Photoelectric pipeline liquid level sensor

Abstract

The utility model discloses a photoelectric pipeline liquid level sensor, and belongs to the technical field of liquid level sensors. The pipeline liquid level sensor comprises a shell structure, a pipeline structure, a light emitting device and a light receiving device. A mounting inner cavity is formed in the shell structure, and the light emitting device and the light receiving device are fixedly arranged in the mounting inner cavity of the shell structure; the pipeline structure and the shell structure are integrally formed through light-transmitting materials, a first prism structure integrally formed with the shell structure and the pipeline structure is arranged outside the pipeline structure, and a second prism structure integrally formed with the pipeline structure is arranged in the pipeline structure. And a first reflecting surface arranged on the first prism structure and a second reflecting surface arranged on the second prism structure are used for reflecting an emergent light beam of the light emitting device to the light receiving device. According to the design, the water passing area of the pipeline structure can be guaranteed, the probability that water drops remain on the reflecting surface arranged on the prism structure can be reduced, and then the risk of false alarm caused by the residual water drops is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid level sensors, in particular to a photoelectric pipeline liquid level sensor. Background Art

[0002] The photoelectric pipeline liquid level sensor is a sensor for detecting whether there is water in the pipeline, and is widely used in equipment such as sweeping robots, floor scrubbers, and water dispensers, which transmit liquids through water pipes. Among the existing photoelectric pipeline liquid level sensors, for example, the patent with the publication number CN218035252U discloses a pipeline photoelectric liquid level sensor, which includes a shell structure, a PCBA board, and a pipeline structure. The shell structure is provided with an installation cavity, and the bottom surface of the PCBA board is provided with a light emitter and a light receiver, which are arranged in the installation cavity of the shell structure. The light emitting direction of the light emitter and the light incident direction of the light receiver are both perpendicular to the inner wall corresponding to the installation cavity. The pipeline structure and the shell structure are integrally formed with a light-transmitting material. A prism structure integrally formed therewith is provided on the inner wall of the pipeline structure, and a first optical prism surface and a second optical prism surface are provided on the prism structure. The first optical prism surface is used to reflect the light emitted by the light emitter to the second optical prism surface, and the second optical prism surface is used to reflect the light reflected by the first optical prism surface to the light receiver.

[0003] In the above-mentioned photoelectric liquid level sensor, the first optical prism surface and the second optical prism surface provided on the prism structure are both located in the pipeline structure. However, the space in the pipeline structure is limited. According to the above-mentioned design, it is difficult to reduce the volume ratio of the pipeline structure occupied by the prism structure, so the water flow area of ​​the pipeline structure cannot be guaranteed. Moreover, the first optical prism surface and the second optical prism surface provided on the prism structure are both in contact with water, and the probability of residual water droplets on the optical prism surface is relatively high, which is easy to cause false alarms due to the residual water droplets. Utility Model Content

[0004] The purpose of the utility model is to provide a photoelectric pipeline liquid level sensor in response to the existing technical status. Prism structures are arranged inside and outside the pipeline structure respectively. On the one hand, the water flow area of ​​the pipeline structure can be guaranteed. On the other hand, the probability of residual water droplets on the reflective surface provided on the prism structure can be reduced, thereby reducing the risk of false alarms caused by residual water droplets.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A photoelectric pipeline liquid level sensor comprises a housing structure, a pipeline structure, a light emitting device and a light receiving device;

[0007] The shell structure is provided with an installation cavity, and the light emitting device and the light receiving device are both fixedly arranged in the installation cavity of the shell structure;

[0008] The pipeline structure and the shell structure are integrally formed with a light-transmitting material; a first prism structure integrally formed with the shell structure and the pipeline structure is provided outside the pipeline structure; a first reflecting surface is provided on the first prism structure; a second prism structure integrally formed with the pipeline structure is provided inside the pipeline structure; a second reflecting surface is provided on the second prism structure; the first reflecting surface provided on the first prism structure and the second reflecting surface provided on the second prism structure are used to reflect an outgoing light beam of the light-emitting device to the light-receiving device.

[0009] Furthermore, a light-proof layer is provided on the first reflective surface of the first prism structure.

[0010] Furthermore, the second prism structure is arranged along the water flow direction in the pipeline structure, and its length is smaller than the length of the pipeline structure. A guide slope is provided between the front and rear sides of the second prism structure and the inner wall of the pipeline structure.

[0011] Furthermore, the second prism structure is arranged along the water flow direction in the pipeline structure, and its length is equal to the length of the pipeline structure.

[0012] Furthermore, the light emitting device is an infrared light emitting device, and the light receiving device is an infrared light receiving device.

[0013] Furthermore, the shell structure and the pipeline structure are both made of PC transparent material.

[0014] Furthermore, the optical emitting device and the optical receiving device are both fixedly arranged on a PCBA board, and the PCBA board is fixedly arranged in the mounting inner cavity of the shell structure.

[0015] Furthermore, the PCBA board is connected with an electronic harness extending from the installation cavity to the outside of the installation cavity.

[0016] Furthermore, the light emitting direction of the light emitting device and the light incident direction of the light receiving device are both perpendicular to the inner wall of the installation cavity corresponding thereto, and the angle between the outgoing light beam of the light emitting device and the first reflection surface provided on the first prism structure and the second reflection surface provided on the second prism structure are both 45°.

[0017] Furthermore, a plurality of reinforcement structures are provided between the outer wall of the pipeline structure and the outer wall of the shell structure, and each reinforcement structure is integrally formed with the pipeline structure and the shell structure.

[0018] The beneficial effects of the utility model are:

[0019] The utility model provides a photoelectric pipeline liquid level sensor, in which a first prism structure is arranged outside the pipeline structure, and a second prism structure is arranged inside the pipeline structure. Based on the first reflection surface provided on the first prism structure and the second reflection surface provided on the second prism structure, the outgoing light beam of the light emitting device is reflected to the light receiving device, and whether there is water in the pipeline structure is determined by whether the light receiving device can receive the outgoing light beam of the light emitting device. According to the above design, the utility model arranges the prism structures inside and outside the pipeline structure respectively, which can ensure the water flow area of ​​the pipeline structure on the one hand, and reduce the probability of residual water droplets on the reflection surface provided on the prism structure on the other hand, thereby reducing the risk of false alarms caused by residual water droplets. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a stereoscopic diagram of a photoelectric pipeline liquid level sensor of the utility model;

[0021] Figure 2 This is a schematic diagram of the disassembled structure of a photoelectric pipeline liquid level sensor of the utility model;

[0022] Figure 3 This is a stereoscopic diagram (partial cross-section) of a photoelectric pipeline liquid level sensor of the utility model;

[0023] Figure 4 This is a stereoscopic diagram of a photoelectric pipeline liquid level sensor of the utility model;

[0024] Figure 5 This is a schematic diagram of the working principle of a photoelectric pipeline liquid level sensor of the utility model (when there is no water in the pipeline structure);

[0025] Figure 6 The utility model is a schematic diagram of the working principle of a photoelectric pipeline liquid level sensor (when there is water in the pipeline structure).

[0026] Marking instructions: 1. Shell structure, 2. Pipe structure, 3. Electronic wiring harness, 4. PCBA board, 5. Light emitting device, 6. Light receiving device, 7. First prism structure, 8. Second prism structure, 9. Guide slope. DETAILED DESCRIPTION

[0027] The utility model will be further described below in conjunction with the accompanying drawings.

[0028] See also Figures 1 to 4 As shown, a photoelectric pipeline liquid level sensor includes a housing structure 1, a pipeline structure 2, a light emitting device 5 and a light receiving device 6.

[0029] The housing structure 1 is provided with an installation cavity, and the light emitting device 5 and the light receiving device 6 are both fixedly arranged in the installation cavity of the housing structure 1. Exemplarily, in this embodiment, the light emitting device 5 is an infrared light emitting device, and the light receiving device 6 is an infrared light receiving device.

[0030] In the above technical solution, specifically, the light emitting device 5 and the light receiving device 6 are both fixedly arranged on the PCBA board 4, the PCBA board 4 is fixedly arranged in the installation cavity of the shell structure 1, and the PCBA board 4 is connected with an electronic harness 3 extending from the installation cavity to the outside of the installation cavity.

[0031] The pipeline structure 2 and the shell structure 1 are integrally formed of a light-transmitting material. For example, in this embodiment, the shell structure 1 and the pipeline structure 2 are both made of PC transparent material.

[0032] In the above technical solution, it is preferred that a plurality of reinforcing structures are provided between the outer wall of the pipe structure 2 and the outer wall of the shell structure 1, and each reinforcing structure is integrally formed with the pipe structure 2 and the shell structure 1 to improve the structural strength of the pipe structure 2 and the shell structure 1 after integrally forming.

[0033] The pipe structure 2 is provided with a first prism structure 7 integrally formed with the shell structure 1 and the pipe structure 2, and a first reflection surface is provided on the first prism structure 7. The pipe structure 2 is provided with a second prism structure 8 integrally formed with the pipe structure 2, and a second reflection surface is provided on the second prism structure 8. The first reflection surface provided on the first prism structure 7 and the second reflection surface provided on the second prism structure 8 are used to reflect the outgoing light beam of the light emitting device 5 to the light receiving device 6. Exemplarily, in this embodiment, the light emitting direction of the light emitting device 5 and the light incident direction of the light receiving device 6 are both perpendicular to the inner wall of the installation cavity corresponding thereto, and the outgoing light beam of the light emitting device 5 and the first reflection surface provided on the first prism structure 7 and the second reflection surface provided on the second prism structure 8 are both 45° apart.

[0034] In the above technical solution, the optional implementation schemes for the arrangement of the light emitting device 5 and the light receiving device 6 are as follows:

[0035] As a first embodiment, the first prism structure 7 corresponds to the position of the light emitting device 5, the second prism structure 8 corresponds to the position of the light receiving device 6, the first reflection surface provided on the first prism structure 7 is used to reflect the outgoing light beam of the light emitting device 5 to the second reflection surface provided on the second prism structure 8, and the second reflection surface provided on the second prism structure 8 is used to reflect the light reflected by the first reflection surface provided on the first prism structure 7 to the light receiving device 6;

[0036] As a second implementation scheme, the first prism structure 7 corresponds to the position of the light receiving device 6, the second prism structure 8 corresponds to the position of the light emitting device 5, the second reflection surface provided on the second prism structure 8 is used to reflect the output light of the light emitting device 5 to the first reflection surface provided on the first prism structure 7, and the first reflection surface provided on the first prism structure 7 is used to reflect the light reflected by the second reflection surface provided on the second prism structure 8 to the light receiving device 6.

[0037] It should be noted that the first embodiment is shown in the figure, and the second embodiment is essentially that the light emitting device 5 and the light receiving device 6 are exchanged, which is not shown in the figure.

[0038] In the above technical solution, for the structural design of the first prism structure 7, the optional technical solutions are as follows:

[0039] In order to prevent the external environment of the pipeline liquid level sensor from affecting the reflection effect of the first reflection surface provided on the first prism structure 7, an anti-light transmission layer is provided on the first reflection surface provided on the first prism structure 7. Exemplarily, in this embodiment, the anti-light transmission layer is an anti-light transmission film attached to the first reflection surface or an anti-light transmission ink coated on the first reflection surface.

[0040] In the above technical solution, for the structural design of the second prism structure 8, the optional implementation schemes are as follows:

[0041] As a first implementation scheme, the second prism structure 8 is arranged along the water flow direction in the pipe structure 2, and its length is less than the length of the pipe structure 2. A guide slope 9 is provided between the front and rear sides of the second prism structure 8 and the inner wall of the pipe structure 2 to reduce water resistance.

[0042] As a second implementation scheme, the second prism structure 8 is arranged along the water flow direction in the pipe structure 2 , and its length is equal to the length of the pipe structure 2 .

[0043] The working principle of the pipeline liquid level sensor is as follows:

[0044] See also Figure 5 As shown, when there is no water in the pipe structure 2, the outgoing light beam of the light emitting device 5 is reflected by the first reflection surface provided on the first prism structure 7 and the second reflection surface provided on the second prism structure 8, and returns to the light receiving device 6, and then the light signal is converted into a voltage value output to determine that there is no water in the pipe structure 2. In the figure, the arrow direction is the light path of the outgoing light beam of the light emitting device 5;

[0045] See also Figure 6As shown, when there is water in the pipe structure 2, the outgoing light beam of the light emitting device 5 will be refracted at the second reflection surface provided on the second prism structure 8, causing the light receiving device 6 to fail to receive the light signal, and then convert the light signal into a voltage value output to determine that there is water in the pipe structure 2. In the figure, the arrow direction is the light path of the outgoing light beam of the light emitting device 5.

[0046] In general, the utility model arranges a first prism structure 7 outside the pipe structure 2, and arranges a second prism structure 8 inside the pipe structure 2. Based on the first reflection surface provided on the first prism structure 7 and the second reflection surface provided on the second prism structure 8, the outgoing light beam of the light emitting device 5 is reflected to the light receiving device 6. Whether there is water in the pipe structure 2 is determined by whether the light receiving device 6 can receive the outgoing light beam of the light emitting device 5.

[0047] According to the above design, the utility model arranges prism structures inside and outside the pipeline structure 2 respectively, which can ensure the water flow area of ​​the pipeline structure 2 on the one hand, and reduce the probability of residual water droplets on the reflective surface of the prism structure on the other hand, thereby reducing the risk of false alarm caused by residual water droplets.

[0048] Of course, the above are only preferred implementations of the present utility model, and are not intended to limit the scope of use of the present utility model. Therefore, any equivalent changes made to the principles of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A photoelectric pipeline liquid level sensor, characterized in that: It includes a shell structure, a pipeline structure, a light emitting device and a light receiving device; The shell structure is provided with an installation cavity, and the light emitting device and the light receiving device are both fixedly arranged in the installation cavity of the shell structure; The pipeline structure and the shell structure are integrally formed with a light-transmitting material; a first prism structure integrally formed with the shell structure and the pipeline structure is provided outside the pipeline structure; a first reflecting surface is provided on the first prism structure; a second prism structure integrally formed with the pipeline structure is provided inside the pipeline structure; a second reflecting surface is provided on the second prism structure; the first reflecting surface provided on the first prism structure and the second reflecting surface provided on the second prism structure are used to reflect an outgoing light beam of the light-emitting device to the light-receiving device.

2. The photoelectric pipeline liquid level sensor according to claim 1, characterized in that: A light-proof layer is disposed on the first reflective surface of the first prism structure.

3. A photoelectric pipeline liquid level sensor according to claim 1 or 2, characterized in that: The second prism structure is arranged along the water flow direction in the pipeline structure, and its length is smaller than the length of the pipeline structure. A guide slope is provided between the front and rear sides of the second prism structure and the inner wall of the pipeline structure.

4. A photoelectric pipeline liquid level sensor according to claim 1 or 2, characterized in that: The second prism structure is arranged along the water flow direction in the pipeline structure, and its length is equal to the length of the pipeline structure.

5. The photoelectric pipeline liquid level sensor according to claim 1, characterized in that: The light emitting device is an infrared light emitting device, and the light receiving device is an infrared light receiving device.

6. The photoelectric pipeline liquid level sensor according to claim 1, characterized in that: The shell structure and the pipeline structure are both made of PC transparent material.

7. The photoelectric pipeline liquid level sensor according to claim 1, characterized in that: The optical emitting device and the optical receiving device are both fixedly arranged on a PCBA board, and the PCBA board is fixedly arranged in the installation inner cavity of the shell structure.

8. The photoelectric pipeline liquid level sensor according to claim 7, characterized in that: The PCBA board is connected with an electronic harness extending from the installation inner cavity to the outside of the installation inner cavity.

9. The photoelectric pipeline liquid level sensor according to claim 1, characterized in that: The light emitting direction of the light emitting device and the light incident direction of the light receiving device are both perpendicular to the inner wall of the installation cavity corresponding thereto, and the angle between the outgoing light beam of the light emitting device and the first reflection surface provided on the first prism structure and the second reflection surface provided on the second prism structure is 45 degrees.

10. The photoelectric pipeline liquid level sensor according to claim 1, characterized in that: A plurality of reinforcing structures are arranged between the outer wall of the pipeline structure and the outer wall of the shell structure, and each reinforcing structure is integrally formed with the pipeline structure and the shell structure.

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