Anti-explosion electric heater

Abstract

The utility model discloses an explosion-proof electric heater which comprises an explosion-proof control box, a plurality of fins installed on one side of the explosion-proof control box at equal intervals and a box cover arranged on the front face of the explosion-proof control box, the inner side wall of the explosion-proof control box is fixedly connected with a fixing piece, the fixing piece is provided with an avoiding groove, the inner side of the box cover is fixedly connected with a supporting frame, and the supporting frame is fixedly connected with the box cover. The supporting frame is in threaded connection with a screw rod, one end of the screw rod is provided with a transverse piece, the inner side wall of the box cover is fixedly connected with a positioning rod, the inner side of the explosion-proof control box is provided with a positioning hole matched with the positioning rod, the transverse piece is in sliding connection with the adjacent positioning rod, and a knob is rotationally installed on the explosion-proof control box. Through the arrangement of the screw rod, the transverse piece, the positioning rod, the fixing piece, the supporting frame, the rotary knob and the avoiding groove, the box cover can be installed and fixed only by rotating the rotary knob, a large number of screws do not need to be screwed, only the rotary knob needs to be rotated when the box cover is disassembled, and therefore the disassembling and assembling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heaters, in particular to an explosion-proof electric heater. Background Art

[0002] Explosion-proof electric heaters are suitable for places with explosive gas hazards. They use whole-machine explosion-proof technology, which can effectively prevent the ignition of gas and dust in the surrounding environment due to electric arcs, sparks and high temperatures. They are mainly composed of a flameproof control box and fins. The fins are equipped with heat transfer oil and heating wires. The principle is that when the power is turned on, the heat transfer oil around the heating wire is heated and rises to the upper part of the fin cavity, circulates along the fins, and radiates heat through the fin surface, thereby heating the space environment. The flameproof control box is also equipped with gear selection switches, temperature control switches, fuses, anti-dump switches and other equipment for temperature control to improve safety.

[0003] At present, when repairing the equipment inside the flameproof control box, it is necessary to remove the box cover of the flameproof control box, and the box cover is fixed by a large number of screws. The installation and removal steps are very cumbersome, the disassembly and assembly efficiency is low, and it is inconvenient for the staff to perform maintenance. Utility Model Content

[0004] The purpose of the utility model is to provide an explosion-proof electric heater to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an explosion-proof electric heater, comprising a flameproof control box, a plurality of fins equidistantly installed on one side of the flameproof control box, and a box cover arranged on the front of the flameproof control box, the inner side wall of the flameproof control box is fixedly connected with a fixing plate, the fixing plate is provided with an avoidance groove, the inner side of the box cover is fixedly connected with a support frame, the support frame is threadedly connected with a screw, one end of the screw is provided with a cross piece, the inner side wall of the box cover is fixedly connected with a positioning rod, the inner side of the flameproof control box is provided with a positioning hole matching the positioning rod, the cross piece is slidably connected to the adjacent positioning rod, a knob is rotatably installed on the flameproof control box, one end of the screw is provided with a transmission block, and the inside of the knob is provided with a slide groove matching the transmission block.

[0006] As a preferred solution of the utility model, the outer side of the screw is fixedly connected to a limiting block.

[0007] As a preferred solution of the utility model, a contraction portion is provided at one end of the screw rod, and the screw rod is rotatably connected to the transverse piece via the contraction portion.

[0008] As a preferred solution of the utility model, a limiting cylinder is provided at one end of the knob, the knob is rotatably connected to the box cover through the limiting cylinder, and a sealing ring is provided on one side of the limiting cylinder.

[0009] As a preferred solution of the utility model, a groove is provided on the outer side of the knob, and a mark is provided on the outer side of the box cover.

[0010] As a preferred solution of the utility model, a sealing strip is installed on the flameproof control box, and a sealing groove matching with the sealing strip is provided on one side of the box cover.

[0011] As a preferred solution of the utility model, an anti-dumping switch is installed inside the flameproof control box.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model, through the provision of the screw, cross piece, positioning rod, fixing piece, support frame, knob and avoidance groove, makes it possible to install and fix the box cover only by turning the knob, without the need to screw a large number of screws; when removing the box cover, it is also only necessary to turn the knob, thereby improving the disassembly and assembly efficiency; and the provision of the sealing ring can improve the sealing between the limit cylinder and the box cover, thereby preventing flammable and explosive gases or dust from entering the box cover, thereby improving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the utility model after the box cover is disassembled;

[0015] Figure 3 For this utility model Figure 2 The enlarged view of point A in the middle;

[0016] Figure 4 This is a schematic diagram of the structure of the box cover of the utility model;

[0017] Figure 5 It is a side sectional view of the box cover of the utility model;

[0018] Figure 6 For this utility model Figure 5 The enlarged view of point B in the middle;

[0019] Figure 7 It is a structural schematic diagram of the screw rod of the utility model;

[0020] Figure 8 It is a structural schematic diagram of the knob of the utility model;

[0021] Fig. 9 It is a structural schematic diagram of the chute of the utility model.

[0022] In the figure: 1. explosion-proof control box; 2. box cover; 3. fin; 4. knob; 5. mark; 6. sealing strip; 7. fixing plate; 8. positioning hole; 9. avoidance groove; 10. anti-dumping switch; 11. sealing groove; 12. positioning rod; 13. screw; 14. cross piece; 15. groove; 16. support frame; 17. limit cylinder; 18. slide groove; 19. sealing ring; 20. limit block; 21. contraction part; 22. transmission block. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figures 1 to 9The utility model provides a technical solution: an explosion-proof electric heater, including a flameproof control box 1, and temperature control switches, fuses, gear selection switches and other devices are also installed in the flameproof control box 1. The temperature control switch, fuses, gear selection switches and other devices are existing technologies, so they are not described in detail. A plurality of fins 3 are equidistantly installed on one side of the flameproof control box 1, a heating tube is installed below the inside of the fin 3, and a box cover 2 is arranged on the front of the flameproof control box 1. The inner side wall of the flameproof control box 1 is fixedly connected with a fixing plate 7. When the box cover 2 is installed, the screw 13 is rotated by the knob 4. Since the screw rod 13 is threadedly connected to the support frame 16, the screw rod 13 will move, and the screw rod 13 drives the cross piece 14 to move in the direction close to the box cover 2. When the cross piece 14 is tightly attached to the fixing piece 7 so that the knob 4 cannot be rotated, the box cover 2 is tightly attached to the flameproof control box 1, and the positioning rod 12 is inserted into the positioning hole 8. The fixing piece 7 and the cross piece 14 cooperate to limit the forward and backward movement between the box cover 2 and the flameproof control box 1, and the positioning rod 12 and the positioning hole 8 can limit the upward, downward, left and right movement between the box cover 2 and the flameproof control box 1, thereby realizing the installation and fixation of the box cover 2. The box cover 2 can be installed by turning the knob 4, so that the installation steps are very simple. The fixing plate 7 is provided with an avoidance groove 9, which is used to avoid the positioning rod 12 to prevent the positioning rod 12 from being blocked by the fixing plate 7 and prevent the positioning rod 12 from being unable to align with the positioning hole 8. The inner side of the box cover 2 is fixedly connected with a support frame 16, and a screw 13 is threadedly connected to the support frame 16. The screw 13 is used to drive the cross piece 14 to move. One end of the screw 13 is provided with a cross piece 14. The inner side wall of the box cover 2 is fixedly connected with the positioning rod 12, and the inner side of the flameproof control box 1 is provided with a positioning rod 12 that matches the positioning rod 12. Hole 8, the positioning rod 12 cooperates with the positioning hole 8 to position the box cover 2 to prevent the box cover 2 from offsetting from the flameproof control box 1, the cross piece 14 is slidably connected to the adjacent positioning rod 12, and a knob 4 is rotatably installed on the flameproof control box 1. The knob 4 can drive the screw 13 to rotate through the transmission block 22. A transmission block 22 is provided at one end of the screw 13, and a slide groove 18 that cooperates with the transmission block 22 is provided inside the knob 4. The transmission block 22 and the screw 13 can slide in the slide groove 18 to prevent the transmission block 22 and the screw 13 from being blocked by the knob 4 and unable to move.

[0025] The outer side of the screw rod 13 is fixedly connected to a limit block 20 , which is used to limit the position of the screw rod 13 to prevent the screw rod 13 from moving too far, causing the screw rod 13 to separate from the support frame 16 , or causing the transmission block 22 to separate from the slide slot 18 .

[0026] One end of the screw rod 13 is provided with a contraction portion 21 , which allows the screw rod 13 to rotate with the cross piece 14 , and the screw rod 13 can also drive the cross piece 14 to move. The screw rod 13 is rotatably connected to the cross piece 14 via the contraction portion 21 .

[0027] Among them, a limiting cylinder 17 is provided at one end of the knob 4, and the limiting cylinder 17 is used to limit the knob 4 to prevent the knob 4 from being separated from the box cover 2. The knob 4 is rotatably connected to the box cover 2 through the limiting cylinder 17. A sealing ring 19 is provided on one side of the limiting cylinder 17, and the sealing ring 19 is used to improve the sealing between the limiting cylinder 17 and the box cover 2.

[0028] Among them, a groove 15 is provided on the outside of the knob 4, which is used to increase the friction between the knob 4 and the hand to prevent slipping when the knob 4 is turned. A mark 5 is provided on the outside of the box cover 2, which can help the staff to understand whether the knob 4 is unlocked or locked when it is turned.

[0029] A sealing strip 6 is installed on the flameproof control box 1 , and a sealing groove 11 matching with the sealing strip 6 is provided on one side of the box cover 2 . The sealing strip 6 is used to improve the sealing between the box cover 2 and the flameproof control box 1 .

[0030] Among them, an anti-dumping switch 10 is installed inside the explosion-proof control box 1. When the explosion-proof electric heater is accidentally knocked over, the anti-dumping switch 10 will immediately cut off the power supply of the heating tube in the fin 3, thereby improving safety.

[0031] Specifically, when installing the box cover 2, take the box cover 2 and bring it close to the flameproof control box 1, so that the cross piece 14 is on the rear side of the fixing piece 7, and then move the box cover 2 downward, and the positioning rod 12 adjacent to the cross piece 14 is inserted into the avoidance groove 9. When the positioning rod 12 moves to the bottom of the avoidance groove 9, the positioning rod 12 is just aligned with the positioning hole 8. At this time, due to the obstruction of the cross piece 14, the positioning rod 12 adjacent to the cross piece 14 cannot be inserted into the positioning hole 8, and the box cover 2 cannot be close to the flameproof control box 1. Then turn the knob 4, and the knob 4 rotates the screw 13 through the transmission block 22. Since the screw 13 is threadedly connected to the support frame 16, the screw 13 moves, and the screw 13 drives the cross piece 14 to move toward the direction close to the box cover 2. In this process, the positioning rod 12 adjacent to the cross piece 14 is gradually exposed. The positioning rod 12 can be gradually inserted into the positioning hole 8, and a thrust is applied to the box cover 2 by hand. With the movement of the cross piece 14, the box cover 2 gradually approaches the explosion-proof control box 1 until the box cover 2 fits with the explosion-proof control box 1, and the knob 4 is continued to be turned to make the cross piece 14 fit tightly with the fixing piece 7 until the knob 4 cannot be rotated. At this time, the fixing piece 7 and the cross piece 14 cooperate to limit the forward and backward movement between the box cover 2 and the explosion-proof control box 1, and the positioning rod 12 and the positioning hole 8 limit the upward, downward, left and right movement between the box cover 2 and the explosion-proof control box 1, thereby realizing the installation and fixation of the box cover 2. When the box cover 2 needs to be removed, it is only necessary to rotate the knob 4 in the opposite direction until the limit block 20 is blocked by the support frame 16, causing the knob 4 to be unable to rotate, and then the box cover 2 can be pushed upward, and the cross piece 14 leaves the rear side of the fixing piece 7, and the box cover 2 is removed.

[0032] In the description of the present invention, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "upper", "one side", "top", "inside", "front", "center", "both ends" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, the terms "first", "second", "third" and "fourth" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first", "second", "third" and "fourth" may explicitly or implicitly include at least one of such features.

[0034] In the present utility model, unless otherwise clearly stipulated and limited, the terms such as "installation", "setting", "connection", "fixation" and "screw-on" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. Unless otherwise clearly defined, ordinary technicians in this field can understand the specific meanings of the above terms in the utility model according to the specific circumstances.

[0035] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof electric heater, comprising a flameproof control box (1), a plurality of fins (3) equidistantly mounted on one side of the flameproof control box (1), and a box cover (2) arranged on the front of the flameproof control box (1), characterized in that: The inner side wall of the flameproof control box (1) is fixedly connected with a fixing plate (7), and an avoidance groove (9) is provided on the fixing plate (7). The inner side of the box cover (2) is fixedly connected with a support frame (16), and a screw rod (13) is threadedly connected to the support frame (16). One end of the screw rod (13) is provided with a transverse plate (14). The inner side wall of the box cover (2) is fixedly connected with a positioning rod (12). The inner side of the flameproof control box (1) is provided with a positioning hole (8) matching with the positioning rod (12), and the transverse plate (14) is slidably connected with the adjacent positioning rod (12). A knob (4) is rotatably mounted on the flameproof control box (1), and one end of the screw rod (13) is provided with a transmission block (22). The interior of the knob (4) is provided with a slide groove (18) matching with the transmission block (22).

2. An explosion-proof electric heater according to claim 1, characterized in that: The outer side of the screw rod (13) is fixedly connected to a limiting block (20).

3. The explosion-proof electric heater according to claim 1, characterized in that: A contraction portion (21) is provided at one end of the screw rod (13), and the screw rod (13) is rotatably connected to the transverse piece (14) via the contraction portion (21).

4. The explosion-proof electric heater according to claim 1, characterized in that: A limiting cylinder (17) is provided at one end of the knob (4), and the knob (4) is rotatably connected to the box cover (2) via the limiting cylinder (17). A sealing ring (19) is provided on one side of the limiting cylinder (17).

5. The explosion-proof electric heater according to claim 1, characterized in that: A groove (15) is provided on the outer side of the knob (4), and a mark (5) is provided on the outer side of the box cover (2).

6. The explosion-proof electric heater according to claim 1, characterized in that: A sealing strip (6) is installed on the flameproof control box (1), and a sealing groove (11) matching with the sealing strip (6) is provided on one side of the box cover (2).

7. The explosion-proof electric heater according to claim 1, characterized in that: An anti-dumping switch (10) is installed inside the flameproof control box (1).

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