CN211904306U - Liquid level sensor - Google Patents

Abstract

The utility model discloses a liquid level sensor, including gas collecting channel and the first end that has the gas collecting chamber set firmly the confined chamber that holds and the second end sets firmly in the gas guide cover of gas collecting chamber, the gas collecting channel is equipped with the feed liquor hole, holds the intracavity and has set firmly the pressure measurement spare. The liquid flowing into the liquid inlet hole of the gas collecting hood compresses the gas in the gas collecting hood from bottom to top to the top of the gas collecting cavity, the gas guide sleeve guides the compressed air to the pressure detection piece fixedly connected with the gas guide sleeve from top to bottom, the pressure detection piece directly detects the pressure of the compressed air, the original liquid pressure of a detection object is converted into gas pressure, the liquid pressure detection is prevented from being influenced by a water film, the detection is convenient, the structure is simple, and the gas collecting hood is suitable for wide application.

Description

Liquid level sensor

Technical Field

The utility model relates to a sensor technical field, in particular to liquid level sensor.

Background

The liquid level sensor converts static pressure into an electric signal, and converts a standard electric signal through temperature compensation and linear correction so as to detect the liquid level in real time, and the liquid level sensor is widely applied to the industries of chemical industry, metallurgy, electric power, pharmacy, environmental protection and the like.

The existing liquid level sensor mostly adopts a reed switch sensing technology, so that the liquid level sensor can only sense preset water level, and the application range is limited. Although the liquid level sensor applying the electric control plate capacitance sensing technology can sense the liquid level in real time, the liquid level sensor has low conductivity and high reject ratio and is difficult to be widely applied. In addition, there are liquid level sensors using ultrasonic technology and radar technology, but these sensors have problems such as high manufacturing cost and difficulty in wide application.

Therefore, how to develop a liquid level sensor suitable for wide application is a technical problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, an object of the present invention is to provide a hydraulic sensor, which flows into the air in the gas-collecting hood to compress the liquid therein, so that the detected object is converted from the original liquid pressure into gas pressure, and the detection is convenient, has a simple structure, and is suitable for wide application.

The utility model provides a level sensor, include:

the gas collecting hood is provided with a gas collecting cavity, the gas collecting hood is provided with a liquid inlet, and liquid flowing in from the liquid inlet is used for compressing air in the gas collecting cavity to the top of the gas collecting cavity from bottom to top;

the first end sets firmly the confined chamber that holds and the second end sets firmly the air guide cover in the gas collection intracavity, holds the intracavity and sets firmly pressure measurement spare, and the air guide cover is used for leading the compressed air top-down at gas collection chamber top to pressure measurement spare in order to realize detecting.

Preferably, the gas collecting device further comprises a connecting sleeve fixedly arranged between the gas guide sleeve and the gas collecting hood.

Preferably, the connecting sleeve is in threaded connection with the air guide sleeve, and the connecting sleeve is connected with the air collecting hood through a plurality of groups of mutually matched limiting clamping grooves and limiting clamping columns.

Preferably, the gas collecting hood is arranged in the water tank, and the gas guide sleeve is used for penetrating through the mounting plate of the water tank until abutting against the limiting plate in the gas collecting cavity.

Preferably, the mounting panel is equipped with the mounting hole, still including the cover locate the air guide cover and with the first sealing member of the hole edge counterbalance of mounting hole in order to seal the mounting hole.

Preferably, the first end of the air guide sleeve is fixedly provided with a stop plate which is abutted against the mounting hole, the stop plate is provided with an avoiding hole, and the pressure detection piece comprises a detection circuit board and a guide sleeve which penetrates through the avoiding hole to guide compressed air in the air guide sleeve to the detection circuit board.

Preferably, the guide sleeve further comprises a second sealing element fixedly sleeved on the guide sleeve and abutted against the edge of the avoiding hole to seal the avoiding hole.

Preferably, the backstop board has the holding tank, and the opening of holding tank has set firmly the end cover board, and the backstop board encloses with the end cover board and becomes to hold the chamber.

Preferably, the bottom cover plate is fixedly provided with an abutting projection abutting against the pressure detection piece.

Preferably, the second end of the air guide sleeve is provided with a waterproof and breathable film.

For background art, the utility model provides a level sensor, including gas collecting channel and air guide sleeve, the liquid that flows in by the feed liquor hole of gas collecting channel compresses the gas in the gas collecting channel to the top of gas collecting chamber from bottom to top, and the air guide sleeve will be guided to the pressure detection spare that links firmly with it by compressed air top-down, and pressure detection spare direct detection compressed air's pressure will detect the object and convert the gas pressure into by original liquid pressure, avoids the water film to influence liquid pressure and detects, and it is convenient to detect, simple structure, is suitable for wide application.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is an isometric view of a level sensor provided in an embodiment of the present invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a bottom view of FIG. 1;

FIG. 4 is a sectional view taken along line A-A of FIG. 3;

fig. 5 is a block diagram of the gas collection enclosure of fig. 1;

FIG. 6 is a block diagram of the air guide sleeve of FIG. 1;

FIG. 7 is a cross-sectional view of the air guide sleeve of FIG. 1;

fig. 8 is a structural view of the connecting sleeve in fig. 1;

fig. 9 is an assembled cross-sectional view of the pressure detector and the bottom cover plate in fig. 1.

The reference numbers are as follows:

a mounting plate 01;

the gas collecting hood comprises a gas collecting hood 1, a gas guide sleeve 2, a connecting sleeve 3, a pressure detection piece 4, a first sealing piece 5, a second sealing piece 6, a bottom cover plate 7 and a waterproof breathable film 8;

the gas collection cavity 11, the liquid inlet hole 12, the limiting clamping groove 13 and the limiting plate 14;

the accommodating cavity 21, the stop plate 22 and the avoidance hole 23;

a limit clamp column 31;

a guide sleeve 41;

abutting against the projection 71.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the technical field of the present invention better understand, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 9, fig. 1 is an axial view of a liquid level sensor according to an embodiment of the present invention; FIG. 2 is a front view of FIG. 1; FIG. 3 is a bottom view of FIG. 1; FIG. 4 is a sectional view taken along line A-A of FIG. 3; fig. 5 is a block diagram of the gas collection enclosure of fig. 1; FIG. 6 is a block diagram of the air guide sleeve of FIG. 1; FIG. 7 is a cross-sectional view of the air guide sleeve of FIG. 1; fig. 8 is a structural view of the connecting sleeve in fig. 1; fig. 9 is an assembled cross-sectional view of the pressure detector and the bottom cover plate in fig. 1.

The embodiment of the utility model discloses a liquid level sensor, including gas collecting channel 1 and air guide sleeve 2.

The gas-collecting channel 1 is an open-type shell, the bottom end of which is provided with an opening and the top end of which is closed. The center of the gas-collecting hood 1 is provided with a gas-collecting cavity 11. The gas collecting hood 1 is provided with a liquid inlet hole 12, the liquid inlet hole 12 is arranged at one end of the gas collecting hood 1 close to the opening of the gas collecting hood, so that liquid flows into the gas collecting cavity 11 from the bottom of the gas collecting cavity 11 to the top of the gas collecting cavity 11 from bottom to top, and the air in the gas collecting cavity 11 is compressed by the liquid flowing in from the liquid inlet hole 12.

In a specific embodiment, based on the current view of fig. 1, the side surface of the gas collecting channel 1 is cylindrical, and the side surface of the gas collecting channel 1 is provided with three liquid inlet holes 12 which are uniformly distributed in a circular ring shape, and the setting height and the cross-sectional area of the liquid inlet holes 12 are set according to the actual situation, and are not described herein again.

The center cavity of air guide sleeve 2, its first end sets firmly confined chamber 21 that holds, holds and has set firmly pressure measurement spare 4 in the chamber 21, holds chamber 21 and can make pressure measurement spare 4 separate with liquid, prevents that liquid from influencing pressure measurement spare 4 and normally works. The second end of the air guide sleeve 2 is fixedly arranged in the air collection cavity 11 so as to guide the compressed air at the top of the air collection cavity 11 to the pressure detection piece 4 from top to bottom, and the pressure detection piece 4 directly detects the pressure of the compressed air.

It should be noted that, in order to ensure that the top of the gas collecting cavity 11 can collect compressed air with a certain volume, the heights of the gas collecting cavity 11 and the gas guide sleeve 2 can be set according to actual conditions, and are not limited herein.

The utility model provides a level sensor can be gas pressure with the converting of detection object by original liquid pressure, avoids the water film to influence liquid pressure and detects, and it is convenient to detect, simple structure, so be suitable for the wide application.

The utility model discloses still including setting firmly adapter sleeve 3 between air guide sleeve 2 and gas collecting channel 1, realize linking firmly between messenger air guide sleeve 2 and the gas collecting channel 1.

In this embodiment, the connection sleeve 3 is screwed to the air guide sleeve 2. Specifically, the first end of the air guide sleeve 2 is provided with an external thread, and the central hole of the connecting sleeve 3 is provided with an internal thread. The connecting sleeve 3 is connected with the gas-collecting hood 1 through a plurality of groups of limiting clamping grooves 13 and limiting clamping columns 31, and each group of limiting clamping grooves 13 and limiting clamping columns 31 are matched with each other. The limiting clamping column 31 is specifically arranged on the periphery of the connecting sleeve 3 and extends along the radial direction of the connecting sleeve 3. The limiting clamping groove 13 is specifically an L-shaped clamping groove arranged at the bottom end of the gas collecting hood 1, the L-shaped clamping groove comprises an axial groove and a circumferential groove which are vertically communicated, the axial groove extends along the axial direction of the gas collecting hood 1, and the circumferential groove extends along the circumferential direction of the gas collecting hood 1. During assembly, the axial groove of the gas collecting hood 1 is aligned with the limiting clamping column 31, the gas collecting hood 1 is pressed down along the axial direction to enable the limiting clamping column 31 to enter the axial groove, and finally the gas collecting hood 1 is rotated relative to the connecting sleeve 3 to enable the limiting clamping column 31 to enter the circumferential groove, so that the connecting sleeve 3 is fixedly connected with the gas collecting hood 1 in a clamping manner. Specifically, three groups of limit clamping grooves 13 and limit clamping columns 31 which are uniformly distributed are arranged between the connecting sleeve 3 and the gas collecting channel 1.

Of course, change the connected mode between adapter sleeve 3 and the gas collecting channel 1, for example the integral type sets up adapter sleeve 3 and gas collecting channel 1, does not influence the realization the utility model discloses an aim.

What needs to be supplemented is that the arrangement of the connecting sleeve 3 occupies the space of the gas collecting cavity 11 to a certain extent, and on the basis, the length of the connecting sleeve 3 is not suitable to be too long, and is specifically adjusted according to the implementation situation.

When in use, the gas collecting hood 1 is arranged in the water tank, so that liquid can conveniently enter the gas collecting cavity 11 from the liquid inlet hole 12. In order to protect the pressure detection element 4 from the liquid, the pressure detection element 4 is arranged outside the water tank, so that the gas-conducting sleeve 2 passes through the mounting plate 01 of the water tank until it is inserted into the gas-collecting chamber 11.

What need supply is, the top of gas collecting cavity 11 is equipped with limiting plate 14, and limiting plate 14 extends along the axial of gas collecting cavity 11, can offset with the first end of air guide sleeve 2 to cooperation mounting panel 01 is injectd air guide sleeve 2 and is radially swung or the slope in gas collecting cavity 11, reduces the risk that liquid got into air guide sleeve 2, and the reliability is higher.

The mounting panel 01 is equipped with the mounting hole, correspondingly, the utility model discloses still include first sealing member 5, first sealing member 5 overlaps admittedly on air guide sleeve 2, and the terminal surface of first sealing member 5 offsets along the hole of mounting hole, prevents that liquid from leaking from the mounting hole. The first seal 5 is preferably an annular rubber seal, but is not limited thereto.

The first end of air guide sleeve 2 sets firmly the backstop plate 22 that offsets with the mounting hole, and the up end of backstop plate 22 offsets through the hole edge of first sealing member 5 and mounting hole, and backstop plate 22 can prevent that the first end of air guide sleeve 2 from boring into gas collection chamber 11, guarantees that pressure measurement spare 4 locates outside the water tank reliably. In this embodiment, the stop plate 22 and the mounting hole are both cylindrical, and the outer diameter of the stop plate 22 is larger than the inner diameter of the mounting hole.

The stop plate 22 is provided with an avoidance hole 23 for the pressure detection piece 4 to pass through, so that the pressure detection piece 4 can conveniently detect the compressed air in the center of the air guide sleeve 2. The relief hole 23 is preferably a circular through hole provided at the center of the stopper plate 22.

In this embodiment, the pressure detecting element 4 includes a detecting circuit board and a guiding sleeve 41, the detecting circuit board is used for converting the collected air pressure signal into an electrical signal, and includes a chip and various electronic components, which can refer to the prior art. Guide sleeve 41 links to each other with the detection circuit board integral type, and the center cavity of guide sleeve 41, guide sleeve 41 pass dodge hole 23, and guide sleeve 41 is used for guiding the compressed air in the air guide sleeve 2 to the detection circuit board, effectively prevents that compressed air from leaking or pressure reduction, is favorable to promoting the detection precision.

Specifically, the guide sleeve 41 is also cylindrical, and the aperture of the guide sleeve 41 is smaller than that of the air guide sleeve 2, so that the guide sleeve 41 can further compress air, and the detection sensitivity of the pressure detection piece 4 is improved.

For preventing that air guide sleeve 2 interior compressed air from dodging hole 23 and leaking, the utility model discloses still including solid cover in guide sleeve 41 and with dodge hole 23's hole along balanced second sealing member 6, effectively prevent air guide sleeve 2's compressed air from leaking, and then prevent air guide sleeve 2's compressed air's atmospheric pressure and reduce, effectively promote testing result's accuracy. The second seal 6 is preferably an O-ring rubber seal, but is not limited thereto.

In this particular embodiment, the stopper plate 22 has a receiving groove with an opening facing downward. The opening part of holding tank sets firmly bottom cover plate 7, and backstop plate 22 and bottom cover plate 7 accessible threaded connection's mode realize linking firmly. The holding tank encloses into confined chamber 21 that holds with end cover plate 7, conveniently holds chamber 21 and holds pressure measurement spare 4. The split structure of the bottom cover plate 7 and the stop plate 22 facilitates the installation of the pressure detection member 4.

In order to make pressure measurement spare 4 be fixed in and hold chamber 21, end cover plate 7 sets firmly butt arch 71, and butt arch 71 offsets with pressure measurement spare 4, prevents that pressure measurement spare 4 from rocking along the axial of air guide sleeve 2. The abutting protrusion 71 is provided at the center of the bottom cover plate 7, and may be an elastic abutting protrusion adhered to the center of the bottom cover plate 7 by adhesive, which is not particularly limited herein.

In order to prevent the liquid in the gas collecting cavity 11 from entering the gas guide sleeve 2, the second end of the gas guide sleeve 2 is provided with a waterproof and breathable film 8.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A liquid level sensor, comprising:

the gas collecting hood (1) is provided with a gas collecting cavity (11), the gas collecting hood (1) is provided with a liquid inlet hole (12), and liquid flowing in from the liquid inlet hole (12) is used for compressing air in the gas collecting cavity (11) to the top of the gas collecting cavity (11) from bottom to top;

the first end sets firmly closed holding chamber (21) and the second end set firmly in air guide sleeve (2) in gas collection chamber (11), hold chamber (21) internal fixation and have pressure measurement spare (4), air guide sleeve (2) are used for with the compressed air top-down of gas collection chamber (11) top guides to pressure measurement spare (4) are in order to realize the detection.

2. The liquid level sensor according to claim 1, further comprising a connecting sleeve (3) fixedly arranged between the gas guide sleeve (2) and the gas collecting channel (1).

3. The liquid level sensor according to claim 2, wherein the connecting sleeve (3) is in threaded connection with the gas guide sleeve (2), and the connecting sleeve (3) is connected with the gas collecting hood (1) through a plurality of groups of mutually matched limiting clamping grooves (13) and limiting clamping columns (31).

4. A liquid level sensor according to any one of claims 1 to 3, characterized in that the gas-collecting channel (1) is intended to be arranged in a water tank, and the gas-guiding sleeve (2) is intended to pass through a mounting plate (01) of the water tank until it abuts against a limiting plate (14) in the gas-collecting chamber (11).

5. The liquid level sensor according to claim 4, wherein the mounting plate (01) is provided with a mounting hole, and further comprises a first sealing member (5) sleeved on the air guide sleeve (2) and abutting against the hole edge of the mounting hole to seal the mounting hole.

6. The liquid level sensor according to claim 5, wherein a stop plate (22) abutting against the mounting hole is fixedly arranged at the first end of the air guide sleeve (2), an avoidance hole (23) is formed in the stop plate (22), and the pressure detection piece (4) comprises a detection circuit board and a guide sleeve (41) penetrating through the avoidance hole (23) to guide compressed air in the air guide sleeve (2) to the detection circuit board.

7. The liquid level sensor according to claim 6, further comprising a second sealing member (6) fixedly sleeved on the guide sleeve (41) and abutting against the hole edge of the avoiding hole (23) to seal the avoiding hole (23).

8. The fill level sensor according to claim 6, characterized in that the stop plate (22) has a receiving groove, a bottom cover plate (7) is fixed to the opening of the receiving groove, and the stop plate (22) and the bottom cover plate (7) enclose the receiving cavity (21).

9. The level sensor according to claim 8, characterized in that the bottom cover plate (7) is fixedly provided with an abutment projection (71) which abuts against the pressure detection member (4).

10. A liquid level sensor according to any one of claims 1 to 3, characterized in that the second end of the air-guiding sleeve (2) is provided with a waterproof, air-permeable membrane (8).

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