Refrigeration system and control method thereof

Abstract

The present invention provides a refrigeration system and a control method thereof. The refrigeration system includes a gas-liquid separator, which includes a housing, a liquid level detection device, and a heating device. The housing can contain gas and / or liquid. The liquid level detection device is disposed within the housing and can detect the liquid level. The heating device is disposed within the housing and can heat the liquid. The liquid level detection device and the heating device are integrated into one body. The liquid level detection device can control the heating device to heat or not heat according to the liquid level. According to the present invention, the refrigerant liquid accumulated in the gas-liquid separator can be automatically controlled to be heated and vaporized according to the liquid level, effectively preventing the liquid level in the gas-liquid separator from being too high and improving the startup reliability of the compressor.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration, and in particular to a refrigeration system and a control method thereof. Background Art

[0002] With the widespread application of 4G and the gradual popularization of 5G, the heat generated by various data processing equipment is increasing, and data centers have higher and higher requirements for the cooling capacity and energy efficiency of air-conditioning equipment.

[0003] Using outdoor natural cooling sources during transitional and cold winter months to cool data centers can significantly reduce air conditioning equipment operating costs. A common cooling system is one that uses a combination of fluorine pump heat pipes and compression refrigeration. During winter and transitional periods, when outdoor cold air is a suitable natural cooling source, the fluorine pump heat pipe cooling mode is activated, the compressor is stopped, and the fluorine pump drives the refrigerant to achieve heat pipe cooling. The heat pipe transfers the cooling energy from the outdoor natural cooling source (cold air) during winter and transitional periods into the indoor space to cool the data center, significantly reducing equipment operating costs.

[0004] Split-type air conditioners typically utilize mechanically driven, split heat pipes, such as a liquid or air pump, to drive the refrigerant flow within the heat pipes. When heat pipes share a system with compression refrigeration units, a throttling element and solenoid valve are typically connected in parallel. During compression refrigeration operation, the solenoid valve is closed, allowing the refrigerant to pass through the throttling element at reduced pressure. When the fluorine pump heat pipe is operating, the solenoid valve is opened, allowing the refrigerant to primarily flow through the low-resistance solenoid valve, avoiding excessive gravity or pump head consumption when passing through the throttling element.

[0005] Although the combination of heat pipes and heat pumps can reduce the number of parts when sharing a system, the debugging and optimization of the system is a very complex issue, and there are also some issues in the reliable operation of the system that cannot be ignored. For example, if a gas-liquid separator is set between the evaporator and the compressor, the refrigerant gas at the outlet of the evaporator may carry refrigerant liquid that has not been completely evaporated when the fluorine pump heat pipe is running. It is possible that too much refrigerant liquid will accumulate in the gas-liquid separator, thereby affecting the refrigerant flow rate of the fluorine pump heat pipe system, causing the liquid level of the liquid storage tank set at the inlet end of the fluorine pump to be too low, which is easy to cause cavitation at the suction end of the fluorine pump; when the fluorine pump heat pipe mode is converted to compression refrigeration mode, the excessive accumulation of refrigerant liquid in the gas-liquid separator is also easy to cause the compressor to inhale liquid, which is extremely prone to liquid hammer and reduces the operational reliability of the compressor.

[0006] Conventional refrigeration equipment typically has its compressor and gas-liquid separator installed outdoors. As outdoor temperatures gradually drop in winter, indoor refrigerant gas can slowly migrate to the outdoor unit. It can also gradually cool and liquefy within the gas-liquid separator, potentially causing excessive refrigerant liquid to accumulate inside the separator, hindering compressor startup. Therefore, addressing this issue of excessive refrigerant liquid accumulation within the separator is crucial, necessitating the design of a multifunctional gas-liquid separator.

[0007] Since the gas-liquid separator in the refrigeration system in the prior art has technical problems such as excessive accumulation of refrigerant liquid in the gas-liquid separator, which easily affects the startup reliability of the compressor, the present invention studies and designs a refrigeration system and a control method thereof. Summary of the Invention

[0008] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the gas-liquid separator of the refrigeration system in the prior art that there is excessive accumulation of refrigerant liquid in the gas-liquid separator, which easily affects the starting reliability of the compressor, thereby providing a refrigeration system and its control method.

[0009] In order to solve the above problems, the present invention provides a refrigeration system, comprising:

[0010] A gas-liquid separator includes a shell, a liquid level detection device and a heating device. The shell can hold gas and / or liquid. The liquid level detection device is arranged inside the shell and can detect the liquid level height of the liquid. The heating device is arranged in the shell and can heat the liquid. The liquid level detection device and the heating device are integrated into one. The liquid level detection device can control the heating device to heat or not according to the height of the liquid level.

[0011] In some embodiments, the system further includes a compressor, a condenser, a liquid storage tank, an evaporator and a throttle valve, wherein the compressor, the condenser, the liquid storage tank, the throttle valve, the evaporator and the gas-liquid separator constitute a compression cycle system.

[0012] In some embodiments, the refrigeration system further includes a one-way valve, a fluorine pump and a solenoid valve, the throttle valve is connected between the liquid storage tank and the evaporator, the solenoid valve is connected in series with the fluorine pump and then arranged in parallel at both ends of the throttle valve, the one-way valve is arranged in parallel at both ends of the compressor and the gas-liquid separator connected in series, and the fluorine pump, the solenoid valve, the evaporator, the one-way valve, the condenser and the liquid storage tank constitute a fluorine pump circulation system;

[0013] Alternatively, the refrigeration system also includes a one-way valve, a fluorine pump and a one-way valve A. The throttle valve and the fluorine pump are connected in series and connected between the liquid storage tank and the evaporator. The one-way valve A is arranged in parallel at both ends of the fluorine pump. The one-way valve is arranged in parallel at both ends of the compressor and the gas-liquid separator after being connected in series. The fluorine pump, the throttle valve, the evaporator, the one-way valve, the condenser and the liquid storage tank constitute a fluorine pump circulation system.

[0014] In some embodiments, the liquid level detection device includes a floating member, which can float on the liquid surface and float up and down with the liquid surface. The heating device includes a switch structure, a power cord and a heating element. The power cord is connected to the heating element to heat the liquid through the heat generated by the heating element. The switch structure can control the power on and off of the power cord, and the switch structure can be controlled by the floating member to be opened or closed.

[0015] In some embodiments, when the floating member detects that the liquid level rises to above a preset height, the switch structure opens, thereby controlling the power cord to be powered on, the heating element to be powered on and to heat the liquid; when the floating member detects that the liquid level drops to below a preset height, the switch structure closes, thereby controlling the power cord to be powered off, the heating element to be powered off and not to heat the liquid.

[0016] In some embodiments, the heating device further includes a sleeve, the power cord and the heating element are both arranged inside the sleeve, the floating member is sleeved on the outside of the sleeve, and the floating member can slide up and down on the sleeve.

[0017] In some embodiments, the floating member is a float ball, the switch structure is a magnetic switch, and the magnetic switch is located inside the sleeve.

[0018] In some embodiments, the liquid level detection device further includes a first limit member and a second limit member, wherein the first limit member and the second limit member are both fixed to the outer periphery of the sleeve, and the first limit member is located below the floating member so as to limit the lowest position of the downward movement of the floating member, and the second limit member is located above the floating member so as to limit the highest position of the upward movement of the floating member.

[0019] In some embodiments, the vertical height of the switch structure corresponds to that of the floating member, and the vertical height of the switch structure is located between the first limiting member and the second limiting member.

[0020] In some embodiments, the floating member includes a floating member 1 and a floating member 2, and the floating member 1 and the floating member 2 are arranged at different height positions on the sleeve, and the height of the floating member 2 is higher than the height of the floating member 1. The switch structure includes a switch structure 1 and a switch structure 2, and the switch structure 1 is arranged corresponding to the floating member 1 and can be opened or closed by the height control of the floating member 1, and the switch structure 2 is arranged corresponding to the floating member 2 and can be opened or closed by the height control of the floating member 2.

[0021] In some embodiments, when the first floating member detects that the liquid level has risen above a first preset height, the first switch structure is opened, thereby controlling the power cord to be energized, the heating element to be energized and to heat the liquid; when the second floating member detects that the liquid level has risen above a second preset height, the second switch structure is opened, thereby controlling the power cord to increase the current power, thereby increasing the heating power of the heating element; the second preset height is higher than the first preset height;

[0022] When the second floating part detects that the liquid level has dropped below the second preset height, the second switch structure is closed, the power line is controlled to reduce the current power, and the heating element reduces the heating power; when the first floating part detects that the liquid level has dropped below the first preset height, the first switch structure is closed, the power line is controlled to cut off the power, and the heating element is cut off and does not heat the liquid.

[0023] In some embodiments, when the liquid level detection device further includes a first limiter and a second limiter:

[0024] The first limiting member also includes a first limiting member 1 and a first limiting member 2, and the second limiting member also includes a second limiting member 1 and a second limiting member 2. The first limiting member 1 is located below the floating member 1 so as to limit the lowest position of the downward movement of the floating member 1, and the second limiting member 1 is located above the floating member 1 so as to limit the highest position of the upward movement of the floating member 1; the first limiting member 2 is located below the floating member 2 so as to limit the lowest position of the downward movement of the floating member 2, and the second limiting member 2 is located above the floating member 2 so as to limit the highest position of the upward movement of the floating member 2.

[0025] In some embodiments, the vertical height of the switch structure 1 is located between the first limiter 1 and the second limiter 1; the vertical height of the switch structure 2 is located between the first limiter 2 and the second limiter 2.

[0026] In some embodiments, the height difference between the preset height one and the preset height two can be detected and calculated, the time difference between the sequential opening of the switch structure one and the switch structure two can be detected and calculated, and the speed of the liquid level rise can be calculated.

[0027] In some embodiments, the switch structure is arranged in series with the power line, and the power on and off of the power line can be controlled by opening and closing the switch structure, so that the power line is powered when the switch structure is opened, and the power line is powered off when the switch structure is closed;

[0028] Alternatively, the switch structure is arranged in parallel with the power line, and the switch structure is electrically connected to the signal line, and can control the signal line to output different signals by opening and closing the switch structure, and then control the power on and off of the power line through the signal line, so that the power line is powered on when the switch structure is opened, and the power line is powered off when the switch structure is closed.

[0029] In some embodiments, the heating element is a spiral structure, and the sleeve part that cooperates with the heating element is also a spiral structure, and a heat-conducting material is arranged between the heating element and the sleeve; the shell is a split structure and includes an upper shell and a lower shell connected to each other, and the gas-liquid separator also includes an air inlet pipe and an air outlet pipe.

[0030] The present invention also provides a control method for the aforementioned refrigeration system, comprising:

[0031] a detection step of detecting the liquid level by the liquid level detection device;

[0032] a judging step of judging whether the liquid level is higher than a preset height;

[0033] The control step is as follows: when it is detected that the liquid level rises to above a preset height, the heating device is turned on and heats the liquid; when it is detected that the liquid level drops to below the preset height, the heating device is turned off and does not heat the liquid.

[0034] In some embodiments, when the liquid level detection device includes a floating member that can float on the liquid surface and rise and fall with the liquid surface, and the heating device includes a switch structure, a power cord, and a heating element:

[0035] a detection step of detecting the liquid level by the floating member;

[0036] a judging step of judging whether the liquid level is higher than a preset height;

[0037] Control step: When it is detected that the liquid level rises above the preset height, the switch structure opens, controlling the power supply line to be powered on, and the heating element is powered on to heat the liquid; when it is detected that the liquid level drops below the preset height, the switch structure closes, controlling the power supply line to be powered off, and the heating element is powered off without heating the liquid.

[0038] In some embodiments, in the detection step, the duration t when the liquid level rises above the preset height is also detected;

[0039] In the judgment step, the relationship between the duration t and the preset time t1 and the preset time t2 is judged;

[0040] In the control step, when t > t1, the power of the power supply line is controlled to increase to n1 times the original power; when t > t2, the power of the power supply line is controlled to increase to n2 times the original power, where t1 and t2 are both constants and t2 > t1 > 0, and n1 and n2 are both constants and n2 > n1 > 0.

[0041] In some embodiments, when the floating member includes a first floating member and a second floating member, the first floating member and the second floating member are arranged at different height positions on the sleeve, and the height of the second floating member is higher than the height of the first floating member, and the switch structure includes a first switch structure and a second switch structure, the first switch structure is correspondingly arranged with the first floating member and can be controlled to be opened or closed by the height of the first floating member, and the second switch structure is correspondingly arranged with the second floating member and can be controlled to be opened or closed by the height of the second floating member;

[0042] In the detection step, the preset height one at which the first floating member opens the first switch structure as the liquid level rises is detected, and the preset height two at which the second floating member opens the second switch structure as the liquid level rises is detected, and the time difference △t between the opening of the first switch structure and the opening of the second switch structure is detected; where the preset height two is higher than the preset height one;

[0043] Calculation step: Calculate the height difference △H between the preset height two and the preset height one, and calculate the liquid level change rate v = △H / △t,

[0044] In the control step, the current multiple k of the heating device is adjusted according to the magnitude of the liquid level change rate v, where k is a preset parameter, k increases when v increases, and k remains unchanged or decreases when v decreases.

[0045] In some embodiments, k is related to the interval where the v value is located. When 0 < v < 1 cm / min, k = 1.5; when 1 ≤ v < 3 cm / min, k = 2; when v ≥ 3 cm / min, k = 3.

[0046] The refrigeration system and control method provided by the present invention have the following beneficial effects:

[0047] The present invention provides a liquid level detection device and a heating device disposed inside the shell of the gas-liquid separator. The liquid level detection device can be used to detect the height of the liquid level, and the heating device can be used to heat the liquid. The present invention creatively integrates the liquid level detection device and the heating device into one body, and the heating device is controlled to be turned on or off according to the liquid level detected by the liquid level detection device. When the liquid level is high, the heating device can be automatically turned on to heat the liquid. When the liquid level is high, the liquid level can be lowered by heating the liquid, effectively reducing the amount of liquid inside the gas-liquid separator, preventing excessive accumulation of refrigerant liquid, avoiding affecting the startup reliability of the compressor, and effectively preventing liquid hammer in the compressor. When the liquid level is low, the heating device is automatically controlled to be turned off by the liquid level detection device, thereby preventing the liquid level from being too low, reducing the power of the heating device, and improving the energy efficiency of the refrigeration system. Therefore, the present invention can automatically control whether the refrigerant liquid accumulated inside the gas-liquid separator is heated and vaporized according to the height of the liquid in the gas-liquid separator, effectively preventing the liquid level in the gas-liquid separator from being too high, and improving the startup reliability of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 is a schematic structural diagram of a refrigeration system according to embodiment 1 of the present invention;

[0049] Figure 2 is a schematic structural diagram of a refrigeration system according to a second embodiment of the present invention;

[0050] Figure 3 1 is a schematic structural diagram of Example 3 of the gas-liquid separator of the present invention (single float liquid level gauge);

[0051] Figure 4 1 is a schematic structural diagram of Example 4 of the gas-liquid separator of the present invention (multi-float liquid level gauge);

[0052] Figure 5 1 is a schematic structural diagram of Example 5 of the gas-liquid separator of the present invention (magnetic switches are connected in series);

[0053] Figure 6 It is a structural diagram of Example 6 of the gas-liquid separator of the present invention (magnetic switches are connected in parallel).

[0054] The reference numerals indicate:

[0055] 1. Shell; 1a. Upper shell; 1b. Lower shell; 100. Liquid level detection device; 2. Floating member; 21. Floating member 1; 22. Floating member 2; 7. First limit member; 71. First limit member 1; 72. First limit member 2; 8. Second limit member; 81. Second limit member 1; 82. Second limit member 2; 200. Heating device; 3. Switch structure; 4. Power cord; 5. Heating element; 6. Casing; 9. Signal line; 10. Exhaust pipe; 11. Inlet pipe; 300. Gas-liquid separator; 12. Compressor; 13. Condenser; 14. Liquid storage tank; 15. Evaporator; 16. Throttle valve; 17. One-way valve; 18. Fluorine pump; 19. Solenoid valve; 20. One-way valve A. DETAILED DESCRIPTION

[0056] like Figure 1-6 As shown, the present invention provides a refrigeration system, which includes:

[0057] The gas-liquid separator 300 includes a shell 1, a liquid level detection device 100 and a heating device 200. The shell 1 can contain gas and / or liquid. The liquid level detection device 100 is arranged inside the shell 1 and can detect the liquid level height of the liquid. The heating device 200 is arranged in the shell 1 and can heat the liquid. The liquid level detection device 100 and the heating device 200 are integrated into one. The liquid level detection device 100 can control the heating device 200 to heat or not according to the height of the liquid level.

[0058] The present invention provides a liquid level detection device and a heating device disposed inside the shell of the gas-liquid separator. The liquid level detection device can be used to detect the height of the liquid level, and the heating device can be used to heat the liquid. The present invention creatively integrates the liquid level detection device and the heating device into one body, and the heating device is controlled to be turned on or off according to the liquid level detected by the liquid level detection device. When the liquid level is high, the heating device can be automatically turned on to heat the liquid. When the liquid level is high, the liquid level can be lowered by heating the liquid, effectively reducing the amount of liquid inside the gas-liquid separator, preventing excessive accumulation of refrigerant liquid, avoiding affecting the startup reliability of the compressor, and effectively preventing liquid hammer in the compressor. When the liquid level is low, the heating device is automatically controlled to be turned off by the liquid level detection device, thereby preventing the liquid level from being too low, reducing the power of the heating device, and improving the energy efficiency of the refrigeration system. Therefore, the present invention can automatically control whether the refrigerant liquid accumulated inside the gas-liquid separator is heated and vaporized according to the height of the liquid in the gas-liquid separator, effectively preventing the liquid level in the gas-liquid separator from being too high, and improving the startup reliability of the compressor.

[0059] The invention is characterized by the following points: 1. The invention uses a gas-liquid separator equipped with a liquid level gauge and electric heating functions. The liquid level gauge is used to determine the level of accumulated liquid in the gas-liquid separator, thereby activating electric heating to heat and vaporize excess accumulated liquid; 2. The magnetic switch of the liquid level gauge added to the gas-liquid separator can be connected in series with the power line of the electric heater, thereby automatically controlling the electric heating to heat and vaporize excess accumulated liquid in the gas-liquid separator;

[0060] 3. The magnetic switch of the newly added liquid level gauge in the gas-liquid separator is connected in parallel with the power line of the electric heater. It can feed back the liquid level change signal in the gas-liquid separator to the control system. The control system can adjust the heating power and duration of the electric heater according to the rate of liquid level change.

[0061] The beneficial effects are as follows:

[0062] 1. Prevent excessive accumulation of refrigerant liquid in the gas-liquid separator to ensure the safety of compressor startup or sufficient refrigerant quantity during fluorine pump heat pipe refrigeration operation;

[0063] 2. Automatic control can be achieved to eliminate excessive liquid accumulation. The residual lubricating oil after the refrigerant is vaporized is retained in the gas-liquid separator, which is conducive to replenishing the lubricating oil as soon as possible when the compressor starts.

[0064] The following technical problems have been solved:

[0065] 1. Excessive accumulation of refrigerant liquid in the gas-liquid separator can easily affect the startup reliability of the compressor. How to eliminate the problem of excessive liquid accumulation in the gas-liquid separator before starting?

[0066] 2. In the fluorine pump heat pipe mode, prevent excessive refrigerant liquid from accumulating in the gas-liquid separator, which is detrimental to the operation of the fluorine pump. How to eliminate the problem of excessive liquid accumulation in the gas-liquid separator.

[0067] In some embodiments, a compressor 12, a condenser 13, a liquid storage tank 14, an evaporator 15 and a throttle valve 16 are further included. The compressor 12, the condenser 13, the liquid storage tank 14, the throttle valve 16, the evaporator 15 and the gas-liquid separator 300 constitute a compression cycle system.

[0068] Example 1, as Figure 1 In some embodiments, the refrigeration system further includes a one-way valve 17, a fluorine pump 18 and a solenoid valve 19. The throttle valve 16 is connected between the liquid storage tank 14 and the evaporator 15. The solenoid valve 19 is connected in series with the fluorine pump 18 and then arranged in parallel at both ends of the throttle valve 16. The one-way valve 17 is arranged in parallel at both ends of the series connection of the compressor 12 and the gas-liquid separator 300. The fluorine pump 18, the solenoid valve 19, the evaporator 15, the one-way valve 17, the condenser 13 and the liquid storage tank 14 constitute a fluorine pump circulation system.

[0069] Example 2, as Figure 2 The refrigeration system also includes a one-way valve 17, a fluorine pump 18 and a one-way valve A20. The throttle valve 16 and the fluorine pump 18 are connected in series and connected between the liquid storage tank 14 and the evaporator 15. The one-way valve A20 is arranged in parallel at both ends of the fluorine pump 18. The one-way valve 17 is arranged in parallel at both ends of the compressor 12 and the gas-liquid separator 300 connected in series. The fluorine pump 18, the throttle valve 16, the evaporator 15, the one-way valve 17, the condenser 13 and the liquid storage tank 14 constitute a fluorine pump circulation system.

[0070] like Figure 1 and Figure 2 As shown in the diagram, the differences between the two embodiments are: 1) the number of float balls in the internal liquid level gauge of the gas-liquid separator is different, that is, the number of signal lines in the connecting line is different, which is reflected in the different control technology solutions in this proposal; 2) the setting relationship between the throttle valve and the fluorine pump is different. Figure 1 The fluorine pump is connected in parallel and a solenoid valve is connected in series on the pipeline. Figure 2 A series connection relationship is adopted, and a one-way valve A with the same flow direction as the fluorine pump is provided in parallel at the inlet and outlet of the fluorine pump.

[0071] In some embodiments, the liquid level detection device 100 includes a float 2, which can float on the liquid surface and rise and fall with the liquid surface. The heating device 200 includes a switch structure 3, a power cord 4, and a heating element 5. The power cord 4 is connected to the heating element 5 so that the heating element 5 generates heat to heat the liquid. The switch structure 3 can control the on and off of the power cord 4, and the switch structure 3 can be controlled by the float 2 to be turned on or off. This is a preferred structural form of the liquid level detection device of the present invention. The float can effectively float on the liquid surface inside the gas-liquid separator and can effectively detect the height of the liquid level. The heating device includes a power cord and a heating element, which can heat the liquid by being energized to generate heat, thereby lowering the liquid level. The switch structure can control the on and off of the power cord, thereby automatically controlling whether the heating element is heated according to the height of the liquid level, thereby preventing excessive accumulation of liquid inside the shell and improving the startup reliability of the compressor.

[0072] In some embodiments, when the float 2 detects that the liquid level has risen above a preset height, the switch structure 3 opens, thereby controlling the power cord 4 to be energized, thereby energizing the heating element 5 and heating the liquid. When the float 2 detects that the liquid level has fallen below a preset height, the switch structure 3 closes, thereby controlling the power cord 4 to be de-energized, thereby de-energizing the heating element 5 and preventing the liquid from being heated. This is a preferred form of coordination between the float and the switch structure of the present invention, i.e., the float detects the liquid level. If the level is high, the switch structure automatically opens to heat the liquid, thereby lowering the liquid level. If the level is low, the switch structure automatically closes to stop heating, thereby reducing electrical power and improving the energy efficiency of the system.

[0073] In some embodiments, the heating device 200 further includes a sleeve 6, the power cord 4 and the heating element 5 are both disposed inside the sleeve 6, the floating member 2 is sleeved on the outside of the sleeve 6, and the floating member 2 can slide up and down on the sleeve 6. The heating device of the present invention further includes a sleeve structure, which can be used to dispose the power cord and the heating element inside the sleeve, and the floating member is sleeved on the outside of the sleeve, forming a structure in which the liquid level detection device and the heating device are integrated. The floating member, power cord, and heating element are integrated into the sleeve, effectively achieving the structural effect of integrating liquid level detection and heating.

[0074] In some embodiments, the floating member 2 is a float, and the switch structure 3 is a magnetic switch, which is located inside the casing 6. This is a preferred structural form of the floating member and the switch structure of the present invention, and the magnetic switch of the present invention is preferably located inside the casing, further integrating the switch structure with the floating member, the casing, and other structures.

[0075] like Figure 3 and Figure 4 As shown, a conventional gas-liquid separator comprises at least a container cylinder, comprising an upper shell and a lower shell. Typically, an inlet and outlet pipes extend from the top of the upper shell. The outlet pipe is designed as a U-shape within the cylinder, with oil return holes and a filter assembly located on the sides of the U-shaped bottom. The inlet pipe is typically a bent component within the cylinder, allowing centrifugal separation of the gas-liquid mixture after it enters the cylinder. Sealing connections between the upper and lower shells, between the inlet pipe and the upper shell, and between the outlet pipe and the upper shell are typically achieved through welding.

[0076] Based on the above existing gas-liquid separator, the present invention adds a float level gauge and electric heating function. The casing is divided into two straight sections and one spiral section ( Figure 3 and Figure 4The spiral section of the sleeve is not shown, and only the heating element is shown at the corresponding position). After the heating element is installed in the sleeve, heat-conducting material, such as thermal grease, is filled between the heating element and the spiral section. The two ends of the heating element are connected to the power cord, which is respectively placed in the straight pipe sections of the two sleeves and led out from the pipe mouth to the outside of the gas-liquid separator. The middle part with the heating element and thermal grease built in is made into a spiral section by a spiral processing process, which is a mature manufacturing process; the two ends of the spiral section are respectively connected to the straight pipe section, and the other end of the straight pipe section extends out of the upper shell and is sealed with the upper shell (for example, by welding sealing); the power cord and / or signal line extends out from the pipe mouth of the straight pipe section of the sleeve for connection, feedback and control with the electric control box. The power cord and signal line are collectively referred to as connecting lines.

[0077] like Figure 3 , Example 3, in some embodiments, the liquid level detection device 100 further includes a first limit member 7 and a second limit member 8, the first limit member 7 and the second limit member 8 are both fixed to the outer periphery of the sleeve, and the first limit member 7 is located below the floating member 2 so as to limit the lowest position of the downward movement of the floating member 2, and the second limit member 8 is located above the floating member 2 so as to limit the highest position of the upward movement of the floating member 2. The present invention can effectively limit the extreme positions of the up and down movement of the floating member through the structure of the first limit member and the second limit member, preventing the floating member from moving too high upward and being far away from the magnetic switch, resulting in the inability to control the magnetic switch, and also effectively preventing the floating member from moving too low downward and being far away from the magnetic switch, resulting in the inability to control the magnetic switch, thereby ensuring that the control relationship between the floating member and the magnetic switch remains effective.

[0078] The straight pipe section of one of the sleeves of the present invention is also designed to have the function of a float level gauge. A magnetic switch is fixed inside the straight pipe section, and the float of the float level gauge is sleeved on the outside of the straight pipe section of the sleeve equipped with the magnetic switch. A retaining ring is provided on the outside of the straight pipe section of the sleeve corresponding to the upper position and / or lower position of the magnetic switch, and the retaining ring is used to limit the movement of the float. Under the buoyancy of the liquid, the float moves up and down along the straight pipe section of the sleeve. When the liquid level rises, the float rises, and when the liquid level drops, the float drops, but it will be restricted by the retaining ring and cannot continue to rise or drop. The movement of the float causes a position change, which causes a relative position change between the float and the internal magnetic switch, thereby realizing the opening and closing action of the magnetic switch.

[0079] In some embodiments, the vertical height of the switch structure 3 corresponds to that of the floating member 2, and the vertical height of the switch structure 3 is located between the first limiter 7 and the second limiter 8. The vertical position of the switch structure of the present invention should correspond to that of the floating member and be located between the first and second limiters, thereby maintaining a continuous and effective control relationship between the floating member and the switch structure, through which the floating member can always control the switch structure.

[0080] like Figure 4 , Example 4, in some embodiments, the floating member 2 includes a floating member 21 and a floating member 22, the floating member 21 and the floating member 22 are arranged at different height positions on the sleeve 6, and the height of the floating member 22 is higher than the height of the floating member 21, the switch structure 3 includes a switch structure 1 and a switch structure 2, the switch structure 1 is arranged corresponding to the floating member 21 and can be opened or closed by the height control of the floating member 21, the switch structure 2 is arranged corresponding to the floating member 22 and can be opened or closed by the height control of the floating member 22.

[0081] This is the preferred structural form of Example 2 of the present invention. Through more than two floating structures of floating parts one and two, and the switch structures one and two matched therewith, a further preferred control profile for the liquid level in the vertical direction can be formed. Whether the power is on or not can be controlled by the floating part one and switch structure one below. The change in the size of the heating power can be controlled by the floating part two and switch structure two above. In addition, the average speed of the liquid level rise can be detected and calculated by the two floating parts and the two switch structures, so as to control the heating power to change according to the size of the speed. For example, if the liquid level rise speed is high, the heating power increases, thereby reducing the liquid level rise speed. If the rise speed is low, the heating power can remain unchanged or decrease, thereby ensuring precise control of the liquid level rise speed.

[0082] Figure 3 It is a single float level gauge. The liquid level change inside the gas-liquid separator can be determined by the opening and closing of the magnetic switch. Figure 4 It can also determine the degree of change in the liquid level: when the magnetic switch A (structural switch one) corresponding to float A (floating part one) is actuated, it can be determined that the liquid level has reached height A; when the magnetic switch B (structural switch two) corresponding to float B (floating part two) is actuated, it can be determined that the liquid level has reached height B. The rate of liquid accumulation can be calculated based on the change time of the two liquid level heights, thereby controlling the heating power and duration of the heating element.

[0083] In some embodiments, when the first floating member 21 detects that the liquid level has risen above a first preset height, the first switch structure is opened, thereby controlling the power cord 4 to be energized, and the heating element 5 to be energized to heat the liquid; when the second floating member 22 detects that the liquid level has risen above a second preset height, the second switch structure is opened, thereby controlling the power cord 4 to increase the current power, and the heating power of the heating element 5 to be increased; the second preset height is higher than the first preset height;

[0084] When the floating part 22 detects that the liquid level drops below the preset height 2, the switch structure 2 is closed, the power cord 4 is controlled to reduce the current power, and the heating element 5 reduces the heating power; when the floating part 1 21 detects that the liquid level drops below the preset height 1, the switch structure 1 is closed, the power cord 4 is controlled to cut off the power, and the heating element 5 is cut off and does not heat the liquid.

[0085] This is the preferred structural coordination form between the floating parts 1 and 2 and the switch structures 1 and 2 of the present invention. The floating part 1 and the switch structure 1 can be used to control the opening or closing of the heating element, and the floating part 2 and the switch structure 2 can be used to control the size of the heating power of the heating element, thereby being able to accurately control the height of the liquid level to further prevent the accumulation of liquid refrigerant due to excessive liquid level, thereby improving the reliability of the compressor startup.

[0086] In some embodiments, when the liquid level detection device 100 further includes a first limiter 7 and a second limiter 8:

[0087] The first limiting member 7 also includes a first limiting member 71 and a first limiting member 72, and the second limiting member 8 also includes a second limiting member 81 and a second limiting member 82. The first limiting member 71 is located below the floating member 21 to limit the lowest position of the downward movement of the floating member 21, and the second limiting member 81 is located above the floating member 21 to limit the highest position of the upward movement of the floating member 21; the first limiting member 72 is located below the floating member 22 to limit the lowest position of the downward movement of the floating member 22, and the second limiting member 82 is located above the floating member 22 to limit the highest position of the upward movement of the floating member 22.

[0088] Embodiment 4 of the present invention further preferably includes two first limit members, namely a first limit member 1 and a first limit member 2, the first limit member 1 is located below the floating member 1 to limit the bottom of the floating member 1, the first limit member 2 is located below the floating member 2 to limit the bottom of the floating member 2, the second limit member 1 is located above the floating member 1 to limit the top of the floating member 1, and the second limit member 2 is located above the floating member 2 to limit the top of the floating member 2, so as to ensure that the floating member 1 and the floating member 2 maintain a continuous and effective control relationship with the switch structures 1 and 2 respectively.

[0089] In some embodiments, the vertical height of the switch structure 1 is located between the first limiter 1 71 and the second limiter 1 81; the vertical height of the switch structure 2 is located between the first limiter 2 72 and the second limiter 2 82. The heights of the switch structures 1 and 2 of the present invention, respectively, located between the first and second limiters 1, can ensure that the switch structure 1 maintains a magnetic connection with the floating member 1, and that the switch structure 2 maintains a magnetic connection with the floating member 2.

[0090] In some embodiments, the height difference between the first preset height and the second preset height can be detected and calculated, the time difference between the sequential opening of the first switch structure and the second switch structure can be detected and calculated, and the speed of the liquid level rise can be calculated. The present invention can effectively calculate the rising speed of the liquid level from the first float to the second float by using the height difference between the first preset height and the second preset height, as well as the time difference between the opening of the first switch structure and the second switch structure. This allows for effective control of the heating power based on this rising speed. A higher rising speed increases the heating power, thereby effectively controlling the liquid level from rising too high or decreasing it as quickly as possible, further ensuring that the liquid level does not rise too high.

[0091] like Figure 5 , Example 5, in some embodiments, the switch structure 3 is arranged in series with the power cord 4, and the power on and off of the power cord 4 can be controlled by opening and closing the switch structure 3, so that the power cord 4 is energized when the switch structure 3 is turned on, and the power cord 4 is de-energized when the switch structure 3 is closed. This is the preferred connection method between the switch structure and the power cord of Example 3 of the present invention, that is, the switch structure is arranged in series on the power cord, and the power on and off of the power cord can be directly controlled by opening and closing the switch structure. The float close to the spiral heating element is set at a distance H1 from the upper position of the spiral heating element, and the uppermost float is at a distance H2 from the bottom float. As Figure 5 As shown, the magnetic switch can be set in series with the power line of the heating element; Figure 6 As shown, the magnetic switch can also be set to connect the signal line separately, and the power line and the signal line are collectively referred to as the connecting line.

[0092] like Figure 6 In Example 6, the switch structure 3 is arranged in parallel with the power line 4. The switch structure 3 is electrically connected to a signal line 9. The opening and closing of the switch structure 3 can control the signal line 9 to output different signals, thereby controlling the on and off of the power line 4 through the signal line 9. When the switch structure 3 is open, the power line 4 is energized, and when the switch structure 3 is closed, the power line 4 is de-energized. This is the preferred connection method between the switch structure and the power line of Example 4 of the present invention, that is, the switch structure is arranged in parallel with the power line, and can output signals through the signal line by opening and closing the switch structure, and further output signals through the signal line to control the on and off of the power line.

[0093] In some embodiments, the heating element 5 has a spiral structure, and the sleeve portion that cooperates with the heating element 5 also has a spiral structure. A thermally conductive material is provided between the heating element 5 and the sleeve 6. The housing 1 has a split structure and includes an upper housing and a lower housing that are connected. The gas-liquid separator also includes an air inlet pipe 11 and an air outlet pipe 10. The heating element of the present invention preferably has a spiral structure to increase the heating area. The provision of a thermally conductive material between the heating element and the sleeve can improve the heat conduction effect between the heating element and the sleeve, further enhancing the heating intensity of the liquid and improving the liquid level control effect.

[0094] The present invention also provides a control method for the aforementioned refrigeration system, comprising:

[0095] Detection step, detecting the liquid level by the liquid level detection device 100;

[0096] a judging step of judging whether the liquid level is higher than a preset height;

[0097] Control step: when it is detected that the liquid level rises to above a preset height, the heating device 200 is turned on and heats the liquid; when it is detected that the liquid level drops to below a preset height, the heating device 200 is turned off and does not heat the liquid.

[0098] This is the control method of the refrigeration system of the present invention, which can automatically turn on the heating device to heat the liquid when the liquid level is high, so that when the liquid level is high, the liquid level height can be lowered by heating the liquid, effectively reducing the amount of liquid inside the gas-liquid separator, preventing the occurrence of excessive accumulation of refrigerant liquid, avoiding affecting the startup reliability of the compressor, and effectively preventing liquid hammer in the compressor; when the liquid level is low, the heating device will be automatically controlled to be turned off by the liquid level detection device, thereby preventing the liquid level from being too low, reducing the power of the heating device, and improving the energy efficiency of the refrigeration system. Therefore, the present invention can automatically control whether the refrigerant liquid accumulated inside the gas-liquid separator is heated and vaporized according to the height of the liquid in the gas-liquid separator, effectively preventing the liquid level in the gas-liquid separator from being too high, and improving the startup reliability of the compressor.

[0099] In some embodiments, when the liquid level detection device 100 includes a floating member 2 that can float on the liquid surface and rise and fall with the liquid surface, and the heating device 200 includes a switch structure 3, a power cord 4, and a heating element 5:

[0100] a detection step of detecting the liquid level by the floating member 2;

[0101] a judging step of judging whether the liquid level is higher than a preset height;

[0102] The control step is as follows: when it is detected that the liquid level rises to above a preset height, the switch structure 3 is opened, the power cord 4 is controlled to be energized, the heating element 5 is energized and heats the liquid; when it is detected that the liquid level drops to below a preset height, the switch structure 3 is closed, the power cord 4 is controlled to be deenergized, the heating element 5 is deenergized and does not heat the liquid.

[0103] The multifunctional gas-liquid separator of the present invention has two types of liquid level gauges: single float and double float. There are also two electrical connection modes: the magnetic switch is set in series with the power line or in parallel with the power line. Therefore, the present invention describes the control method in four cases.

[0104] 1. The magnetic switch of the single float level gauge is connected in series with the electric heater

[0105] The rising liquid level causes the float to move upward, triggering the internal magnetic switch to operate, allowing the power cord of the electric heater to be connected and the electric heater to automatically begin heating the liquid in the gas-liquid separator. When the amount of refrigerant being heated and vaporized is greater than the amount of liquid refrigerant entering the gas-liquid separator, the liquid level drops, causing the float to move downward, triggering the internal magnetic switch to operate again, disconnecting the power cord of the electric heater and automatically stopping heating, thereby ensuring that the accumulated liquid in the gas-liquid separator is kept at a controllable level. When the amount of refrigerant being heated and vaporized is less than the amount of liquid refrigerant entering the gas-liquid separator, the liquid level continues to rise and heating continues. After time t1, the electric heater current is increased to n1 times the original current to continue heating and vaporization. After time t2, the heating current is increased again by n2 times... until the liquid level and the float drop, triggering the magnetic switch to disconnect the power cord, completing the heating and vaporization to control the liquid level. When the liquid level continues to be higher than the preset level for more than a preset time, the power can be increased to allow the liquid level to drop as quickly as possible, thereby accurately controlling the liquid level and preventing it from rising too quickly or too high, and controlling the liquid level at the required lower level position.

[0106] In some embodiments, the detecting step further detects the duration t during which the liquid level rises above a preset height;

[0107] The judging step comprises judging the relationship between the duration t and the preset times t1 and t2;

[0108] The control step is as follows: when t>t1, the power of the power line 4 is controlled to increase to n1 times the original power; when t>t2, the power of the power line 4 is controlled to increase to n2 times the original power, wherein t1 and t2 are both constants and t2>t1>0, and n1 and n2 are both constants n2>n1>0.

[0109] 2. The magnetic switch of the single float level gauge is connected in parallel with the electric heater

[0110] The working principle is similar to that of 1) above. Since the magnetic switches are arranged in parallel and have independent control signal lines, the opening or closing signal of the magnetic switches is transmitted to the control component. The control component controls the power line of the electric heater and / or controls the current of the electric heater according to the signal fed back by the magnetic switch, thereby controlling the liquid level of the accumulated liquid in the gas-liquid separator to be at a controllable level.

[0111] When the amount of refrigerant heated and vaporized is larger than the amount of liquid refrigerant entering the gas-liquid separator, the liquid level drops, causing the float to move downward, triggering the internal magnetic switch to operate again. After receiving the signal, the control component disconnects the power supply of the electric heater, and the electric heater automatically stops heating, thereby ensuring that the accumulated liquid in the gas-liquid separator is at a controllable level; when the amount of refrigerant heated and vaporized is smaller than the amount of liquid refrigerant entering the gas-liquid separator, the liquid level continues to rise and heating continues. After t1 time exceeds, the current of the electric heater is increased to n1 times the original to continue heating and vaporization. After t2 time exceeds, the heating current is increased by n2 times... until the liquid level and the float drop, triggering the magnetic switch to disconnect. After receiving the signal, the control component disconnects the power supply of the electric heater, completing the heating and vaporization to control the liquid level.

[0112] 3. The magnetic switch of the double float level gauge is connected in series and in parallel with the electric heater

[0113] In some embodiments, when the floating member 2 includes a floating member 1 21 and a floating member 22, the floating member 1 21 and the floating member 2 22 are arranged at different heights on the casing 6, and the height of the floating member 2 22 is higher than that of the floating member 1 21, the switch structure 3 includes a switch structure 1 and a switch structure 2, the switch structure 1 is arranged corresponding to the floating member 1 21 and can be opened or closed by the height control of the floating member 1 21, and the switch structure 2 is arranged corresponding to the floating member 22 and can be opened or closed by the height control of the floating member 22;

[0114] The detection step is to detect a preset height 1 at which the floating member 1 21 opens the switch structure 1 as the liquid level rises, and to detect a preset height 2 at which the floating member 2 22 opens the switch structure 2 as the liquid level rises, and to detect a time difference △t between the opening of the switch structure 1 and the opening of the switch structure 2; wherein the preset height 2 is higher than the preset height 1;

[0115] The calculation step is to calculate a height difference △H between the preset height 2 and the preset height 1, and to calculate a liquid level change rate v = △H / △t.

[0116] The control step is to adjust the current multiple of the heating device to k according to the magnitude of the liquid level change rate v, where k is a preset parameter, and k increases when v increases, and k remains unchanged or decreases when v decreases.

[0117] In some embodiments, k is related to the interval where the v value is located. When 0 < v < 1 cm / min, k = 1.5; when 1 ≤ v < 3 cm / min, k = 2; when v ≥ 3 cm / min, k = 3.

[0118] Through the preferred control form of the double-float structure, the present invention can accurately calculate the average speed of the liquid level rise, and thus control the change of the heating power according to the speed. For example, if the speed exceeds the preset speed, the power is increased; if the speed is less than the preset speed, the power can be decreased or remain unchanged, so that the liquid level rise speed is reduced or the liquid level no longer rises, and finally the liquid level is lowered, so that the liquid level can be quickly lowered, thereby accurately controlling the liquid level, preventing the liquid level from rising too fast or too high, and controlling the liquid level at a required lower liquid level position.

[0119] Since the double-float liquid level switch has two magnetic switches, only the lowermost magnetic switch needs to be connected in series to the power supply line of the electric heater, and the signal line of the other high-position magnetic switch is connected in parallel with the power supply line of the electric heater and then connected to the control component.

[0120] When the low-level magnetic switch acts, it connects the power supply line of the electric heater, and the electric heater automatically starts to heat the liquid refrigerant to achieve gasification. When the amount of the heated and vaporized refrigerant is larger than the amount of the liquid refrigerant entering the gas-liquid separator, the liquid level drops, causing the floating ball to move downward, triggering the internal magnetic switch to act again, then the power supply line of the electric heater is disconnected, and the electric heater automatically stops heating, thereby ensuring that the accumulated liquid in the gas-liquid separator is at a controllable level.

[0121] When the amount of refrigerant vaporized by heating is smaller than the amount of liquid refrigerant entering the gas-liquid separator, the liquid level continuously rises and heating continues. The rising liquid level drives the upper float to move upward, thereby triggering the upper magnetic switch to act. The control component receives the change in the signal of the upper magnetic switch, and the time difference △t between the change and the change of the lower magnetic switch can be calculated. Since the distance △H between the lower magnetic switch and the upper magnetic switch is fixed, the liquid level change rate v = △H / △t can be calculated. According to the magnitude of the liquid level change rate, the current multiple of the electric heater is adjusted and increased to k, where k is a preset parameter and k is related to the interval where the v value is located.

[0122] When 0 < v < 1 cm / min, k = 1.5; when 1 ≤ v < 3 cm / min, k = 2; when v ≥ 3 cm / min, k = 3.

[0123] 4. The magnetic switches of the double-float liquid level gauge are connected in parallel to the electric heater

[0124] The working principle is similar to that of item 3 above. Because the magnetic switches are connected in parallel and have independent control signal lines (lower magnetic switch signal line, upper magnetic switch signal line), the signals of the opening or closing of the magnetic switches are transmitted to the control component. The control component controls the conduction of the power supply line of the electric heater and / or the magnitude of the current of the electric heater according to the signals fed back by the magnetic switches, so as to control the liquid level of the accumulated liquid in the gas-liquid separator to be at a controllable level.

[0125] When the amount of refrigerant vaporized by heating is larger than the amount of liquid refrigerant entering the gas-liquid separator, the liquid level drops, causing the lower float to move downward, triggering the internal lower magnetic switch to act again. After receiving the signal, the control component disconnects the power supply of the electric heater, and the electric heater automatically stops heating, so as to ensure that the accumulated liquid in the gas-liquid separator is at a controllable level.

[0126] When the amount of refrigerant vaporized by heating is smaller than the amount of liquid refrigerant entering the gas-liquid separator, the liquid level continuously rises and heating continues. The rising liquid level drives the upper float to move upward, thereby triggering the upper magnetic switch to act. The control component receives the change in the signal of the upper magnetic switch, and the time difference △t between the change and the change of the lower magnetic switch can be calculated. Since the distance △H between the lower magnetic switch and the upper magnetic switch is fixed, the liquid level change rate v = △H / △t can be calculated. According to the magnitude of the liquid level change rate, the current multiple of the electric heater is adjusted and increased to k, where k is a preset parameter and k is related to the interval where the v value is located.

[0127] When 0 < v < 1 cm / min, k = 1.5; when 1 ≤ v < 3 cm / min, k = 2; when v ≥ 3 cm / min, k = 3.

[0128] The above four control schemes also have the following two common characteristics and control schemes of the control component:

[0129] A) Depending on the structure of the float level switch and the type of signal line, the control unit can select the corresponding control method mentioned above to match it. The selection in the control unit can be achieved by using the dial switch on the hardware or by the factory preset value of the background software;

[0130] B) The compressor is allowed to start only when the liquid level in the gas-liquid separator is lower than the controllable level, that is, when the low-level magnetic switch is disconnected and the electric heater stops working.

[0131] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A refrigeration system, characterized in that: include: A gas-liquid separator (300), comprising a housing (1), a liquid level detection device (100) and a heating device (200); the housing (1) is capable of containing gas and / or liquid; the liquid level detection device (100) is arranged inside the housing (1) and is capable of detecting the liquid level; the heating device (200) is arranged inside the housing (1) and is capable of heating the liquid; the liquid level detection device (100) and the heating device (200) are integrated into one body; the liquid level detection device (100) is capable of controlling the heating device (200) to heat or not heat according to the liquid level; The liquid level detection device (100) includes a floating member (2), the floating member (2) can float on the liquid surface and float up and down with the liquid surface; the heating device (200) includes a switch structure (3), a power line (4) and a heating element (5); the power line (4) is connected to the heating element (5) so as to heat the liquid through the heat generated by the heating element (5); the switch structure (3) can control the power on and off of the power line (4), and the switch structure (3) can be controlled by the floating member (2) to be opened or closed; The heating device (200) further comprises a sleeve (6), the power line (4) and the heating element (5) are both arranged inside the sleeve (6), the floating member (2) is sleeved outside the sleeve (6), and the floating member (2) can slide up and down on the sleeve (6); The floating member (2) includes a floating member 1 (21) and a floating member 2 (22), the floating member 1 (21) and the floating member 2 (22) are arranged at different heights on the sleeve (6), and the height of the floating member 2 (22) is higher than the height of the floating member 1 (21), the switch structure (3) includes a switch structure 1 and a switch structure 2, the switch structure 1 is arranged corresponding to the floating member 1 (21) and can be opened or closed by the height control of the floating member 1 (21), and the switch structure 2 is arranged corresponding to the floating member 2 (22) and can be opened or closed by the height control of the floating member 2 (22); a detection step, detecting that the first floating member (21) opens the first switch structure at a preset height 1 as the liquid level rises, and detecting that the second floating member (22) opens the second switch structure at a preset height 2 as the liquid level rises, and detecting a time difference Δt between the opening of the first switch structure and the opening of the second switch structure; wherein the second preset height is higher than the first preset height; Calculation steps: calculate the height difference △H between the preset height 2 and the preset height 1, and calculate the liquid level change rate v=△H / △t, The control step is to adjust and increase the current multiple of the heating device to k according to the size of the liquid level change rate v, where k is a preset parameter. When v increases, k is controlled to increase, and when v decreases, k is controlled to remain unchanged or decrease.

2. The refrigeration system according to claim 1, characterized in that: The invention also includes a compressor (12), a condenser (13), a liquid storage tank (14), an evaporator (15) and a throttle valve (16). The compressor (12), the condenser (13), the liquid storage tank (14), the throttle valve (16), the evaporator (15) and the gas-liquid separator (300) constitute a compression cycle system.

3. The refrigeration system according to claim 2, wherein: The refrigeration system further includes a one-way valve (17), a fluorine pump (18) and a solenoid valve (19); the throttle valve (16) is connected between the liquid storage tank (14) and the evaporator (15); the solenoid valve (19) is connected in series with the fluorine pump (18) and then arranged in parallel at both ends of the throttle valve (16); the one-way valve (17) is arranged in parallel at both ends of the series connection of the compressor (12) and the gas-liquid separator (300); the fluorine pump (18), the solenoid valve (19), the evaporator (15), the one-way valve (17), the condenser (13) and the liquid storage tank (14) constitute a fluorine pump circulation system; Alternatively, the refrigeration system further comprises a one-way valve (17), a fluorine pump (18) and a one-way valve A (20); the throttle valve (16) and the fluorine pump (18) are connected in series and are connected between the liquid storage tank (14) and the evaporator (15); the one-way valve A (20) is arranged in parallel at both ends of the fluorine pump (18); the one-way valve (17) is arranged in parallel at both ends of the series connection of the compressor (12) and the gas-liquid separator (300); the fluorine pump (18), the throttle valve (16), the evaporator (15), the one-way valve (17), the condenser (13) and the liquid storage tank (14) constitute a fluorine pump circulation system.

4. The refrigeration system according to claim 1, wherein: When the floating member (2) detects that the liquid level rises to a level higher than a preset height, the switch structure (3) opens, thereby controlling the power cord (4) to be energized, and the heating element (5) to be energized and heat the liquid; when the floating member (2) detects that the liquid level drops to a level lower than a preset height, the switch structure (3) closes, thereby controlling the power cord (4) to be de-energized, and the heating element (5) to be de-energized and not to heat the liquid.

5. The refrigeration system according to claim 1, wherein: The floating member (2) is a floating ball, the switch structure (3) is a magnetic switch, and the magnetic switch is located inside the sleeve (6).

6. The refrigeration system according to claim 1, wherein: The liquid level detection device (100) further includes a first limiting member (7) and a second limiting member (8), wherein the first limiting member (7) and the second limiting member (8) are both fixed to the outer periphery of the sleeve (6), and the first limiting member (7) is located below the floating member (2) so as to limit the lowest position of the downward movement of the floating member (2), and the second limiting member (8) is located above the floating member (2) so as to limit the highest position of the upward movement of the floating member (2).

7. The refrigeration system according to claim 6, characterized in that: The height of the switch structure (3) in the vertical direction corresponds to that of the floating member (2), and the height of the switch structure (3) in the vertical direction is located between the first limiting member (7) and the second limiting member (8).

8. The refrigeration system according to claim 1, wherein: When the floating member 1 (21) detects that the liquid level rises to a level higher than the preset height 1, the switch structure 1 is opened, thereby controlling the power cord (4) to be energized, and the heating element (5) to be energized and heat the liquid; when the floating member 2 (22) detects that the liquid level rises to a level higher than the preset height 2, the switch structure 2 is opened, thereby controlling the power cord (4) to increase the current power, and the heating power of the heating element (5) to be increased; the preset height 2 is higher than the preset height 1; When the second floating member (22) detects that the liquid level drops below the second preset height, the second switch structure is closed, the power line (4) is controlled to reduce the current power, and the heating element (5) reduces the heating power; when the first floating member (21) detects that the liquid level drops below the first preset height, the first switch structure is closed, the power line (4) is controlled to cut off the power, and the heating element (5) is cut off and does not heat the liquid.

9. The refrigeration system according to claim 1, wherein: When the liquid level detection device (100) further includes a first limiting member (7) and a second limiting member (8): The first limiting member (7) further includes a first limiting member 1 (71) and a first limiting member 2 (72), and the second limiting member (8) further includes a second limiting member 1 (81) and a second limiting member 2 (82). The first limiting member 1 (71) is located below the floating member 1 (21) so as to limit the lowest position of the downward movement of the floating member 1 (21), and the second limiting member 1 (81) is located above the floating member 1 (21) so as to limit the highest position of the upward movement of the floating member 1 (21); the first limiting member 2 (72) is located below the floating member 2 (22) so as to limit the lowest position of the downward movement of the floating member 2 (22), and the second limiting member 2 (82) is located above the floating member 2 (22) so as to limit the highest position of the upward movement of the floating member 2 (22).

10. The refrigeration system according to claim 9, characterized in that: The vertical height of the switch structure 1 is located between the first limiting member 1 (71) and the second limiting member 1 (81); the vertical height of the switch structure 2 is located between the first limiting member 2 (72) and the second limiting member 2 (82).

11. The refrigeration system according to claim 8, wherein: The height difference between the preset height 1 and the preset height 2 can be detected and calculated, the time difference between the sequential opening of the switch structure 1 and the switch structure 2 can be detected and calculated, and the speed of the liquid level rise can be calculated.

12. The refrigeration system according to any one of claims 1 to 11, characterized in that: The switch structure (3) is arranged in series with the power line (4), and can control the power on and off of the power line (4) by opening and closing the switch structure (3), so that when the switch structure (3) is opened, the power line (4) is energized, and when the switch structure (3) is closed, the power line (4) is de-energized; Alternatively, the switch structure (3) is arranged in parallel with the power line (4), and the switch structure (3) is electrically connected to the signal line (9), and can control the signal line (9) to output different signals by opening and closing the switch structure (3), and then control the power line (4) to be on and off by the signal line (9), so that when the switch structure (3) is opened, the power line (4) is energized, and when the switch structure (3) is closed, the power line (4) is de-energized.

13. The refrigeration system according to any one of claims 1 to 11, characterized in that: The heating element (5) is a spiral structure, and the sleeve portion that cooperates with the heating element (5) is also a spiral structure. A heat-conducting material is provided between the heating element (5) and the sleeve (6); the shell (1) is a split structure and includes an upper shell and a lower shell that are connected to each other. The gas-liquid separator also includes an air inlet pipe (11) and an air outlet pipe (10).

14. A method for controlling a refrigeration system according to any one of claims 1 to 13, characterized in that: include: a detection step, detecting the liquid level by means of the liquid level detection device (100); a judging step of judging whether the liquid level is higher than a preset height; A control step, when it is detected that the liquid level rises to above a preset height, the heating device (200) is turned on and heats the liquid; when it is detected that the liquid level drops to below the preset height, the heating device (200) is turned off and does not heat the liquid; a detection step, detecting the liquid level by means of the floating member (2); a judging step of judging whether the liquid level is higher than a preset height; The control step is as follows: when it is detected that the liquid level rises to a level higher than a preset height, the switch structure (3) is opened, the power line (4) is controlled to be energized, the heating element (5) is energized and the liquid is heated; when it is detected that the liquid level drops to a level lower than the preset height, the switch structure (3) is closed, the power line (4) is controlled to be de-energized, the heating element (5) is de-energized and the liquid is not heated; The detecting step detects the preset height 1 at which the first floating member (21) opens the first switch structure as the liquid level rises, and detects the preset height 2 at which the second floating member (22) opens the second switch structure as the liquid level rises, and detects the time difference Δt between the opening of the first switch structure and the opening of the second switch structure; wherein the preset height 2 is higher than the preset height 1; Calculation step: Calculate the height difference ΔH between the preset height two and the preset height one, and calculate the liquid level change rate v = ΔH / Δt. The control step: Adjust the current multiple of the heating device to k according to the magnitude of the liquid level change rate v, where k is a preset parameter. When v increases, control k to increase; when v decreases, control k to remain unchanged or decrease.

15. The control method according to claim 14, wherein: The detection step: Also detect the duration t when the liquid level rises above the preset height. The judgment step: Judge the relationship between the duration t and the preset times t1 and t2. The control step: When t > t1, control the power of the power line (4) to increase to n1 times the original power; when t > t2, control the power of the power line (4) to increase to n2 times the original power, where t1 and t2 are both constants and t2 > t1 > 0, and n1 and n2 are both constants and n2 > n1 > 0.

16. The control method according to claim 14, wherein: k is related to the interval where the v value is located. When 0 < v < 1 cm / min, k = 1.5; when 1 ≤ v < 3 cm / min, k = 2; when v ≥ 3 cm / min, k = 3.

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