External detection type liquid level detector

Abstract

The utility model discloses an external measurement type liquid level detector which comprises a tray, a through opening vertically penetrating through the tray is formed in the center of the tray, lifting seats are arranged on the periphery of the bottom of the tray, a carrier plate is arranged between the lifting seats, a base aligned to the through opening is arranged on the carrier plate, a center air bag is arranged on the base, and a liquid level sensor is arranged on the center air bag. An ultrasonic probe penetrating through the through opening is arranged at the top end of the central air bag. The ultrasonic probe and the barrel filled with the cleaning fluid are designed in a separated mode, the barrel filled with the cleaning fluid is directly placed on the tray, the gravity of the barrel filled with the cleaning fluid is used for exerting pressure on the ultrasonic probe, then extra pressure is exerted on the central air bag, the ultrasonic probe moves downwards, and once the cleaning fluid in the barrel is used up, a new barrel needs to be replaced. When the ultrasonic probe is replaced, the barrel can be directly lifted away to be replaced, compared with an existing external detection type liquid level detector or a contact type liquid level detector, the ultrasonic probe does not need to be repeatedly disassembled and assembled, and therefore replacement work is effectively more convenient.

Description

Technical Field

[0001] This utility model belongs to the field of liquid level detection technology, and in particular relates to an external liquid level detector. Background Technology

[0002] In industrial production and daily life, the demand for monitoring the liquid level in containers is increasing. Among the many existing liquid level detection methods, weighing devices are a commonly used method for monitoring the liquid level inside containers. However, during use, the weighing elements of weighing devices are subjected to the heavy pressure of the container and liquid for a long time, which can easily lead to fatigue and deformation, thereby reducing the service life of the weighing elements and affecting the accuracy and stability of liquid level monitoring.

[0003] Traditional liquid level detection methods are diverse. Although contact ultrasonic level gauges can directly measure the liquid volume, they are susceptible to liquid corrosion and have complex installation. External ultrasonic level gauges avoid some of the problems of contact types, but when containers such as barrels containing cleaning fluid need to be changed frequently, the repeated disassembly and assembly of the ultrasonic level gauge itself is inconvenient. Summary of the Invention

[0004] The purpose of this invention is to address the problems existing in the prior art by providing an external liquid level detector, which solves the problem of inconvenient operation when changing tanks containing cleaning fluid using traditional external liquid level detectors or contact liquid level detectors.

[0005] To achieve the above objectives, the utility model adopts the following technical solution: an external liquid level detector, including a tray, a vertical through-hole in the center of the tray, raised seats around the bottom of the tray, a carrier plate between the raised seats, a base aligned with the through-hole on the carrier plate, a central airbag on the base, an ultrasonic probe passing through the through-hole at the top of the central airbag, and a main unit connected to the ultrasonic probe on the carrier plate.

[0006] In the above technical solution, the ultrasonic probe and the cleaning fluid container are designed to be separate. The container is placed directly on a tray, and the weight of the container puts pressure on the ultrasonic probe, which in turn puts additional pressure on the central air bladder, forcing the central air bladder to deform and causing the ultrasonic probe to move downward. Under the reaction force of the return spring and the central air bladder, the ultrasonic probe can also be kept close to the bottom of the container, ensuring the accuracy of the ultrasonic probe in measuring the water level. Once the cleaning fluid in the container is exhausted or the water level is lower than the preset level, a new container can be directly removed for replacement. Compared with existing external or contact liquid level detectors, there is no need to repeatedly disassemble and reassemble the ultrasonic probe itself, thus making the replacement work more convenient. At the same time, compared with the method of using a weighing scale to reflect the liquid level from the side, this method is not only more direct, but also, because the ultrasonic probe in this application can move up and down through the action of the central air bladder, the ultrasonic probe is only subjected to the force of the central air bladder and the return spring. This force is less than the weight of a full or empty container, avoiding long-term heavy pressure and extending its service life.

[0007] Optionally, the diameter of the port is 0.5-1cm larger than the diameter of the ultrasonic probe, which allows the ultrasonic probe to move freely up and down while also providing a good guiding effect for the ultrasonic probe.

[0008] Optionally, when the central airbag is not under additional pressure, the ultrasonic probe passes through the opening and its top surface is higher than the upper surface of the tray; when the central airbag is under additional pressure, the top surface of the ultrasonic liquid level is flush with the upper surface of the tray.

[0009] In the above technical solution, the ultrasonic probe protrudes from the tray when it is empty. Once a bucket containing cleaning fluid is placed on the tray, it will exert pressure on the ultrasonic probe, causing it to move down and ensuring that the bucket containing cleaning fluid can be placed stably. Furthermore, the state of the central airbag is automatically adjusted by gravity, requiring no additional power source, which is energy-saving and highly reliable.

[0010] Optionally, the base includes a base plate, and pads are provided on both sides of the bottom of the base plate.

[0011] Optionally, the central airbag is a cylindrical airbag, and a pressure equalization plate is provided on the top of the central airbag. The diameter of the pressure equalization plate is larger than the diameter of the central airbag, and the central axis of the pressure equalization plate coincides with the central axis of the central airbag. The ultrasonic liquid level is set at the center of the top of the pressure equalization plate.

[0012] The above technical solution expands the stress-bearing area through the pressure-equalizing plate, dispersing the pressure of the ultrasonic probe and preventing excessive local deformation of the airbag. Simultaneously, the columnar structure ensures vertical expansion of the airbag, maintaining the measurement axis of the ultrasonic probe perpendicular to the container and reducing angular deviation.

[0013] Optionally, a return spring is vertically installed inside the central airbag, with its two ends connected to the inner top wall and inner bottom wall of the central airbag, respectively. The return spring provides the central airbag with a more stable and longer-lasting return capability.

[0014] Optionally, the sidewall of the carrier plate is in contact with the inner sidewall of the lifting seat.

[0015] Optionally, the carrier plate is equipped with an alarm connected to the main unit via a wire. The main unit links the ultrasonic probe with the alarm, enabling the device to remind staff to replace empty containers or containers with liquid levels below a preset value in a timely manner.

[0016] Compared with existing technologies, the advantages of this utility model are: 1. The ultrasonic probe and the cleaning fluid container are designed to be separate. The cleaning fluid container is placed directly on a tray. The weight of the cleaning fluid container puts pressure on the ultrasonic probe, which in turn puts additional pressure on the central air bladder, forcing the central air bladder to deform and causing the ultrasonic probe to move downward. Under the reaction force of the return spring and the central air bladder, the ultrasonic probe can also be kept close to the bottom of the cleaning fluid container to ensure the accuracy of the ultrasonic probe in measuring the water level. Once the cleaning fluid in the container is exhausted or the liquid level is lower than the preset value and a new container needs to be replaced, the container can be directly lifted away for replacement. Compared with existing external liquid level detectors or contact liquid level detectors, it is not necessary to repeatedly disassemble and reassemble the ultrasonic probe itself, thus effectively simplifying the replacement process. The operation is more convenient. Compared with the method of using electronic scales to weigh the side to reflect the liquid level, it is not only more direct, but also more convenient. The ultrasonic probe in this application can move up and down by the action of the central air bladder, so that the ultrasonic probe only receives the force of the central air bladder and the return spring. This force is less than the weight of the full and empty container, avoiding long-term heavy pressure and extending its service life. 2. The air bladder state is automatically adjusted by gravity, without the need for an additional power source, which is energy-saving and highly reliable. 3. The pressure equalization plate expands the force-bearing area, disperses the pressure of the ultrasonic probe, and avoids excessive local deformation of the air bladder. At the same time, the columnar structure ensures that the air bladder expands vertically, keeping the measuring axis of the ultrasonic probe perpendicular to the container and reducing angular deviation. 4. The return spring provides a more stable and longer-lasting return capability for the central air bladder. Attached Figure Description

[0017] Figure 1 A three-dimensional side-view diagram of the external liquid level detector provided by this utility model;

[0018] Figure 2 A three-dimensional schematic diagram of the width direction section of the external liquid level detector provided by this utility model;

[0019] Figure 3 A three-dimensional side-view diagram of the external liquid level detector provided by this utility model;

[0020] Figure 4 This is a schematic diagram of the assembly of the external liquid level detector and the cleaning liquid tank provided by this utility model.

[0021] In the diagram: 1. Tray; 2. Opening; 3. Elevating seat; 4. Carrier plate; 5. Base; 6. Central airbag; 7. Equalizing plate; 8. Ultrasonic probe; 9. Return spring; 10. Main unit; 11. Alarm. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "middle", "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] like Figure 1 As shown in Figure 4, the specific scheme of the embodiment is as follows: An external liquid level detector includes a tray 1, a vertical through-hole 2 is provided in the center of the tray 1, a raised seat 3 is provided around the bottom of the tray 1, a carrier plate 4 is provided between the raised seats 3, a base 5 is provided on the carrier plate 4 aligned with the through-hole 2, a central airbag 6 is provided on the base 5, an ultrasonic probe 8 is provided at the top of the central airbag 6 through the through-hole 2, and a host 10 connected to the ultrasonic probe 8 is provided on the carrier plate 4.

[0025] The ultrasonic probe 8 is designed to be separate from the cleaning fluid container. The container is placed directly on the tray 1. The weight of the container puts pressure on the ultrasonic probe 8, which in turn puts additional pressure on the central air bladder 6, forcing it to deform and causing the ultrasonic probe 8 to move downwards. The reaction force of the return spring 9 and the central air bladder 6 ensures that the ultrasonic probe 8 remains firmly against the bottom of the container, guaranteeing the accuracy of the water level measurement. When the cleaning fluid in the container is exhausted and needs to be replaced, the container can be easily lifted out of the container. Compared to existing external or contact level detectors, this method eliminates the need for repeated disassembly and reassembly of the ultrasonic probe, making replacement much more convenient. Furthermore, compared to methods using weighing scales to reflect the liquid level, this method is not only more direct, but also allows the ultrasonic probe 8 to move up and down via the central airbag 6. This ensures the probe 8 is only subjected to the force of the central airbag 6 and the return spring 9, which is less than the weight of a full or empty container, thus avoiding prolonged heavy pressure and extending its service life.

[0026] In this embodiment, the diameter of the port 2 is 0.5-1cm larger than the diameter of the ultrasonic probe 8, which allows the ultrasonic probe 8 to move freely up and down, and also provides a good guiding effect for the ultrasonic probe 8.

[0027] In this embodiment, when the central airbag 6 is not subjected to additional pressure, the ultrasonic probe 8 passes through the opening 2 and its top surface is higher than the upper surface of the tray 1; when the central airbag 6 is subjected to additional pressure, the top surface of the ultrasonic liquid level is flush with the upper surface of the tray 1.

[0028] In the above technical solution, when the tray 1 is empty, the ultrasonic probe 8 protrudes from the tray 1. Once a bucket containing cleaning fluid is placed on the tray 1, it will exert pressure on the ultrasonic probe 8, causing the ultrasonic probe 8 to move down, ensuring that the bucket containing cleaning fluid can be placed stably. Furthermore, the state of the central airbag 6 is automatically adjusted by gravity, requiring no additional power source, which is energy-saving and highly reliable.

[0029] like Figure 2 As shown in this embodiment, the base 5 includes a base plate, and pads are provided on both sides of the bottom of the base plate.

[0030] In this embodiment, the central airbag 6 is a cylindrical airbag, and a pressure equalization plate 7 is provided on the top of the central airbag 6. The diameter of the pressure equalization plate 7 is larger than the diameter of the central airbag 6, and the central axis of the pressure equalization plate 7 coincides with the central axis of the central airbag 6. The ultrasonic liquid level is set at the center of the top of the pressure equalization plate 7.

[0031] The above technical solution expands the stress-bearing area through the equalizing plate 7, dispersing the pressure of the ultrasonic probe 8 and preventing excessive local deformation of the airbag. Simultaneously, the columnar structure ensures vertical expansion of the airbag, maintaining the measurement axis of the ultrasonic probe perpendicular to the container and reducing angular deviation.

[0032] In this embodiment, a return spring 9 is vertically installed inside the central airbag 6. The two ends of the return spring 9 are connected to the inner top wall and the inner bottom wall of the central airbag 6, respectively. The return spring 9 provides the central airbag 6 with a more stable and longer-lasting return capability.

[0033] In this embodiment, the sidewall of the carrier plate 4 and the sidewall of the lifting seat 3 are in contact with each other and are detachable, so that the carrier plate 4 can be easily removed to inspect or replace the ultrasonic probe 8 or the central airbag 6.

[0034] In this embodiment, a host 10 connected to an ultrasonic probe 8 via a wire is mounted on the carrier plate 4. An alarm 11 connected to the host 10 is also mounted on the carrier plate 4. The host 10 links the ultrasonic probe 8 and the alarm 11. When the liquid level in the container containing cleaning fluid is lower than the minimum level, the ultrasonic probe 8 emits and receives ultrasonic waves into the container. The host 10 then controls the alarm 11 to sound an alarm, thus reminding staff to replace the empty container in time.

[0035] In this embodiment, the host 10 is equipped with a setting button and a display screen, which can be used to set an alarm threshold. When the liquid level in the tank is detected to be lower than the threshold, the alarm 11 will sound an alarm.

[0036] It should be noted that in this embodiment, the ultrasonic probe 8 and the main unit 10 together constitute a complete external ultrasonic level gauge. This external ultrasonic level gauge uses a mature product already available on the market, such as the TK-LS intelligent external ultrasonic level switch. It employs a unique measuring sensitive element (ultrasonic probe 8) installed on the outer wall of the container being measured. The sensor is externally attached, and the measurement is non-contact with the measured liquid medium, achieving truly complete isolation measurement. No holes are made in the tank, no open flame is required, and installation is possible without interrupting production.

[0037] The TK-LS intelligent external ultrasonic level switch has a probe attached to the outer wall of the container, and the high-frequency pulse signal it emits can penetrate the container wall. This pulse signal can propagate through the container wall and the medium, and is also reflected back by the inner surface of the container. By detecting and calculating this reflection and propagation characteristics within the container wall, it is possible to accurately determine whether the liquid level has reached the limit position.

[0038] Preferably, the return spring 9 is a large-diameter spring with an inner diameter of not less than 5 cm. Using this large-diameter spring makes the rise and fall more smoothly when the return spring 9 is compressed and reset.

[0039] Preferably, the return spring 9 is a small-diameter spring, and multiple springs are arranged in a ring. By replacing a single spring with multiple return springs 9, the pressure is distributed, the lifting and lowering are stable, and the service life is long.

[0040] like Figure 1 , Figure 4 As shown, the working principle of the above embodiment is as follows: the cleaning fluid tank is placed on the tray 1, and the weight of the tank acts on the ultrasonic probe 8, causing the central airbag 6 to be compressed and flattened, which compresses the return spring 9 and moves the ultrasonic probe 8 downward. Under the reaction of the central airbag 6 and the return spring 9, the ultrasonic probe 8 is pressed against the bottom of the tank to accurately measure the liquid level. When the cleaning fluid in the tank is exhausted or falls below the preset value and needs to be replaced, the old tank is simply lifted away, and the central airbag 6 and the return spring 9 automatically return to their original positions, thereby allowing the ultrasonic probe 8 to return to its initial position. Replacement can be performed without disassembling the ultrasonic probe, which effectively improves the replacement efficiency.

[0041] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An external liquid level detector, characterized in that, The device includes a tray with a vertical through-hole in the center, raised seats around the bottom of the tray, a carrier plate between the raised seats, a base aligned with the through-hole on the carrier plate, a central airbag on the base, an ultrasonic probe passing through the through-hole at the top of the central airbag, and a main unit connected to the ultrasonic probe on the carrier plate.

2. The external liquid level detector according to claim 1, characterized in that: The diameter of the opening is 0.5-1 cm larger than the diameter of the ultrasonic probe.

3. The external liquid level detector according to claim 1, characterized in that: When the central airbag is not under additional pressure, the ultrasonic probe passes through the opening and its top surface is higher than the upper surface of the tray; when the central airbag is under additional pressure, the top surface of the ultrasonic probe is flush with the upper surface of the tray.

4. The external liquid level detector according to claim 1, characterized in that: The base includes a base plate, and pads are provided on both sides of the bottom of the base plate.

5. An external liquid level detector according to claim 1, characterized in that: The central airbag is a cylindrical airbag, and a pressure equalization plate is provided on the top of the central airbag. The diameter of the pressure equalization plate is larger than the diameter of the central airbag, and the central axis of the pressure equalization plate coincides with the central axis of the central airbag. The ultrasonic probe is located at the center of the top of the pressure equalization plate.

6. An external liquid level detector according to claim 1, characterized in that: A return spring is vertically installed inside the central airbag, and the two ends of the return spring are connected to the inner top wall and the inner bottom wall of the central airbag, respectively.

7. An external liquid level detector according to claim 1, characterized in that: The sidewall of the carrier plate is in contact with the inner sidewall of the lifting seat.

8. An external liquid level detector according to claim 1, characterized in that: The carrier board is equipped with an alarm that is connected to the host via a wire.

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