An insulating and instant-heating multi-layer composite thick film heating element

Abstract

The present invention discloses an insulating and instant-heating multi-layer composite thick film heating element, which relates to the field of electrothermal devices. Through the shunt of the heat-conducting medium and the utilization of temperature difference, combined with the dynamic confluence design in the low-pressure and low-speed region, the present solution realizes the rapid temperature homogenization of the inner and outer layers of the heat-conducting medium, effectively improving the heating efficiency. Moreover, combined with the negative pressure effect to form a closed heating of the internal circulating gas, it can make full use of the heat on both sides of the thick film patch, eliminate the problem of heat accumulation, and further improve the energy utilization rate. The combination of the dynamic flow field and aeration significantly enhances the fluidity of the heat-conducting medium, greatly optimizing the uniformity of heat distribution, enabling efficient and uniform heating to be achieved within an extremely short heating path of the heat-conducting medium, and meeting the requirements of instant heating.

Description

Technical Field

[0001] The present invention relates to the field of electrothermal devices, and particularly to an insulating and instant-heating multi-layer composite thick film heating element. Background Art

[0002] As a currently widely used heating method, thick film heating films adopt the principle of resistance heating. Its basic working principle is that when an electric current flows through a conductive material, a resistance heating effect is generated. When an electric current passes through the conductive material, due to the existence of resistance, the conductive material will be heated and generate heat, realizing instant heat start-up when powered on;

[0003] In the traditional method, the thick film heating element is attached to the surface of a metal pipe to heat the heat-conducting medium inside the pipe. Although when the length of the pipe body increases, the total area of the attachment area expands, which may contribute to heat transfer, the quality of the heating effect is actually jointly affected by various factors such as the power density of the heating element, the heat conduction efficiency, and the flow rate of the heat-conducting medium. Simply relying on increasing the attachment area to improve the heating effect is not necessarily efficient.

[0004] When the length of the pipe body is limited, the attachment area is limited, and the heating capacity may be insufficient. To make up for this defect, increasing the working temperature of the heating element can, to a certain extent, increase heat transfer. However, in the case of a relatively large inner diameter of the pipe and an increase in the internal flow rate, the heat is mainly concentrated in the outer layer of the medium, and the inner layer is not directly heated. It needs to rely on subsequent flow processes to gradually achieve temperature uniformity through convective heat transfer and conduction. This process has relatively high requirements for the flow rate and flow characteristics (such as laminar or turbulent states) of the heat-conducting medium. The heat transfer effect is more significant under a faster flow rate or turbulent state, but simply improving the fluidity (such as reducing viscosity) is not sufficient to significantly improve the uniformity effect.

[0005] In addition, this method relies on a certain length of the pipe body to complete the uniform distribution of temperature. Therefore, it is difficult to achieve sufficient heating of the heat-conducting medium in a relatively short pipe section, and it cannot meet the instant heating requirement. Under the length limitation in a limited space, it is easy to cause the heat-conducting medium to be exported before being uniformly heated. Moreover, most of the existing thick film heating elements are designed with unilateral attachment, and the other side is usually covered with heat insulation materials, resulting in heat accumulation and low utilization rate. Summary of the Invention

[0006] The purpose of the present invention is to propose an insulating and instant-heating multi-layer composite thick film heating element to solve the problem that the current thick film heating element cannot achieve rapid and uniform heating of the heat-conducting medium in a relatively large-diameter pipe within a limited length.

[0007] To achieve the above object, the present invention adopts the following technical solution: An insulating instant-heating multi-layer composite thick film heating element, comprising a connecting tee and a transition cylinder sleeved therein, a thick film patch attached to the surface of the connecting tee for heating, an insulating sleeve attached to the surface of the thick film patch and fixed to the connecting tee, and a core seat installed on the inner wall of the connecting tee under the action of the transition cylinder;

[0008] Wherein: The connecting tee is used to be heated inside during the transportation of the heat-conducting medium, and includes a tee pipe and an annular groove opened on its side wall, and a plurality of first mating ports are opened on the inner wall of the annular groove;

[0009] The insulating sleeve is used for protecting the outer side wall of the thick film patch and introducing circulating gas for cooling, and includes a sleeve body and a spiral flow channel arranged spirally therein;

[0010] The core seat is used for heat conduction inside the connecting tee and diverting part of the heat-conducting medium to flow back after heating, and guiding the circulating gas heated in the insulating sleeve to mix with the heat-conducting medium. It includes a core body and a plurality of shunt holes and return holes opened on its side wall for shunting and heating, and a plurality of air exposure holes for uniformly discharging the circulating gas heated up are opened on the inner wall of the core body;

[0011] The transition cylinder is used for axially sealing and fitting the core seat on the inner wall of the tee pipe, and includes a shunt channel communicating with the shunt holes and the return holes.

[0012] As a further description of the above technical solution: It further includes a gas collecting hood sealed and installed at the top of the tee pipe, a gas guide pipe is connected to the top of the gas collecting hood, and the other end of the gas guide pipe is connected to one end of the spiral flow channel in the sleeve body.

[0013] As a further description of the above technical solution: The connecting tee further includes a pin seat fixed inside the tee pipe and used for installing the transition cylinder, and a thick film attachment groove for positioning and attaching the thick film patch is opened on the outer side wall of the tee pipe.

[0014] As a further description of the above technical solution: The transition cylinder includes a cylinder body and a plurality of pin holes opened on its surface, and the pin holes are slidably positioned in cooperation with the pin seat.

[0015] As a further description of the above technical solution: The core seat further includes a plurality of positioning convex seats arranged at the bottom of the core body and cooperating with the pin holes. Second mating ports communicating with the inside of the core body are opened on the surface of the positioning convex seats, and the second mating ports are communicated with the corresponding first mating ports.

[0016] As a further description of the above technical solution: The annular groove is connected to one end of the spiral flow channel, and the sleeve body seals and maintains the surface of the annular groove.

[0017] As a further description of the above technical solution: The thick film patch is sequentially provided with a resistance layer, a first composite layer, a current intercepting layer, and a second composite layer from outside to inside. The first composite layer is located between the resistance layer and the current intercepting layer for increasing strength and insulating separation. The second composite layer is bonded to the inner wall of the thick film slot.

[0018] Two ear tabs are provided on one side of the resistance layer, and a grounding tab is provided on one side of the current intercepting layer.

[0019] As a further description of the above technical solution: The isolation sleeve further includes a window opening formed in the side wall of the sleeve body, and both the two ear tabs and the grounding tab are located within the window opening.

[0020] As a further description of the above technical solution: Both ends of the core body are in a horn shape, and the horn-shaped area at the bottom end of the core body is a high-pressure low-speed area, its top end is a low-pressure low-speed area, and the middle part is a medium-pressure high-speed area.

[0021] The air exposure holes are formed in the medium-pressure high-speed area, the flow dividing holes are formed in the high-pressure low-speed area, and the return holes are formed in the low-pressure low-speed area.

[0022] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0023] In this solution, the heat-conducting medium is divided into two parts through the flow dividing holes at the bottom of the core body. One part forms a first heat-receiving body and flows and heats inside the core body, and the other part forms a second heat-receiving body, which directly contacts and is heated by the inner wall of the three-way pipe in the diversion groove, so that its temperature is higher than that of the first heat-receiving body. Subsequently, the first heat-receiving body converges in the low-pressure low-speed area and impacts the second heat-receiving body in a decelerated state in multiple directions and mixes. Through this dynamic flow field design, rapid and uniform heating of the inner and outer layers of the heat-conducting medium is achieved.

[0024] After the gas enters the spiral flow channel and the annular groove through the air guide pipe in the air collecting cover, it makes full contact with the thick film patch, and the heat on both sides is utilized, avoiding heat accumulation and greatly improving the heat efficiency. The gas inside the core body is aerated and then re-circulated internally. This method combines bubble mixing heating with the improvement of the fluidity of the heat-conducting medium. Combined with the special flow field design in the low-pressure low-speed area, the bubbles are evenly distributed in the heat-conducting medium and the fluidity is promoted. At the same time, combined with the aeration effect of the internally circulated gas, the heat exchange efficiency of the heat-conducting medium is improved, and an efficient and energy-saving heating effect is achieved.

[0025] In the above method, through the diversion of the heat-conducting medium and the utilization of the temperature difference, combined with the dynamic confluence design in the low-pressure and low-speed area, the rapid homogenization of the temperature of the inner and outer layers of the heat-conducting medium is achieved, effectively improving the heating efficiency. And through the negative pressure effect, the closed heating of the inner-circulation gas is formed, which not only avoids the leakage of heat, but also makes full use of the heat on both sides of the thick-film patch, eliminates the problem of heat accumulation, and further improves the energy utilization rate. The combination of the dynamic flow field and aeration significantly enhances the fluidity of the heat-conducting medium, greatly optimizing the uniformity of the heat distribution, enabling efficient uniform heating to be achieved within the extremely short heating path of the heat-conducting medium, and meeting the requirements of instant heating. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the explosion diagram of the present invention;

[0027] Figure 2 is the three-dimensional diagram of the present invention;

[0028] Figure 3 is the three-dimensional diagram of the present invention from another perspective;

[0029] Figure 4 is the three-dimensional sectional view of the present invention;

[0030] Figure 5 For the present invention Figure 4 is the enlarged diagram of the partial area A in the present invention;

[0031] Figure 6 is the partial sectional view of the present invention;

[0032] Figure 7 is the partial sectional view of the present invention from another perspective;

[0033] Figure 8 is the three-dimensional sectional view of the mating state of the transition cylinder and the core seat of the present invention;

[0034] Figure 9 is the three-dimensional sectional view of the connecting tee of the present invention;

[0035] Figure 10 is the three-dimensional diagram of the isolation sleeve of the present invention;

[0036] Figure 11 is the three-dimensional diagram of the transition cylinder of the present invention;

[0037] Figure 12 is the three-dimensional sectional view of the core seat of the present invention;

[0038] Figure 13 is the three-dimensional diagram of the core seat of the present invention;

[0039] Figure 14 is the explosion diagram of the thick-film patch of the present invention;

[0040] Figure 15 is a more detailed explosion schematic diagram of the present invention;

[0041] Figure 16 is a schematic diagram of the flow principle of the present invention.

[0042] Legend description:

[0043] 10. Connecting tee; 11. Tee pipe; 12. Thick film attachment groove; 13. Annular groove; 14. First pair of interfaces; 15. Pin seat;

[0044] 20. Gas collecting hood;

[0045] 30. Thick film patch; 31. Resistance layer; 32. Current intercepting layer; 33. First composite layer; 34. Second composite layer; 35. Tab; 36. Grounding tab;

[0046] 40. Isolation sleeve; 41. Sleeve body; 42. Spiral flow channel; 43. Window opening;

[0047] 50. Transition cylinder; 51. Cylinder body; 52. Shunt channel; 53. Pin hole;

[0048] 60. Core seat; 61. Core body; 62. Positioning boss; 63. Second pair of interfaces; 64. Shunt hole; 65. Return hole; 66. Aeration hole;

[0049] 70. Air duct. Specific embodiments

[0050] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0051] As Figure 1 - Figure 16 shown, the present invention provides: a non-electric instantaneous heating multi-layer composite thick film heating element, including a connecting tee 10 and a transition cylinder 50 sleeved therein, a thick film patch 30 attached to the surface of the connecting tee 10 for heating, an isolation sleeve 40 attached to the surface of the thick film patch 30 and fixed to the connecting tee 10, and a core seat 60 installed on the inner wall of the connecting tee 10 under the action of the transition cylinder 50;

[0052] Among them: the connecting tee 10 is used to be heated inside during the transportation of the heat-conducting medium, including a tee pipe 11 and an annular groove 13 opened on its side wall, and a plurality of first pair of interfaces 14 are opened on the inner wall of the annular groove 13;

[0053] The isolation sleeve 40 is used for protecting the outer wall of the thick film patch 30 and introducing circulating gas for cooling, and includes a sleeve body 41 and a spiral flow channel 42 arranged spirally therein;

[0054] The core seat 60 is used for connecting the heat conduction in the tee 10 and diverting part of the heat-conducting medium to flow back after heating, and guiding the circulating gas in the isolation sleeve 40 after heating to be mixed with the heat-conducting medium. It includes a core body 61 and a plurality of diversion holes 64 and return holes 65 opened on its side wall for diverting and heating. A plurality of air holes 66 for uniformly discharging the circulating gas after heating are opened on the inner wall of the core body 61;

[0055] The transition cylinder 50 is used for axially sealing and fitting the core seat 60 on the inner wall of the tee pipe 11, and includes a diversion channel 52 communicated with the diversion holes 64 and the return holes 65.

[0056] The diversion holes 64 and the return holes 65 are located at both ends of the diversion channel 52, and a channel for diverting the heat-conducting medium is formed as a whole. And this position is directly attached to the tee pipe 11, making its heat receiving effect better. Combining with the heat of the cylinder body 51, the heating rate can be further accelerated.

[0057] Specifically, as Figure 3 and Figure 4 shown: It further includes a gas collecting hood 20 sealed and installed at the top end of the tee pipe 11. A gas guide pipe 70 is communicated with the top of the gas collecting hood 20, and the other end of the gas guide pipe 70 is connected to one end of the spiral flow channel 42 in the sleeve body 41.

[0058] By setting the gas collecting hood 20, the gas collecting hood 20 can provide a reserved space. After the water flow enters this space, it cannot flow out, and the air is converged under the action of gravity. After the air is converged, it flows back through the gas guide pipe 70 to realize the circulating flow of the air and avoid heat leakage.

[0059] Specifically, as Figure 9 shown: The connecting tee 10 further includes a pin seat 15 fixed in the tee pipe 11 and used for installing the transition cylinder 50. A thick film patch groove 12 for positioning and attaching the thick film patch 30 is opened on the outer side wall of the tee pipe 11.

[0060] By setting the pin seat 15, the pin seat 15 can keep the core body 61 and the cylinder body 51 in a constant axial position, and the thick film patch groove 12 on the surface can keep the thick film patch 30 in a fixed heating position, so that the positions of its heating position and the heat receiving position to be heated can both be accurately positioned to maintain the best temperature transfer and heating;

[0061] Installation process:

[0062] The connecting tee 10 serves as the support for the overall structure. The core seat 60 is snapped into the inner wall of the transition cylinder 50 (keeping the positioning slot sliding into the pin hole 53), and then the transition cylinder 50 is fitted to the inner wall of the tee pipe 11 (the pin hole 53 is snapped into the pin seat 15). Finally, the air vent holes 66 are installed at the top of the tee pipe 11, and the gas collecting hood 20 is fixed and then connected to the air guide pipe 70;

[0063] Before the above assembly, the thick film patch 30 is attached to the thick film slot 12 on the surface of the tee pipe 11, and then the isolation sleeve 40 is covered (during the covering process of the isolation sleeve 40, it is necessary to keep the window 43 aligned with the pole ear 35 and the grounding ear 36). As can be seen above, the structure of this device is simple, easy to install, and has excellent performance.

[0064] Specifically, as Figure 11 and Figure 2 shown: The transition cylinder 50 includes a cylinder body 51 and a number of pin holes 53 opened on its surface. The pin holes 53 cooperate with the pin seats 15 for sliding positioning.

[0065] The pin holes 53 and the pin seats 15 are positioned and slide, which can fix the cylinder body 51, and the cylinder body 51 can simultaneously fix the core body 61 through the positioning convex seat 62.

[0066] Specifically, as Figure 8 shown: The core seat 60 further includes a number of positioning convex seats 62 provided at the bottom of the core body 61 and cooperating with the pin holes 53. The surface of the positioning convex seat 62 is provided with second mating interfaces 63 communicating with the inside of the core body 61. The second mating interfaces 63 communicate with the corresponding first mating interfaces 14.

[0067] The positioning convex seats 62 can slide in the pin holes 53. When the pin holes 53 are positioned with the pin seats 15, the pin holes 53 can simultaneously position the positioning convex seats 62. While realizing the installation, the shunt holes 64, the return holes 65 and the shunt channels 52 can be kept connected and calibrated, and the second mating interfaces 63 and the first mating interfaces 14 are also docked and connected.

[0068] Specifically, as Figure 5 shown: The annular groove 13 is connected to one end of the spiral flow channel 42, and the sleeve body 41 seals and maintains the surface of the annular groove 13.

[0069] The annular groove 13 can evenly disperse the heated gas in the spiral flow channel 42, so that after dispersion, it can enter the core body 61 through the first mating interfaces 14 and the second mating interfaces 63.

[0070] Specifically, as Figure 14As shown: The thick film patch 30 is successively provided with a resistance layer 31, a first composite layer 33, a current intercepting layer 32, and a second composite layer 34 from outside to inside. The first composite layer 33 is located between the resistance layer 31 and the current intercepting layer 32 for increasing strength and insulating separation. The second composite layer 34 is bonded to the inner wall of the thick film slot 12. The first composite layer 33 and the second composite layer 34 include an insulating layer, a strengthening layer, and an adhesive layer.

[0071] Two ear tabs 35 are provided on one side of the resistance layer 31, and a grounding ear 36 is provided on one side of the current intercepting layer 32.

[0072] The thick film patch 30 can generate heat when powered on through the resistance layer 31, and the heat is transferred to the thick film slot 12 of the three-way pipe 11 through the first composite layer 33, the current intercepting layer 32, and the second composite layer 34. During this process, the first composite layer 33 and the second composite layer 34 maintain insulation and connection with each other, avoiding the occurrence of contact conduction.

[0073] Currently, when the temperature of the resistance layer 31 of the thick film patch 30 reaches above 450 degrees Celsius, the leakage current will increase sharply. In this solution, the first composite layer 33 and the second composite layer 34 are insulated and cooperated, and a mesh-shaped current intercepting layer 32 is provided between them. If the leakage current increases sharply, the leakage current contacts the current intercepting layer 32 after passing through the first composite layer 33, and the leakage current is led out through the grounding ear 36, avoiding continuing to pass through the second composite layer 34, so that the overall stability is achieved and the leakage current is prevented from being conducted to the heat conducting medium, aiming to solve the risk of electric leakage and completely eliminate the potential safety hazard of the leakage current.

[0074] Specifically, as Figure 10 shown: The isolation sleeve 40 further includes a window 43 opened on the side wall of the sleeve body 41. Both ear tabs 35 and the grounding ear 36 are located within the window 43.

[0075] By providing the window 43, the window 43 can keep the ear tabs 35 and the grounding ear 36 of the thick film patch 30 exposed during use, facilitating subsequent wiring and soldering.

[0076] Specifically, as Figure 7 shown: Both ends of the core body 61 are trumpet-shaped, and the trumpet-shaped area at the bottom end of the core body 61 is a high-pressure and low-speed area, its top end is a low-pressure and low-speed area, and the middle part is a medium-pressure and high-speed area.

[0077] Through the trumpet-shaped settings at both ends of the core body 61, a good flow effect of converging and diffusing the heat conducting medium can be achieved.

[0078] Specifically, as Figure 9 and Figure 16As shown: The air vent holes 66 are opened in the medium-pressure high-speed area, the shunt holes 64 are opened in the high-pressure low-speed area, and the return holes 65 are opened in the low-pressure low-speed area.

[0079] The air vent holes 66 are arranged in the medium-pressure high-speed area, enabling the high-speed flowing heat-conducting medium to form a siphon at the position of the air vent holes 66, so as to realize the cooperation of aeration and guide the internal air flow to achieve internal circulation.

[0080] At the same time, the setting of the high-pressure low-speed area can form a high-pressure area at the position of the shunt holes 64, enabling a large amount of pressure to pass through the middle of the core body 61 under the action of pressure, and part of the pressure is relieved through the shunt holes 64, and the heat-conducting medium in the shunt holes 64 has sufficient kinetic energy to flow in the shunt channel 52 and has the kinetic energy to spray out in one direction after being heated.

[0081] Through the setting of the low-pressure low-speed area, a pressure difference is formed with the high-pressure low-speed area, enabling the heat-conducting medium to flow directionally. At the same time, the space of the low-pressure low-speed area is relatively large, which can decelerate the accelerated heat-conducting medium, making the temperature uniformity more sufficient.

[0082] When this solution is in use, the heat-conducting medium flows upward in the tee 11. When the heat-conducting medium flows to the high-pressure low-speed area at the bottom of the core body 61, the high-pressure heat-conducting medium accelerates when passing through the core body 61, and part of the heat-conducting medium enters the shunt channel 52 of the cylinder body 51 through the shunt holes 64 at the bottom of the core body 61. The heat is transferred from the tee 11 and the cylinder body 51 to the core body 61, and the heat-conducting medium flowing in the core body 61 is heated as the first heated body. Part of the heat-conducting medium flows to the return holes 65 through the shunt channel 52. During this process, the shunted heat-conducting medium directly contacts the inner wall of the tee 11 in the diversion groove, so that only the tee 11 is used for heat transfer between it and the thick film patch 30, making its temperature higher than that of the heat-conducting medium in the core body 61 as the second heated body, and flowing into the low-pressure low-speed area at the top of the core body 61 in an inclined state under the guiding action of the return holes 65. At this time, the space of the high-speed flowing first heated body becomes larger in the low-pressure low-speed area, causing the flow rate to slow down, and the obliquely flowing second heated body directly convects and impacts the first heated body from multiple directions, making the temperature of the higher-temperature second heated body uniform with that of the first heated body, so as to achieve better uniform heating within an extremely limited length.

[0083] Meanwhile, based on the action of the high-speed heat-conducting medium in the core body 61, the high-temperature gas in the internal cavity of the core body 61 is extracted, forming uniform bubbles that are mixed with the first heated body and further heating the first heated body. After being heated, the bubbles float up in large numbers under the action of buoyancy and converge into the gas collecting hood 20 at a low flow rate in the low-pressure and low-speed area. At this time, a negative pressure appears in the cavity of the core body 61, and the gas in the gas collecting hood 20 enters one end of the spiral flow channel 42 in the sleeve body 41 through the air duct 70 under the action of the negative pressure. When flowing in the spiral flow channel 42, it fully contacts the outer side of the thick film patch 30, causing the air to be heated and enter the annular groove 13, and then enter the cavity in the core body 61 through a number of first mating interfaces 14 and second mating interfaces 63 in the annular groove 13, and continue to aerate therewith, forming an internal circulation of the heating gas. This method can improve the fluidity of the heat-conducting medium through the aeration method, and the closed heating air flow in the internal circulation can make full use of the heat on the other side of the thick film patch 30, avoiding heat accumulation on this side;

[0084] In summary, in this solution, after the heat-conducting medium is shunted, a temperature difference is formed and the flow rate is decelerated in the low-pressure and low-speed area for confluence. Under the impact of the confluence, they are fully mixed, realizing the rapid uniformization of the temperature of the outer layer and the inner layer of the heat-conducting medium. Combined with the cooperation of the internal circulating gas, while avoiding heat leakage, the heat on the other side of the thick film patch 30 is fully utilized. After the air flow is mixed with the first heated body, heating is realized, and the flow rate and fluidity are enhanced.

[0085] In this solution, through the shunt design of the heat-conducting medium, a temperature difference is formed between the first heated body and the second heated body. The flow rate is decelerated and multi-directional impact confluence is realized in the low-pressure and low-speed area, so that the two are fully mixed, thereby realizing the rapid uniform heating of the inner and outer layers of the heat-conducting medium within a limited length. Secondly, through the negative pressure design of the internal cavity of the core body 61, using the internal circulation of the high-temperature gas, the aeration and heating processes are combined to further enhance the fluidity of the heat-conducting medium. At the same time, the heat on the other side of the thick film patch 30 is fully utilized through the spiral flow channel 42 and the annular groove 13 structures, avoiding heat accumulation and improving the heat utilization efficiency.

[0086] Moreover, the mixed heating of the bubbles and the heat-conducting medium not only optimizes the heat transfer, but also promotes the fluidity and the uniformity of the heat distribution in the low-speed area, ensuring that the entire heating process is efficient, closed and without heat leakage. While ensuring the heating uniformity, this solution makes full use of the heat energy and improves the fluidity of the heat-conducting medium, having the remarkable advantages of high efficiency, energy saving and rapid heating.

[0087] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. A power-off instant-heating multi-layer composite thick film heating element, characterized in that, It includes a connecting tee (10), a thick film patch (30) and an isolation sleeve (40) provided on the surface of the tee (10), and a transition cylinder (50) sleeved inside the connecting tee (10), and further includes a core seat (60) positioned and sleeved inside the connecting tee (10) by the transition cylinder (50); The connecting tee (10) includes a tee pipe (11) for conveying a heat-conducting medium and heated inside it, and an annular groove (13) opened on the side wall of the tee pipe (11), and a plurality of first mating ports (14) are opened on the inner wall of the annular groove (13); The isolation sleeve (40) includes a sleeve body (41) attached to the outside of the thick film patch (30), and a spiral flow channel (42) for guiding the flow of gas and heated outside the thick film patch (30) is opened inside the sleeve body (41); The core seat (60) includes a core body (61) and a plurality of shunt holes (64) and return holes (65) opened on its side wall, and a plurality of vent holes (66) for discharging the gas after temperature rise are opened on the inner wall of the core body (61). The core seat (60) is used for heat conduction inside the connecting tee (10) and at the same time shunts part of the heat-conducting medium to flow back after heating, and is also used for guiding the gas to mix with the heat-conducting medium inside the connecting tee (10); The transition cylinder (50) is used for axially sealing and attaching the core seat (60) to the inner wall of the tee pipe (11), and the transition cylinder (50) includes a shunt channel (52) corresponding to and communicating with the shunt holes (64) and the return holes (65); 2. The electro-insulating instant heating multi-layer composite thick film heating element according to claim 1, wherein A gas collecting hood (20) is sealed and installed at the top of the tee pipe (11), a gas guide pipe (70) is connected to the top of the gas collecting hood (20), and the other end of the gas guide pipe (70) is connected to one end of the spiral flow channel (42) inside the sleeve body (41); 3. The electro-insulating instant heating multi-layer composite thick film heating element according to claim 1, wherein The connecting tee (10) further includes a pin seat (15) fixed inside the tee pipe (11) and used for installing the transition cylinder (50), and a thick film attachment groove (12) for positioning and attaching the thick film patch (30) is opened on the outer side wall of the tee pipe (11); 4. The absolute-insulation instant-heating multi-layer composite thick film heating element according to claim 3, characterized in that, The transition cylinder (50) includes a cylinder body (51) and a plurality of pin holes (53) opened on its surface, and the pin holes (53) cooperate with the pin seat (15) for sliding positioning; 5. The absolute-electricity instant-heating multi-layer composite thick-film heating element according to claim 1, wherein, The core seat (60) further includes a plurality of positioning convex seats (62) arranged at the bottom of the core body (61) and cooperating with the pin holes (53). A second mating port (63) communicating with the inside of the core body (61) is opened on the surface of the positioning convex seat (62), and the second mating port (63) is connected to the corresponding first mating port (14); 6. The absolute-electricity instant-heating multi-layer composite thick film heating element according to claim 5, wherein The annular groove (13) is connected to one end of the spiral flow channel (42), and the sleeve body (41) seals and holds the surface of the annular groove (13); 7. The absolute-insulation instant-heating multi-layer composite thick-film heating element according to claim 3, wherein, The thick film patch (30) is sequentially provided with a resistance layer (31), a first composite layer (33), a current-cutting layer (32) and a second composite layer (34) from outside to inside. The first composite layer (33) is located between the resistance layer (31) and the current-cutting layer (32) for increasing strength and insulating separation, and the second composite layer (34) is bonded to the inner wall of the thick film attachment groove (12); Two tab ears (35) are provided on one side of the resistance layer (31), and a grounding ear (36) is provided on one side of the current intercepting layer (32).

8. The insulating and instantaneously heating multi-layer composite thick film heating element according to claim 7, characterized in that, The isolation sleeve (40) further includes a window opening (43) formed in the side wall of the sleeve body (41), and the two tab ears (35) and the grounding ear (36) are both located within the window opening (43).

9. A kind of power-off instant-heating multi-layer composite thick film heating element according to claim 5, characterized in that, Both ends of the core body (61) are in a horn shape, and the horn-shaped area at the bottom end of the core body (61) is a high-voltage and low-speed area, its top end is a low-voltage and low-speed area, and the middle part is a medium-voltage and high-speed area.

10. A kind of electricity-isolating instant-heating multi-layer composite thick film heating element according to claim 9, characterized in that, The air exposure holes (66) are formed in the medium-voltage and high-speed area, the flow splitting holes (64) are formed in the high-voltage and low-speed area, and the return holes (65) are formed in the low-voltage and low-speed area.

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