CN213874552U

CN213874552U - Liquid level sensor

Info

Publication number: CN213874552U
Application number: CN202022989213.5U
Authority: CN
Inventors: 柳州
Original assignee: Foshan Wanma Electronic Technology Co ltd
Current assignee: Foshan Wanma Electronic Technology Co ltd
Priority date: 2020-12-10
Filing date: 2020-12-10
Publication date: 2021-08-03
Anticipated expiration: 2030-12-10

Abstract

The utility model discloses a liquid level sensor, which comprises a detection mechanism, wherein the detection mechanism comprises a detection shell and a detection group, and the detection group is arranged in the detection shell; the detection group comprises a transmitting tube and a receiving tube, the transmitting direction of the transmitting tube and the receiving direction of the receiving tube are in the same horizontal plane, the intersection point of the transmitting direction of the transmitting tube and the receiving direction of the receiving tube is located on the front outer wall of the detection shell, and the front outer wall of the detection shell is a plane. The light emitted by the emitting tube of the same group detection group in the liquid level sensor can be received by the receiving tube only through once total reflection, so that the misjudgment probability is greatly reduced, and the accuracy is improved. In addition, the outer wall of the front part of the detection shell is a plane, so that sundries cannot be hung on the front part of the detection shell, and daily cleaning is facilitated.

Description

Liquid level sensor

Technical Field

The utility model relates to a liquid level detection device technical field specifically, relates to a liquid level sensor.

Background

A liquid level sensor is a sensor for detecting a liquid level, which is widely used in various fields. The liquid level sensor is generally a photoelectric detection method, and referring to fig. 1, the liquid level sensor comprises a shell 01, an emitting piece 02 and a receiving piece 03, wherein the emitting piece 02 and the receiving piece 03 are arranged in the shell 01 side by side, and the emitting direction of the emitting piece 02 is parallel to the receiving direction of the receiving piece 03 and is on the same horizontal plane, and the horizontal plane forms a detection plane. When the liquid level does not reach the detection surface, the light emitted by the emitting part 02 can be received by the receiving part 03 after twice total reflection at the bulge 011 of the shell 01; when the liquid surface reaches the detection surface, the light emitted from the emitting element 02 is not reflected at the projection 011 but is directly injected into the liquid, and thus the receiving element 03 does not receive the light.

However, because the light emitted by the emitting piece 02 can be received by the receiving piece 03 after being totally reflected twice, when water mist or water vapor exists in the container, the light emitted by the emitting piece 02 is easily and directly emitted into the water mist or the water vapor, and the receiving piece 03 cannot receive the light, so that an erroneous detection signal is emitted, and misjudgment is caused.

SUMMERY OF THE UTILITY MODEL

To the not enough of prior art, the utility model provides a level sensor.

The utility model discloses a liquid level sensor, which comprises a detection mechanism, wherein the detection mechanism comprises a detection shell and a detection group, and the detection group is arranged in the detection shell;

the detection group comprises a transmitting tube and a receiving tube, the transmitting direction of the transmitting tube and the receiving direction of the receiving tube are in the same horizontal plane, the intersection point of the transmitting direction of the transmitting tube and the receiving direction of the receiving tube is located on the front outer wall of the detection shell, and the front outer wall of the detection shell is a plane.

According to the utility model discloses an embodiment, form first contained angle between the transmission direction of transmitting tube and the anterior outer wall of surveying the shell, form the second contained angle between the receiving direction of receiving tube and the anterior outer wall of surveying the shell, the angle of first contained angle is the same with the angle of second contained angle.

According to the utility model discloses an embodiment, the anterior inner wall of surveying the shell sets up the convex part, and the convex part has first opposite face and second opposite face, and first opposite face is perpendicular with the transmission direction of launching tube, and the second opposite face is perpendicular with the transmission direction of receiving tube.

According to the utility model discloses an embodiment, the quantity of surveying group is the multiunit, and the multiunit surveys the group along vertical direction parallel arrangement.

According to the utility model discloses an embodiment, first mounting panel is located to a plurality of transmitting tubes, and the second mounting panel is located to a plurality of receiver tubes.

According to an embodiment of the utility model, still set up the epoxy layer in surveying the shell.

According to the utility model discloses an embodiment, detection mechanism still includes the circuit board, circuit board and transmitting tube and receiver tube electric connection.

According to one embodiment of the present invention, a limit step is provided in the probing case, and the circuit board is provided on the limit step; the inner wall of the detection shell is provided with a positioning part which is inserted into the mounting hole of the circuit board.

According to the utility model discloses an implementation still includes installation mechanism, and installation mechanism includes installation shell, first magnetism spare and second magnetism spare, and in the installation shell was located to first magnetism spare, in the detection shell was located to the second magnetism spare, first magnetism spare and second magnetism spare magnetism attracted mutually.

Compared with the prior art, the utility model discloses a level sensor has following advantage:

the utility model discloses a level sensor, the light of the launching tube transmission of the same group only need just can be received by the receiver tube through once total reflection, and the probability of greatly reduced erroneous judgement promotes the degree of accuracy. Additionally, the utility model discloses a survey the anterior outer wall of shell and be the plane, debris can not hang on surveying the anterior of shell, the daily cleanness of also being convenient for.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 is a schematic diagram of a prior art liquid level sensor;

FIG. 2 is a schematic structural view of a liquid level sensor in the embodiment;

FIG. 3 is an internal structural view of a probe housing in an embodiment;

FIG. 4 is a diagram showing a positional relationship of the probe groups in the embodiment;

FIG. 5 is a sectional view showing the structure of a liquid level sensor in the embodiment;

FIG. 6 is a sectional view showing another structure of the liquid level sensor in the embodiment.

Description of reference numerals:

01. a housing; 011. a protrusion; 02. a launch member; 03. a receiver;

1. a detection mechanism; 11. a probe housing; 111. a convex portion; 112. a first opposing face; 113. a second opposing face; 114. a limiting step; 115. a positioning part; 12. a detection group; 121. a launch tube; 122. a receiving tube; 123. a first mounting plate; 124. a second mounting plate; 13. a circuit board; 131. mounting holes; 14. a first included angle; 15. a second included angle; 2. an installation mechanism; 21. installing a shell; 22. a first magnetic member; 23. a second magnetic member; 3. a wall of the container.

Detailed Description

In the following description, numerous implementation details are set forth in order to provide a more thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the invention. That is, in some embodiments of the invention, details of these implementations are not necessary. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for description purposes, not specifically referring to the order or sequence, and are not intended to limit the present invention, but only to distinguish the components or operations described in the same technical terms, and are not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 2-6, a liquid level sensor comprises a sensing means 1 for sensing the liquid level in a container and a mounting means 2 for mounting on a container wall 3.

Referring to fig. 2-6, the detecting mechanism 1 includes a detecting housing 11, a detecting group 12 and a circuit board 13, wherein the detecting group 12 and the circuit board 13 are installed in the detecting housing 11. The number of the detection groups 12 is multiple, and the multiple detection groups 12 are arranged in the detection housing 11 in parallel along the vertical direction. Thus, the plurality of detection sets 12 form a plurality of detection surfaces corresponding to a plurality of liquid levels, and the plurality of liquid levels of the container can be monitored. The present embodiment is described with respect to two sets of detection groups 12, wherein one set of detection groups 12 is used for detecting the upper level of the container, and the other set of detection groups 12 is used for detecting the lower level of the container.

The front outer wall of the detection housing 11 is a plane, and the front inner wall of the detection housing 11 is provided with a convex portion 111. Wherein the convex portion 111 has a triangular prism shape and has a first opposing surface 112 and a second opposing surface 113. In addition, a limit step 114 is arranged in the detection shell 11 and used for limiting and mounting the circuit board 13; the front inner wall of the detection housing 11 is provided with a positioning portion 115 for positioning and mounting the circuit board 13. In addition, an epoxy layer is disposed in the probe housing 11, which plays a role of sealing and waterproofing.

The single group of detection sets 12 includes a transmitting tube 121 and a receiving tube 122; the transmitting tubes 121 of the two detection sets 12 are both mounted on a first mounting plate 123, and the receiving tubes 122 are both mounted on a second mounting plate 124.

Further, the transmitting tube 121 and the receiving tube 122 of the single group of detection groups 12 are symmetrically arranged, and the transmitting direction of the transmitting tube 121 and the receiving direction of the receiving tube 122 are in the same horizontal plane. The transmitting tube 121 is disposed opposite to the first opposing surface 112, and the receiving tube 122 is disposed opposite to the second opposing surface 113 such that the first opposing surface 112 is perpendicular to the transmitting direction of the transmitting tube 121, and the second opposing surface 113 is perpendicular to the transmitting direction of the receiving tube 122.

Still further, the intersection point of the transmitting direction of the transmitting tube 121 and the receiving direction of the receiving tube 122 is located at the front outer wall of the detecting housing 11. A first included angle 14 is formed between the transmitting direction of the transmitting tube 121 and the front outer wall of the detecting shell 11, a second included angle 15 is formed between the receiving direction of the receiving tube 122 and the front outer wall of the detecting shell 11, and the angle of the first included angle 14 is the same as that of the second included angle 15, so that the transmitting light of the transmitting tube 121 can be received by the receiving tube 122 after being reflected by the front outer wall of the detecting shell 11.

The circuit board 13 is arranged in the detection shell 11 and is arranged on the limit step 114, and the mounting hole 131 of the circuit board 13 is inserted with the positioning part 115; the circuit board 13 is electrically connected to the transmitting tube 121 and the receiving tube 122.

Referring to fig. 2, 5 and 6, the mounting mechanism 2 includes a mounting housing 21, a first magnetic member 22 and a second magnetic member 23, the first magnetic member 22 is mounted in the mounting housing 21, the second magnetic member 23 is mounted in the detecting housing 11, and the first magnetic member 22 and the second magnetic member 23 are magnetically attracted to each other. In the present embodiment, magnets are used for the first magnetic member 22 and the second magnetic member 23. When the magnetic detector is installed, the detection shell 11 and other components are installed on the container wall 3 under the action of the magnetic attraction between the first magnetic part 22 and the second magnetic part 23.

In the specific application: when the liquid level is lower than the lower limit liquid level, the light emitted by the emitting tubes 121 of the detection group 12 for detecting the lower limit liquid level is received by the corresponding receiving tubes 122 after the front outer wall of the shell 11 is detected, the light emitted by the emitting tubes 121 of the detection group 12 for detecting the upper limit liquid level is received by the corresponding receiving tubes 122 after the front outer wall of the shell 11 is detected, and the water pump is started and pumps water into the container;

when the liquid level reaches the lower limit liquid level but does not reach the upper limit liquid level, the light emitted by the emitting tube 121 of the detection group 12 for detecting the lower limit liquid level is emitted into the liquid, the light emitted by the emitting tube 121 of the detection group 12 for detecting the upper limit liquid level is received by the corresponding receiving tube 122 after the outer wall of the front part of the detection shell 11, and the water pump continues to pump water into the container;

when the liquid level reaches the upper limit liquid level, the light emitted by the emitting tube 121 of the detection group 12 for detecting the lower limit liquid level is emitted into the liquid, the light emitted by the emitting tube 121 of the detection group 12 for detecting the upper limit liquid level is emitted into the liquid, and the water pump stops pumping water into the container.

In summary, the light emitted by the emitting tube of the same group of detection groups in the liquid level sensor can be received by the receiving tube only through once total reflection, so that the misjudgment probability is greatly reduced, and the accuracy is improved. In addition, the outer wall of the front part of the detection shell is a plane, so that sundries cannot be hung on the front part of the detection shell, and daily cleaning is facilitated.

The above description is only an embodiment of the present invention, and is not intended to limit the present invention. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The liquid level sensor is characterized by comprising a detection mechanism, wherein the detection mechanism comprises a detection shell and a detection group, and the detection group is arranged in the detection shell;

the detection group comprises a transmitting tube and a receiving tube, the transmitting direction of the transmitting tube and the receiving direction of the receiving tube are in the same horizontal plane, the intersection point of the transmitting direction of the transmitting tube and the receiving direction of the receiving tube is located on the outer wall of the front portion of the detection shell, and the outer wall of the front portion of the detection shell is a plane.

2. The liquid level sensor of claim 1, wherein a first included angle is formed between the transmitting direction of the transmitting tube and the front outer wall of the detecting shell, a second included angle is formed between the receiving direction of the receiving tube and the front outer wall of the detecting shell, and the first included angle and the second included angle are the same.

3. The fluid level sensor of claim 2, wherein the front interior wall of the probe housing is provided with a protrusion having a first opposing surface perpendicular to the direction of emission of the emitter tube and a second opposing surface perpendicular to the direction of emission of the receiver tube.

4. The fluid level sensor of claim 1, wherein the number of detection sets is a plurality of sets, the plurality of sets being arranged in parallel in a vertical direction.

5. The fluid level sensor of claim 4, wherein a plurality of the emitter tubes are disposed on a first mounting plate and a plurality of the receiver tubes are disposed on a second mounting plate.

6. The fluid level sensor of claim 1, wherein an epoxy layer is further disposed within the detection housing.

7. The fluid level sensor of claim 1, wherein the detection mechanism further comprises a circuit board electrically connected to the emitter tube and the receiver tube.

8. The liquid level sensor of claim 7, wherein a limit step is provided in the detection housing, and the circuit board is provided on the limit step; the inner wall of the detection shell is provided with a positioning part, and the positioning part is inserted into the mounting hole of the circuit board.

9. The fluid level sensor of claim 1, further comprising a mounting mechanism, the mounting mechanism comprising a mounting housing, a first magnetic member and a second magnetic member, the first magnetic member disposed within the mounting housing, the second magnetic member disposed within the detection housing, the first magnetic member magnetically attracted to the second magnetic member.