Waterproof temperature sensor

Abstract

The utility model relates to the technical field of temperature sensors, and discloses a waterproof temperature sensor, which comprises a waterproof lower shell, a sensor main body is arranged in the waterproof lower shell, a waterproof upper shell matched with the waterproof lower shell is arranged above the waterproof lower shell, a conical waterproof joint is vertically arranged in the middle of the upper surface of the waterproof upper shell, and the conical waterproof joint is connected with the sensor main body. And a sealing plug is nested in the conical waterproof joint. According to the waterproof temperature sensor, through a combined structure of the conical waterproof connector, the sealing plug and the fastening nut, dynamic sealing of the connecting position of the signal transmission line is achieved, axial pressure generated when the fastening nut is screwed enables the sealing plug to elastically deform, the signal transmission line is tightly wrapped, and compared with a traditional fixed sealing structure, the waterproof temperature sensor is convenient to use. The sensor can adapt to cables of different specifications and keep a sealing effect for a long time, effectively prevents water seepage risks caused by cable shaking and thermal expansion and cold contraction, and ensures that the sensor stably transmits temperature data under extreme environments such as underwater and high humidity.

Description

Technical Field

[0001] This utility model relates to the field of temperature sensor technology, specifically a waterproof temperature sensor. Background Technology

[0002] A temperature sensor is a sensor that can sense temperature and convert it into a usable output signal. It has a wide range of applications in many fields such as industrial production, meteorological monitoring, and smart homes.

[0003] The existing patent document CN220063199U discloses a waterproof temperature sensor. This utility model can seal the back of the sensor housing by setting a sensor back cover and a waterproof sealing gasket, and facilitates the maintenance of the components inside the sensor housing. By setting the sensor housing, the waterproof and impermeable properties of the temperature sensor mechanism are guaranteed, and it has high strength, good corrosion resistance, and is not easily damaged by water ingress. Setting the sensor detection head on the outside of the sensor housing can prevent moisture from entering, thus solving the problem of poor waterproofness and easy damage from moisture in the existing temperature sensors.

[0004] However, existing waterproof temperature sensors have many flaws in their waterproof design at the signal transmission line connection. Most products use traditional fixed sealing structures, such as directly opening a fixed-size wire hole in the housing and then simply sealing it with glue or ordinary rubber rings. This method is difficult to adapt to cables of different specifications. Once the cable is connected, if the wire hole size does not match, gaps will appear, leading to water leakage. Moreover, glue will age and lose its adhesiveness over long-term use, and ordinary rubber rings are also prone to hardening and cracking due to environmental factors, greatly reducing the sealing effect. In addition, traditional structures cannot cope with the effects of cable shaking and thermal expansion and contraction. In actual use, it is very common for cables to be subjected to external forces and equipment vibrations. Ordinary sealing structures cannot adjust accordingly, leading to sealing failure. In environments with large temperature changes, the dimensional changes of cables due to thermal expansion and contraction will also create gaps in the originally tight seal, allowing moisture to enter. These problems cause traditional temperature sensors to frequently experience short circuits and data transmission interruptions due to water leakage in extreme environments such as underwater and high humidity, seriously affecting the normal operation and service life of the sensor. Utility Model Content

[0005] The purpose of this invention is to provide a waterproof temperature sensor to solve the problem that existing waterproof temperature sensors mentioned in the background art have many defects in the waterproof design at the signal transmission line connection.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a waterproof temperature sensor, comprising a waterproof lower shell, wherein a sensor body is disposed inside the waterproof lower shell, and a waterproof upper shell is disposed above the waterproof lower shell to cooperate with it;

[0007] A tapered waterproof connector is vertically installed in the middle of the upper surface of the waterproof upper shell. A sealing plug is nested inside the tapered waterproof connector. A wire hole is precisely machined in the middle of the sealing plug. The inner wall of the wire hole is specially treated to form a tight seal with the signal transmission line passing through it. A fastening nut is threaded to the outer surface of the tapered waterproof connector, which can apply axial pressure to the sealing plug, causing the sealing plug to undergo elastic deformation, further enhancing the sealing effect between the sealing plug and the signal transmission line, and ensuring that the connection between the signal transmission line and the waterproof upper shell has excellent waterproof performance.

[0008] Furthermore, a temperature sensing probe is provided extending from the bottom of the sensor body, and the sensing end of the temperature sensing probe extends out of the waterproof lower shell to sense the external temperature. A mounting hole is fixedly provided in the middle of the bottom of the waterproof lower shell.

[0009] Furthermore, a sealing sleeve is tightly fitted inside the mounting hole. The sealing sleeve is made of a highly elastic and aging-resistant sealing material, and its outer wall is tightly fixed to the inner wall of the mounting hole through an interference fit.

[0010] Furthermore, the temperature sensing probe is located inside the sealing sleeve, and the inner wall is tightly fitted with the outer wall of the temperature sensing probe to form a reliable waterproof sealing barrier, effectively preventing moisture from entering from the connection between the temperature sensing probe and the waterproof lower shell.

[0011] Furthermore, an annular sealing groove is provided around the upper surface of the waterproof lower shell, and a waterproof sealing ring is installed at the bottom of the waterproof upper shell, with the waterproof sealing ring and the annular sealing groove being precisely matched in size.

[0012] Furthermore, when the waterproof upper shell and the waterproof lower shell are fastened together, the waterproof sealing ring is tightly embedded in the annular sealing groove, forming multiple sealing defenses. The bottom of the outer surface of the waterproof upper shell is fitted with an upper shell connecting piece, and the top of the outer surface of the waterproof lower shell is fitted with a lower shell connecting piece.

[0013] Furthermore, the lower shell connecting piece and the upper shell connecting piece are securely connected by bolts or snaps, further enhancing the overall sealing and structural strength of the shell. The outer surfaces of both the waterproof upper shell and the waterproof lower shell are coated with a waterproof coating. The waterproof coating is made of nano-level waterproof material and has excellent hydrophobic and anti-permeability properties, which can resist the erosion of various harsh environments, further improving the waterproof and protective capabilities of the waterproof shell.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. This waterproof temperature sensor achieves dynamic sealing at the signal transmission line connection through a combination structure of a conical waterproof connector, a sealing plug, and a fastening nut. The axial pressure generated when the fastening nut is tightened causes the sealing plug to elastically deform and tightly wrap the signal transmission line. Compared with the traditional fixed sealing structure, it can adapt to different specifications of cables and maintain the sealing effect for a long time, effectively preventing the risk of water leakage caused by cable shaking and thermal expansion and contraction, and ensuring that the sensor can stably transmit temperature data in extreme environments such as underwater and high humidity.

[0016] 2. This waterproof temperature sensor constructs a double-layer waterproof barrier through the interference fit between the sealing sleeve and the mounting hole, as well as the tight fit between the sealing sleeve and the temperature sensing probe. The highly elastic and aging-resistant sealing sleeve not only prevents moisture from penetrating along the gap between the probe and the housing, but also buffers external impacts, preventing the temperature sensing probe from being damaged by mechanical vibration. Compared with the conventional single-seal structure, it significantly improves the reliability of the sensor in vibration environments and ensures the accuracy and stability of temperature measurement.

[0017] 3. This waterproof temperature sensor, through the precise matching of the annular sealing groove and the waterproof sealing ring, and the bolt / clip fixing of the upper shell connecting piece and the lower shell connecting piece, forms a multi-level composite waterproof system. The waterproof coating further strengthens the protection of the shell surface, enabling the sensor to have an IP68 waterproof rating, which can withstand long-term immersion and high-pressure water spray environment. At the same time, the reinforced structure of the connecting piece enhances the overall strength of the shell, preventing the seal from failing due to water pressure or external extrusion. Compared with the existing technology, it significantly extends the service life of the sensor in complex and harsh environments. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a three-dimensional structural diagram of the waterproof lower shell of this utility model;

[0020] Figure 3 This is a three-dimensional structural diagram of the waterproof upper shell of this utility model;

[0021] Figure 4 This is a three-dimensional structural diagram of the temperature sensing probe of this utility model;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the waterproof coating of this utility model.

[0023] In the diagram: 1. Waterproof lower shell; 2. Sensor body; 3. Waterproof upper shell; 4. Conical waterproof connector; 5. Sealing plug; 6. Wiring hole; 7. Fastening nut; 8. Temperature sensing probe; 9. Mounting hole; 10. Sealing sleeve; 11. Annular sealing groove; 12. Waterproof sealing ring; 13. Upper shell connecting piece; 14. Lower shell connecting piece; 15. Waterproof coating. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1 - Figure 5 The present invention provides a technical solution: a waterproof temperature sensor, including a waterproof lower shell 1, a sensor body 2 disposed inside the waterproof lower shell 1, and a waterproof upper shell 3 disposed above the waterproof lower shell 1 to cooperate with it;

[0026] A tapered waterproof connector 4 is vertically arranged in the middle of the upper surface of the waterproof upper shell 3. A sealing plug 5 is nested inside the tapered waterproof connector 4. A wire hole 6 is precisely machined in the middle of the sealing plug 5. The inner wall of the wire hole 6 is specially treated to form a tight seal with the signal transmission line passing through it. A fastening nut 7 is threadedly connected to the outer surface of the tapered waterproof connector 4, which can apply axial pressure to the sealing plug 5, causing the sealing plug 5 to undergo elastic deformation, further enhancing the sealing effect between it and the signal transmission line, and ensuring that the connection between the signal transmission line and the waterproof upper shell 3 has excellent waterproof performance.

[0027] Inside the tapered waterproof connector 4, the wire hole 6 in the middle of the sealing plug 5 tightly wraps the signal transmission line. When the fastening nut 7 is tightened, the sealing plug 5 is subjected to axial pressure and undergoes elastic deformation, which further enhances the wrapping force on the signal transmission line, forming a dynamic seal and ensuring that external moisture cannot seep into the sensor from this connection point during signal transmission.

[0028] A temperature sensing probe 8 extends from the bottom of the sensor body 2. The sensing end of the temperature sensing probe 8 protrudes from the waterproof lower shell 1 to sense the external temperature. A mounting hole 9 is fixedly provided in the middle of the bottom of the waterproof lower shell 1. A sealing sleeve 10 is tightly fitted inside the mounting hole 9. The sealing sleeve 10 is made of a highly elastic and aging-resistant sealing material. Its outer wall is tightly fixed to the inner wall of the mounting hole 9 through an interference fit. The temperature sensing probe 8 is located inside the sealing sleeve 10, and its inner wall is tightly fitted to the outer wall of the temperature sensing probe 8, forming a reliable waterproof sealing barrier, effectively preventing moisture from entering from the connection between the temperature sensing probe 8 and the waterproof lower shell 1. An annular sealing groove 11 is provided around the upper surface of the waterproof lower shell 1, and a waterproof sealing ring 12 is correspondingly installed at the bottom of the waterproof upper shell 3. The waterproof sealing ring 12 and the annular sealing groove 11 are precisely matched in size. When the waterproof upper shell 3 and the waterproof lower shell 1 are fastened together, the waterproof sealing ring 12 is tightly embedded in the annular sealing groove 11, forming multiple sealing defenses. The bottom of the outer surface of the waterproof upper shell 3 is fitted with an upper shell connecting piece 13, and the top of the outer surface of the waterproof lower shell 1 is fitted with a lower shell connecting piece 14. The lower shell connecting piece 14 and the upper shell connecting piece 13 are securely connected by bolts or snaps, further enhancing the overall sealing performance and structural strength of the shell. The outer surfaces of both the waterproof upper shell 3 and the waterproof lower shell 1 are coated with a waterproof coating 15. The waterproof coating 15 is made of nano-level waterproof material and has excellent hydrophobic and anti-permeability properties, which can resist the erosion of various harsh environments and further improve the waterproof and protective capabilities of the waterproof shell.

[0029] During operation, the temperature sensing probe 8, as the core component for sensing external temperature, directly contacts the external medium at its sensing end when in the working environment. Because the temperature sensing probe 8 uses high-precision temperature-sensing materials (such as platinum resistance thermometers), it generates corresponding resistance changes according to changes in external temperature. This resistance signal is transmitted to the sensor body 2 through internal circuitry. The sensor body 2 integrates a signal processing circuit that amplifies, filters, and converts the weak resistance signal from the temperature sensing probe 8 into a standard electrical signal (such as voltage or current signal) for subsequent transmission and processing. The processed electrical signal is transmitted through a signal transmission line that passes through the tapered waterproof connector 4 on the waterproof upper shell 3. For the overall waterproof structure of the sensor, the waterproof lower shell 1 and the waterproof upper shell 3 achieve a seal through precise fitting. When fastened, the waterproof sealing ring 12 at the bottom of the waterproof upper shell 3 is embedded in the annular sealing groove 11 on the upper surface of the waterproof lower shell 1, using the elastic deformation of the waterproof sealing ring 12 to fill the gap between them. Multiple sealing lines are formed. At the same time, the upper shell connecting piece 13 and the lower shell connecting piece 14 are connected by bolts or buckles, which not only enhances the overall structural strength of the shell, but also further compresses the waterproof sealing ring 12 to improve the sealing effect. In addition, the nano-level waterproof coating 15 coated on the outer surface of the waterproof shell has superhydrophobic properties, which can effectively prevent water from adhering and penetrating. Even if the shell surface comes into contact with water, the water will form water droplets on the surface and slide off, further ensuring a dry environment inside the sensor. At the connection between the temperature sensing probe 8 and the waterproof lower shell 1, the sealing sleeve 10 plays a key waterproof role. The outer wall of the sealing sleeve 10 is tightly fixed to the inner wall of the mounting hole 9 by interference fit, and the inner wall is tightly fitted to the outer wall of the temperature sensing probe 8, forming a reliable waterproof sealing barrier to prevent water from entering from the part of the temperature sensing probe 8 that extends out of the waterproof lower shell 1. This ensures that the sensor body 2 can still stably and accurately acquire external temperature data in harsh environments such as humidity and underwater, and safely transmit the processed signal to external devices for display or further analysis.

[0030] Working Principle: During operation, the temperature sensing probe 8, as the core component for sensing external temperature, directly contacts the external medium at its sensing end when in the working environment. Because the temperature sensing probe 8 uses high-precision temperature-sensing materials (such as platinum resistance thermometers), it generates corresponding resistance changes according to changes in external temperature. This resistance signal is transmitted to the sensor body 2 through internal circuitry. The sensor body 2 integrates a signal processing circuit that amplifies, filters, and converts the weak resistance signal from the temperature sensing probe 8 into standard electrical signals (such as voltage and current signals) for subsequent transmission. The processed electrical signal is transmitted via a signal transmission line, which passes through a tapered waterproof connector 4 on the waterproof upper shell 3. Inside the tapered waterproof connector 4, the wire hole 6 in the center of the sealing plug 5 tightly wraps around the signal transmission line. When the fastening nut 7 is tightened, the sealing plug 5 undergoes elastic deformation under axial pressure, further enhancing the wrapping force on the signal transmission line and forming a dynamic seal. This ensures that external moisture cannot seep into the sensor from this connection point during signal transmission. For the overall waterproof structure of the sensor, the waterproof lower shell 1 and the waterproof upper shell 3 achieve a seal through precise fitting. When the waterproof sealing ring 12 at the bottom of the waterproof upper shell 3 is inserted into the annular sealing groove 11 on the upper surface of the waterproof lower shell 1, the elastic deformation of the waterproof sealing ring 12 fills the gap between the two, forming multiple sealing lines. At the same time, the upper shell connecting piece 13 and the lower shell connecting piece 14 are connected by bolts or clips, which not only enhances the overall structural strength of the shell, but also further compresses the waterproof sealing ring 12, improving the sealing effect. In addition, the nano-level waterproof coating 15 coated on the outer surface of the waterproof shell has superhydrophobic properties, which can effectively prevent water from adhering and penetrating. Even if the surface of the shell comes into contact with water, the water will form on the surface. Water droplets slide off, further ensuring a dry environment inside the sensor. At the connection between the temperature sensing probe 8 and the waterproof lower shell 1, the sealing sleeve 10 plays a crucial waterproof role. The outer wall of the sealing sleeve 10 is tightly fixed to the inner wall of the mounting hole 9 through an interference fit, and the inner wall is tightly fitted to the outer wall of the temperature sensing probe 8, forming a reliable waterproof sealing barrier. This prevents moisture from entering from the part of the temperature sensing probe 8 that extends out of the waterproof lower shell 1, ensuring that the sensor body 2 can still stably and accurately acquire external temperature data in harsh environments such as humidity and underwater, and safely transmit the processed signal to external devices for display or further analysis.

[0031] Finally, it should be noted that the above content is only used to illustrate the technical solution of this utility model, and is not intended to limit the scope of protection of this utility model. Simple modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model do not depart from the essence and scope of the technical solution of this utility model.

Claims

1. A waterproof temperature sensor, comprising a waterproof lower housing (1), characterized in that: The sensor body (2) is provided inside the waterproof lower shell (1), and a waterproof upper shell (3) is provided above the waterproof lower shell (1) to cooperate with it. A tapered waterproof connector (4) is vertically arranged in the middle of the upper surface of the waterproof upper shell (3). A sealing plug (5) is nested inside the tapered waterproof connector (4). A wire hole (6) is precisely machined in the middle of the sealing plug (5). The inner wall of the wire hole (6) is specially treated to form a tight seal with the signal transmission line passing through it. A fastening nut (7) is threaded to the outer surface of the tapered waterproof connector (4), which can apply axial pressure to the sealing plug (5) to make the sealing plug (5) elastically deform, further strengthening the sealing effect between it and the signal transmission line, and ensuring that the connection between the signal transmission line and the waterproof upper shell (3) has excellent waterproof performance.

2. The waterproof temperature sensor according to claim 1, characterized in that: The sensor body (2) extends to the bottom end and a temperature sensing probe (8) is provided. The sensing end of the temperature sensing probe (8) extends out of the waterproof lower shell (1) to sense the external temperature. The waterproof lower shell (1) has a mounting hole (9) fixedly provided in the middle of the bottom end.

3. A waterproof temperature sensor according to claim 2, characterized in that: The mounting hole (9) is tightly fitted with a sealing sleeve (10), which is made of a highly elastic and aging-resistant sealing material. Its outer wall is tightly fixed to the inner wall of the mounting hole (9) through an interference fit.

4. A waterproof temperature sensor according to claim 2, characterized in that: The temperature sensing probe (8) is located inside the sealing sleeve (10), and the inner wall is tightly fitted with the outer wall of the temperature sensing probe (8) to form a reliable waterproof sealing barrier, effectively preventing moisture from entering from the connection between the temperature sensing probe (8) and the waterproof lower shell (1).

5. A waterproof temperature sensor according to claim 1, characterized in that: The waterproof lower shell (1) is surrounded by an annular sealing groove (11), and the waterproof upper shell (3) is fitted with a waterproof sealing ring (12) at the bottom. The waterproof sealing ring (12) and the annular sealing groove (11) are precisely matched in size.

6. A waterproof temperature sensor according to claim 1, characterized in that: When the waterproof upper shell (3) and the waterproof lower shell (1) are fastened together, the waterproof sealing ring (12) is tightly embedded in the annular sealing groove (11) to form multiple sealing defenses. The bottom of the outer surface of the waterproof upper shell (3) is fitted with an upper shell connecting piece (13), and the top of the outer surface of the waterproof lower shell (1) is fitted with a lower shell connecting piece (14).

7. A waterproof temperature sensor according to claim 6, characterized in that: The lower shell connecting piece (14) and the upper shell connecting piece (13) are securely connected by bolts or snaps, further enhancing the overall sealing and structural strength of the shell. The outer surfaces of the waterproof upper shell (3) and the waterproof lower shell (1) are coated with a waterproof coating (15). The waterproof coating (15) is made of nano-level waterproof material, which has excellent hydrophobic and anti-permeability properties and can resist the erosion of various harsh environments, further improving the waterproof and protective capabilities of the waterproof shell.

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