A liquid level sensor

Abstract

The utility model relates to the field of sensors, in particular to a liquid level sensor, comprising a test tube body, a mounting shell and a sensor component, wherein the sensor component comprises an infrared receiver and an infrared transmitter, the mounting shell and the test tube body are integrally formed, the infrared receiver and the infrared transmitter are arranged inside the mounting shell, the receiving end of the infrared receiver and the transmitting end of the infrared transmitter are both facing the inside of the test tube body; the parts of the mounting shell and the test tube body corresponding to the receiving end of the infrared receiver and the transmitting end of the infrared transmitter are transparent parts; the integral molding design of the mounting shell and the test tube body can simplify the processing flow, and can be quickly molded by injection molding and the like, without the need for subsequent secondary assembly; the molding design of the transparent part avoids the transparent part adopting a combined structure to produce stratification and the like, which affects the light emission and reception of the infrared receiver and the infrared transmitter; in addition, the sealing problem existing in the combined structure can be solved.

Description

Technical Field

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

[0002] A liquid level sensor is a sensing device used to monitor the liquid level. In the layout of a liquid level sensor in a liquid flow pipeline, an infrared emitter and an infrared receiver are usually used to output different signals when there is water and no water in the pipeline, so as to determine the liquid level. A liquid level sensor is disclosed in the Chinese utility model patent with the publication number CN218566625U, which embeds a light-transmitting member inside a housing and configures an infrared light-sensitive component to cooperate with the light-transmitting member to realize the monitoring of the pipeline liquid level. The housing and the light-transmitting member used are of a split type, which requires secondary assembly during configuration. At the same time, a sealing ring and the like need to be configured to avoid water leakage at the assembly joint. Summary of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a liquid level sensor that simplifies assembly, reduces the arrangement of components such as sealing rings, and is convenient to implement.

[0004] To solve the above technical problem, the technical solution adopted by the utility model is: a liquid level sensor, including a test tube body, an installation housing, and a sensing component. The sensing component includes an infrared receiver and an infrared emitter. The installation housing and the test tube body are integrally formed. The installation housing is provided with an infrared receiver and an infrared emitter. The receiving end of the infrared receiver and the emitting end of the infrared emitter both face the inside of the test tube body. The parts of the installation housing and the test tube body corresponding to the receiving end of the infrared receiver and the emitting end of the infrared emitter are transparent parts.

[0005] Further, a light guide block is provided inside the installation housing. The two sides of the light guide block are respectively provided with a first light guide inclined surface and a second light guide inclined surface. The receiving end of the infrared receiver faces the first light guide inclined surface, and the emitting end of the infrared emitter faces the second light guide inclined surface.

[0006] Further, the light guide block is in the shape of a truncated isosceles triangle, and the top angle part of the light guide block is concave.

[0007] Further, the inner wall of the test tube body opposite to the receiving end of the infrared receiver and the emitting end of the infrared emitter is a continuous and flat inner wall.

[0008] Further, a hydrophobic layer is provided on the inner wall of the test tube body.

[0009] Further, the materials of the installation housing and the test tube body are PPSU.

[0010] Furthermore, it also includes a circuit board, which is arranged in the installation shell and is electrically connected to the infrared receiver and the infrared transmitter.

[0011] Furthermore, the edge of the circuit board abuts against the inner wall of the mounting shell.

[0012] Furthermore, the back of the installation shell is open, and the interior of the installation shell is provided with a sensor component and a circuit board in sequence toward the back thereof.

[0013] Furthermore, the installation shell is provided with wiring holes for connecting the circuit board.

[0014] The beneficial effects of the utility model are as follows: the infrared receiver and the infrared transmitter of the sensing component can quickly detect the water level inside the test tube body when there is water or no water inside the test tube body; the one-piece molding design of the installation shell and the test tube body can simplify the processing flow, and can be quickly molded by injection molding or the like, without the need for subsequent secondary assembly; in the molding design of the transparent part, the installation shell part and the test tube body part can be continuously molded at the same time, avoiding stratification caused by the combined structure of the transparent part, which affects the emission and reception of light by the infrared receiver and the infrared transmitter; in addition, the sealing problem existing in the combined structure can be solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the front side of the liquid level sensor according to a specific embodiment of the utility model;

[0016] Figure 2 It is a structural schematic diagram of the back side of the liquid level sensor according to a specific embodiment of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the cooperation between the light guide block and the sensor component of the liquid level sensor according to the specific implementation mode of the utility model.

[0018] Description of labels:

[0019] 1. Test tube body; 2. Mounting shell; 3. Infrared transmitter; 4. Infrared receiver; 5. Light guide block; 6. Circuit board; 7. Wiring hole. DETAILED DESCRIPTION

[0020] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes and the accompanying drawings.

[0021] Please refer to Figures 1 to 3A liquid level sensor comprises a test tube body 1, a mounting shell 2 and a sensing component, wherein the sensing component comprises an infrared receiver 4 and an infrared transmitter 3, the mounting shell 2 and the test tube body 1 are integrally formed, the infrared receiver 4 and the infrared transmitter 3 are arranged inside the mounting shell 2, the receiving end of the infrared receiver 4 and the transmitting end of the infrared transmitter 3 are both facing the inside of the test tube body 1; the parts of the mounting shell 2 and the test tube body 1 corresponding to the receiving end of the infrared receiver 4 and the transmitting end of the infrared transmitter 3 are transparent parts.

[0022] From the above description, it can be seen that the beneficial effects of the utility model are: the infrared receiver 4 and the infrared transmitter 3 of the sensing component can quickly detect the water level inside the test tube body 1 when there is water or no water inside the test tube body 1; the one-piece molding design of the mounting shell 2 and the test tube body 1 can simplify the processing flow, and can be quickly molded by injection molding or the like, without the need for subsequent secondary assembly; in the molding design of the transparent part, the mounting shell 2 part and the test tube body 1 part can be continuously molded at the same time, avoiding the transparent part adopting a combined structure and causing stratification, etc., which affects the emission and reception of light by the infrared receiver 4 and the infrared transmitter 3; in addition, it can also solve the sealing problem existing in the combined structure.

[0023] Furthermore, a light guide block 5 is provided in the mounting shell 2, and a first light guide bevel and a second light guide bevel are provided on both sides of the light guide block 5, the receiving end of the infrared receiver 4 is opposite to the first light guide bevel, and the transmitting end of the infrared transmitter 3 is opposite to the second light guide bevel.

[0024] From the above description, it can be seen that the light paths corresponding to the infrared emitter 3 and the infrared receiver 4 are guided by the first light guide bevel and the second light guide bevel of the light guide block 5 to ensure that the light emitted by the infrared emitter 3 can enter the infrared receiver 4 when the test tube body 1 is dry.

[0025] Furthermore, the light guide block 5 is in the shape of an isosceles triangle with its top truncated, and the top corner of the light guide block 5 is concave.

[0026] From the above description, it can be seen that the isosceles triangle design of the light guide block 5 meets the design requirements of the two light guide slopes of the light guide block 5; at the same time, by making the top corner of the light guide block 5 concave, the weight of the device is reduced and material saving is achieved.

[0027] Furthermore, the inner wall of the test tube body 1 opposite to the receiving end of the infrared receiver 4 and the transmitting end of the infrared transmitter 3 is a continuous and smooth inner wall.

[0028] From the above description, it can be seen that using a continuous and flat inner wall as the part corresponding to the receiving end of the infrared receiver 4 and the transmitting end of the infrared transmitter 3 can avoid water accumulation due to depressions in the structural design, thereby affecting the sensor component's judgment of the accurate water level inside the test tube body 1.

[0029] Furthermore, a hydrophobic layer is provided on the inner wall of the test tube body 1 .

[0030] It can be seen from the above description that the design of the hydrophobic layer on the inner wall of the test tube body 1 can prevent the water from flowing incompletely inside the test tube body 1 and accumulating water, thereby affecting the recognition judgment of the sensor component.

[0031] Furthermore, the material of the mounting shell 2 and the test tube body 1 is PPSU.

[0032] From the above description, it can be seen that the installation shell 2 and the test tube body 1 made of PPSU material can meet the requirements of transparency and hydrophobicity of the working surface required by the sensor component, ensure the accurate propagation of the light path and avoid the influence of water accumulation in the tube on the recognition and judgment of the sensor component.

[0033] Furthermore, it also includes a circuit board 6 , which is arranged in the installation shell 2 , and the circuit board 6 is electrically connected to the infrared receiver 4 and the infrared transmitter 3 .

[0034] It can be seen from the above description that the circuit board 6 controls the operation of the infrared receiver 4 and the infrared transmitter 3 and receives the output signal of the sensor component to determine the water level in the test tube body 1 .

[0035] Furthermore, the edge of the circuit board 6 abuts against the inner wall of the mounting housing 2 .

[0036] It can be seen from the above description that the edge of the circuit board 6 is designed to abut against the inner wall of the mounting housing 2, thereby ensuring that the circuit board 6 is mounted and fixed.

[0037] Furthermore, the back of the installation shell 2 is open, and the interior of the installation shell 2 is provided with a sensor component and a circuit board 6 in sequence toward the back thereof.

[0038] As can be seen from the above description, the open design of the back of the mounting housing 2 facilitates the arrangement of the built-in circuit board 6 and sensor components.

[0039] Furthermore, the mounting housing 2 is provided with wiring holes 7 for connecting the circuit board 6 .

[0040] It can be seen from the above description that the wiring hole 7 is designed for power connection and signal output of the circuit board 6.

[0041] Embodiment 1:

[0042] Application scenario: In the design of the existing pipeline liquid level sensor, the water level is monitored by designing the shell, light-transmitting parts and infrared sensor components. The split structure of the shell and light-transmitting parts is often used, which requires secondary assembly during configuration. At the same time, sealing rings are also required to avoid water leakage in the assembly joints.

[0043] like Figures 1 to 3 As shown, the liquid level sensor of this embodiment includes a test tube body 1, a mounting shell 2, a sensor component and a circuit board 6, the sensor component includes an infrared receiver 4 and an infrared transmitter 3, the mounting shell 2 is located at the lower side of the test tube body 1, and the mounting shell 2 is integrally formed with the test tube body 1.

[0044] like Figure 2 and Figure 3 As shown, the mounting housing 2 is rectangular, and its back is open to form a mounting opening. Inside the mounting housing 2, a sensor assembly and a circuit board 6 are sequentially arranged toward the back, and the circuit board 6 is electrically connected to the sensor assembly. The mounting housing 2 is also provided with a wiring hole 7 for connecting the circuit board 6, and the arrangement position of the wiring hole 7 can be adjusted on the circumference of the mounting housing 2 according to the required wiring direction.

[0045] like Figure 3 The installation housing 2 is provided with a light guide block 5, an infrared receiver 4, an infrared transmitter 3 and a circuit board 6. The light guide block 5 is provided with a first light guide slope and a second light guide slope on both sides. The receiving end of the infrared receiver 4 is opposite to the first light guide slope, and the transmitting end of the infrared transmitter 3 is opposite to the second light guide slope. The receiving end of the infrared receiver 4 and the transmitting end of the infrared transmitter 3 are both directed toward the inside of the test tube 1 through the two light guide slopes. In this embodiment, the light guide block 5 is a truncated isosceles triangle, and the vertex of the light guide block 5 is concave.

[0046] The inner wall of the test tube body 1 opposite to the receiving end of the infrared receiver 4 and the transmitting end of the infrared transmitter 3 is a continuous and flat inner wall. In addition, there are no depressions or protrusions on the inner wall along the length direction of the test tube body 1, so that the entire water channel is on the same inner cavity surface, without fault steps, and it is not easy to retain water, thereby avoiding water accumulation due to structural design that affects the use of the sensor component.

[0047] The installation housing 2 and the test tube body 1 connected to the light guide block 5 are transparent parts, and a hydrophobic layer is provided on the inner wall of the test tube body 1. In this embodiment, the installation housing 2 and the test tube body 1 are made of PPSU material as a whole, which can achieve transparency while maintaining good hydrophobic properties, and can meet the use of the sensor component; optionally, only the installation housing 2 and the test tube body 1 corresponding to the working part of the sensor component are designed to be transparent, which can also meet the functional realization of this design.

[0048] like Figure 1 As shown, interfaces are provided on both sides of the test tube body 1, which can be connected to the water channel to be tested for water level monitoring.

[0049] The working principle of the utility model is as follows: when there is no water on the inner wall of the test tube body 1, part of the light emitted by the infrared transmitter 3 cannot be refracted into the air in the test tube body 1, and can only be reflected to the infrared receiver 4, at which time the infrared receiver 4 generates a high-level signal; when there is water on the inner wall of the test tube body 1, the light emitted by the infrared transmitter 3 can be refracted in the water, and no light is emitted to the infrared receiver 4, at which time the infrared receiver 4 generates a low-level signal.

[0050] At the same time, the one-piece design of the mounting shell 2 and the test tube body 1 can simplify the processing and assembly process, ensure structural sealing and accurate propagation of light of the sensor component.

[0051] In summary, the liquid level sensor provided by the utility model can quickly detect the water level inside the test tube body when there is water or no water inside the test tube body through the cooperation of the infrared receiver and the infrared transmitter of the sensing component; the one-piece molding design of the installation shell and the test tube body can simplify the processing process, and can be quickly molded by injection molding and the like, without the need for subsequent secondary assembly; in the molding design of the transparent part, the installation shell part and the test tube body part can be continuously molded at the same time, avoiding stratification caused by the use of a combined structure of the transparent part, which affects the emission and reception of light by the infrared receiver and the infrared transmitter; in addition, it can also solve the sealing problem existing in the combined structure.

[0052] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent transformations made using the contents of the specification and drawings of the present invention, or directly or indirectly applied in the relevant technical field, are also included in the patent protection scope of the present invention.

Claims

1. A liquid level sensor, characterized in that: It includes a test tube body, a mounting shell and a sensor component, the sensor component includes an infrared receiver and an infrared transmitter, the mounting shell and the test tube body are integrally formed, the infrared receiver and the infrared transmitter are arranged inside the mounting shell, the receiving end of the infrared receiver and the transmitting end of the infrared transmitter are both facing the inside of the test tube body; the parts of the mounting shell and the test tube body corresponding to the receiving end of the infrared receiver and the transmitting end of the infrared transmitter are transparent parts.

2. The liquid level sensor according to claim 1, characterized in that: A light guide block is arranged in the installation shell, and a first light guide slope and a second light guide slope are arranged on both sides of the light guide block respectively. The receiving end of the infrared receiver is opposite to the first light guide slope, and the transmitting end of the infrared transmitter is opposite to the second light guide slope.

3. The liquid level sensor according to claim 2, characterized in that: The light guide block is in the form of a truncated isosceles triangle, and the top corner of the light guide block is concave.

4. The liquid level sensor according to claim 1, characterized in that: The inner wall of the test tube body opposite to the receiving end of the infrared receiver and the transmitting end of the infrared transmitter is a continuous and smooth inner wall.

5. The liquid level sensor according to claim 1, characterized in that: The inner wall of the test tube is provided with a hydrophobic layer.

6. The liquid level sensor according to claim 1, characterized in that: The material of the installation shell and the test tube body is PPSU.

7. The liquid level sensor according to claim 1, characterized in that: It also includes a circuit board, which is arranged in the installation shell and is electrically connected to the infrared receiver and the infrared transmitter.

8. The liquid level sensor according to claim 7, characterized in that: The edge of the circuit board abuts against the inner wall of the mounting shell.

9. The liquid level sensor according to claim 7, characterized in that: The back of the installation shell is open, and the interior of the installation shell is provided with a sensor component and a circuit board in sequence toward the back thereof.

10. The liquid level sensor according to claim 7, characterized in that: The installation shell is provided with wiring holes for connecting the circuit board.

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