A liquid level switch calibration device
Patent Information
- Application Number
- CN202521754440.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-18
- Publication Date
- 2026-10-23
- Estimated Expiration
- 2035-08-18
AI Technical Summary
出厂时会在液位开关上标识出最高水位线（H线）和最低水位线（L线），但在液位开关的安装前还是需要对H线和L线进行校准，并标识出校准后的H线和L线，校准后才能进行安装，而且由于液位开关大多为焊接固定，拆装困难，如校准出错拆卸重校的过程相当麻烦，液位开关常规校准方式为用透明软管作为连通管校准或将液位开关置于水池中校准，常规校准方式需手持连通管,操作难规范，液位不稳固，易产生误差；试验介质流速不稳定，易产生气泡，影响校准效果，无法满足液位开关在安装前精准可靠的校准需求
本实用新型的液位开关校准装置，校准管路包括导流管和校准管，校准管为沿垂向设置的透明管，校准前将液位开关中的微动开关与万用表连接并将球阀关闭使导流管只能进液不能出液，校准时向导流管中缓慢匀速加入液体，液体从导流管流至液位开关和校准管中，当听到液位开关发出第一次提示声时停止向导流管加液，此时万用表测量到液位开关中的微动开关闭合，查看校准管上的液位高度并用标尺将校准管上的液位高度标记在液位开关上，形成校准H线，然后将球阀开度打到不超过50%，使液位开关、导流管、校准管内的液体缓慢排出，当听到液位开关发出第二次提示声时立即关闭球阀，此时万用表测量到液位开关中的微动开关断开，查看校准管上的液位高度并用标尺将校准管上的液位高度标记在液位开关上，形成校准L线，之后打开球阀将液位开关、导流管和校准管内的液体全部排出，重复上述过程，对形成的校准L线和校准H线进行检验，如检验合格则完成校准，如检验不合格则重复上述过程直至检验合格；通过设置透明的校准管可在加液过程中实时查看液位变化，将校准管与液位开关靠近设置，用液位开关随液位的变化形成通断时校准管的液位高度来校准液位开关的H线和L线，保证液位的稳定性，提高校准的精准性和操作规范性，提高校准效果，实现直观、精准和规范的校准，保证液位开关在安装前的校准有效性和可靠性，有效降低液位开关因校准出错而拆装的概率。
Smart Images
Figure CN224888061U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a liquid level switch calibration device for calibrating liquid level switches. Background Technology
[0002] A mechanical level switch is a device that uses physical buoyancy and a mechanical transmission structure to detect and control the liquid level. Its core working principle relies on the rising and falling motion of a float to trigger an internal switching mechanism. The highest water level line (H-line) and the lowest water level line (L-line) are marked on the level switch at the factory. However, before installation, the H-line and L-line need to be calibrated, and the calibrated H-line and L-line should be marked. Installation can only proceed after calibration. Furthermore, since most level switches are welded in place, disassembly and reassembly are difficult. If calibration is incorrect, the process of disassembly and recalibration is quite troublesome. Conventional calibration methods for level switches involve using a transparent flexible tube as a connecting pipe or placing the level switch in a water tank. Conventional calibration methods require holding the connecting pipe, making operation difficult to standardize, and the unstable liquid level can easily introduce errors. The unstable flow rate of the test medium can also easily generate air bubbles, affecting the calibration effect and failing to meet the requirement for accurate and reliable calibration of level switches before installation. Utility Model Content
[0003] This utility model provides a liquid level switch calibration device that improves the accuracy and standardization of calibration, enhances calibration results, achieves intuitive, accurate and standardized calibration, ensures the effectiveness and reliability of liquid level switch calibration before installation, and effectively reduces the probability of disassembly and reassembly of liquid level switch due to calibration errors.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A liquid level switch calibration device includes a test bench, characterized in that: a support frame is fixed on the test bench, a calibration pipeline is fixed on the support frame, the liquid level switch is horizontally supported on the support frame, the calibration pipeline includes a guide pipe connected to the liquid inlet of the liquid level switch, a calibration pipe connected to the guide pipe, and a ball valve for controlling the water outlet of the guide pipe, the calibration pipe being a transparent pipe arranged vertically and close to the liquid level switch.
[0005] Preferably, the guide pipe includes an inlet pipe with a funnel-shaped upper end, a connecting pipe that connects to the inlet of the level switch, and an outlet pipe that connects to the lower end of the inlet pipe. The outlet pipe is horizontally arranged and connected to the lower ends of the connecting pipe and the calibration pipe respectively. The inlet pipe, the connecting pipe, and the calibration pipe are arranged in parallel in sequence. The level switch is located between the inlet pipe and the calibration pipe, and the ball valve is installed on the outlet pipe and located outside the calibration pipe.
[0006] Preferably, the support frame includes a vertical support fixed to the test bench, a horizontal support fixed to the vertical support and arranged horizontally, a calibration tube, an inlet pipe and an outlet pipe are all fixed on the vertical support, the horizontal support has an arc-shaped support section, the liquid level switch is supported on the arc-shaped support section, and the liquid level switch inlet protrudes from the arc-shaped support section and connects to the upper end of the connecting pipe.
[0007] Preferably, the inlet pipe, connecting pipe, calibration pipe and outlet pipe are all transparent pipes made of acrylic material, and the vertical support and horizontal support are all made of galvanized sheet.
[0008] Preferably, the test bench consists of four galvanized steel pipes and a wooden plate fixed on the galvanized steel pipes, with the support frame fixed on the wooden plate.
[0009] Preferably, it also includes a liquid receiving tank placed below the water outlet pipe.
[0010] The beneficial effects of this utility model are: This utility model discloses a liquid level switch calibration device. The calibration pipeline includes a guide tube and a calibration tube. The calibration tube is a transparent tube arranged vertically. Before calibration, the microswitch in the liquid level switch is connected to a multimeter, and the ball valve is closed so that liquid can only enter the guide tube but not exit. During calibration, liquid is slowly and uniformly added to the guide tube. The liquid flows from the guide tube to the liquid level switch and the calibration tube. When the liquid level switch emits its first beep, the addition of liquid to the guide tube is stopped. At this time, the multimeter measures that the microswitch in the liquid level switch is closed. The liquid level height on the calibration tube is checked and marked on the liquid level switch with a scale to form a calibration H-line. Then, the ball valve is opened to no more than 50%, allowing the liquid in the liquid level switch, guide tube, and calibration tube to slowly drain. When the liquid level switch emits its second beep, the ball valve is immediately closed. At this time, the multimeter measures that the microswitch in the liquid level switch is open. Observe the liquid level height on the calibration tube and mark it on the level switch with a ruler to form the calibration L-line. Then, open the ball valve to drain all the liquid in the level switch, guide tube, and calibration tube. Repeat the above process and check the formed calibration L-line and calibration H-line. If the check is qualified, the calibration is complete. If the check is unqualified, repeat the above process until the check is qualified. By setting a transparent calibration tube, the liquid level change can be observed in real time during the liquid addition process. Place the calibration tube close to the level switch and use the liquid level height of the calibration tube when the level switch changes with the liquid level to calibrate the H-line and L-line of the level switch. This ensures the stability of the liquid level, improves the accuracy and standardization of the calibration, improves the calibration effect, and achieves intuitive, accurate, and standardized calibration. It ensures the effectiveness and reliability of the level switch calibration before installation and effectively reduces the probability of disassembly and reassembly of the level switch due to calibration errors. Attached Figure Description
[0011] Figure 1 The front view of the liquid level switch supported on a liquid level switch calibration device according to this utility model.
[0012] Figure 2 A side view of a liquid level switch supported on a liquid level switch calibration device according to this utility model. Detailed Implementation
[0013] The following is combined with Figures 1-2 The embodiments of this utility model will be described in detail below.
[0014] A liquid level switch calibration device includes a test bench 1, characterized in that: a support frame 2 is fixed on the test bench 1, a calibration pipeline 3 is fixed on the support frame 2, a liquid level switch 100 is horizontally supported on the support frame 2, the calibration pipeline 3 includes a guide pipe 4 connected to the liquid inlet of the liquid level switch 100, a calibration pipe 5 connected to the guide pipe 4, and a ball valve 6 for controlling the water outlet of the guide pipe 4, the calibration pipe 5 is a transparent pipe arranged vertically and close to the liquid level switch 100.
[0015] The liquid level switch calibration device described above includes a calibration pipe 3 comprising a guide pipe 4 and a calibration pipe 5. The calibration pipe 5 is a transparent pipe arranged vertically. Before calibration, the microswitch in the liquid level switch 100 is connected to a multimeter, and the ball valve 6 is closed so that the guide pipe 4 can only receive liquid but not receive it. During calibration, liquid is slowly and uniformly added to the guide pipe 4. The liquid flows from the guide pipe 4 to the liquid level switch 100 and the calibration pipe 5. When the liquid level switch 100 emits its first beep, the addition of liquid to the guide pipe is stopped. At this time, the multimeter measures that the microswitch in the liquid level switch is closed. The liquid level height on the calibration pipe 5 is checked and marked on the liquid level switch 100 with a scale to form a calibration H-line. Then, the ball valve is opened to no more than 50%, allowing the liquid in the liquid level switch 100, the guide pipe 4, and the calibration pipe 5 to slowly drain out. When the liquid level switch 100 emits its second beep, the ball valve 6 is immediately closed. At this time, the multimeter measures that the microswitch in the liquid level switch is closed. After disconnecting the liquid level, check the liquid level on calibration tube 5 and mark it on level switch 100 with a ruler to form calibration L line. Then, open ball valve 6 to drain all liquid from level switch 100, guide tube 4, and calibration tube 5. Repeat the above process to check the formed calibration L line and calibration H line. If the check is qualified, the calibration is complete. If the check is unqualified, repeat the above process until the check is qualified. By setting a transparent calibration tube 5, the liquid level change can be viewed in real time during liquid addition. Place calibration tube 5 close to level switch 100, and use the liquid level height of calibration tube 5 when level switch 100 changes with the liquid level to calibrate the H line and L line of level switch. This ensures the stability of liquid level, improves the accuracy and standardization of calibration, improves the calibration effect, and achieves intuitive, accurate, and standardized calibration. It ensures the effectiveness and reliability of level switch calibration before installation and effectively reduces the probability of disassembly and reassembly due to calibration errors.
[0016] The guide pipe 4 includes an inlet pipe 41 with a funnel-shaped upper end, a connecting pipe 42 that connects to the inlet of the liquid level switch 100, and an outlet pipe 43 that connects to the lower end of the inlet pipe. The outlet pipe 43 is horizontally arranged and connected to the lower ends of the connecting pipe 42 and the calibration pipe 5 respectively. The inlet pipe 41, the connecting pipe 42, and the calibration pipe 5 are arranged in parallel in sequence. The liquid level switch 100 is located between the inlet pipe 41 and the calibration pipe 5. The ball valve 6 is installed on the outlet pipe 43 and is located outside the calibration pipe 5. As shown in the figure, the inlet pipe 41, connecting pipe 42, and calibration pipe 5 are all arranged vertically. The level switch 100 is supported between the inlet pipe 41 and the calibration pipe 5. When the ball valve 5 is closed, liquid is slowly and uniformly added from the upper end of the inlet pipe 41. The liquid enters the level switch 100 through the connecting pipe 42 and simultaneously enters the calibration pipe 5. The liquid level in the calibration pipe 5 changes synchronously with the liquid level in the level switch 100. Therefore, the liquid level in the calibration pipe 5 can be used to calibrate the liquid level in the level switch 100 when it is switched on or off due to liquid level changes, thereby improving the reliability and standardization of calibration.
[0017] The support frame 2 includes a vertical support 21 fixed to the test bench 1 and a horizontal support 22 fixed to the vertical support 21 and arranged horizontally. The calibration pipe 5, inlet pipe 41, and outlet pipe 43 are all fixed to the vertical support 21. The horizontal support 22 has an arc-shaped support section 23, on which the level switch 100 is supported. The inlet of the level switch 100 extends through the arc-shaped support section 23 and connects to the upper end of the connecting pipe 22. The vertical support 21 and the horizontal support 22 are mounted on the test bench 1 to position the calibration pipeline 2. The level switch 100 is placed on the arc-shaped support section 23, forming a stable support structure. This ensures the stability of the liquid level during calibration and improves the reliability of the calibration.
[0018] The inlet pipe 41, connecting pipe 42, calibration pipe 5, and outlet pipe 43 are all transparent acrylic pipes, while the vertical support 21 and horizontal support 22 are made of galvanized sheet. The transparent acrylic pipes are lightweight, corrosion-resistant, and easy to assemble and connect. The galvanized sheet has excellent corrosion resistance, effectively extending the service life of the entire calibration device.
[0019] The test bench 1 consists of four galvanized steel pipes 11 and a wooden plate 12 fixed on the galvanized steel pipes 11, with a support frame 2 fixed on the wooden plate 12. The galvanized steel pipes 11 are corrosion-resistant, and the wooden plate 12 is corrosion-resistant, lightweight, and easy to drill holes in to form a fixed structure with the galvanized steel pipes 11.
[0020] This also includes a liquid receiving tank 7 placed below the water outlet pipe 43. The liquid receiving tank 7 receives the liquid discharged from the water outlet pipe 43, allowing the liquid to be reused and reducing waste.
[0021] The technical solutions of the embodiments of this utility model have been fully described above with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
Claims
1. A liquid level switch calibration device, comprising a test bench, characterized in that: A fixed support frame is placed on the test bench, and a calibration pipeline is fixed on the support frame. The liquid level switch is horizontally supported on the support frame. The calibration pipeline includes a guide pipe connected to the liquid inlet of the liquid level switch, a calibration pipe connected to the guide pipe, and a ball valve that controls the water outlet of the guide pipe. The calibration pipe is a transparent pipe arranged vertically and close to the liquid level switch.
2. The liquid level switch calibration device according to claim 1, characterized in that: The guide pipe includes an inlet pipe with a funnel-shaped upper end, a connecting pipe that connects to the inlet of the level switch, and an outlet pipe that connects to the lower end of the inlet pipe. The outlet pipe is horizontally arranged and connected to the lower ends of the connecting pipe and the calibration pipe respectively. The inlet pipe, the connecting pipe and the calibration pipe are arranged in parallel in sequence. The level switch is located between the inlet pipe and the calibration pipe. The ball valve is installed on the outlet pipe and is located outside the calibration pipe.
3. The liquid level switch calibration device according to claim 2, characterized in that: The support frame includes a vertical support fixed to the test bench, a horizontal support fixed to the vertical support and set horizontally, a calibration tube, an inlet pipe and an outlet pipe are all fixed on the vertical support, the horizontal support has an arc-shaped support section, the liquid level switch is supported on the arc-shaped support section, and the liquid level switch inlet protrudes through the arc-shaped support section and connects to the upper end of the connecting pipe.
4. The liquid level switch calibration device according to claim 2, characterized in that: The inlet pipe, connecting pipe, calibration pipe, and outlet pipe are all transparent pipes made of acrylic material, and the vertical and horizontal support components are all made of galvanized sheet.
5. The liquid level switch calibration device according to claim 1, characterized in that: The test bench consists of four galvanized steel pipes and a wooden plate fixed on the galvanized steel pipes, with the support frame fixed on the wooden plate.
6. The liquid level switch calibration device according to claim 2, characterized in that: It also includes a liquid receiving tank placed below the water outlet pipe.