A dust cover for a sensor

Abstract

This utility model relates to the field of sensor technology, and more particularly to a dust cover for sensors, comprising: a protective component for accommodating and protecting the sensor; the protective component having a light-transmitting structure for exposing the sensor's detection end and a sealing structure for the sensor's wires to pass through; and the protective component being adaptable to sensors of different lengths through deformation. This utility model, through the cooperation of the protective component and the adjusting component, achieves both size adaptability and sealing reliability for different sensors. The protective component is based on a first rigid cylinder, a deformable cylinder, and a second rigid cylinder. The deformable cylinder, combined with the threaded drive of the adjusting component, can adapt to sensors of the same type but different lengths, eliminating the need for custom-made special covers.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and in particular to a dust cover for a sensor. Background Technology

[0002] In the field of sensor applications, dust protection is a key requirement for ensuring long-term stable operation. However, traditional sensor dust covers have many technical limitations. On the one hand, traditional dust covers are mostly designed with fixed sizes, such as using snap-fit ​​or adhesive structures, which can only accommodate sensors of a single specification. When dealing with sensors of the same type but different lengths, custom-made dust covers are required, increasing procurement costs and the need to maintain multiple specifications in stock, thus raising usage and management costs. On the other hand, it is difficult to achieve adequate sealing performance: some dust covers have simple sealing structures, using only a single sealing ring, which can only initially block dust and allows it to easily infiltrate through gaps between the detection end and the wire exit end, affecting the sensor's lifespan. Utility Model Content

[0003] The purpose of this invention is to provide a dust cover for sensors, which solves the problems of fixed size and poor adaptability of traditional sensor dust covers.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A dust cover for a sensor, comprising: A protective assembly for housing and protecting a sensor, the protective assembly having a light-transmitting structure for exposing the sensor's detection end, a sealed structure for the sensor's wires to pass through, and the protective assembly being adaptable to sensors of different lengths through deformation; The adjustment component, fitted outside the protective component, can drive the protective component to retract or expand. It is used to adjust the size of the protective component to fit the sensor, so that the sensor detection end fits tightly with the light-transmitting structure. The sealing structure wraps and fixes the sensor wires, thus achieving sealed protection for the sensor. Preferably, the protective assembly includes a first rigid cylinder, a deformable cylinder, and a second rigid cylinder that are fixedly connected in sequence; the light-transmitting structure is a lens disposed at the end of the first rigid cylinder away from the deformable cylinder; the sealing structure includes an annular sealing plug disposed at the end of the second rigid cylinder away from the deformable cylinder, and a circular block rotatably connected inside the second rigid cylinder, wherein a deformable annular elastic pad is fixedly installed on the surface of the circular block; the sensor is disposed inside the protective assembly, with its detection end abutting against the lens, and its wiring terminal wire passing through the sealing plug.

[0005] Preferably, the adjusting assembly includes a first threaded cylinder and a second threaded cylinder. One end of the first threaded cylinder is fixedly sleeved on the surface of the second rigid cylinder, and an installation gap is reserved between the two. One end of the second threaded cylinder is rotatably sleeved on the surface of the first rigid cylinder, and the other end is threadedly connected to the first threaded cylinder through a threaded engagement. Preferably, the sealing plug is threadedly connected to the second rigid cylinder, and the end of the sealing plug facing the elastic pad is configured as a trumpet-shaped structure; when the sealing plug is screwed in relative to the second rigid cylinder, the inner wall of its trumpet-shaped structure gradually squeezes the elastic pad to deform towards the middle. Preferably, a sealing layer is provided at the connection between the lens and the first rigid tube, and the sealing layer is arranged around the edge of the lens to seal the gap between the lens and the first rigid tube.

[0006] Preferably, the lens is made of a high-transmittance material and the lens surface is provided with an anti-reflection layer; the high-transmittance material is selected from quartz glass, optical grade PMMA or high-transmittance PC, and the anti-reflection layer is a silicon dioxide anti-reflection film.

[0007] This utility model has at least the following beneficial effects: By combining protective and adjusting components, both size adaptability and sealing reliability can be achieved for different sensors. The protective component is based on a first rigid cylinder, a deformable cylinder, and a second rigid cylinder. The deformable cylinder, combined with the threaded drive of the adjusting component, can adapt to sensors of the same type but different lengths, without the need for custom-made special sleeves. Attached Figure Description

[0008] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This utility model Figure 1 Sectional view; Figure 3 This is a schematic diagram of the deformable cylinder structure of this utility model; Figure 4 This is a schematic diagram of the adjustment component structure of this utility model.

[0010] In the figure: 1. Protective component; 11. First rigid cylinder; 12. Deformable cylinder; 13. Second rigid cylinder; 2. Light-transmitting structure; 3. Circular block; 4. Elastic pad; 5. Sealing plug; 6. Adjustment component; 61. First threaded cylinder; 62. Second threaded cylinder. Detailed Implementation

[0011] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0012] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0013] Reference Figure 1-4 A dust cover for a sensor, comprising: The protective component 1 is used to house and protect the sensor. The protective component 1 has a light-transmitting structure 2 for exposing the sensor detection end and a sealed structure for the sensor wire to pass through. The protective component 1 can be adapted to sensors of different lengths by deformation. Adjustment component 6, sleeved outside of protective component 1, can drive protective component 1 to retract or expand, used to adjust protective component 1 to fit the sensor size, so that the sensor detection end is tightly fitted with light-transmitting structure 2, and forms a wrapping and fixing of sensor wires through sealing structure to achieve sealed protection of sensor. The protective component 1, through its own deformation, breaks the limitation of the traditional "fixed size" of dust covers, and can adapt to sensors of the same type with different lengths. The specific adaptation range can be adjusted according to the elastic coefficient of the deformable structure material, eliminating the need to customize dust covers for sensors of different lengths and reducing usage costs. The adjustment component 6, by driving the deformation of the protective component 1, ensures that the sensor detection end fits seamlessly with the light-transmitting structure 2, preventing dust from entering through gaps between the detection end and the light-transmitting structure 2. On the other hand, it wraps and fixes the wires through the sealing structure, preventing dust from entering from the wire exit point, forming a double seal at the detection end and the wire end. The light-transmitting structure 2 needs to ensure the effective transmission of the sensor detection signal, so its transmittance must match the sensor's detection wavelength to avoid signal attenuation due to insufficient transmittance, which would affect the sensor's accuracy.

[0014] Furthermore, the protective assembly 1 includes a first rigid cylinder 11, a deformable cylinder 12, and a second rigid cylinder 13 that are fixedly connected in sequence; the light-transmitting structure 2 is a lens disposed at the end of the first rigid cylinder 11 away from the deformable cylinder 12; the sealing structure includes an annular sealing plug 5 disposed at the end of the second rigid cylinder 13 away from the deformable cylinder 12, and a circular block 3 rotatably connected inside the second rigid cylinder 13, with a deformable annular elastic pad 4 fixedly installed on the surface of the circular block 3; the sensor is disposed inside the protective assembly 1, with its detection end abutting against the lens, and the wiring terminal wire passing through the sealing plug 5; The first rigid cylinder 11 and the second rigid cylinder 13 are made of ABS engineering plastic or aluminum alloy, depending on the sensor's operating environment. Aluminum alloy is preferred for high-temperature environments, while ABS is preferred for corrosive environments. The thickness is 1.5-2mm to ensure structural strength while avoiding excessive weight increase. The deformable cylinder 12 uses corrugated silicone tubing or polyurethane telescopic tubing, which has aging resistance and high / low temperature resistance, ensuring structural stability even under long-term deformation. The components are fixed together by ultrasonic welding (for plastic materials) or laser welding (for metal materials) to prevent dust from entering through the connection gaps. The lens is inserted into the mounting groove at the end of the first rigid cylinder 11 via an interference fit, ensuring the lens... After installation, the lens has a partial protrusion, which facilitates precise contact between the sensor detection end and the lens. At the same time, the edge of the lens fits tightly against the inner wall of the mounting groove, providing a smooth base for the subsequent application of the sealant layer. The annular elastic pad 4 is made of nitrile rubber or fluororubber. In its initial state, its inner diameter is larger than the diameter of the sensor wire, which facilitates the insertion of the wire. After the wire passes through the sealing plug 5 and through the elastic pad 4, the elastic pad 4 is in a "pre-supported" state under the support of the annular block 3, laying the foundation for subsequent tight wrapping by the sealing plug 5. The rotational connection between the annular block 3 and the second rigid cylinder 13 adopts a clearance fit, which can avoid friction generated during the rotation of the sealing plug 5 and the elastic pad 4 after contact, thus preventing wear of the elastic pad 4.

[0015] Furthermore, the adjustment component 6 includes a first threaded cylinder 61 and a second threaded cylinder 62. One end of the first threaded cylinder 61 is fixedly sleeved on the surface of the second rigid cylinder 13, and an installation gap is reserved between the two to provide space for the second threaded cylinder to be screwed in. The inner wall of the first threaded cylinder 61 is provided with an internal thread, and the outer wall of the second threaded cylinder 62 is provided with an external thread that matches the internal thread. One end of the second threaded cylinder 62 is rotatably sleeved on the surface of the first rigid cylinder 11, and the other end is inserted into the installation gap of the first threaded cylinder 61 through a threaded engagement. When the second threaded cylinder 62 is rotated, the first rigid cylinder 11 and the second rigid cylinder 13 can be driven to move closer or further apart through thread transmission, thereby causing the deformable cylinder 12 to contract or expand, so as to realize the adaptation and adjustment of the protective component 1 to the sensor size.

[0016] Furthermore, the sealing plug 5 is threadedly connected to the second rigid cylinder 13, and the end of the sealing plug 5 facing the elastic pad 4 is set in a funnel shape; when the sealing plug 5 is screwed into the second rigid cylinder 13, the inner wall of its funnel shape gradually squeezes the elastic pad 4 to deform towards the middle, so that the elastic pad 4 tightly wraps the sensor wire, improving the sealing and fixing effect of the sealing structure. When the sealing plug 5 is screwed in, the inner wall of the trumpet-shaped structure gradually squeezes the elastic pad 4 from the edge to the center, causing the inner diameter of the elastic pad 4 to gradually shrink from "larger than the wire diameter" to "smaller than the wire diameter", forming an interference fit. This not only achieves a seal but also fixes the wire, preventing the sensor from shifting due to external force pulling the wire. The elastic pad 4 has a Shore hardness of 50-60HA, and it can still maintain good elasticity and recovery after compression deformation. When it is necessary to replace the sensor or wire, the elastic pad 4 can return to its initial state after the sealing plug 5 is screwed out, which is convenient for subsequent reinstallation and use, without the need for frequent replacement of sealing structure components.

[0017] Furthermore, a sealing layer is provided at the connection between the lens and the first rigid cylinder 11. The sealing layer is arranged around the edge of the lens to seal the gap between the lens and the first rigid cylinder 11, so as to prevent dust from entering the protective sleeve from the connection gap and affecting the normal operation of the sensor. The sealant layer uses silicone sealant or polyurethane sealant, which has the characteristics of high and low temperature resistance and aging resistance, and the hardness after curing is moderate, so that gaps will not be generated due to curing shrinkage.

[0018] Furthermore, the lens is made of a high-transmittance material, and the lens surface is provided with an anti-reflection layer; the high-transmittance material is selected from quartz glass, optical-grade PMMA or high-transmittance PC, and the anti-reflection layer is a silicon dioxide anti-reflection film. The transmittance of the high-transmittance material is ≥90%, and the anti-reflection layer can reduce the reflectivity of light on the lens surface, ensuring that the sensor detection end can accurately receive external detection signals and avoid affecting the sensor detection accuracy due to poor light transmittance of the lens material.

[0019] In summary, by working together, the protective component 1 and the adjusting component 6 can achieve both size adaptability and sealing reliability for different sensors. The protective component 1 is based on the first rigid cylinder 11, the deformable cylinder 12, and the second rigid cylinder 13. The deformable cylinder 12, combined with the threaded drive of the adjusting component 6, can adapt to sensors of the same type but different lengths without the need for custom-made special sleeves.

[0020] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A dust cover for a sensor, characterized in that, include: A protective assembly for housing and protecting a sensor, the protective assembly including a deformable cylinder that can adapt to sensors of different lengths through the expansion and contraction of the deformable cylinder, the protective assembly having a light-transmitting structure for exposing the sensor detection end and a sealed structure for the sensor wires to pass through. An adjustment component is fitted outside the protective component. The adjustment component drives the protective component to contract or expand via a threaded drive. It is used to adjust the protective component to fit the sensor size, so that the sensor detection end fits tightly with the light-transmitting structure. The sensor wires are wrapped and fixed by a sealing structure to achieve sealed protection of the sensor.

2. The dust cover for a sensor according to claim 1, characterized in that, The protective assembly includes a first rigid cylinder, a deformable cylinder, and a second rigid cylinder that are fixedly connected in sequence; the light-transmitting structure is a lens located at the end of the first rigid cylinder away from the deformable cylinder; the sealing structure includes an annular sealing plug located at the end of the second rigid cylinder away from the deformable cylinder, and a circular block rotatably connected inside the second rigid cylinder, the surface of which is fixedly fitted with a deformable annular elastic pad; the sensor is located inside the protective assembly, its detection end abutting against the lens, and its wiring terminal wire passing through the sealing plug.

3. A dust cover for a sensor according to claim 1, characterized in that, The adjustment assembly includes a first threaded cylinder and a second threaded cylinder. One end of the first threaded cylinder is fixedly sleeved on the surface of the second rigid cylinder, and an installation gap is reserved between the two. One end of the second threaded cylinder is rotatably sleeved on the surface of the first rigid cylinder, and the other end is threadedly connected to the first threaded cylinder through a threaded fit.

4. A dust cover for a sensor according to claim 2, characterized in that, The sealing plug is threadedly connected to the second rigid cylinder, and the end of the sealing plug facing the elastic pad is designed with a flared structure; when the sealing plug is screwed in relative to the second rigid cylinder, the inner wall of its flared structure gradually squeezes the elastic pad and deforms it toward the middle.

5. A dust cover for a sensor according to claim 2, characterized in that, A sealing layer is provided at the connection between the lens and the first rigid tube. The sealing layer is arranged around the edge of the lens to seal the gap between the lens and the first rigid tube.

6. A dust cover for a sensor according to claim 2, characterized in that, The lens is made of a high-transmittance material and has an anti-reflection layer on its surface; the high-transmittance material is selected from quartz glass, optical-grade PMMA or high-transmittance PC, and the anti-reflection layer is a silicon dioxide anti-reflection film.

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