Quick-response miniaturized thermal resistor

Abstract

The utility model relates to the technical field of thermal resistors, and discloses a quick-response miniaturized thermal resistor, which comprises a junction box, a resistor body is mounted at the bottom of the junction box, a protective tube is sleeved outside the resistor body, a locking bolt is mounted outside the protective tube, a sealing sleeve is fixedly connected to the top end of the protective tube, and the sealing sleeve is fixedly connected to the bottom of the junction box. The sealing sleeve is clamped on the lower side of the exterior of the junction box in a sleeving mode, through grooves are formed in the periphery of the interior of the junction box, springs are fixedly connected to the inner walls of the through grooves, positioning heads are fixedly connected to one ends of the springs, and positioning holes with the same number as the through grooves in position are formed in the four corners of the inner side of the sealing sleeve; the positioning head is slidably connected to the interior of the positioning hole, and a first sealing ring and a second sealing ring are installed in the sealing sleeve and the junction box. According to the utility model, oil is prevented from permeating into the wire core of the thermal resistor, the normal work of the thermal resistor is ensured, and the service life of the thermal resistor is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of resistance temperature detectors (RTDs), and in particular to a miniaturized RTD with fast response. Background Technology

[0002] Miniaturized resistance temperature detectors (RTDs) are small thermistors used for temperature measurement, widely applied in applications requiring rapid response and accurate temperature measurement. They are primarily composed of resistance material, and their resistance changes with temperature.

[0003] The working principle of miniaturized resistance temperature detectors (RTDs) is based on the property of resistance changing with temperature. When the temperature changes, the resistance value of the RTD changes accordingly. Its basic principle utilizes the linear or non-linear change in resistance of metallic or semiconductor materials with temperature. Common RTD materials include platinum (Pt), nickel (Ni), and copper (Cu). In miniaturized RTDs, the sensor size is reduced, resulting in a faster response time, making them suitable for precise temperature monitoring and rapid response environments. By measuring the change in resistance, the actual temperature value can be calculated. However, in ordinary RTDs, poor cable connection processes can lead to oil seeping into the RTD wire core over time, affecting the RTD's lifespan and causing it to malfunction. Therefore, a fast-response miniaturized RTD is proposed to solve these problems. Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a miniaturized thermal resistor with fast response, aiming to improve the problem in the prior art where poor connection process between ordinary thermal resistors and cables leads to oil seeping into the thermal resistor core after prolonged use, affecting the service life of the thermal resistor and preventing it from working properly.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a fast-response miniaturized thermal resistor, comprising a junction box, a resistor being installed at the bottom of the junction box, a protective tube being sleeved around the resistor being sleeved around the resistor being sleeved around the outside of the protective tube being sleeved around the outside of the protective tube being sleeved around the bottom of the junction box being sleeved around the outside of the junction box being sleeved around the bottom ...

[0006] As a further description of the above technical solution:

[0007] The protective tube is fitted with a stainless steel shell, and an insulating layer is fixedly connected to the inside of the stainless steel shell. The cavity between the insulating layer and the resistor is filled with a high-temperature resistant layer. A silicone layer is fixedly connected to the inside of the protective tube, and the silicone layer is snapped onto the outside of the stainless steel shell.

[0008] As a further description of the above technical solution:

[0009] Both the sealing sleeve and the junction box are equipped with sealing ring one and sealing ring two, which are installed on the upper and lower sides of the positioning head.

[0010] As a further description of the above technical solution:

[0011] The positioning head is slidably connected inside the through groove.

[0012] As a further description of the above technical solution:

[0013] The engaging connection between the sealing sleeve and sealing rings one and two increases the stability of the installation of the sealing sleeve and the junction box.

[0014] As a further description of the above technical solution:

[0015] The high-temperature resistant layer is made of magnesium oxide powder, which improves the heat resistance of the resistive element.

[0016] As a further description of the above technical solution:

[0017] The insulating layer is made of rubber.

[0018] This utility model has the following beneficial effects:

[0019] In this invention, the protective tube and sealing sleeve are fitted over the outside of the resistor body to the bottom of the junction box. When the sealing sleeve is fitted over the outside of the junction box, the positioning head is compressed and simultaneously compressed to the spring, causing it to store force and generate a rebound force. After installation, the positioning head is inserted into the positioning hole under the rebound force of the spring, thereby positioning and installing the sealing sleeve, ensuring the sealing of the resistor body, and further preventing oil penetration through the sealing rings one and two, and ensuring the firm connection between the sealing sleeve and the junction box, thus preventing oil from entering the wire core of the thermal resistor.

[0020] In this invention, a high-temperature resistant layer made of magnesium oxide powder and an insulating layer made of rubber are provided between the resistor and the stainless steel shell, giving it high heat resistance, shock resistance and good insulation. The silicone layer inside the protective tube further enhances the shock resistance. The stainless steel shell and the protective tube are firmly fixed to the outside of the resistor by the secure installation between the sealing sleeve and the junction box, achieving double protection. Attached Figure Description

[0021] Figure 1 A front-view perspective view of a miniaturized thermal resistor with fast response proposed in this utility model;

[0022] Figure 2 A cross-sectional view of a fast-response miniaturized thermal resistor proposed in this utility model;

[0023] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 A cross-sectional view of the sealing sleeve of a miniaturized thermal resistor with fast response proposed in this utility model;

[0025] Figure 5 for Figure 4 Enlarged view of section B in the middle.

[0026] Legend:

[0027] 1. Junction box; 2. Protective tube; 3. Silicone layer; 4. Stainless steel shell; 5. Insulation layer; 6. High temperature resistant layer; 7. Resistor; 8. Sealing sleeve; 9. Sealing ring one; 10. Sealing ring two; 11. Through groove; 12. Spring; 13. Positioning head; 14. Positioning hole; 15. Locking bolt. Detailed Implementation

[0028] 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.

[0029] Reference Figure 1 , Figure 4 , Figure 5 An embodiment of this utility model provides a fast-response miniaturized thermal resistor, including a junction box 1, a resistor 7 installed at the bottom of the junction box 1, a protective tube 2 sleeved on the outside of the resistor 7, a locking bolt 15 installed on the outside of the protective tube 2, a sealing sleeve 8 fixedly connected to the top of the protective tube 2, the sealing sleeve 8 being clamped on the lower outside of the junction box 1, through grooves 11 being opened on all four sides of the inside of the junction box 1, a spring 12 being fixedly connected to the inner wall of the through groove 11, a positioning head 13 being fixedly connected to one end of the spring 12, positioning holes 14 being opened at the four corners of the inner side of the sealing sleeve 8 in the same number as the positions of the through grooves 11, the positioning head 13 being slidably connected to the inside of the positioning holes 14, and the positioning head 13 being slidably connected to the inside of the through grooves 11;

[0030] Both the sealing sleeve 8 and the junction box 1 are equipped with sealing ring 1 9 and sealing ring 2 10. Sealing ring 1 9 and sealing ring 2 10 are installed on the upper and lower sides of the positioning head 13. The engaging connection between the sealing sleeve 8 and sealing ring 2 10 and sealing ring 1 9 increases the firmness of the installation of the sealing sleeve 8 and the junction box 1.

[0031] By clamping the protective tube 2 and the sealing sleeve 8 onto the outside of the resistor 7 and the lower side of the junction box 1, when the sealing sleeve 8 is clamped on the outside of the junction box 1, the positioning head 13 is squeezed and simultaneously squeezes the spring 12, causing it to store force and generate a rebound force. After the sealing sleeve 8 is installed, the positioning head 13 is pushed into the positioning hole 14 under the rebound force of the spring 12, positioning and installing the sealing sleeve 8, protecting and sealing the resistor 7. Under the action of the sealing ring 1 9 and the sealing ring 2 10, oil penetration is further prevented. Under the action of the sealing ring 1 9 and the sealing ring 2 10 clamped inside the sealing sleeve 8, the connection between the sealing sleeve 8 and the junction box 1 is further ensured, thus preventing oil from penetrating into the core of the thermal resistor, ensuring the normal operation of the thermal resistor, and increasing the service life of the thermal resistor.

[0032] Reference Figures 1-3 The protective tube 2 is fitted with a stainless steel shell 4. An insulating layer 5 is fixedly connected to the inside of the stainless steel shell 4. The cavity between the insulating layer 5 and the resistor 7 is filled with a high-temperature resistant layer 6. A silicone layer 3 is fixedly connected to the inside of the protective tube 2. The silicone layer 3 is snapped onto the outside of the stainless steel shell 4. The high-temperature resistant layer 6 is made of magnesium oxide powder to improve the heat resistance of the resistor 7. The insulating layer 5 is made of rubber.

[0033] The resistor 7 possesses high heat resistance and shock resistance, as well as good insulation capabilities, through a high-temperature resistant layer 6 made of magnesium oxide powder and an insulating layer 5 made of rubber. The silicone layer 3 inside the protective tube 2 further protects the resistor 7 from shock. The stainless steel shell 4 and the protective tube 2 are firmly installed on the outside of the resistor 7 through the secure installation between the sealing sleeve 8 and the junction box 1, providing double protection. Through multiple protection measures, the stability and safety of the resistor 7 in harsh environments such as high temperature and vibration are ensured, while improving its service life and reliability.

[0034] Working principle: When the device is needed, the protective tube 2 and the sealing sleeve 8 are clamped onto the outside of the resistor 7 to the lower side of the junction box 1. When the sealing sleeve 8 is clamped on the outside of the junction box 1, the positioning head 13 is squeezed and simultaneously squeezes the spring 12, causing it to store force and generate a rebound force. After installation, the positioning head 13 is inserted into the positioning hole 14 under the rebound force of the spring 12, thereby positioning and installing the sealing sleeve 8, ensuring the sealing of the resistor 7, and further preventing oil penetration through the sealing ring 9 and sealing ring 10, and ensuring the firm connection between the sealing sleeve 8 and the junction box 1, preventing oil from entering the wire core of the thermal resistor; the high-temperature resistant layer 6 made of magnesium oxide powder and the insulating layer 5 made of rubber set between the resistor 7 and the stainless steel shell 4 give it high heat resistance, shock resistance and good insulation ability. The silicone layer 3 inside the protective tube 2 further enhances the shock resistance effect. Through the firm installation between the sealing sleeve 8 and the junction box 1, the stainless steel shell 4 and the protective tube 2 can be firmly fixed to the outside of the resistor 7, achieving double protection.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fast-response miniaturized thermal resistor, comprising a junction box (1), characterized in that: A resistor (7) is installed at the bottom of the junction box (1). A protective tube (2) is sleeved on the outside of the resistor (7). A locking bolt (15) is installed on the outside of the protective tube (2). A sealing sleeve (8) is fixedly connected to the top of the protective tube (2). The sealing sleeve (8) is clamped on the lower side of the junction box (1). A through groove (11) is opened on all four sides of the inside of the junction box (1). A spring (12) is fixedly connected to the inner wall of the through groove (11). A positioning head (13) is fixedly connected to one end of the spring (12). Positioning holes (14) with the same number of positions as the through groove (11) are opened at the four corners of the inner side of the sealing sleeve (8). The positioning head (13) is slidably connected inside the positioning hole (14).

2. The miniaturized thermal resistor with fast response according to claim 1, characterized in that: The protective tube (2) is fitted with a stainless steel shell (4), and an insulating layer (5) is fixedly connected to the inside of the stainless steel shell (4). The cavity between the insulating layer (5) and the resistor (7) is filled with a high-temperature resistant layer (6). A silicone layer (3) is fixedly connected to the inside of the protective tube (2), and the silicone layer (3) is snapped onto the outside of the stainless steel shell (4).

3. The miniaturized thermal resistor with fast response according to claim 1, characterized in that: The sealing sleeve (8) and the junction box (1) are both equipped with sealing ring one (9) and sealing ring two (10), which are installed on the upper and lower sides of the positioning head (13).

4. The fast-response miniaturized thermal resistor according to claim 1, characterized in that: The positioning head (13) is slidably connected inside the through groove (11).

5. The fast-response miniaturized thermal resistor according to claim 3, characterized in that: The engaging connection between the sealing sleeve (8) and the sealing rings 2 (10) and 1 (9) increases the stability of the installation of the sealing sleeve (8) and the junction box (1).

6. The fast-response miniaturized thermal resistor according to claim 2, characterized in that: The high-temperature resistant layer (6) is magnesium oxide powder, which improves the heat resistance of the resistive body (7).

7. A fast-response miniaturized thermal resistor according to claim 2, characterized in that: The insulating layer (5) is made of rubber.

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