High-voltage explosion-proof electric heater

Abstract

The utility model discloses a high-voltage explosion-proof electric heater which comprises an explosion-proof junction box, a heater cylinder and a heating pipe, the lower end of the explosion-proof junction box is provided with a lower explosion-proof flange, the top surface of the lower explosion-proof flange is provided with a spring groove, the spring groove is internally provided with an anti-loose spring, the upper end of the anti-loose spring is provided with a pressing plate, and the upper end of the anti-loose spring is provided with a pressing plate. The lower end of the anti-loose spring is fixed in the spring groove, and a lower fixing hole penetrating through the lower anti-explosion flange is formed in the bottom face of the spring groove. The anti-loose spring and the pressing plate are arranged above the lower fixing hole in the lower anti-explosion flange, when bolt connection is carried out, the bolt can press the pressing plate downwards and compress the anti-loose spring in the inserting process, on one hand, the anti-loose spring can absorb vibration, on the other hand, the anti-loose spring stores elastic force to apply upward counter-acting force to the bolt, and therefore the anti-explosion effect is achieved. Connection looseness caused by bolt rotation due to external impact is effectively prevented, and stable and reliable connection is ensured, so that the sealing performance is ensured, the anti-explosion heater is more suitable for a high-temperature and high-pressure working environment, and the explosion risk is reduced.

Description

Technical Field

[0001] This utility model relates to a high-voltage explosion-proof electric heater. Background Technology

[0002] High-pressure explosion-proof electric heaters are devices with significant application value in specific industrial environments. They operate under high pressure, converting electrical energy into heat energy to heat various media. These electric heaters are typically used in hazardous locations containing flammable and explosive gases, vapors, or dust, such as for heating reaction vessels in the petrochemical industry and for insulating wellhead equipment in oil and gas extraction.

[0003] Good sealing is one of the key factors for high-pressure explosion-proof electric heaters to achieve their explosion-proof function. In flammable and explosive environments, if the equipment is not well sealed, external explosive mixtures, such as flammable gases, vapors, or dust, may enter the equipment. During operation, the electric heater, due to the presence of electrical components and the potential for electric sparks and high-temperature surfaces, can cause an explosion if it comes into contact with these explosive mixtures, resulting in serious injury and damage to personnel and equipment. Utility Model Content

[0004] The main objective of this invention is to provide a high-voltage explosion-proof electric heater to solve the problems mentioned in the background art.

[0005] The objective of this utility model can be achieved by adopting the following technical solution:

[0006] A high-voltage explosion-proof electric heater includes an explosion-proof junction box, a heater cylinder, and a heating tube. The lower end of the explosion-proof junction box has a lower explosion-proof flange. A spring groove is provided on the top surface of the lower explosion-proof flange. An anti-loosening spring is installed in the spring groove. A pressure plate is provided at the upper end of the anti-loosening spring. The lower end of the anti-loosening spring is fixed in the spring groove. A lower fixing hole penetrating the lower explosion-proof flange is provided on the bottom surface of the spring groove. When not bolted, the pressure plate is pushed out of the spring groove by the anti-loosening spring. When bolted, the bolt presses the pressure plate into the spring groove.

[0007] Preferably, a heater flange is provided at the top of the heater cylinder, and the heater flange is fixedly connected to the lower explosion-proof flange.

[0008] Preferably, the bottom surface of the lower explosion-proof flange is provided with a sealing groove, and a lower sealing ring is provided in the sealing groove.

[0009] Preferably, the lower explosion-proof flange is provided with a pressure plate groove at the top of the spring groove, and both the pressure plate and the pressure plate groove are hexagonal structures.

[0010] Preferably, the upper end of the explosion-proof junction box is provided with an upper explosion-proof flange, a junction box cover is connected to the upper explosion-proof flange, and an upper sealing ring is provided between the upper explosion-proof flange and the junction box cover.

[0011] Preferably, the bottom surface of the upper explosion-proof flange is provided with a spring tube, and a vibration damping spring is provided inside the spring tube. One end of the vibration damping spring is fixed to the upper explosion-proof flange, and the other end of the vibration damping spring is provided with a buffer column. The top surface of the lower explosion-proof flange is provided with a plug pipe, and the bottom end of the buffer column is inserted into the plug pipe.

[0012] Preferably, the top of the inner wall of the heater cylinder is provided with multiple guide grooves along its circumference, and the bottom of the outer wall of the explosion-proof junction box is provided with multiple guide strips along its circumference. The bottom of the explosion-proof junction box is inserted into the heater cylinder.

[0013] Preferably, the heater cylinder has a perforated plate inside for fixing the heating tube.

[0014] The beneficial technical effects of this utility model are as follows:

[0015] 1. This utility model features an anti-loosening spring and a pressure plate above the lower fixing hole on the lower explosion-proof flange. During bolt connection, the bolt presses down on the pressure plate and compresses the anti-loosening spring as it is inserted. On the one hand, the anti-loosening spring absorbs vibration; on the other hand, the stored elasticity of the anti-loosening spring applies an upward reaction force to the bolt, effectively preventing external impacts from causing the bolt to rotate and loosening the connection. This ensures a stable and reliable connection, thereby guaranteeing the sealing performance of the lower sealing ring between the lower explosion-proof flange and the heater flange. This makes the explosion-proof heater more adaptable to high-temperature and high-pressure working environments and reduces the risk of explosion.

[0016] 2. The vibration damping spring provided by this utility model can absorb vibration energy and drive the buffer column to move when encountering vibration, thereby reducing the external force transmitted to the explosion-proof junction box and further enhancing the stability of the connection. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the explosion-proof electric heater structure according to an embodiment of the present invention;

[0018] Figure 2 This is a cross-sectional view showing the position of the anti-loosening spring in an embodiment of this utility model;

[0019] Figure 3 This is a cross-sectional view showing the position of the damping spring in an embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the front structure of the explosion-proof junction box according to an embodiment of the present invention;

[0021] Figure 5This is a schematic diagram of the bottom structure of the explosion-proof junction box according to an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of the heater cylinder structure according to an embodiment of the present invention;

[0023] Figure 7 This is a schematic diagram of the pressure plate extending from the spring groove in an embodiment of the present invention.

[0024] In the diagram: 1. Explosion-proof junction box; 2. Heater cylinder; 3. Heating tube; 4. Lower explosion-proof flange; 5. Spring groove; 6. Anti-loosening spring; 7. Pressure plate; 8. Lower fixing hole; 9. Heater flange; 10. Sealing groove; 11. Lower sealing ring; 12. Pressure plate groove; 13. Upper explosion-proof flange; 14. Junction box cover; 15. Upper sealing ring; 16. Spring tube; 17. Vibration damping spring; 18. Buffer column; 19. Connecting pipe; 20. Guide groove; 21. Guide strip; 22. Perforated plate. Detailed Implementation

[0025] To enable those skilled in the art to understand the technical solution of this utility model more clearly, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of this utility model is not limited thereto.

[0026] like Figures 1-7 As shown, this embodiment provides a high-voltage explosion-proof electric heater, including an explosion-proof junction box 1, a heater cylinder 2, and a heating tube 3. The lower end of the explosion-proof junction box 1 is provided with a lower explosion-proof flange 4. The top surface of the lower explosion-proof flange 4 is provided with a spring groove 5. An anti-loosening spring 6 is provided in the spring groove 5. A pressure plate 7 is provided at the upper end of the anti-loosening spring 6. The lower end of the anti-loosening spring 6 is fixed in the spring groove 5. The bottom surface of the spring groove 5 is provided with a lower fixing hole 8 that penetrates the lower explosion-proof flange 4. When no bolt connection is made, the pressure plate 7 is pushed out of the spring groove 5 by the anti-loosening spring 6. When bolt connection is made, the bolt presses the pressure plate 7 into the spring groove 5.

[0027] During bolt connection, the bolt presses down on the pressure plate 7 and compresses the anti-loosening spring 6 during insertion. On the one hand, the anti-loosening spring 6 can absorb vibration, and on the other hand, the stored elasticity of the anti-loosening spring 6 can apply an upward reaction force to the bolt, effectively preventing external impact from causing the bolt to rotate and causing the connection to loosen, ensuring a stable and reliable connection. This ensures the sealing performance of the lower sealing ring 11 between the lower explosion-proof flange 4 and the heater flange 9, making the explosion-proof heater more adaptable to high-temperature and high-pressure working environments and reducing the risk of explosion.

[0028] In this embodiment, as Figure 6 As shown, a heater flange 9 is provided at the top of the heater cylinder 2. The heater flange 9 is fixedly connected to the lower explosion-proof flange 4 to ensure a firm connection between the heater cylinder 2 and the explosion-proof junction box 1.

[0029] In this embodiment, as Figure 5 As shown, a sealing groove 10 is provided on the bottom surface of the lower explosion-proof flange 4, and a lower sealing ring 11 is provided in the sealing groove 10 to ensure the sealing effect.

[0030] In this embodiment, as Figure 4 As shown, a pressure plate groove 12 is provided at the top of the spring groove 5 on the lower explosion-proof flange 4. Both the pressure plate 7 and the pressure plate groove 12 are hexagonal structures to prevent the pressure plate 7 from rotating during the bolt tightening process and to ensure that the bolt's clamping force on the pressure plate 7 is evenly distributed.

[0031] In this embodiment, as Figure 2 As shown, an upper explosion-proof flange 13 is provided at the upper end of the explosion-proof junction box 1. A junction box cover 14 is connected to the upper explosion-proof flange 13. An upper sealing ring 15 is provided between the upper explosion-proof flange 13 and the junction box cover 14. Two upper sealing rings 15 are provided at intervals, respectively provided on the top surface of the upper explosion-proof flange 13 and the bottom surface of the junction box cover 14, to ensure the sealing effect. The connection method between the upper explosion-proof flange 13 and the junction box cover 14 can refer to the connection method between the lower explosion-proof flange 4 and the heater flange 9, to further ensure the connection stability and sealing performance.

[0032] In this embodiment, as Figure 3 As shown, a spring tube 16 is provided on the bottom surface of the upper explosion-proof flange 13, and a vibration damping spring 17 is provided inside the spring tube 16. One end of the vibration damping spring 17 is fixed to the upper explosion-proof flange 13, and a buffer column 18 is provided on the other end of the vibration damping spring 17. A plug-in pipe 19 is provided on the top surface of the lower explosion-proof flange 4. The bottom end of the buffer column 18 is inserted into the plug-in pipe 19, and the upper end of the buffer column 18 is fixedly connected to the vibration damping spring 17. The lower end of the buffer column 18 is a movable section. When subjected to external vibration, the vibration damping spring 17 can absorb and buffer these impact forces through its own elastic deformation, and drive the buffer column 18 to move, reducing the impact of vibration on the explosion-proof junction box 1 and other connected components, extending the service life of the equipment, and preventing problems such as component loosening and seal failure caused by vibration.

[0033] In this embodiment, as Figure 5 and Figure 6 As shown, the top of the inner wall of the heater cylinder 2 is provided with multiple guide grooves 20 along its circumference, and the bottom of the outer wall of the explosion-proof junction box 1 is provided with multiple guide strips 21 along its circumference. The bottom end of the explosion-proof junction box 1 is inserted into the heater cylinder 2. During the process of inserting the bottom end of the explosion-proof junction box 1 into the heater cylinder 2, it can play a precise guiding role, ensuring that the explosion-proof junction box 1 can be smoothly and accurately inserted into the heater cylinder 2, ensuring that the holes on the lower explosion-proof flange 4 and the heater flange 9 can be accurately aligned, and improving the fixing effect of the bolt connection.

[0034] In this embodiment, as Figure 2 As shown, the heater cylinder 2 has a perforated plate 22 inside for fixing the heating tube 3, which improves the stability of the overall structure.

[0035] In summary, in this embodiment, by providing an anti-loosening spring 6 and a pressure plate 7 above the lower fixing hole 8 on the lower explosion-proof flange 4, during bolt connection, the bolt presses down on the pressure plate 7 and compresses the anti-loosening spring 6 during insertion. On the one hand, the anti-loosening spring 6 can absorb vibration; on the other hand, the stored elasticity of the anti-loosening spring 6 can apply an upward reaction force to the bolt, effectively preventing external impacts from causing the bolt to rotate and loosening the connection, ensuring a stable and reliable connection. This ensures the sealing performance of the lower sealing ring 11 between the lower explosion-proof flange 4 and the heater flange 9, making the explosion-proof heater more adaptable to high-temperature and high-pressure working environments and reducing the risk of explosion.

[0036] The above description is only a further 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 scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A high-voltage explosion-proof electric heater, comprising an explosion-proof junction box (1), a heater body (2), and a heating tube (3), characterized in that: The explosion-proof junction box (1) is provided with a lower explosion-proof flange (4) at its lower end. A spring groove (5) is provided on the top surface of the lower explosion-proof flange (4). An anti-loosening spring (6) is provided in the spring groove (5). A pressure plate (7) is provided on the upper end of the anti-loosening spring (6). The lower end of the anti-loosening spring (6) is fixed in the spring groove (5). A lower fixing hole (8) penetrating the lower explosion-proof flange (4) is provided on the bottom surface of the spring groove (5). When no bolt connection is made, the pressure plate (7) is pushed out of the spring groove (5) by the anti-loosening spring (6). When bolt connection is made, the bolt presses the pressure plate (7) into the spring groove (5).

2. The high-voltage explosion-proof electric heater according to claim 1, characterized in that: The heater cylinder (2) is provided with a heater flange (9) at the top end, and the heater flange (9) is fixedly connected to the lower explosion-proof flange (4).

3. The high-voltage explosion-proof electric heater according to claim 1, characterized in that: The bottom surface of the lower explosion-proof flange (4) is provided with a sealing groove (10), and a lower sealing ring (11) is provided in the sealing groove (10).

4. A high-voltage explosion-proof electric heater according to claim 1, characterized in that: The lower explosion-proof flange (4) has a pressure plate groove (12) at the top of the spring groove (5), and both the pressure plate (7) and the pressure plate groove (12) are hexagonal structures.

5. A high-voltage explosion-proof electric heater according to claim 1, characterized in that: The explosion-proof junction box (1) is provided with an upper explosion-proof flange (13) at its upper end. A junction box cover (14) is connected to the upper explosion-proof flange (13). An upper sealing ring (15) is provided between the upper explosion-proof flange (13) and the junction box cover (14).

6. A high-voltage explosion-proof electric heater according to claim 5, characterized in that: The bottom surface of the upper explosion-proof flange (13) is provided with a spring tube (16), and a damping spring (17) is provided inside the spring tube (16). One end of the damping spring (17) is fixed on the upper explosion-proof flange (13), and the other end of the damping spring (17) is provided with a buffer column (18). The top surface of the lower explosion-proof flange (4) is provided with a plug tube (19), and the bottom end of the buffer column (18) is inserted into the plug tube (19).

7. A high-voltage explosion-proof electric heater according to claim 1, characterized in that: The inner wall of the heater cylinder (2) has multiple guide grooves (20) arranged around its circumference at the top end, and the outer wall of the explosion-proof junction box (1) has multiple guide strips (21) arranged around its circumference at the bottom end, and the bottom end of the explosion-proof junction box (1) is inserted into the heater cylinder (2).

8. A high-voltage explosion-proof electric heater according to claim 1, characterized in that: The heater cylinder (2) is provided with a perforated plate (22) for fixing the heating tube (3).

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