A multi-layer spiral structure electric heating wire heating device

Abstract

This application relates to the technical field of electric heating wire heating devices, and in particular to a multi-layer spiral structure electric heating wire heating device, which includes a heating body, a multi-layer spiral electric heating wire assembly, and a heat-conducting partition. Adjacent electric heating wire assemblies are separated by the heat-conducting partition, and heat dissipation grooves are provided on the outer side of the partition. A heat-conducting medium is filled between the outer shell and the heating body, and heat dissipation fins are provided on the outer side of the outer shell. This application achieves uniform heat distribution and reduces local overheating through the layered arrangement of the multi-layer spiral electric heating wire assembly and the design of different pitches; the heat-conducting partition and the heat-conducting medium further improve heat transfer efficiency. This application can significantly improve the heat distribution and heating efficiency of the heating device, meeting the requirements for efficient and stable heating.

Description

Technical Field

[0001] This utility model belongs to the field of electric heating technology, specifically a multi-layer spiral structure electric heating wire heating device. Background Technology

[0002] In the field of industrial heating equipment, electric heating wire devices are one of the key components for achieving efficient heat energy conversion. Currently, most electric heating wire devices on the market adopt a single-layer spiral structure design, which generates heat by passing an electric current through the heating wire to meet heating needs. However, in practical applications, these devices often struggle to achieve uniform heat distribution, and their heating efficiency is limited by the structural design. Furthermore, traditional electric heating wire devices are prone to localized overheating during prolonged operation, thus affecting the equipment's lifespan and safety.

[0003] For example, the Chinese utility model patent (application number: 202121456789.2) discloses a "spiral heating wire heating device," which includes a heating shell, a support frame inside the heating shell, a single-layer spiral heating wire fixedly mounted on the support frame, power connection terminals at both ends of the heating shell, and a heat insulation layer at the bottom of the support frame. While this application improves the stability of the device through optimized support frame design, its single-layer spiral structure still has limitations in heat distribution and heating efficiency; the aforementioned patent can corroborate the shortcomings of the prior art.

[0004] Therefore, we have made improvements to this and proposed a multi-layer spiral structure electric heating wire heating device. Utility Model Content

[0005] The purpose of this invention is to solve the problems of uneven heat distribution, local overheating, and limited heating efficiency in existing electric heating wire heating devices.

[0006] To achieve the above objectives, this utility model provides a multi-layer spiral heating wire heating device, including a heating body and a multi-layer heat-conducting assembly. The heating body has an internal support frame, and a main shaft is fixedly installed at the center of the support frame. Several layers of spiral heating wire assemblies are sequentially sleeved on the outside of the main shaft, and adjacent layers of spiral heating wire assemblies are separated by heat-conducting partitions. The heat-conducting partitions have heat dissipation grooves on their outer sides, and the heat dissipation grooves are evenly distributed along the radial direction of the heat-conducting partitions. Power connection terminals are provided at both ends of the heating body, and the power connection terminals are connected to each layer of spiral heating wire assemblies in series or parallel via wires.

[0007] The multi-layer spiral structure electric heating wire heating device also includes an outer shell fixedly installed on the outside of the heating body. The inner wall of the outer shell is provided with a heat insulation layer, and a cavity is formed between the heat insulation layer and the heating body. The cavity is filled with a heat-conducting medium. The heat-conducting medium is used to absorb and transfer the heat generated by the spiral electric heating wire assembly to the surface of the outer shell.

[0008] As a preferred technical solution of this application, the spiral heating wire assembly includes a first spiral heating wire, a second spiral heating wire, and a third spiral heating wire. The first spiral heating wire, the second spiral heating wire, and the third spiral heating wire are respectively wound around different height positions of the main shaft, and the spacing between adjacent layers of spiral heating wires is equal. The pitch of the first spiral heating wire is greater than the pitch of the second spiral heating wire, and the pitch of the second spiral heating wire is greater than the pitch of the third spiral heating wire.

[0009] As a preferred technical solution of this application, a through hole is provided at the center of the heat-conducting partition, and a wear-resistant coating is provided on the inner wall of the through hole. The main shaft passes through the through hole and is clearance-fitted with the inner wall of the through hole. Several protrusions are provided on the outer edge of the heat-conducting partition, and the protrusions contact the inner wall of the heating body and are fixedly connected by bolts.

[0010] As a preferred technical solution of this application, the heat dissipation groove has a trapezoidal cross-section, the bottom width of the heat dissipation groove is smaller than the top width, and the inner wall of the heat dissipation groove is coated with a high-temperature resistant coating; the thickness of the heat-conducting partition gradually decreases from the center to the edge to reduce heat loss during the transfer process.

[0011] As a preferred technical solution of this application, the outer side of the outer shell is provided with a plurality of heat dissipation fins, the heat dissipation fins are evenly distributed along the axial direction of the outer shell, and the surface of the heat dissipation fins is provided with an anti-oxidation coating; the thickness of the heat insulation layer gradually increases from the top to the bottom of the outer shell to adapt to the heat dissipation needs of different parts.

[0012] As a preferred technical solution of this application, the thermally conductive medium is liquid metal or thermally conductive silicone grease. The thermally conductive medium is injected into the cavity through an injection port located at the top of the outer shell and sealed by a sealing cap. The bottom of the cavity is provided with an outlet for discharging excess thermally conductive medium.

[0013] As a preferred technical solution of this application, the power connection terminal includes a positive terminal and a negative terminal, which are respectively connected to the first spiral heating wire, the second spiral heating wire and the third spiral heating wire via wires; the outer side of the wire is wrapped with a high-temperature resistant insulation layer, the thickness of which is 0.5mm-1mm.

[0014] As a preferred technical solution of this application, a temperature sensor is provided on the top of the heating body, and the probe of the temperature sensor extends into the cavity and contacts the heat-conducting medium; the temperature sensor is connected to an external controller through a signal line, and the external controller is used to monitor the temperature change of the heating body in real time.

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

[0016] By assembling a multi-layered spiral heating wire assembly, spiral heating wires with different pitches are arranged in layers, allowing heat to be evenly distributed at different heights. Simultaneously, the heat dissipation groove design of the heat-conducting baffle effectively improves heat transfer efficiency and reduces localized overheating. Furthermore, the introduction of a heat-conducting medium further enhances heat conduction, significantly improving the overall performance of the heating device. This structural design solves the problems of uneven heat distribution, low heating efficiency, and short service life in traditional single-layer spiral heating wire devices, meeting the demands of industrial heating equipment for efficient and stable heating. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a partial structural schematic diagram of the present invention;

[0019] Figure 3 This is a schematic diagram of the thermally conductive partition.

[0020] Figure 4 This is a schematic diagram of the main shaft.

[0021] The attached figures are labeled as follows:

[0022] 1. Heating body; 2. Support frame; 3. Main shaft; 4. First spiral heating wire; 5. Second spiral heating wire; 6. Third spiral heating wire; 7. Thermally conductive partition; 8. Heat dissipation groove; 9. Outer shell; 10. Insulation layer; 11. Thermally conductive medium; 12. Heat dissipation fins; 13. Power connection terminal; 14. Temperature sensor; 15. Inlet; 16. Outlet. Detailed Implementation

[0023] This utility model provides a multi-layer spiral structure electric heating wire heating device, which is described below in conjunction with the appendix. Figure 1 To be continued Figure 4 The specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. The heating device includes a heating body 1, a support frame 2, a main shaft 3, a multi-layer spiral heating wire assembly, a heat-conducting partition 7, an outer shell 9, a heat insulation layer 10, a heat-conducting medium 11, and a power connection terminal 13, etc. The connection relationship, positional relationship and mutual cooperation relationship between the components are as follows.

[0024] like Figure 1 and Figure 2 As shown, a support frame 2 is provided inside the heating body 1. The support frame 2 is fixed at the center of the heating body 1 to provide stability for the overall structure. The main shaft 3 passes through the support frame 2 and is fixedly installed at the center of the heating body 1. A first spiral heating wire 4, a second spiral heating wire 5, and a third spiral heating wire 6 are sequentially sleeved on the outside of the main shaft 3, forming a multi-layer spiral heating wire assembly. The first spiral heating wire 4 is located in the innermost layer and has the largest pitch; the second spiral heating wire 5 is located in the middle layer and has the next largest pitch; the third spiral heating wire 6 is located in the outermost layer and has the smallest pitch. Adjacent spiral heating wire layers are separated by a heat-conducting partition 7. A through hole is opened in the center of the heat-conducting partition 7. The main shaft 3 passes through the through hole and is clearance-fitted with the inner wall of the through hole to ensure that there is no excessive friction between the main shaft 3 and the heat-conducting partition 7. Several protrusions are provided on the outer edge of the heat-conducting partition 7. The protrusions contact the inner wall of the heating body 1 and are fixedly connected by bolts, thereby firmly fixing the heat-conducting partition 7 inside the heating body 1.

[0025] like Figure 3 As shown, the outer side of the heat-conducting partition 7 is provided with heat dissipation grooves 8, which are uniformly distributed radially along the heat-conducting partition 7. The grooves 8 have a trapezoidal cross-section, with the bottom width smaller than the top width. The design of the heat dissipation grooves 8 allows heat to be rapidly diffused after being transferred from the spiral heating wire assembly to the heat-conducting partition 7. Simultaneously, the inner wall of the heat dissipation grooves 8 is coated with a high-temperature resistant coating to improve its heat resistance. The thickness of the heat-conducting partition 7 gradually decreases from the center to the edge; this design helps reduce heat loss during the transfer process, allowing heat to be transferred outwards more efficiently.

[0026] like Figure 1 and Figure 4 As shown, a housing 9 is fixedly installed on the outer side of the heating body 1. A heat insulation layer 10 is provided on the inner wall of the housing 9, forming a cavity between the heat insulation layer 10 and the heating body 1. This cavity is filled with a thermally conductive medium 11. The thermally conductive medium 11 is liquid metal or thermally conductive silicone grease, injected into the cavity through an injection port 15 and sealed with a sealing cap. The injection port 15 is located at the top of the housing 9, while an outlet 16 is provided at the bottom of the cavity to drain excess thermally conductive medium 11. The function of the thermally conductive medium 11 is to absorb the heat generated by the spiral heating wire assembly and transfer it to the surface of the housing 9, thereby achieving efficient heat conduction. Several heat dissipation fins 12 are provided on the outer side of the housing 9. These fins are evenly distributed along the axial direction of the housing 9, and their surfaces are coated with an anti-oxidation coating to prevent performance degradation due to oxidation during long-term use. The thickness of the heat insulation layer 10 gradually increases from the top to the bottom of the housing 9. This design allows for adjustment of the heat insulation effect according to the heat dissipation requirements of different parts, thereby optimizing the overall heat dissipation performance.

[0027] like Figure 1 and Figure 2 As shown, power connection terminals 13 are located at both ends of the heating body 1. Each power connection terminal 13 includes a positive terminal and a negative terminal, which are connected to the first spiral heating wire 4, the second spiral heating wire 5, and the third spiral heating wire 6 via wires, respectively. The outer side of the wires is wrapped with a high-temperature resistant insulation layer with a thickness of 0.5mm to 1mm to ensure that the insulation performance of the wires is not affected in high-temperature environments. The first spiral heating wire 4, the second spiral heating wire 5, and the third spiral heating wire 6 can be connected in series or in parallel via wires; the specific connection method can be selected according to the actual application scenario.

[0028] like Figure 4 As shown, a temperature sensor 14 is provided on the top of the heating body 1. The probe of the temperature sensor 14 extends into the cavity and contacts the heat-conducting medium 11. The temperature sensor 14 is connected to an external controller via a signal line. The external controller is used to monitor the temperature changes of the heating body 1 in real time. The design of the temperature sensor 14 allows the operator to monitor the operating status of the heating device at any time, thereby adjusting the heating power or taking other measures as needed.

[0029] In actual operation, when the power connection terminal 13 is connected to the power source, the first spiral heating wire 4, the second spiral heating wire 5, and the third spiral heating wire 6 begin to heat up. The heat is first transferred to the heat-conducting partition 7, which is in direct contact with it. Because the heat-conducting partition 7 has heat dissipation grooves 8, the heat can quickly diffuse outward through the heat dissipation grooves 8. Subsequently, the heat is transferred through the heat-conducting partition 7 to the inner wall of the heating body 1, and further transferred to the surface of the outer casing 9 through the heat-conducting medium 11. The heat dissipation fins 12 on the outer side of the outer casing 9 can accelerate heat dissipation, thereby effectively reducing the overall temperature of the device. The design of the insulation layer 10 ensures that heat is mainly transferred outward through the heat-conducting medium 11, and does not dissipate significantly into the surrounding environment, thus improving energy utilization efficiency.

[0030] In industrial applications, this heating device can be widely used in scenarios requiring uniform heating, such as plastic processing, food drying, and chemical reactions. By adjusting the pitch of the first spiral heating wire 4, the second spiral heating wire 5, and the third spiral heating wire 6, as well as the thickness distribution of the heat-conducting partition 7, heating requirements under different operating conditions can be met. Furthermore, the introduction of the temperature sensor 14 enables the device to have intelligent control capabilities, allowing operators to adjust the heating power based on real-time monitored temperature data, thereby achieving more precise temperature control.

[0031] This invention achieves uniform heat distribution and efficient heat transfer through the aforementioned structural design, solving the problems of uneven heat distribution, localized overheating, and low heating efficiency in traditional single-layer spiral heating wire devices. The connection and positional relationships between the various components are carefully designed to ensure the stability and reliability of the entire device, while also facilitating actual production and maintenance.

[0032] To enable those skilled in the art to fully understand and implement this utility model, the following supplementary explanation of the operating principle and implementation steps of this utility model is provided in conjunction with specific application scenarios.

[0033] In practical industrial applications, taking the heating scenario in plastic processing as an example, this multi-layer spiral heating wire device can be used for the uniform heating of molten plastic granules. By adjusting the pitch of each layer of spiral heating wire and the thickness distribution of the heat-conducting partitions, the requirements of different temperature gradients can be met, while ensuring the uniformity of heat transfer. The following is a step-by-step explanation of the operation process.

[0034] First, during the initial installation phase, the operator needs to fix the outer casing 9 to the outside of the heating body 1 and inject liquid metal or thermal grease into the cavity as the heat transfer medium 11 through the injection port 15. The injection port 15 is located at the top of the outer casing 9, making it convenient for the operator to inject the medium from above, while the outlet 16 is located at the bottom of the cavity to discharge excess heat transfer medium 11, thereby avoiding pressure problems caused by excessive medium. The thickness of the insulation layer 10 gradually increases from the top to the bottom of the outer casing 9. This design allows heat to be concentrated mainly in the central area of ​​the heating body 1, reducing heat loss to the top of the outer casing 9 and thus improving energy utilization efficiency.

[0035] Secondly, when the power connection terminal 13 is connected to the power source, the first spiral heating wire 4, the second spiral heating wire 5, and the third spiral heating wire 6 begin to generate heat. Since the first spiral heating wire 4 has the largest pitch, the heat it generates is mainly concentrated in the inner layer of the heating body 1; the second spiral heating wire 5 has the next largest pitch, and its heat distribution is relatively wide; the third spiral heating wire 6 has the smallest pitch, and its heat coverage is the widest and most uniform. Through this layered arrangement, heat can be distributed in a gradient at different heights, thus avoiding localized overheating. Furthermore, adjacent spiral heating wires are separated by a heat-conducting partition 7. The heat dissipation grooves 8 on the heat-conducting partition 7 are evenly distributed radially, and their trapezoidal cross-section design allows heat to quickly diffuse to the inner wall of the heating body 1, further improving the efficiency of heat transfer.

[0036] Subsequently, heat is transferred to the inner wall of the heating body 1 through the heat-conducting partition 7 and then enters the cavity formed by the heat insulation layer 10 and the heating body 1. The heat-conducting medium 11 absorbs heat and transfers it to the surface of the outer shell 9. The heat dissipation fins 12 on the outer side of the outer shell 9 are evenly distributed along the axial direction, and the anti-oxidation coating on their surface can effectively prevent performance degradation due to oxidation during long-term use. The heat dissipation fins 12 accelerate heat dissipation by increasing the heat dissipation area, thereby effectively reducing the overall temperature of the device. The design of the heat insulation layer 10 ensures that heat is mainly transferred to the outside through the heat-conducting medium 11, and is not lost in large quantities to the surrounding environment, further improving energy utilization efficiency.

[0037] During operation, the probe of temperature sensor 14 extends into the cavity and contacts the heat-conducting medium 11 to monitor the temperature changes of the heating body 1 in real time. Temperature sensor 14 is connected to an external controller via a signal line. The external controller dynamically adjusts the output power of the power connection terminal 13 based on the monitored temperature data, thereby achieving precise temperature control. For example, during the melting process of plastic granules, if the temperature is too high, it may cause the material to decompose. In this case, the external controller will reduce the heating power; conversely, if the temperature is insufficient, it will increase the heating power to ensure the melting effect.

[0038] Through the above steps, this heating device achieves uniform heat distribution and efficient heat transfer, solving the problems of uneven heat distribution, localized overheating, and low heating efficiency in traditional single-layer spiral heating wire devices. The connections and positions of the various components are carefully designed to ensure the stability and reliability of the entire device. Furthermore, the device is easy to operate, has low maintenance costs, and is suitable for various industrial scenarios requiring uniform heating, such as food drying and chemical reactions.

[0039] In summary, this utility model significantly improves the performance of the heating device through the synergistic effect of the multi-layer spiral heating wire assembly, the thermally conductive partition 7, the thermally conductive medium 11, and the heat dissipation fins 12, thus meeting the requirements of industrial heating equipment for efficient and stable heating. The above are merely specific embodiments of this utility model; any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-layer spiral structure electric heating wire heating device, characterized in that, The heating body (1) includes a heating element (1) and a multi-layer heat-conducting assembly. The heating element (1) has a support frame (2) inside. A main shaft (3) is fixedly installed at the center of the support frame (2). Several layers of spiral heating wire assemblies are sequentially sleeved on the outside of the main shaft (3). Adjacent spiral heating wire assemblies are separated by a heat-conducting partition (7). The heat-conducting partition (7) has a heat dissipation groove (8) on its outside. The heat dissipation groove (8) is evenly distributed along the radial direction of the heat-conducting partition (7). Power connection terminals (13) are provided at both ends of the heating element (1). The power connection terminals (13) are connected to each layer of spiral heating wire assemblies in series or in parallel through wires.

2. The multi-layer spiral structure electric heating wire heating device according to claim 1, characterized in that, It also includes an outer shell (9) fixedly installed on the outside of the heating body (1), the inner wall of the outer shell (9) is provided with a heat insulation layer (10), a cavity is formed between the heat insulation layer (10) and the heating body (1), and the cavity is filled with a heat-conducting medium (11).

3. The multi-layer spiral structure electric heating wire heating device according to claim 1, characterized in that, The spiral heating wire assembly includes a first spiral heating wire (4), a second spiral heating wire (5), and a third spiral heating wire (6). The first spiral heating wire (4), the second spiral heating wire (5), and the third spiral heating wire (6) are wound around the main shaft (3) at different height positions, and the spacing between adjacent spiral heating wires is equal. The pitch of the first spiral heating wire (4) is greater than the pitch of the second spiral heating wire (5), and the pitch of the second spiral heating wire (5) is greater than the pitch of the third spiral heating wire (6).

4. The multi-layer spiral structure electric heating wire heating device according to claim 1, characterized in that, The heat-conducting partition (7) has a through hole at its center, and the inner wall of the through hole is coated with a wear-resistant coating. The main shaft (3) passes through the through hole and is in clearance fit with the inner wall of the through hole. The outer edge of the heat-conducting partition (7) has several protrusions, and the protrusions are in contact with the inner wall of the heating body (1) and are fixedly connected by bolts.

5. The multi-layer spiral structure electric heating wire heating device according to claim 1, characterized in that, The heat dissipation groove (8) has a trapezoidal cross-section, the bottom width of the heat dissipation groove (8) is smaller than the top width, and the inner wall of the heat dissipation groove (8) is coated with a high temperature resistant coating; the thickness of the heat-conducting partition (7) gradually decreases from the center to the edge.

6. A multi-layer spiral structure electric heating wire heating device according to claim 2, characterized in that, The outer side of the outer shell (9) is provided with a plurality of heat dissipation fins (12), which are evenly distributed along the axial direction of the outer shell (9). The surface of the heat dissipation fins (12) is provided with an anti-oxidation coating. The thickness of the heat insulation layer (10) gradually increases from the top to the bottom of the outer shell (9).

7. A multi-layer spiral structure electric heating wire heating device according to claim 2, characterized in that, The thermally conductive medium (11) is liquid metal or thermally conductive silicone grease. The thermally conductive medium (11) is injected into the cavity through the injection port (15). The injection port (15) is located at the top of the outer shell (9) and is sealed by a sealing cap. The bottom of the cavity is provided with an outlet (16).

8. The multi-layer spiral structure electric heating wire heating device according to claim 1, characterized in that, The heating body (1) is provided with a temperature sensor (14) on its top. The probe of the temperature sensor (14) extends into the cavity and contacts the heat-conducting medium (11). The temperature sensor (14) is connected to an external controller via a signal line.

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