An electrical heat trace tape flow restrictor assembly

Abstract

The utility model discloses a kind of electric heat tracing band current limiter components, comprising: current limiter body, bottom shell, cover, current limiter body is fixedly installed in bottom shell cavity, the peripheral edge of cover bottom surface can be attached on the peripheral edge of bottom shell top surface to form the shell that current limiter body is contained closed therein, current limiter body includes multiple terminal blocks, bottom shell is connected with the threading pipe that the cable diameter is adapted to cable from shell outside is passed into to the shell inside, multiple wires in cable are bundled, which can be connected with terminal block, by encapsulating the terminal block of current limiter body in shell, the combustible and explosive gas or dust of outside can be isolated to enter shell and contact the terminal block that possible discharge occurs, so that electric heat tracing band current limiter component has explosion-proof performance.

Description

Technical Field

[0001] This utility model relates to the technical field of current limiter components, and in particular to a current limiter component for electric heating tape. Background Technology

[0002] Electric heating tapes are widely used in pipelines and storage tanks of industrial enterprises such as petroleum, chemical, and power for heat tracing, insulation, anti-condensation, and antifreeze. However, electric heating tapes currently have the problem of excessive starting current. If directly energized, it may cause a short circuit or even a fire. In order to suppress excessive starting current, a current limiter is connected in series between the electric heating tape and the power supply. The current limiter is usually encapsulated in a protective shell, while the terminal block is exposed outside the protective shell. Since the terminal block may discharge, there is a risk of explosion when the current limiter is used in an environment containing flammable and explosive gases or dust. Utility Model Content

[0003] To address the technical problems existing in the background art, this utility model proposes an electric heating tape current limiter assembly.

[0004] The electric heating cable current limiter assembly includes: a current limiter body, a bottom shell, and a cover. The current limiter body is fixedly installed in the cavity of the bottom shell. The outer edge of the bottom surface of the cover can be fitted to the outer edge of the top surface of the bottom shell to form a shell that houses and encloses the current limiter body. The current limiter body includes multiple terminals. The bottom shell is connected to a conduit with a diameter adapted to the cable for the cable to pass through from outside the shell into the shell. Multiple wires that can be connected to the terminals are bundled inside the cable.

[0005] Preferably, the electric heating cable current limiter assembly also includes multiple button ball quick release pins, which are connected through the outer edges of the bottom shell and the cover, so that the outer edge of the bottom surface of the cover fits against the outer edge of the top surface of the bottom shell to form a shell that encloses and houses the current limiter body therein.

[0006] Preferably, the electric heating cable current limiter assembly further includes a silicone sealing plug, the diameter of the conduit is slightly larger than the diameter of the cable, and the silicone sealing plug is filled and assembled between the inner wall of the conduit and the outer wall of the cable.

[0007] Preferably, the electric heating cable current limiter assembly further includes a sealing gasket, which is filled and assembled between the outer periphery of the bottom surface of the housing and the outer periphery of the top surface of the housing.

[0008] Preferably, both the bottom shell and the cover shell are made of aluminum alloy.

[0009] Preferably, an insulating varnish layer is sprayed onto the outer surface of the bottom shell.

[0010] Preferably, the outer surface of the housing is coated with an insulating varnish layer.

[0011] More preferably, the quick-release pin of the button ball is also connected to an anti-loss ring.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] By encapsulating the wiring terminals of the current limiter body in a housing, external flammable and explosive gases or dust can be prevented from entering the housing and coming into contact with the wiring terminals that may cause discharge, thus giving the electric heating cable current limiter assembly explosion-proof performance.

[0014] Compared to traditional bolt connections, the button-type quick-release pins with ball bearings connect the bottom and top shells. When it is necessary to replace the cable or perform maintenance, the top shell can be easily removed from the bottom shell. Compared to mortise and tenon joints, the button-type quick-release pins with self-locking function are more reliable.

[0015] The explosion-proof performance of the electric heating cable current limiter assembly is further improved by filling the space between the conduit and the cable with a silicone sealing plug and filling the mating surfaces of the housing and the bottom shell with a sealing gasket. Attached Figure Description

[0016] Figure 1 This is a top view that mainly includes the current limiter body and the bottom shell.

[0017] Figure 2 This is a bottom view of the casing.

[0018] Figure 3 This is a front view of the button ball quick-release pin and anti-loss ring. Detailed Implementation

[0019] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0020] Reference Figure 1 , Figure 2 The electric heating cable current limiter assembly includes: a current limiter body 1, a bottom shell 2, and a cover 3. The current limiter body 1 is fixedly installed in the cavity of the bottom shell 2. The outer edge of the bottom surface of the cover 3 can be attached to the outer edge of the top surface of the bottom shell 2 to form a shell that encloses the current limiter body 1. The current limiter body 1 includes multiple terminals 11. The bottom shell 2 is connected to a conduit 21 that is compatible with the diameter of the cable 4 so that the cable 4 can pass through from the outside of the shell into the shell. Multiple wires 41 that can be connected to the terminals 11 are bundled inside the cable 4.

[0021] In practical applications, the current limiter body 1 can be fixed in the cavity of the bottom shell 2 using bolts 9. After the cable 4 is passed through the conduit 21 into the cavity of the bottom shell 2, each wire 41 is connected to the corresponding terminal block. Then the cover 3 is attached to the bottom shell 2 to form a closed shell.

[0022] By encapsulating the wiring terminals 11 of the current limiter body 1 in the housing, external flammable and explosive gases or dust can be prevented from entering the housing and coming into contact with the wiring terminals 11 that may cause discharge, thereby giving the current limiter body explosion-proof performance.

[0023] Reference Figure 3 The electric heating cable current limiter assembly also includes multiple button ball quick-release pins 5. These pins 5 are connected through the outer edges of the bottom shell 2 and the cover 3, causing the outer edge of the bottom surface of the cover 3 to fit against the outer edge of the top surface of the bottom shell 2, forming a housing that encloses the current limiter body 1 within it. Each button ball quick-release pin 5 includes a steel ball 51 that can extend and retract within the pin hole of the pin rod, and a radially outwardly protruding stop 53 arranged coaxially with the pin rod. The clamping distance D between the stops 53 is equal to the sum of the thickness of the outer edge of the bottom shell 2 and the outer edge of the cover 3. When the button 52 is pressed, the steel ball 51 will retract into the pin hole of the pin rod. At this time, the quick release pin 5 can be passed through the through hole 22 on the bottom shell 2 and the through hole 31 on the cover 3, which are matched with the diameter of the pin rod, respectively. Then the button 52 is released. At this time, the steel ball 51 will pop out from the pin hole of the pin rod, thereby fastening the bottom shell 2 and the cover 3 together.

[0024] Compared with bolt connection, the connection method using button ball quick release pin 5 is faster. When it is necessary to replace the cable or perform maintenance, the cover 3 can be easily removed from the bottom shell 2. Compared with tenon and mortise snap connection, the connection method with self-locking function is more reliable.

[0025] Reference Figure 1 The electric heating cable current limiter assembly also includes a silicone sealing plug 6. The diameter of the conduit 21 is slightly larger than the diameter of the cable 4. The silicone sealing plug 6 is filled and assembled between the inner wall of the conduit 21 and the outer wall of the cable 4 to more effectively prevent flammable and explosive gases or dust from entering the housing, thereby improving the explosion-proof performance of the electric heating cable current limiter assembly.

[0026] Reference Figure 1 The electric heating cable current limiter assembly also includes a sealing gasket 7, which is filled and assembled between the outer perimeter of the bottom surface of the housing 3 and the outer perimeter of the top surface of the bottom housing 2, so as to more comprehensively prevent flammable and explosive gases or dust from entering the housing and further improve the explosion-proof performance of the electric heating cable current limiter assembly.

[0027] Both the bottom shell 2 and the cover shell 3 are made of aluminum alloy. Aluminum alloy not only has good insulation properties, but also high strength. In addition, it has good thermal conductivity, which can dissipate the heat generated by the current limiter body in a timely manner.

[0028] An insulating varnish layer is sprayed on the outer surface of the bottom shell 2 to improve the fire resistance and flame retardant performance of the electric heating tape current limiter assembly.

[0029] An insulating varnish layer is sprayed on the outer surface of the housing 3 to further improve the fire resistance and flame retardant performance of the electric heating cable current limiter assembly.

[0030] The button ball quick-release pin 5 is also connected to an anti-loss ring 8.

[0031] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A current limiter assembly for electric heating tape, characterized in that, Includes: current limiter body (1), bottom shell (2), and cover (3). The current limiter body (1) is fixedly installed in the cavity of the bottom shell (2). The outer edge of the bottom surface of the cover (3) can be attached to the outer edge of the top surface of the bottom shell (2) to form a shell that encloses the current limiter body (1). The current limiter body (1) includes multiple terminals (11). The bottom shell (2) is connected to a conduit (21) that is compatible with the diameter of the cable (4) for the cable (4) to pass through from outside the shell into the shell. Multiple wires (41) that can be connected to the terminals (11) are bundled inside the cable (4). It also includes multiple button ball quick release pins (5), which are connected through the outer edges of the bottom shell (2) and the cover (3), so that the outer edge of the bottom surface of the cover (3) fits against the outer edge of the top surface of the bottom shell (2) to form a shell that encloses the current limiter body (1); the button ball quick release pins (5) are also connected with anti-loss rings (8); It also includes a sealing gasket (7), which is filled between the outer edge of the bottom surface of the cover (3) and the outer edge of the top surface of the bottom shell (2).

2. The current limiter assembly for electric heating tape according to claim 1, characterized in that, It also includes a silicone sealing plug (6), the diameter of the conduit (21) is slightly larger than the diameter of the cable (4), and the silicone sealing plug (6) is filled between the inner wall of the conduit (21) and the outer wall of the cable (4).

3. The current limiter assembly for electric heating tape according to claim 1, characterized in that, Both the bottom shell (2) and the cover shell (3) are made of aluminum alloy.

4. The current limiter assembly for electric heating tape according to claim 1, characterized in that, An insulating varnish layer is sprayed on the outer surface of the bottom shell (2).

5. The current limiter assembly for electric heating tape according to claim 1, characterized in that, An insulating varnish layer is sprayed on the outer surface of the cover (3).

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