Stainless steel heating tube
By using stainless steel heating elements, the problems of slow heat conduction and insufficient mechanical strength caused by the thick walls of ceramic heating elements are solved, achieving rapid heat conduction and heating, with good mechanical strength and dimensional accuracy, and with zoned temperature control function.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- GUANGDONG GUOYAN NEW MATERIALS CO LTD
- Filing Date
- 2025-05-26
- Publication Date
- 2026-05-08
AI Technical Summary
Traditional ceramic heating tubes have thick walls, which leads to a decrease in heat conduction rate and a slow heating rate. They also have insufficient mechanical strength and are difficult to control in terms of dimensional accuracy.
The heating element is made of stainless steel, with the tube blank wall thickness reduced to less than 0.15mm. The structure is simple, and multiple sets of resistance circuits and lead-out electrodes are used to ensure fast thermal conductivity and rapid heating. The mechanical strength and dimensional accuracy are improved by using an isolation insulation layer and an outer insulation layer.
It achieves rapid heat conduction and heating, possesses good mechanical strength and dimensional accuracy, has a wide range of applications, and features zoned temperature control.
Smart Images
Figure CN224218541U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heating element technology, specifically to a stainless steel heating tube. Background Technology
[0002] In recent years, traditional ceramic heating elements have failed to meet the requirements for heating speed in heaters. Traditional ceramic heating tubes, formed by rolling two layers of ceramic substrates or by wrapping a ceramic substrate around a tube blank, have excessively thick walls. Taking alumina ceramic heating tubes as an example, the thinnest existing products have walls of only 0.5-0.6 mm. This excessively thick wall structure directly causes a decrease in heat conduction rate and a slow heating speed. When the wall thickness is reduced to below 0.5 mm, the mechanical strength of the tube structure is significantly reduced, making it prone to deformation during forming and sintering, resulting in difficulty in ensuring roundness accuracy and controlling the thin wall thickness. Furthermore, the high-temperature firing process of existing alumina ceramic heating tubes leads to unstable material shrinkage and uneven heating during sintering, causing dimensional deviations in the final product to exceed the design range. These large dimensional tolerance deviations directly affect the assembly performance and usability of the heating tube. Summary of the Invention
[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a stainless steel heating tube. The stainless steel heating tube has a simple structure and, compared with the traditional ceramic heating tube, has a fast thermal conductivity and a fast heating speed. The wall thickness of the tube blank can be reduced to less than 0.15mm. While controlling the dimensional accuracy precisely, the heating tube can still ensure good mechanical strength.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] A stainless steel heating element includes a flange and a tube blank. One end of the tube blank is integrally connected to the flange, and the other end of the tube blank extends outward with two symmetrically arranged lead-out clips. Both the flange and the tube blank are made of stainless steel. The outer circumferential surface of the tube blank is sequentially thick-film printed with an insulating layer, a heating layer, and an outer insulating layer. The heating layer includes multiple lead-out electrodes and at least one set of resistance lines, with each lead-out electrode connected to a corresponding resistance line.
[0006] Furthermore, the thickness of the tube blank is 0.08-0.12 mm.
[0007] Furthermore, each group of resistor circuits exhibits a reciprocating zigzag trajectory.
[0008] Furthermore, the plurality of lead-out electrodes are spaced apart along the axial direction of the tube blank.
[0009] Furthermore, the heating layer includes a set of resistive circuits, and the number of lead-out electrodes is two, with each lead-out electrode connected to one of the two ends of the resistive circuit.
[0010] Furthermore, the heating layer includes multiple sets of resistive lines, wherein at least two sets of resistive lines are connected in series, and the number of lead-out electrodes is at least three.
[0011] Furthermore, the heating layer includes multiple sets of resistive lines, wherein at least two sets of resistive lines are connected in parallel, and the number of lead-out electrodes is at least three.
[0012] Furthermore, the heating layer includes three sets of resistive circuits, namely a first resistive circuit, a second resistive circuit, and a third resistive circuit. The number of lead-out electrodes is three, namely a first lead-out electrode, a second lead-out electrode, and a third lead-out electrode. The second resistive circuit includes a first resistive branch and a second resistive branch, both connected to the second lead-out electrode. The first and second resistive branches are connected in parallel. One end of the first resistive circuit is connected in parallel to the first resistive branch, and the other end of the first resistive circuit is connected to the first lead-out electrode. One end of the third resistive circuit is connected in parallel to the second resistive branch, and the other end of the third resistive circuit is connected to the third lead-out electrode.
[0013] Furthermore, each of the lead electrodes has leads welded to its outer surface.
[0014] The beneficial effects of this utility model are as follows: The stainless steel heating tube of this utility model uses a stainless steel tube blank, which can achieve fast thermal conductivity and rapid heating. Furthermore, the thickness of the tube blank can be set according to requirements, ensuring precise dimensional control and a wide range of applications. Moreover, the heating layer uses multiple sets of resistance circuits and multiple lead-out electrodes to provide resistance heating, facilitating zoned temperature control and enhancing functionality. Compared to existing ceramic heating elements, the stainless steel heating tube of this utility model has advantages such as fast thermal response and convenient forming and processing. Even when the wall thickness of the tube blank is reduced to below 0.15mm, it still maintains good mechanical strength, combining thin walls, excellent thermal conductivity, and good mechanical properties, resulting in superior overall performance. Attached Figure Description
[0015] Figure 1 This is a three-dimensional structural diagram of a stainless steel heating element.
[0016] Figure 2 This is a three-dimensional structural diagram of a stainless steel heating element from another view.
[0017] Figure 3 This is a three-dimensional structural diagram of a stainless steel heating element without an outer insulation layer.
[0018] Figure 4 This is a three-dimensional structural diagram showing the flange and the lead-out clip integrally connected to both ends of the tube blank.
[0019] The reference numerals in the figures include:
[0020] 1. Flange; 2. Tube blank; 3. Lead-out clip; 4. Insulation layer; 5. Heating layer; 51. Resistance circuit; 511. First resistance circuit; 512. Second resistance circuit; 5121. First resistance branch; 5122. Second resistance branch; 513. Third resistance circuit; 52. Lead-out electrode; 521. First lead-out electrode; 522. Second lead-out electrode; 523. Third lead-out electrode; 6. Outer insulation layer; 7. Lead wire. Detailed Implementation
[0021] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.
[0022] Example 1
[0023] like Figure 1 , 2 As shown in Figure 4, a stainless steel heating tube is provided. One end of the tube blank 2 is integrally connected to the flange 1, and the other end of the tube blank 2 extends outward with two symmetrically arranged lead-out buckles 3. The lead-out buckles 3 are used to engage with the components assembled with the heating tube. Both the flange 1 and the tube blank 2 are made of stainless steel. The outer circumferential surface of the tube blank 2 is sequentially thick-film printed with an isolation insulation layer 4, a heating layer 5, and an outer insulation layer 6. The heating layer 5 includes multiple lead-out electrodes 52 and at least one set of resistance lines 51. Each lead-out electrode 52 is connected to the corresponding resistance line 51.
[0024] This utility model discloses a stainless steel heating tube with a simple structure. Using a stainless steel tube blank 2, it achieves rapid thermal conductivity and heating speed. The thickness of the tube blank 2 can be set as needed, ensuring precise dimensional control and wide applicability. Specifically, the outer circumferential surface of the tube blank 2 is sequentially thick-film printed with an insulating layer 4, a heating layer 5, and an outer insulating layer 6. The insulating layer 4 provides electrical isolation, preventing current leakage to the tube blank 2. The heating layer provides resistance heating and employs multiple sets of resistance circuits 51 and multiple lead-out electrodes 52, facilitating zoned temperature control. The outer insulating layer 6 serves to resist wear, isolate moisture, and resist acid and alkali corrosion. Furthermore, the insulating layer 4, heating layer 5, and outer insulating layer 6 are all thick-film printed, resulting in good connection performance and resistance to wire breakage. This leads to a dense structure formed by the sintered insulating layer 4, heating layer 5, and outer insulating layer 6, which is wear-resistant and vibration-resistant. Compared with existing ceramic heating elements, the stainless steel heating tube of this invention has the advantages of fast thermal response and convenient forming and processing. When the wall thickness of the tube blank 2 is reduced to less than 0.15mm, it still has good mechanical strength, combining the characteristics of thin wall and strong mechanical properties, and has excellent comprehensive performance.
[0025] In this embodiment, the lead-out buckle 3 is integrally connected to the tube blank 2, and the connection is stable.
[0026] Furthermore, the thickness of the tube blank 2 is 0.08-0.12 mm. In this embodiment, the thickness of the tube blank 2 is 0.1 mm, the dimensional tolerance can reach ±0.05, the dimensional accuracy deviation is small, and the preparation is excellent.
[0027] Furthermore, each set of resistor lines 51 has a reciprocating folding trajectory to ensure the uniformity of axial temperature of the heating tube.
[0028] Furthermore, multiple lead-out electrodes 52 are spaced apart along the axial direction of the tube blank 2, and each lead-out electrode 52 has a lead wire 7 welded to its outer surface, which facilitates the assembly of the lead wire 7 with the corresponding lead-out electrode 52 and also facilitates connection with an external control device.
[0029] Furthermore, the number of resistor lines 51 and lead-out electrode lines can be adjusted accordingly.
[0030] In this embodiment, the heating layer 5 includes a set of resistive circuits 51, and two lead-out electrodes 52, which are respectively connected to the two ends of the resistive circuits 51. The heating layer adopts a basic configuration of a single set of resistive circuits 51 and two electrodes, which is simple in structure and can meet basic heating requirements.
[0031] Example 2
[0032] Compared to Embodiment 1, the heating layer 5 in this embodiment includes multiple sets of resistor lines 51, wherein at least two sets of resistor lines 51 are connected in series, and the number of lead-out electrodes 52 is at least three. The heating layer uses multiple sets of series-connected resistor lines 51 and multiple electrodes. The series resistors can distribute the total voltage to each segment, reducing the risk of breakdown, and also facilitate power adjustment to achieve zoned temperature control.
[0033] In this embodiment, the heating layer 5 includes two sets of resistor lines 51 connected in series. The number of lead-out electrodes 52 is three. One lead-out electrode 52 is located between the two sets of resistor lines 51, and the other two lead-out electrodes 52 are respectively connected to the two ends of the two sets of resistor lines 51 that are far apart from each other. The lead-out electrode 52 located between the two sets of resistor lines 51 is a common electrode. By switching the lead-out electrodes 52, the segmented power control of the heating tube can be realized.
[0034] Example 3
[0035] The heating layer 5 includes multiple sets of resistive lines 51, wherein at least two sets of resistive lines 51 are connected in parallel, and the number of lead-out electrodes 52 is at least three. The heating layer 5 uses multiple sets of parallel resistive lines 51 and multiple electrodes, which can increase the current carrying capacity and improve the instantaneous power, while facilitating zoned temperature control.
[0036] like Figure 3 As shown, in this embodiment, the heating layer 5 includes three sets of resistor lines 51, namely a first resistor line 511, a second resistor line 512, and a third resistor line 513. There are three lead-out electrodes 52, namely a first lead-out electrode 521, a second lead-out electrode 522, and a third lead-out electrode 523. The second resistor line 512 includes a first resistor branch 5121 and a second resistor branch 5122, both connected to the second lead-out electrode 522. The first resistor branch 5121 and the second resistor branch 5122 are connected in parallel. One end of the first resistor line 511 is connected in parallel to the first resistor branch 5121, and the other end of the first resistor line 511 is connected to the first lead-out electrode 521. One end of the third resistor line 513 is connected in parallel to the second resistor branch 5122, and the other end of the third resistor line 513 is connected to the third lead-out electrode 523. By switching the lead-out electrodes 52, segmented power control of the heating element is achieved.
[0037] Specifically, one end of the first resistor branch 5121 and the second resistor branch 5122 connected in parallel is connected to the second lead electrode 522, which can reduce the area occupied by the second resistor line 512.
[0038] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of this utility model. The content of this specification should not be construed as a limitation of this utility model.
Claims
1. A stainless steel heating element, characterized in that: The tube blank (2) includes a flange (1) and a tube blank (2). One end of the tube blank (2) is integrally connected to the flange (1). The other end of the tube blank (2) extends outward with two symmetrically arranged lead-out buckles (3). Both the flange (1) and the tube blank (2) are made of stainless steel. The outer circumferential surface of the tube blank (2) is sequentially printed with an isolation insulation layer (4), a heating layer (5) and an outer insulation layer (6). The heating layer (5) includes multiple lead-out electrodes (52) and at least one set of resistance lines (51). Each lead-out electrode (52) is connected to the corresponding resistance line (51).
2. The stainless steel heating element according to claim 1, characterized in that: The thickness of the tube blank (2) is 0.08-0.12 mm.
3. The stainless steel heating element according to claim 1, characterized in that: Each group of resistor lines (51) exhibits a reciprocating zigzag trajectory.
4. The stainless steel heating element according to claim 1, characterized in that: The plurality of lead-out electrodes (52) are spaced apart along the axial direction of the tube blank (2).
5. The stainless steel heating element according to claim 1, characterized in that: The heating layer (5) includes a set of resistive circuits (51), and there are two lead-out electrodes (52), which are respectively connected to the two ends of the resistive circuits (51).
6. The stainless steel heating element according to claim 1, characterized in that: The heating layer (5) includes multiple sets of resistive lines (51), wherein at least two sets of resistive lines (51) are connected in series, and the number of lead-out electrodes (52) is at least three.
7. The stainless steel heating element according to claim 1, characterized in that: The heating layer (5) includes multiple sets of resistive lines (51), wherein at least two sets of resistive lines (51) are connected in parallel, and the number of lead-out electrodes (52) is at least three.
8. The stainless steel heating element according to claim 1, characterized in that: The heating layer (5) includes three sets of resistor lines (51), which are a first resistor line (511), a second resistor line (512), and a third resistor line (513). There are three lead-out electrodes (52), which are a first lead-out electrode (521), a second lead-out electrode (522), and a third lead-out electrode (523). The second resistor line (512) includes first resistor branches (51) all connected to the second lead-out electrodes (522). 21) and the second resistor branch (5122), the first resistor branch (5121) and the second resistor branch (5122) are connected in parallel, one end of the first resistor line (511) is connected in parallel with the first resistor branch (5121), the other end of the first resistor line (511) is connected to the first lead electrode (521), one end of the third resistor line (513) is connected in parallel with the second resistor branch (5122), and the other end of the third resistor line (513) is connected to the third lead electrode (523).
9. The stainless steel heating element according to claim 1, characterized in that: Each of the lead-out electrodes (52) has a lead wire (7) welded to its outer surface.