Rotating disc type isobaric filling equipment for carbonated beverage production

Abstract

The invention belongs to the technical field of beverage filling, and particularly relates to rotating disc type isobaric filling equipment for carbonated beverage production, which comprises a filling machine, a rotating disc, a pressure detection module, a PLC (programmable logic controller) control module, a pneumatic execution module and a liquid level detection module, the liquid pipe connector and the gas pipe connector are used for being connected with the gas storage tank and the liquid storage tank respectively, a gas inlet pipe and a liquid inlet pipe are arranged in a filling head of the filling machine and communicated with the gas pipe connector and the liquid pipe connector respectively, an electromagnetic valve and a flow valve are installed on the liquid inlet pipe, and a gas return pipe is arranged on the side of the filling head and used for being connected with the gas storage tank. According to the system, the pressure detection module monitors the pressure of the liquid storage tank, the container and the air return pipe in real time, the opening degree of the air valve and the opening degree of the liquid valve are adjusted in combination with control logic preset by the PLC control module, pressure balance is accurately maintained according to a pressure balance formula, stable isobaric filling is achieved, bubbles are effectively reduced, and the beverage quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of beverage filling, in particular to a rotary isobaric filling device for producing carbonated beverages. Background Art

[0002] At present, the filling machines on the filling production line of carbonated beverages generally adopt isobaric filling technology, the purpose of which is to prevent the gas contained in the material from overflowing during the filling process and ensure the stability of product quality. Isobaric filling is a canning method that first inflates the packaging container under conditions higher than atmospheric pressure to make it equal to the air pressure in the liquid storage tank, and then relies on the dead weight of the liquid to flow into the packaging container.

[0003] Traditional filling equipment has many problems. For example, unstable pressure control leads to a large number of bubbles during the filling process, which affects the taste and quality of the beverage. Liquid level detection is not accurate enough, and inconsistent filling volume often occurs, resulting in material waste and uneven product quality. Therefore, corresponding improvements are made to address this problem. Summary of the invention

[0004] Based on the technical problems existing in the prior art, the present invention proposes a rotary isobaric filling equipment for the production of carbonated beverages.

[0005] The present invention provides a turntable isobaric filling equipment for carbonated beverage production, comprising a filling machine, a turntable, a pressure detection module, a PLC control module, a pneumatic execution module and a liquid level detection module. The filling machine is connected to a bottom plate through a lifting mechanism, and the turntable is connected to the bottom plate through a driving mechanism. A liquid pipe joint and an air pipe joint are fixed to the bottom of the filling machine, and the liquid pipe joint and the air pipe joint are used to connect an air storage tank and a liquid storage tank, respectively. An air inlet pipe and a liquid inlet pipe are arranged in the filling head of the filling machine, and the air inlet pipe and the liquid inlet pipe are connected to the air pipe joint and the liquid pipe joint, respectively. A solenoid valve and a flow valve are installed on the liquid inlet pipe. There is an air return pipe on the side of the filling head, which is used to connect to the gas storage tank; place the container in the corresponding bottle slot, and adjust the filling position by driving the turntable through the driving mechanism, and then the lifting mechanism will drive the filling machine to move downward until the filling head docks with the container bottle mouth, and then the filling machine will fill the liquid beverage into the container. During this process, the pressure detection module monitors the pressure of the liquid storage tank, container and air return pipe in real time, the liquid level detection module detects the liquid level in the container in real time, and the PLC control module adjusts the opening of the air valve and the liquid valve through the preset control logic to calmly maintain the pressure balance and perform isobaric filling.

[0006] Preferably, the pneumatic execution module includes an inflation valve, an air return pipe and a pressure relief valve, the inflation valve is installed on the air inlet pipe, and the air return pipe and the pressure relief valve are respectively installed on the side of the filling head; in this way, inflation can be controlled by the inflation valve, air return can be achieved through the air return pipe, and deflation can be performed through the pressure relief valve.

[0007] Preferably, the lifting mechanism comprises a lifting frame fixed on the top of the bottom plate, a slider is slidably connected to the lifting frame, and the filling machine is fixed on the slider; in this way, the slider can be driven up and down by the lifting frame, thereby controlling the lifting action of the filling machine.

[0008] Preferably, the driving mechanism includes a servo motor fixed on the top of the base plate, the servo motor output shaft is fixedly connected to the second gear, the first gear is fixedly sleeved on the shaft of the turntable, and the first gear is meshingly connected with the second gear; in this way, the second gear can be driven to rotate by the servo motor output shaft, and then the turntable can be driven to rotate by the second gear meshing with the first gear, thereby realizing the adjustment of the filling station.

[0009] Preferably, there are three pressure detection modules, which are respectively located inside the liquid storage tank, the filling head and the return air pipe, and there are two liquid level detection modules, which are an ultrasonic sensor and a capacitive sensor. The ultrasonic sensor is located inside the filling head, and the capacitive sensor is embedded in the wall of the return air pipe.

[0010] Preferably, a sealing ring for wrapping the mouth of the container is fixed at the bottom pipe mouth of the filling head; this can improve the sealing between the filling head and the container.

[0011] Preferably, a plurality of electric push rods distributed in a circular array are fixed on the top of the turntable, and the output shafts of the electric push rods are fixedly connected to a clamping plate, the cross-section of the clamping plate is in the shape of a "large" character, and the clamping plate is located above the corresponding bottle slot; after the container is placed in the bottle slot, the output shaft of the electric push rod will drive the clamping plate to move to the side close to the container, and then fix the container.

[0012] Preferably, the PLC control module adjusts the opening of the gas valve and the liquid valve through a preset control logic to maintain pressure balance, and the control logic includes the following steps: Step 1: Inflation and isobaric stage Control logic: The pressure detection module monitors the pressure in the liquid storage tank, container and return air pipe in real time. ,like , fill the container with CO2 or compressed air through the filling valve until

[0013] Step 2: Liquid inlet and gas return stage Control logic: Liquid level detection module detects liquid level , adjust the liquid flow rate through the flow valve , the pressure of the return pipe The pressure must be kept consistent with the liquid storage tank to prevent bubbles from forming.

[0014] Step 3: Stop feeding Control logic: When When the solenoid valve is closed, the liquid flow is cut off.

[0015] Step 4: Pressure Release Phase Control logic: Reduce the pressure in stages via the pressure relief valve until ≈atmospheric pressure.

[0016] Preferably, the pressure balance formula is: in, : Gas pressure in the liquid storage tank pa, Gas pressure in container (Pa), Liquid density (kg / , : Gravity acceleration (9.8m / , Liquid level height (m); Temperature compensation: Since the solubility of CO2 is affected by temperature, a temperature sensor is set in the filling head to monitor the temperature in real time, and then the formula (k is a constant) Dynamically adjust the pressure setting value to improve the accuracy of the calculation results; The liquid flow formula is: in, : Liquid volume flow m³ / s, Flow coefficient (related to valve shape, usually 0.6~0.8), Valve opening area ( ; The filling time estimation formula is:

[0017] in, Filling time(s), : Container volume m³; The PLC control module executes the PID algorithm to adjust the opening of the gas valve and the liquid valve to maintain pressure balance. The formula of the PID algorithm is: in, , , : PID control parameters.

[0018] Preferably, the collaborative control logic of the ultrasonic sensor and the capacitive sensor is: First, the rough adjustment stage (liquid level 80%-90%) The ultrasonic sensor monitors the liquid level in real time and dynamically adjusts the flow rate through the flow valve to avoid overflow; Second, fine adjustment stage (liquid level ) The capacitive sensor detects whether the return pipe nozzle is in contact with liquid, and the flow valve is closed when triggered (response time , ensuring accurate filling quantity.

[0019] Compared with the prior art, the present invention provides a rotary isobaric filling equipment for carbonated beverage production, which has the following beneficial effects: 1. A rotary isobaric filling equipment for carbonated beverage production, which monitors the pressure of liquid storage tanks, containers and return air pipes in real time through the pressure detection module, adjusts the opening of gas valves and liquid valves in combination with the control logic preset by the PLC control module, and accurately maintains pressure balance according to the pressure balance formula to achieve stable isobaric filling, effectively reduce bubble generation, and ensure beverage quality.

[0020] 2. A turntable isobaric filling equipment for carbonated beverage production. Ultrasonic sensors and capacitive sensors work together. In the coarse adjustment stage, the ultrasonic sensor dynamically adjusts the flow rate to avoid overflow. In the fine adjustment stage, the capacitive sensor accurately controls the filling volume to ensure accurate filling liquid level and reduce material waste.

[0021] 3. A rotary isobaric filling equipment for carbonated beverage production. The PLC control module executes the PID algorithm to accurately adjust the opening of the gas valve and liquid valve according to real-time data such as pressure and liquid level. At the same time, it considers the effect of temperature on CO2 solubility to adjust the dynamic pressure setting value, thereby improving the intelligence level and filling accuracy of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a circuit schematic diagram of a rotary isobaric filling device for carbonated beverage production proposed by the present invention; Figure 2 This is a schematic diagram of the overall structure of a rotary isobaric filling equipment for carbonated beverage production proposed by the present invention; Figure 3 A schematic diagram of the turntable structure of a turntable isobaric filling equipment for carbonated beverage production proposed by the present invention; Figure 4 This is a schematic structural diagram of a filling machine from a first angle of a rotary isobaric filling device for carbonated beverage production proposed by the present invention; Figure 5 A schematic diagram of the internal structure of a filling head of a rotary isobaric filling device for producing carbonated beverages proposed by the present invention; Figure 6 This is a schematic diagram of the turntable bottom structure of a turntable isobaric filling equipment for carbonated beverage production proposed by the present invention; Figure 7 This is a schematic structural diagram from a second angle of a filling machine of a rotary table isobaric filling equipment for producing carbonated beverages proposed by the present invention.

[0023] In the figure: 1. bottom plate; 2. lifting frame; 3. filling machine; 4. turntable; 5. bottle slot; 6. liquid pipe joint; 7. air pipe joint; 8. air inlet pipe; 9. liquid inlet pipe; 10. filling head; 11. solenoid valve; 12. flow valve; 13. inflation valve; 14. return air pipe; 15. pressure relief valve; 16. pressure detection module; 17. liquid level detection module; 18. PLC control module; 19. first gear; 20. servo motor; 21. second gear; 22. slider; 23. sealing ring; 24. electric push rod; 25. clamp. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] Reference Figure 1-Figure 7 A rotary isobaric filling device for carbonated beverage production includes a filling machine 3, a rotary table 4, a pressure detection module 16, a PLC control module 18, a pneumatic execution module and a liquid level detection module 17. The filling machine 3 is connected to the bottom plate 1 through a lifting mechanism, and the rotary table 4 is connected to the bottom plate 1 through a driving mechanism. A liquid pipe joint 6 and an air pipe joint 7 are fixed at the bottom of the filling machine 3. The liquid pipe joint 6 and the air pipe joint 7 are used to connect the gas storage tank and the liquid storage tank respectively. The filling head 10 of the filling machine 3 is provided with an air inlet pipe 8 and The liquid inlet pipe 9, the air inlet pipe 8 and the liquid inlet pipe 9 are connected to the air pipe joint 7 and the liquid pipe joint 6 respectively. The liquid inlet pipe 9 is installed with a solenoid valve 11 and a flow valve 12. The side of the filling head 10 is provided with a return air pipe 14, and the return air pipe 14 is used to connect the gas storage tank. The pressure detection module 16 is used to monitor the pressure of the liquid storage tank, the container and the return air pipe 14 in real time. The liquid level detection module 17 is used to detect the liquid level in the container in real time. The PLC control module 18 adjusts the opening of the gas valve and the liquid valve through the preset control logic to maintain the pressure balance; When in use, place the container in the corresponding bottle slot 5, and adjust the filling position by driving the turntable 4 to rotate through the driving mechanism, then the lifting mechanism will drive the filling machine 3 to move downward until the filling head 10 docks with the bottle mouth of the container, and then the filling machine 3 will fill the liquid beverage into the container. During this process, the pressure detection module 16 monitors the pressure of the liquid storage tank, the container and the return air pipe 14 in real time, the liquid level detection module 17 detects the liquid level in the container in real time, and the PLC control module 18 adjusts the opening of the air valve and the liquid valve through the preset control logic to calmly maintain the pressure balance and perform isobaric filling.

[0027] Furthermore, the pneumatic actuator module includes an air charging valve 13, an air return pipe 14 and a pressure relief valve 15, the air charging valve 13 is installed on the air inlet pipe 8, and the air return pipe 14 and the pressure relief valve 15 are respectively installed on the side of the filling head 10; When in use, the inflation can be controlled by the inflation valve 13 , the return of air can be achieved through the return pipe 14 , and the deflation can be carried out through the pressure relief valve 15 .

[0028] Furthermore, the lifting mechanism includes a lifting frame 2 fixed on the top of the bottom plate 1, a slider 22 is slidably connected to the lifting frame 2, and the filling machine 3 is fixed on the slider 22; When in use, the lifting frame 2 can drive the slider 22 to move up and down, thereby controlling the lifting action of the filling machine 3.

[0029] Furthermore, the driving mechanism includes a servo motor 20 fixed on the top of the bottom plate 1, the output shaft of the servo motor 20 is fixedly connected with a second gear 21, and a first gear 19 is fixedly sleeved on the shaft of the turntable 4, and the first gear 19 is meshed and connected with the second gear 21; When in use, the output shaft of the servo motor 20 can drive the second gear 21 to rotate, and then the second gear 21 can engage with the first gear 19 to drive the turntable 4 to rotate, thereby achieving adjustment of the filling station.

[0030] Furthermore, three pressure detection modules 16 are provided, which are respectively located inside the liquid storage tank, the filling head 10 and the return air pipe, and two liquid level detection modules 17 are provided, which are an ultrasonic sensor and a capacitive sensor. The ultrasonic sensor is located inside the filling head 10, and the capacitive sensor is embedded on the wall of the return air pipe 14; It should be noted that the pressure detection module 16 may be a pressure sensor or other equipment capable of real-time monitoring of the pressure of the liquid storage tank, the container and the return air pipe 14. The pressure detection module 16 is not specifically limited here and may be selected according to actual needs. The above collaborative control logic of ultrasonic sensors and capacitive sensors is as follows: First, the rough adjustment stage (liquid level 80%-90%) The ultrasonic sensor monitors the liquid level in real time and dynamically adjusts the flow rate through the flow valve 12 to avoid overflow; Second, fine adjustment stage (liquid level

[0031] The capacitive sensor detects whether the return pipe 14 is in contact with liquid, and the flow valve 12 is closed when it is triggered (response time , ensuring accurate filling quantity.

[0032] Furthermore, a sealing ring 23 for wrapping the mouth of the container is fixed at the bottom of the filling head 10; When in use, this can improve the sealing between the filling head 10 and the container.

[0033] Furthermore, a plurality of electric push rods 24 distributed in a circular array are fixed on the top of the turntable 4, and the output shaft of the electric push rod 24 is fixedly connected with a clamping plate 25, the cross section of the clamping plate 25 is a "large" shape, and the clamping plate 25 is located above the corresponding bottle slot 5; When in use, after placing the container into the bottle groove 5, the output shaft of the electric push rod 24 will drive the clamping plate 25 to move to the side close to the container, and then fix the container.

[0034] Furthermore, the PLC control module 18 adjusts the opening of the gas valve and the liquid valve through a preset control logic to maintain pressure balance. The control logic includes the following steps: Step 1: Inflation and isobaric stage Objective: To balance the pressure in the liquid storage tank with that in the container (usually 0.3~0.4MPa).

[0035] Control logic: The pressure detection module 16 monitors the pressure in the liquid storage tank, the container and the return air pipe 14 in real time. ,like , fill the container with CO2 or compressed air through the filling valve 13 until

[0036] Step 2: Liquid inlet and gas return stage Objective: Liquid flows into the container under the action of gravity, while gas is discharged through the return pipe 14.

[0037] Control logic: Liquid level detection module 17 detects liquid level height , adjust the liquid flow rate through the flow valve 12 , the pressure of the return pipe 14 The pressure must be kept consistent with the liquid storage tank to prevent bubbles from forming.

[0038] Step 3: Stop feeding Trigger condition: the liquid level reaches a preset height (usually determined by the position of the return air pipe 14).

[0039] Control logic: When When , the solenoid valve 11 is closed to cut off the flow of liquid.

[0040] Step 4: Pressure Release Phase Goal: To slowly release the residual pressure in the container and avoid a sudden drop in pressure that could cause CO2 to escape.

[0041] Control logic: The pressure is reduced in stages via the pressure relief valve 15 until ≈atmospheric pressure.

[0042] Furthermore, the pressure balance formula is: in, : Gas pressure in the liquid storage tank (Pa), Gas pressure in container (Pa), Liquid density (kg / , : Gravity acceleration (9.8m / , Liquid level height (m); Temperature compensation: Since the solubility of CO2 is affected by temperature, a temperature sensor is set in the filling head 10 to monitor the temperature in real time, and then the formula (k is a constant) Dynamically adjust the pressure setting value to improve the accuracy of the calculation results; The liquid flow formula is: in, : Liquid volume flow m³ / s, Flow coefficient (related to valve shape, usually 0.6~0.8), Valve opening area ( ; The filling time estimation formula is:

[0043] in, Filling time(s), : Container volume (m³); The PLC control module 18 executes the PID algorithm to adjust the opening of the gas valve and the liquid valve to maintain pressure balance. The formula of the PID algorithm is: in, , , : PID control parameters.

[0044] The above formula is a formula obtained by collecting a large amount of data and performing software simulation to obtain the most recent real situation. The preset parameters in the formula are set by technicians in this field according to actual conditions.

[0045] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0046] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0047] In the several embodiments provided in the present application, it should be understood that the disclosed overall system, device and method can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another overall system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0048] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0049] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0050] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A rotary table isobaric filling device for producing carbonated beverages, comprising a filling machine (3), a rotary table (4), a pressure detection module (16), a PLC control module (18), a pneumatic execution module and a liquid level detection module (17), characterized in that: The filling machine (3) is connected to the bottom plate (1) via a lifting mechanism, the turntable (4) is connected to the bottom plate (1) via a driving mechanism, a liquid pipe joint (6) and an air pipe joint (7) are fixed to the bottom of the filling machine (3), the liquid pipe joint (6) and the air pipe joint (7) are used to connect to an air storage tank and a liquid storage tank respectively, an air inlet pipe (8) and a liquid inlet pipe (9) are arranged in a filling head (10) of the filling machine (3), the air inlet pipe (8) and the liquid inlet pipe (9) are connected to the air pipe joint (7) and the liquid pipe joint (6) respectively, a solenoid valve (11) and a flow valve (12) are installed on the liquid inlet pipe (9), a return air pipe (14) is arranged on the side of the filling head (10), the return air pipe (14) is used to connect to an air storage tank, and a PLC control module (18) adjusts the opening of the air valve and the liquid valve through a preset control logic to maintain pressure balance.

2. A rotary table isobaric filling equipment for carbonated beverage production according to claim 1, characterized in that: The pneumatic execution module comprises an air charging valve (13), an air return pipe (14) and a pressure relief valve (15); the air charging valve (13) is mounted on the air inlet pipe (8), and the air return pipe (14) and the pressure relief valve (15) are respectively mounted on the sides of the filling head (10).

3. The rotary table isobaric filling equipment for carbonated beverage production according to claim 1, characterized in that: The lifting mechanism comprises a lifting frame (2) fixed on the top of the bottom plate (1), a slider (22) is slidably connected to the lifting frame (2), and the filling machine (3) is fixed on the slider (22).

4. The rotary table isobaric filling equipment for carbonated beverage production according to claim 1, characterized in that: The driving mechanism comprises a servo motor (20) fixed on the top of the base plate (1); the output shaft of the servo motor (20) is fixedly connected to a second gear (21); a first gear (19) is fixedly sleeved on the shaft of the rotating disk (4); and the first gear (19) is meshingly connected to the second gear (21).

5. The rotary table isobaric filling equipment for carbonated beverage production according to claim 1, characterized in that: The pressure detection modules (16) are provided in three pieces and are respectively located inside the liquid storage tank, the filling head (10) and the air return pipe. The liquid level detection modules (17) are provided in two pieces, which are an ultrasonic sensor and a capacitive sensor. The ultrasonic sensor is located inside the filling head (10) and the capacitive sensor is embedded in the wall of the air return pipe (14).

6. The rotary table isobaric filling equipment for carbonated beverage production according to claim 1, characterized in that: A sealing ring (23) for tightly wrapping the mouth of the container is fixed at the bottom pipe mouth of the filling head (10).

7. The rotary table isobaric filling equipment for carbonated beverage production according to claim 2, characterized in that: A plurality of electric push rods (24) distributed in a circular array are fixed on the top of the turntable (4); the output shafts of the electric push rods (24) are fixedly connected to a clamping plate (25); the cross section of the clamping plate (25) is in the shape of a "big" character; the clamping plate (25) is located above the corresponding bottle slot (5).

8. The rotary table isobaric filling equipment for carbonated beverage production according to claim 2, characterized in that: The PLC control module (18) adjusts the opening of the gas valve and the liquid valve through a preset control logic to maintain pressure balance. The control logic includes the following steps: In the first step, the pressure detection module (16) monitors the pressures in the liquid storage tank, the container and the return air pipe (14) in real time. ,like , fill the container with CO2 or compressed air through the filling valve (13) until ; Step 2: Liquid level detection module (17) detects liquid level , adjust the liquid flow rate through the flow valve (12) , the pressure of the return pipe (14) The pressure must be kept consistent with the liquid storage tank to prevent bubbles from forming; Step 3: When When the solenoid valve (11) is closed, the flow of liquid is cut off; Step 4: Reduce the pressure in stages through the pressure relief valve (15) until ≈atmospheric pressure.

9. The rotary table isobaric filling equipment for carbonated beverage production according to claim 8, characterized in that: The pressure balance formula is: in, : Gas pressure in the liquid storage tank, The gas pressure in the container, Liquid density, : acceleration due to gravity, Liquid level; The liquid flow formula is: in, : Liquid volume flow rate, Flow coefficient, Valve opening area; The filling time estimation formula is: ; in, Filling time, : Container capacity.

10. The rotary table isobaric filling equipment for carbonated beverage production according to claim 5, characterized in that: The collaborative control logic of the ultrasonic sensor and the capacitive sensor is: First, the rough adjustment stage (liquid level 80%-90%) The ultrasonic sensor monitors the liquid level in real time and dynamically adjusts the flow rate through the flow valve (12) to avoid overflow; Second, fine adjustment stage (liquid level ) The capacitive sensor detects whether the outlet of the return air pipe (14) contacts the liquid, and when triggered, closes the flow valve (12), thereby ensuring accurate filling quantity.

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