Heat generating device

Abstract

The utility model discloses a kind of heating devices, it is related to heating device technical field, and heating device includes thick film heating tube, second pipe body and fluid transmission pipe, thick film heating tube includes first pipe body and thick film heating element;Second pipe body is sleeved in the outer periphery of first pipe body, and with first pipe body encloses a vacuum cavity, thick film heating element is located in first pipe body, and is contained in vacuum cavity;Fluid transmission pipe is worn in first pipe body, and fluid transmission pipe is used to transmit fluid.The utility model discloses technical scheme by first pipe body and second pipe body enclose a vacuum cavity for containing thick film heating element, fluid transmission pipe is located in the inside of first pipe body, so that the heat generated by thick film heating element can more be transferred to the fluid medium to be heated in fluid transmission pipe inside towards the inside of first pipe body, reduce the situation that heat dissipates to surrounding environment by convection etc., to improve the heat utilization of heating device.

Description

Technical Field

[0001] This utility model relates to the field of heating device technology, and in particular to a heating device. Background Technology

[0002] Heating devices typically convert electrical energy or other forms of energy into heat energy for heating. However, the thermal efficiency of existing heating devices is often affected by various factors. Most existing heating devices use resistance heating, which generates heat by passing an electric current through a resistive element. Due to the temperature difference between the heating element and the environment, some heat inevitably escapes into the surrounding environment through radiation, convection, and other means, resulting in a reduction in the energy used to heat the target medium and thus lowering the thermal utilization rate. Utility Model Content

[0003] The main purpose of this invention is to provide a heating device that aims to improve the heat utilization rate of the heating device.

[0004] To achieve the above objectives, the heating device proposed in this utility model includes:

[0005] A thick-film heating tube includes a first tube body and a thick-film heating element;

[0006] The second tube is sleeved around the outer periphery of the first tube and together with the first tube forms a vacuum cavity. The thick film heating element is disposed in the first tube and housed within the vacuum cavity.

[0007] A fluid transfer tube is inserted into the first tube body and is used to transfer fluid.

[0008] In one embodiment, the heating device further includes an electrical connection terminal, the second tube body is provided with a through hole, the electrical connection terminal passes through the through hole and is electrically connected to the thick film heating element, and the electrical connection terminal is sealed to the through hole.

[0009] In one embodiment, a glass medium is provided between the electrical connection terminal and the via, and the glass medium is sintered to seal the electrical connection terminal in the via.

[0010] In one embodiment, the electrical connection terminal is welded to the thick-film heating element.

[0011] In one embodiment, the first tube body includes a heating section and two mounting sections connected in its axial direction. The heating section is disposed between the two mounting sections, the thick film heating element is disposed in the heating section, and the opposite ends of the second tube body are correspondingly connected to the outer peripheral wall of the mounting section.

[0012] In one embodiment, the second tube body includes, in its axial direction, a main body segment corresponding to the heating segment, a connecting segment connecting the mounting segment, and a transition segment disposed between the main body segment and the connecting segment. The diameter of the connecting segment is smaller than the diameter of the main body segment, and the transition segment extends obliquely from the connecting segment toward the main body segment in the axial direction of the second tube body.

[0013] In one embodiment, the fluid transmission pipe and the inner peripheral wall of the heating section enclose a transmission cavity, and are sealed to the inner peripheral walls of the two mounting sections.

[0014] In one embodiment, the transmission cavity is provided with guide ribs, which are connected to at least one of the inner peripheral wall of the heating section and the outer peripheral wall of the fluid transmission pipe, and the guide ribs extend spirally along the axial direction of the fluid transmission pipe.

[0015] In one embodiment, the guide rib is formed on the outer peripheral wall of the fluid transmission pipe and abuts against the inner peripheral wall of the heating section.

[0016] In one embodiment, the transmission cavity has interfaces at both ends along its axial direction. The interfaces are located on the inner circumferential wall of the fluid transmission pipe and are connected to the interfaces.

[0017] In one embodiment, the first tube body and the second tube body are welded by vacuum furnace brazing or vacuum electron beam welding.

[0018] In one embodiment, the first tube and the second tube are made of stainless steel.

[0019] In one embodiment, the first tube body is welded to the fluid transmission tube.

[0020] The technical solution of this utility model uses a first tube and a second tube to enclose a vacuum cavity for accommodating a thick-film heating element. A fluid transmission pipe for transmitting fluid is located inside the first tube. The vacuum environment formed between the first tube and the second tube can disrupt the convective heat transfer path, allowing more of the heat generated by the thick-film heating element to be transferred towards the inside of the first tube to the fluid medium to be heated in the fluid transmission pipe. This reduces the amount of heat dissipated into the surrounding environment through convection and other means, thereby improving the thermal utilization rate of the heating device. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the structure of an embodiment of the heating device provided by this utility model;

[0023] Figure 2 for Figure 1 Cross-sectional view of the heating device along the MM line;

[0024] Figure 3 for Figure 1 Exploded view of the heating device;

[0025] Figure 4 for Figure 3 A schematic diagram of a embodiment of a fluid transfer pipe;

[0026] Figure 5 for Figure 4 Cross-sectional view of the fluid transfer pipe.

[0027] Explanation of icon numbers:

[0028] 10. Heating device; 100. Thick-film heating element; 200. Second tube body; 300. Fluid transmission tube; 400. Electrical connection terminal; 500. Glass medium; 600. Vacuum chamber; 700. Transmission chamber; 110. First tube body; 111. Heating section; 112. Mounting section; 120. Thick-film heating element; 210. Through hole; 220. Main body section; 230. Connecting section; 240. Transition section; 310. Guide rib; 320. Interface; 330. Connecting pipe.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0033] This utility model proposes a heating device 10.

[0034] Please see Figures 1 to 3 In one embodiment of the present invention, the heating device 10 includes a thick-film heating tube 100, a second tube body 200, and a fluid transmission tube 300. The thick-film heating tube 100 includes a first tube body 110 and a thick-film heating element 120. The second tube body 200 is sleeved on the outer periphery of the first tube body 110 and together with the first tube body 110 form a vacuum cavity 600. The thick-film heating element 120 is disposed in the first tube body 110 and housed within the vacuum cavity 600. The fluid transmission tube 300 passes through the first tube body 110 and is used to transmit fluid.

[0035] Specifically, the thick-film heating element 100 includes a first tube body 110 and a thick-film heating element 120. The first tube body 110 is typically made of ceramic or metal, possessing good heat resistance and mechanical strength. The first tube body 110 provides a stable support platform and also acts as an insulating layer to prevent the thick-film heating element 120 from contacting the outside. The thick-film heating element 120, as the core component of the thick-film heating element 100, is used to generate heat and achieve the heating function. The thick-film heating element 120 is formed by printing and sintering conductive paste onto the surface of the first tube body 110. The conductive paste typically contains precious metal powders (such as platinum, palladium, etc.) and other additives. These materials are mixed and printed onto the first tube body 110 to form a film layer with a thickness of tens to hundreds of micrometers and a certain resistance value, thus forming a thick-film resistive layer. Furthermore, to prevent the thick-film resistive layer from directly contacting the external environment, a protective coating is usually applied to its outer surface. This protective layer not only improves the wear resistance of the thick-film resistive layer but also provides a certain degree of insulation to prevent short circuits or other safety problems caused by contact between the thick-film resistive layer and the outside environment. When current flows through the thick-film resistive layer, the electrical energy is converted into heat energy due to the resistance, causing the surface temperature of the thick-film resistive layer to rise, thus enabling the thick-film heating element 100 to generate heat. Understandably, the power supply provides current to the thick-film heating element 120 through the electrical connection terminal 400. When the current flows through the thick-film heating element 120, it encounters resistance, generating a Joule heating effect, which raises the temperature of the area where the thick-film heating element 120 is located. The generated heat is transferred to the first tube body 110 and other parts requiring heating through thermal conduction. The thick-film heating element 100 has relatively low manufacturing cost, high reliability, and can withstand high operating temperatures, making it widely applicable in applications requiring rapid heating and high-temperature heating.

[0036] The first tube 110 and the second tube 200 enclose a vacuum cavity 600, and a strong, sealed connection is achieved through welding. The thick-film heating element 120 is housed within the vacuum cavity 600. The vacuum environment within the vacuum cavity 600 reduces heat loss due to air convection. The heat generated by the thick-film heating element 120 after being energized needs to be transferred through the wall of the first tube 110 to its inner side to heat the fluid in the fluid transmission pipe 300. The fluid in the fluid transmission pipe 300 can be water, oil, or other liquids, or it can be a gas such as air. During heat transfer, the vacuum cavity 600 formed between the first tube 110 and the second tube 200 intercepts heat that is about to be transferred to the outside of the second tube 200, ensuring that more of the heat generated by the thick-film heating element 100 is transferred to the fluid medium to be heated within the fluid transmission pipe 300, thereby improving the thermal efficiency of the thick-film heating element 100.

[0037] Furthermore, in a vacuum environment, the thick-film heating element 120 is less prone to oxidation, reducing the possibility of corrosion and thus extending its service life. The vacuum chamber 600 provides some sound insulation, reducing noise generated during heating. It also isolates the external environment, preventing moisture from entering the circuit and causing short circuits, thus increasing safety. Additionally, the vacuum chamber 600 can be filled with thermally conductive media (such as thermal oil), which can better distribute the heat generated by the thick-film heating element 120 evenly across the entire heating surface, improving heat conduction.

[0038] The technical solution of this utility model uses a first tube 110 and a second tube 200 to enclose a vacuum cavity 600 for accommodating a thick-film heating element 120. A fluid transmission pipe 300 for transmitting fluid is located inside the first tube 110. The vacuum environment formed between the first tube 110 and the second tube 200 can disrupt the convective heat transfer path, allowing more of the heat generated by the thick-film heating element 120 to be transferred towards the inside of the first tube 110 to the fluid medium to be heated in the fluid transmission pipe 300. This reduces the amount of heat dissipated into the surrounding environment through convection and other means, thereby improving the thermal utilization rate of the heating device 10.

[0039] In one implementation, please refer to Figure 2 and Figure 3 The heating device 10 also includes an electrical connection terminal 400. The second tube 200 is provided with a through hole 210. The electrical connection terminal 400 passes through the through hole 210 and is electrically connected to the thick film heating element 120. The electrical connection terminal 400 and the through hole 210 are sealed together.

[0040] Electrical connection terminal 400 is used to connect an external power supply to the thick-film heating element 120, allowing current from the external power supply to flow through the electrical connection terminal 400 into the thick-film heating element 120, thereby enabling the thick-film heating element 120 to generate heat. The electrical connection terminal 400 is generally made of a metal material with good conductivity, such as copper or copper alloy, and is usually silver-plated or nickel-plated to enhance conductivity and corrosion resistance. Specifically, the electrical connection terminal 400 can be an electrode plate, probe connector, power cord, etc.

[0041] Electrical connection terminal 400 is electrically connected to thick-film heating element 120, which is formed by curing a conductive metal paste deposited on the surface of first tube body 110 using a screen printing process. Therefore, electrical connection terminal 400 effectively forms an electrical path with thick-film heating element 120. Electrical connection between electrical connection terminal 400 and thick-film heating element 120 can be achieved in various ways. For example, electrical connection terminal 400 can be directly soldered or bonded to thick-film heating element 120 with conductive adhesive to effectively conduct current into thick-film heating element 120 and ensure a good electrical connection between the two. Electrical connection terminal 400 can also be embedded in first tube body 110, which provides better mechanical stability and reduces connection loosening caused by vibration or thermal expansion.

[0042] The through-hole 210 on the second tube 200 is to allow the electrical connection terminal 400 to pass through the second tube 200 and establish an electrical connection with the thick-film heating element 120. Only one through-hole 210 can be provided, with multiple electrical connection terminals 400 passing through the same through-hole 210, but the electrical connection terminals 400 are insulated from each other by an insulating medium. Alternatively, multiple through-holes 210 can be provided at intervals, with multiple electrical connection terminals 400 passing through corresponding through-holes 210 respectively. The edges of the electrical connection terminals 400 and the through-holes 210 also need to be insulated. The electrical connection terminals 400 and the through-holes 210 are sealed together to ensure that the vacuum chamber 600 inside the heating device 10 is not affected by the external environment, preventing moisture, dust, and other impurities from entering. This also serves to provide electrical insulation and fix the electrical connection terminals 400.

[0043] In one implementation, please refer to Figure 2 and Figure 3 A glass medium 500 is provided between the electrical connection terminal 400 and the via 210. The glass medium 500 is sintered to seal the electrical connection terminal 400 in the via 210.

[0044] The glass medium 500 is typically sintered at high temperatures to melt the glass and form a robust seal during cooling. The glass medium 500 provides excellent sealing, preventing external moisture and oxygen from entering the vacuum chamber 600, while also preventing disruption of the vacuum environment inside the chamber. The glass medium 500 exhibits excellent chemical stability, resisting the erosion of various chemicals and making it suitable for a variety of corrosive environments. Glass itself is a good insulating material, providing reliable electrical insulation to ensure no electrical connection between the electrical connection terminal 400 and the second tube 200. The glass medium 500, formed through high-temperature sintering, possesses high mechanical strength and remains stable under high-temperature and high-pressure conditions.

[0045] In other embodiments, the electrical connection terminal 400 and the through hole 210 can also be sealed using other heat-resistant materials, such as ceramic materials or composite materials made of ceramics and fibers, which can maintain good sealing performance at high temperatures. During installation, these sealing materials are placed on the outer periphery of the electrical connection terminal 400. After the electrical connection terminal 400 is fixed to the second tube 200, the sealing material completely seals the through hole 210, ensuring a vacuum environment inside the vacuum chamber 600 and preventing external substances from entering the vacuum chamber 600.

[0046] In one embodiment, the electrical connection terminal 400 is welded to the thick film heating element 120.

[0047] Electrical connection 400 and thick-film heating element 120 are electrically connected via welding to ensure a reliable electrical connection and stability under high temperature and vibration conditions. Electrical connection 400 and thick-film heating element 120 can also be electrically connected via spot welding. A spot welding machine applies current to a specific location, generating localized heating that melts and fuses the metal contact surfaces of the electrical connection terminal 400 and thick-film heating element 120 together. Electrical connection 400 and thick-film heating element 120 can also be electrically connected via brazing. A filler metal (brazing filler metal) with a melting point lower than the base metal is used. Heated to a temperature below the melting point of the brazing filler metal, the filler metal melts and fills the gaps between the base metals, forming a strong connection. Commonly used brazing fillers include silver-based and copper-based fillers. Electrical connection 400 and thick-film heating element 120 can also be electrically connected via laser welding. A high-energy-density laser beam is used as a heat source to locally melt and fuse the metal.

[0048] In other embodiments, the electrical connection terminal 400 is configured as a flexible probe, with one end of the flexible probe passing through the through hole 210 and the other end elastically abutting against the thick film heating element 120.

[0049] In one implementation, please refer to Figure 2 and Figure 3 The first tube 110 includes a heating section 111 and two mounting sections 112 connected in its axial direction. The heating section 111 is located between the two mounting sections 112. The thick film heating element 120 is located in the heating section 111. The two opposite ends of the second tube 200 are connected to the outer peripheral wall of the mounting section 112.

[0050] A thick-film heating element 120 is installed in the heating section 111 and is responsible for generating heat. The heating section 111 typically requires a high-temperature resistant material to withstand the high-temperature environment during the heating process. The outer peripheral wall of the mounting section 112 is used to fix and connect the second tube 200 to achieve a stable connection between the first tube 110 and the second tube 200; the inner peripheral wall of the mounting section 112 is used to fix and connect the fluid transmission pipe 300 to achieve a stable connection between the first tube 110 and the fluid transmission pipe 300. The design of the mounting section 112 facilitates the operation of connecting the first tube 110 to the second tube 200 and the fluid transmission pipe 300, respectively.

[0051] In other embodiments, the second tube 200 has flanges at opposite ends, and the flanges are connected to the axial end faces of the first tube 110.

[0052] In one implementation, please refer to Figure 2 and Figure 3 The second tube body 200 includes, in its axial direction, a main body section 220 corresponding to the heating section 111, a connecting section 230 connecting the mounting section 112, and a transition section 240 disposed between the main body section 220 and the connecting section 230. The diameter of the connecting section 230 is smaller than the diameter of the main body section 220. The transition section 240 extends obliquely from the connecting section 230 toward the main body section 220 in the axial direction of the second tube body 200.

[0053] The main body section 220, transition section 240, and heating section 111 together enclose a closed space, forming a vacuum chamber 600. A through-hole 210 is provided in the main body section 220 for the power supply connection terminal 400 to pass through. The connecting section 230 is fixedly connected to the mounting section 112 by welding; the contact area between the connecting section 230 and the mounting section 112 is large, resulting in a more robust connection. The transition section 240 connects the main body section 220 and the connecting section 230 and is angled to achieve a smooth transition between them, reducing stress concentration points.

[0054] In other embodiments, the transition segment 240 may also be vertically connected to the main body segment 220 and the connecting segment 230.

[0055] In one implementation, please refer to Figure 2 and Figure 4 The fluid transmission pipe 300 and the inner peripheral wall of the heating section 111 enclose a transmission cavity 700, and are sealed to the inner peripheral walls of the two mounting sections 112.

[0056] By directly placing the fluid transfer pipe 300 inside the heating section 111, and with the outer peripheral wall of the fluid transfer pipe 300 and the inner peripheral wall of the heating section 111 enclosing a transfer cavity 700, the fluid directly contacts the heating section 111 of the first pipe body 110 through the transfer cavity 700. This reduces the resistance to heat conduction, allowing heat to be transferred to the fluid more quickly and evenly, thereby improving heat exchange efficiency. The sealed connection between the fluid transfer pipe 300 and the mounting section 112 ensures the airtightness of the transfer cavity, effectively preventing fluid leakage; at the same time, it also improves the stability and reliability of the connection between the fluid transfer pipe 300 and the first pipe body 110.

[0057] In other embodiments, the outer peripheral wall of the fluid transfer pipe 300 abuts against the inner peripheral wall of the heating section 111, and the fluid flows from the inside of the fluid transfer pipe 300. The heat from the thick film heating element 120 is transferred to the fluid sequentially through the first tube 110 and the wall of the fluid transfer pipe 300.

[0058] In one implementation, please refer to Figure 2 and Figure 4 The transmission cavity 700 is provided with a guide rib 310, which is connected to at least one of the inner peripheral wall of the heating section 111 and the outer peripheral wall of the fluid transmission pipe 300. The guide rib 310 extends spirally along the axial direction of the fluid transmission pipe 300.

[0059] The guide rib 310 extends spirally along the axial direction of the fluid transmission pipe 300, so that the transmission cavity 700 forms a spiral path extending along the axial direction of the fluid transmission pipe 300, so that the fluid flows along the spiral path, thereby increasing the contact time and area between the fluid and the heating section 111, and thus promoting more efficient heat exchange and significantly improving the heat exchange efficiency.

[0060] In other embodiments, the guide rib 310 extends axially along the fluid transmission pipe 300 and folds back and forth multiple times between the two ends of the fluid transmission pipe 300.

[0061] In one implementation, please refer to Figure 4 The guide rib 310 is formed on the outer peripheral wall of the fluid transmission pipe 300 and abuts against the inner peripheral wall of the heating section 111.

[0062] The guide rib 310 is directly formed on the fluid transmission pipe 300, making its processing more convenient. The guide rib 310 and the fluid transmission pipe 300 can be integrally molded, allowing the guide rib 310 to be directly machined during the manufacturing of the fluid transmission pipe 300. This not only simplifies the production process and reduces costs but also ensures higher precision and reliability. The guide rib 310 can abut against or be fixedly connected to the inner peripheral wall of the heating section 111, or it can have a gap with the inner peripheral wall of the heating section 111.

[0063] In other embodiments, the guide rib 310 may also be formed on the inner peripheral wall of the heating section 111; the guide rib 310 may also be independently processed and sleeved on the outer peripheral wall of the fluid transmission pipe 300 and abut against the inner peripheral wall of the heating section 111.

[0064] In one implementation, please refer to Figure 4 and Figure 5 The transmission cavity 700 has an interface 320 at both ends along its axial direction. The interface 320 is located on the inner circumferential wall of the fluid transmission pipe 300 and is equipped with a connecting pipe 330.

[0065] Interface 320 is located on the inner circumferential wall of fluid transfer pipe 300, allowing connecting pipe 330 to directly connect to transfer cavity 700 without additional adapters or complex connection structures. This simplifies installation and reduces the risk of leakage. Each interface 320 is equipped with connecting pipe 330 for connecting external equipment or pipelines to fluid transfer pipe 300. Fluid enters fluid transfer pipe 300 through connecting pipe 330 at one end, undergoes heat exchange within transfer cavity 700, and then exits through connecting pipe 330 at the other end. Connecting pipe 330 can be rigid or flexible.

[0066] In other embodiments, interface 320 may not have a connecting pipe 330, and an external pipe may be directly connected to interface 320.

[0067] In one embodiment, the first tube 110 and the second tube 200 are welded by vacuum furnace brazing.

[0068] The first tube body 110 and the second tube body 200 can be welded using vacuum furnace brazing. Vacuum furnace brazing is typically performed at a temperature above the melting point of the brazing filler metal but below the melting point of the base material. Vacuum furnace brazing is conducted in a vacuum environment, which avoids the influence of oxidation and other impurities during the welding process, while simultaneously achieving a vacuum environment inside the vacuum chamber 600. The vacuum furnace provides a uniform heating environment, ensuring uniform heating of the welding area; it effectively prevents oxidation, improving weld quality; and it allows for the simultaneous welding of multiple parts.

[0069] In another embodiment, the first tube 110 and the second tube 200 can also be welded by vacuum electron beam welding. Vacuum electron beam welding generates high temperatures by impacting the workpiece surface with a focused high-speed electron beam, melting the metal and forming a weld joint. Vacuum electron beam welding is also performed in a vacuum environment to avoid impurities in the atmosphere affecting the welding quality, while simultaneously achieving a vacuum environment inside the vacuum chamber 600. Electron beam welding can achieve very precise welding; it has high energy density, fast welding speed, and high efficiency.

[0070] The first tube 110 and the second tube 200 are fixedly connected by vacuum furnace brazing or vacuum electron beam welding. Since welding is carried out in a vacuum environment, a vacuum state can be achieved inside the vacuum chamber 600. At the same time, welding spatter is reduced during the welding process, and the quality of the welded surface is improved.

[0071] In one embodiment, the first tube 110 and the second tube 200 are made of stainless steel.

[0072] Stainless steel possesses excellent corrosion resistance, heat resistance, and mechanical strength. It can withstand high temperatures and is not easily deformed at high temperatures. The first tube 110 and the second tube 200 are both made of stainless steel, resulting in superior structural strength, corrosion resistance, and heat resistance. Furthermore, welding the two tubes together is more convenient and easier, eliminating the need for multiple welding operations using other adapters.

[0073] Furthermore, traditional heating structures use die-cast aluminum, which suffers from significant power attenuation in the heating resistance wire. Additionally, the heating effect of die-cast aluminum is concentrated only in the area containing the resistance wire, resulting in poor heating uniformity. In contrast, the heating device 10 proposed in this invention uses a thick-film heating tube 100, where the first tube body 110 and the second tube body 200 are directly welded from stainless steel. This not only results in more uniform heating but also simplifies the welding process.

[0074] In other embodiments, the first tube 110 and the second tube 200 may also be made of ceramic or other metal materials, such as aluminum and its alloys, copper and its alloys, molybdenum and molybdenum alloys, nickel-based alloys, titanium and its alloys, iron-based alloys, etc.

[0075] In one embodiment, the first tube body 110 is welded to the fluid transfer tube 300.

[0076] The first pipe body 110 and the fluid transmission pipe 300 are welded together to form a whole, which can improve the sealing performance between the first pipe body 110 and the fluid transmission pipe 300, ensure the sealing effect of the transmission cavity 700, and prevent fluid leakage; it can also increase the stability of the connection between the first pipe body 110 and the fluid transmission pipe 300, and prevent loosening or deformation caused by long-term use.

[0077] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A heating device, characterized in that, include: A thick-film heating tube includes a first tube body and a thick-film heating element; The second tube is sleeved around the outer periphery of the first tube and together with the first tube forms a vacuum cavity. The thick film heating element is disposed in the first tube and housed within the vacuum cavity. A fluid transfer tube is inserted into the first tube body and is used to transfer fluid.

2. The heating device as described in claim 1, characterized in that, The heating device further includes an electrical connection terminal. The second tube body is provided with a through hole. The electrical connection terminal passes through the through hole and is electrically connected to the thick film heating element. The electrical connection terminal is sealed to the through hole.

3. The heating device as described in claim 2, characterized in that, A glass medium is provided between the electrical connection terminal and the via, and the glass medium is sintered to seal the electrical connection terminal in the via. And / or, the electrical connection terminals are welded to the thick-film heating element.

4. The heating device as described in claim 1, characterized in that, The first tube body includes a heating section and two mounting sections connected in its axial direction. The heating section is located between the two mounting sections. The thick film heating element is located in the heating section. The two opposite ends of the second tube body are connected to the outer peripheral wall of the mounting section.

5. The heating device as described in claim 4, characterized in that, The second tube body includes, in its axial direction, a main body section corresponding to the heating section, a connecting section connecting the mounting section, and a transition section disposed between the main body section and the connecting section. The diameter of the connecting section is smaller than the diameter of the main body section, and the transition section extends obliquely from the connecting section toward the main body section in the axial direction of the second tube body.

6. The heating device as described in claim 4, characterized in that, The fluid transmission pipe and the inner peripheral wall of the heating section enclose a transmission cavity, and are sealed to the inner peripheral walls of the two mounting sections.

7. The heating device as described in claim 6, characterized in that, The transmission cavity is provided with guide ribs, which are connected to at least one of the inner peripheral wall of the heating section and the outer peripheral wall of the fluid transmission pipe. The guide ribs extend in a spiral shape along the axial direction of the fluid transmission pipe.

8. The heating device as described in claim 7, characterized in that, The guide ribs are formed on the outer peripheral wall of the fluid transmission pipe and abut against the inner peripheral wall of the heating section.

9. The heating device as described in claim 6, characterized in that, The transmission cavity is provided with interfaces at both ends along its axial direction. The interfaces are located on the inner circumferential wall of the fluid transmission pipe and are provided with connecting pipes.

10. The heating device as claimed in claim 1, characterized in that, The first tube body and the second tube body are welded by vacuum furnace brazing or vacuum electron beam welding. And / or, the first tube body and the second tube body are made of stainless steel; And / or, the first tube body is welded to the fluid transfer tube.

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