High-temperature furnace with furnace wires convenient to replace

Abstract

The utility model belongs to the technical field of high-temperature furnaces, and particularly relates to a high-temperature furnace convenient for replacing furnace wires, which comprises a hearth, a plurality of through grooves and a heat insulation layer, wherein the hearth is internally provided with a containing cavity, and one end of the hearth is provided with an inlet; each through groove is formed in the circumferential direction of the hearth in a penetrating mode, the multiple through grooves are evenly distributed in the axial direction of the hearth, positioning grooves are formed in the portions, corresponding to the through grooves, of the outer side wall of the hearth, and the positioning grooves are annular spiral grooves matched with the spiral furnace wires. The positioning grooves are used for forcing the furnace wires to be wound along a preset screw pitch path when the furnace wires are installed, uniform distribution and positioning of the furnace wires on the hearth are achieved, local overheating or insufficient cooling caused by uneven intervals of the furnace wires is avoided, the temperature uniformity in the hearth is improved, meanwhile, the furnace wires installed in an open mode replace a traditional mode that the furnace wires are installed in the hearth, and the furnace wires can be installed more conveniently. And a worker can conveniently find and replace the damaged furnace wire.

Description

Technical Field

[0001] This utility model belongs to the field of high-temperature furnace technology, specifically relating to a high-temperature furnace that facilitates the replacement of furnace wires. Background Technology

[0002] A high-temperature furnace is a device used for material processing, experimentation, or industrial production in a high-temperature environment. A high-temperature furnace mainly consists of a furnace chamber with internal accommodating features, multiple slots on the furnace chamber for mounting spiral heating wires, and an insulation layer to reduce heat loss from the furnace chamber. Existing high-temperature furnaces are box-shaped, with a typically rectangular furnace chamber. Traditional high-temperature furnace designs usually involve mounting the heating wires inside the furnace chamber. While this design meets heating requirements to some extent, it has revealed numerous problems in practical use.

[0003] Difficulty in replacing heating wires: Since the heating wires are installed inside the furnace, once the heating wires are damaged, the staff needs to open the furnace to find and replace the damaged heating wires from the inside. This process is not only cumbersome and time-consuming, but also increases maintenance costs.

[0004] Uneven distribution of heating wires: The traditional heating wire installation method of high-temperature furnaces makes it difficult to ensure the uniform distribution of heating wires in the furnace chamber. It requires manual adjustment of the spacing of the heating wires, which is not only troublesome to operate, but also easy to cause local overheating or insufficient cooling, affecting the heating effect and the temperature uniformity in the furnace chamber.

[0005] Therefore, it is particularly important to develop a high-temperature furnace that is easy to replace heating wires, convenient to maintain, heats uniformly, and has an effective mechanism for detecting heating wire aging and breakage. Utility Model Content

[0006] To address the above problems, the purpose of this utility model is to provide a high-temperature furnace that facilitates the replacement of heating wires, thereby solving the problems mentioned in the background art, such as the difficulty in replacing heating wires and the inconvenience in disassembling the insulation layer in existing high-temperature furnaces.

[0007] This utility model provides a high-temperature furnace that facilitates the replacement of heating wires. It includes a furnace chamber with an internal accommodating cavity and an inlet at one end, multiple slots for installing spiral heating wires on the furnace chamber, and a heat insulation layer to reduce heat loss from the furnace chamber. Each slot extends through the furnace chamber circumferentially, and the multiple slots are evenly distributed along the furnace chamber's axial direction. A positioning groove is provided on the outer wall of the furnace chamber, corresponding to each slot. This positioning groove is an annular spiral groove that mates with the spiral heating wire. The positioning groove forces the heating wire to wind along a preset pitch path during installation, achieving uniform distribution and positioning of the heating wire on the furnace chamber.

[0008] Preferably, the heat insulation layer is a shell with internal heat insulation material, which covers the outside of the furnace and is detachably connected to the furnace.

[0009] Preferably, the shape of the furnace chamber includes, but is not limited to, a conical or cylindrical shape.

[0010] Preferably, the head and end of the heating element at each of the slots are detachably connected.

[0011] Preferably, the surface of the positioning groove wall is provided with a high-temperature resistant lubricating coating to reduce friction during furnace wire installation.

[0012] Preferably, a temperature sensor is provided at the connection between the head end and the end end of the heating element. The temperature sensor is electrically connected to an external control device to monitor the temperature at the connection of the heating element in real time and trigger an alarm when the temperature is abnormal.

[0013] The beneficial effects of this utility model are as follows: by setting a through groove on the outer wall of the furnace, the heating wire is wound around the outside of the furnace, which makes it easy to check the condition of the heating wire and to replace the heating wire when it is damaged. In addition, an annular spiral groove (positioning groove) is added at the through groove, which can be used to make the heating wire distributed on the furnace according to the pitch of the annular spiral groove when installing the heating wire, avoiding local overheating or insufficient cooling caused by uneven spacing of the heating wire, improving the temperature uniformity in the furnace, and the forced path design reduces the need for manual adjustment, improves installation efficiency, and reduces the risk of heating wire deformation or breakage.

[0014] The open-type heating coils replace the traditional method of installing the heating coils inside the furnace, making it easier for staff to find and replace damaged heating coils. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 3 This is a schematic diagram of the structure of the heat insulation layer separated from the furnace in this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of this utility model with the insulation layer and furnace wires removed.

[0019] In the diagram: 1. Receiving chamber; 2. Inlet; 3. Furnace chamber; 4. Spiral heating wire; 5. Insulation layer; 6. Through slot; 7. Positioning slot; 8. Shell; 9. Bolt; 10. Channel. Detailed Implementation

[0020] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory, and should not be used to limit the scope of protection of this utility model in any way.

[0021] The existing high-temperature furnace of this utility model mainly includes a furnace chamber 3 with an internal accommodating chamber 1 and an inlet 2 at one end, multiple slots 6 on the furnace chamber 3 for installing spiral heating wires 4, and a heat insulation layer 5 for reducing heat loss inside the furnace chamber 3. The furnace chamber 3 is usually rectangular, and the shape of the high-temperature furnace is similar to a box, which is a traditional muffle furnace. The door is located at the front and can be opened outwards. There is also a door stopper inside the door (not shown in the figure). The slots 6 are opened inside the furnace chamber 3. The heating wires 4 are spiral. During installation, the heating wires 4 are passed into the slots 6. High-temperature resistant metal hooks or ceramic hooks can be installed on the inner wall of the furnace chamber 3. The free end of the heating wires 4 can be bent into a suitable shape and hung on the hooks. The heat insulation layer 5 is installed inside the furnace chamber 3. In the prior art, the heat insulation layer 5 is heat insulation cotton. In order to reduce the rate of heat loss from the furnace chamber 3, the above is an introduction to the existing high-temperature furnace.

[0022] As can be seen from the above, the existing high-temperature furnace has the following defects when in use: First, because the heating wire 4 is threaded into the groove 6, it is not convenient to find the damaged part of the heating wire 4, and it is troublesome to replace it and difficult to install and remove it; Second, because the heat insulation layer 5 is located inside the furnace chamber 3, when repairing and replacing the high-temperature furnace chamber 3, all the loose heat insulation cotton needs to be removed, which is labor-intensive and produces a lot of dust. Based on the above problems, this utility model adopts the following improvement method to solve them.

[0023] like Figure 1-4As shown, a high-temperature furnace that facilitates the replacement of heating wire 4 differs from existing technologies in that the rectangular furnace chamber 3 is replaced with a cylindrical or conical furnace chamber 3, and a through-groove 6 is opened along the axial direction of the furnace chamber 3 to form an annular, open heating wire 4 installation channel 10. Multiple through-grooves 6 are evenly distributed along the axial direction of the furnace chamber 3 to achieve uniform heating of the furnace chamber 3. Furthermore, a positioning groove 7 is provided on the outer wall of the furnace chamber 3, corresponding to each through-groove 6. This positioning groove 7 is an annular spiral groove that cooperates with the spiral heating wire 4. The depth of the annular spiral groove is 1.2-1.5 times the diameter of the heating wire 4, and the spiral angle is 30°-60°. The depth and angle design of the slot 7 ensures that the heating wire 4 is evenly wound along the preset path and can limit the movement of the heating wire 4, avoiding local overheating or insufficient cooling caused by uneven spacing of the heating wire 4. This achieves uniform distribution and positioning of the heating wire 4 on the furnace chamber 3. The uniform distribution of the heating wire 4 can also reduce the erosion rate of the heating wire 4 and extend the replacement cycle. At the same time, the open installation of the heating wire 4 makes it easy for staff to find and replace damaged heating wire 4. In specific use, the heating wire 4 is first wound around the furnace chamber 3 and installed at the slot 6. Then, the head end of the heating wire 4 is bent into a hook shape, and the end of the heating wire 4 is bent into a loop shape. The hook-shaped head end is hung on the end of the loop shape, so that each heating wire 4 is positioned evenly in the slot. The heating wire 4 is fixed at 6 points, thus securing it to the furnace chamber 3. Other methods can also be used, such as bending both the head and tail of the heating wire 4 into loops to form a fixing ring, then inserting a pin through the fixing ring into the side wall of the furnace chamber 3. These methods of fixing the heating wire 4 are existing technologies familiar to those skilled in the art and are not shown in the figure. To avoid excessive friction between the heating wire 4 and the positioning groove 7 during installation, a high-temperature resistant lubricating coating (such as a titanium nitride coating) can be applied inside the positioning groove 7 to prevent wear caused by direct contact between the heating wire 4 and the groove wall, maintain the accuracy of the positioning groove 7, and extend the service life of the equipment. The heating wire 4 is typically made of a high-resistivity material (such as nickel-chromium). Made of alloys (such as iron-chromium-aluminum alloys), when current passes through, resistance is converted into heat according to Joule's law. Depending on the power requirements, the heating wire 4 can be connected in series or parallel to the circuit. Industrial electric furnaces often use three-phase power supply, distributing power through star or delta connection. After long-term use, the resistance at the head and end of the heating wire 4 increases, leading to a rise in temperature. Installing temperature sensors at the connection between the head and end of the heating wire 4 can provide early warning of aging risks. If the end temperature drops suddenly, it may indicate that the heating wire 4 has broken somewhere, making it easy to quickly locate the fault point. When the temperature exceeds the preset threshold, the temperature signal can be transmitted to the external control device to trigger an alarm and promptly remind the staff.

[0024] Furthermore, such as Figure 3-4 As shown, in order to remove the insulation layer 5 during maintenance and replacement of the furnace 3, the insulation layer 5 can be configured as a shell 8 with an internal insulation material (such as ceramic fiber or aerogel), and the shape of the shell 8 is adapted to the furnace 3, such as... Figure 3As shown, when the furnace chamber 3 is cylindrical, the shell 8 is also cylindrical, and the shell 8 covers the furnace chamber 3 from top to bottom, and is connected to the bottom of the furnace chamber 3 by bolts 9. A sealing gasket is also filled between the furnace chamber 3 and the bottom of the shell 8 to prevent heat leakage from the connection between the insulation layer 5 and the furnace chamber 3, thereby improving equipment safety. This replaces the traditional insulation layer 5 made of scattered insulation cotton, making disassembly more convenient and quick, and less prone to dust generation. Since the heating element 4 in this technical solution is installed on the outer wall of the furnace chamber 3, in order to ensure the insulation effect, protect the heating element 4, and improve energy utilization efficiency, the insulation layer 5 is generally installed on the outside of the heating element 4. In this way, the insulation layer 5 can reflect the heat generated by the heating element 4 back into the furnace chamber 3 as much as possible, reducing the heat loss to the surrounding environment. At the same time, it can also prevent the heat of the heating element 4 from being transferred to the outside too much, avoiding burns to the operators, and providing a certain degree of protection for the heating element 4, allowing it to work in a suitable temperature environment and extending its service life.

Claims

1. A high-temperature furnace facilitating replacement of furnace wire, comprising a furnace chamber (3) having a containing chamber (1) inside and an inlet (2) at one end, a plurality of through-slots (6) for mounting helical furnace wire (4) being opened on the furnace chamber (3), and a heat insulation layer (5) for reducing heat loss inside the furnace chamber (3), characterized in that: Each of the through-slots (6) is opened through along the circumferential direction of the furnace (3), and a plurality of the through-slots (6) are uniformly distributed along the axial direction of the furnace (3), the outer side wall of the furnace (3) and the part corresponding to each of the through-slots (6) is provided with a positioning slot (7), which is a ring-shaped spiral slot matched with the spiral-shaped furnace wire (4), the positioning slot (7) is used to force the furnace wire (4) to be wound along the preset pitch path during the installation of the furnace wire (4), so as to realize the uniform distribution and positioning of the furnace wire (4) on the furnace (3).

2. The high temperature furnace with easy replacement of the heating element as claimed in claim 1 wherein: The heat insulation layer (5) is a shell (8) with heat insulation material inside, which covers the outside of the furnace (3) and is detachably connected with the furnace (3).

3. The high temperature furnace with easy replacement of the heating element as claimed in claim 1 wherein: The shape of the furnace (3) includes but is not limited to a conical shape or a cylindrical shape.

4. The high temperature furnace with easy replacement of the heating element as claimed in claim 1 wherein: The head end and the tail end of the furnace wire (4) at each of the through-slots (6) are detachably connected.

5. The high temperature furnace with easy replacement of the heating element as claimed in claim 1 wherein: The slot wall surface of the positioning slot (7) is provided with a high-temperature-resistant lubricating coating, which is used to reduce the friction during the installation of the furnace wire (4).

6. The high temperature furnace with easy replacement of the heating element as claimed in claim 1 wherein: The connection between the head end and the tail end of the furnace wire (4) is provided with a temperature sensor, which is electrically connected with an external control device, which is used to monitor the temperature of the connection between the furnace wire (4) in real time, and trigger an alarm when the temperature is abnormal.

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