Sealing reinforced explosion-proof heater

Abstract

The utility model relates to the technical field of explosion -proof heater, disclose a kind of sealing reinforced explosion -proof heater, including main casing, the one end of main casing is fixedly connected with feed pipe, the one end of main casing away from feed pipe is fixedly connected with third flange, third flange other side is fixedly connected with fourth flange, and heating pipe is fixedly installed on fourth flange, and the end of heating pipe at the outside of main casing is fixedly connected with junction box, and wire conduit is opened on junction box, and sealing assembly for electrical insulation is arranged on wire conduit, in the sealing assembly of wire conduit, even if line body exists slight bending or deformation, it can also be filled in gap by rubber deformation, prevent external gas from wire hole into junction box, and the arc-shaped sealing plate of soft rubber material is not only can adhere line body outer wall, also have excellent electrical insulation performance, avoid line body insulating layer breakage after contact with metal installation cylinder, eliminate spark leakage generated by short circuit.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof heater technology, specifically to a sealed and reinforced explosion-proof heater. Background Technology

[0002] In highly hazardous environments such as chemical, mining, and petroleum industries, sealed and reinforced explosion-proof heaters are the core equipment for heating the medium. Their junction boxes require external wiring (such as explosion-proof cables) to be introduced through conduits to achieve electrical connection between the heating element and an external power source. The sealing performance of these conduits, as the critical channel for the wiring to enter and exit the junction box, directly determines the explosion-proof safety and operational reliability of the equipment. On the one hand, it must prevent external flammable and explosive gases and dust from entering the junction box through the conduit holes, avoiding sparks from contact with the electrical terminals inside the junction box that could trigger an explosion. On the other hand, it must prevent any trace amounts of heating medium that may be present inside the junction box from leaking into the external environment, while ensuring electrical insulation between the wiring and the metal conduit to prevent short circuits caused by damaged insulation, which could further lead to safety accidents.

[0003] Existing devices have some drawbacks in use. For example, existing technologies mostly use fixed sealing structures (such as a single rubber gasket or a rigid sealing sleeve), and their sealing surface is a circular through hole of a fixed size. If the cable has slight bending, deformation, or diameter deviation, it is easy to cause gaps between the cable and the sealing element. For example, traditional rubber gaskets can only achieve sealing under the ideal condition that the cable is completely straight and the diameter is perfectly matched. Once the cable is slightly bent due to transportation or installation, a local gap will appear on the contact surface between the gasket and the cable. External flammable and explosive gases can enter the junction box through the gap, making it impossible to achieve "zero leakage" and posing a serious explosion hazard. Utility Model Content

[0004] The purpose of this invention is to provide a sealed and reinforced explosion-proof heater to solve the problem that gaps exist between the wire and the sealing element, allowing external flammable and explosive gases to enter the junction box through these gaps, posing a serious explosion hazard.

[0005] This utility model provides the following technical solution: a sealed and reinforced explosion-proof heater, comprising a main housing, a feed pipe fixedly connected to one end of the main housing, a discharge pipe fixedly connected to the other side of the main housing, a first flange fixedly connected to the top of the discharge pipe, a second flange fixedly connected to the top of the first flange, a sealing top cover fixedly connected to the top of the second flange, a third flange fixedly connected to the end of the main housing away from the feed pipe, a fourth flange fixedly connected to the other side of the third flange, a heating tube fixedly installed on the fourth flange, a junction box fixedly connected to the end of the heating tube outside the main housing, a wire conduit provided on the junction box, and a sealing component for electrical insulation provided on the wire conduit.

[0006] As a preferred embodiment of the above technical solution, the sealing assembly includes a mounting cylinder that is threadedly fixed to the outer wall of the conduit. The mounting cylinder has a wire hole, and a wire is inserted into the inner side of the wire hole. Multiple return springs are fixedly connected to the inner walls of the opposite sides of the mounting cylinder, and an arc-shaped sealing plate is fixedly connected to the ends of the multiple return springs away from the side wall of the mounting cylinder.

[0007] As a preferred embodiment of the above technical solution, symmetrical limit grooves are formed on the inner sidewall of the mounting cylinder, and limit sliders are slidably connected in each limit groove, and each limit slider is fixed to the sidewall of the corresponding arc-shaped sealing plate.

[0008] As a preferred embodiment of the above technical solution, sealing gaskets are fixedly connected to the ends of both arc-shaped sealing plates.

[0009] As a preferred embodiment of the above technical solution, a first annular groove and a second annular groove are provided on the side wall of the main housing, and a first sealing ring and a second sealing ring are fixedly connected to the side wall of the fourth flange near the main housing.

[0010] As a preferred embodiment of the above technical solution, mounting bases are fixedly installed on both sides of the lower end face of the main housing.

[0011] Compared with the prior art, the beneficial effects of this utility model are: In this invention, even if the cable body is slightly bent or deformed, the sealing assembly of the cable conduit can fill the gap through rubber deformation, preventing external gas from entering the junction box through the cable hole. The arc-shaped sealing plate and sealing gasket made of soft rubber not only fit the outer wall of the cable body, but also have excellent electrical insulation performance, preventing the cable body insulation layer from contacting the metal mounting cylinder after damage, and eliminating spark leakage caused by short circuit. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of a sealed and reinforced explosion-proof heater; Figure 2 A first-view explosion structure diagram of a sealed and reinforced explosion-proof heater; Figure 3 A second-view explosion structure diagram of a sealed and reinforced explosion-proof heater; Figure 4 A first-view exploded structural diagram of the sealing assembly; Figure 5 This is a second-view exploded structural diagram of the sealing assembly.

[0013] In the diagram: 1. Main housing; 101. Mounting base; 11. Feed pipe; 111. Discharge pipe; 12. First flange; 13. Second flange; 14. Sealing top cover; 15. Third flange; 16. Fourth flange; 17. Heating tube; 18. Junction box; 19. Cable conduit; 2. Sealing assembly; 21. Mounting cylinder; 22. Cable hole; 23. Cable body; 24. Return spring; 25. Arc-shaped sealing plate; 251. Sealing gasket; 31. Limiting groove; 32. Limiting slider; 41. First annular groove; 42. Second annular groove; 43. First sealing ring; 44. Second sealing ring. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] Example like Figures 1-5 As shown, this utility model provides a technical solution: a sealed and reinforced explosion-proof heater, including a main housing 1, a feed pipe 11 fixedly connected to one end of the main housing 1, a discharge pipe 111 fixedly connected to the other side of the main housing 1, a first flange 12 fixedly connected to the top of the discharge pipe 111, a second flange 13 fixedly connected to the top of the first flange 12, a sealing top cover 14 fixedly connected to the top of the second flange 13, a third flange 15 fixedly connected to the end of the main housing 1 away from the feed pipe 11, a fourth flange 16 fixedly connected to the other side of the third flange 15, a heating tube 17 fixedly installed on the fourth flange 16, and the end of the heating tube 17 located outside the main housing 1 fixedly connected to... A junction box 18 is provided, and a cable conduit 19 is provided on the junction box 18. A sealing component 2 for electrical insulation is provided on the cable conduit 19. In actual use, the feed pipe 11 is connected to the external medium supply pipe through the corresponding flange (if the feed pipe 11 does not have its own flange, an adapter flange needs to be installed). A sealing gasket 251 matching the medium is placed between the flanges. The first flange 12 and the second flange 13 at the top of the discharge pipe 111 are connected. Because there may be medium pressure fluctuations at the discharge end, a double protection of "main sealing gasket 251 + auxiliary sealant" needs to be installed between the flanges. The flame-retardant and explosion-proof cable is introduced from the cable conduit 19 and is sealed when passing through the sealing component 2.

[0016] During use, the medium is injected and circulated. The valve of the feed pipe 11 is slowly opened until the main housing 1 is filled with the medium (air is discharged through the exhaust valve of the discharge pipe 111, and the exhaust valve is closed after there are no more air bubbles). Then, the heating tube 17 is started through the junction box 18 to heat the medium. Then, the valve of the discharge pipe 111 is gradually opened (to keep the feed and discharge flow rates balanced and avoid a sudden increase in pressure inside the housing).

[0017] As one implementation method in this embodiment, such as Figure 4 and Figure 5As shown, the sealing assembly 2 includes a mounting cylinder 21 threadedly fixed to the outer wall of the cable conduit 19. The mounting cylinder 21 has a cable hole 22, into which a cable 23 is inserted. Multiple return springs 24 are fixedly connected to the inner walls of opposite sides of the mounting cylinder 21. Arc-shaped sealing plates 25 are fixedly connected to the ends of the multiple return springs 24 away from the side walls of the mounting cylinder 21. Limiting grooves 31 are symmetrically formed on the inner wall of the mounting cylinder 21. Limiting sliders 32 are slidably connected within each limiting groove 31, and each limiting slider 32 is fixed to the corresponding side wall of the arc-shaped sealing plate 25. Sealing gaskets 251 are fixedly connected to the ends of both arc-shaped sealing plates 25. In actual use, the cable 23 is first passed through the cable hole 22 and into the junction box 18. The terminal is connected, and then the mounting sleeve 21 is threaded onto the cable conduit 19. At this time, the cable hole 22 and the cable body 23 are not completely fitted (due to gaps caused by bending or deformation of the cable body 23). At this time, the limiting slider 32 slides along the limiting groove 31 to ensure that the arc-shaped sealing plate 25 moves smoothly. When the cable body 23 passes through the cable hole 22, it passes through the arc-shaped sealing plate 25. The arc-shaped sealing plate 25 is squeezed and moves in the opposite direction to the cable body 23. After the cable body 23 is installed, the arc-shaped sealing plate 25 is fitted to the surface of the cable body 23 by the rebound of the return spring 24. The arc-shaped sealing plate 25 is made of soft rubber (even if the cable body 23 has slight unevenness, the rubber can fill the small gaps through its own deformation) and can completely fit the surface of the cable.

[0018] As one implementation method in this embodiment, such as Figure 2 and Figure 3 As shown, a first annular groove 41 and a second annular groove 42 are provided on the side wall of the main housing 1. A first sealing ring 43 and a second sealing ring 44 are fixedly connected to the side wall of the fourth flange 16 near the main housing 1. In actual use, the first sealing ring 43 serves as the first line of defense, mainly intercepting flammable and explosive gases (such as methanol vapor in the workshop) from the external environment from entering the flange gap, while preventing trace amounts of media in the main housing 1 from leaking outward. The second sealing ring 44 serves as the second line of defense, which can further block trace amounts of leakage through the first sealing ring 43 (such as gap leakage caused by local wear of the first sealing ring 43), forming a double insurance.

[0019] As one implementation method in this embodiment, such as Figure 1 As shown, mounting bases 101 are fixedly installed on both sides of the lower end face of the main housing 1 to support and fix the main housing 1.

[0020] The above embodiments are only used to illustrate the technical solution of this utility model, and are not intended to limit it.

Claims

1. A sealed and reinforced explosion-proof heater, comprising a main housing (1), characterized in that: One end of the main housing (1) is fixedly connected to a feed pipe (11), and the other side of the main housing (1) is fixedly connected to a discharge pipe (111). The top end of the discharge pipe (111) is fixedly connected to a first flange (12), the top end of the first flange (12) is fixedly connected to a second flange (13), the top end of the second flange (13) is fixedly connected to a sealing top cover (14), the end of the main housing (1) away from the feed pipe (11) is fixedly connected to a third flange (15), the other side of the third flange (15) is fixedly connected to a fourth flange (16), a heating pipe (17) is fixedly installed on the fourth flange (16), and a junction box (18) is fixedly connected to the end of the heating pipe (17) outside the main housing (1). A wire conduit (19) is opened on the junction box (18), and a sealing component (2) for electrical insulation is provided on the wire conduit (19).

2. The sealed and reinforced explosion-proof heater according to claim 1, characterized in that: The sealing assembly (2) includes a mounting cylinder (21) threadedly fixed to the outer wall of the wire passage pipe (19). The mounting cylinder (21) has a wire passage hole (22). A wire body (23) is inserted into the inner side of the wire passage hole (22). Multiple return springs (24) are fixedly connected to the inner walls of the opposite sides of the mounting cylinder (21). An arc-shaped sealing plate (25) is fixedly connected to the ends of the multiple return springs (24) away from the side wall of the mounting cylinder (21).

3. The sealed and reinforced explosion-proof heater according to claim 2, characterized in that: The mounting cylinder (21) has symmetrically provided limiting grooves (31) on its inner sidewall. Each limiting groove (31) is slidably connected to a limiting slider (32), and each limiting slider (32) is fixed to the sidewall of the corresponding arc-shaped sealing plate (25).

4. The sealed and reinforced explosion-proof heater according to claim 2, characterized in that: Both ends of the two arc-shaped sealing plates (25) are fixedly connected with sealing gaskets (251).

5. A sealed and reinforced explosion-proof heater according to claim 1, characterized in that: The main housing (1) has a first annular groove (41) and a second annular groove (42) on its side wall. The fourth flange (16) has a first sealing ring (43) and a second sealing ring (44) fixedly connected to its side wall near the main housing (1).

6. The sealed and reinforced explosion-proof heater according to claim 1, characterized in that: Mounting bases (101) are fixedly installed on both sides of the lower end face of the main housing (1).

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