Liquid level sensor
By adding a buffer container to the periphery of the level sensor probe, the problems of liquid fluctuations and eddy current interference are solved, and the more accurate and stable detection effect of the level sensor is achieved, extending the equipment maintenance cycle.
Patent Information
- Application Number
- CN202323670699.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-29
- Publication Date
- 2025-02-14
- Estimated Expiration
- 2033-12-29
AI Technical Summary
During the detection process, existing liquid level sensors are easily affected by interference factors such as liquid fluctuations and eddy currents, resulting in abnormal detection effects and false alarms, frequent start and stop or stop work.
A buffer container is added to the periphery of the probe. After the liquid enters the cavity of the buffer container, the buffer container resists the fluctuations and vortexes of the liquid to ensure that the probe can accurately detect the water level.
Through the design of the buffer container, false alarms and frequent start-stop conditions are reduced, the equipment maintenance cycle is extended, and the accuracy and stability of liquid level detection are improved.
Smart Images
Figure CN222481577U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a sensor, in particular to a liquid level sensor. Background Art
[0002] Liquid level sensors are sensor devices used to measure liquid levels. They are widely used in various industries and play an indispensable role in them. The application of liquid level sensors has promoted the optimization and improvement of industrial processes, improved production efficiency and environmental protection. Therefore, with the improvement of the intelligence level of various industries, liquid level sensors need to adapt to various working environments.
[0003] Liquid level sensors are important components for the normal operation of many systems. Currently, the probes of probe sensors are mostly exposed, and are often affected by interference factors such as liquid fluctuations and eddy currents during the detection process, resulting in abnormal detection results, which in turn leads to false alarms, frequent starts and stops, or even shutdowns of the equipment using the liquid level sensor, and even shortens the maintenance cycle of the equipment. Therefore, in the case of drastic liquid level fluctuations, the probe needs to be installed at the position where the equipment liquid level disturbance is minimized and as far away from these interference sources as possible. However, this ideal state is difficult to achieve in real equipment. Summary of the invention
[0004] The purpose of the utility model is to solve the above problems existing in the prior art and provide a liquid level sensor. A buffer container is added to the periphery of the probe. When detecting, after the liquid device enters the inner cavity of the buffer container, the buffer container resists interference factors such as fluctuations and eddies of the liquid.
[0005] This helps the probe to accurately detect the water level, reduce or even avoid false alarms, frequent starts and stops, or even shutdowns, and also helps to extend the maintenance cycle of the equipment.
[0006] The above technical purpose of the utility model is mainly solved by the following technical solutions: a liquid level sensor, including a probe sensor, the probe sensor including a seat, a probe with one end arranged on the seat and the other end extending outward, characterized in that a buffer container is arranged on the seat, a liquid inlet is arranged at one end of the buffer container away from the seat, and the probe is placed in the inner cavity of the buffer container. In this technical solution, by adding a buffer container on the periphery of the probe, interference factors such as fluctuations and eddies of the liquid present in the detection are counteracted.
[0007] This helps the probe to accurately detect the water level, reduce or even avoid false alarms, frequent starts and stops, or even shutdowns, and also helps to extend the maintenance cycle of the equipment. Extending the maintenance cycle can correspondingly reduce the investment in manpower and material resources, which is beneficial to energy conservation and emission reduction.
[0008] In particular, the exhaust valve (composed of an exhaust channel and a plug assembly) on the buffer container is used to exhaust the air in the buffer container and fill it with liquid. The two probes are in a conducting state, and the exhaust valve is closed in the use / testing state. When the flow rate in the tested pipeline is too fast to generate negative pressure, the liquid level in the buffer container drops below the probes, and the two probes are disconnected and the signal is fed back. At this time, the liquid level will fluctuate, but because the exhaust valve is closed, the liquid level will only drop below the end of the probe when the fluctuation exceeds the allowable range.
[0009] As a further improvement and supplement to the above technical solution, the utility model adopts the following technical measures: the probe is arranged along the axial direction of the buffer container, and the length of the probe is less than the depth of the buffer container, so that the area between the liquid surface in the buffer container and the end of the probe before detection can cope with a certain amount of negative pressure variation range in the detection pipeline. For example, there is a detected device (such as a pump group device), whose inlet pipeline is connected to the water tank, and the liquid level sensor is installed on this pipeline. When the liquid fluctuation in the pipeline intensifies, a vacuum will be formed at the upper end of the buffer container. When the water level is not lower than the lowest end of the probe, the vacuum is less and the equipment operates normally. The role of the length of the probe is to form a fault tolerance range. When the water level in the container is lower than the lowest end of the probe, that is, when the two probes are not in contact with water, the circuit is disconnected and the water pump stops running.
[0010] The buffer body of the buffer container is in the shape of a truncated cone, the first end of the buffer body is a large diameter end, the first end is connected to the seat body, the second end of the buffer body is a small diameter end, and the second end is used to form a connection with the detected device. The liquid level in the buffer container with the same negative pressure difference in the detected pipeline tends to be the same, so that the detection curve tends to be linear, thereby facilitating the control of the allowable range of fluctuations.
[0011] The second end of the buffer body is provided with an outwardly protruding connecting column, the connecting column has an external thread, the diameter of the connecting column is smaller than the diameter of the second end of the buffer body, and the connecting column is used to form a threaded connection with the detected device. The setting of the connecting column facilitates the connection of the liquid level sensor to the device to be detected. The inner cavity of the buffer body is relatively large, and the diameter of the second end of the buffer body is also larger than the diameter of the connecting column, so that the inner cavity volume of the buffer body is relatively large.
[0012] In order to exhaust the inner cavity of the buffer container before testing, an exhaust channel is provided on the buffer container, the exhaust channel connects the inner cavity of the buffer container and the outer space of the buffer container, and a plug assembly is provided in the exhaust channel for opening or closing the exhaust channel. Exhausting excess air through the exhaust channel is conducive to the smooth entry of liquid in the equipment into the inner cavity of the buffer container, and accurate measurement of the water level by the probe.
[0013] Preferably, the plug assembly includes an intermediate connector and a plug, the outer end of the exhaust channel is provided with an internal thread, the inner end of the intermediate connector is an external thread end, the external thread end is inserted into the exhaust channel and forms a threaded connection with the buffer container, the outer end of the intermediate connector is provided with a first connecting hole, the inner wall of the first connecting hole has an internal thread, the connecting end of the plug has an external thread, the connecting end of the plug is inserted into the first connecting hole and forms a threaded connection with the intermediate connector. The provision of the intermediate connector is conducive to the plug smoothly blocking the exhaust channel or opening the exhaust channel to connect the inside and outside of the buffer body cavity, and the plug is opened when the detected equipment is filled with water, and the exhaust channel is exhausted. When the exhaust channel is blocked, liquid is prevented from flowing out through the exhaust channel.
[0014] In order to smoothly tighten the plug, the intermediate connecting piece is provided with an exhaust through hole, the exhaust through hole axially penetrates the intermediate connecting piece, and the first connecting hole is connected with the inner cavity of the buffer container through the exhaust through hole.
[0015] The first end of the buffer body is provided with an outwardly protruding connection seat, and a second connection hole with an internal thread is provided on the connection seat, and the connection part on the seat body is inserted into the second connection hole to form a threaded connection. The provision of the outwardly protruding connection seat is conducive to increasing the thickness of the connection part, and is conducive to enhancing the stable and reliable connection between the buffer container and the seat body of the sensor, and the width of the connection seat is adapted to the external dimensions of the connection part on the seat body, which is conducive to saving raw materials consumed by the connection seat, reducing costs, and saving energy and reducing emissions.
[0016] Further preferably, in order to further reduce the consumption of raw materials and avoid sharp corners to prevent operators from being scratched by sharp corners, the connecting seat is in an elongated shape, and the end surface of the connecting seat away from the buffer body is an arc-shaped surface facing the buffer body.
[0017] In order to increase the connection thickness of the plug assembly and improve assembly reliability, the exhaust channel on the buffer container is arranged on the connecting seat and passes through the connecting seat. The exhaust channel is arranged at an angle, and the inner end of the exhaust channel faces the center of the buffer body.
[0018] The utility model has the following beneficial effects: 1. By adding a buffer container, the liquid level sensor has a liquid level fluctuation buffering function, so that the liquid area entering the inner cavity of the buffer container is calm, which is conducive to ensuring the stability of the liquid level, improving the accuracy of liquid level detection, avoiding the situation where the liquid level suddenly drops to the end of the probe, and ensuring the stability of the liquid level inside the container, thereby avoiding the occurrence of false alarms, frequent start and stop, and even shutdown of the equipment, which is conducive to the stable operation of the equipment. 2. It is conducive to improving the scope of application and performing reversible detection (the alarm state can be normally open or normally closed, and the alarm state is switched after the probe performs signal feedback): through the normally open or normally closed state of the liquid level relay connected to the liquid level sensor, it can be applied to different needs (it can detect the conventional water state and alarm when there is no water; it can also detect the waterless state and alarm when there is water), and can be applied to water treatment, water supply system, industrial process control, etc. 3. It is conducive to reducing maintenance: because the sensitivity to interference is reduced, the anti-interference ability is increased (the specific principle is: the original sensor may be sensitive to small fluctuations and cause the equipment to shut down, and the fluctuation is within the allowable range, causing false shutdown). 4. By combining the buffer container with the probe length, a fault tolerance range is formed, which can reduce the number of equipment maintenance times to a certain extent, and can effectively avoid the situation where the probe is placed in a liquid level fluctuation environment for a long time, resulting in abnormal detection feedback, frequent equipment response, and abnormal system data processing, which leads to a short maintenance cycle. 5. The overall structure is reasonable, easy and quick to install, and can also provide signal feedback for the detected liquid level. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 It is a cross-sectional structural diagram of the utility model passing through an axis.
[0020] Figure 2 It is another cross-sectional structural diagram of the utility model.
[0021] Figure 3 It is a three-dimensional structural schematic diagram of the utility model.
[0022] Figure 4 It is a schematic diagram of a liquid level relay control circuit involved in the utility model.
[0023] In the figure: 1. seat body; 2. probe; 3. buffer container; 4. liquid inlet; 5. buffer body; 6. first end; 7. second end; 8. connecting column; 9. exhaust channel; 10. intermediate connecting piece; 11. plug; 12. first connecting hole; 13. exhaust through hole; 14. connecting seat; 15. second connecting hole; 16. arc surface; 17. wire. DETAILED DESCRIPTION
[0024] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.
[0025] Example: Figure 1-Figure 4 A liquid level sensor comprises a probe sensor, wherein the probe sensor comprises a base body 1, a probe 2 with one end arranged on the base body 1 and the other end extending outward, characterized in that a buffer container 3 is arranged on the base body 1, a liquid inlet 4 is arranged at one end of the buffer container 3 away from the base body 1, and the probe 2 is placed in the inner cavity of the buffer container 3.
[0026] The improvement of the present technical solution over the prior art mainly lies in the addition of a buffer container 3. Specifically, the probe 2 is arranged in the inner cavity of the buffer container 3, and the liquid (i.e. the liquid to be measured) contacting the probe 2 resists interference factors such as fluctuations and eddies of the liquid through the buffer container 3, thereby facilitating the probe 2 to accurately detect the water level, reducing or even avoiding the occurrence of false alarms, frequent starts and stops, or even shutdowns, and also facilitating the extension of the maintenance cycle of the equipment. Extending the maintenance cycle can correspondingly reduce the investment of manpower and material resources, and is conducive to energy conservation and emission reduction.
[0027] In particular, the exhaust valve (composed of the exhaust channel 9 and the plug assembly) on the buffer container 3 is used to exhaust the gas in the buffer container 3 and fill it with liquid. The two probes 2 are in a conducting state, and the exhaust valve is in a closed state in the use / detection state; when the flow rate in the detected pipeline is too fast to generate negative pressure, the liquid level in the buffer container drops below the probe, and the two probes are disconnected and the signal is fed back. At this time, the liquid level will fluctuate, but because the exhaust valve is closed, the liquid level will only drop below the end of the probe when the fluctuation exceeds the allowable range.
[0028] According to a further optimization scheme, the probe 2 is arranged along the axial direction of the buffer container 3, and the length of the probe 2 is smaller than the depth of the buffer container 3, so that the liquid to be tested first passes through the buffer container 3 for interference, and the liquid contacts the probe 2 after it becomes calm, which is beneficial to improving the detection accuracy of the probe 2.
[0029] In other words, the area at the bottom of the buffer container 3 and the bottom of the probe 2 forms a range that allows the negative pressure of the tested pipeline to change, forming a fault tolerance range. For example, there is a device to be tested (such as a pump set), whose inlet pipeline is connected to a water tank, and a liquid level sensor is installed on this pipeline. When the fluctuation in the pipeline intensifies, a vacuum will be formed at the upper end of the buffer container 3. When the water level is not lower than the lowest end of the probe 2, the vacuum is small and the equipment operates normally. The role of the length of the probe 2 is to form a fault tolerance range. When the water level in the container is lower than the lowest end of the probe 2, that is, when the two probes 2 are not in contact with water, the circuit is disconnected and the water pump stops running.
[0030] Of course, in order to save the consumption of raw materials, the outer end of the probe 2 is arranged in the buffer container 3 and close to the liquid inlet 4. This technical solution also belongs to the protection scope of the utility model.
[0031] Then, the buffer container 3 is further optimized. The buffer body 5 of the buffer container 3 is in the shape of a truncated cone. The first end 6 of the buffer body 5 is a large diameter end, and the first end 6 is connected to the seat body 1. The second end 7 of the buffer body 5 is a small diameter end, and the second end 7 is used to form a connection with the detected device. The liquid level in the buffer container 3 with the same negative pressure difference in the detected pipeline tends to be the same, so that the detection curve tends to be linear, which is convenient for controlling the allowable range of fluctuations.
[0032] The first end 6 of the buffer body 5 is provided with an outwardly protruding connecting column 8, the connecting column 8 has an external thread, the diameter of the connecting column 8 is smaller than the diameter of the second end 7 of the buffer body 5, and the connecting column 8 is used to form a threaded connection with the detected device. The setting of the connecting column 8 facilitates the connection of the liquid level sensor to the device to be detected. The inner cavity of the buffer body 5 is relatively large, and the diameter of the second end 7 of the buffer body 5 is also larger than the diameter of the connecting column 8, so that the inner cavity volume of the buffer body 5 is relatively large.
[0033] In order to smoothly fill the buffer container 3 with water and discharge excess air during water filling, an exhaust channel 9 is provided on the buffer container 3, the exhaust channel 9 connects the inner cavity of the buffer container 3 and the outer space of the buffer container 3, and a plug assembly is provided in the exhaust channel 9 for opening or closing the exhaust channel 9. Exhausting excess air through the exhaust channel 9 is conducive to the smooth entry of liquid in the device into the inner cavity of the buffer container 3, and accurate measurement of the water level by the probe 2.
[0034] Wherein, the plug assembly includes an intermediate connector 10 and a plug 11, the outer end of the exhaust channel 9 is provided with an internal thread, the inner end of the intermediate connector 10 is an external thread end, the external thread end is inserted into the exhaust channel 9 and forms a threaded connection with the buffer container 3, the outer end of the intermediate connector 10 is provided with a first connecting hole 12, the inner wall of the first connecting hole 12 has an internal thread, the connecting end of the plug 11 has an external thread, the connecting end of the plug 11 is inserted into the first connecting hole 12 and forms a threaded connection with the intermediate connector 10. The setting of the intermediate connector 10 is conducive to the plug 11 to smoothly block the exhaust channel 9 or open the exhaust channel 9 to connect the inside and outside of the inner cavity of the buffer body 5, and the plug is opened when the detected equipment is filled with water, and the exhaust channel is exhausted. When the exhaust channel 9 is blocked, liquid is prevented from flowing out through the exhaust channel 9.
[0035] In order to smoothly tighten the plug 11 , the intermediate connector 10 is provided with an exhaust through hole 13 , which axially penetrates the intermediate connector 10 , and the first connecting hole 12 is connected to the inner cavity of the buffer container 3 through the exhaust through hole 13 .
[0036] In order to form a stable and reliable connection between the buffer body 5 and the connection seat 14, the second end 7 of the buffer body 5 is provided with a convex connection seat 14, and a second connection hole 15 with an internal thread is provided on the connection seat 14. The connection part on the seat body 1 is inserted into the second connection hole 15 and forms a threaded connection. The provision of the convex connection seat 14 is conducive to increasing the thickness of the connection part, and is conducive to enhancing the stable and reliable connection between the buffer container 3 and the seat body 1 of the sensor, and the width of the connection seat 14 is adapted to the external dimensions of the connection part on the seat body 1, which is conducive to saving the raw materials consumed by the connection seat 14, and is conducive to reducing costs, energy conservation and emission reduction.
[0037] Further preferably, in order to further reduce the consumption of raw materials and avoid sharp corners to prevent operators from being scratched by sharp corners, the connecting seat 14 is in an elongated shape, and the end surface of the connecting seat 14 facing away from the buffer body 5 is an arcuate surface 16 facing the buffer body 5.
[0038] In order to increase the connection thickness of the plug assembly and improve assembly reliability, the exhaust channel 9 on the buffer container 3 is arranged on the connecting seat 14 and passes through the connecting seat 14. The exhaust channel 9 is arranged at an angle, and the inner end of the exhaust channel 9 faces the center of the buffer body 5.
[0039] The liquid level sensor involved in this technical solution is equipped with a liquid level relay, which receives the probe signal and forms an electrical signal to control the equipment alarm, start and stop and other functions. Specifically:
[0040] The positive and negative poles of the power supply of the liquid level relay are connected to the 220V power supply, and the two electrodes on the liquid level relay are connected to the two probes through the two wires 17 on the liquid level sensor base. The liquid level relay receives the probe signal for judgment and is used to feed back the signal to the PLC (such as Figure 2-Figure 4 The working principle of the liquid level relay in conjunction with the PLC for alarm is as follows:
[0041] 1. When using X-Y1 (water shortage alarm) control circuit:
[0042] 1.1. When the two probes touch the liquid at the same time, the liquid becomes a conductor, making the two electrodes conductive. The liquid level relay transmits no signal to the PLC, and no alarm is triggered.
[0043] 1.2. When the two probes are not in contact with the liquid, the two electrodes are disconnected. The liquid level relay transmits a signal to the PLC, which receives the electrical signal and triggers an alarm, thereby controlling the equipment to stop operating.
[0044] 2. When using X-Y2 (overflow alarm) control circuit:
[0045] 2.1. When the two probes touch the liquid at the same time, the two electrodes are turned on. The liquid level relay transmits a signal to the PLC, which triggers an alarm after receiving the electrical signal, and then controls the equipment to stop operating.
[0046] 2.2. When the two probes are not in contact with each other, the two electrodes are disconnected. The liquid level relay transmits no signal to the PLC and no alarm is triggered.
[0047] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. In the above embodiments, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.
Claims
1. A liquid level sensor, comprising a probe sensor, wherein the probe sensor comprises a base (1), a probe (2) with one end disposed on the base (1) and the other end extending outward, characterized in that A buffer container (3) is arranged on the seat body (1), a liquid inlet (4) is arranged at one end of the buffer container (3) away from the seat body (1), and the probe (2) is placed in the inner cavity of the buffer container (3).
2. The liquid level sensor according to claim 1, characterized in that The probe (2) is arranged along the axial direction of the buffer container (3), and the length of the probe (2) is smaller than the depth of the buffer container (3).
3. The liquid level sensor according to claim 1 or 2, characterized in that The buffer body (5) of the buffer container (3) is in the shape of a truncated cone, the first end (6) of the buffer body (5) is a large-diameter end, the first end (6) is connected to the base (1), and the second end (7) of the buffer body (5) is a small-diameter end, the second end (7) is used to form a connection with the detected device.
4. The liquid level sensor according to claim 3, characterized in that The second end (7) of the buffer body (5) is provided with an outwardly protruding connecting column (8), the connecting column (8) has an external thread, the diameter of the connecting column (8) is smaller than the diameter of the second end (7) of the buffer body (5), and the connecting column (8) is used to form a threaded connection with the detected device.
5. The liquid level sensor according to claim 1 or 2, characterized in that An exhaust channel (9) is provided on the buffer container (3), the exhaust channel (9) communicating with the inner cavity of the buffer container (3) and the external space of the buffer container (3), and a plug assembly is provided in the exhaust channel (9) for opening or closing the exhaust channel (9).
6. The liquid level sensor according to claim 5, characterized in that The plug assembly comprises an intermediate connecting piece (10) and a plug (11); the outer end of the exhaust passage (9) is provided with an internal thread, the inner end of the intermediate connecting piece (10) is an external thread end, the external thread end is inserted into the exhaust passage (9) and forms a threaded connection with the buffer container (3); the outer end of the intermediate connecting piece (10) is provided with a first connecting hole (12), the inner wall of the first connecting hole (12) has an internal thread, the connecting end of the plug (11) has an external thread, the connecting end of the plug (11) is inserted into the first connecting hole (12) and forms a threaded connection with the intermediate connecting piece (10).
7. The liquid level sensor according to claim 6, characterized in that The intermediate connecting piece (10) is provided with an exhaust through hole (13), the exhaust through hole (13) axially passes through the intermediate connecting piece (10), and the first connecting hole (12) is connected to the inner cavity of the buffer container (3) through the exhaust through hole (13).
8. The liquid level sensor according to claim 3, characterized in that The first end (6) of the buffer body (5) is provided with an outwardly protruding connection seat (14), the connection seat (14) is provided with a second connection hole (15) with an internal thread, and the connection part on the seat body (1) is inserted into the second connection hole (15) to form a threaded connection.
9. The liquid level sensor according to claim 8, characterized in that The connecting seat (14) is in the shape of an elongated strip, and the end surface of the connecting seat (14) facing away from the buffer body (5) is an arc-shaped surface (16) facing the buffer body (5).
10. The liquid level sensor according to claim 8, characterized in that The exhaust channel (9) on the buffer container (3) is arranged on the connecting seat (14) and passes through the connecting seat (14); the exhaust channel (9) is arranged obliquely, and the inner end of the exhaust channel (9) faces the center of the buffer body (5).