A heating element for a glass heating furnace

Abstract

This application relates to a heating element for a glass heating furnace, comprising a heating wire, a support tube, and a support base. The heating wire is spirally wound around the outer peripheral wall of the support tube, which is mounted on the support base. It also includes a wire limiting member, comprising a spiral portion and an end shaft portion. The end shaft portion is connected to the spiral portion, and the axes of both the spiral portion and the end shaft portion coincide with the axis of the support tube. The end of the end shaft portion away from the spiral portion is connected to the support tube. The heating wire is spirally wound between adjacent threads of the spiral portion. This application, by installing a wire limiting member at the end of the support tube and using the spiral portion of the wire limiting member to spirally wind both ends of the heating wire between adjacent threads for limiting and fixing, and in conjunction with the heating wire body spirally wound onto the support tube, enables the heating wire to resist greater thermal stress during repeated hot and cold cycles, reducing creep and displacement, thereby improving the heating uniformity and service life of the heating element.

Description

Technical Field

[0001] This application relates to the technical field of glass deep processing production equipment, and in particular to a heating element for a glass heating furnace. Background Technology

[0002] In the glass deep processing industry, the heating and sintering section typically requires the use of a heating furnace to soften the glass at high temperatures. The heating elements inside the furnace usually rely on electric heating wires to generate heat. The specific structure of the heating element is as follows: the electric heating wire is spirally wound onto the outer wall of a ceramic tube, and both ends of the wire are fixed in place by various limiting components. The ceramic tube carrying the heating wire is then clamped into slots in ceramic seats on both sides, allowing multiple sets of heating elements with the above structure to be arranged within the furnace cavity for heating operations.

[0003] In existing technologies, the main methods for limiting the position of heating wires are wire binding and pin fixing. Wire binding involves tightly wrapping multiple sets of high-temperature alloy wires around the straight sections at both ends of the heating wire, thus firmly securing it within the ceramic tube. Pin fixing requires pre-drilling radial through holes in the ceramic tube's circumference, then inserting high-temperature pins into these holes to position the heating wire, using the protruding end of the pin to restrict the wire's free movement along the ceramic tube's axis. However, as the heating element repeatedly heats up and cools down within the furnace cavity, the heating wire undergoes thermal expansion and creeping elongation. Due to the ineffectiveness of the aforementioned two limiting methods, the spiral portion of the heating wire is prone to shifting along the ceramic tube's axis, leading to phenomena such as localized wire tilting, reduced pitch and coiling, and wire burnout. This affects the uniformity of the furnace temperature, damages heating control components, and disrupts normal production. Furthermore, if the tie wire and pin are made of metal, they are prone to short circuits when they come into contact with the heating element or other furnace structure during the limiting operation.

[0004] Regarding the aforementioned technologies, the applicant believes that the existing heating element wire limiting structure is insufficient to cope with the expansion and creep of the heating wire during long-term use, which leads to a decrease in the wire limiting effect and causes problems such as uneven distribution of the heating wire spiral, further affecting the heating uniformity of the heating element. Utility Model Content

[0005] In order to improve the limiting stability of the heating wire, so as to ensure the heating uniformity of the heating element and extend the service life of the heating element, this application provides a heating element for a glass heating furnace.

[0006] Firstly, the heating element for a glass heating furnace provided in this application adopts the following technical solution: A heating element for a glass heating furnace includes a heating wire, a support tube, and a support base. The heating wire is spirally wound around the outer peripheral wall of the support tube, and the support tube is mounted on the support base. The element also includes a heating wire limiting member, which includes a spiral portion and an end shaft portion. The end shaft portion is connected to the spiral portion, and the axes of both the spiral portion and the end shaft portion coincide with the axis of the support tube. The end of the end shaft portion away from the spiral portion is connected to the support tube. The heating wire is spirally wound between adjacent threads of the spiral portion.

[0007] By adopting the above technical solution, a heating wire limiting component is installed at the end of the support tube. The two ends of the heating wire are first spirally wound onto the adjacent threads of the spiral portion of the heating wire limiting component for binding and fixation. The spiral portion of the heating wire limiting component ensures that the pitch between each turn of the heating wire remains constant, avoiding localized uneven pitch caused by heating wire relaxation, deformation, displacement, or installation stress. Combined with the heating wire body, which is also spirally wound onto the support tube, the entire heating wire is in a specific, uniform spiral state. This allows the heating wire to resist greater thermal stress during repeated hot and cold cycles, reducing creep and displacement. The uniform wire spacing also allows for even heat distribution into the furnace, further improving the heating uniformity and service life of the heating element, as well as the product quality of glass deep processing. Furthermore, because the connection method between the heating wire limiting component, the support tube, and the heating wire is simple and effective, the heating wire only needs to be wound along the spiral groove of the spiral portion of the heating wire limiting component during installation, eliminating the need for repeated measurement and adjustment of the spacing, thus improving installation efficiency. Furthermore, different specifications of heating wire limit components can be replaced according to different processing conditions, which facilitates the regular replacement or maintenance of heating wire limit components and improves the practicality of heating elements.

[0008] Preferably, the number of turns of the spiral portion is set to 2.5 to 5 turns.

[0009] By adopting the above technical solution, setting the number of turns of the spiral section to 2.5 to 5 turns can provide stable and uniform support and restraint for the heating wire. During long-term heating, the heating wire tends to droop downwards or loosen to the sides under its own gravity. Setting the number of turns within this range has two advantages. First, it can provide continuous, multi-point lateral support for the heating wire, ensuring that each turn of the wire is constrained between the spiral grooves formed by adjacent threads, effectively preventing displacement, deformation, or contact (short circuit). Second, the spiral section of the heating wire restraining component is mainly used to wind and restrain the two ends of the heating wire. Setting the number of turns within this range can achieve the restraining effect without causing excessive waste of heating wire material (since the part of the heating wire spirally wound on the support tube is mainly used to form a stable heat field), thus controlling the production cost of the heating element.

[0010] Preferably, the pitch of the helical portion is set to 6 to 20 mm.

[0011] By adopting the above technical solution, setting the pitch of the spiral section to 6-20 mm allows for proper coordination with the heating wire body, which is also spirally wound onto the support tube. The thread spacing of the spiral section of the wire limiting component is fixed, and the wire is wound within it. This precisely ensures the consistency of the pitch of the entire heating wire from the main body to the end, further guaranteeing the heating uniformity of the heating element. Simultaneously, limiting the pitch of the spiral section within this range also allows for controllable axial thermal expansion of the end wire during heating. This utilizes the spiral shape to provide guidance and limitation without excessively restricting the wire, allowing the wire to smoothly expand and contract along the spiral groove, releasing thermal stress.

[0012] Preferably, the helix angle of the spiral portion is set to 45–75°.

[0013] By adopting the above technical solution, setting the helix angle of the spiral part to 45-75° can enhance the limiting and fixing effect of the spiral groove formed between adjacent threads on the spiral part on the heating wire. When the helix angle is less than 45°, the equipment may vibrate during operation, causing the heating wire to shift or be damaged due to shaking; when the helix angle is greater than 75°, the binding effect of the spiral part on the end of the heating wire is too great, which may cause the heating wire to break during the expansion and contraction process.

[0014] Secondly, this application provides a heating element for a glass heating furnace, comprising a heating wire, a support tube, and a support base. The heating wire is spirally wound around the outer peripheral wall of the support tube, and the support tube is mounted on the support base. The element also includes a heating wire limiting member, which comprises a spiral portion and two end shaft portions. Each end shaft portion is connected to both sides of the spiral portion along an axial direction, and the axes of the spiral portion and the end shaft portions coincide with the axis of the support tube. The heating wire is spirally wound between adjacent threads of the spiral portion. Two support tubes are provided, and the two support tubes are respectively connected to the two end shafts on both sides of the spiral part.

[0015] The main difference between this heating element and the aforementioned heating element lies in the structure and installation position of the heating wire limiting component. Structurally, this heating wire limiting component has end shafts connected to both sides of the spiral section, resulting in two end shafts facing different directions for a single heating wire limiting component. The installation position of the two types of limiting components differs significantly due to the structural differences. The aforementioned heating wire limiting components are mainly installed at both ends of a single support tube and are fixed inside the same support tube by the end shafts of each (two) heating wire limiting components. This heating wire limiting component, however, is mainly installed between two coaxial support tubes to form a transition for heating wire limiting. The end shafts on both sides of the spiral section are respectively engaged with two different support tubes, thus providing more heating element arrangement options (such as when the heating element inside the furnace needs to be lengthened). Furthermore, it supplements and strengthens the limiting effect of the spiral winding state of the heating wire in longer runs, or transmits the limiting effect.

[0016] Preferably, the number of turns of the spiral portion is set to 2.5 to 5 turns.

[0017] By adopting the above technical solution, setting the number of turns of the spiral section to 2.5 to 5 turns can provide stable and uniform support and restraint for the heating wire. During long-term heating, the heating wire tends to droop downwards or loosen to the sides under its own gravity. Setting the number of turns within this range has two advantages. First, it can provide continuous, multi-point lateral support for the heating wire, ensuring that each turn of the wire is constrained between the spiral grooves formed by adjacent threads, effectively preventing displacement, deformation, or contact (short circuit). Second, the spiral section of the heating wire restraining component is mainly used to wind and restrain the two ends of the heating wire. Setting the number of turns within this range can achieve the restraining effect without causing excessive waste of heating wire material (since the part of the heating wire spirally wound on the support tube is mainly used to form a stable heat field), thus controlling the production cost of the heating element.

[0018] Preferably, the pitch of the helical portion is set to 6 to 20 mm.

[0019] By adopting the above technical solution, setting the pitch of the spiral section to 6-20 mm allows for proper coordination with the heating wire body, which is also spirally wound onto the support tube. The thread spacing of the spiral section of the wire limiting component is fixed, and the wire is wound within it. This precisely ensures the consistency of the pitch of the entire heating wire from the main body to the end, further guaranteeing the heating uniformity of the heating element. Simultaneously, limiting the pitch of the spiral section within this range also allows for controllable axial thermal expansion of the end wire during heating. This utilizes the spiral shape to provide guidance and limitation without excessively restricting the wire, allowing the wire to smoothly expand and contract along the spiral groove, releasing thermal stress.

[0020] Preferably, the helix angle of the spiral portion is set to 45–75°.

[0021] By adopting the above technical solution, setting the helix angle of the spiral part to 45-75° can enhance the limiting and fixing effect of the spiral groove formed between adjacent threads on the spiral part on the heating wire. When the helix angle is less than 45°, the equipment may vibrate during operation, causing the heating wire to shift or be damaged due to shaking; when the helix angle is greater than 75°, the binding effect of the spiral part on the end of the heating wire is too great, which may cause the heating wire to break during the expansion and contraction process.

[0022] In summary, this application includes at least one of the following beneficial technical effects: 1. This application utilizes a heating wire limiting component installed at the end of a support tube. The heating wire is first spirally wound around both ends of the limiting component between adjacent threads on the spiral portion for secure fixation. The spiral portion of the limiting component ensures a constant pitch between each turn of the heating wire, preventing uneven pitch caused by thermal relaxation, deformation, displacement, or installation stress. Combined with the heating wire body spirally wound onto the support tube, this ensures the entire heating wire is in a specific, uniform spiral state. This allows the wire to resist significant thermal stress during repeated hot and cold cycles, reducing creep and displacement. The uniform wire spacing also allows for even heat distribution within the furnace, further improving heating uniformity, lifespan, and product quality in glass deep processing. Furthermore, the connection between the limiting component, support tube, and heating wire is simple and effective. During installation, the wire only needs to be wound along the spiral groove of the limiting component, eliminating the need for repeated measurement and adjustment of the spacing, thus improving installation efficiency. Furthermore, different specifications of heating wire limit components can be replaced according to different processing conditions, which facilitates the regular replacement or maintenance of heating wire limit components and improves the practicality of heating elements. 2. This application provides another heating element, which differs from the aforementioned heating element mainly in the structure and installation position of the heating wire limiting member. Structurally, this heating wire limiting member has end shafts connected to both sides of the spiral portion along its axial direction, thus a single heating wire limiting member has two end shafts facing different directions. Regarding the installation position, the difference in the structure of the heating wire limiting member results in drastically different installation positions for the two types of limiting members. The aforementioned heating wire limiting member is mainly installed at both ends of a single support tube and is fixed inside the same support tube by snapping the end shafts of each (two) heating wire limiting members together; while this heating wire limiting member is mainly installed between two coaxial support tubes to form a transition for limiting and supporting the heating wire. The end shafts on both sides of the spiral portion are respectively snapped to two different support tubes, thus providing more heating element arrangement methods (such as when the heating element inside the furnace needs to be lengthened), and supplementing and strengthening the limiting effect of the spiral winding state of the heating wire in a longer path, or transmitting the limiting effect. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of the furnace wire limiting component in Embodiment 1 of this application.

[0024] Figure 2 This is a schematic diagram of the heating element in Embodiment 1 of this application.

[0025] Figure 3 This is a side view of the heating element in Embodiment 1 of this application.

[0026] Figure 4 This is a schematic diagram of the structure of the furnace wire limiting component in Embodiment 2 of this application.

[0027] Figure 5 This is a schematic diagram of the heating element in Embodiment 2 of this application.

[0028] Explanation of reference numerals in the attached drawings: 1. Heating wire; 2. Support tube; 3. Support base; 4. Wire limiting component; 41. Spiral part; 42. End shaft part. Detailed Implementation

[0029] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0030] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0032] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0034] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0035] Reference Figure 1 and Figure 2This application discloses a heating element for a glass heating furnace, comprising a heating wire 1, a support tube 2, and a support base 3. The heating wire 1 is spirally and uniformly wound onto the outer peripheral wall of the support tube 2, and the support tube 2 is detachably mounted on the support base 3. The number of support tubes 2 and support bases 3 can be arranged according to the actual thermal distribution within the furnace, such as one support tube 2 mounted on two support bases 3, with the support bases 3 located near both ends of the support tube 2. The heating wire 1 can be made of an iron-chromium-aluminum alloy or a nickel-chromium alloy, wound into a spiral shape with specific parameters onto the outer peripheral wall of the support tube 2. Both the support tube 2 and the support base 3 can be made of high-temperature resistant high-alumina ceramic material. The support tube 2 is a conventional hollow round tube structure. The support base 3 includes an upper support and a lower support. The upper support is installed on the lower support and can be fixed by bolts or other structures. At the same time, the upper support and the lower support together form multiple slots (such as U-shaped slots) that can accommodate the ends of the support tube 2. That is, the diameter of the slots in the support base 3 is slightly larger than the outer diameter of the support tube 2, and a certain gap needs to be reserved in the slots to allow the support tube 2 and the support base 3 to expand asynchronously at high temperatures.

[0036] The installation method between the support base 3 and the support tube 2 can usually be supplemented with relevant positioning components to prevent the support tube 2 from easily shifting axially within the slot of the support base 3. Common structures include: providing a shallow annular groove at the end of the support tube 2 to cooperate with the protrusion on the support base 3, increasing stability and preventing rolling. Alternatively, simple positioning can be achieved between the support base 3 and the support tube 2 using raised ribs, positioning pins, or other special non-circular contours, effectively preventing the support tube 2 from rotating circumferentially and shifting axially within the slot of the support base 3. This ensures the stability of the spiral winding direction of the heating wire 1 and avoids the heating wire 1 from loosening or short-circuiting due to rotation.

[0037] Example 1 Reference Figure 2 and Figure 3 In this embodiment, a heating element for a glass heating furnace further includes a wire limiting member 4 for limiting the end of the heating wire 1. The wire limiting member 4 includes a spiral portion 41 and an end shaft portion 42. The end shaft portion 42 is fixedly connected to the spiral portion 41, and the two are integrated to form the wire limiting member 4. The axis of the spiral portion 41 and the axis of the end shaft portion 42 coincide with each other. In this embodiment, the wire limiting member 4 is mainly used to be installed at the end position of the support tube 2, and a single wire limiting member 4 contains only one end shaft portion 42. Specifically, the axial directions of the end shaft portion 42 and the spiral portion 41 of the wire limiting member 4 are both placed and installed along the axial direction of the support tube 2, that is, the end shaft portion 42 is inserted into the tube diameter of the support tube 2 for detachable installation.

[0038] The heating wire 1 has an overall spiral shape and can be divided into a main body and two end parts. The main body of the heating wire 1 is evenly spirally wound around the outer peripheral wall of the support tube 2, while the end parts of the heating wire 1 are evenly wound into the spiral groove formed by adjacent threads in the spiral portion 41 of the wire limiting member 4. Preferably, the spiral parameters in the main body and end parts of the heating wire 1 can be set to be the same or close, thereby ensuring that the heating wire 1 has a relatively consistent spiral state, reducing the risk of deformation during repeated heating and cooling, and further ensuring the heating uniformity of the heating element.

[0039] The number of turns of the spiral portion 41 in the heating wire limiting component 4 is set to 2.5 to 5, preferably 4 to 5; the pitch of the spiral portion 41 is set to 6 to 20 mm, preferably 10 to 18 mm; and the helix angle of the spiral portion 41 is set to 45 to 75°, preferably 60 to 75°. The spiral direction of the heating wire 1 and the heating wire limiting component 4 is the same, and can be either left-handed or right-handed, without specific restrictions. The thread cross-sectional shape (tooth profile) of the spiral portion 41 in the heating wire limiting component 4 can be selected as a triangular thread, rectangular thread, trapezoidal thread, sawtooth thread, or other special-shaped thread, again without specific restrictions.

[0040] In this embodiment, the arrangement of the components within the heating element can be configured such that, for a single heating element, there are two filament limiting members 4, two support seats 3, a support tube 2, and a set of heating filaments 1. The two filament limiting members 4 are respectively inserted into both ends of the support tube 2, with the end shafts 42 of the two filament limiting members 4 facing each other. The two support seats 3 are located on both sides along the length of the support tube 2, but there is still a certain distance between the support seats 3 and the heating element. The heating filaments 1 are spirally wound onto the support tube 2 and the two spiral portions 41. Both ends of the heating filaments 1 are also connected to filament leads (not shown in the figure), which extend to the outside for electrical connection. Simultaneously, the heating element can also be placed inside a housing according to actual installation requirements to form a more independent and controllable heating unit.

[0041] Example 2 Reference Figure 4 and Figure 5This embodiment of a heating element for a glass heating furnace further includes a wire limiting member 4 for limiting the middle portion of the heating wire 1. The wire limiting member 4 includes a spiral portion 41 and an end shaft portion 42, and two end shaft portions 42 are provided in a single wire limiting member 4. Along the axial direction of the spiral portion 41 and the end shaft portion 42, the two end shaft portions 42 are respectively fixedly connected to both sides of the spiral portion 41, and the axis of the spiral portion 41 and the axis of the end shaft portion 42 coincide with each other. In this embodiment, the wire limiting member 4 is mainly used to be installed between two parallel support tubes 2 and located in the middle position of the same group of heating wires 1. Specifically, the axial directions of the two end shaft portions 42 and the spiral portion 41 of the wire limiting member 4 are both placed and installed along the axial direction of the support tube 2, that is, the two support tubes 2 are respectively inserted into the end shaft portions 42 on both sides of the spiral portion 41 for detachable installation.

[0042] The heating wire 1 is spirally wound sequentially around the support tube 2 on one side, the heating wire limiting member 4 in the middle, and the support tube 2 on the other side. Similarly, the heating wire 1 on the support tube 2 is evenly spirally wound around the outer peripheral wall of the support tube 2, while the heating wire 1 on the spiral section 41 is evenly wound into the spiral groove formed by adjacent threads in the spiral section 41. Preferably, the spiral parameters of the heating wire 1 on the support tube 2 and the heating wire 1 on the spiral section 41 can be set to be the same or close, thereby ensuring that the heating wire 1 has a relatively consistent spiral state, reducing the risk of deformation during repeated heating and cooling, and further ensuring the heating uniformity of the heating element.

[0043] The number of turns of the spiral portion 41 in the heating wire limiting component 4 is set to 2.5 to 5, preferably 4 to 5; the pitch of the spiral portion 41 is set to 6 to 20 mm, preferably 10 to 18 mm; and the helix angle of the spiral portion 41 is set to 45 to 75°, preferably 60 to 75°. The spiral direction of the heating wire 1 and the heating wire limiting component 4 is the same, and can be either left-handed or right-handed, without specific restrictions. The thread cross-sectional shape (tooth profile) of the spiral portion 41 in the heating wire limiting component 4 can be selected as a triangular thread, rectangular thread, trapezoidal thread, sawtooth thread, or other special-shaped thread, again without specific restrictions.

[0044] In this embodiment, the arrangement of the components within the heating element can be configured such that, for a single heating element, it includes a heating wire limiting member 4, two support seats 3, two support tubes 2, and a set of heating wires 1. The two support tubes 2 are located on opposite sides of the same heating wire limiting member 4, such that the two end shafts 42 within the heating wire limiting member 4 are respectively engaged with two different support tubes 2, and the two end shafts 42 of the heating wire limiting member 4 face opposite directions. The two support seats 3 are located at the midpoint of the length direction of the two support tubes 2. The heating wires 1 are spirally wound onto the two support tubes 2 and the spiral portion 41. Both ends of the heating wires 1 are also connected to heating wire leads (not shown in the figure), which extend to the outside for electrical connection. Simultaneously, the heating element can also be placed inside a housing according to actual installation requirements to form a more independent and controllable heating unit.

[0045] It is worth noting that, in Embodiment 2, the two ends of the two support tubes 2 that are away from the same ferrule limiting member 4 can also be connected to the ferrule limiting member 4 structure provided in Embodiment 1, or other conventional end support structures.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A heating element for a glass heating furnace, comprising a heating wire (1), a support tube (2), and a support base (3), wherein the heating wire (1) is spirally wound around the outer peripheral wall of the support tube (2), and the support tube (2) is mounted on the support base (3), characterized in that: It also includes a heating wire limiting component (4), which includes a spiral part (41) and an end shaft part (42). The end shaft part (42) is connected to the spiral part (41), and the axes of the spiral part (41) and the end shaft part (42) are both coincident with the axis of the support tube (2). The end of the end shaft part (42) away from the spiral part (41) is connected to the support tube (2). The heating wire (1) is spirally wound between the adjacent threads of the spiral part (41).

2. The heating element for a glass heating furnace according to claim 1, characterized in that: The number of turns of the spiral part (41) is set to 2.5 to 5 turns.

3. A heating element for a glass heating furnace according to claim 1, characterized in that: The pitch of the spiral part (41) is set to 6 to 20 mm.

4. A heating element for a glass heating furnace according to claim 1, characterized in that: The helix angle of the spiral part (41) is set to 45-75°.

5. A heating element for a glass heating furnace, comprising a heating wire (1), a support tube (2), and a support base (3), wherein the heating wire (1) is spirally wound around the outer peripheral wall of the support tube (2), and the support tube (2) is mounted on the support base (3), characterized in that: It also includes a heating wire limiting component (4), which includes a spiral part (41) and two end shaft parts (42). Each end shaft part (42) is connected to both sides of the spiral part (41) along the axial direction, and the axes of the spiral part (41) and the end shaft parts (42) coincide with the axis of the support tube (2). The heating wire (1) is spirally wound between the adjacent threads of the spiral part (41). There are two support tubes (2), and the two support tubes (2) are respectively connected to the two end shafts (42) on both sides of the spiral part (41).

6. A heating element for a glass heating furnace according to claim 5, characterized in that: The number of turns of the spiral part (41) is set to 2.5 to 5 turns.

7. A heating element for a glass heating furnace according to claim 5, characterized in that: The pitch of the spiral part (41) is set to 6 to 20 mm.

8. A heating element for a glass heating furnace according to claim 5, characterized in that: The helix angle of the spiral part (41) is set to 45-75°.

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