A volumetric device

Abstract

This application relates to the field of measuring instruments and discloses a volume control device, including a volume control chamber, a reagent chamber, and a controller. The reagent chamber is connected to the volume control chamber via a power pump and delivers liquid to the chamber. The volume control component includes a level sensor and a rangefinder. The measuring electrode of the level sensor is placed inside the volume control chamber, and the rangefinder is positioned above the chamber and used to emit a laser beam into the chamber. The level sensor and rangefinder measure the liquid level data within the volume control chamber. The controller is connected to the power pump and the volume control component and receives the liquid level data measured by the volume control component to start and stop the power pump. The volume control device significantly improves the accuracy and automation level of liquid volume control. The complementary data from the level sensor and rangefinder ensures accurate liquid level detection. The controller intelligently starts and stops the power pump, preventing overfilling or underfilling, reducing liquid waste and the risk of manual intervention, thereby improving overall efficiency and reliability.

Description

Technical Field

[0001] This application belongs to the field of measuring instrument technology, and specifically relates to a volume control device. Background Technology

[0002] In liquid volumetric / quantitative operations in the chemical, biological, and pharmaceutical fields, current technologies primarily employ a separate approach. Manual volumetric dosing relies on the operator visually observing the meniscus formed by the graduation marks on the volumetric flask to determine the endpoint. Automated or semi-automated methods, on the other hand, commonly use a weighing method, employing electronic balances and PLC-controlled valves, or single-beam laser ranging, to measure the liquid level and achieve quantitative liquid addition.

[0003] These methods all have significant limitations. Manual operation is susceptible to subjective judgment and visual differences, leading to inaccurate positioning of the meniscus and resulting in volume errors. Among mechanical methods, the weighing method is extremely sensitive to environmental vibrations, while the single-beam laser ranging method cannot compensate for the liquid height measurement deviation caused by the meniscus, both affecting the accuracy of volume determination. In addition, personnel may directly come into contact with organic solvents and highly toxic samples during operation, posing multiple safety hazards. Therefore, there is an urgent need to develop a high-precision automatic volume determination device to solve the above problems. Summary of the Invention

[0004] In view of at least one of the above-mentioned defects or deficiencies in the prior art, this application provides a volume-regulating device that achieves automatic and high-precision volume regulation.

[0005] To achieve the above objectives, this application provides a volume-regulating device, the volume-regulating device comprising:

[0006] Constant volume chamber;

[0007] The reagent chamber is connected to the volumetric chamber via a power pump and supplies liquid to the volumetric chamber.

[0008] A volume-regulating assembly includes a liquid level sensor and a rangefinder. The measuring electrode of the liquid level sensor is placed inside the volume-regulating chamber, and the rangefinder is positioned above the volume-regulating chamber and is used to emit a laser beam into the volume-regulating chamber. The liquid level sensor and the rangefinder are used to measure the liquid level data inside the volume-regulating chamber.

[0009] A controller, connected to the power pump and the volume control assembly, is used to receive liquid level data measured by the volume control assembly and to start and stop the power pump.

[0010] In some embodiments, the rangefinder includes two laser emitters for emitting laser beams into the interior of the volumetric chamber, one of which is aligned with the center of the liquid surface in the volumetric chamber, and the other is aligned with the junction of the inner wall of the volumetric chamber and the liquid surface.

[0011] In some embodiments, the rangefinder is disposed outside the fixed-volume chamber, and the top cover of the fixed-volume chamber is a transparent top cover for the laser beam to pass through.

[0012] In some embodiments, the volume-fixing chamber is a transparent chamber, and the outer wall of the volume-fixing chamber has scale lines.

[0013] In some embodiments, the constant-volume chamber has a sealed cavity for holding liquid, and the measuring electrode is housed within the sealed cavity and passes through the constant-volume chamber to be connected to the processor of the liquid level sensor.

[0014] In some embodiments, the volume-regulating device further includes:

[0015] An air ultrasonic generator structure, which is U-shaped and surrounds the outer periphery of the fixed-volume chamber, is used to send ultrasonic waves to the fixed-volume chamber.

[0016] In some embodiments, the volume-regulating device further includes:

[0017] The bracket has one end connected to the rangefinder and the other end connected to the air ultrasonic generator structure. The bracket is used to support the rangefinder.

[0018] In some embodiments, the air ultrasonic generator is electrically connected to the controller, which is used to start and stop the air ultrasonic generator based on the liquid level data.

[0019] In some embodiments, the bottom of the constant volume chamber is also provided with a drain port and a drain valve, the drain valve being used to open and close the drain port.

[0020] In some embodiments, the drain valve is connected to the controller, which is used to start and stop the drain valve.

[0021] Through the above technical solutions, the volume control device significantly improves the accuracy and automation level of liquid capacity control. By using a redundant measurement mechanism of liquid level sensor and rangefinder, the liquid level sensor provides direct contact real-time feedback, while the rangefinder uses a laser beam to enhance the accuracy of high-level measurement and avoid errors caused by foam or vibration interference. The complementary data from both ensures the accuracy of liquid level detection. At the same time, the controller intelligently starts and stops the power pump based on accurate data, preventing the liquid from being too full or too empty, reducing liquid waste and the risk of manual intervention, thereby improving overall efficiency and reliability.

[0022] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0023] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0024] Figure 1 This is a schematic diagram of the volume-regulating device in this utility model;

[0025] Figure 2 This is a schematic diagram of the connection of the controller in this utility model;

[0026] Explanation of reference numerals in the attached figures

[0027] Detailed Implementation

[0028] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0029] The present application will now be described in detail with reference to the accompanying drawings and exemplary embodiments.

[0030] like Figure 1As shown, this utility model provides a volume-fixing device, including a volume-fixing chamber 1, a reagent chamber 2, and a controller 7. The reagent chamber 2 is connected to the volume-fixing chamber 1 via a power pump 3 and delivers liquid to the volume-fixing chamber 1. The volume-fixing component 4 includes a liquid level sensor 41 and a rangefinder 42. The measuring electrode 41a of the liquid level sensor 41 is placed inside the volume-fixing chamber 1, and the rangefinder 42 is positioned above the volume-fixing chamber 1 and is used to emit a laser beam into the volume-fixing chamber 1. The liquid level sensor 41 and the rangefinder 42 are used to measure the liquid level data inside the volume-fixing chamber 1. The controller 7 is connected to the power pump 3 and the volume-fixing component 4. The controller 7 is used to receive the liquid level data measured by the volume-fixing component 4 and start and stop the power pump 3.

[0031] The volumetric chamber 1 is used to store and measure liquids; the reagent chamber 2 is directly connected to the volumetric chamber 1 via the power pump 3, and is responsible for storing the original liquid and injecting it into the volumetric chamber 1 under the drive of the power pump 3; the volumetric component 4 integrates a liquid level sensor 41 and a rangefinder 42. The measuring electrode 41a of the liquid level sensor 41 is placed directly inside the volumetric chamber 1 and in contact with the liquid to monitor the liquid level changes in real time, while the rangefinder 42 is installed above the volumetric chamber 1 and emits a laser beam vertically into the chamber to supplement the measurement data by non-contact detection of liquid surface reflection; the controller 7 is the coordination center of the entire system. It is connected to the power pump 3, the liquid level sensor 41 and the rangefinder 42 through circuits, receives the liquid level data stream from the volumetric component 4 in real time, and dynamically starts and stops the power pump 3 according to the preset liquid level threshold to realize closed-loop control of the liquid injection process.

[0032] Through the close cooperation of the above structures, the volume control device of this utility model significantly improves the accuracy and automation level of liquid capacity control. Through the redundant measurement mechanism of liquid level sensor 41 and rangefinder 42, liquid level sensor 41 provides direct contact real-time feedback, and rangefinder 42 uses a laser beam to enhance the accuracy of high-level measurement, avoiding errors caused by foam or vibration interference. The complementary data of the two ensures the accuracy of liquid level detection. At the same time, the controller 7 intelligently starts and stops the power pump 3 based on accurate data, preventing the liquid from being too full or too insufficient, reducing liquid waste and the risk of manual intervention, thereby improving overall efficiency and reliability.

[0033] In some embodiments, the rangefinder 42 includes two laser emitters 421, which emit laser beams into the volumetric chamber 1. One laser emitter 421 is aligned with the center of the liquid surface inside the volumetric chamber 1, and the other laser emitter 421 is aligned with the interface between the inner wall of the volumetric chamber 1 and the liquid surface. The two laser emitters 421 are precisely positioned above the volumetric chamber 1. One emitter is vertically aligned with the center of the liquid surface inside the volumetric chamber 1, so that its emitted laser beam can be perpendicularly incident on the central region of the free liquid surface; the other emitter is adjusted so that its emitted laser beam is precisely aligned with the interface between the inner wall of the volumetric chamber 1 and the upper surface of the liquid. This interface region typically contains a meniscus formed by the contact between the liquid and the container wall. The controller 7 simultaneously receives the signal data reflected back from the two laser emitters 421 through independent channels, and calculates the height of the central liquid surface and the liquid surface position information of the edge critical zone, respectively.

[0034] The central laser beam provides direct height measurement of the flattest liquid surface area, unaffected by the container wall, reducing the impact of potential eddies or local fluctuations within the container on the main liquid level reading. Another laser beam targets the interface between the container wall and the liquid surface, accurately capturing and quantifying the meniscus shape and height formed by liquid surface tension and wettability. This allows the rangefinder 42 to more accurately determine the true effective liquid level, especially at critical points where the level is close to the target value or requires extremely high precision, as the meniscus effect is a significant source of systematic error in the edge region for the contact level sensor 41 and single-point laser measurement. The dual-point measurement data provides the controller 7 with more comprehensive and reliable information. On one hand, the two data points can be compared and verified; on the other hand, in the final stage of precise liquid control, the controller 7 can combine or prioritize the boundary measurements for more accurate judgment and control, thereby significantly improving the absolute accuracy of the entire volume-keeping process and the reliability of the endpoint determination.

[0035] In some embodiments, the rangefinder 42 is disposed outside the constant-volume chamber 1, and the top cover of the constant-volume chamber 1 is a transparent top cover for the laser beam to pass through. The rangefinder 42 is integrally mounted on the outside of the constant-volume chamber 1, without direct contact with the internal liquid or gas environment, and the top cover of the constant-volume chamber 1 is made of optical-grade transparent material with high light transmittance. The transparent top cover ensures the airtightness of the chamber while forming a physical isolation layer. The laser beam output by the laser emitter 421 penetrates vertically through the top cover into the internal space of the chamber, and after being reflected by the liquid surface, the reflected light then penetrates back through the top cover and returns to the receiving module of the rangefinder 42, realizing non-contact measurement.

[0036] This combination of external integration and a transparent top cover isolates the rangefinder 42 from the cabin environment, preventing sensor components from being contaminated, corroded, or affected by pressure, significantly improving long-term stability and service life. The cabin top cover adopts an integrated transparent structure to ensure unobstructed optical paths and eliminate leakage points, thereby achieving fully enclosed operation while maintaining high-precision control, ensuring process safety and measurement reliability.

[0037] In some embodiments, the volumetric chamber 1 is a transparent chamber with graduation lines on its outer wall. The volumetric chamber 1 can be made of transparent materials, such as optical glass or high-strength polymers, and physical graduation lines are precisely machined or etched on its outer wall. This graduation line system runs through the expected liquid level range of the chamber, providing operators with a direct visual reference for volume or height. The transparent chamber and graduation lines constitute an indispensable manual verification and redundancy guarantee mechanism. Operators or maintenance engineers can directly and quickly confirm the actual position of the liquid inside the chamber visually without relying on complex electronic equipment. This not only provides immediate and intuitive on-site judgment during system startup, calibration, or abnormal debugging, such as verifying the correctness of the initial readings of automatic sensors, but also adds a layer of safety to the entire system. In the event of a malfunction or inaccuracy of sensors or controllers 7 in the electronic control system, the graduation lines provide the most basic liquid level indication, allowing users to intervene manually and avoid safety accidents caused by misoperation, greatly enhancing the overall reliability and fault tolerance of the system.

[0038] In some embodiments, the constant-volume chamber 1 has a sealed cavity for holding liquid. The measuring electrode 41a is housed within the sealed cavity and passes through the constant-volume chamber 1 to connect with the processor 41b of the liquid level sensor 41. The constant-volume chamber 1 is a closed, sealed cavity. The chamber itself, including its inlet, outlet, and top cover, are all connected by reliable seals (such as O-rings and gaskets) to ensure that the internal cavity can be effectively isolated from the external environment, forming an airtight or liquid-tight sealed space specifically for safely holding various liquids. Simultaneously, the measuring electrode 41a of the liquid level sensor 41 is directly built into the sealed cavity, completely immersed in the liquid environment being measured. The tail end of the measuring electrode 41a extends outward through the chamber wall and connects to the processor 41b of the liquid level sensor 41 outside the constant-volume chamber 1. This ensures a complete signal channel is established between the measuring electrode 41a and the processor 41b while maintaining the integrity of the seal of the constant-volume chamber 1. The sealed cavity is a key foundation for safety and process control. It can safely contain volatile and corrosive liquids, preventing harmful vapors from escaping and polluting the environment or posing a hazard to operators, and providing a stable and controllable space for the entire volume determination process. By directly immersing the measuring electrode 41a into the liquid being measured, the true electrical characteristics of the liquid can be sensed in real time. This overcomes the shortcomings of non-contact measurement, which may be affected by bubbles, foam, or liquid surface refraction, thus improving the stability and accuracy of the core liquid level data. The measuring electrode 41a and the processor 41b are connected separately, keeping the processor 41b away from the liquid environment to avoid corrosion or contamination, significantly extending the system life and reducing maintenance difficulty.

[0039] In some embodiments, the volume-regulating device further includes an air ultrasonic generator structure 5, which is U-shaped and surrounds the outer periphery of the volume-regulating chamber 1. The air ultrasonic generator structure 5 is used to transmit ultrasonic waves to the volume-regulating chamber 1. The air ultrasonic generator structure 5 is designed in a U-shape or near-annular shape to tightly conform to the curved outer wall of the volume-regulating chamber 1, particularly the central main body of a cylindrical or rectangular container, completely or largely surrounding the volume-regulating chamber 1 from the outside. The air ultrasonic generator structure 5 is precisely driven by a controller 7 to excite ultrasonic energy of a specific frequency in the air. These ultrasonic waves penetrate the wall of the volume-regulating chamber 1 and radiate directly into the internal liquid.

[0040] The air ultrasonic generator structure 5 utilizes the strong cavitation effect and microjets generated by ultrasound in the liquid to efficiently and non-contactly break up and remove microbubbles and foam adsorbed inside the liquid and on the chamber walls, improving the accuracy and stability of liquid level detection and ensuring the precision of automatic control. When ultrasonic energy penetrates the chamber walls and enters the liquid, it triggers a strong cavitation effect inside the liquid, efficiently achieving uniform mixing throughout the liquid. This non-contact, mechanically agitated mixing method greatly avoids the problems of dead zones or secondary contamination introduced by mechanical agitators. At the same time, combined with the volume fixation process, it ensures that the liquid composition is uniform, the concentration is consistent, and the temperature is stable within the final fixed volume, significantly improving the accuracy and reliability of quantitative analysis.

[0041] In some embodiments, the volume control device further includes a bracket 6, one end of which is connected to the rangefinder 42 and the other end to the air ultrasonic generator structure 5. The bracket 6 supports the rangefinder 42. One end of the bracket 6 is securely connected to the rangefinder 42 body through a precision mechanical interface, while the other end is fixed to the main frame of the U-shaped air ultrasonic generator structure 5 through matching connectors (such as flanges or clamps), thereby establishing a direct and stable rigid connection between the rangefinder 42 and the air ultrasonic structure. The bracket 6 is designed according to the required working height and angle of the rangefinder 42, ensuring that after installation, the rangefinder 42 is located at a preset position directly above the transparent top cover of the volume control chamber 1, and that the optical path of the laser emitter 421 is precisely aligned with the central axis of the chamber, while not interfering with the U-shaped arrangement and operation of the air ultrasonic structure around the chamber. The bracket 6 is made of high-rigidity material and has a fine-tuning mechanism for calibration and positioning.

[0042] The bracket 6 unifies the two functional components on a rigid support reference. The bracket 6 forcibly maintains the preset spatial relative position between the rangefinder 42 and the ultrasonic generator, avoiding misalignment caused by handling, thermal deformation or accidental contact. At the same time, its compact integrated design minimizes the installation space and number of structural components required for the independent cantilever support of the rangefinder 42, improving the overall rigidity and vibration resistance of the equipment.

[0043] In some embodiments, the air ultrasonic generator 5 is electrically connected to the controller 7, which is used to start and stop the air ultrasonic generator 5 based on liquid level data. The power supply and signal cables of the air ultrasonic generator 5 are directly connected to the controller 7, forming a complete electrical closed loop. The start and stop of the air ultrasonic generator 5 no longer rely on manual operation, but are dynamically and dynamically decided by the controller 7 based on the liquid level. For example, when the liquid level reaches a preset value, the ultrasonic generator is automatically triggered, or when the liquid level is lower than a preset value, the ultrasonic generator is turned off, achieving precise scheduling of the ultrasonic working state. The working time of the air ultrasonic generator 5 can be set as needed. When the liquid level reaches the preset value, the air ultrasonic generator 5 is automatically started, and when the air ultrasonic generator 5 has worked for the preset time, it is automatically turned off.

[0044] The air ultrasonic generator structure 5 is activated only at critical stages, utilizing the cavitation effect to thoroughly remove air bubbles and impurities from the high-level liquid surface, avoiding optical interference from air bubbles in determining the final liquid level. Precise start-stop control significantly reduces the ineffective operating time of the air ultrasonic generator structure 5, such as avoiding continuous operation during the initial stage of liquid injection or after evacuation, which reduces equipment heat generation and energy consumption, extends service life, and also reduces high-frequency vibration interference of ultrasonic waves on sensors; thus, ultrasonic on-demand start-stop enhances mixing efficiency.

[0045] In some embodiments, the bottom of the constant-volume chamber 1 is also provided with a drain port and a drain valve, the drain valve being used to open and close the drain port. A drain port is opened in the bottommost region of the constant-volume chamber 1, and a controllable drain valve is installed in series on the fluid channel of the drain port. The drain valve can be a solenoid valve, a pneumatic diaphragm valve, or a manual precision needle valve, and the specific type can be selected as needed. As the only physical outlet for the liquid to flow out of the chamber, the drain port is designed to ensure that the liquid in the chamber is emptied to the maximum extent to avoid residue; the drain valve is located adjacent to the drain port or is an integral part thereof, and physically opens and closes the drain channel through the opening and closing action of the valve core.

[0046] The fundamental function of the drain port and drain valve is to provide efficient active liquid discharge capability after volume determination. When a volume determination process is completed or the chamber needs cleaning and maintenance, the drain valve is opened, and the liquid can be completely discharged through the bottom drain port under gravity, without the need for pouring or external suction, greatly simplifying the operation process, avoiding liquid splashing and contamination, and saving operation time. The same chamber can sequentially execute the process of "precise liquid injection, volume determination measurement, rapid liquid discharge, cleaning preparation, and next liquid injection". With the programmed management of controller 7, unattended continuous batch processing can be achieved, greatly improving equipment efficiency and capacity. In addition, the structure of the drain port located at the absolute lowest point and directly connected in series with the valve can minimize liquid residue, ensure the purity of the initial state when the next volume determination is performed, and also ensure the absolute accuracy of continuous volume determination calibration.

[0047] In some embodiments, the drain valve is connected to a controller 7, which is used to start and stop the drain valve. The drain valve is directly electrically connected to the output of the controller 7 and receives switching command signals from the controller 7. At the same time, the controller 7 continuously receives and processes real-time liquid level data streams from the volume control component 4 and user-preset drain trigger conditions. The drain valve is installed on the fluid channel of the drain port at the bottom of the volume control chamber 1 and is used to open or close the flow section of the drain port according to the instructions of the controller 7, forming precise electrical control of the draining action.

[0048] Controller 7 autonomously triggers the draining operation based on the liquid level detection results. When the system determines that the volume-fixing process is complete, i.e., the actual liquid level reaches the preset value, it immediately outputs a signal to open the drain valve, achieving a seamless connection between measurement and immediate emptying, eliminating manual operation delays and significantly improving batch processing efficiency. Alternatively, when the system determines that the volume-fixing process is complete and the predetermined ultrasonic treatment is completed simultaneously, it immediately outputs a signal to open the drain valve, emptying the liquid and realizing the fully automated implementation of the "measurement, volume-fixing, ultrasonic treatment, and active draining" process. Controller 7 can proactively avoid the risk of accidental opening during non-draining stages, eliminating equipment damage or reagent waste caused by accidental liquid leakage. Combined with automatic draining, it can realize unattended multi-batch continuous volume-fixing operations. After emptying, it automatically closes the valve and starts chamber cleaning or prepares for new liquid injection circulation, meeting the automation needs of industrial production.

[0049] In some implementations, such as Figure 2 As shown, the controller 7 includes a signal receiving module 71, a memory 72, and a judgment module 73 connected in sequence: the signal receiving module 71 is electrically connected to the volume control component 4 and is used to receive the liquid level data measured by the volume control component 4; the memory 72 is used to pre-store preset liquid level values ​​and gradient thresholds; the judgment module 73 is electrically connected to the power pump 3 and is used to start and stop the power pump 3. The signal receiving module 71 is directly electrically connected to the liquid level sensor 41 and the rangefinder 42 to collect liquid level measurement data in real time; the processed data is input to the memory 72, which stores user-preset key parameters, including preset liquid level values ​​and gradient thresholds; the data output by the memory 72 is read in real time by the judgment module 73, which establishes an electrical connection with the power pump 3 driver through a control line and generates precise start and stop control signals for the power pump 3 based on preset existing logic. The pre-defined logic can be as follows: when the real-time liquid level is significantly lower than the preset liquid level value, the power pump 3 delivers liquid to the constant volume chamber 1 at a normal speed; when the real-time liquid level reaches the gradient threshold, the power pump 3 is adjusted to reduce the speed at which liquid enters the constant volume chamber 1, preventing difficulty in controlling the liquid flow rate under high-speed flow conditions; when the real-time liquid level reaches the preset liquid level value, the power pump 3 is shut off, and liquid injection stops. The controller 7 can use existing microcontrollers and PLC programs to achieve automated control.

[0050] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0051] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0052] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0053] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A volume-regulating device, characterized in that, The volume-regulating device includes: Fixed-volume chamber (1); The reagent chamber (2) is connected to the volumetric chamber (1) via a power pump (3) and supplies liquid to the volumetric chamber (1); The volume control assembly (4) includes a liquid level sensor (41) and a rangefinder (42). The measuring electrode (41a) of the liquid level sensor (41) is placed inside the volume control chamber (1). The rangefinder (42) is positioned above the volume control chamber (1) and is used to emit a laser beam into the volume control chamber (1). The liquid level sensor (41) and the rangefinder (42) are used to measure the liquid level data of the liquid inside the volume control chamber (1). The controller (7) is connected to the power pump (3) and the volume control component (4). The controller (7) is used to receive the liquid level data measured by the volume control component (4) and start and stop the power pump (3).

2. The volume-regulating device according to claim 1, characterized in that, The rangefinder (42) includes two laser emitters (421), which are used to emit laser beams into the interior of the volume-fixing chamber (1). One of the laser emitters (421) is aligned with the center of the liquid surface inside the volume-fixing chamber (1), and the other laser emitter (421) is aligned with the junction of the inner wall of the volume-fixing chamber (1) and the liquid surface.

3. The volume-regulating device according to claim 2, characterized in that, The rangefinder (42) is located outside the fixed-volume chamber (1), and the top cover of the fixed-volume chamber (1) is a transparent top cover, which is used to allow the laser beam to pass through.

4. The volume-regulating device according to claim 1, characterized in that, The volume-fixing chamber (1) is a transparent chamber, and the outer wall of the volume-fixing chamber (1) has scale lines.

5. The volume-regulating device according to any one of claims 1-4, characterized in that, The constant volume chamber (1) has a sealed cavity for holding liquid, and the measuring electrode (41a) is housed in the sealed cavity and passes through the constant volume chamber (1) to be connected to the processor (41b) of the liquid level sensor (41).

6. The volume-regulating device according to any one of claims 1-4, characterized in that, The volume-regulating device further includes: An air ultrasonic generator structure (5) is U-shaped and surrounds the outer periphery of the fixed-volume chamber (1). The air ultrasonic generator structure (5) is used to send ultrasonic waves to the fixed-volume chamber (1).

7. The volume-regulating device according to claim 6, characterized in that, The volume-regulating device further includes: The bracket (6) is connected at one end to the rangefinder (42) and at the other end to the air ultrasonic generator (5). The bracket (6) is used to support the rangefinder (42).

8. The volume-regulating device according to claim 6, characterized in that, The air ultrasonic generator (5) is electrically connected to the controller (7), and the controller (7) is used to start and stop the air ultrasonic generator (5) according to the liquid level data.

9. The volume-regulating device according to any one of claims 1-4, characterized in that, The bottom of the constant volume chamber (1) is also provided with a drain port and a drain valve, the drain valve being used to open and close the drain port.

10. The volume-regulating device according to claim 9, characterized in that, The drain valve is connected to the controller (7), which is used to start and stop the drain valve.

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