Coiled tube electric heater

Abstract

The application provides a coil type electric heater, which comprises a shell, a containing cavity is arranged in the shell, a heat exchange medium is arranged in the containing cavity, at least one heat exchange pipe is arranged, the heat exchange pipe comprises a heating medium inlet end, a heating medium outlet end and a heat exchange part between the heating medium inlet end and the heating medium outlet end, the heat exchange part is arranged in the containing cavity, and the application further comprises a heating assembly arranged on the shell, the heating assembly comprises a plurality of electric heating pipes for heating the heat exchange medium. The application is provided with at least one heat exchange pipe, the heat exchange part of the heat exchange pipe is arranged in the containing cavity, the heated medium in the heat exchange pipe can be heated after the heat exchange medium in the containing cavity is heated by the heating assembly, the heat exchange pipe isolates the heating medium from the electric heating element, the high-pressure working condition of the heated medium can be met, the heating process is clean and non-polluting to the medium, and the application has the advantages of improving the heat exchange efficiency and the heating uniformity.

Description

Technical Field

[0001] This invention relates to the field of heating device technology, and more particularly to a coil-type electric heater. Background Technology

[0002] An electric heater is a general-purpose heating device that efficiently converts electrical energy into heat energy. Its core working principle is based on the current heating effect, thereby achieving the goals of heating, heat preservation, or drying of the medium. It is widely used in many fields such as industrial production, civil heating, chemical reaction, and equipment heat tracing.

[0003] In existing technologies, conventional electric heaters mostly adopt direct heating methods. Their core structural feature is that the heating element is in direct contact with the heated medium, and heat can be directly transferred to the medium. They have the advantages of simple structure, low manufacturing cost, and high instantaneous heating efficiency, and have been widely used in ordinary low-pressure scenarios where there are no special requirements for the cleanliness of the medium (such as household water heaters and small heaters). However, as industrial production develops towards refinement and high-end, the limitations of this direct heating method are becoming increasingly apparent, especially in meeting the requirements for high-pressure media and high cleanliness. On the one hand, when the heated medium is in a high-pressure environment (such as high-pressure oil circuits or media inside high-pressure reactors), the direct-contact heating element is difficult to seal, which can easily lead to safety hazards such as media leakage and high-pressure penetration. Moreover, the heating element is prone to aging and damage when exposed to high pressure for a long time, affecting the service life and operational stability of the equipment. On the other hand, when the heating element is in direct contact with the medium, scale, carbon deposits, or oxide flakes are easily generated on its surface. These impurities will mix into the heated medium, damaging its cleanliness and failing to meet the stringent requirements for media purity in fields such as electronics, pharmaceuticals, food, and fine chemicals. At the same time, the adhesion of impurities can also reduce heating efficiency, increase energy consumption, and even cause the heating element to overheat and be damaged. Summary of the Invention

[0004] This invention provides a coil-type electric heater to solve the technical problem of direct contact between the heating element and the heated medium in the prior art.

[0005] The present invention provides a coil-type electric heater, the coil-type electric heater comprising: The housing has a receiving cavity, and a heat exchange medium is provided inside the receiving cavity; At least one heat exchange tube, the heat exchange tube including a heating medium inlet end, a heating medium outlet end, and a heat exchange section located between the heating medium inlet end and the heating medium outlet end, the heat exchange section being located within the accommodating cavity; A heating assembly is disposed on the housing, and the heating assembly includes a plurality of electric heating tubes for heating the heat exchange medium.

[0006] In one embodiment of the present invention, the heat exchange section is arranged in a spiral shape along the axial direction of the shell. When there are multiple heat exchange tubes, the spiral diameter formed by any one of the heat exchange sections is different, and the heat exchange sections corresponding to the multiple heat exchange tubes are distributed sequentially from the inside to the outside along the radial direction of the shell.

[0007] In one embodiment of the present invention, the housing is provided with a cover plate, the cover plate is provided with a medium inlet pipe and a medium outlet pipe, the heating medium inlet end of the heat exchange tube is connected to the medium inlet pipe, and the heating medium outlet end of the heat exchange tube is connected to the medium outlet pipe.

[0008] In one embodiment of the present invention, a fixing plate is provided inside the housing, and a plurality of fixing blocks are spaced apart along the circumference of the fixing plate. The extension direction of the length of the fixing blocks is consistent with the axial direction of the housing. A plurality of positioning rings are provided on the fixing blocks, and the heat exchange part passes through the positioning rings and is fixed by the positioning rings.

[0009] In one embodiment of the present invention, the heating assembly further includes a junction box disposed on the cover plate, the electric heating tube has a connecting end and a heating end, the input end of the electric heating tube is electrically connected to the junction box, and the heating end of the electric heating tube passes through the cover plate and is used to heat the heat exchange medium in the accommodating cavity.

[0010] In one embodiment of the present invention, the housing is provided with a heat exchange medium inlet and outlet pipe, which is used to add heat exchange medium into the accommodating cavity or to discharge heat exchange medium from the accommodating cavity. The housing is also provided with a pressure relief port.

[0011] In one embodiment of the present invention, at least one temperature detector is provided on the housing, the detection end of the temperature detector is located inside the accommodating cavity, and is used to detect the temperature of the heat exchange medium.

[0012] In one embodiment of the present invention, the heating medium inlet, the heat exchange section and the heating medium outlet are integrally arranged.

[0013] In one embodiment of the present invention, the housing is provided with an overflow pipe and a drain pipe.

[0014] In one embodiment of the present invention, the coil-type electric heater further includes a base, and the housing is detachably connected to the base.

[0015] The beneficial effects of the present invention are as follows: The coil-type electric heater proposed in this invention uses at least one heat exchange tube, with the heat exchange portion of the heat exchange tube located within a accommodating cavity. When the heat exchange medium in the accommodating cavity is heated by the heating component, the medium to be heated in the heat exchange tube can also be heated. Furthermore, the heat exchange tube isolates the heating medium from the electric heating element, which can meet the requirements of high-pressure conditions for the heated medium. Moreover, the heating process is clean and pollution-free for the medium. Compared with related technologies, this application can improve the quality of the heated medium and achieve efficient heat exchange, thus having the advantages of improved heat exchange efficiency and heating uniformity. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of a coil-type electric heater provided in an embodiment of the present invention; Figure 2 This is a cross-sectional schematic diagram of a coil-type electric heater provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a heating assembly provided in one embodiment of the present invention; Figure 4 This is a schematic diagram of the assembly of the heat exchange tube and the fixing block provided in one embodiment of the present invention; Figure 5 This is one embodiment of the present invention. Figure 4 Enlarged view of point A; Figure 6 This is a schematic diagram of the structure of a heat exchange tube provided in one embodiment of the present invention.

[0018] The attached figures are labeled as follows: 1. Shell 2. Cover plate 3. Receiving cavity 4. Heating component 5. Junction box 6. Electric heating tube 7. Connecting flange 8. Medium inlet pipe 9. Medium outlet pipe 10. Heat exchange tube 11. Heating medium inlet end 501. Heating medium outlet end 502. Heat exchange section 503. Fixing plate 6. Fixing block 7. Positioning ring 8. Base 9. Heat exchange medium inlet and outlet pipes 10. Pressure relief port 11. Temperature detector 12. Overflow pipe 13. Drain pipe 14. Detailed Implementation

[0019] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0020] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the shape, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0021] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0022] like Figure 1 - Figure 6 As shown, the present invention provides a coil-type electric heater.

[0023] In one exemplary embodiment, the coil-type electric heater includes a housing 1 with a receiving cavity 102 containing a heat exchange medium. The housing 1 serves as the external structure of the coil-type electric heater, providing overall support and protection and defining the internal receiving cavity 102. The application also includes at least one heat exchange tube 5, which includes a heating medium inlet end 501, a heating medium outlet end 502, and a heat exchange section 503 located between the heating medium inlet end 501 and the heating medium outlet end 502, within the receiving cavity 102. Furthermore, the application includes a heating assembly 2 disposed on the housing 1, which includes multiple electric heating tubes 202 for heating the heat exchange medium.

[0024] In this embodiment, at least one heat exchange tube 5 is provided, and the heat exchange part 503 of the heat exchange tube 5 is located in the accommodating cavity 102. When the heat exchange medium in the accommodating cavity 102 is heated by the heating component 2, the heated medium in the heat exchange tube 5 can be heated. The heat exchange tube 5 isolates the heated medium from the electric heating element, which can meet the requirement that the heated medium is under high pressure. Moreover, the heating process is clean and does not pollute the medium. Compared with related technologies, this application can achieve efficient heat exchange and has the advantages of improving heat exchange efficiency and heating uniformity.

[0025] In this embodiment, the heating medium inlet 501 and the heating medium outlet 502 are used to introduce the medium to be heated into the accommodating cavity 102 to exchange heat with the heat exchange medium to achieve heating. The medium to be heated includes, but is not limited to, liquid, gas and other forms of medium, and the medium to be heated can be under high pressure or normal pressure.

[0026] In this embodiment, the shell 1 is designed as a container with an internal space, which is defined as the accommodating cavity 102. The accommodating cavity 102 is filled with a heat exchange medium. Specifically, the shell 1 can be a container with a closed structure, such as a cylindrical or rectangular container, whose internal space constitutes the accommodating cavity 102. In this embodiment, the accommodating cavity 102 is maintained at atmospheric pressure, and correspondingly, the heat exchange medium in the accommodating cavity 102 is also at atmospheric pressure. In this embodiment, a cylindrical container is used. The heat exchange medium can be selected as a liquid with good thermal conductivity, such as water, heat transfer oil, or ethylene glycol solution, which is introduced and fills the accommodating cavity 102.

[0027] In this embodiment, the heat exchange tube 5 is configured to have a heating medium inlet end 501, a heating medium outlet end 502, and a heat exchange section 503 located between the heating medium inlet end 501 and the heating medium outlet end 502. The heat exchange section 503 is located within the accommodating cavity 102. Alternatively, the heat exchange tube 5 can be one or more metal pipes, such as stainless steel or copper pipes. The heating medium inlet end 501 and the heating medium outlet end 502 of the heat exchange tube 5 can be simply led out through openings in the wall of the housing 1 and connected via external pipes. The heat exchange section 503 is directly immersed in the heat exchange medium within the accommodating cavity 102 to achieve heat transfer.

[0028] It is understood that in this embodiment, for a single heat exchange tube 5, the heating medium inlet end 501, the heat exchange section 503, and the heating medium outlet end 502 are integrated. This integrated design ensures that the entire heat exchange tube 5 has no splicing gaps or connection gaps, avoiding the problems of impurities and dirt accumulation in gaps, or the aging and falling off of seals that can mix into the medium. At the same time, compared with the defects of existing direct heating methods where the heating element directly contacts the medium, resulting in scale, carbon deposits, and oxidation flaking, the integrated heat exchange tube 5 can achieve physical isolation between the heating element and the heated medium through indirect heating, fundamentally preventing impurities from mixing into the heated medium.

[0029] For example, in this embodiment, the heat exchange tube 5 can be formed by welding the medium inlet end, the heat exchange part 503 and the medium outlet end together, or by directly forming it into the required shape using a tube blank bending process, so as to ensure that the entire heat exchange tube 5 is seamless.

[0030] In some embodiments, the heat exchange section 503 is arranged in a spiral shape along the axial direction of the housing 1. When there are multiple heat exchange tubes 5, the spiral diameter formed by any heat exchange section 503 is different. The heat exchange sections 503 corresponding to the multiple heat exchange tubes 5 are distributed sequentially from the inside to the outside along the radial direction of the housing 1.

[0031] In this embodiment, the heat exchange area is effectively increased and the heat exchange efficiency is improved by arranging the heat exchange section 503 in a spiral shape. When multiple heat exchange tubes 5 are used, by making the spiral diameters of different heat exchange sections 503 different and distributing them sequentially from the inside to the outside along the radial direction of the shell 1, a compact and efficient arrangement of multiple heat exchange tubes 5 within the limited accommodating cavity 102 space is achieved. This not only avoids mutual interference between heat exchange tubes 5, but also allows the heat exchange medium to exchange heat more evenly with each layer of heat exchange tubes 5, thereby improving the overall heat exchange performance and power density of the coil-type electric heater, while maintaining the compactness of the equipment and meeting the needs of high flow rate or high power heating.

[0032] For example, in this embodiment, the helical structure of the heat exchange section 503 can be achieved by winding a straight pipe on a dedicated device or by assembling pre-prepared helical pipe segments. The winding direction and pitch of the helix can be adaptively designed according to the flow characteristics of the heat exchange medium and the heat exchange requirements.

[0033] It is understandable that when there are multiple heat exchange tubes 5, the different helical diameters of any heat exchange section 503 mean that the helical portion of each heat exchange tube 5 has a unique diameter. The different diameters of the helical portions of each heat exchange tube 5 are designed to achieve a compact arrangement of multiple heat exchange tubes 5 within the limited radial space of the shell 1, avoiding physical interference between different heat exchange tubes 5. By controlling the helical diameters of different heat exchange tubes 5, the necessary spatial conditions can be provided for subsequent radial distribution. Specifically, different heat exchange sections 503 can be designed with a smaller helical diameter for the inner heat exchange tubes 5, while the helical diameters of the outer heat exchange tubes 5 increase sequentially.

[0034] Meanwhile, in this embodiment, the multiple heat exchange sections 503 are arranged in a radially nested configuration to achieve high power density and efficient heat exchange. This allows multiple heat exchange tubes 5 with different spiral diameters to be arranged concentrically or nearly concentrically within the cross-section of the shell 1. This not only maximizes the fill rate of the heat exchange tubes 5 in the limited space and effectively utilizes the volume of the accommodating cavity 102, but also enables the heat exchange medium to flow sequentially through different levels of heat exchange tubes 5 for sufficient heat exchange, thereby further improving the overall heat exchange performance.

[0035] In some embodiments, the housing 1 is provided with a cover plate 101, on which a medium inlet pipe 3 and a medium outlet pipe 4 are provided. The heating medium inlet end 501 of the heat exchange tube 5 is connected to the medium inlet pipe 3, and the heating medium outlet end 502 of the heat exchange tube 5 is connected to the medium outlet pipe 4.

[0036] In this embodiment, a cover plate 101 is provided on the shell 1 of the coil-type electric heater, and a medium inlet pipe 3 and a medium outlet pipe 4 are integrated on the cover plate 101. Simultaneously, the heating medium inlet end 501 and heating medium outlet end 502 of the heat exchange tube 5 are reliably connected to their respective ends, constructing a complete, closed, and controllable fluid circulation path. This not only solves the problem of ineffective introduction and export of heat exchange fluid, ensuring that the fluid can flow stably and continuously through the heat exchange tube 5 for efficient heat exchange, but also maintains the sealing of the heat exchange medium within the accommodating cavity 102, preventing leakage and external contamination, thereby improving the operational reliability, heat exchange efficiency, and overall safety of the coil-type electric heater.

[0037] Exemplarily, the cover plate 101 is used to close the opening at the top of the housing 1 to form a sealed accommodating cavity 102. The cover plate 101 can be connected to the housing 1 in various ways, such as by bolts, flanges, or welding, to ensure the reliability and sealing of the connection and prevent leakage of the heat exchange medium in the accommodating cavity 102 or the entry of external impurities. The material of the cover plate 101 should be compatible with the housing 1 and the internal heat exchange medium; for example, corrosion-resistant materials such as stainless steel or carbon steel can be used.

[0038] For example, in this embodiment, the medium inlet pipe 3 and the medium outlet pipe 4 are channels that establish a connection between the heated medium and the heat exchange tube 5. The medium inlet pipe 3 is responsible for introducing the fluid to be heated or cooled into the heat exchange tube 5, while the medium outlet pipe 4 is responsible for discharging the fluid after heat exchange. The medium inlet pipe 3 and the medium outlet pipe 4 are typically securely installed on the cover plate 101 by means of welding, threaded connection, or flange connection, so as to connect with the corresponding ends of the heat exchange tube 5. In this embodiment, the size and material of the pipes are optimized according to the actual process parameters such as fluid type, flow rate, pressure, and temperature.

[0039] In this application, the coil-type electric heater exchanges heat with the heat exchange medium within the accommodating cavity 102 through the heat exchange section 503 of the heat exchange tube 5. However, during actual operation, the heat exchange section 503 may experience displacement, vibration, or deformation due to factors such as medium flow, temperature changes, or its own gravity. This may not only affect the heat exchange efficiency but may also cause interference or damage between the heat exchange section 503 and other components, thereby reducing the stability and service life of the equipment. Therefore, to improve the stability of the heat exchange tube 5 in this application, a fixing plate 6 is provided inside the shell 1. The fixing plate 6 has multiple fixing blocks 7 spaced apart along its circumference. The length extension direction of the fixing blocks 7 is consistent with the axial direction of the shell 1. Multiple positioning rings 8 are provided on the fixing blocks 7. The heat exchange section 503 passes through the positioning rings 8 and is fixed by the positioning rings 8.

[0040] In this embodiment, a fixing plate 6 is provided inside the shell 1 of the coil-type electric heater, and multiple fixing blocks 7 are spaced circumferentially on the fixing plate 6. The length extension direction of the fixing blocks 7 is consistent with the axial direction of the shell 1, thereby providing a multi-point, axially extending support foundation for the heat exchange section 503. Meanwhile, the positioning ring 8 in this embodiment can effectively solve the problems of displacement, vibration, and deformation that may occur in the heat exchange section 503 within the accommodating cavity 102. Specifically, the fixing plate 6, fixing blocks 7, and positioning ring 8 together constitute a stable support and positioning system, ensuring that the heat exchange section 503 maintains its preset geometric shape and position under conditions such as medium flow and temperature changes, avoiding interference between the heat exchange section 503 and other components, thereby improving the operational stability and reliability of the heat exchange tube 5. Simultaneously, by precisely fixing the heat exchange section 503, the optimal heat exchange distance between the heat exchange section 503 and the heat exchange medium can be maintained, thereby ensuring efficient and stable heat exchange performance and extending the service life of the coil-type electric heater.

[0041] For example, in this embodiment, the positioning ring 8 is a U-shaped kit, the end of which passes through the fixing block 7 and is locked by a nut.

[0042] For example, in this embodiment, multiple fixing blocks 7 are also provided along the radial direction of the housing 1. That is, a fixing block 7 is also provided between two adjacent heating parts. Multiple positioning rings 8 are also provided on the fixing block 7 to ensure the radial distance between two adjacent heating parts.

[0043] In some embodiments, the heating assembly 2 further includes a junction box 201, which is disposed on the cover plate 101. The electric heating tube 202 has a connection end and a heating end. The input end of the electric heating tube 202 is electrically connected to the junction box 201. The heating end of the electric heating tube 202 passes through the cover plate 101 and is used to heat the heat exchange medium in the accommodating cavity 102.

[0044] In this embodiment, by placing the junction box 201 of the heating assembly 2 on the cover plate 101 and electrically connecting the input end of the heat exchange tube 5 to the junction box 201, and having the heating end penetrate the cover plate 101 to heat the heat exchange medium in the accommodating cavity 102, a safe and convenient connection between the electric heating tube 202 and an external power source is achieved. Simultaneously, the electrical connection part (junction box 201) is effectively separated from the heating working part (heating end), and the cover plate 101 serves as a physical barrier and installation platform, ensuring the dryness and insulation of the electrical connection and reducing potential leakage risks. Furthermore, in this embodiment, integrating the junction box 201 onto the cover plate 101 makes the installation, disassembly, and maintenance of the electric heating tube 202 more convenient and faster, eliminating the need for large-scale disassembly of the entire housing 1, thus improving equipment maintenance efficiency and operational safety.

[0045] For example, in this embodiment, a connecting flange 203 is provided at the center of the cover plate 101, the junction box 201 is installed on the connecting flange 203, and the electric heating tube 202 passes through the connecting flange 203 and enters the accommodating cavity 102.

[0046] For example, in this embodiment, the heating end can be in various shapes such as U-shaped, W-shaped or straight rod-shaped within the accommodating cavity 102 according to design requirements, so as to maximize the contact area with the heat exchange medium and improve heating efficiency.

[0047] It is understood that in this embodiment, the electric heating tube 202 and the junction box 201 are electrically connected, and the connection method is existing technology, which will not be described in detail here.

[0048] In some embodiments, the housing 1 is provided with a heat exchange medium inlet / outlet pipe 10 and a pressure relief port 11. The heat exchange medium inlet / outlet pipe 10 is used to introduce a medium into the accommodating cavity 102 or to discharge the heat exchange medium in the accommodating cavity 102.

[0049] In this embodiment, by providing heat exchange medium inlet and outlet pipes 10, this application can effectively manage the heat exchange medium within the accommodating cavity 102. The provision of heat exchange medium inlet and outlet pipes 10 ensures that the heat exchange medium can be continuously or as needed replenished into the accommodating cavity 102, maintaining sufficient quantity and good thermal performance. Simultaneously, it also ensures that the heat exchange medium within the accommodating cavity 102 can be promptly discharged. The heat exchange medium inlet and outlet pipes 10 provided in this application can also effectively prevent the heat exchange medium from remaining in a static or contaminated state for extended periods, thereby ensuring the quality and heat exchange efficiency of the heat exchange medium, extending the service life of the equipment, and simplifying maintenance operations. Furthermore, the pressure relief port 11 provided in this application can effectively prevent the vaporization of some heat exchange medium within the accommodating cavity 102, causing a pressure increase. When the pressure within the accommodating cavity 102 increases, the internal pressure of the accommodating cavity 102 can be balanced through the pressure relief port 11.

[0050] For example, in this embodiment, the heat exchange medium inlet and outlet pipe 10 is welded to the cover plate 101, and the pressure relief port 11 is also welded to the cover plate via a pipe.

[0051] It is understood that the function of the medium outlet pipe 11 is to discharge or circulate the heat exchange medium within the containment cavity 102. For example, when the heat exchange medium needs to be replaced, cleaned, or maintained, the old medium can be discharged through the medium outlet pipe 11. In another embodiment, the medium outlet pipe 11 can also be connected to an external cooling or filtration system to form a circulation loop, so that the heat exchange medium in the containment cavity 102 is discharged through the medium outlet pipe 11 after being heated, and then re-injected through the medium inlet pipe 10 after treatment, thereby achieving continuous circulation and temperature control of the medium.

[0052] In an exemplary embodiment, at least one temperature detector 12 is provided on the housing 1. The detection end of the temperature detector 12 is located inside the accommodating cavity 102 and is used to detect the temperature of the heat exchange medium.

[0053] In this embodiment, the detection end of the temperature detector 12 is located inside the accommodating cavity 102 to detect the temperature of the heat exchange medium in real time. Therefore, by using the temperature detector 12, the coil-type electric heater can continuously acquire the actual temperature data of the heat exchange medium, thus providing a basis for the heating assembly 2 to control the temperature of the heat exchange medium within the accommodating cavity 102, forming a closed-loop logic. Based on the real-time temperature data, the system can intelligently adjust the heating power to ensure that the heat exchange medium is maintained within the preset ideal temperature range, avoiding overheating or underheating.

[0054] For example, in this embodiment, the temperature detector 12 can be a variety of detection devices, such as resistance temperature detectors, thermocouples, or semiconductor temperature sensors.

[0055] For example, the temperature detector 12 can be fixed to the outside of the housing 1 and extend into the accommodating cavity 102 through a probe, or it can be mounted on the cover plate 101, or directly integrated into the wall of the housing 1, ensuring that it can effectively sense the temperature of the internal medium. Providing at least one temperature detector 12 allows for the configuration of one or more sensors according to actual needs, enabling more comprehensive temperature monitoring. The average value of data from multiple temperature detectors 12 is taken to avoid data deviation caused by the failure of a single temperature detector 12.

[0056] In one exemplary embodiment, the coil-type electric heater also includes a base 9, and a housing 1 is detachably connected to the base 9. The housing 1 is provided with an overflow pipe 13 and a drain pipe 14.

[0057] In this embodiment, the base 9 is used for the overall positioning and installation of the housing 1, while the overflow pipe 13 is used to drain when there is too much heat exchange medium, ensuring that the total amount of heat exchange medium in the accommodating cavity 102 is constant, and the drain pipe 14 is used to discharge the impurities that have settled at the bottom of the accommodating cavity 102.

[0058] For example, in this embodiment, the drain pipe 14 is located at the bottom of the housing 1, and the overflow pipe 13 is close to the top of the housing 1 and located on the outer peripheral surface of the housing 1.

[0059] For example, in this embodiment, the drain pipe 14 is provided with a drain valve. By opening the drain valve, the impurities at the bottom of the accommodating cavity 102 can be discharged.

[0060] In summary, this application, by setting at least one heat exchange tube 5, with the heat exchange section 503 of the heat exchange tube 5 located within the accommodating cavity 102, allows the heated medium within the heat exchange tube 5 to be heated after the heat exchange medium in the accommodating cavity 102 is heated by the heating component 2. Compared with related technologies, this application can achieve efficient heat exchange and has the advantages of improving heat exchange efficiency and heating uniformity.

[0061] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A coil-type electric heater, characterized in that, include: The housing has a receiving cavity, and a heat exchange medium is provided inside the receiving cavity; At least one heat exchange tube, the heat exchange tube including a heating medium inlet end, a heating medium outlet end, and a heat exchange section located between the heating medium inlet end and the heating medium outlet end, the heat exchange section being located within the accommodating cavity; A heating assembly is disposed on the housing, and the heating assembly includes a plurality of electric heating tubes for heating the heat exchange medium.

2. The coil-type electric heater according to claim 1, characterized in that: The heat exchange section is spirally arranged along the axial direction of the shell. When there are multiple heat exchange tubes, the spiral diameter formed by any one of the heat exchange sections is different. The heat exchange sections corresponding to the multiple heat exchange tubes are distributed sequentially from the inside to the outside along the radial direction of the shell.

3. The coil-type electric heater according to claim 1, characterized in that: The shell is provided with a cover plate, and the cover plate is provided with a medium inlet pipe and a medium outlet pipe. The heating medium inlet end of the heat exchange tube is connected to the medium inlet pipe, and the heating medium outlet end of the heat exchange tube is connected to the medium outlet pipe.

4. The coil-type electric heater according to claim 1, characterized in that: The housing is provided with a fixing plate, and the fixing plate is provided with a plurality of fixing blocks spaced apart along its circumference. The length of the fixing blocks extends in the same direction as the axial direction of the housing. The fixing blocks are provided with a plurality of positioning rings. The heat exchange part passes through the positioning rings and is fixed by the positioning rings.

5. The coil-type electric heater according to claim 3, characterized in that: The heating assembly also includes a junction box disposed on the cover plate. The electric heating tube has a connecting end and a heating end. The input end of the electric heating tube is electrically connected to the junction box. The heating end of the electric heating tube passes through the cover plate and is used to heat the heat exchange medium in the accommodating cavity.

6. The coil-type electric heater according to claim 1, characterized in that: The housing is provided with heat exchange medium inlet and outlet pipes, which are used to add heat exchange medium into the accommodating cavity or to discharge heat exchange medium from the accommodating cavity. The housing is also provided with a pressure relief port.

7. The coil-type electric heater according to claim 1, characterized in that: The housing is provided with at least one temperature detector, the detection end of which is located inside the accommodating cavity and is used to detect the temperature of the heat exchange medium.

8. The coil-type electric heater according to claim 1, characterized in that: The heating medium inlet, heat exchange section and heating medium outlet are integrated into one unit.

9. The coil-type electric heater according to claim 1, characterized in that: The shell is equipped with an overflow pipe and a drain pipe.

10. The coil-type electric heater according to claim 1, characterized in that: The coil-type electric heater also includes a base, and the housing is detachably connected to the base.

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