A waterproof temperature sensor with lead anti-pulling

Abstract

The utility model discloses a waterproof temperature sensor of leading wire anti -pulling, related to sensor technical field, solved the weak anti -pulling ability of current technical scheme, waterproof unstable technical problem, including cable and temperature measuring sheet, be provided with the sealing seat on the temperature measuring sheet, the temperature measuring sheet is located in the sealing seat, the utility model counted cable 180 degree bending U -shaped wiring structure, when cable is subjected to external pulling force, the force first acts on the outlet of cable and sealing cabin, and is passed through the bending cable and is transmitted to the solid structure of sealing cabin and glue injection cylinder. Fragile electrical connection point because located in the end of the pulling force transmission path position, hardly bears any direct tensile stress, solved the technical problem of electrical connection disconnecting or damaging due to accidental pulling, makes the sensor in installation, use and maintenance process can bear stronger mechanical tensile, the reliability is enhanced obviously, effectively prolongs the service life of product.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensor technology, specifically a waterproof temperature sensor with a lead wire designed to prevent pulling. Background Technology

[0002] This invention relates to the technical field of temperature sensors, which are core components that convert physical quantities of temperature into electrical signals and are widely used in many fields such as industrial automation, environmental monitoring, medical equipment, home appliances, and new energy. In many application scenarios, temperature sensors need to operate in humid, liquid-immersed, or vibration- and mechanically stretched environments, making the sensor's waterproof performance and the reliability of its lead connections key indicators for evaluating its performance.

[0003] Commonly available waterproof temperature sensors typically encapsulate the temperature sensing element within a metal or plastic probe, connecting to external devices via a lead cable. Traditional waterproofing methods primarily involve: 1) Encapsulating the temperature sensing element and lead connection points with epoxy resin or similar adhesives. While this provides basic waterproofing and insulation, it has inherent drawbacks. Improper encapsulation can create air bubbles or gaps, allowing moisture to seep through these tiny channels during prolonged use or in alternating hot and cold environments, leading to short circuits or corrosion and ultimately sensor failure. 2) Directly soldering the cable to the temperature sensing element's pins and then shrinking the solder joint with heat-shrink tubing provides insulation and initial waterproofing. However, this structure has poor mechanical strength. Accidental pulling forces on the cable directly impact the fragile solder joint, easily causing it to break or the wire to detach from the pad, resulting in permanent sensor damage. Furthermore, heat-shrink tubing has limited sealing performance and is ill-suited for pressurized liquid environments. Some designs use simple crimp terminals to connect the cable and the temperature sensor. While this avoids soldering, the crimped points are prone to oxidation in humid environments, leading to increased contact resistance, affecting measurement accuracy, and even causing signal interruption. Furthermore, their tensile strength is generally insufficient.

[0004] External tensile forces are often directly transmitted to electrical connection points, easily causing connection failure, poor product reliability, and short service life. Simple potting or sealing methods cannot guarantee waterproof reliability in long-term, complex, or harsh environments, posing a risk of leakage. After vibration, impact, or prolonged use, internal welded or crimped points may loosen or experience poor contact, affecting the stability and accuracy of measurement signals.

[0005] In summary, existing technical solutions suffer from weak tensile strength and unstable waterproofing. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a waterproof temperature sensor with a lead wire designed to prevent pulling, thus solving the technical problems of weak pull resistance and unstable waterproofing in existing solutions.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a waterproof temperature sensor with pull-resistant lead wire, comprising a cable and a temperature measuring element. A sealing seat is provided on the temperature measuring element, which is housed within the sealing seat. A glue injection cylinder is fixedly installed on the sealing seat, and a sealing chamber is provided at the upper end of the glue injection cylinder. A contact structure is provided on the rear wall of the temperature measuring element. The cable passes through the sealing chamber and then bends 180° to connect to the contact structure. The temperature measuring element is installed within the sealing seat, and the contact structure behind it enhances its pull-resistant performance through a unique cable connection method. The cable first passes through the upper sealing chamber, then makes a large 180° bend, and then returns to connect to the lower contact structure. This U-shaped cable routing design ensures that when the cable is subjected to external pulling force, the force primarily acts on the walls of the sealing chamber and the glue injection cylinder, rather than directly on the vulnerable electrical connection points. This stress transfer mechanism greatly enhances the structural stability and durability of the sensor, effectively preventing the cable from falling off the temperature sensor connection point or making poor contact due to accidental pulling, thereby significantly improving the reliability and service life of the product.

[0008] Preferably, the contact structure includes multiple sets of contact posts. The temperature sensor is provided with detection terminals, each of which is located within a contact post. Clamping seats are provided on both sides of each contact post. The cable passes through a pair of clamping seats, each clamping seat having a wire-clamping screw. The detection terminals make contact with the cable for electrical connection. The contact structure is located within the glue-filling cylinder and consists of multiple sets of contact posts, with the detection terminals of the temperature sensor securely positioned inside the contact posts. Clamping seats are symmetrically arranged on both sides of each contact post. The cable's conductor core passes through these clamping seats and is mechanically locked in place by the wire-clamping screws. This design has dual advantages: the screw fastening achieves a firm and stable physical crimping and electrical connection between the cable and the detection terminals, avoiding potential issues with incomplete soldering or detachment in traditional welding methods; the clamping seats and wire-clamping screws together form a strong mechanical fixation, ensuring the cable will not loosen even under vibration or impact conditions, thus guaranteeing the continuity and accuracy of signal transmission.

[0009] Preferably, the upper end of the glue injection tube is provided with a glue injection port, and insulating and sealing glue is filled between the glue injection tube and the back of the temperature measuring element. This solution provides a glue injection port on the glue injection tube, and through this port, insulating and sealing glue is filled into the cavity between the back of the temperature measuring element and the internal structure. After curing, this glue forms a dense, seamless protective layer. This protective layer completely isolates all internal electronic components from the external environment, effectively preventing the intrusion of moisture, humidity, dust, etc., thereby achieving a high level of waterproof and moisture-proof effect. The glue firmly seals the internal components together, forming a robust whole, further enhancing the structure's vibration and impact resistance, and completely eliminating the problem of internal component displacement or loose connection points that may occur due to long-term use or environmental changes.

[0010] Preferably, an anti-bending sleeve is provided at the connection between the cable and the sealed chamber. The anti-bending sleeve has an annular gasket. The anti-bending sleeve is a rubber sleeve. At the connection outlet between the cable and the sealed chamber, an additional anti-bending sleeve made of elastic material such as rubber is provided. This anti-bending sleeve provides a smooth transition, effectively dispersing and buffering the stress on the cable during bending, preventing excessive stress concentration at a single point that could lead to damage to the cable sheath or breakage of the internal core wire. Furthermore, the annular gasket integrated on the anti-bending sleeve can fit tightly against the opening of the sealed chamber during assembly, providing auxiliary sealing and further enhancing the waterproof and dustproof capabilities of the lead wire outlet, thereby improving the weather resistance and reliability of the entire sensor.

[0011] Preferably, the sealed chamber is filled with sealing foam. After curing, the foam material fills all the gaps within the sealed chamber, firmly covering and positioning the cable section that has been bent 180°. This not only provides strong support for the U-shaped bend of the cable, making it more stable under tension and ensuring that stress is effectively transferred to the chamber, but the foam material itself also has excellent sealing and cushioning properties, forming a second protective barrier after the insulating sealant, further improving the sensor's overall waterproof, moisture-proof, and vibration-resistant performance.

[0012] Preferably, a sealing cover is fixedly installed on the sealed chamber. The function of the sealing cover is to seal the entire internal components of the sensor, providing a sealed cavity for filling with insulating sealant and sealing foam, and protecting the internal components from external physical damage. The installation of the sealing cover ensures the integrity and sealing performance of the sensor structure. Beneficial effects

[0013] This invention provides a waterproof temperature sensor with a pull-resistant lead wire. The design incorporates a U-shaped cable routing structure with a 180° bend. When the cable is subjected to external pulling force, the force is first applied at the outlet of the cable and the sealed chamber, and then transmitted through the bend to the robust structure of the sealed chamber and the injection cylinder. The fragile electrical connection point, located at the end of the force transmission path, experiences almost no direct tensile stress, solving the technical problem of electrical connection breakage or damage due to accidental pulling. This allows the sensor to withstand stronger mechanical tension during installation, use, and maintenance, significantly enhancing reliability and effectively extending the product's lifespan. By filling the injection cylinder with insulating sealant, the core electrical components, such as the temperature sensor and contact structure, are integrally sealed, forming a dense, seamless primary waterproof layer that effectively resists the intrusion of liquids and moisture. Sealing foam is filled inside the sealed chamber, providing secondary encapsulation of the cable bend, forming a second auxiliary waterproof and buffer layer. An anti-bend sleeve with an annular gasket at the cable outlet further enhances the sealing of the lead wire area. This ensures that the sensor maintains stable performance even in harsh environments such as long-term immersion or high humidity. Attached Figure Description

[0014] Figure 1 This is a front cross-sectional view of the waterproof temperature sensor with anti-pull properties for the lead wire described in this utility model.

[0015] In the diagram: 1. Cable; 2. Temperature sensor; 3. Sealing seat; 4. Glue injection cylinder; 5. Sealing chamber; 6. Contact post; 7. Detection terminal; 8. Clamping seat; 9. Wire clamping screw; 10. Glue injection port; 11. Insulating sealant injection; 12. Anti-bending sleeve; 13. Annular gasket; 14. Sealing foam; 15. Sealing cap; Detailed Implementation

[0016] To further illustrate the technical means and effects adopted by this utility model to achieve its intended purpose, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Detailed description follows.

[0017] Please see Figure 1This utility model provides a technical solution: a waterproof temperature sensor with a lead wire designed to resist pull, comprising a cable 1 and a temperature measuring element 2. A sealing seat 3 is provided on the temperature measuring element 2, which is housed within the sealing seat 3. A glue injection cylinder 4 is fixedly installed on the sealing seat 3, and a sealing chamber 5 is provided at the upper end of the glue injection cylinder 4. A contact structure is provided on the rear wall of the temperature measuring element 2. The cable 1 passes through the sealing chamber 5 and then bends 180° to connect to the contact structure. The temperature measuring element 2 is installed within the sealing seat 3, and the contact structure behind it is enhanced with a unique cable 1 connection method to improve its pull resistance. The cable 1 first passes through the upper sealing chamber 5, then makes a large 180° bend, and then returns to connect to the lower contact structure. This U-shaped cable routing design ensures that when the cable 1 is subjected to external pulling force, the force is mainly applied to the walls of the sealing chamber 5 and the glue injection cylinder 4, rather than directly to the vulnerable electrical connection points. This stress transfer mechanism greatly enhances the structural stability and durability of the sensor, effectively preventing the cable 1 from falling off the connection point of the temperature measuring plate 2 or causing poor contact due to accidental pulling, thereby significantly improving the reliability and service life of the product.

[0018] In this embodiment, the contact structure is further configured such that it includes multiple sets of contact posts 6, the temperature measuring element 2 is provided with detection terminals 7, each detection terminal 7 is disposed within a contact post 6, and clamping seats 8 are provided on both sides of the contact post 6. The cable 1 passes through a pair of clamping seats, and the clamping seats are provided with wire clamping screws 9. The detection terminals 7 are in contact with and electrically connected to the cable 1. The contact structure is disposed within the glue injection cylinder 4 and is composed of multiple sets of contact posts 6. The detection terminals 7 of the temperature measuring element 2 are securely disposed within the contact posts 6. Clamping seats 8 are symmetrically arranged on both sides of each contact post 6. The conductor core of the cable 1 passes through the pair of clamping seats 8 and is mechanically locked by the wire clamping screws 9. This design has a dual advantage: by fastening with screws, a firm and stable physical crimping and electrical connection is achieved between cable 1 and detection terminal 7, avoiding the problems of incomplete soldering or desoldering that may exist in traditional welding methods; the clamping seat 8 and the clamping screw 9 together form a strong mechanical fixation, which can ensure that cable 1 will not loosen even in vibration or impact environments, thereby ensuring the continuity and accuracy of signal transmission.

[0019] In this embodiment, the upper end of the glue injection cylinder 4 is provided with a glue injection port 10, and insulating and sealing glue 11 is filled between the glue injection cylinder 4 and the back of the temperature measuring element 2. This solution provides a glue injection port 10 on the glue injection cylinder 4, and through this port, insulating and sealing glue 11 is filled into the cavity between the back of the temperature measuring element 2 and the internal structure. After curing, this glue forms a dense, seamless protective layer. This protective layer completely isolates all internal electronic components from the external environment, effectively preventing the intrusion of moisture, humidity, dust, etc., thereby achieving a high level of waterproof and moisture-proof effect. The glue firmly seals the internal components together, forming a robust whole, further enhancing the structure's vibration and impact resistance, and completely eliminating the problem of internal component displacement or loose connection points that may occur due to long-term use or environmental changes.

[0020] In this embodiment, an anti-bending sleeve 12 is provided at the connection between the cable 1 and the sealed chamber 5. An annular gasket 13 is provided on the anti-bending sleeve 12. The anti-bending sleeve 12 is a rubber sleeve. An additional anti-bending sleeve 12 made of elastic material such as rubber is provided at the connection outlet of the cable 1 and the sealed chamber 5. This anti-bending sleeve 12 provides a smooth transition, effectively dispersing and buffering the stress on the cable 1 during bending, preventing excessive stress concentration at one point that could lead to damage to the outer sheath of the cable 1 or breakage of the internal core wire. Furthermore, the annular gasket 13 integrated on the anti-bending sleeve 12 can fit tightly against the opening of the sealed chamber 5 during assembly, playing a supporting sealing role, further enhancing the waterproof and dustproof capabilities of the lead wire outlet, and improving the weather resistance and reliability of the entire sensor.

[0021] In this embodiment, the sealed chamber 5 is further configured to be filled with sealing foam 14. After the foam material is filled and cured, it can fill all the gaps in the sealed chamber 5, firmly covering and positioning the cable 1 portion that has been bent at 180°. This not only provides strong support for the U-shaped bend of the cable 1, making its shape more stable when pulled and ensuring that stress can be effectively transferred to the chamber, but the foam material itself also has excellent sealing and cushioning properties, forming a second protective barrier after the insulating sealant injection 11, further improving the overall waterproof, moisture-proof and vibration-resistant performance of the sensor.

[0022] In this embodiment, a sealing cover 15 is fixedly installed on the sealed chamber 5. The function of the sealing cover 15 is to seal the entire internal components of the sensor, provide a sealed cavity for filling the insulating sealant 11 and sealing foam 14, and protect the internal components from external physical damage. The installation of the sealing cover 15 ensures the integrity and sealing of the sensor structure.

[0023] Its detailed connection methods are well-known technologies in this field; such as Figure 1As shown, firstly, the core temperature sensor 2 is installed and fixed in the designated groove or position of the sealing seat 3. The temperature sensor 2 integrates detection terminals 7 for signal output. The end of the external cable 1 is stripped to expose the internal multi-strand wire cores. These wire cores are then connected to the detection terminals 7 of the temperature sensor 2. The wire cores of cable 1 are passed between the clamping seats 8 located on both sides of the contact post 6. The wire clamping screws 9 on the clamping seats 8 are tightened, pressing the wire cores firmly onto the detection terminals 7, forming a stable, low-resistance electrical connection. The cable 1, with the terminals already connected, is led out from the top of the sensor, from side to side. The main body of cable 1 is passed from bottom to top through the sealing chamber 5 at the top of the glue-filling cylinder 4. Inside the sealing chamber 5, it is led out from the side wall, forming a U-shaped bend. The bent end of cable 1 is turned back downwards and connected and fixed to the previously completed contact structure. Cable 1 forms a complete U-shaped loop inside the sensor.

[0024] At the point where cable 1 exits the sealed chamber 5, an anti-bend sleeve 12 is pre-fitted, with an annular gasket 13 on it tightly fitting against the outlet of the sealed chamber 5, serving as a preliminary seal and stress buffer. Sealing foam 14 material is then filled into the interior space of the sealed chamber 5. After curing, this material covers and secures the U-shaped bend of cable 1, providing support and forming an auxiliary sealing layer. Liquid insulating sealant 11 is injected into the injection cylinder 4 through the injection port 10. The sealant fills all gaps, completely covering all internal electronic components and connection points.

[0025] After the adhesive and foaming materials have cured, install and fix the sealing cover 15 on the top of the sealed chamber 5 to complete the encapsulation of the entire sensor.

[0026] The waterproof temperature sensor assembled through the above steps operates as follows: Temperature changes in the external environment are transmitted to the internal temperature sensing element 2 via the sealing base 3, causing a change in the resistance and other electrical characteristics of the temperature sensing element 2. The changing electrical signal is stably transmitted to external detection or control equipment via the detection terminal 7 and the cable 1 secured by the clamping screw 9. The cured insulating sealant 11 and sealing foam 14 form two dense waterproof barriers, completely isolating the internal circuitry from external moisture and liquids, ensuring long-term stable operation of the sensor in humid or underwater environments. When the external cable 1 is accidentally pulled, the tension is first applied to the anti-bend sleeve 12 at the outlet of the sealed chamber 5. Because the cable 1 forms a U-shaped bend internally, the tension is transmitted along the cable 1 to the robust walls of the sealed chamber 5 and the sealant injection cylinder 4, where it is absorbed. The electrical connection point, located at the lower end of the U-shaped loop, experiences almost no direct tensile force due to the change in force direction and buffering. It effectively protects the fragile electrical connection points from being damaged, greatly improving the product's durability and reliability.

[0027] It should be noted that in this paper, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0028] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A waterproof temperature sensor with a pull-resistant lead wire, comprising a cable (1) and a temperature measuring element (2), characterized in that, A sealing seat (3) is provided on the temperature measuring strip (2), the temperature measuring strip (2) is disposed in the sealing seat (3), a glue injection cylinder (4) is fixedly installed on the sealing seat (3), a sealing chamber (5) is provided at the upper end of the glue injection cylinder (4), a contact structure is provided on the rear wall of the temperature measuring strip (2), and the cable (1) passes through the sealing chamber (5) and then bends 180° to connect to the contact structure.

2. A waterproof temperature sensor with anti-pull properties for lead wires according to claim 1, characterized in that, The contact structure includes multiple sets of contact posts (6), and the temperature measuring plate (2) is provided with detection terminals (7). Each detection terminal (7) is located inside the contact post (6). Clamping seats (8) are provided on both sides of the contact post (6). The cable (1) passes through a pair of clamping seats. The clamping seats are provided with wire clamping screws (9). The detection terminal (7) is in contact with the cable (1) and is electrically connected. The contact structure is located inside the glue injection cylinder (4).

3. A waterproof temperature sensor with anti-pull properties for lead wires according to claim 1, characterized in that, The upper end of the glue injection cylinder (4) is provided with a glue injection port (10), and the space between the glue injection cylinder (4) and the back of the temperature measuring plate (2) is filled with insulating and sealing glue (11).

4. A waterproof temperature sensor with anti-pull properties for lead wires according to claim 1, characterized in that, A bend-resistant sleeve (12) is provided at the connection between the cable (1) and the sealed chamber (5). An annular gasket (13) is provided on the bend-resistant sleeve (12). The bend-resistant sleeve (12) is a rubber sleeve.

5. A waterproof temperature sensor with anti-pull properties for lead wires according to claim 1, characterized in that, The sealed chamber (5) is filled with sealing foam (14).

6. A waterproof temperature sensor with anti-pull properties for lead wires according to claim 1, characterized in that, A sealing cover (15) is fixedly installed on the sealed chamber (5).

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