Special thermal resistor in instrument well and instrument assembly

Abstract

The utility model discloses a special thermal resistor in an instrument well. The special thermal resistor comprises a thermal resistor sensor, a mounting flange, a sheath, a flange adapter, a red copper gasket, a process joint, a compensating lead, a polytetrafluoroethylene gasket, a sealing joint, a loose joint nut, a composite wiring terminal, an explosion-proof cable gland, a compensating cable and a junction box. According to the utility model, thermal resistance signals are transmitted into the junction box at a farther position by adopting the compensation line, so that the sealing requirement at the junction box can be reduced, and the sealing structure is provided with a leakage isolation layer and two sealing cavities, so that external accumulated water or other pollutants can be effectively prevented from entering a wiring area, and meanwhile, an isolation medium leaks when leakage occurs in the flange sheath.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of thermal resistance, concretely relates to a special thermal resistance in instrument well and instrument assembly. BACKGROUND

[0002] In industrial sites such as factories, mines and chemical plants, instrument wells are used to protect and monitor temperature, pressure and other instrument devices in the production process, to ensure the smooth progress of the production process and the monitoring of production efficiency. Part of the instrument well is built in the outdoor, which will produce water accumulation position or process requirement whole water cooling environment, the thermal resistance instrument installed in these environments has higher requirements for waterproof and sealing, and the conventional terminal box cannot meet the waterproof and sealing requirements. At the same time, due to the process manufacturing limit, the space of part of the instrument well is small, which has strict limitation on the size of the instrument. SUMMARY

[0003] In order to solve the above technical problems, the utility model aims at providing a special thermal resistance in instrument well and instrument assembly with good waterproof and sealing.

[0004] In order to achieve the above purpose, the technical scheme of the utility model is as follows: a special thermal resistance in instrument well, comprising a resistance sensor, a mounting flange, a sheath with a containing cavity inside, the sheath is fixedly connected with the mounting flange, the resistance sensor is arranged in the sheath, further comprising a compensation wire, a compensation cable, a composite terminal, a first sealing cavity and a second sealing cavity, the first sealing cavity and the second sealing cavity are fixedly connected with the mounting flange, the composite terminal is arranged between the first sealing cavity and the second sealing cavity to seal and separate the two, the compensation wire is arranged in the first sealing cavity and electrically connected with the resistance sensor and the composite terminal, the compensation cable extends from the second sealing cavity into the second sealing cavity and is electrically connected with the composite terminal.

[0005] Preferably, a process joint is further arranged on the mounting flange and separates the first sealing cavity from the cavity in the sheath, the process joint is electrically connected with the resistance sensor and the compensation wire.

[0006] Further preferably, the compensation cable is connected with the second sealing cavity through an explosion-proof gland.

[0007] Further preferably, one end of the compensation cable is electrically connected with the process joint, and the other end is electrically connected with the terminal box.

[0008] Further preferably, an annular flange adapter is fixedly arranged on the mounting flange, the process joint is embedded in the flange adapter, and the mounting flange is sealed through a red copper gasket.

[0009] Further preferably, a sealing joint connecting the explosion-proof gland and the flange adapter is further included, the sealing joint and the flange adapter enclosing the first sealing cavity, and the sealing joint and the explosion-proof gland enclosing the second sealing cavity.

[0010] Further preferably, the sealing joint is fixed on the flange adapter by a union nut screwed with the flange adapter.

[0011] Further preferably, a fluorine pad is arranged between the sealing joint and the flange adapter.

[0012] An instrument assembly, the special thermal resistance in the instrument well.

[0013] The utility model has the advantages of:

[0014] 1. The utility model adopts a compensation wire to transmit a thermal resistance signal to a junction box at a farther position, which can reduce the sealing requirement at the junction box.

[0015] 2. A first sealing cavity and a second sealing cavity are arranged, the compensation wire is divided into two sections, and the two sections are sealed and separated by a process joint. The sealing structure has one leakproof layer and two sealing cavities, which can effectively prevent external accumulated water or other pollution from entering the junction area and simultaneously isolate the medium from leaking out when the flange sheath leaks. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiment description. The drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor on the premise of the drawings.

[0017] The utility model will be further described in combination with the drawings and embodiments as follows:

[0018] Fig. 1 It is an explosion schematic view of one embodiment of the utility model;

[0019] Fig. 2 It is a structural schematic view of one embodiment of the utility model;

[0020] Fig. 3 It is a sectional view schematic view of one embodiment of the utility model;

[0021] Wherein: 1, sheath; 2, thermal resistance sensor; 3, mounting flange; 4, flange adapter; 5, red copper gasket; 6, process joint; 7, compensation wire; 8, fluorine pad; 9, sealing joint; 10, union nut; 11, composite junction terminal; 12, explosion-proof gland; 13, compensation cable; 14, junction box. DETAILED DESCRIPTION

[0022] Referring to the drawings Figs. 1-3 As shown in the drawings, a special thermal resistance in an instrument well includes a thermal resistance sensor 2, a mounting flange 3, a sheath 1, a flange adapter 4, a red copper gasket 5, a process joint 6, a compensation wire 7, a Teflon gasket 8, a sealing joint 9, a union nut 10, a composite terminal 11, an explosion-proof gland 12, a compensation cable 13, and a terminal box 14. The thermal resistance sensor 2 is electrically connected to the terminal box 14 through the compensation wire 7, the composite terminal 11, and the compensation cable 13.

[0023] The thermal resistance sensor 2 is welded to the process joint 6, the red copper gasket 5 is placed at the bottom of the process joint 6, and the process joint 6 is screwed to the mounting flange 3. The composite terminal 11 is welded inside the sealing joint 9, the compensation wire 7 and the compensation cable 13 are welded at both ends of the composite terminal 11, the sealing joint 9 is placed above the flange adapter 4, the Teflon gasket 8 is arranged between the sealing joint 9 and the flange adapter 4, the union nut 10 is arranged outside the sealing joint 9, and the sealing joint 9 is screwed to the flange adapter 4 through the union nut 10. The explosion-proof gland 12 is arranged at the top of the sealing joint 9, and the explosion-proof gland 12 is screwed to extrude the compensation cable 13 after being tightened.

[0024] The thermal resistance sensor 2 is welded to the process joint 6 by argon arc welding, and the process joint 6 is sealed with the red copper gasket 5 between the process joint 6 and the mounting flange 3. The mounting flange 3 is sealed by argon arc welding and the red copper gasket to form a leak-proof seal on the back of the mounting flange 3.

[0025] The composite terminal 11 is welded in the middle of the sealing joint 9 by laser welding. The sealing joint 9 is isolated from top to bottom by the composite terminal 11 itself.

[0026] The Teflon gasket 8 is arranged between the sealing joint 9 and the flange adapter 4, and is tightly extruded after being screwed by the union nut 10 to form a seal.

[0027] The explosion-proof gland 12 is arranged at the top of the sealing joint 9, and the composite terminal 11 and the compensation cable 13 are sealed at the wiring position by the explosion-proof gland 12.

[0028] The process flow of the embodiment is as follows:

[0029] The sheath 1 is inserted into the front hole of the mounting flange 3 and welded by argon arc welding, the flange adapter 4 is inserted into the back hole of the mounting flange 3 and welded by argon arc welding, the thermal resistance sensor 2 is inserted into the process adapter 6 and welded by argon arc welding, the process adapter 6 is screwed into the inside of the flange adapter 4 after the copper gasket 5 is placed on the threaded side, one side of the composite terminal 11 is soldered with the compensation wire 7, the other side is soldered with the compensation cable 13, the composite terminal 11 is placed in the middle of the sealing adapter 9 and welded by laser welding, the explosion-proof gland 12 is screwed into the threaded hole in the head of the sealing adapter 9 through the compensation cable 13, the nut on the explosion-proof gland 12 is tightened to press the compensation cable 13, the Teflon gasket 8 is placed at the bottom of the sealing adapter 9 through the compensation wire 7, the cold end lead of the thermal resistance sensor 2 is soldered with the compensation wire 7, the sealing adapter 9 is placed on the flange adapter 4 with the Teflon gasket 8 in the middle, the live joint nut 10 is screwed on the threads of the flange adapter 4 through the compensation cable 13 and the sealing adapter 9, the explosion-proof gland 12 is screwed on the compensation cable 13, the compensation cable 13 is connected to the junction box 14, and the nut on the explosion-proof gland 12 is tightened to press the compensation cable 13.

[0030] In conclusion, the utility model realizes the higher waterproof sealing requirement in the instrument well, and can be easily installed in the instrument well with limited space.

[0031] The utility model is not limited to the above-mentioned implementation, still can make various changes in the knowledge range of the person skilled in the art without departing from the purpose of the utility model, and the changed content still belongs to the protection scope of the utility model.

Claims

1. A special thermal resistor for instrument wells, comprising a resistance sensor (2), a mounting flange (3), and a sheath (1) having an internal receiving cavity, wherein the sheath (1) is fixedly connected to the mounting flange (3), and the resistance sensor (2) is disposed within the sheath (1), characterized in that: It also includes a compensating wire (7), a compensating cable (13), a composite terminal block (11), a first sealing cavity and a second sealing cavity. The first sealing cavity and the second sealing cavity are fixedly connected to the mounting flange (3). The composite terminal block (11) is disposed between the first sealing cavity and the second sealing cavity to seal and separate them. The compensating wire (7) is disposed in the first sealing cavity and electrically connects the resistance sensor (2) and the composite terminal block (11). The compensating cable (13) extends from outside the second sealing cavity into the second sealing cavity and is electrically connected to the composite terminal block (11).

2. The instrument well-specific thermal resistor according to claim 1, characterized in that: It also includes a process connector (6), which is disposed on the mounting flange (3) and separates the first sealing cavity from the cavity inside the sheath (1), and the process connector (6) is electrically connected to the resistance sensor (2) and the compensation wire (7).

3. A special thermal resistor for instrument wells according to claim 2, characterized in that: The compensation cable (13) is connected to the second sealing cavity by compression sealing through an explosion-proof gland (12).

4. A special thermal resistor for instrument wells according to claim 3, characterized in that: One end of the compensation cable (13) is electrically connected to the process connector (6), and the other end is electrically connected to the junction box (14).

5. A special thermal resistor for instrument wells according to claim 3, characterized in that: An annular flange adapter (4) is fixedly installed on the mounting flange (3), and the process connector (6) is embedded in the flange adapter (4) and sealed to the mounting flange (3) by a copper gasket (5).

6. A special thermal resistor for instrument wells according to claim 5, characterized in that: It also includes a sealing joint (9) connecting the explosion-proof gland (12) and the flange adapter (4), the sealing joint (9) and the flange adapter (4) forming the first sealing cavity, and the sealing joint (9) and the explosion-proof gland (12) forming the second sealing cavity.

7. A special thermal resistor for instrument wells according to claim 6, characterized in that: The sealing joint (9) is fixed to the flange adapter (4) by a union nut (10) that is threadedly connected to the flange adapter (4).

8. A special thermal resistor for instrument wells according to claim 7, characterized in that: A PTFE gasket (8) is provided between the sealing joint (9) and the flange adapter (4).

9. An instrument assembly, characterized in that: Includes the instrument well-specific thermal resistor as described in any one of claims 1-8.

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