Anti-aging silicon nitride electric heating element

Abstract

The utility model relates to the technical field of electric heating elements, in particular to an anti-aging silicon nitride electric heating element which comprises a silicon nitride ceramic base body, electric heating wires are distributed in the silicon nitride ceramic base body in a snakelike mode, the two ends of each electric heating wire are fixedly connected with conductive heads respectively, a fixing sleeve is arranged at the rear end of the silicon nitride ceramic base body in a sleeved mode, and the silicon nitride ceramic base body is fixedly connected with the conductive heads. Conductive sleeves are fixedly connected to the left end and the right end of the interior of the fixed sleeve, electrode wires are fixedly connected to the rear ends of the two conductive sleeves, a control box is fixedly connected to the front end of the top of the fixed sleeve, and movable plates are slidably connected to the left end and the right end of the control box; according to the utility model, through the design, the phenomenon that the silicon nitride ceramic base body is cracked due to concentrated thermal stress and uneven heating can be avoided, so that the anti-aging effect of the silicon nitride ceramic base body is improved, meanwhile, the silicon nitride ceramic base body can be independently replaced after being aged and damaged, and the use cost is further reduced.

Description

Technical Field

[0001] This utility model relates to the field of electric heating element technology, specifically to an aging-resistant silicon nitride electric heating element. Background Technology

[0002] Silicon nitride heating elements are widely used in liquid heating due to their high thermal efficiency, good electrical safety performance, and rapid heating. Silicon nitride heating elements mainly consist of a silicon nitride substrate and a heating wire located inside the silicon nitride substrate.

[0003] A search revealed that CN213783618U discloses a silicon nitride electric heating element, comprising a heat transfer body, a front shell, and a bottom frame. The front shell is disposed above the heat transfer body, and an electric heating film is disposed above both the front shell and the heat transfer body. The bottom frame is disposed on one side below the electric heating film. The front shell and the heat transfer body are connected by a slot. The electric heating film is bonded to both the heat transfer body and the front shell. The bottom frame is connected to the heat transfer body by a slot.

[0004] The above-mentioned utility model increases the heat transfer efficiency of the heating element by setting an electric heating film. However, in actual use, due to the relatively thick silicon nitride and the limited distribution area of ​​the electric heating wire inside the silicon nitride, as well as the relatively thin electric heating wire, the thermal stress near the electric heating wire is significantly higher than that of the surrounding area when the electric heating wire is heating. This results in uneven heating inside the silicon nitride, which easily leads to cracking and accelerates the aging of the heating element.

[0005] Therefore, it is of great importance to design an aging-resistant silicon nitride heating element to solve the above-mentioned defects. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention designs an aging-resistant silicon nitride heating element. This silicon nitride heating element aims to solve the technical problem of uneven internal heating and easy aging of existing silicon nitride heating elements.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An aging-resistant silicon nitride heating element includes a silicon nitride ceramic substrate. Heating wires are arranged in a serpentine pattern inside the silicon nitride ceramic substrate. Conductive heads are fixedly connected to both ends of the heating wires. A fixing sleeve is fitted around the rear end of the silicon nitride ceramic substrate. Conductive sleeves are fixedly connected to both the left and right ends inside the fixing sleeve. Electrode wires are fixedly connected to the rear ends of both sets of conductive sleeves. A control box is fixedly connected to the front end of the top of the fixing sleeve. Movable plates are slidably connected to both the left and right ends of the control box. Each set of movable plates is inserted into the silicon nitride ceramic substrate via two sets of locking pins on opposite sides.

[0009] As a preferred embodiment of this utility model, an electrothermal film is provided around the silicon nitride ceramic substrate, and a locking hole is provided on the left and right sides of the silicon nitride ceramic substrate at the position corresponding to the locking post.

[0010] As a preferred embodiment of this utility model, fastening strips are movably connected to both the upper and lower sides inside the fixed sleeve. The opposite sides of the two sets of fastening strips abut against the silicon nitride ceramic substrate, and the opposite sides of the two sets of fastening strips are fixedly connected to the fixed sleeve by multiple sets of springs.

[0011] As a preferred embodiment of this utility model, the rear end of the conductive head is inserted into the interior of the conductive sleeve, and an insulating sleeve is provided on the outer side of both sets of electrode wires.

[0012] As a preferred embodiment of this utility model, two sets of movable racks are symmetrically slidably connected inside the control box, and a drive gear is rotatably connected in the middle of the control box. Both sets of movable racks mesh with the drive gear, and the ends of the two sets of movable racks that are far apart are fixedly connected to the movable plate. An operation knob is fixedly installed on the central shaft of the drive gear.

[0013] As a preferred embodiment of this utility model, the control box is equipped with guide rails inside both sets of moving racks, and guide wheels are rotatably connected to both ends of the two sets of moving racks on the inner side of the guide rails.

[0014] As a preferred embodiment of this utility model, a fixing block is fixedly connected to the outside of the operating knob, and a fixing screw is threadedly connected to the inside of the fixing block, with the bottom end of the fixing screw abutting against the top end of the control box.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. In this utility model, through the design of the silicon nitride ceramic substrate and the electric heating wire, the electric heating wire is distributed in a serpentine shape inside the silicon nitride ceramic substrate. When the electric heating wire heats, it can heat the inside of the silicon nitride ceramic substrate evenly, which can avoid the phenomenon of cracking of the silicon nitride ceramic substrate caused by uneven heating due to thermal stress concentration, thereby improving the aging resistance of the silicon nitride ceramic substrate.

[0017] 2. In this utility model, through the cooperative design of the silicon nitride ceramic substrate, the fixed sleeve, the control box, the movable plate, and the locking post, when assembling the silicon nitride ceramic substrate and the fixed sleeve, rotating the operating knob on the top of the control box drives the drive gear to rotate. Under the transmission of the drive gear, the two sets of moving racks move synchronously. The moving racks synchronously drive the two sets of movable plates to open, and the locking post moves accordingly to make room so that the silicon nitride ceramic substrate can be inserted into the interior of the fixed sleeve. Then, rotating the operating knob in the opposite direction puts the locking post into the locking hole on the outside of the silicon nitride ceramic substrate, connecting and fixing the silicon nitride ceramic substrate and the fixed sleeve. This facilitates the assembly of the silicon nitride ceramic substrate and the fixed sleeve, and also makes it easy to replace the silicon nitride ceramic substrate separately after it ages and is damaged, further reducing the cost of use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a schematic diagram of the electric heating wire structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the fixing sleeve of this utility model;

[0021] Figure 4 This is a schematic diagram of the fastening strip structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the control box structure of this utility model;

[0023] Figure 6 This is a schematic diagram of the internal structure of the control box of this utility model.

[0024] In the diagram: 1. Silicon nitride ceramic substrate; 101. Heating film; 102. Locking socket; 2. Heating wire; 3. Conductive head; 4. Fixing sleeve; 401. Fastening strip; 402. Spring; 5. Conductive sleeve; 6. Electrode wire; 601. Insulating sleeve; 7. Control box; 701. Moving rack; 702. Drive gear; 703. Operating knob; 704. Guide rail; 705. Guide wheel; 706. Fixing block; 707. Fixing screw; 8. Movable plate; 9. Locking post. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0026] Example: Please refer to Figures 1-6 This utility model provides a technical solution:

[0027] An aging-resistant silicon nitride heating element includes a silicon nitride ceramic substrate 1. Heating wires 2 are arranged in a serpentine pattern inside the silicon nitride ceramic substrate 1. Conductive heads 3 are fixedly connected to both ends of the heating wires 2. A fixing sleeve 4 is fitted onto the rear end of the silicon nitride ceramic substrate 1. Conductive sleeves 5 are fixedly connected to both the left and right ends inside the fixing sleeve 4. Electrode wires 6 are fixedly connected to the rear ends of both sets of conductive sleeves 5. A control box 7 is fixedly connected to the front end of the top of the fixing sleeve 4. Movable plates 8 are slidably connected to both the left and right ends of the control box 7. The opposite sides of the two sets of movable plates 8 are inserted into the silicon nitride ceramic substrate 1 via two sets of locking pins 9.

[0028] First, an electric heating film 101 is provided around the silicon nitride ceramic substrate 1. Locking holes 102 are provided on the left and right sides of the silicon nitride ceramic substrate 1 at positions corresponding to the locking posts 9. The electric heating wire 2 is distributed in a serpentine pattern inside the silicon nitride ceramic substrate 1. When the electric heating wire 2 heats, it can heat the inside of the silicon nitride ceramic substrate 1 evenly, which can avoid the phenomenon of cracking of the silicon nitride ceramic substrate 1 due to uneven heating caused by thermal stress concentration. This improves the aging resistance of the silicon nitride ceramic substrate 1. At the same time, the electric heating film 101 on the outside can effectively improve the heat transfer efficiency. After the fixing sleeve 4 is assembled with the silicon nitride ceramic substrate 1, the locking post 9 is inserted into the locking hole 102 on the outside of the silicon nitride ceramic substrate 1 to connect and fix the silicon nitride ceramic substrate 1 and the fixing sleeve 4.

[0029] Furthermore, fastening strips 401 are movably connected to both the upper and lower sides inside the fixing sleeve 4. The opposite sides of the two sets of fastening strips 401 abut against the silicon nitride ceramic substrate 1, and the opposite sides of the two sets of fastening strips 401 are fixedly connected to the fixing sleeve 4 by multiple sets of springs 402. When assembling the silicon nitride ceramic substrate 1 and the fixing sleeve 4, when the rear end of the silicon nitride ceramic substrate 1 is inserted into the interior of the fixing sleeve 4, the fastening strips 401 can move into the interior of the fixing sleeve 4 to allow the silicon nitride ceramic substrate 1 to be inserted. After the silicon nitride ceramic substrate 1 and the fixing sleeve 4 are connected and fixed, the multiple sets of springs 402 always push the fastening strips 401 to abut against the outer side of the silicon nitride ceramic substrate 1, further improving the firmness of the connection.

[0030] Then, the rear end of the conductive head 3 is inserted into the interior of the conductive sleeve 5. Insulating sleeves 601 are provided on the outer sides of both sets of electrode wires 6. When assembling the silicon nitride ceramic substrate 1 and the fixing sleeve 4, after the silicon nitride ceramic substrate 1 is inserted into the interior of the fixing sleeve 4, the conductive head 3 is automatically inserted into the interior of the conductive sleeve 5 and thus connected to the electrode wires 6. The insulating sleeves 601 can provide insulation protection for the outer side of the electrode wires 6.

[0031] Furthermore, two sets of sliding racks 701 are symmetrically slidably connected inside the control box 7. A drive gear 702 is rotatably connected in the middle of the control box 7, and both sets of sliding racks 701 mesh with the drive gear 702. The ends of the two sets of sliding racks 701 that are far apart are fixedly connected to the movable plate 8. An operating knob 703 is fixedly installed on the central shaft of the drive gear 702. When assembling the silicon nitride ceramic substrate 1 and the fixed sleeve 4, rotating the operating knob 703 on the top of the control box 7 drives the drive gear 702 to rotate, which in turn drives the two sets of sliding racks 701 to rotate. The moving rack 701 moves synchronously, which drives the two sets of movable plates 8 to open. The locking pin 9 moves accordingly to make room for the silicon nitride ceramic substrate 1 to be inserted into the fixed sleeve 4. Then, the operating knob 703 is rotated in the opposite direction to lock the locking pin 9 into the locking hole 102 on the outside of the silicon nitride ceramic substrate 1, thus connecting and fixing the silicon nitride ceramic substrate 1 and the fixed sleeve 4. This facilitates the assembly of the silicon nitride ceramic substrate 1 and the fixed sleeve 4, and also makes it easy to replace the silicon nitride ceramic substrate 1 separately after it ages and is damaged, further reducing the cost of use.

[0032] Secondly, guide rails 704 are installed inside the control box 7 and on the inner side of the two sets of moving racks 701. Guide wheels 705 are rotatably connected to both ends of the two sets of moving racks 701 on the inner side of the guide rails 704. When the moving racks 701 are moved, the guide wheels 705 roll inside the guide rails 704, thereby ensuring the stability of the moving racks 701.

[0033] Finally, a fixing block 706 is fixedly connected to the outside of the operating knob 703. A fixing screw 707 is connected to the inside of the fixing block 706. The bottom end of the fixing screw 707 abuts against the top end of the control box 7. After the operating knob 703 is rotated to connect and fix the silicon nitride ceramic substrate 1 and the fixing sleeve 4, the fixing screw 707 is screwed down so that its bottom end abuts against the top of the control box 7, thereby preventing the operating knob 703 from rotating and further ensuring the firmness of the connection and fixation between the silicon nitride ceramic substrate 1 and the fixing sleeve 4.

[0034] In this embodiment, the specific implementation scenario is as follows: When assembling the silicon nitride ceramic substrate 1 and the fixing sleeve 4, rotating the operation knob 703 on the top of the control box 7 drives the drive gear 702 to rotate. Under the transmission of the drive gear 702, the two sets of moving racks 701 move synchronously. The moving racks 701 synchronously drive the two sets of movable plates 8 to open, and the locking pin 9 moves to make room so that the silicon nitride ceramic substrate 1 can be inserted into the fixing sleeve 4. Then, rotating the operation knob 703 in the opposite direction moves the locking pin 9 into the locking hole 102 on the outside of the silicon nitride ceramic substrate 1, connecting and fixing the silicon nitride ceramic substrate 1 and the fixing sleeve 4. This facilitates the assembly of the silicon nitride ceramic substrate 1 and the fixing sleeve 4, and also facilitates the replacement of the silicon nitride ceramic substrate 1 after it ages and is damaged. The silicon nitride ceramic substrate 1 is then inserted into the fixing sleeve. After the conductive head 3 is inserted into the conductive sleeve 5, it connects to the electrode wire 6. The heating wire 2 is distributed in a serpentine pattern inside the silicon nitride ceramic substrate 1. When the heating wire 2 heats, it can evenly heat the inside of the silicon nitride ceramic substrate 1, avoiding the phenomenon of cracking of the silicon nitride ceramic substrate 1 due to uneven heating caused by thermal stress concentration. This improves the aging resistance of the silicon nitride ceramic substrate 1. At the same time, the outer heating film 101 can effectively improve the heat transfer efficiency. The whole operation process is simple and convenient. Compared with the existing silicon nitride electric heating elements, this utility model can avoid the phenomenon of cracking of the silicon nitride ceramic substrate 1 due to uneven heating caused by thermal stress concentration, thereby improving the aging resistance of the silicon nitride ceramic substrate 1. At the same time, the silicon nitride ceramic substrate 1 can be replaced separately after aging and damage, further reducing the cost of use.

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

Claims

1. An aging-resistant silicon nitride heating element, comprising a silicon nitride ceramic substrate (1), characterized in that: The silicon nitride ceramic substrate (1) has electric heating wires (2) arranged in a serpentine pattern inside. The two ends of the electric heating wires (2) are respectively fixedly connected to conductive heads (3). The rear end of the silicon nitride ceramic substrate (1) is fitted with a fixing sleeve (4). The left and right ends of the fixing sleeve (4) are fixedly connected to conductive sleeves (5). The rear ends of the two sets of conductive sleeves (5) are fixedly connected to electrode wires (6). The front end of the top of the fixing sleeve (4) is fixedly connected to a control box (7). The left and right ends of the control box (7) are slidably connected to movable plates (8). The opposite sides of the two sets of movable plates (8) are inserted into the silicon nitride ceramic substrate (1) through two sets of locking pins (9).

2. The aging-resistant silicon nitride heating element according to claim 1, characterized in that: The silicon nitride ceramic substrate (1) is provided with an electrothermal film (101) around its perimeter, and a locking hole (102) is provided on both the left and right sides of the silicon nitride ceramic substrate (1) at the position corresponding to the locking post (9).

3. The aging-resistant silicon nitride heating element according to claim 1, characterized in that: Fastening strips (401) are movably connected to both the upper and lower sides inside the fixed sleeve (4). The opposite sides of the two sets of fastening strips (401) abut against the silicon nitride ceramic substrate (1), and the opposite sides of the two sets of fastening strips (401) are fixedly connected to the fixed sleeve (4) by multiple sets of springs (402).

4. The aging-resistant silicon nitride heating element according to claim 1, characterized in that: The rear end of the conductive head (3) is inserted into the interior of the conductive sleeve (5), and the outer sides of both sets of electrode wires (6) are covered with insulating sleeves (601).

5. The aging-resistant silicon nitride heating element according to claim 1, characterized in that: The control box (7) has two sets of sliding racks (701) symmetrically connected inside. A drive gear (702) is rotatably connected in the middle of the control box (7). Both sets of sliding racks (701) mesh with the drive gear (702). The ends of the two sets of sliding racks (701) that are far apart are fixedly connected to the movable plate (8). An operation knob (703) is fixedly installed on the central shaft of the drive gear (702).

6. The aging-resistant silicon nitride heating element according to claim 5, characterized in that: Inside the control box (7) and on the inner side of the two sets of moving racks (701), guide rails (704) are installed. The two ends of the two sets of moving racks (701) are rotatably connected to guide wheels (705) on the inner side of the guide rails (704).

7. The aging-resistant silicon nitride heating element according to claim 5, characterized in that: A fixing block (706) is fixedly connected to the outside of the operating knob (703), and a fixing screw (707) is threadedly connected inside the fixing block (706), with the bottom end of the fixing screw (707) abutting against the top end of the control box (7).

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