Air conditioning system comprising a gas-liquid separator and control method

Abstract

The present application relates to the technical field of air conditioners, and particularly provides an air conditioning system comprising a gas-liquid separator and a control method, aiming to solve the problem that the temperature of refrigerant in the gas-liquid separator is relatively low during the frosting and defrosting process of the heat exchanger of the outdoor unit of the existing air conditioning system, resulting in the frosting of water vapor in the environment on the surface of the sight glass, thereby affecting the observation effect of the liquid level of the refrigerant in the gas-liquid separator. The air conditioning system comprising the gas-liquid separator comprises a sight glass for observing the liquid level of the refrigerant in the gas-liquid separator and an anti-frosting device for preventing the frosting of the sight glass, the anti-frosting device comprises a transparent head, the anti-frosting device can be connected with the sight glass and form a closed space between the transparent head and the sight glass, the liquid level of the refrigerant in the gas-liquid separator can be observed through the transparent head and the sight glass, thereby, the closed space between the transparent head and the sight glass can isolate the water vapor in the air from contacting the sight glass, and frosting on the sight glass is avoided.

Description

Technical Field

[0001] This invention relates to the field of air conditioner technology, and specifically provides an air conditioning system and control method including a gas-liquid separator. Background Technology

[0002] Existing air conditioning systems are usually equipped with gas-liquid separators. The main function of the gas-liquid separator is to separate the gaseous and liquid phases of refrigerant and store some of the refrigerant in the system. This prevents liquid slugging in the compressor and avoids diluting the compressor oil due to excessive liquid refrigerant returning to the compressor, which would affect the compressor's service life.

[0003] When the newly developed gas-liquid separator (hereinafter referred to as "gas separator") is applied to the air conditioning system, it needs to be tested and verified. Among them, the liquid storage capacity of the gas separator is the most important aspect of the verification. When the unit is running in low-temperature heating mode (or other outdoor heat exchanger frosting mode), the outdoor heat exchanger will undergo frosting and defrosting processes due to the low temperature and high humidity environment on the outdoor side. When these two phenomena (frost and defrosting) occur, the refrigerant has a very low dryness when it enters the gas separator from the outdoor heat exchanger due to insufficient heat exchange. As a result, liquid refrigerant will accumulate in the gas separator. Once the liquid level of the refrigerant exceeds the lowest position of the gas separator outlet pipe, the compressor will experience liquid slugging due to the intake of too much liquid refrigerant, which will damage the compressor. Therefore, it is necessary to observe the liquid level of the refrigerant through a sight glass to determine the liquid storage capacity of the gas separator at various operating times. However, since the temperature of the refrigerant in the gas separator is usually low, water vapor in the environment will condense / frost on the surface of the sight glass, thus affecting the observation effect.

[0004] Accordingly, there is a need in the field for a new air conditioning system and control method that includes a gas-liquid separator to solve the existing problems. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned technical problem, namely, to solve the problem that during the frosting and defrosting process of the outdoor unit heat exchanger of the existing air conditioning system, the temperature of the refrigerant in the gas-liquid separator is low, which causes water vapor in the environment to condense / frost on the surface of the sight glass, thereby affecting the observation effect of the refrigerant level in the gas-liquid separator.

[0006] In a first aspect, the present invention provides an air conditioning system including a gas-liquid separator, the gas-liquid separator including a sight glass for observing the refrigerant level inside the gas-liquid separator and an anti-frost device for preventing frost from forming on the sight glass, the anti-frost device including a transparent end cap, the anti-frost device being connectable to the sight glass and forming a closed space between the transparent end cap and the sight glass, the refrigerant level inside the gas-liquid separator being observed through the transparent end cap and the sight glass.

[0007] In a specific embodiment of the air conditioning system including the gas-liquid separator described above, the gas-liquid separator body is provided with an observation channel, the sight glass is embedded in the observation channel, the anti-frost device further includes a sleeve and a first fixing ring, the transparent end cap can be sleeved on the outside of the sleeve, the first fixing ring can be sleeved on the outside of the transparent end cap to fix the transparent end cap to one end of the sleeve, and the other end of the sleeve can be sleeved on the observation channel.

[0008] In a specific embodiment of the air conditioning system including the gas-liquid separator, the anti-frost device further includes an air extraction device, which is connected to the enclosed space, and a valve is provided on the air extraction pipeline between the air extraction device and the enclosed space.

[0009] In a specific embodiment of the air conditioning system including the gas-liquid separator described above, the anti-frost device further includes a sealing ring and a second fixing ring. The sealing ring can be fixed to the other end of the sleeve by the second fixing ring, so that the sealing ring is fitted at the connection between the sleeve and the observation channel.

[0010] In the specific embodiment of the air conditioning system including the gas-liquid separator described above, the valve is a one-way valve, and / or the air extraction device is an air pump.

[0011] In a specific embodiment of the air conditioning system including the gas-liquid separator described above, an observation channel is provided on the main body of the gas-liquid separator, a sight glass is embedded in the observation channel, and a transparent end cap is embedded in the observation channel and disposed between the sight glass and the main body of the gas-liquid separator, so that a closed space is formed between the transparent end cap and the sight glass.

[0012] In a specific embodiment of the air conditioning system including the gas-liquid separator described above, the anti-frost device further includes an air extraction device, which is connected to the enclosed space. A valve is provided on the air extraction pipeline between the air extraction device and the enclosed space, and / or the transparent end cap is either transparent plastic or transparent glass.

[0013] In a specific embodiment of the air conditioning system including the gas-liquid separator described above, a heating belt is wound around the outside of the sleeve.

[0014] The present invention also provides a control method for an air conditioning system including a gas-liquid separator, the gas-liquid separator including a sight glass for observing the refrigerant level inside the gas-liquid separator and an anti-frost device for preventing frost formation on the sight glass. The anti-frost device includes a transparent end cap, an observation channel is provided on the gas-liquid separator body, the sight glass is embedded in the observation channel, the anti-frost device further includes a sleeve and a first fixing ring, the transparent end cap can be fitted onto the outside of the sleeve, the first fixing ring can be fitted onto the outside of the transparent end cap to fix the transparent end cap to one end of the sleeve, the other end of the sleeve can be fitted onto the observation channel, the anti-frost device further includes a sealing ring and a second fixing ring, the sealing ring can be fixed to the sleeve by the second fixing ring. At the other end, the sealing ring is fitted onto the connection between the sleeve and the observation channel. The air conditioning system includes a first temperature sensor for detecting ambient temperature, a second temperature sensor for detecting the temperature of the sleeve, and a heating device. A heating strip is wound around the outside of the sleeve, and the heating device can heat the heating strip. The control method includes: determining whether the running time of the air conditioning system has reached a preset time t; acquiring temperature data T1 from the first temperature sensor and temperature data T2 from the second temperature sensor; if the running time of the air conditioning system has reached the preset time t, comparing the magnitudes of T1 and T2; if T2 < T1, controlling the heating module to heat the heating strip; if T2 ≥ T1, controlling the heating module to stop heating the heating strip.

[0015] In a specific embodiment of the control method for an air conditioning system including a gas-liquid separator, the step of "if T2≥T1, then control the heating module to stop heating the heating band" further includes: if T2≥T1 and the difference between T2 and T1 is greater than a preset difference A, then control the heating module to stop heating the heating band.

[0016] By adopting the above technical solution, the present invention can prevent water vapor in the air from frosting on the surface of the sight glass. Specifically, the present invention adds an anti-frost device including a transparent end cap to the outside of the sight glass, so that a closed space is formed between the transparent end cap and the sight glass, thereby preventing the sight glass from contacting water vapor in the air. This solves the problem that in the existing air conditioning system, during the frosting and defrosting process of the outdoor unit heat exchanger, the temperature of the refrigerant in the gas-liquid separator is low, causing water vapor in the environment to frost on the surface of the sight glass, thus affecting the observation effect of the refrigerant level in the gas-liquid separator. In addition, since a transparent end cap is used, it will not affect the user's observation of the refrigerant level in the gas-liquid separator through the sight glass. Attached Figure Description

[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

[0018] Figure 1 This is an assembly diagram of the anti-frost device being installed on the gas-liquid separator;

[0019] Figure 2 This is a magnified view of a portion of the connection between the anti-frost device and the observation channel, in which... Figure 2 yes Figure 1 Point A in the middle;

[0020] Figure 3 This is an exploded view of the anti-frost device;

[0021] Figure 4 This is a schematic diagram of an anti-frost device including a heating element;

[0022] Figure 5 This is a flowchart of a control method for an air conditioning system that includes a gas-liquid separator.

[0023] List of reference numerals in the attached diagram:

[0024] 1-Gas-liquid separator;

[0025] 11-Sight lens;

[0026] 12- Anti-frost device;

[0027] 121-Transparent end cap; 122-Sleeve; 123-First retaining ring;

[0028] 124 - Air extraction device (air pump); 125 - Valve (check valve);

[0029] 126 - Sealing ring; 127 - Second fixing ring; 128 - Air extraction line;

[0030] 13-Gas-liquid separator body;

[0031] 14-Observation Channel;

[0032] 15-Heating belt;

[0033] 2-Second temperature sensor. Detailed Implementation

[0034] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the invention and are not intended to limit the scope of protection of the invention. Those skilled in the art can make adjustments as needed to adapt to specific applications. For example, although the description of the transparent end cap uses transparent glass as an example, the present invention can obviously employ various other transparent end caps, as long as the transparent end cap is transparent and can form a closed space with the sight glass.

[0035] It should be noted that in the description of this invention, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] Furthermore, it should be noted that, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] First, borrow Figure 1 The problems existing in the gas-liquid separator 1 of the current air conditioning system are described. Figure 1This is an assembly diagram of the anti-frost device 12 of the present invention installed on the gas-liquid separator 1. The two arrows in the diagram represent the flow directions of refrigerant into and out of the gas-liquid separator 1, respectively. Existing air conditioning systems are usually equipped with a gas-liquid separator 1. The main function of the gas-liquid separator 1 is to separate the gaseous and liquid phases of the refrigerant and store a portion of the refrigerant in the system. This prevents liquid slugging in the compressor and avoids diluting the compressor oil due to excessive liquid refrigerant returning to the compressor, which would affect the compressor's service life. When the newly developed gas-liquid separator 1 is applied to an air conditioning system, it needs to be tested and verified. Among these tests, the liquid storage capacity of the gas-liquid separator 1 is of paramount importance. When the unit operates in low-temperature heating mode (or other conditions where the outdoor heat exchanger is prone to frosting), the outdoor unit's heat exchanger will undergo frosting and defrosting processes due to the low-temperature and high-humidity environment on the outdoor side. During these two phenomena (frosting and defrosting), the refrigerant's dryness is very low when it enters the gas-liquid separator 1 due to insufficient heat exchange. This causes liquid refrigerant to accumulate in the gas-liquid separator 1. Once the refrigerant level exceeds the lowest point of the outlet pipe of the gas-liquid separator 1, the compressor will experience liquid slugging due to excessive liquid refrigerant intake, potentially damaging the compressor. Therefore, it is necessary to check the liquid level by sight glass. The sight glass 11 is used to observe the refrigerant level, thereby determining the liquid storage capacity of the gas-liquid separator 1. However, due to the low temperature inside the gas-liquid separator 1, this low temperature is transmitted to the sight glass 11, causing the temperature of the sight glass 11 to drop. The other side of the sight glass 11 is in the external environment, where there is a lot of water vapor. When the water vapor cools down, it will condense into frost on the sight glass 11, affecting the user's ability to observe the refrigerant level inside the gas-liquid separator 1 through the sight glass 11. Therefore, the present invention proposes the following solution, which will be described below with reference to the accompanying drawings.

[0038] like Figures 1-3 As shown, to address the problem that in existing air conditioning systems, during the frosting and defrosting process of the outdoor unit heat exchanger, the refrigerant temperature in the gas-liquid separator 1 is low, causing water vapor in the environment to frost on the surface of the sight glass 11, thus affecting the observation of the refrigerant level in the gas-liquid separator 1, this invention includes a sight glass 11 for observing the refrigerant level in the gas-liquid separator 1 and an anti-frost device 12 for preventing frosting on the sight glass 11. The anti-frost device 12 is sleeved and connected to the outside of the sight glass 11. Specifically, multiple observation channels 14 are provided on the side wall of the gas-liquid separator 1, and the sight glass 11 is embedded in the observation channels 14. The left end of the anti-frost device 12 (e.g., Figure 3The device (in the direction of the view) includes a transparent end cap 121, a sleeve 122, and a first fixing ring 123. The transparent end cap 121 is made of transparent plastic and is closed at one end. The transparent end cap 121 can be fitted onto the outside of the sleeve 122. The first fixing ring 123 can be fitted onto the outside of the transparent end cap 121 to fix the transparent end cap 121 to one end of the sleeve 122. The right end of the anti-frost device 12 includes a sealing ring 126 and a second fixing ring 127. A part of the sealing ring 126 is fitted onto the outside of the sleeve 122 and fixed by the second fixing ring 127. The part of the sealing ring 126 that is not fitted onto the sleeve 122 can be fitted onto the observation channel 14, thereby forming a closed space between the transparent end cap 121 and the sight glass 11.

[0039] First, it should be noted that the prerequisite for water vapor in the air to frost on the surface of the sight glass 11 is that there is a significant temperature difference between the two sides of the sight glass 11, and that there is more water vapor in the air on the side with the higher temperature. The high-temperature water vapor condenses into frost on the surface of the sight glass 11 upon cooling. In the above-described embodiment, during the installation of the gas-liquid separator 1 for the air conditioning system of the present invention, firstly, a portion of the sealing ring 126 is fitted onto the sleeve 122, and the portion not fitted onto the sleeve 122 is fitted onto the observation channel 14. Then, the second fixing ring 127 is fitted onto the outside of the sealing ring 126, thereby achieving a seal between the sealing ring 126 and the connection between the sleeve 122 and the observation channel 14. Then, the transparent end cap 121 is fitted onto the other end of the sleeve 122, and the first fixing ring 123 is fitted onto the outside of the transparent end cap 121, thereby achieving a connection between the transparent end cap 121 and the sleeve 122. The transparent end cap 121 and the sight glass 11... This creates a closed space. During the use of the gas-liquid separator 1 for the air conditioning system of the present invention, even if the temperature inside the gas-liquid separator 1 is low, resulting in a relatively low temperature on the surface of the sight glass 11 near the gas-liquid separator 1, the closed space between the sight glass 11 and the transparent end cap 121 creates a greater distance between the surface of the sight glass 11 away from the gas-liquid separator 1 and the external environment. As a result, the higher temperature in the external environment will be significantly dissipated during the transfer to the sight glass 11, thus preventing a significant increase in the temperature of the surface of the sight glass 11 away from the gas-liquid separator 1. This reduces the temperature difference between the two surfaces of the sight glass 11, making it less likely for frost to form on the sight glass 11. On the other hand, the existence of the closed space limits the water vapor content in the air within the closed space, thus limiting the total amount of water vapor that can condense on the surface of the sight glass 11 away from the gas-liquid separator 1. This further reduces the possibility of frost forming on the surface of the sight glass 11.

[0040] In addition, regarding the transparent end cap 121, although it was mentioned above that the transparent end cap 121 is made of transparent plastic, this is not the only material for the transparent end cap 121. Those skilled in the art can also choose other common transparent materials, such as transparent glass. These simple changes do not exceed the protection scope of this invention.

[0041] The main embodiments of the present invention have been described above. Next, some preferred embodiments of the present invention will be described.

[0042] like Figure 3 As shown, in one possible implementation, the anti-frost device 12 further includes an air extraction device 124, which is connected to the enclosed space. A valve 125 is provided on the air extraction pipeline 128 between the air extraction device 124 and the enclosed space. The valve 125 is a one-way valve, and the air extraction device 124 is an air pump 124.

[0043] In the above-described embodiment, during the use of the gas-liquid separator 1 for an air conditioning system according to the present invention, after the transparent end cap 121 and the sealing ring are installed on the sleeve 122 and on the observation channel 14, the vacuum device 124 is turned on. The air in the enclosed space is drawn into the vacuum device 124 through the one-way valve 125 along the vacuum pipe 128, thereby creating a vacuum in the enclosed space between the sight glass 11 and the transparent end cap 121. In this way, the contact between the surface of the sight glass 11 away from the gas-liquid separator 1 and water vapor is completely isolated, thereby ensuring that frost will not form on the surface of the sight glass 11 away from the gas-liquid separator 1. Furthermore, due to the presence of the one-way valve 125, no air will enter the enclosed space along the vacuum pipe 128 after the vacuum is completed.

[0044] It is worth mentioning that, when using the above-described embodiments, since there will be a large negative pressure in the enclosed space during and after the vacuuming process, the transparent end cap 121 should be made of a material with sufficient strength, such as tempered glass or high-strength transparent plastic, which are all within the technical principles of this invention.

[0045] like Figure 4 As shown, in one possible implementation, a heating band 15 is wound around the outer side of the sleeve 122.

[0046] As mentioned above, a closed space is formed between the sight glass 11 and the transparent end cap 121, resulting in a greater distance between the surface of the sight glass 11 away from the gas-liquid separator 1 and the external environment. Consequently, the higher temperature from the external environment is significantly dissipated during its transfer to the sight glass 11, thus preventing a substantial increase in the temperature of the surface of the sight glass 11 away from the gas-liquid separator 1. This reduces the temperature difference between the two surfaces of the sight glass 11. Simultaneously, the reduced water vapor content in the air surrounding the surface of the sight glass 11 away from the gas-liquid separator 1, combined with these two factors, prevents frost formation on the surface of the sight glass 11. Similarly, under these conditions, some of the lower temperature inside the gas-liquid separator 1 can be transferred to the surface of the transparent end cap 121 facing the closed space. Since the surface of the transparent end cap 121 facing the external environment has a higher temperature, there will be a temperature difference between the two surfaces of the transparent end cap 121. However, since the air on the surface facing the external environment contains a lot of water vapor, there is a risk of frost forming on the surface of the transparent end cap 121 facing the external environment. Therefore, in this embodiment, a heating band 15 is wound around the outside of the sleeve 122. The heat of the heating band 15 is transferred to the sleeve 122, so that the sleeve 122 can heat the sight glass 11 inside and the transparent end cap 121 outside it, thereby eliminating the temperature difference between the two surfaces of the sight glass 11 and the transparent end cap 121, and ensuring that frost does not form on the sight glass 11 and the transparent end cap 121.

[0047] In one possible implementation, the gas-liquid separator body 13 is provided with an observation channel 14, a sight glass 11 is embedded in the observation channel 14, and a transparent end cap 121 is embedded in the observation channel 14 and positioned between the sight glass 11 and the gas-liquid separator body 13, so that a closed space is formed between the transparent end cap 121 and the sight glass 11. The anti-frost device 12 also includes an air extraction device 124, which is connected to the closed space. A valve 125 is provided on the air extraction pipeline 128 between the air extraction device 124 and the closed space.

[0048] In the above-described embodiment, unlike the previously mentioned embodiments, the anti-frost device 12 in this embodiment only includes a transparent end cap 121, an air extraction device 124, and a valve 125 installed on the air extraction pipeline 128. By embedding the transparent end cap 121 into the observation channel 14, a closed space is formed between the transparent end cap 121 and the sight glass 11 within the observation channel 14. Then, the air extraction device 124 evacuates the closed space to a vacuum, so that the lower temperature inside the gas-liquid separator 1 is absorbed by the vacuum when it reaches the transparent end cap 121. The barrier prevents the lower temperature from reaching the sight glass 11, ensuring a small temperature difference between the two surfaces of the sight glass 11. Therefore, even though the sight glass 11 is in the external environment and there is a lot of water vapor in the air surrounding its surface, frost will not form on the surface of the sight glass 11. At the same time, the high temperature in the external air cannot be transferred to the transparent end cap 121, ensuring a small temperature difference between the two surfaces of the transparent end cap 121. In addition, since there is no water vapor in the vacuum sealed space, frost will not form on the surface of the transparent end cap 121.

[0049] The advantages of the above-described embodiment are as follows: by embedding the transparent end cap 121 into the observation channel 14, compared with the aforementioned embodiment, the number of parts such as the sleeve 122, the first fixing ring 123, the second fixing ring 127 and the sealing ring 126 is reduced, thus reducing the space occupied by the anti-frost device 12. At the same time, the fewer parts make it easier to install and disassemble the anti-frost device 12, and also avoid the problem of air leakage caused by loose fit between parts.

[0050] In addition, the present invention also provides a control method for an air conditioning system including a gas-liquid separator. In one possible embodiment, the air conditioning system includes a first temperature sensor (not shown in the figure) for detecting the ambient temperature, a second temperature sensor 2 for detecting the temperature of the sleeve 122, and a heating device (not shown in the figure). A heating belt 15 is wound around the outside of the sleeve 122, and the heating device is capable of heating the heating belt 15. Figure 4 , Figure 5 As shown, the control methods include:

[0051] S01. Determine whether the air conditioning system has reached the preset time t.

[0052] S02, acquire the temperature data T1 from the first temperature sensor and the temperature data T2 from the second temperature sensor 2;

[0053] S03. If the air conditioning system runs for a preset time t, then compare the magnitudes of T1 and T2.

[0054] S031. If T2 < T1, then control the heating module to heat the heating band 15.

[0055] S032. If T2≥T1, then control the heating module to stop heating the heating band 15.

[0056] Step S032 further includes:

[0057] S0321. If T2 ≥ T1 and the difference between T2 and T1 is greater than the preset difference A, then control the heating module to stop heating the heating band 15.

[0058] As mentioned above, a heating belt 15 is wound around the outside of the sleeve 122, and the principle of how the heating belt 15 eliminates the temperature difference between the two surfaces of the sight glass 11 and ensures that frost will not form on the sight glass 11 has been explained. Therefore, this embodiment proposes a method to control whether the heating belt 15 heats, further refining the above solution. In this embodiment, after the air conditioning system is turned on, it is first determined whether the running time of the air conditioning system has reached the preset time t. At the same time, the temperature data T1 of the first temperature sensor and the temperature data T2 of the second temperature sensor 2 are acquired. If the running time of the air conditioning system reaches the preset time t, it proves that the air conditioning system is running normally and stably. At this time, the ambient temperature T1 and the sleeve 122 temperature T2 are compared. If T2 < T1 indicates that the temperature of the sleeve 122 is lower than the ambient temperature, and therefore the temperature of the sight glass 11 inside the sleeve 122 is also lower than the ambient temperature. To avoid a large temperature difference on the surface of the sight glass 11, the heating module is controlled to heat the heating band 15. The heating band 15 heats the sleeve 122 and the sight glass 11 inside the sleeve 122 until T2≥T1 and the difference between T2 and T1 is greater than the preset difference A. Then the heating module is controlled to stop heating the heating band 15. In this way, the temperature of the sleeve 122 and the sight glass 11 will be higher than the ambient temperature, thus avoiding a large temperature difference on the surface of the sight glass 11 and frost formation. On the other hand, if the ambient temperature T1 and the sleeve 122 temperature T2 are compared and it is found that T2≥T1, the heating module is directly controlled not to heat the heating band 15.

[0059] The advantage of the above implementation is that by determining that the heating module stops heating the heating band 15 only when T2 ≥ T1 and the difference between T2 and T1 is greater than a preset difference A, the heating module can be prevented from frequently starting and stopping. Specifically, if heating is stopped when T2 ≥ T1, the sleeve 122 will slowly dissipate heat in the air. When the air conditioning system periodically detects T1 and T2, it will immediately control the heating module to turn on once T2 < T1, and control the heating module to turn off when T2 ≥ T1. In this way, the heating module will frequently heat and stop, which will wear out the heating module. To extend the service life, in the above embodiment, the heating module is only controlled to stop heating the heating band 15 when T2≥T1 and the difference between T2 and T1 is greater than the preset difference A. This ensures that the temperature T2 of the sleeve 122 will decrease to below the ambient temperature T1 after a period of time, reducing the start-stop frequency of the heating module and protecting its service life. Similarly, when comparing the ambient temperature T1 and the sleeve 122 temperature T2 and finding that T2≥T1, the heating module is directly controlled not to heat the heating band 15. This is also to minimize the start-up of the heating module while ensuring that there is no temperature difference on the surface of the sight glass 11.

[0060] In summary, this invention, by fitting an anti-frost device 12 including a transparent cap 121 around the observation channel 14 of the sight glass 11 on the gas-liquid separator 1, creates a closed space between the transparent cap 121 and the sight glass 11, thereby reducing the temperature difference on the surface of the sight glass 11 and also reducing the amount of water vapor that can frost on the surface of the sight glass 11, thus preventing frost formation. Simultaneously, the presence of the transparent cap 121 ensures that the operator can observe the refrigerant level inside the gas-liquid separator 1 through the transparent cap 121 and the sight glass 11, ensuring the normal functioning of the sight glass 11. Furthermore, to further reduce the temperature difference on the sight glass 11... To further reduce the water vapor content on the surface of the sight glass 11, this invention also connects a vacuum device 124 to the closed space formed between the sight glass 11 and the transparent end cap 121. By vacuuming the closed space, the water vapor content around the sight glass 11 is further reduced, thereby further preventing frost from forming on the surface of the sight glass 11. In addition, to further prevent frost from affecting observation on the sight glass 11 and the transparent end cap 121, this invention also provides a heating belt 15 on the sleeve 122 of the anti-frost device 12. The heating belt 15 adjusts the temperature difference between the two surfaces of the sight glass 11 and the transparent end cap 121, ensuring that no frost forms on the sight glass 11 and the transparent end cap 121.

[0061] It should be noted that the above embodiments are merely used to illustrate the principles of the present invention and are not intended to limit the scope of protection of the present invention. Without departing from the principles of the present invention, those skilled in the art can adjust the above structure so that the present invention can be applied to more specific application scenarios.

[0062] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. An air conditioning system comprising a gas-liquid separator, characterized by, The gas-liquid separator comprises a sight glass for observing the refrigerant level in the gas-liquid separator and an anti-frosting device for preventing the sight glass from frosting, the anti-frosting device comprises a transparent head, the anti-frosting device can be connected with the sight glass and form a closed space between the transparent head and the sight glass, the level of the refrigerant in the gas-liquid separator can be observed through the transparent head and the sight glass, an observation channel is arranged on the body of the gas-liquid separator, the sight glass is embedded in the observation channel, the anti-frosting device further comprises a sleeve and a first fixing ring, the transparent head can be sleeved on the outside of the sleeve, the first fixing ring can be sleeved on the outside of the transparent head to fix the transparent head on one end of the sleeve, the other end of the sleeve can be sleeved on the observation channel, and a heating belt is wound on the outside of the sleeve.

2. The air conditioning system comprising a gas-liquid separator according to claim 1, wherein, The anti-frosting device further comprises an air extraction device, the air extraction device communicates with the closed space, and a valve is arranged on an air extraction pipeline between the air extraction device and the closed space.

3. The air conditioning system comprising a gas-liquid separator according to claim 2, wherein, The anti-frosting device further comprises a sealing ring and a second fixing ring, the sealing ring can be fixed on the other end of the sleeve through the second fixing ring, so that the sealing ring is sleeved on the connection between the sleeve and the observation channel.

4. The air conditioning system comprising a gas-liquid separator according to claim 2, wherein, The valve is a one-way valve, and / or, The air extraction device is an air pump.

5. A control method for an air conditioning system including a gas-liquid separator, characterized by, The gas-liquid separator comprises a sight glass for observing the refrigerant level in the gas-liquid separator and an anti-frosting device for preventing the sight glass from frosting, the anti-frosting device comprises a transparent head, an observation channel is arranged on the body of the gas-liquid separator, the sight glass is embedded in the observation channel, the anti-frosting device further comprises a sleeve and a first fixing ring, the transparent head can be sleeved on the outside of the sleeve, the first fixing ring can be sleeved on the outside of the transparent head to fix the transparent head on one end of the sleeve, the other end of the sleeve can be sleeved on the observation channel, the anti-frosting device further comprises a sealing ring and a second fixing ring, the sealing ring can be fixed on the other end of the sleeve through the second fixing ring, so that the sealing ring is sleeved on the connection between the sleeve and the observation channel, the air conditioning system comprises a first temperature sensor for detecting the ambient temperature, a second temperature sensor for detecting the temperature of the sleeve, and a heating device, a heating belt is wound on the outside of the sleeve, the heating device can heat the heating belt, and the control method comprises: determining whether the running time of the air conditioning system reaches a preset time t; obtaining temperature data T1 of the first temperature sensor and temperature data T2 of the second temperature sensor; if the running time of the air conditioning system reaches the preset time t, comparing the sizes of T1 and T2; if T2 < T1, controlling the heating device to heat the heating belt; if T2 ≥ T1, controlling the heating device to stop heating the heating belt.

6. The control method for an air conditioning system including a gas-liquid separator according to claim 5, characterized by, The step of "if T2 ≥ T1, controlling the heating device to stop heating the heating belt" further comprises: If T2≥T1 and the difference between T2 and T1 is greater than a preset difference A, then the heating device is controlled to stop heating the heating belt.

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