CN211527561U

CN211527561U - Liquid level sensor

Info

Publication number: CN211527561U
Application number: CN202020598314.7U
Authority: CN
Inventors: 苏映新; 赵娜
Original assignee: Eastern Liaoning University
Current assignee: Eastern Liaoning University
Priority date: 2020-04-20
Filing date: 2020-04-20
Publication date: 2020-09-18
Anticipated expiration: 2030-04-20

Abstract

The utility model provides a liquid level sensor, belonging to the technical field of sensors, comprising a fixing device, a driving device and a sensing device; the fixing device is arranged at the top of the tested bearing device, and at least one group of cylinders are arranged between the fixing device and the driving device; the sensing device is arranged below the driving device, and the driving device drives the sensing device to move up and down; the sensing device comprises a top plate, a bottom plate and a sleeve; two support rods are arranged between the top plate and the bottom plate, a sleeve is arranged between the two support rods, two ends of the sleeve are respectively and fixedly connected with the bottom of the top plate and the top of the bottom plate, a circuit board is arranged in the sleeve, and a plurality of magnetic reed switches are arranged on one side of the circuit board; floating balls are arranged on the two support rods, and a permanent magnet is fixedly arranged in one floating ball close to the magnetic reed switch. The device can stretch out and draw back sensing device to liquid level or position that awaits measuring, fixes on bearing device simultaneously, makes the sensor installation comparatively stable, and measurement accuracy is higher.

Description

Liquid level sensor

Technical Field

The utility model relates to a sensor technical field, concretely relates to level sensor.

Background

The liquid level sensors on the market are various and different in principle, wherein one type of sensors adopts the working principle of containing a permanent magnet floater, a magnetic reed switch and a static magnetic field to monitor the water level. When the water level rises and the floater with the permanent magnet moves under the action of buoyancy, namely the static magnetic field moves to enable the magnetic reed switch to generate on-off conversion, so that the liquid level information is obtained and is transmitted to the central processing unit for next operation.

Existing level sensors typically employ a tubular device and float in cooperation, requiring a reed switch to be mounted inside the tubular device. Because some liquid levels to be measured are low or deep, such as high petroleum storage tanks and the like, if the sensor is adopted, a long tubular device and a large number of magnetic reed switches are needed; meanwhile, the sensor cannot be reasonably fixed.

Therefore, the utility model provides a new level sensor.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, an object of the present invention is to provide a liquid level sensor. The device can stretch out and draw back sensing device to liquid level or position that awaits measuring, fixes on bearing device simultaneously, makes the sensor installation comparatively stable, and measurement accuracy is higher.

In order to achieve the above purpose, the utility model provides the following technical scheme.

A liquid level sensor comprises a fixing device, a driving device and a sensing device; at least one group of cylinders is arranged between the fixing device and the driving device; the sensing device is arranged below the driving device, and the driving device drives the sensing device to move up and down;

the sensing device comprises a top plate, a bottom plate and a sleeve; two support rods are arranged between the top plate and the bottom plate, a sleeve is arranged between the two support rods, two ends of the sleeve are fixedly connected with the bottom of the top plate and the top of the bottom plate respectively, a circuit board is arranged in the sleeve, a plurality of magnetic reed switches are arranged on one side of the circuit board, and each magnetic reed switch is electrically connected with the circuit board; floating balls are arranged on the two support rods, and a permanent magnet is fixedly arranged in one floating ball close to the magnetic reed switch.

Preferably, the driving device comprises a supporting plate, a driving motor, an electric telescopic rod and a telescopic polished rod; the driving motor is fixedly arranged at the top of the supporting plate, an output shaft of the driving motor penetrates through the supporting plate to drive the electric telescopic rod to stretch, one end of the telescopic polished rod is fixedly connected with the bottom of the supporting plate, and the lower end of the electric telescopic rod and the other end of the telescopic polished rod are fixedly connected with the top of the top plate.

Preferably, the fixing device comprises an L-shaped fixing piece and a plurality of fixing bolts; the L-shaped fixing piece is fixedly arranged at the top of the tested bearing device through the fixing bolt, the air cylinder is fixedly connected with one side of the L-shaped fixing piece, and the top end of the push rod of the air cylinder is fixedly connected with one side of the supporting plate.

Preferably, one side of the floating ball close to the sleeve is a plane, and the distance between the plane of the sleeve and the sleeve is 1mm +/-0.5 mm.

Preferably, a plurality of the reed switches are arranged on the circuit board in sequence from top to bottom side by side.

Preferably, a photoelectric switch is also included; the photoelectric switch is fixed on the upper part of the sleeve.

The utility model discloses beneficial effect:

the utility model provides a liquid level sensor. The device can be adjusted according to the actual condition of the liquid bearing device to be measured, and the liquid level sensor is fixed through the fixing device, so that the whole sensing device is more stable; the device can stretch the sensing device to the liquid level or the position to be measured, can be effectively adapted to various test occasions, is suitable for the liquid level of the liquid level to be measured to be lower or the liquid level to be deeper, and enables the liquid level measurement precision to be higher; the moving distance of the sensing device of the device is limited through the photoelectric switch, and the control is simple.

The present invention will be further described with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is an overall block diagram of a level sensor according to an embodiment of the present invention;

FIG. 2 is a diagram of an installation configuration of a level sensor according to an embodiment of the present invention;

FIG. 3 is a diagram of a fixture for a level sensor according to an embodiment of the present invention;

fig. 4 is a structure diagram of the inside of the sleeve of the liquid level sensor according to the embodiment of the present invention.

In the figure: 1. a base plate; 2. a support bar; 3. a floating ball; 4. a top plate; 5. an electric telescopic rod; 6. a support plate; 7. a cylinder; 8. an L-shaped fixing member; 9. a drive motor; 10. a telescopic polished rod; 11. a photoelectric switch; 12. a sleeve; 13. a reed switch; 14. a circuit board.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Examples

A liquid level sensor, as shown in fig. 1-4, comprising a fixing means, a driving means and a sensing means; at least one group of cylinders 7 is arranged between the fixing device and the driving device; the sensing device is arranged below the driving device, and the driving device drives the sensing device to move up and down;

the sensing device comprises a top plate 4, a bottom plate 1 and a sleeve 12, as shown in the installation schematic of fig. 2; two support rods 2 are arranged between the top plate 4 and the bottom plate 1, a sleeve 12 is arranged between the two support rods 2, two ends of the sleeve 12 are fixedly connected with the bottom of the top plate 4 and the top of the bottom plate 1 respectively, a circuit board 14 is arranged in the sleeve 12, a plurality of magnetic reed switches 13 are arranged on one side of the circuit board 14, and each magnetic reed switch 13 is electrically connected with the circuit board 14; floating balls 3 are arranged on the two support rods 2, and a permanent magnet is fixedly arranged in one floating ball 3 close to the magnetic reed switch 13; when the floating ball 3 floats upwards, the magnetic reed switch 13 is switched on or off, and the liquid level can be effectively and accurately judged.

Preferably, the driving device comprises a supporting plate 6, a driving motor 9, an electric telescopic rod 5 and a telescopic polished rod 10; the driving motor 9 is fixedly arranged at the top of the supporting plate 6, an output shaft of the driving motor 9 penetrates through the supporting plate 6 to drive the electric telescopic rod 5 to stretch, one end of the telescopic polished rod 10 is fixedly connected with the bottom of the supporting plate 6, and the lower end of the electric telescopic rod 5 and the other end of the telescopic polished rod 10 are fixedly connected with the top of the top plate 4; the motor controls the electric telescopic rod 5 to stretch out and draw back so that the whole sensing device moves, the position of the sensing device is adjusted, and the detection of occasions with lower liquid levels is facilitated.

Further, the fixing device comprises an L-shaped fixing piece 8 and a plurality of fixing bolts; the L-shaped fixing piece 8 is fixedly arranged at the top of the bearing device to be tested through a fixing bolt, one end of the air cylinder 7 is fixedly connected with one side of the L-shaped fixing piece 8, and the other end of the air cylinder 7 is fixedly connected with one side of the supporting plate 6; the fixable range of the fixing device is effectively increased.

In addition, one side of the floating ball 3 close to the sleeve 12 is a plane, the distance between the plane of the sleeve 12 and the sleeve 12 is 1mm +/-0.5 mm, and the detection can be more accurate due to the close distance; several reed switches 13 are arranged side by side on a circuit board 14.

In addition, the device also comprises a photoelectric switch 11; the photoelectric switch 11 is fixed on the upper part of the sleeve 12.

In the embodiment, a controller is used for detecting the liquid level and controlling a small air pump and a driving motor 9 which are required by driving a photoelectric switch 11 and an air cylinder 7;

fixing the fixing device at the upper edge of the liquid bearing device to be detected, and fixedly connecting the fixing device with the liquid bearing device by using a fixing bolt; controlling the two cylinders 7 to stretch and retract, and moving the whole sensing device to a more reasonable liquid measuring position; controlling the driving motor 9 to rotate, enabling the whole sensing device to move downwards to a position below the liquid level, judging whether the position exceeds the lowest position which can be used for measurement by the liquid level sensor through the photoelectric switch 11, stopping descending when the photoelectric switch 11 arranged at the top of the sleeve 12 touches the liquid level, and ascending for a certain distance, and counting the telescopic length of the electric telescopic rod 5 as the reference length for liquid level measurement;

when the liquid level changes, float 3 reciprocates for the magnetic reed switch 13 of contact magnetic field is closed because the definite magnetic field is removing, because the magnetic reed switch 13 of a plurality of numbers is arranged side by side, acquires corresponding magnetic reed switch 13's the switching condition through the controller, and then acquires real-time liquid level value.

In this embodiment, the photoelectric switch 11 can be used to determine whether the liquid level exceeds the range.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. A liquid level sensor is characterized by comprising a fixing device, a driving device and a sensing device; at least one group of cylinders (7) is arranged between the fixing device and the driving device; the sensing device is arranged below the driving device, and the driving device drives the sensing device to move up and down;

the sensing device comprises a top plate (4), a bottom plate (1) and a sleeve (12); two support rods (2) are arranged between the top plate (4) and the bottom plate (1), a sleeve (12) is arranged between the two support rods (2), two ends of the sleeve (12) are fixedly connected with the bottom of the top plate (4) and the top of the bottom plate (1) respectively, a circuit board (14) is arranged in the sleeve (12), a plurality of magnetic reed switches (13) are arranged on one side of the circuit board (14), and each magnetic reed switch (13) is electrically connected with the circuit board (14); floating balls (3) are arranged on the two support rods (2), and a permanent magnet is fixedly arranged in one floating ball (3) close to the magnetic reed switch (13).

2. The level sensor according to claim 1, characterized in that said drive means comprise a support plate (6), a drive motor (9), an electric telescopic rod (5) and a telescopic polished rod (10); the driving motor (9) is fixedly arranged at the top of the supporting plate (6), an output shaft of the driving motor (9) penetrates through the supporting plate (6) to drive the electric telescopic rod (5) to stretch, one end of the telescopic polished rod (10) is fixedly connected with the bottom of the supporting plate (6), and the lower end of the electric telescopic rod (5) and the other end of the telescopic polished rod (10) are fixedly connected with the top of the top plate (4).

3. A level sensor according to claim 2, wherein the fixing means comprises an L-shaped fixing member (8) and a number of fixing bolts; the L-shaped fixing piece (8) is fixedly arranged at the top of the tested bearing device through the fixing bolt, the air cylinder (7) is fixedly connected with one side of the L-shaped fixing piece (8), and the top end of a push rod of the air cylinder (7) is fixedly connected with one side of the supporting plate (6).

4. Level sensor according to claim 1, characterised in that the side of the floating ball (3) close to the sleeve (12) is a plane, the plane of the sleeve (12) being at a distance of 1mm ± 0.5mm from the sleeve (12).

5. The liquid level sensor according to claim 1, wherein a plurality of the reed switches (13) are arranged on the circuit board (14) side by side from top to bottom.

6. A liquid level sensor according to claim 1, further comprising an opto-electronic switch (11); the photoelectric switch (11) is fixed on the upper part of the sleeve (12).