CN217877893U

CN217877893U - Liquid level sensor

Info

Publication number: CN217877893U
Application number: CN202221362681.2U
Authority: CN
Inventors: 李卫民; 徐林波; 段文强; 冉林
Original assignee: Tengsuo Auto Parts Huangshi Co ltd
Current assignee: Tengsuo Auto Parts Huangshi Co ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-11-22
Anticipated expiration: 2032-05-31

Abstract

The utility model discloses a liquid level sensor relates to liquid level detection technical field, include: circuit board, foil gage and breather pipe, the circuit board is equipped with accepts the chamber, the foil gage is located accept the intracavity and with circuit board electrical connection, the foil gage will it separates for last cavity and lower cavity to accept the chamber, lower cavity is used for the bottom liquid intercommunication with the liquid container that awaits measuring, breather pipe one end with go up cavity intercommunication, the other end and external atmosphere intercommunication. The utility model discloses can be except that external atmospheric pressure to level measurement's interference, only consider that liquid is right the pressure effect of foil gage downside can be converted according to Archimedes' principle and obtain the liquid level height, and the liquid level measurement precision obtains improving.

Description

Liquid level sensor

Technical Field

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

Background

The liquid level sensor is based on the principle that the measured static pressure of liquid is proportional to the height of the liquid, the static pressure of the liquid is converted into an electric signal, the electric signal is converted into a standard electric signal through temperature compensation and linear correction, and finally the actual height value of the liquid is calculated.

At present, most of liquid level sensors on the market adopt absolute pressure type chips (namely, a standard atmospheric pressure is sealed in the chip in advance), but the atmospheric pressure in each area is different, so the measurement accuracy of the general absolute pressure type liquid level sensor can only measure the liquid level of more than 1m, and the measurement accuracy of the liquid level of less than 1m is not high.

SUMMERY OF THE UTILITY MODEL

An embodiment of the utility model provides a level sensor to solve the not high technical problem of current level sensor measurement accuracy among the prior art.

An embodiment of the utility model provides a liquid level sensor, include:

the circuit board is provided with an accommodating cavity;

the strain gauge is arranged in the accommodating cavity and electrically connected with the circuit board, the accommodating cavity is divided into an upper cavity and a lower cavity by the strain gauge, and the lower cavity is used for being communicated with the bottom liquid of the liquid container to be tested;

and one end of the vent pipe is communicated with the upper cavity, and the other end of the vent pipe is communicated with the outside atmosphere.

In some embodiments, the liquid level sensor further comprises:

the lower shell is arranged below the circuit board and connected with the circuit board, a lower through hole is formed in the lower shell, and the lower through hole is communicated with the lower cavity.

In some embodiments, the liquid level sensor further comprises:

the upper shell is arranged above the circuit board and connected with the lower shell to wrap the circuit board, a shell connector is arranged on the upper shell and connected with the vent pipe, an upper through hole is formed in the shell connector, and the upper through hole is communicated with the upper shell.

In some embodiments, a first sealing ring is arranged at the joint of the upper shell and the lower shell.

In some embodiments, a second sealing ring is disposed at a communication position of the lower through hole and the lower cavity.

In some embodiments, the liquid level sensor further comprises:

the waterproof breathable connector is connected with one end, far away from the upper cavity, of the vent pipe.

In some embodiments, the waterproof, breathable joint comprises:

the joint body is internally provided with an air vent, one end of the joint body is connected with the air pipe, and the air vent is communicated with the air pipe;

the waterproof breathable film is fixedly connected with the joint body and is attached to one end of the vent pipe.

In some embodiments, a third sealing ring is arranged at the joint of the waterproof breathable film and the joint body.

In some embodiments, the waterproof, breathable joint further comprises:

and the installation cover is connected with the joint body to fix the waterproof breathable film.

In some embodiments, the vent tube is a plastic vent tube.

The utility model provides a beneficial effect that technical scheme brought includes:

an embodiment of the utility model provides a liquid level sensor, it is equipped with circuit board, foil gage and breather pipe, the circuit board is equipped with accepts the chamber, the foil gage is located accept the intracavity and incite somebody to action it separates for last cavity and lower cavity to accept the chamber, cavity and the liquid container's that awaits measuring bottom liquid intercommunication down, breather pipe one end with go up cavity intercommunication, the other end and external atmosphere intercommunication, be equivalent to foil gage upside and downside all receive external atmospheric pressure effect, eliminate external atmospheric pressure and to level measurement's interference, only consider liquid right the pressure effect of foil gage downside can be converted according to Archimedes principle and obtain the liquid level height, and the level measurement precision obtains improving.

Drawings

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

Fig. 1 is a cross-sectional view of a liquid level sensor according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a liquid level sensor according to an embodiment of the present invention;

fig. 3 is a sectional view of a waterproof and air-permeable joint provided by an embodiment of the present invention;

in the figure: 1. a circuit board; 11. an accommodating cavity; 111. an upper cavity; 112. a lower cavity; 2. a strain gauge; 3. a breather pipe; 4. a lower housing; 41. a lower through hole; 5. an upper housing; 51. a housing joint; 511. an upper through hole; 52. an electrical connector; 6. a waterproof breathable joint; 61. a connector body; 611. a vent hole; 62. a waterproof breathable film; 63. installing a cover; 7. a first seal ring; 8. a second seal ring; 9. and a third sealing ring.

Detailed Description

To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and obviously, the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

An embodiment of the utility model provides a level sensor, it can solve the not high technical problem of current level sensor measurement accuracy.

Referring to fig. 1 and 2, an embodiment of the present invention provides a liquid level sensor, including: circuit board 1, foil gage 2 and breather pipe 3.

The circuit board 1 is provided with an accommodating cavity 11, the strain gauge 2 is arranged in the accommodating cavity 11 and electrically connected with the circuit board 1, the accommodating cavity 11 is divided into an upper cavity 111 and a lower cavity 112 by the strain gauge 2, and the lower cavity 112 is used for being communicated with bottom liquid of a liquid container to be measured. One end of the vent pipe 3 is communicated with the upper cavity 111, and the other end is communicated with the outside atmosphere.

The embodiment of the utility model provides a liquid level sensor, it is equipped with circuit board 1, foil gage 2 and breather pipe 3, circuit board 1 is equipped with accepts chamber 11, foil gage 2 is located accept in the chamber 11 and will accept chamber 11 and separate for last cavity 111 and lower cavity 112, cavity 112 and the liquid container's that awaits measuring bottom liquid intercommunication down, breather pipe 3 one end with go up cavity 111 intercommunication, the other end and external atmosphere intercommunication, be equivalent to 2 upsides of foil gage and downside all receive external atmospheric pressure effect, eliminate external atmospheric pressure and to level measurement's interference, only consider that liquid is right the pressure effect of 2 upsides of foil gage can be converted according to Archimedes's principle and obtain the liquid level height, and the level measurement precision obtains improving.

As an optional implementation manner, in an embodiment of the present invention, referring to fig. 1, the liquid level sensor further includes a lower housing 4, the lower housing 4 is disposed below the circuit board 1 and connected to the circuit board 1, a lower through hole 41 is disposed on the lower housing 4, the lower through hole 41 is communicated with the lower cavity 112, which is equivalent to that the lower through hole 41 connects the lower side of the strain gauge 2 with the bottom liquid of the liquid container to be measured, and the structure is simple.

As an optional implementation manner, in an embodiment of the present invention, referring to fig. 1, the liquid level sensor further includes an upper housing 5, the upper housing 5 is disposed above the circuit board 1 and connected to the lower housing 4 to wrap the circuit board 1, a housing joint 51 is disposed on the upper housing 5, the housing joint 51 is connected to the vent pipe 3, the housing joint 51 is provided with an upper through hole 511, the upper through hole 511 is communicated with the upper cavity 111, which is equivalent to the upper through hole 511 communicating the upper side of the strain gauge 2 with the external atmospheric pressure, and the structure is simple. The upper housing 5 is also provided with an electrical connector 52.

As an optional implementation manner, in an embodiment of the present invention, referring to fig. 1, a first sealing ring 7 is disposed at a joint of the upper casing 5 and the lower casing 4, and the first sealing ring 7 prevents a liquid to be measured from entering a space formed between the upper casing 5 and the lower casing 4, so as to protect the circuit board 1.

As an alternative embodiment, in an embodiment of the present invention, referring to fig. 1, a second sealing ring 8 is disposed at a communication portion between the lower through hole 41 and the lower cavity 112, and the second sealing ring 8 prevents the liquid to be measured from entering the space formed between the upper shell 5 and the lower shell 4, so as to protect the circuit board 1.

As an optional implementation manner, in an embodiment of the present invention, referring to fig. 2, the liquid level sensor further includes a waterproof air-permeable joint 6, the waterproof air-permeable joint 6 is connected to an end of the vent pipe 3 away from the upper cavity 111, on one hand, it is ensured that the upper side of the strain gauge 2 communicates with the external atmospheric pressure, and on the other hand, it is ensured that external moisture cannot enter, so as to protect the strain gauge 2.

Further, as shown in fig. 3, the waterproof and breathable joint 6 comprises: a joint body 61 and a waterproof and breathable film 62. The connector body 61 is internally provided with a vent hole 611, one end of the connector body 61 is connected with the vent pipe 3, the vent hole 611 is communicated with the vent pipe 3, and the waterproof breathable film 62 is fixedly connected with one end of the connector body 61, which is far away from the vent pipe 3, and is attached to the vent hole 611.

As an alternative embodiment, referring to fig. 3, in an embodiment of the present invention, a third sealing ring 9 is disposed at a joint of the waterproof and breathable membrane 62 and the joint body 61, and the third sealing ring 9 prevents moisture from entering the vent hole 611.

As an optional embodiment, in an embodiment of the present invention, referring to fig. 3, the waterproof and breathable joint 6 further includes a mounting cover 63, and the mounting cover 63 is connected to the joint body 61 to fix the waterproof and breathable membrane 62, so that the structure is simple and the installation and the detachment are convenient.

As an optional implementation manner, in an embodiment of the present invention, the ventilation pipe 3 is a plastic ventilation pipe, so that the cost is low and the assembly and disassembly are convenient.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

It is noted that, in the present invention, relational terms such as "first" and "second", and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.

The above description is only exemplary of the invention, and is intended to enable those skilled in the art to understand and implement the 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

1. A liquid level sensor, comprising:

the circuit board (1), the said circuit board (1) holds the cavity (11);

the strain gauge (2) is arranged in the accommodating cavity (11) and is electrically connected with the circuit board (1), the accommodating cavity (11) is divided into an upper cavity (111) and a lower cavity (112) by the strain gauge (2), and the lower cavity (112) is used for being in liquid communication with the bottom of a liquid container to be measured;

one end of the vent pipe (3) is communicated with the upper cavity (111), and the other end of the vent pipe (3) is communicated with the outside atmosphere.

2. The fluid level sensor of claim 1, further comprising:

the lower shell (4), the lower shell (4) is arranged below the circuit board (1) and connected with the circuit board (1), a lower through hole (41) is formed in the lower shell (4), and the lower through hole (41) is communicated with the lower cavity (112).

3. The fluid level sensor of claim 2, further comprising:

go up casing (5), go up casing (5) and locate circuit board (1) top and with casing (4) are connected in order to wrap up circuit board (1) down, it connects (51) to be equipped with casing on casing (5) to go up, casing connect (51) with breather pipe (3) are connected, casing connect (51) are equipped with through-hole (511), go up through-hole (511) with go up cavity (111) intercommunication.

4. A fluid level sensor as defined in claim 3, wherein: and a first sealing ring (7) is arranged at the joint of the upper shell (5) and the lower shell (4).

5. The fluid level sensor of claim 2, wherein: and a second sealing ring (8) is arranged at the communication part of the lower through hole (41) and the lower cavity (112).

6. The fluid level sensor of claim 1, further comprising:

waterproof ventilative connects (6), waterproof ventilative connects (6) with breather pipe (3) is kept away from the one end of going up cavity (111) is connected.

7. The level sensor according to claim 6, characterized in that said waterproof and breathable joint (6) comprises:

the joint body (61), a vent hole (611) is arranged in the joint body (61), one end of the joint body (61) is connected with the vent pipe (3), and the vent hole (611) is communicated with the vent pipe (3);

waterproof ventilated membrane (62), waterproof ventilated membrane (62) with connect body (61) to keep away from breather pipe (3) one end fixed connection and laminating air vent (611).

8. The fluid level sensor of claim 7, wherein:

and a third sealing ring (9) is arranged at the joint of the waterproof breathable film (62) and the joint body (61).

9. The level sensor according to claim 7, characterized in that said waterproof and breathable joint (6) further comprises:

an installation cover (63), the installation cover (63) being connected with the joint body (61) to fix the waterproof breathable film (62).

10. The fluid level sensor of claim 1, wherein: the vent pipe (3) is a plastic vent pipe.