NTC liquid level sensor

Abstract

The utility model discloses an NTC (Negative Temperature Coefficient) liquid level sensor, which belongs to the technical field of liquid level sensors and comprises an NTC thermistor for detecting the liquid level, a mounting pipe capable of being connected to external equipment is arranged beside the NTC thermistor, and a lead is arranged in the mounting pipe. The NTC thermistor is provided with a first pin connected with the wire and a second pin arranged beside the first pin, the second pin is connected with the wire, the first pin is arranged in the mounting tube, and the second pin is arranged in the mounting tube. The method has the effects of reducing the influence of the solution density on the detection result and improving the detection accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level sensors, in particular to an NTC liquid level sensor. Background Art

[0002] The main function of the liquid level sensor is to detect and measure the liquid level. It is widely used in various industrial and civilian fields. The working principle of traditional liquid level sensors depends on the density of the liquid. Changes in liquid density will affect the measurement results. NTC thermistors are special semiconductor resistors whose resistance value decreases with increasing temperature. When the NTC thermistor encounters a solution, the NTC thermistor resistance value changes, thereby detecting the liquid level change, reducing the influence of the solution density on the detection results, and improving the accuracy of the detection.

[0003] In view of the above-mentioned related technologies, it is urgent to design and develop an NTC liquid level sensor to reduce the influence of solution density on the detection results and improve the accuracy of detection. Utility Model Content

[0004] In order to reduce the impact of solution density on detection results and improve detection accuracy, the present application provides an NTC liquid level sensor.

[0005] The NTC liquid level sensor provided in this application adopts the following technical solution:

[0006] An NTC liquid level sensor includes an NTC thermistor for detecting liquid level. A mounting tube that can be connected to an external device is provided next to the NTC thermistor, a wire is provided in the mounting tube, the NTC thermistor is provided with a pin 1 connected to the wire and a pin 2 provided next to the pin 1, the pin 2 is connected to the wire, the pin 1 is provided in the mounting tube, and the pin 2 is provided in the mounting tube.

[0007] By adopting the above technical solution, the mounting tube is connected to the external device, the wire is set in the mounting tube, the pin 1 on the NTC thermistor is connected to the wire, the pin 2 on the NTC thermistor is connected to the wire, the pin 1 is set in the mounting tube, and the pin 2 is set in the mounting tube. When it is necessary to detect the liquid level of the solution, after opening a hole in the device, the mounting tube is placed in the hole, and the NTC thermistor is in the position to be detected. When the liquid level changes and contacts the NTC thermistor, the NTC thermistor value changes, so that the liquid level change can be detected, reducing the influence of the solution density on the detection result and improving the accuracy of the detection.

[0008] Preferably, the mounting tube is sleeved in the equipment, a mounting hole is provided on the side of the equipment, the mounting tube is sleeved in the mounting hole, a mounting ring groove is provided on the outer circumferential side of the mounting tube, the mounting ring groove is connected to the end face of the mounting tube close to the NTC thermistor, and a protective mechanism is provided on the mounting tube, the protective mechanism includes a water-swelling waterstop ring provided in the mounting ring groove, and the side of the water-swelling waterstop ring is in contact with the inner wall of the mounting hole.

[0009] By adopting the above technical solution, the mounting tube is sleeved in the equipment, a mounting hole is opened on the side of the equipment, the mounting tube is sleeved in the mounting hole, a mounting ring groove is opened on the outer circumferential side of the mounting tube, the mounting ring groove is connected to the end face of the mounting tube close to the NTC thermistor, and a protective mechanism is provided on the mounting tube, the protective mechanism includes a water-expanding waterstop ring arranged in the mounting ring groove, the side of the water-expanding waterstop ring is in contact with the inner wall of the mounting hole, thereby improving the sealing between the mounting tube and the equipment.

[0010] Preferably, the protective mechanism includes a mounting ring block arranged on the end face of the mounting tube and a water-swelling waterstop ring 2 arranged in the mounting ring block, the mounting ring block is close to the NTC thermistor, the pin 1 passes through the water-swelling waterstop ring 2, and the pin 2 passes through the water-swelling waterstop ring 2.

[0011] By adopting the above technical solution, the mounting ring block is arranged on the end face of the mounting pipe, the water-expanding waterstop ring 2 is arranged in the mounting ring block, the mounting ring block is close to the NTC thermistor, pin one passes through the water-expanding waterstop ring 2, and pin two passes through the water-expanding waterstop ring 2, thereby improving the sealing of the mounting pipe.

[0012] Preferably, a second mounting ring groove is provided on the outer circumferential side surface of the mounting tube, and the second mounting ring groove is located in the middle position of the mounting tube. The protective mechanism includes a third water-swelling waterstop ring arranged in the second mounting ring groove, and the side surface of the third water-swelling waterstop ring fits with the inner wall of the mounting hole.

[0013] By adopting the above technical solution, a second mounting ring groove is opened on the outer circumferential side surface of the mounting pipe, and the second mounting ring groove is located in the middle position of the mounting pipe. The protective mechanism includes a water-expanding waterstop ring three arranged in the second mounting ring groove. The side surface of the water-expanding waterstop ring three fits with the inner wall of the mounting hole, further improving the sealing between the mounting pipe and the equipment.

[0014] Preferably, a hot melt adhesive layer is provided on the outside of the wire, a hot melt adhesive layer is provided on the outside of the first pin, and a hot melt adhesive layer is provided on the outside of the second pin.

[0015] By adopting the above technical solution, a hot melt adhesive layer is provided outside the wire, a hot melt adhesive layer is provided outside the pin 1, and a hot melt adhesive layer is provided outside the pin 2, thereby improving the stability of the connection between the wire and the pin 1 and the pin 2.

[0016] Preferably, a protective cover is threadedly provided on the end face of the mounting tube away from the NTC thermistor, a sealing ring 1 is provided on the protective cover, the sealing ring 1 is arranged in the mounting tube, the side of the sealing ring 1 is in contact with the inner wall of the mounting tube, the wire passes through the sealing ring 1, and the wire passes through the protective cover.

[0017] By adopting the above technical solution, a protective cover is threadedly provided on the end face of the mounting tube away from the NTC thermistor, a sealing ring 1 is provided on the protective cover, the sealing ring 1 is arranged in the mounting tube, the side of the sealing ring 1 is in contact with the inner wall of the mounting tube, the wire passes through the sealing ring 1, and the wire passes through the protective cover, thereby further improving the sealing performance of the mounting tube.

[0018] Preferably, a positioning ring is sleeved on the mounting tube, and a through screw is provided on the positioning ring, and the positioning ring can be connected to the equipment through the through screw.

[0019] By adopting the above technical solution, a positioning ring is provided on the mounting tube, and a through screw is provided on the positioning ring. The positioning ring can be connected to the device through the through screw, thereby improving the stability of the connection between the mounting tube and the device, thereby improving the stability of the connection between the NTC thermistor and the device.

[0020] Preferably, a protective washer is provided on the side of the positioning ring close to the device, the protective washer is in contact with the device, and the through screw passes through the protective washer.

[0021] By adopting the above technical solution, a protective washer is provided on the side of the positioning ring close to the equipment. The protective washer is in contact with the equipment, and the through screw passes through the protective washer, thereby improving the safety of the connection between the positioning ring and the equipment and reducing the possibility of the positioning ring damaging the surface of the equipment.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. The mounting tube is connected to the external device, the wire is set in the mounting tube, pin 1 on the NTC thermistor is connected to the wire, and pin 2 on the NTC thermistor is connected to the wire. Pin 1 is set in the mounting tube, and pin 2 is set in the mounting tube. When the liquid level needs to be detected, after opening a hole in the device, the mounting tube is placed in the hole, and the NTC thermistor is in the position to be detected. When the liquid level changes and contacts the NTC thermistor, the NTC thermistor value changes, so that the liquid level change can be detected, reducing the influence of the solution density on the test result and improving the accuracy of the test;

[0024] 2. The mounting tube is sleeved in the equipment. A mounting hole is provided on the side of the equipment. The mounting tube is sleeved in the mounting hole. A mounting ring groove is provided on the outer circumferential side of the mounting tube. The mounting ring groove is connected to the end face of the mounting tube close to the NTC thermistor. The mounting tube is provided with a protective mechanism, which includes a water-expandable water stop ring provided in the mounting ring groove. The side of the water-expandable water stop ring fits against the inner wall of the mounting hole to improve the sealing performance of the mounting tube.

[0025] 3. A positioning ring is provided on the mounting tube, and a through screw is provided on the positioning ring. The positioning ring can be connected to the device through the through screw, thereby improving the stability of the connection between the mounting tube and the device, thereby improving the stability of the connection between the NTC thermistor and the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the NTC liquid level sensor in the embodiment of the present application.

[0027] Figure 2 It is a schematic diagram of the internal structure of the installation tube in the embodiment of the present application.

[0028] Figure 3 yes Figure 2 A partial enlarged view of point A in the middle.

[0029] Description of reference numerals:

[0030] 1. Equipment; 11. Mounting hole; 2. Mounting tube; 21. Mounting ring groove 1; 22. Mounting ring groove 2; 23. Protective cover; 24. Sealing ring 1; 25. Positioning ring; 26. Through screw; 27. Protective washer; 3. NTC thermistor; 31. Pin 1; 32. Pin 2; 4. Protective mechanism; 41. Water-swelling waterstop 1; 42. Mounting ring block; 43. Water-swelling waterstop 2; 44. Water-swelling waterstop 3; 5. Wires. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-3 This application is described in further detail.

[0032] The present application embodiment discloses an NTC liquid level sensor, referring to Figure 1 and Figure 2 As shown, the NTC liquid level sensor includes a device 1, a mounting tube 2, an NTC thermistor 3 and a protective mechanism 4. The device 1 is horizontally arranged. In this embodiment, the device 1 is a wall, and other devices are also applicable.

[0033] Reference Figure 2 As shown, a mounting hole 11 is provided on the side of the device 1, and a mounting tube 2 is horizontally arranged in the mounting hole 11. The length direction of the mounting tube 2 is parallel to the ground, and the axial centerline direction of the mounting tube 2 coincides with the axial centerline direction of the mounting hole 11. A wire 5 is provided in the mounting tube 2, and the NTC thermistor 3 is arranged next to the mounting tube 2.

[0034] Reference Figure 2 As shown, the NTC thermistor 3 is provided with a pin 1 31 and a pin 2 32, the pin 1 31 is provided in the mounting tube 2, the pin 2 32 is provided in the mounting tube 2, the pin 1 31 is connected to the wire 5, the pin 2 32 is connected to the wire 5, a hot melt adhesive layer is provided on the outside of the wire 5, a hot melt adhesive layer is provided on the outside of the pin 1 31, and a hot melt adhesive layer is provided on the outside of the pin 2 32 to improve the stability of the connection between the wire 5 and the pin 1 31 and the pin 2 32.

[0035] Reference Figure 1 and Figure 2 As shown, when the liquid level of the solution needs to be detected, the mounting tube 2 is placed in the hole, and the NTC thermistor 3 is at the position to be detected. When the liquid level changes and contacts the NTC thermistor 3, the value of the NTC thermistor 3 changes, so that the liquid level change can be detected, reducing the influence of the solution density on the detection result and improving the accuracy of the detection.

[0036] Reference Figure 2 and Figure 3 As shown, a mounting ring groove 21 is provided on the outer circumferential side surface of the mounting tube 2, the axial centerline direction of the mounting ring groove 21 coincides with the axial centerline direction of the mounting tube 2, and the mounting ring groove 21 is connected to the end surface of the mounting tube 2 close to the NTC thermistor 3.

[0037] Reference Figure 2 and Figure 3 As shown, the protective structure includes a water-swellable waterstop ring 41, a mounting ring block 42, a water-swellable waterstop ring 2 43 and a water-swellable waterstop ring 3 44. The water-swellable waterstop ring 41 is arranged in the mounting ring groove 21. The axial direction of the water-swellable waterstop ring 41 coincides with the axial direction of the mounting ring groove 21. The side of the water-swellable waterstop ring 41 fits with the inner wall of the mounting hole 11, thereby improving the sealing between the mounting pipe 2 and the equipment 1.

[0038] Reference Figure 2 and Figure 3 As shown, the mounting ring block 42 is arranged on the end face of the mounting tube 2, and the axial direction of the mounting ring block 42 coincides with the axial direction of the mounting tube 2. The water-expandable waterstop ring 43 is arranged in the mounting ring block 42, and the axial direction of the water-expandable waterstop ring 43 coincides with the axial direction of the mounting ring block 42. The mounting ring block 42 is close to the NTC thermistor 3, the pin 1 31 passes through the water-expandable waterstop ring 43, and the pin 2 32 passes through the water-expandable waterstop ring 43, thereby improving the sealing performance of the mounting tube 2.

[0039] Reference Figure 2 and Figure 3 As shown, a second mounting ring groove 22 is provided on the outer circumferential side surface of the mounting tube 2, and the second mounting ring groove 22 is located in the middle position of the mounting tube 2. The axial centerline direction of the second mounting ring groove 22 coincides with the axial centerline direction of the mounting tube 2. A third water-swelling waterstop ring 44 is arranged in the second mounting ring groove 22. The side surface of the third water-swelling waterstop ring 44 fits with the inner wall of the mounting hole 11, thereby further improving the sealing between the mounting tube 2 and the equipment 1.

[0040] Reference Figure 2 As shown, a protective cover 23 is threadedly provided on the end face of the mounting tube 2 away from the NTC thermistor 3, and a sealing ring 24 is provided on the protective cover 23. The sealing ring 24 is arranged in the mounting tube 2, and the side of the sealing ring 24 is in contact with the inner wall of the mounting tube 2. The wire 5 passes through the sealing ring 24 and the protective cover 23, thereby further improving the sealing performance of the mounting tube 2.

[0041] Reference Figure 1 and Figure 2 As shown, a positioning ring 25 is sleeved on the mounting tube 2, and the axial centerline direction of the positioning ring 25 coincides with the axial centerline direction of the mounting tube 2. A through screw 26 is provided on the positioning ring 25, and the positioning ring 25 can be connected to the device 1 through the through screw 26, thereby improving the stability of the connection between the mounting tube 2 and the device 1, thereby improving the stability of the connection between the NTC thermistor 3 and the device 1.

[0042] Reference Figure 2 As shown, a protective washer 27 is provided on the side of the positioning ring 25 close to the device 1. The axial direction of the protective washer 27 coincides with the axial direction of the positioning ring 25. The protective washer 27 is in contact with the device 1, and the through screw 26 passes through the protective washer 27, thereby improving the safety of the connection between the positioning ring 25 and the device 1 and reducing the possibility of the positioning ring 25 damaging the surface of the device 1.

[0043] The implementation principle of an NTC liquid level sensor in the embodiment of the present application is as follows:

[0044] When the liquid level of the solution needs to be detected, the mounting tube 2 is placed in the hole, and the NTC thermistor 3 is at the position to be detected. When the liquid level changes and contacts the NTC thermistor 3, the value of the NTC thermistor 3 changes, so that the liquid level change can be detected, reducing the influence of the solution density on the detection result and improving the accuracy of the detection.

[0045] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. An NTC liquid level sensor, comprising an NTC thermistor (3) for detecting a liquid level, characterized in that: A mounting tube (2) that can be connected to an external device (1) is provided next to the NTC thermistor (3), a wire (5) is provided in the mounting tube (2), a pin 1 (31) connected to the wire (5) and a pin 2 (32) provided next to the pin 1 (31) are provided on the NTC thermistor (3), the pin 2 (32) is connected to the wire (5), the pin 1 (31) is provided in the mounting tube (2), and the pin 2 (32) is provided in the mounting tube (2).

2. The NTC liquid level sensor according to claim 1, characterized in that: The mounting tube (2) is sleeved in the device (1), a mounting hole (11) is provided on the side of the device (1), the mounting tube (2) is sleeved in the mounting hole (11), a mounting ring groove (21) is provided on the outer circumferential side of the mounting tube (2), the mounting ring groove (21) is connected to the end face of the mounting tube (2) close to the NTC thermistor (3), and a protective mechanism (4) is provided on the mounting tube (2), the protective mechanism (4) includes a water-expandable water stop ring (41) provided in the mounting ring groove (21), and the side of the water-expandable water stop ring (41) is in contact with the inner wall of the mounting hole (11).

3. The NTC liquid level sensor according to claim 2, characterized in that: The protective mechanism (4) comprises a mounting ring block (42) arranged on the end surface of the mounting tube (2) and a second water-swelling waterstop ring (43) arranged in the mounting ring block (42); the mounting ring block (42) is close to the NTC thermistor (3); the first pin (31) passes through the second water-swelling waterstop ring (43); and the second pin (32) passes through the second water-swelling waterstop ring (43).

4. The NTC liquid level sensor according to claim 2, characterized in that: A second mounting ring groove (22) is provided on the outer circumferential side surface of the mounting tube (2), and the second mounting ring groove (22) is located in the middle of the mounting tube (2). The protective mechanism (4) includes a third water-swelling water-stop ring (44) arranged in the second mounting ring groove (22), and the side surface of the third water-swelling water-stop ring (44) is in contact with the inner wall of the mounting hole (11).

5. The NTC liquid level sensor according to claim 1, characterized in that: The wire (5) is provided with a hot melt adhesive layer outside, the pin 1 (31) is provided with a hot melt adhesive layer outside, and the pin 2 (32) is provided with a hot melt adhesive layer outside.

6. The NTC liquid level sensor according to claim 1, characterized in that: A protective cover (23) is threadedly provided on the end face of the mounting tube (2) away from the NTC thermistor (3); a sealing ring (24) is provided on the protective cover (23); the sealing ring (24) is arranged in the mounting tube (2); the side of the sealing ring (24) is in contact with the inner wall of the mounting tube (2); the wire (5) passes through the sealing ring (24), and the wire (5) passes through the protective cover (23).

7. The NTC liquid level sensor according to claim 1, characterized in that: A positioning ring (25) is sleeved on the mounting tube (2), and a through-screw (26) is provided on the positioning ring (25). The positioning ring (25) can be connected to the device (1) via the through-screw (26).

8. The NTC liquid level sensor according to claim 7, characterized in that: A protective washer (27) is provided on the side of the positioning ring (25) close to the device (1). The protective washer (27) is in contact with the device (1), and the through screw (26) passes through the protective washer (27).

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