Electric heating element fixing device and air duct heater

Abstract

The utility model discloses an electric heating element fixing device and an air duct heater. The electric heating element fixing device comprises a cylindrical shell and at least one elastic sheet arranged in the shell. The shell is provided with a first end and a second end which are opposite to each other, and the end part of the first end is opened to form an opening of the shell; one end of the elastic piece is fixedly connected to the inner wall face of the shell, and the other opposite end of the elastic piece extends in the direction of the opening and can be close to the inner wall face of the shell or away from the inner wall face of the shell. A fixing face used for abutting against an electric heating element is formed on the surface, back on to the inner wall face of the shell, of the elastic piece. The electric heating element fixing device is used for fixing the electric heating element through the arrangement of the cylindrical shell and the internal elastic piece, the structure is simple, the electric heating element is convenient to disassemble and assemble, the problem that the end of the electric heating element vibrates due to turbulence in the using process is solved, and the probability that the electric heating element is damaged due to vibration and collision is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of heaters, in particular to an electric heating element fixing device and an air duct heater. Background Art

[0002] The quick-detachable duct electric heater uses a single-head tube as the electric heating element, which is convenient for replacing the electric heating element without removing the heater frame from the duct. However, during the maintenance of the quick-detachable duct electric heater used in nuclear power plants, it was found that the electric heating element was easily affected by turbulent flow during operation, resulting in large vibrations. The vibration of the electric heating element during operation will not only produce abnormal noise, but the high-frequency dry friction between the metal shell of the electric heating element and the frame will also damage the electric heating tube, affecting the service life of the electric heater.

[0003] Through the study of related issues, it is found that the electric heating element has a fixation problem. The electric heater is at high temperature and accompanied by strong wind flow during use. The wind passing through the air duct and constantly blowing towards the electric heater will cause the electric heating element of the electric heater to vibrate continuously, thereby causing deformation, damage and other problems of the electric heating element. The constant vibration of the electric heating element is also accompanied by huge noise, which will cause the on-site personnel to be unable to judge the operating status of the electric heater by sound and may even make wrong judgments, resulting in the inability to carry out work normally or increasing invalid workload.

[0004] By studying various types of duct-type electric heaters and past maintenance experiences, and after analyzing and simulating the operating conditions of electric heaters, it was found that almost all duct-type electric heaters will have loose heating elements and vibrations after a period of use, which increases the probability of damage to the heating elements. The accompanying noise has also become a major factor affecting the implementation of normal operation. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an electric heating element fixing device and an air duct heater.

[0006] The technical solution adopted by the utility model to solve the technical problem is: to provide an electric heating element fixing device, comprising a cylindrical shell for inserting one end of the electric heating element therein, and at least one spring piece arranged in the shell;

[0007] The housing has a first end and a second end opposite to each other, and an end of the first end is open to form an opening of the housing;

[0008] The spring sheet is curved in an arc shape, one end of the spring sheet is fixedly connected to the inner wall surface of the shell, and the other end of the spring sheet extends toward the opening direction, and can be close to the inner wall surface of the shell or away from the inner wall surface of the shell; the surface of the spring sheet facing away from the inner wall surface of the shell forms a fixed surface for abutting the electric heating element.

[0009] In some embodiments, the housing is a stainless steel cylinder.

[0010] In some embodiments, the second end of the shell is open, and one end of the elastic sheet connected to the inner wall of the shell is flush with or spaced apart from the end surface of the second end.

[0011] In some embodiments, the second end of the housing is closed.

[0012] In some embodiments, the spring piece is C-shaped.

[0013] In some embodiments, one end of the elastic sheet is connected to the inner wall surface of the shell by welding.

[0014] In some embodiments, the electric heating element fixing device includes at least two elastic sheets, and the at least two elastic sheets are distributed in the shell along the circumference of the shell.

[0015] The utility model also provides an air duct heater, comprising a frame, a junction box, a plurality of electric heating elements and a plurality of electric heating element fixing devices as described in any one of the above items;

[0016] The junction box is arranged on one side of the frame, and a plurality of the electric heating element fixing devices are arranged in the frame at intervals and opposite to the junction box; a plurality of the electric heating elements are arranged in the frame at intervals, and one end of each of the electric heating elements is plugged into the junction box, and the other end is plugged into the electric heating element fixing device.

[0017] In some embodiments, the housing of the electric heating element fixing device is fixed in the frame by welding.

[0018] The electric heating element fixing device of the utility model is used to fix the electric heating element by setting a cylindrical shell and an internal spring piece. It has a simple structure and is convenient for disassembly and assembly of the electric heating element. It solves the problem of end vibration of the electric heating element caused by turbulent flow during use, and reduces the probability of damage to the electric heating element due to vibration and collision. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0020] Figure 1 This is a schematic structural diagram of an electric heating element fixing device according to an embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of the axial cross-section structure of an electric heating element fixing device according to one embodiment of the utility model;

[0022] Figure 3It is a structural schematic diagram of an air duct heater according to an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to have a clearer understanding of the technical features, purposes and effects of the present utility model, the specific implementation methods of the present utility model are now described in detail with reference to the accompanying drawings.

[0024] The electric heating element fixing device of the utility model is used for fixing the electric heating element and has a shockproof effect. For example, the electric heating element is fixed in a frame and the disassembly and assembly of the electric heating element is convenient.

[0025] like Figure 1 , Figure 2 As shown, a fixing device for an electric heating element according to an embodiment of the present invention may include a cylindrical housing 10 and at least one elastic piece 20 disposed in the housing 10 .

[0026] The housing 10 is used to insert one end of the electric heating element therein. The spring piece 20 has deformable and restorable elasticity, and can use its own elasticity to clamp the electric heating element in the housing 10 , while also facilitating the release of the electric heating element so that the electric heating element can be pulled out of the housing 10 .

[0027] Structurally, the housing 10 has a first end 11 and a second end 12 opposite to each other. The end of the first end 11 is open to form an opening of the housing 10. One end of the electric heating element is inserted into the housing 10 from the opening and is fixed in the housing 10 by the clamping of the spring 20.

[0028] Alternatively, the second end 12 of the housing 10 may be open or closed.

[0029] The housing 10 is preferably a stainless steel cylinder, which has certain structural strength and good corrosion resistance, a long service life, and is convenient to be fixed to a frame or other parts used to assemble the electric heating element by welding or other means.

[0030] The shape of the housing 10 can be set according to the electric heating element. For example, for a cylindrical electric heating element, the housing 10 is a cylindrical structure; for a square column or other polygonal column electric heating element, the housing 10 is a square or other polygonal cylinder. In terms of the inner circumference, the housing 10 is slightly larger than the outer circumference of the electric heating element to facilitate the insertion or removal of the electric heating element. The shape and size of the housing 10 can be set according to the electric heating element to be fixed, and is suitable for electric heating elements of various specifications.

[0031] The spring piece 20 is curved, so that the spring piece 20 can be, but is not limited to, C-shaped in length. In the housing 10 , the spring piece 20 is mainly disposed in the second end 12 of the housing 10 , and the arc-shaped protrusion of the spring piece 20 faces the center line direction of the housing 10 .

[0032] One end 21 of the spring sheet 20 can be fixedly connected to the inner wall surface of the housing 10 by welding or the like, and the other end 22 of the spring sheet 20 extends toward the opening direction of the housing 10 and is not connected to the inner wall surface of the housing 10. Since the spring sheet 20 has elastic deformation performance, the end 22 of the spring sheet 20 facing the opening can rotate relative to the end connected to the inner wall surface of the housing 10 under external force, so as to be close to the inner wall surface of the housing 10 or away from the inner wall surface of the housing 10.

[0033] The surface of the spring sheet 20 facing away from the inner wall of the housing 10 forms a fixing surface 23 for abutting against the electric heating element. When the electric heating element is inserted into the housing 10, it can abut against the spring sheet 20 and continue to be inserted along the length direction of the spring sheet 20 until it is in place. At the same time, the fixing surface 23 of the spring sheet 20 is pressed by the electric heating element to drive the spring sheet 20 to rotate toward the open end toward the inner wall of the housing 10. After the electric heating element is inserted into place, the spring sheet 20 presses against the outer surface of the electric heating element due to its own elastic restoring force.

[0034] When the electric heating element needs to be taken out, the electric heating element can be directly pulled out. After the electric heating element is separated from the housing 10, the spring piece 20 inside the housing 10 can be restored to the initial state (natural state).

[0035] The spring piece 20 plays an effective role in guiding and fixing the electric heating element for installation, which is conducive to the disassembly and assembly of the electric heating element. The spring piece 20 is made of metal material, which can be made of steel sheet, with high elasticity and strong resilience. The arc of the middle part is smooth, which minimizes the mechanical damage to the electric heating element during installation, and more effectively and conveniently solves the problems of fixing and secondary disassembly and assembly of the electric heating element.

[0036] In order to fix the electric heating element more stably in the housing 10, at least two spring pieces 20 are provided in the housing 10. At least two spring pieces 20 are distributed in the housing 10 along the circumference of the housing 10.

[0037] For example, when there are two spring sheets 20, the two spring sheets 20 are relatively arranged on two opposite inner sides of the housing 10. When there are four spring sheets 20, the four spring sheets 20 are evenly spaced and arranged in the housing 10; for a cylindrical housing 10, the angle between two adjacent spring sheets 20 is 90°.

[0038] In order to avoid interfering with the installation of the housing 10 on a frame or other parts, the spring sheet 20 is inside the second end 12 of the housing 10 and does not protrude outside the second end 12. For a housing 10 with an open second end 12, one end 21 of the spring sheet 20 connected to the inner wall surface of the housing 10 is flush with or spaced from the end surface of the second end 12. For a housing 10 with a closed second end 12, one end 21 of the spring sheet 20 connected to the inner wall surface of the housing 10 is spaced from or butted against the inner side of the second end 12.

[0039] The electric heating element fixing device of the utility model can be used for air duct heaters, especially quick-release air duct heaters. Figures 1 to 3 The air duct heater using the electric heating element fixing device may include a frame 30, a junction box 40, a plurality of electric heating elements 50 and a plurality of electric heating element fixing devices.

[0040] The junction box 40 is arranged on one side of the frame 30, and a plurality of electric heating element fixing devices are arranged in the frame 30 at intervals and opposite to the junction box 40. A plurality of electric heating elements 50 are arranged in the frame 30 at intervals, and one end of each electric heating element 50 is plugged into the junction box 40, and the other end is plugged into the electric heating element fixing device.

[0041] In the electric heating element fixing device, one end of the electric heating element 50 away from the junction box 40 is inserted into the housing 10 and is fixed by the spring sheet 20 in the housing 10 .

[0042] In some embodiments, the housing 10 of the electric heating element fixing device is fixed in the frame 30 by welding at its second end 12 .

[0043] The electric heating element fixing device is used to fix the electric heating element 50 of the air duct heater, and effectively solves the vibration of the electric heating element while maintaining the integrity of the air duct heater and the original design requirements.

[0044] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A device for fixing an electric heating element, characterized in that: It comprises a cylindrical shell into which one end of the electric heating element is inserted, and at least one spring piece arranged in the shell; The housing has a first end and a second end opposite to each other, and an end of the first end is open to form an opening of the housing; The spring sheet is curved in an arc shape, one end of the spring sheet is fixedly connected to the inner wall surface of the shell, and the other end of the spring sheet extends toward the opening direction, and can be close to the inner wall surface of the shell or away from the inner wall surface of the shell; the surface of the spring sheet facing away from the inner wall surface of the shell forms a fixed surface for abutting the electric heating element.

2. The electric heating element fixing device according to claim 1, characterized in that: The shell is a stainless steel cylinder.

3. The electric heating element fixing device according to claim 1, characterized in that: The second end of the shell is open, and one end of the elastic sheet connected to the inner wall of the shell is flush with or spaced from the end surface of the second end.

4. The electric heating element fixing device according to claim 1, characterized in that: The second end of the housing is closed.

5. The electric heating element fixing device according to claim 1, characterized in that: The spring piece is C-shaped.

6. The electric heating element fixing device according to claim 1, characterized in that: One end of the elastic sheet is connected to the inner wall surface of the shell by welding.

7. The electric heating element fixing device according to any one of claims 1 to 6, characterized in that: The electric heating element fixing device comprises at least two elastic sheets, and the at least two elastic sheets are distributed in the shell along the circumference of the shell.

8. A duct heater, characterized in that: It comprises a frame, a junction box, a plurality of electric heating elements and a plurality of electric heating element fixing devices according to any one of claims 1 to 7; The junction box is arranged on one side of the frame, and a plurality of the electric heating element fixing devices are arranged in the frame at intervals and opposite to the junction box; a plurality of the electric heating elements are arranged in the frame at intervals, and one end of each of the electric heating elements is plugged into the junction box, and the other end is plugged into the electric heating element fixing device.

9. The air duct heater according to claim 8, characterized in that: The shell of the electric heating element fixing device is fixed in the frame by welding.

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