of the solenoid valve 10 according to the liquid level difference, and controlling the solenoid valve 10 to open and reach the initial opening degree, where the initial opening degree is positively correlated with the liquid level difference.

[0087] In this embodiment, when the actual liquid level height is lower than the maximum liquid level height, the system calculates the difference between the two, that is, the liquid level difference = the maximum liquid level height - the actual liquid level height.

[0088] Among them, the system determines the initial opening degree of the solenoid valve 10 according to the liquid level difference. There is a positive correlation here, that is, the larger the liquid level difference, the lower the actual liquid level, and the larger the initial opening degree of the solenoid valve 10 is set to allow more gaseous refrigerant to be discharged, thereby increasing the amount of liquid refrigerant; conversely, the smaller the liquid level difference, the closer the actual liquid level is to the maximum liquid level, and the smaller the initial opening degree of the solenoid valve 10 is set.

[0089] After that, the control device controls the solenoid valve 10 to open to the corresponding position according to the calculated initial opening degree signal to adjust the discharge amount of the gaseous refrigerant.

[0090] Meanwhile, with the opening of the solenoid valve 10, the system continues to monitor the change in the liquid level height. If the liquid level height continues to rise and approaches the maximum liquid level height, the control system will gradually reduce the opening degree of the solenoid valve 10 to avoid excessive liquid level.

[0091] It can be understood that the goal of the system is to maintain the liquid level within an optimal working range and respond to the real-time change of the liquid level by dynamically adjusting the opening degree of the solenoid valve 10. The entire control process is a closed-loop feedback system. The liquid level sensor provides real-time feedback, and the control device processes and adjusts the solenoid valve 10 to form a continuous control cycle.

[0092] In this way, the advantage of this embodiment is that it can achieve precise control of the refrigerant liquid level, ensuring that the air-conditioning system can maintain efficient and stable performance under various operating conditions. At the same time, by dynamically adjusting the opening degree of the solenoid valve 10, the system can adapt to different operating loads and environmental changes, improve energy efficiency and reduce energy waste.

[0093] According to some embodiments of the present invention, the method for obtaining the minimum liquid level height is as follows: obtain the maximum liquid level height of the liquid distributor 7 and the insertion depth of the liquid distribution pipe 12 in the liquid distributor 7; calculate the minimum liquid level height according to the maximum liquid level height and the insertion depth, wherein the minimum liquid level height is equal to the difference between the maximum liquid level height and the insertion depth.

[0094] It can be understood that the specific calculation method of the minimum liquid level height is as follows: First, determine the maximum liquid level height of the liquid distributor 7. This height is the maximum liquid level that the liquid distributor 7 is allowed to reach during normal operation to avoid refrigerant overflow or other potential problems. Measure the insertion depth of the liquid distribution pipe 12 in the liquid distributor 7. This depth refers to the distance from the end of the liquid distribution pipe 12 to the bottom of the liquid distributor 7.

[0095] According to the maximum liquid level height and the insertion depth of the liquid distribution pipe 12, calculate the minimum liquid level height. The calculation formula is: Minimum liquid level height = Maximum liquid level height - Insertion depth Minimum liquid level height = Maximum liquid level height - Insertion depth.

[0096] The calculated result obtained is the minimum liquid level height of the liquid distributor 7, and this height is the minimum liquid level to ensure that the liquid distribution pipe 12 can normally suck in the liquid refrigerant.

[0097] It can be understood that the determination of the maximum liquid level height and the minimum liquid level height is to ensure that the liquid distributor 7 operates within a safe and effective operating range. The insertion depth of the liquid distribution pipe 12 determines the position where it can suck the refrigerant from the liquid distributor 7, which is crucial for ensuring uniform distribution of the refrigerant. By calculating the difference between the maximum liquid level height and the insertion depth, the minimum liquid level height can be obtained to ensure that the liquid distribution pipe 12 can still work normally when the liquid level is lower than the maximum liquid level.

[0098] In this way, the insertion heights of the liquid distribution pipes 12 of different liquid distributors 7 are set with different minimum liquid level requirements, thereby controlling the on-off of the exhaust pipe 11 of the liquid distributor 7, being applicable to different liquid distributors 7 and increasing their matching degree.

[0099] According to some embodiments of the present invention, the control method of the air-conditioning system further includes: controlling and adjusting the opening degree of the throttle valve 4 of the air-conditioning system according to the actual liquid level height.

[0100] In this embodiment, the specific working process is as follows: The liquid level sensor is used to monitor the refrigerant liquid level height in the liquid distributor 7 in real time to obtain the actual liquid level height data. The actual liquid level height is compared with the preset minimum liquid level height and maximum liquid level height to evaluate the current liquid level state of the system. According to the actual liquid level height, the control device adjusts the opening degree of the throttle valve 4 to affect the flow rate and pressure of the refrigerant, and further controls the operating state of the entire air-conditioning system.

[0101] When the actual liquid level height is lower than the preset minimum liquid level height, the control device will increase the opening degree of the throttle valve 4 to allow more refrigerant to flow into the evaporator 5 to enhance the refrigeration effect.

[0102] When the actual liquid level height is higher than the preset maximum liquid level height, the control device will reduce the opening degree of the throttle valve 4 to limit the refrigerant from flowing into the evaporator 5 to prevent system overload.

[0103] Suppose during the operation of an air-conditioning system, the liquid level sensor monitors that the actual liquid level height in the liquid distributor 7 is L1, while the preset minimum liquid level height of the system is Lmin and the maximum liquid level height is Lmax.

[0104] Case 1: If L1 < Lmin, it means the liquid level is too low, which may affect the heat exchange efficiency of the evaporator 5. The control system will increase the opening degree of the throttle valve 4 to increase the refrigerant flow rate and raise the liquid level to the safe range.

[0105] Case 2: If L1 is between Lmin and Lmax, the control system will dynamically adjust the opening degree of the throttle valve 4 according to the distance between the liquid level and Lmin and Lmax to keep the liquid level stable.

[0106] Case 3: If L1 > Lmax, it means the liquid level is too high, which may increase the risk of liquid compression of the compressor 1. The control system will reduce the opening degree of the throttle valve 4 to reduce the refrigerant flow rate and lower the liquid level to the safe range.

[0107] In this way, through the above steps, the air-conditioning system can intelligently adjust the opening degree of the throttle valve 4 according to the actual liquid level height, ensuring that the system can operate efficiently and stably under various working conditions, while improving energy efficiency and extending the equipment life.

[0108] Such as Figure 3As shown, the control device of the air-conditioning system according to the embodiment of the second aspect of the present invention includes: an acquisition module 110 for acquiring the actual liquid level height of the refrigerant in the liquid distributor 7; a control module 120 for controlling and adjusting the opening degree of the solenoid valve 10 according to the actual liquid level height.

[0109] Figure 4 An entity structure diagram of an electronic device is illustrated, such as Figure 4 As 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 actual liquid level height of the refrigerant in the liquid distributor 7; controlling and adjusting the opening degree of the solenoid valve 10 according to the actual liquid level height.

[0110] 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. The foregoing storage medium includes: various media such as a USB flash drive, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk, or an optical disc that can store program codes.

[0111] 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-conditioning system provided by the above-mentioned various methods, including: acquiring the actual liquid level height of the refrigerant in the liquid distributor 7; controlling and adjusting the opening degree of the solenoid valve 10 according to the actual liquid level height.

[0112] 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 implements the control method of the air-conditioning system provided by the above-mentioned various methods, including: obtaining the actual liquid level height of the refrigerant in the liquid distributor 7; controlling and adjusting the opening degree of the solenoid valve 10 according to the actual liquid level height.

[0113] 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.

[0114] 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 solution, 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 disk, etc., and includes several instructions for causing 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.

[0115] 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; and 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 the embodiments of the present invention.

Claims

1. An air conditioning system, characterized in that, Including: A compressor, a four-way valve, a condenser, a throttle valve and an evaporator connected by a refrigerant pipeline; Wherein, a liquid distributor is provided at the inlet of the evaporator, the evaporator includes a plurality of evaporation coils, the liquid distributor is respectively communicated with the plurality of evaporation coils through a plurality of liquid distribution pipes, and the number of the liquid distribution pipes and the evaporation coils is equal and they correspond one by one; The liquid distributor is also communicated with an exhaust pipe, the outlet of the exhaust pipe is communicated with the suction port of the compressor, and a solenoid valve is provided on the exhaust pipe.

2. The air conditioning system according to claim 1, wherein The liquid distributor has an inlet end and an outlet end, and the inner diameter of the liquid distributor gradually increases from the inlet end to the outlet end.

3. The air-conditioning system according to claim 2, wherein Both the liquid distribution pipe and the exhaust pipe are communicated with the outlet end, and the liquid distribution pipe extends below the liquid level of the liquid distributor, and the exhaust pipe is arranged at the top of the outlet end.

4. The air-conditioning system according to any one of claims 1 to 3, characterized in that Also including: A detection device, which is arranged in the liquid distributor and is used to detect the liquid level height of the liquid distributor; A control device, which is respectively connected with the detection device and the solenoid valve, and the control device is used to obtain the liquid level height of the liquid distributor according to the detection result of the detection device, and control and adjust the opening degree of the solenoid valve according to the liquid level height.

5. A control method for an air conditioning system according to any one of claims 1 to 4, characterized in that, Including: Obtaining the actual liquid level height of the refrigerant in the liquid distributor; Controlling and adjusting the opening degree of the solenoid valve according to the actual liquid level height.

6. The control method of the air conditioning system according to claim 5, characterized in that, Before the step of controlling and adjusting the opening degree of the solenoid valve according to the actual liquid level height, it also includes: obtaining the lowest liquid level height and the highest liquid level height of the refrigerant in the liquid distributor; Then the step of controlling and adjusting the opening degree of the solenoid valve according to the actual liquid level height specifically includes: Controlling and adjusting the opening degree of the solenoid valve according to the comparison results between the actual liquid level height and the lowest liquid level height and the highest liquid level height respectively.

7. The control method of the air conditioning system according to claim 5, characterized in that, The step of controlling and adjusting the opening degree of the solenoid valve according to the comparison results between the actual liquid level height and the lowest liquid level height and the highest liquid level height respectively specifically includes: When the actual liquid level height is equal to the highest liquid level height, controlling the solenoid valve to be in a closed state.

8. The control method of the air conditioning system according to claim 5, characterized in that, The step of controlling and adjusting the opening degree of the solenoid valve according to the comparison results between the actual liquid level height and the lowest liquid level height and the highest liquid level height respectively specifically includes: When the actual liquid level height is greater than the lowest liquid level height and less than the highest liquid level height, controlling the solenoid valve to be in an open state.

9. The control method of the air conditioning system according to claim 8, characterized in that, When the actual liquid level height is greater than the lowest liquid level height and less than the highest liquid level height, the step of controlling the solenoid valve to be in an open state specifically includes: Calculating the liquid level difference between the actual liquid level height and the highest liquid level height; Determining the initial opening degree of the solenoid valve according to the liquid level difference, and controlling the solenoid valve to open and reach the initial opening degree, wherein the initial opening degree is positively correlated with the liquid level difference.

10. The control method of the air conditioning system according to any one of claims 6 to 9, characterized in that, The obtaining method of the lowest liquid level height is as follows: Obtaining the highest liquid level height of the liquid distributor and the insertion depth of the liquid distribution pipe in the liquid distributor; Calculate the lowest liquid level height according to the highest liquid level height and the insertion depth, where the lowest liquid level height is equal to the difference between the highest liquid level height and the insertion depth.

11. The control method of the air conditioning system according to any one of claims 6 to 9, characterized in that, Further comprising: Control and adjust the opening degree of the throttle valve of the air conditioning system according to the actual liquid level height.

12. A control device for an air conditioning system according to any one of claims 1 to 4, characterized in that, Comprising: An acquisition module, configured to acquire the actual liquid level height of the refrigerant in the liquid distributor; A control module, configured to control and adjust the opening degree of the solenoid valve according to the actual liquid level height.

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