Liquid level detection sensor

Abstract

The utility model provides a liquid level detection sensor. The liquid level detection sensor comprises a strip-shaped substrate; the at least one group of detection modules are arranged on the strip-shaped substrate; the detection module comprises a light emitter and a light receiver; the light emitter and the light receiver are distributed along the axial direction of the strip-shaped substrate; the guide pipe is arranged outside the strip-shaped substrate in a sleeving mode, the guide pipe is provided with a reflecting surface, and the reflecting surface, the light emitter and the light receiver are located on the same light path. The structural layout mode in the prior art is abandoned, the light emitter and the light receiver which are distributed in the axial direction of the strip-shaped substrate are innovatively arranged on the strip-shaped substrate, space distribution of a vertical space is reasonably utilized, light is reflected through the reflecting face on the guide pipe, and the light emitting efficiency is improved. Therefore, the light emitter and the light receiver can be closer to the wall of the guide pipe, and the whole liquid level detection sensor can be narrower and thinner, so that the liquid level detection sensor is suitable for a narrow container.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and particularly relates to a liquid level detection sensor. Background Art

[0002] The liquid level detection sensor is mainly used to detect the liquid level height in a container. In the prior art, generally, the combined action of a light emitter and a light receiver is adopted, and the liquid level height is detected by the light receiving condition of the light receiver; the above-mentioned light emitter and light receiver are arranged on the same horizontal plane, so that the liquid level detection sensor occupies a large space in the horizontal direction (reference can be made to the patent of the liquid level sensor and liquid level control device CN219573203U publicly disclosed by the applicant in the past). However, for some containers with a relatively narrow and long detection space, the above-mentioned liquid level detection sensor cannot be placed into the container due to size problems, resulting in inapplicability. Summary of the Utility Model

[0003] In order to overcome the above technical defects, the utility model provides a liquid level detection sensor, which can solve the technical problem that the liquid level detection sensor in the prior art occupies too much horizontal space and is not applicable to some containers.

[0004] The utility model is realized according to the following technical scheme:

[0005] The utility model provides a liquid level detection sensor, which comprises:

[0006] A strip-shaped substrate;

[0007] At least one group of detection modules, which are arranged on the strip-shaped substrate; the detection module comprises a light emitter and a light receiver; the light emitter and the light receiver are arranged along the axial direction of the strip-shaped substrate;

[0008] A conduit, which is sleeved outside the strip-shaped substrate, and the conduit is provided with a reflecting surface, and the reflecting surface, the light emitter and the light receiver are on the same optical path.

[0009] This application abandons the structural layout mode of the prior art, innovatively arranges the light emitter and the light receiver along the axial direction of the strip-shaped substrate on the strip-shaped substrate, reasonably utilizes the spatial distribution of the vertical space, and uses the reflecting surface on the conduit to reflect light, so that the light emitter and the light receiver can be closer to the conduit wall, making the whole liquid level detection sensor narrower and thinner, and thus applicable to narrow containers.

[0010] In one embodiment, the detection module further comprises a light blocking member, and the light blocking member is arranged between the light emitter and the light receiver.

[0011] In one embodiment, an angle is provided between the optical transmitter and the receiver, and the angle range is 30° to 180°.

[0012] In one embodiment, the liquid level detection sensor further includes a shielding plate, and the shielding plate and the strip-shaped substrate are respectively located on opposite sides of the detection module.

[0013] In one embodiment, the shielding plate is arranged parallel to the strip-shaped substrate.

[0014] In one embodiment, a circuit is etched on the strip-shaped substrate, and the circuit is electrically connected to the detection module.

[0015] In one embodiment, the liquid level detection sensor further includes an indicator light, the indicator light is arranged on the strip-shaped substrate, and the indicator light is electrically connected to the detection module and is used to light up according to the detection situation of the detection module.

[0016] In one embodiment, the indicator light and the detection module are arranged on the same side of the strip-shaped substrate.

[0017] In one embodiment, a transparent medium is encapsulated between the conduit, the strip-shaped substrate, and the detection module.

[0018] In one embodiment, blocking members are provided at both ends of the conduit, and a wire passing hole for wires to pass through is provided on one of the blocking members. Description of the Drawings

[0019] The following further describes in detail the specific embodiments of the present invention with reference to the drawings, where:

[0020] Figure 1 is the front view of the liquid level detection sensor of the present invention;

[0021] Figure 2 is the cross-sectional view of the liquid level detection sensor of the present invention;

[0022] Figure 3 is the three-dimensional view (omitting the conduit) of the liquid level detection sensor of the present invention;

[0023] Figure 4 is the schematic diagram of the working principle of the liquid level detection sensor of the present invention (without water);

[0024] Figure 5 is the schematic diagram of the working principle of the liquid level detection sensor of the present invention (with water).

[0025] Description of the Reference Numerals:

[0026] 10 strip-shaped substrates, 20 detection modules, 210 light emitters, 220 light receivers, 230 light blocking members, 30 conduits, 310 reflecting surfaces, 320 blocking members, 40 shielding plates, 50 indicator lights, 60 epoxy resins, 70 signal lines Specific embodiments

[0027] The preferred embodiments of the present utility model will be described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only for the purpose of illustrating and explaining the present utility model, and are not used to limit the present utility model.

[0028] In order to better illustrate the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0029] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope protected by the embodiments of the present application.

[0030] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0031] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims. In the description of the present application, it should be understood that the terms "first", "second", "third", etc. are only used to distinguish similar objects, and do not have to be used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0032] In addition, in the description of the present application, unless otherwise specified, "a plurality of" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0033] CombineFigures 1 to 5 As shown in the figure, the utility model provides a liquid level detection sensor, which includes: a strip-shaped substrate 10; at least one group of detection modules 20, which are arranged on the strip-shaped substrate 10; the detection module 20 includes a light emitter 210 and a light receiver 220; the light emitter 210 and the light receiver 220 are arranged along the axial direction of the strip-shaped substrate 10; a conduit 30, which is sleeved outside the strip-shaped substrate 10, and the conduit 30 is provided with a reflecting surface 310, and the reflecting surface 310, the light emitter 210 and the light receiver 220 are on the same optical path.

[0034] Specifically, at least one group of detection modules 20 are arranged on the strip-shaped substrate 10. Among them, the number of the detection modules 20 depends on actual needs. One group of detection modules 20 can be set to detect a specified liquid level, or three groups of detection modules 20 as shown in Figure 1 the figure can be set to detect three specified liquid levels. The working principle of this liquid level detection sensor is as follows:

[0035] ① As shown in Figure 4 the figure, when the liquid in the container does not reach the specified liquid level, the light emitted by the light emitter 210 is directed to the reflecting surface 310 (the outer wall surface of the conduit 30) of the conduit 30, and the reflecting surface 310 reflects the light into the light receiver 220. After receiving the light, the light receiver 220 emits a first signal. After receiving the first signal, the control device signal-connected to the liquid level detection sensor determines that the liquid level in the current container does not reach the specified liquid level;

[0036] ② As shown in Figure 5 the figure, when the liquid in the container reaches the specified liquid level, the light emitted by the light emitter 210 is directed to the reflecting surface 310 of the conduit 30. Since the refractive index of the conduit 30 is the same as that of the liquid (total reflection principle), the light will be emitted outside the conduit 30. After the light receiver 220 cannot receive the light, it emits a second signal. After receiving the second signal, the control device signal-connected to the liquid level detection sensor determines that the liquid level in the current container reaches the specified liquid level. The above-mentioned first signal and second signal can be transmitted in the form of high-level signals and low-level signals.

[0037] This application abandons the structural layout method of the prior art, innovatively sets the light emitter 210 and the light receiver 220 distributed along the axial direction of the strip-shaped substrate 10 on the strip-shaped substrate 10, reasonably utilizes the spatial distribution of the vertical space, and uses the reflecting surface 310 on the conduit 30 to reflect light, so that the light emitter 210 and the light receiver 220 can be closer to the wall of the conduit 30, making the entire liquid level detection sensor narrower and thinner, so as to be applicable to narrow containers.

[0038] It should be noted that the axial direction of the strip-shaped substrate 10 is the same as the length direction of the strip-shaped substrate 10. The length of the strip-shaped substrate 10 is set to be less than the length of the conduit 30, and the lengths of the strip-shaped substrate 10 and the conduit 30 can be changed accordingly according to the number and positions of the detection modules 20.

[0039] In one embodiment, the detection module 20 further includes a light-blocking member 230, and the light-blocking member 230 is disposed between the light emitter 210 and the light receiver 220. By blocking the light scattered by the light emitter 210 with the light-blocking member 230, the detection accuracy of the light receiver 220 is effectively improved, and misjudgment is avoided. Further, the light-blocking member 230 is made of a light-impermeable material.

[0040] In one embodiment, the light emitter 210 and the receiver are arranged at an angle, and the angle range is 30° to 180°. Preferably, the light emitter 210 and the receiver are arranged at 90°.

[0041] In one embodiment, the liquid level detection sensor further includes a shielding plate 40, and the shielding plate 40 and the strip-shaped substrate 10 are respectively located on opposite sides of the detection module 20; the detection module 20 is fixed and limited by the combined action of the shielding plate 40 and the strip-shaped substrate 10; in addition, the shielding plate 40 can block the light scattered by the light emitter 210, preventing the scattered light from being reflected into the light receiver 220 after hitting other positions of the conduit 30, and at the same time, preventing the light in the external environment from affecting the light receiver 220, effectively improving the detection accuracy of the light receiver 220 and avoiding misjudgment.

[0042] Further, the shielding plate 40 is arranged parallel to the strip-shaped substrate 10 so that the entire liquid level detection sensor can be made narrower and thinner.

[0043] Further, the shielding plate 40 and the strip-shaped substrate 10 can be connected by a connecting member to determine the position of the shielding plate 40 relative to the strip-shaped substrate 10.

[0044] In one embodiment, a circuit is etched on the strip-shaped substrate 10, and the circuit is electrically connected to the detection module 20, and the circuit is used for electrical connection and signal transmission with the detection module 20, and to reduce the thickness of the entire liquid level detection sensor.

[0045] In another embodiment, a circuit board can also be provided on the strip-shaped substrate 10, and the detection module 20 is provided on the circuit board.

[0046] In one embodiment, the liquid level detection sensor further includes an indicator light 50. The indicator light 50 is disposed on the strip-shaped substrate 10 and is electrically connected to the detection module 20 for lighting up according to the detection situation of the detection module 20. When the liquid in the container reaches the specified liquid level, the corresponding indicator light 50 lights up to intuitively notify the user that the specified liquid level has been reached. When the liquid in the container does not reach the specified liquid level, the corresponding indicator light 50 goes out.

[0047] In one embodiment, the indicator light 50 and the detection module 20 are disposed on the same side of the strip-shaped substrate 10 to better reduce the thickness of the entire liquid level detection sensor.

[0048] In one embodiment, a transparent medium is encapsulated between the conduit 30, the strip-shaped substrate 10, and the detection module 20. In one embodiment, the transparent medium is epoxy resin 60. The space inside the conduit 30 is encapsulated by the epoxy resin 60 to fix the positions of the strip-shaped substrate 10 and the detection module 20. At the same time, the refractive index of the epoxy resin 60 is the same as that of the conduit 30, so that when the liquid in the container does not reach the specified liquid level, the light emitted by the light emitter can be reflected to the light receiver 220 via the reflecting surface 310, and when the liquid in the container reaches the specified liquid level, the light emitted by the light emitter can be emitted out of the container via the reflecting surface.

[0049] In another embodiment, the transparent medium can also be other media such as oil.

[0050] In one embodiment, blocking members 320 are provided at both ends of the conduit 30, and a wire passing hole for the passage of a signal line 70 is provided on one of the blocking members 320.

[0051] In one embodiment, the conduit 30 and the epoxy resin 60 are transparent.

[0052] In one embodiment, the shape of the conduit 30 can be cylindrical, square cylindrical, or other cylindrical shapes.

[0053] According to the disclosure and teachings of the above specification, those skilled in the art to which the present invention pertains can also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the present invention.

Claims

1. A liquid level detection sensor, characterized in that: include: strip substrate; At least one set of detection modules, which are arranged on the strip substrate; The detection module comprises a light emitter and a light receiver; the light emitter and the light receiver are distributed along the axial direction of the strip substrate; The conduit is sleeved outside the strip-shaped substrate, and the conduit is provided with a reflecting surface, and the reflecting surface, the light transmitter and the light receiver are on the same optical path.

2. The liquid level detection sensor according to claim 1, characterized in that: The detection module also includes a light blocking member, which is arranged between the light emitter and the light receiver.

3. The liquid level detection sensor according to claim 1, characterized in that: The optical transmitter and the receiver are arranged at an angle, and the angle ranges from 30° to 180°.

4. The liquid level detection sensor according to claim 1, characterized in that: The liquid level detection sensor further comprises a shielding plate, and the shielding plate and the strip substrate are respectively located at two opposite sides of the detection module.

5. The liquid level detection sensor according to claim 4, characterized in that: The shielding plate is arranged parallel to the strip-shaped substrate.

6. The liquid level detection sensor according to claim 1, characterized in that: A circuit is etched on the strip substrate, and the circuit is electrically connected to the detection module.

7. The liquid level detection sensor according to claim 1, characterized in that: The liquid level detection sensor also includes an indicator light, which is disposed on the strip substrate and is electrically connected to the detection module for lighting up according to the detection status of the detection module.

8. The liquid level detection sensor according to claim 7, characterized in that: The indicator light and the detection module are arranged on the same side of the strip substrate.

9. The liquid level detection sensor according to claim 1, characterized in that: A transparent medium is encapsulated between the conduit, the strip substrate and the detection module.

10. The liquid level detection sensor according to claim 1, characterized in that: Both ends of the conduit are provided with blocking pieces, and one of the blocking pieces is provided with a wire hole for the line to pass through.

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