A sealing structure of a thermistor temperature sensor base

Abstract

This utility model relates to the field of resistance temperature detectors (RTDs), and more particularly to a sealing structure for an RTD temperature sensor base. It includes a ball-and-box assembly, with a fixed base at its bottom. A valve stem assembly is housed within the fixed base, and a sensor is disposed within the valve stem assembly. The sensor passes through both the valve stem assembly and the fixed base, with its top end located within the ball-and-box assembly. This utility model addresses the problem of poor sealing between the outer diameter of the valve stem and the inner diameter of the base by adding a third and a fourth sealing ring to the valve stem. This improvement significantly enhances the sealing performance between the valve stem and the fixed base, effectively preventing media leakage and achieving a 98% pass rate, thus significantly improving product quality and reliability.

Description

Technical Field

[0001] This utility model relates to the field of resistance temperature detectors (RTDs), and more particularly to a sealing structure for a RTD temperature sensor base. Background Technology

[0002] In the field of temperature detection technology, resistance temperature detectors (RTDs) are widely used in various industrial production scenarios and scientific research experiments to accurately measure the temperature of the environment or objects. For RTDs, the sealing structure of their base is crucial, as its sealing performance directly affects the sensor's measurement accuracy, lifespan, and the safety of its application.

[0003] Existing sealing structures for RTD temperature sensor bases have several problems. For example, the current connection between the lower inner hole of the ball housing and the sensor base uses an inner and outer circular sealing diagram. This connection method suffers from poor sealing, allowing external moisture, dust, and other impurities to easily enter the sensor, affecting its normal operation, reducing measurement accuracy, and even damaging the sensor. Furthermore, poor positioning between the base's outer diameter and the ball housing's inner hole not only affects the stability of the entire sensor structure but may also cause the seal to shift or twist during installation, further weakening the sealing effect. In addition, the poor sealing effect at the connection between the valve stem's outer diameter and the inner diameter of the fixed base component allows the medium to leak from the connection point, polluting the measurement environment and potentially affecting the sensor's performance and lifespan. Utility Model Content

[0004] The purpose of this invention is to provide a sealing structure for a resistance temperature sensor base to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution, which includes a ball box assembly, a fixed base component at the bottom of the ball box assembly, a valve stem assembly inside the fixed base component, a sensor inside the valve stem assembly, the sensor passing through the valve stem assembly and the fixed base component respectively, and its top end located inside the ball box assembly.

[0006] As a preferred embodiment of this utility model, the ball box assembly includes a ball box body, a ball cover on the ball box body, a connecting pipe at the rear of the ball box body, an mounting block on the connecting pipe, a pair of connecting blocks at the rear of the ball cover, the two connecting blocks and the mounting block being movably connected by a rotating shaft, a sealing ring at the bottom of the ball cover, a triangular mating plate at the front of the ball cover, a triangular mating plate at the corresponding position on the ball box body, a fixing bolt threaded on the triangular mating plate, a connecting seat at the bottom of the ball box body, and a fixing base threaded inside the connecting seat.

[0007] As a preferred embodiment of this utility model, the fixed base component includes a screwing component, the bottom of the screwing component is provided with an external threaded bottom block, the top of the screwing component is provided with an external threaded cylinder, the external threaded cylinder is threaded in the connecting seat, and the inner top surface of the external threaded cylinder is provided with a mating screw.

[0008] As a preferred embodiment of this utility model, a second sealing ring is provided on the top of the screwing component, and the second sealing ring abuts against the inner wall of the connecting seat.

[0009] As a preferred embodiment of this utility model, the valve stem assembly includes a valve stem body, a mating nut is provided on the top of the valve stem body, the mating nut is threaded on the mating screw, and a sealing ring three and a sealing ring four are respectively provided on the outer wall of the valve stem body, and the sealing ring three and the sealing ring four abut against the inner wall of the fixed base component.

[0010] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0011] This invention addresses the problem of poor sealing between the outer diameter of the valve stem and the inner diameter of the base by adding sealing ring three and sealing ring four to the valve stem. This improvement greatly enhances the sealing performance between the valve stem and the fixed base, effectively preventing media leakage and achieving a pass rate of 98%, thus significantly improving product quality and reliability.

[0012] This invention addresses the problem of poor positioning between the outer diameter of the fixed base and the connecting seat by adjusting the length of the thread and the fitting accuracy. This effectively solves the positioning problem, allowing the fixed base to be accurately and stably installed in the connecting seat, enhancing the stability of the entire sensor structure and avoiding problems such as sealing failure caused by inaccurate positioning.

[0013] This invention increases friction by optimizing the fit precision of internal and external threads, thereby achieving a better sealing effect. Compared with traditional sealing connections, this thread-fit-based sealing method has more reliable sealing performance and can effectively prevent external impurities from entering the sensor, ensuring that the sensor can work stably and accurately in various complex environments.

[0014] The structural design of this utility model prevents the valve stem from shaking arbitrarily. In actual use, operators do not need to frequently adjust and fix the sensor, reducing operation steps and maintenance costs, improving work efficiency, and making it more convenient to use. This provides a better user experience for industrial production and scientific research applications, while also improving the economic benefits of enterprises. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the present invention when the ball cover is opened;

[0017] Figure 3 This is an overall side sectional view of the present invention;

[0018] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0019] Figure 5 This is a schematic diagram of the fixed base component of this utility model.

[0020] Figure 6 This is a schematic diagram of the valve stem assembly structure of this utility model.

[0021] Reference numerals: 1. Ball box assembly; 10. Ball box body; 11. Connecting pipe; 12. Mounting block; 13. Ball cover; 14. Connecting block; 15. Rotating shaft; 16. Sealing ring one; 17. Triangular mating plate one; 18. Triangular mating plate two; 19. Fixing bolt; 110. Connecting seat; 2. Fixing base component; 20. Tightening component; 21. External threaded cylinder; 22. External threaded bottom block; 23. Butt screw; 24. Sealing ring two; 30. Valve stem assembly; 31. Valve stem body; 32. Butt nut; 33. Sealing ring three; 34. Sealing ring four; 4. Sensor. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0023] like Figure 1-6 As shown, the present invention proposes a sealing structure for a thermal resistance temperature sensor base, which includes a ball box assembly 1, a fixed base component 2 at the bottom of the ball box assembly 1, a valve stem assembly 3 inside the fixed base component 2, a sensor 4 inside the valve stem assembly 3, and the sensor 4 passing through the valve stem assembly 3 and the fixed base component 2 respectively, with its top end located inside the ball box assembly 1.

[0024] The ball box assembly 1 serves as the upper protective structure of the sensor 4. Its main body includes the ball box body 10 and the ball cover 13. The connecting pipe 11 at the tail of the ball cover 13 is movably connected to the mounting block 12 at the tail of the ball box body 10 through a pair of connecting blocks 14 (the rotating shaft 15 passes through the connecting block 14 and the mounting block 12 to achieve rotation). It can be flexibly opened and closed to facilitate the inspection or replacement of internal components.

[0025] The sealing between the ball cover 13 and the ball box body 10 is achieved in the following way: a sealing ring 16 is provided at the bottom of the ball cover 13. When the ball cover 13 is closed, the sealing ring 16 is tightly fitted with the corresponding surface of the ball box body 10. At the same time, the triangular mating plate 17 on the front of the ball cover 13 is aligned with the triangular mating plate 18 on the ball box body 10. By tightening the fixing bolts 19 on the triangular mating plate 17, the two are tightly pressed together, further enhancing the sealing performance between the ball cover 13 and the ball box body 10.

[0026] The ball box body 10 has a connecting seat 110 at the bottom. The inner wall of the connecting seat 110 has an internal thread for threaded connection with the fixed base 2, providing an installation base for the lower structure of the sensor 4.

[0027] The fixed base component 2 is a key component connecting the ball box assembly 1 and the valve stem assembly 3. Its top external threaded cylinder 21 matches the internal thread of the bottom connecting seat 110 of the ball box assembly 1, and the two are fixedly connected by thread engagement.

[0028] To improve the sealing performance and positioning accuracy between the fixed base component 2 and the connecting seat 110: the top of the screwing component 20 is provided with a second sealing ring 24. When the external threaded cylinder 21 is screwed into the connecting seat 110, the second sealing ring 24 tightly abuts against the inner wall of the connecting seat 110, forming the first seal. At the same time, by adjusting the length and fitting accuracy of the internal threads of the external threaded cylinder 21 and the connecting seat 110, the outer diameter of the fixed base component 2 is accurately positioned with the inner hole of the connecting seat 110, avoiding shaking or displacement.

[0029] The inner top surface of the external threaded cylinder 21 of the fixed base component 2 is provided with a mating screw 23 for mating and fixing with the valve stem assembly 3;

[0030] The valve stem assembly 3 is the core support structure of the sensor 4. The mating nut 31 on its top is threadedly connected to the mating screw 23 inside the fixed base 2. By tightening the mating nut 31, the valve stem body 30 is firmly fixed inside the fixed base 2. The sealing between the valve stem body 30 and the inner wall of the fixed base 2 is achieved through double sealing: sealing ring 32 and sealing ring 4 33 are sequentially provided on the outer wall of the valve stem body 30. When the valve stem assembly 3 is installed in place, sealing ring 32 and sealing ring 4 33 are tightly fitted to the inner wall of the fixed base 2, effectively blocking the path of medium leakage from the gap between the two, and solving the problem of poor sealing between the valve stem and the inner diameter of the base in the traditional structure.

[0031] The sensor's detection part passes sequentially through the internal channel of the valve stem assembly 3 and the central hole of the fixed base 2, with its top extending into the ball box assembly 1 to detect the temperature of the target environment. The sensor 4 and the valve stem assembly 3 and the fixed base 2 are indirectly sealed and protected by the above-mentioned sealing structure to ensure the stability of the measurement environment.

[0032] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A sealing structure for a base of a resistance temperature sensor, comprising a ball-shaped housing assembly (1), wherein a fixed base component (2) is provided at the bottom of the ball-shaped housing assembly (1), characterized in that: A valve stem assembly (3) is provided inside the fixed base component (2), and a sensor (4) is provided inside the valve stem assembly (3). The sensor (4) passes through the valve stem assembly (3) and the fixed base component (2) respectively, and its top end is located inside the ball box assembly (1).

2. The sealing structure of a resistance temperature sensor base according to claim 1, characterized in that: The ball box assembly (1) includes a ball box body (10), a ball cover (13) is provided on the ball box body (10), a connecting pipe (11) is provided at the tail of the ball box body (10), an installation block (12) is provided on the connecting pipe (11), a pair of connecting blocks (14) are provided at the tail of the ball cover (13), the two connecting blocks (14) and the installation block (12) are movably connected by a rotating shaft (15), a sealing ring (16) is provided at the bottom of the ball cover (13), a triangular mating plate (17) is provided on the front of the ball cover (13), a triangular mating plate (18) is provided on the ball box body (10) at the position corresponding to the triangular mating plate (17), a fixing bolt (19) is threaded on the triangular mating plate (17), a connecting seat (110) is provided at the bottom of the ball box body (10), and the fixing base part (2) is threaded in the connecting seat (110).

3. The sealing structure of a resistance temperature sensor base according to claim 2, characterized in that: The fixed base component (2) includes a screwing component (20), the bottom of the screwing component (20) is provided with an external threaded bottom block (22), the top of the screwing component (20) is provided with an external threaded cylinder (21), the external threaded cylinder (21) is threaded in the connecting seat (110), and the inner top surface of the external threaded cylinder (21) is provided with a mating screw (23).

4. The sealing structure of a resistance temperature sensor base according to claim 3, characterized in that: The top of the screwing component (20) is provided with a sealing ring two (24), which abuts against the inner wall of the connecting seat (110).

5. The sealing structure of a resistance temperature sensor base according to claim 3, characterized in that: The valve stem assembly (3) includes a valve stem body (30), and a mating nut (31) is provided on the top of the valve stem body (30). The mating nut (31) is threaded onto the mating screw (23). A sealing ring three (32) and a sealing ring four (33) are respectively provided on the outer wall of the valve stem body (30). The sealing ring three (32) and the sealing ring four (33) abut against the inner wall of the fixed base component (2).

Images