Thermal resistor elastic protection device

Abstract

The utility model provides a thermal resistor elastic protection device which comprises a junction box, the junction box is provided with an electrical interface and an extension shell, the extension shell is elastically connected with a flow guide shell through a buffer spring, the flow guide shell is fixedly provided with a resistance tube, and the interior of the flow guide shell and the resistance tube form a flow guide channel. A flow guide device is arranged in the flow guide channel of the flow guide shell, the flow guide shell is provided with a flow guide plate and a balance plate, and the resistance tube is connected into the junction box through a sealing insulation wire. During application, fluid impacts on the flow guide plate, impact force is relieved through the buffer spring, the flow guide plate introduces the fluid into the flow guide channel, the fluid passes through the resistance tube in a surrounding mode, it is ensured that the resistance tube can measure the temperature of the fluid in real time, and the measurement precision is improved.

Description

Technical Field

[0001] This utility model belongs to the field of resistance temperature detector (RTD) technology, and specifically relates to an elastic protection device for RTDs. Background Technology

[0002] A resistance temperature detector (RTD) is a sensor that measures temperature by utilizing the property that the resistance of a metallic conductor increases with temperature. It is typically made of pure metals, commonly platinum, copper, and nickel. Platinum RTDs are widely used due to their extremely high measurement accuracy, especially in industrial temperature measurement, and are even used as standard reference instruments. The temperature measurement principle of an RTD is based on the characteristic that the resistance of a conductor or semiconductor changes with temperature. It has important applications in many fields, including industrial control and laboratories. In industrial environments, RTDs can be used to monitor and control temperature; in laboratories, they can be used to measure reaction temperatures in chemical and physical experiments. Furthermore, a flexible protective structure is also an important component of an RTD, effectively protecting its internal components.

[0003] Due to design flaws, the existing elastic protection structure of RTDs blocks the fluid that directly impacts the RTD during use, resulting in a decrease in the accuracy of the RTD measurement.

[0004] Chinese utility model patent CN222438977U discloses an elastic protection device for a resistance temperature detector (RTD), comprising a resistance tube; and further comprising: a fixing ring disposed outside the resistance tube, the fixing ring having a slot inside; four arc-shaped mounting plates disposed outside the fixing ring, arranged in a ring at equal intervals, each arc-shaped mounting plate having a groove inside, each groove having an arc-shaped buffer plate slidingly engaged with the groove, one end of the buffer plate extending outside the arc-shaped mounting plate; and nine springs disposed inside the groove, each spring being fixedly connected to the arc-shaped mounting plate and the arc-shaped buffer plate. This structure solves the problems of elastic protection mechanisms being unable to provide all-around protection and the difficulty in adjusting elastic protection devices. While this device can provide all-around protection for the RTD, the elastic protection structure blocks fluids that directly impact the RTD, leading to a decrease in the accuracy of the RTD measurement. Utility Model Content

[0005] The purpose of this invention is to provide a thermal resistance elastic protection device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a thermal resistor elastic protection device, including a junction box, which has an electrical interface, an extension shell, and a current guide shell elastically connected to the extension shell via a buffer spring. A resistor tube is fixedly installed in the current guide shell, and a current guide channel is formed between the current guide shell and the resistor tube inside the current guide shell. A current guide is provided in the current guide shell and within the current guide channel. The current guide shell has a current guide plate and a balance plate. The resistor tube is connected to the junction box via a sealed insulated wire.

[0007] Preferably, the extended housing is provided with a partition, the partition is provided with an assembly hole, the assembly hole is sealed with a sealing element, the sealing element is provided with a through hole, and the sealing insulation wire passes through the through hole.

[0008] Preferably, the seal and the mounting hole are fitted with an interference fit using adhesive, and the sealing insulation wire is fitted with an interference fit using adhesive to the through hole.

[0009] Preferably, the sealing element is made of heat-resistant silicone.

[0010] Preferably, the extended housing is provided with a first assembly groove, the flow guide housing is provided with a second assembly groove, the first assembly groove is fixedly connected to one end of the buffer spring, and the second assembly groove is fixedly connected to the other end of the buffer spring.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] The junction box of this utility model is provided with an extended housing, which is elastically connected to the flow guide housing through a buffer spring. A resistance tube is fixedly installed in the flow guide housing, and the inside of the flow guide housing and the resistance tube form a flow guide channel. The flow guide housing is provided with a flow guide plate and a balance plate. When in use, the fluid impacts the flow guide plate, and the impact force is relieved by the buffer spring. The flow guide plate introduces the fluid into the flow guide channel, so that the fluid surrounds the resistance tube, ensuring that the resistance tube can measure the temperature of the fluid in real time and improving the measurement accuracy. Attached Figure Description

[0013] Figure 1 This is the first perspective structural view of this utility model.

[0014] Figure 2 This is the second perspective structural view of this utility model.

[0015] Figure 3 This is a cross-sectional structural view of the present invention.

[0016] Figure 4 This is a cross-sectional structural view of the flow guide shell of this utility model.

[0017] Figure 5This is a structural view of the flow guide shell of this utility model.

[0018] The diagram is labeled as follows: Junction box 1, Electrical interface 2, Extension housing 3, Buffer spring 4, Flow guide housing 5, Resistance tube 6, Flow guide channel 7, Flow guide 8, Flow guide plate 9, Balance plate 10, Sealed insulation wire 11, Partition 12, Assembly hole 13, Seal 14, Through hole 15, First assembly slot 16, Second assembly slot 17. Detailed Implementation

[0019] 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.

[0020] Example 1:

[0021] like Figures 1-5 As shown, this utility model provides a thermal resistor elastic protection device, including a junction box 1 with an electrical interface 2. The junction box 1 has an extension housing 3, which is elastically connected to a current-guiding housing 5 via a buffer spring 4. A resistance tube 6 is fixedly installed in the current-guiding housing 5, forming a current-guiding channel 7 with the resistance tube 6 inside the current-guiding housing 5. A current guide 8 is located within the current-guiding channel 7 in the current-guiding housing 5. The current-guiding housing 5 has a current-guiding plate 9 and a balance plate 10. The resistance tube 6 is connected to the junction box 1 via a sealed insulating wire 11. The extension housing 3 has a partition 12 with an assembly hole 13. A sealing element 14 is sealed in the assembly hole 13, and the sealing element 14 has a through hole 15 through which the sealed insulating wire 11 passes. The sealing element 14 and the assembly hole 13 are fitted with an interference fit using adhesive, and the sealed insulating wire 11 and the through hole 15 are also fitted with an interference fit using adhesive. The sealing element 14 is made of heat-resistant silicone. The extension housing 3 is provided with a first assembly groove 16, and the flow guide housing 5 is provided with a second assembly groove 17. The first assembly groove 16 is fixedly connected to one end of the buffer spring 4, and the second assembly groove 17 is fixedly connected to the other end of the buffer spring 4.

[0022] Through the above technical solution, the junction box 1 of this utility model is provided with an extension shell 3. The extension shell 3 is elastically connected to the flow guide shell 5 through a buffer spring 4. The flow guide shell 5 is fixedly installed with a resistance tube 6. The interior of the flow guide shell 5 and the resistance tube 6 form a flow guide channel 7. The flow guide shell 5 is provided with a flow guide plate 9 and a balance plate 10. When in use, the fluid impacts the flow guide plate 9. The impact force is dissipated by the buffer spring 4. The flow guide plate 9 introduces the fluid into the flow guide channel 7, so that the fluid surrounds the resistance tube 6, ensuring that the resistance tube 6 can measure the temperature of the fluid in real time and improve the measurement accuracy.

[0023] Example 2:

[0024] like Figures 1-5 As shown, the junction box 1 of this utility model is provided with an electrical interface 2. One end of the junction box 1 is connected to an extension housing 3, which is elastically connected to a flow guide housing 5 via a buffer spring 4. A resistance tube 6 is fixedly installed inside the flow guide housing 5, forming a flow guide channel 7 between the interior of the flow guide housing 5 and the resistance tube 6. A flow guide 8 is provided inside the flow guide channel 7 to guide fluid flow. A flow guide plate 9 and a balance plate 10 are provided on the exterior of the flow guide housing 5. The flow guide plate 9 is located at the inlet of the flow guide housing 5 and is used for initial diversion and guiding the fluid into the flow guide channel 7. The balance plate 10 is used to balance the force exerted by the fluid on the flow guide plate 9. The resistance tube 6 is connected to the internal circuit of the junction box 1 via a sealed insulating wire 11. In use, the fluid first contacts the flow guide plate 9, which diverts the fluid and guides it into the flow guide channel 7. The fluid entering the flow guide channel 7 flows along a preset path across the surface of the resistance tube 6 under the action of the flow guide 8. This design ensures that the fluid can fully contact the resistance tube 6, improving the accuracy of temperature measurement. Meanwhile, the presence of the buffer spring 4 creates an elastic connection between the flow guide housing 5 and the extension housing 3, effectively absorbing external impact forces and preventing damage to the resistance tube 6. The design of the flow guide channel 7 not only protects the resistance tube 6 but also optimizes the fluid flow path. When the fluid passes through the flow guide channel 7, it can evenly surround the resistance tube 6, avoiding the influence of local flow velocity differences on measurement accuracy. The presence of the flow guide 8 further improves the fluid flow state, making the fluid form a more uniform flow layer around the resistance tube 6. The balance plate 10 is located on the opposite side of the flow guide plate 9, and its function is to balance the force of the fluid on the flow guide plate 9. The sealed insulating wire 11 connects the resistance tube 6 and the internal circuit of the junction box 1, providing not only a reliable electrical connection but also ensuring the sealing of the device and preventing the circuit from being short-circuited by the fluid. This utility model effectively reduces the fluid impact force and optimizes the fluid flow path through structural design and component configuration, improving the accuracy and stability of temperature measurement. The synergistic effect of components such as the buffer spring 4, flow guide plate 9, flow guide channel 7, and flow guide 8 protects the resistance tube 6 from direct impact.

[0025] Example 3:

[0026] like Figures 1-5As shown, the extension shell 3 and the flow guide shell 5 of this utility model are elastically connected by a buffer spring 4. The extension shell 3 is provided with a first mounting groove 16, and the flow guide shell 5 is provided with a second mounting groove 17. One end of the buffer spring 4 is fixed in the first mounting groove 16, and the other end is fixed in the second mounting groove 17, thereby connecting the extension shell 3 and the flow guide shell 5 together. During assembly, firstly, one end of the buffer spring 4 is inserted into the first mounting groove 16 of the extension shell 3 and ensured to be firmly fixed. Then, the other end of the buffer spring 4 is aligned with the second mounting groove 17 of the flow guide shell 5, and the spring is gently compressed so that its other end is fully inserted into the second mounting groove 17. After releasing the pressure, the buffer spring 4 will naturally unfold, with both ends fixed in the first mounting groove 16 and the second mounting groove 17 respectively. During use, when the external environment impacts or vibrates the device, the buffer spring 4 can absorb some of the energy. The relative movement between the extension shell 3 and the flow guide shell 5 is limited to a small range; this small displacement is sufficient to alleviate most of the impact force without affecting the overall structural stability of the device.

[0027] Example 4:

[0028] like Figures 1-5 As shown, the extended housing 3 of the utility model adopts a cylindrical structure, with a disc-shaped partition 12 disposed inside. The partition 12 is located in the middle of the extended housing 3, dividing the internal space of the extended housing 3 into two independent areas, upper and lower. A circular mounting hole 13 is machined on the partition 12, the diameter of which is slightly smaller than the outer diameter of the sealing element 14. The sealing element 14 adopts a cylindrical structure, and its outer diameter is interference-fitted with the mounting hole 13, and it is fixed in the mounting hole 13 by press-fitting. A through circular hole 15 is provided in the center of the sealing element 14, the diameter of which is slightly larger than the outer diameter of the sealing insulation wire 11. During installation, the sealing element 14 is first press-fitted and fixed in the mounting hole 13 of the partition 12, and then the sealing insulation wire 11 is passed through the through hole 15 of the sealing element 14. One end of the sealing insulation wire 11 is connected to the resistor tube 6, and the other end extends into the junction box 1 and is connected to the electrical interface 2. Through this structural design, the partition 12 separates the internal space of the extended housing 3, forming independent sealing areas. The interference fit between the seal 14 and the mounting hole 13 provides a good seal, preventing fluid from seeping in. The through hole 15 on the seal 14 allows the sealing insulation wire 11 to pass through while maintaining a tight seal through proper dimensional fitting. The entire structure forms multiple layers of sealing protection, effectively blocking the passage of fluid into the junction box 1. In practical applications, the extended housing 3 may be exposed to high-temperature, high-pressure fluid environments. The cooperation between the partition 12 and the seal 14 confines the fluid to the lower region of the extended housing 3, preventing it from entering the upper junction box 1 area. This design not only protects the electrical components within the junction box 1 but also improves the reliability and service life of the entire device in harsh environments.

[0029] Example 5:

[0030] like Figures 1-5 As shown, the seal 14 and the mounting hole 13 of the utility model are fixed and sealed by an interference fit with adhesive. First, a layer of epoxy resin is evenly applied to the inner wall of the mounting hole 13. Then, the seal 14 is pressed into the mounting hole 13, with the outer diameter of the seal 14 slightly larger than the inner diameter of the mounting hole 13, forming an interference fit. During the pressing process, excess adhesive is squeezed out, filling the tiny gap between the seal 14 and the mounting hole 13. After the adhesive cures, a strong mechanical connection and sealing structure are formed between the seal 14 and the mounting hole 13. For the connection between the sealing insulation wire 11 and the through hole 15 of the seal 14, the same interference fit with adhesive is used. During installation, a layer of silicone rubber sealant is first applied to the inner wall of the through hole 15 of the seal 14, and then the sealing insulation wire 11 is inserted into the through hole 15. The outer diameter of the sealing insulation wire 11 is slightly larger than the diameter of the through hole 15, and during insertion, the adhesive is squeezed out, making it evenly distributed in the gap between the cable and the through hole 15. After the adhesive cures, it forms an elastic sealing layer, which ensures a good sealing effect without causing excessive mechanical stress to the sealing insulation wire 11.

[0031] Example 6:

[0032] like Figures 1-5 As shown, the sealing element 14 of the utility model is made of high-temperature resistant silicone material. The selected high-temperature resistant silicone has excellent high-temperature resistance and can work stably for a long time in high-temperature environments. This material has good elasticity and compression resilience, which can adapt to temperature fluctuations in the working environment of the thermal resistor and maintain a stable sealing effect. The high-temperature resistant silicone also has excellent weather resistance and anti-aging properties, and will not show obvious hardening or embrittlement during long-term use, ensuring the service life of the sealing element 14.

[0033] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0034] The above description is only used to illustrate the technical solution of this utility model and is not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. A thermal resistance elastic protection device comprising a terminal box provided with an electrical interface, characterized in that, The junction box is provided with an extension housing, which is elastically connected to a current-guiding housing via a buffer spring. A resistance tube is fixedly installed in the current-guiding housing, and a current-guiding channel is formed inside the current-guiding housing and the resistance tube. A current guide is provided in the current-guiding housing and within the current-guiding channel. The current-guiding housing is provided with a current-guiding plate and a balance plate. The resistance tube is connected to the junction box via a sealed insulated wire.

2. A thermal fuse elastic protection device according to claim 1, characterized in that, The extended housing is provided with a partition, the partition is provided with an assembly hole, the assembly hole is sealed with a sealing element, the sealing element is provided with a through hole, and the sealing insulation wire passes through the through hole.

3. A thermal fuse resilient protection device according to claim 2, characterized in that The seal is fitted with the mounting hole by an interference fit with adhesive, and the sealing insulation wire is fitted with the through hole by an interference fit with adhesive.

4. A thermal fuse resilient protection device according to claim 2, characterized in that The sealing element is made of heat-resistant silicone.

5. A thermal fuse resilient protection device according to claim 1, characterized in that, The extended housing is provided with a first assembly groove, and the flow guide housing is provided with a second assembly groove. The first assembly groove is fixedly connected to one end of the buffer spring, and the second assembly groove is fixedly connected to the other end of the buffer spring.

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