Low-temperature integrated maintenance-free thermal resistor

Abstract

The utility model discloses a low temperature integrated maintenance -free thermal resistance belongs to thermal resistance technical field. The utility model discloses a device includes junction box, protection pipe, airtight sheath pipe, electrical outlet and conversion joint. Conversion joint is composed of aviation fast plug connector (including male head and female head) and gran head. Gran head one end fixed cable, and the other end is fixedly connected with male head. Male head and cable realize electric connection through cable line welding point, and female head is connected with male head through plug -in, and is electrically connected with junction box. The female head both ends are equipped with lock nut, ensure firm connection. The device adopts integrated design, fixes through lock nut, reduces the trouble caused by the connection problem, avoids the inaccuracy of measurement or no signal problem caused by screw loosening in traditional instrument installation, reduces enterprise production loss. Meanwhile, construction personnel can complete installation once when making cold box, need not subsequent high -altitude inspection, simplifies maintenance process, guarantees the safety of workers.

Description

Technical Field

[0001] This utility model belongs to the field of resistance temperature detector (RTD) technology, specifically relating to a low-temperature integrated maintenance-free RTD. Background Technology

[0002] Due to the cold insulation requirements of cold boxes in cryogenic industries such as air separation cold boxes, LNG cold boxes, and CO cold boxes, perlite insulation material needs to be filled into the cold box. The cold box is calculated based on the requirements of equipment distillation and heat transfer characteristics, and is usually made with a larger width and greater height to reduce cold loss and achieve energy saving. Resistance temperature detectors (RTDs) are indispensable in the cold box as temperature monitoring points. RTDs are distributed on the upper, middle, and lower heat exchangers or pipelines of the cold box tower according to process requirements to monitor changes in material temperature, serving as a basis for operator adjustments. In this case, temperature is crucial to the process, as temperature changes determine product quality and production capacity. The towers in the cold box normally operate between -100 and -190 degrees Celsius depending on the medium (e.g., ethylene -120 degrees Celsius, liquid nitrogen -190 degrees Celsius, liquid oxygen -186 degrees Celsius). Due to the low-temperature characteristics of these materials, distillation methods are used to obtain them at low temperatures, resulting in a relatively high distillation tower. Since the distillation tower is installed in the cold box, the cold box tower needs to be made relatively tall. When measuring the temperature at the top of the tower, the measuring point is located at the top of the cold box of the air separation tower. The height varies considerably depending on the size of the unit, with some towers reaching 100 meters or even higher. Because the fixed components can cause cold air leakage, affecting the cooling capacity of the equipment, and considering the insulation requirements within the cold box, the tower body and cold box supports cannot use many fixed components. Maintenance personnel lack sufficient support, making maintenance extremely difficult and posing a significant safety hazard. Furthermore, after filling the cold box with perlite insulation material, entering the cold box to inspect the thermometer requires first removing the perlite and then allowing it to settle before technicians can inspect the RTDs. After troubleshooting, perlite must be added again. Such cumbersome procedures require the manufacturer to handle any RTD problems, necessitating production shutdowns and lengthy processes. Additionally, perlite cannot be inhaled and cannot be expelled, posing a health risk.

[0003] Therefore, there is an urgent need to develop a maintenance-free thermal resistor that can reduce the probability of production stoppages and losses, is easy to install and maintain, reduces the risk of workers having to work at heights, and lowers the probability of unsafe factors for factory workers. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies and provide a low-temperature integrated maintenance-free thermal resistor.

[0005] The specific technical solution adopted in this utility model is as follows:

[0006] This utility model provides a low-temperature integrated maintenance-free thermal resistor, including: a junction box, a protective tube, a sealed sheath, an electrical outlet, and a conversion connector. One end of the protective tube is fixedly connected to the bottom of the junction box, and the other end is inserted into the sealed sheath and fixedly connected to the sealed sheath. An electrical outlet is provided on the side of the junction box, and the conversion connector is fixedly connected to the junction box through the electrical outlet.

[0007] The adapter includes an aviation quick-connect connector and a gland connector. The aviation quick-connect connector includes a male and a female connector. One end of the female connector's terminal block is electrically connected to the terminal block in the junction box via a connecting wire. One end of the male connector is connected to the female connector via a plug-in connection. The inner side of the male connector's housing and the outer circumference of the female connector's housing have matching threaded structures, and the male and female connectors are fixedly connected by the threads. The other end of the male connector has a cable solder joint for electrical connection with a cable. The cable solder joint is electrically connected to the male connector's terminal block via a connecting wire. One end of the gland connector is fixedly fitted with a cable, and the other end of the gland connector is fixedly connected to the male connector. The cable and the cable solder joint of the male connector are fixed by welding.

[0008] Locking components are provided at both ends of the female connector near the electrical outlet.

[0009] Preferably, the protective tube is provided with a threaded fastener in the middle, and the protective tube and the sealed sheath are fixedly connected by the threaded fastener.

[0010] Preferably, the gland is an explosion-proof sealed gland.

[0011] Preferably, the junction box has six terminals, and the female connector has six corresponding terminals. The six terminals are electrically connected to the terminals in the female connector through connecting wires.

[0012] Preferably, the connecting wire is fixed to the female connector and the terminal in the junction box by welding.

[0013] Preferably, the locking component is a nut.

[0014] Preferably, the outer surface of the female head is designed with full threads.

[0015] Preferably, the male connector has an internal thread at the end near the gland, and the male connector and the gland are fixedly connected by the thread.

[0016] Compared with the prior art, this utility model has the following advantages:

[0017] This invention provides a human-centered design for a resistance temperature detector (RTD) converter suitable for low-temperature environments. The converter features an integrated installation method, with a single cable directly connecting to the outside of the cold box. Locking nuts at both ends of the converter ensure secure connection, reducing malfunctions caused by connection issues. This effectively avoids the problems of inaccurate RTD measurement points or no signal caused by loose screws during traditional instrument installation, thus reducing the probability of production downtime and associated losses. Furthermore, installation can be completed in one go during cold box fabrication, eliminating the need for workers to climb and inspect the RTD fixing bolts after the cold box is erected. This simplifies maintenance procedures, reduces the risks associated with working at height, and ensures worker safety. Attached Figure Description

[0018] Figure 1 A schematic diagram of the integrated low-temperature maintenance-free RTD provided for this implementation;

[0019] Figure 2 This is a wiring diagram of the low-temperature integrated maintenance-free RTD connection connector provided in this embodiment;

[0020] In the diagram: Junction box 1, Protective tube 2, Sealed sheath 3, Electrical outlet 4, Adapter 5, Aviation quick connector 5-1, Male connector 5-11, Female connector 5-12, Gland connector 5-2, Locking component 6. Detailed Implementation

[0021] To make the above-mentioned objectives, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below. Technical features in various embodiments of this utility model can be combined appropriately without conflict.

[0022] like Figure 1As shown, in a preferred embodiment of this utility model, this embodiment provides a low-temperature integrated maintenance-free RTD, including a junction box 1, a protective tube 2, an electrical outlet 4, and a conversion connector 5. The bottom of the junction box 1 is fixedly connected to one end of the protective tube 2, and the other end of the protective tube 2 is inserted into a sealed sheath 3. A threaded fastener is provided in the middle of the protective tube 2. In this embodiment, the threaded fastener uses internal and external screws. The protective tube 2 and the sealed sheath 3 are fixedly connected by internal and external screw threads. In other embodiments, other suitable threaded fasteners can also be used to fix the protective tube 2 and the sealed sheath 3 together. An electrical outlet 4 is provided on the side of the junction box 1, and the conversion connector 5 is fixedly connected to the junction box 1 through the electrical outlet 4.

[0023] like Figure 2 As shown, in this embodiment, the adapter 5 includes an aviation quick-connect connector 5-1 and a gland 5-2. Since the cryogenic integrated maintenance-free RTD provided in this embodiment is primarily used inside cold boxes, which contain cryogenic liquids, a leak of these liquids could lead to the accumulation of flammable gases and potentially cause an explosion. Therefore, in this embodiment, the gland 5-2 is an explosion-proof sealed gland to prevent sparks or arcs from propagating into the cold box through the cable introduction device, thus avoiding an explosion. Furthermore, because the explosion-proof sealed gland has excellent sealing performance, it not only prevents cryogenic liquids or gases inside the cold box from leaking into the external environment through the gland 5-2, but also prevents external moisture and dust from entering the cold box and affecting the normal operation of the equipment.

[0024] In the device provided in this embodiment, the aviation quick-connect connector 5-1 includes a male connector 5-11 and a female connector 5-12. One end of the terminal of the female connector 5-12 is electrically connected to the terminal in the junction box 1 via a connecting wire. Considering the difficulty of maintaining cryogenic cold boxes and based on the three-wire principle of RTD (Resistance Temperature Detector), this design incorporates six terminals in the junction box 1, such as... Figure 2 As shown in the diagram, A1, B1, C1, A2, B2, and C2 correspond to six terminals in the female connector 5-12. These six terminals are electrically connected to the six terminals via connecting wires. In this embodiment, any commercially available wire can be used as the connecting wire. To prevent the thermal resistor connecting wire from loosening or falling off due to vibrations during equipment transportation or operation, thus causing a break in the temperature measurement point, both ends of the connecting wire are welded to the six terminals in junction box 1 and the six terminals of female connector 5-12. In this embodiment, the outer surface of female connector 5-12 has a fully threaded structure for easy connection to the electrical interface 4. Locking components 6 are provided at both ends of female connector 5-12 near the electrical outlet 4. In this embodiment, the locking components 6 are nuts, which secure female connector 5-12 to the electrical interface 4, preventing displacement or detachment of female connector 5-12 caused by vibrations during operation of the cold box equipment.

[0025] In the device provided in this embodiment, the terminal at one end of the male connector 5-11 matches the terminal at the female connector 5-12, and the male connector 5-1 and the female connector 5-12 are connected by a plug-in connection. The inner side of the male connector 5-11 housing has a threaded structure that matches the outer circumferential surface of the female connector 5-12 housing, facilitating the connection and fixation between the male and female connectors and preventing vibrations during the operation of the cold box equipment from causing the male and female connectors to disconnect or fall off. The other end of the male connector 5-11 has a cable soldering point for electrical connection with the cable. Since the female connector 5-12 has six terminals in this embodiment, the male connector 5-11 also has six corresponding terminals, resulting in six cable soldering points. The cable soldering points and the terminals of the male connector 5-11 are electrically connected one-to-one via connecting wires.

[0026] In the device provided in this embodiment, a cable is fixedly connected to one end of the gland 5-2, which clamps the cable to prevent it from falling off. Since cold box equipment typically experiences vibration during operation, the cable welding point between the cable and the male connector 5-11 is fixed by welding in this embodiment, reducing the possibility of poor contact between the cable and the aviation quick-connect connector 5-1 and minimizing maintenance frequency. The male connector 5-11 has an internal thread near the gland 5-2, and the male connector 5-11 and gland 5-2 are fixedly connected by the thread, facilitating their interaction to enhance the clamping effect on the cable and effectively preventing loosening and detachment between the cable and the gland 5-2, ensuring connection stability.

[0027] This utility model provides a low-temperature integrated maintenance-free RTD through structural innovation. The cable and aviation quick-connect connector 5-1, as well as the six terminals inside the junction box 1, are all connected by welding. A single cable connects directly to the outside of the cold box. After installation during the cold box manufacturing process, construction personnel do not need to climb up again to check whether the fixing bolts of the RTD are loose after the cold box is erected. This can reduce the failure rate of RTD wiring in the low-temperature cold box industry, effectively improve the construction efficiency of workers, and reduce the risk of accidents during the maintenance process, bringing great convenience to the operation and maintenance of the factory.

[0028] The embodiments described above are merely preferred solutions of this utility model, and are not intended to limit the scope of this utility model. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this utility model. Therefore, all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this utility model.

Claims

1. A low-temperature integrated maintenance-free thermal resistor, characterized in that, include: The junction box (1), protective tube (2), sealed sheath (3), electrical outlet (4) and conversion connector (5) are provided. One end of the protective tube (2) is fixedly connected to the bottom of the junction box (1), and the other end is inserted into the sealed sheath (3) and fixedly connected to the sealed sheath (3). The junction box (1) is provided with an electrical outlet (4) on its side, and the conversion connector (5) is fixedly connected to the junction box (1) through the electrical outlet (4). The adapter (5) includes an aviation quick-connect connector (5-1) and a gland connector (5-2). The aviation quick-connect connector (5-1) includes a male connector (5-11) and a female connector (5-12). One end of the female connector (5-12) terminal is electrically connected to the terminal in the junction box (1) via a connecting wire. One end of the male connector (5-11) is connected to the female connector (5-12) by plugging. The inner side of the male connector (5-11) housing and the outer periphery of the female connector (5-12) housing are provided with matching... The cable gland has a threaded structure, with the male (5-11) and female (5-12) connected by threads. The other end of the male (5-11) has a cable welding point for electrical connection with a cable. The cable welding point is electrically connected to the terminal block of the male (5-11) via a connecting wire. One end of the gland (5-2) is fixedly fitted with a cable, and the other end of the gland (5-2) is fixedly connected to the male (5-11). The cable is fixed to the cable welding point of the male (5-11) by welding. The female head (5-12) is equipped with locking components (6) at both ends near the electrical outlet (4).

2. The low-temperature integrated maintenance-free thermal resistor according to claim 1, characterized in that, The protective tube (2) is provided with a threaded fastener in the middle, and the protective tube (2) and the sealed sheath tube (3) are fixedly connected by the threaded fastener.

3. The low-temperature integrated maintenance-free thermal resistor according to claim 1, characterized in that, The gland (5-2) is an explosion-proof sealed gland.

4. The low-temperature integrated maintenance-free thermal resistor according to claim 1, characterized in that, The junction box (1) is provided with six terminals, and the female connector (5-12) is provided with six corresponding terminals. The six terminals are electrically connected to the terminals in the female connector (5-12) through connecting wires.

5. The low-temperature integrated maintenance-free thermal resistor according to claim 1, characterized in that, The connecting wires are fixed to the female connector (5-12) and the terminals in the junction box (1) by welding.

6. The low-temperature integrated maintenance-free thermal resistor according to claim 1, characterized in that, The locking component (6) is a nut.

7. The low-temperature integrated maintenance-free thermal resistor according to claim 1, characterized in that, The outer surface of the female head (5-12) is designed with full threads.

8. The low-temperature integrated maintenance-free thermal resistor according to claim 1, characterized in that, The male connector (5-11) has an internal thread at one end near the gland connector (5-2), and the male connector (5-11) and the gland connector (5-2) are fixedly connected by the thread.

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