Thick film heating assembly and vehicle heater

Abstract

The utility model relates to the technical field of heating equipment, and particularly discloses a thick film heating assembly and a vehicle heater, the thick film heating assembly comprises a heating core body, the heating core body is provided with a first surface, a first side surface and a second side surface, the first side surface and the second side surface are connected to two sides of the first surface, and a plurality of runners are formed in the heating core body; the multiple flow channels are arranged at intervals in the first direction and penetrate through the first side face and the second side face, and every two adjacent flow channels are separated through a separation rib; the water inlet pipe is connected to the first side face and communicates with the multiple flow channels. The water outlet pipe is connected to the second side surface and is communicated with the plurality of flow channels; the heating film is arranged on the first surface, the heating film comprises a resistance layer, the resistance layer comprises a plurality of resistance strips, the resistance strips are sequentially arranged in the first direction, and the resistance strips correspond to the separation ribs respectively.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heating equipment, in particular to a thick film heating assembly and a vehicle heater. BACKGROUND

[0002] In recent years, thick film heating technology has received widespread attention due to its significant advantages in heat energy conversion and heating applications. This technology is based on the selection of specific rare earth thick film electrothermal materials, which realizes effective conversion from electrical energy to thermal energy through screen printing on various substrates. This technology is widely used in industrial heating, heat treatment, hot water supply and other fields due to its high efficiency, flexibility and wide applicability.

[0003] At present, when the thick film heating assembly using the thick film heating technology prints the thick film on the heating core, the thick film covers the entire surface of the heating core, which can cause dry burning in the heating core without flow channels during heating. Long-term use can cause damage to the thick film heating assembly, greatly shortening the service life of the thick film heating assembly. CONTENT OF THE INVENTION

[0004] The embodiments of the present application disclose a thick film heating assembly and a vehicle heater, which can avoid the damage of the thick film heating assembly caused by dry burning, and ensure the service life of the vehicle heater.

[0005] In order to achieve the above-mentioned purpose, in a first aspect, some embodiments of the present application provide a thick film heating assembly, comprising: a heating core, the heating core has a first surface, a first side and a second side, the first side and the second side are connected to the two sides of the first surface, a plurality of flow channels are formed in the heating core, the plurality of flow channels are arranged at intervals along a first direction, the flow channels penetrate the first side and the second side, and adjacent two flow channels are separated by a partition rib;

[0006] A water inlet pipe is connected to the first side and communicates with the plurality of flow channels;

[0007] A water outlet pipe is connected to the second side and communicates with the plurality of flow channels;

[0008] A heating film is arranged on the first surface, and the heating film comprises:

[0009] A resistance layer comprises a plurality of resistance strips, the plurality of resistance strips are arranged in sequence along the first direction, and each resistance strip is arranged corresponding to each partition rib.

[0010] Therefore, it is ensured that the position where the resistance strip is arranged is below the flow channel, which ensures that when the resistance strip dissipates heat, the heat can be transferred to the coolant or water in the flow channel through the flow channel for heat exchange. In this way, dry burning caused by the occurrence of an abnormally high temperature area on the heating core when the resistance strip generates heat can be avoided, and the service life and use safety of the thick film heating assembly are ensured.

[0011] In some embodiments of the present application, the width center of each resistance strip corresponds to the thickness center of each partition rib.

[0012] Therefore, by corresponding the width center of the resistance strip to the thickness center of the partition rib, when the resistance strip generates heat, the heat can be directly transferred to the partition rib through the resistance strip, and then heat the coolant or water in the flow channel, thereby improving the heat conduction efficiency. Moreover, this makes the heating effect around each flow channel more uniform, thereby avoiding the situation of local overheating or insufficient heating, which helps to ensure that the coolant or water in the flow channel maintains a uniform temperature during the heating process, thereby improving the uniformity and stability of heating.

[0013] In some embodiments of the present application, the length direction of the partition rib is perpendicular to the first direction, and the thickness of the partition rib along the first direction is smaller than the width of the resistance strip along the first direction.

[0014] Therefore, when the resistance strip generates heat, a part of the heat can be transferred from the first surface to the flow channel, and another part of the heat can be transferred from the partition rib to the flow channel, which ensures that the heat dissipated by the resistance strip can be uniformly transferred to the flow channel, thereby improving the heat conduction efficiency of the resistance strip and further improving the heating efficiency of the thick film heating assembly.

[0015] In some embodiments of the present application, the heating core further comprises two first plates arranged oppositely, and a plurality of partition ribs are connected between the two first plates, the partition ribs and the two first plates form the flow channel, and the ratio of the thickness of the partition rib to the thickness of the first plate is 0.8-1.

[0016] Therefore, the thickness of the partition rib can not only satisfy the supporting effect on the first plate, but also avoid the heat transfer path of the resistance strip to the partition rib being too long, thereby ensuring the efficient heat transfer of the partition rib and further ensuring the heat exchange efficiency of the heating core.

[0017] In some embodiments of the present application, the thickness of the first plate is 0.5-2.5 mm.

[0018] Therefore, it is ensured that the first plate has sufficient mechanical strength to withstand pressure or external force, and the heat dissipated by the resistance strip is transferred more efficiently through the first plate, thereby ensuring the heat exchange efficiency of the heating core.

[0019] In some embodiments of the present application, the heating core further comprises:

[0020] a second surface, the second surface being oppositely arranged with the first surface, and the first surface and the second surface are both provided with the heating film.

[0021] In this way, both the first surface and the second surface cover the heating film, which means that the heating area is significantly expanded. The larger heating area can more quickly transfer heat to the inside of the flow channel of the heating core, thereby improving the overall heating efficiency. Moreover, the double-sided heating design helps to ensure the temperature uniformity of the heating core during heating. When both surfaces are heated, heat can be more evenly distributed throughout the heating core, reducing the generation of temperature gradient. This not only improves the heating effect, but also prolongs the service life of the heating core, avoiding damage caused by local overheating.

[0022] In some embodiments of the present application, the distance between the first surface and the second surface is 5mm-20mm.

[0023] In this way, not only is the efficiency of heat transfer from the heating film to the inside of the heating core optimized, but also the heat released by the heating film can be more evenly distributed throughout the heating core, improving the heating effect.

[0024] In some embodiments of the present application, the heating core is a micro-channel flat tube.

[0025] In this way, because the micro-channel flat tube has an internal micro-channel structure, the heat exchange area is greatly increased, making heat transfer more rapid and efficient. Moreover, the micro-channel flat tube has a flat shape and a small flow channel size, which greatly reduces the space occupied by the entire thick film heating assembly. In the case of limited space in a car, this compact structure design helps to achieve a compact layout of the engine compartment, improve the space utilization of the entire vehicle, and reduce the weight of the entire vehicle, which is beneficial to the lightweight design of the car.

[0026] In some embodiments of the present application, the width of the flow channel along the first direction is 2mm-8mm.

[0027] In this way, it ensures that the liquid such as coolant or water flows stably and smoothly in the flow channel, reducing the resistance and pressure drop of the liquid flowing in the flow channel. Moreover, it can ensure the uniform distribution of the liquid during heat exchange, thereby improving the heat exchange efficiency and heat transfer performance.

[0028] In some embodiments of the present application, the inner wall of the flow channel is formed with a protruding structure.

[0029] Thus, the convex structure increases the surface area of the inner wall of the flow channel, thereby providing more heat exchange interface, which makes heat transfer more efficient and helps to improve the heat exchange performance of the thick-film heating assembly.

[0030] In some embodiments of the present application, the height of the convex structure protruding from the inner wall of the flow channel is 0.5mm-2mm.

[0031] Thus, it is ensured that the convex structure can effectively increase the contact area of the liquid with the inner wall of the flow channel in the flow channel, and effectively increase the turbulent flow of the liquid in the flow channel without hindering the flow of the liquid, so that the liquid is more uniformly distributed, which is conducive to improving the heat exchange efficiency of the heating core.

[0032] In some embodiments of the present application, the connection between the two adjacent inner walls of the flow channel has a recess.

[0033] Thus, the flow path of the liquid in the flow channel can be changed by the recess, so that the liquid generates vortex or turbulent flow when flowing through this area, thereby enhancing the mixing effect and heat exchange efficiency of the liquid, which helps to reduce the vacuum area of the liquid in the flow channel and improve the uniformity and stability of the liquid.

[0034] In some embodiments of the present application, the cross-sectional shape of the recess is arc-shaped.

[0035] Thus, the arc-shaped recess can more smoothly guide the flow of the liquid, increase the turbulent flow and vortex of the liquid at the recess, thereby reducing the vacuum area in the flow channel, ensuring sufficient contact of the liquid with the inner wall of the flow channel, and improving the heat exchange performance of the heating core.

[0036] In some embodiments of the present application, the convex structure is formed on the plurality of inner walls of the flow channel.

[0037] Thus, this further increases the contact area of the liquid in the flow channel with the inner wall of the flow channel, further increasing the heat exchange efficiency of the heating core.

[0038] In some embodiments of the present application, the material of the heating core includes metal aluminum.

[0039] Thus, metal aluminum has good thermal conductivity, which can quickly transfer heat to each part of the heating core, thereby improving the heating efficiency, which helps to ensure that the heating core reaches the required temperature in a short time and maintains stable heating effect. Moreover, aluminum is a lightweight metal with relatively low density, which makes the heating core lighter while maintaining high performance, facilitating installation.

[0040] In some embodiments of the present application, the heating core is integrally formed by an extrusion process.

[0041] Thus, the extrusion molding process can make the materials of the heating core more tightly bonded together, reducing the generation of internal defects and cracks, thereby improving the overall structural strength, which helps to resist external pressure and thermal stress, ensuring the stability and reliability of the heating core in long-term use. Moreover, the extrusion-molded heating core has a more uniform internal structure, which helps to evenly distribute and conduct heat, allowing the heating core to reach the required temperature faster and maintain stable heating effect, thereby improving heating efficiency and energy utilization. In addition, the one-piece molding process can reduce the multiple processing steps and assembly links in traditional manufacturing processes, thereby reducing manufacturing costs and time, reducing material waste and scrap rate, and improving production efficiency and resource utilization.

[0042] In some embodiments of the present application, the heating film further comprises:

[0043] an insulating layer disposed on the first surface, and the resistive layer is disposed on the insulating layer;

[0044] a conductor layer disposed on the resistive layer;

[0045] a protective layer disposed on the conductor layer.

[0046] Thus, the insulating layer is located between the resistive layer and the first surface of the heating core, which can effectively prevent the current from passing directly through the heating core, avoiding the risk of short circuit and electric shock. Through the conductive layer, the resistance of the heating film can be reduced, thereby reducing energy consumption and improving heating efficiency. The protective layer is located on the conductor layer, which can resist external physical impact and wear, protecting the heating film from damage.

[0047] In a second aspect, the embodiments of the present application provide a vehicle heater, comprising:

[0048] a housing, wherein a receiving cavity is formed in the housing;

[0049] The thick film heating assembly as described in the first aspect above is disposed in the receiving cavity, and the thick film heating assembly is used to heat the coolant.

[0050] Thus, the vehicle heater using the thick film heating assembly can prevent the thick film heating assembly from dry burning when heating the coolant, thereby ensuring the normal operation of the vehicle heater and ensuring the service life and safety of the vehicle heater.

[0051] Compared with the prior art, the beneficial effects of the present application are at least:

[0052] This application provides a thick-film heating assembly and an automotive heater. The thick-film heating assembly includes a heating core, an inlet pipe, an outlet pipe, and a heating film. The heating core has a first surface, a first side surface, and a second side surface. The first and second side surfaces are connected to both sides of the first surface. Multiple flow channels are formed within the heating core, spaced apart along a first direction and extending through the first and second side surfaces. Adjacent flow channels are separated by partition ribs. The inlet pipe is connected to the first side surface and communicates with the multiple flow channels. The outlet pipe is connected to the second side surface and communicates with the multiple flow channels. The heating film is disposed on the first surface and includes a resistance layer comprising multiple resistance strips arranged sequentially along the first direction, with each resistance strip corresponding to a partition rib. This arrangement of resistance strips corresponding to flow channels avoids the problem of dry burning during heating caused by placing resistance strips in areas without flow channels, preventing damage from abnormally high temperatures in the thick-film heating assembly, and thus ensuring the service life of the automotive heater. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the structure of the thick film heating assembly disclosed in the embodiments of this application;

[0055] Figure 2 This is an exploded view of the thick film heating assembly disclosed in the embodiments of this application;

[0056] Figure 3 This is a top view of the thick film heating assembly disclosed in an embodiment of this application;

[0057] Figure 4 for Figure 3 Sectional view of AA;

[0058] Figure 5 for Figure 4 A magnified view of a portion of point A in the middle.

[0059] Explanation of reference numerals in the attached figures:

[0060] 100-Thick film heating assembly;

[0061] 1-Heating core; 1a-First surface; 1b-First side surface; 1c-Second side surface; 1d-Second surface; 11-Flow channel; 111-Protruding structure; 112-Recessed portion; 12-Separating rib; 13-First plate;

[0062] 2 - water inlet pipe;

[0063] 3 - water outlet pipe;

[0064] 4 - heating film; 41 - resistance layer; 411 - resistance strip;

[0065] 5 - heating film pad;

[0066] X - first direction. DETAILED DESCRIPTION

[0067] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0068] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0069] In addition, in addition to being used to indicate the orientation or positional relationship, the above-mentioned partial terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. Those skilled in the art can understand the specific meaning of these terms in the present application according to the specific situation.

[0070] In addition, the terms "mount", "set", "provided with", "connected", "connected" should be broadly understood. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. Those skilled in the art can understand the specific meaning of the above terms in the present application according to the specific situation.

[0071] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific type and structure can be the same or different), and are not intended to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise stated, the meaning of "multiple" is two or more.

[0072] The vehicle heater, also known as the automobile coolant heater or the heater part of the water heating type heating system, is a component for heating coolant. The vehicle heater is usually located in the cooling system of the automobile engine, and heat exchange is carried out through the circulation of coolant, which not only helps to keep the engine running within the appropriate temperature range, but also can be used to provide warm air for the vehicle interior.

[0073] At present, thick film heating technology is applied to the heating assembly of the vehicle heater. The thick film heating technology refers to the technology of using rare earth thick film electrothermal material printed on various substrates (stainless steel, aluminum oxide, aluminum nitride, glass, ceramic, etc.) by screen printing process, and then conducting to generate heat, so as to realize the conversion from electric energy to heat energy. When the current passes through, the resistance material in the thick film will generate heat, and then heat the coolant.

[0074] In the related art, when printing the thick film on the substrate, the thick film covers the entire surface of the substrate, and the thick film is printed in the place where the flow channel is not arranged, so that when the thick film is electrified, the thick film in the place where the flow channel is not arranged will dry burn the substrate, which will cause the substrate to have an abnormally high temperature area or be damaged, which is not conducive to the normal use of the heating core, and will further cause the vehicle heater to be abnormal, threatening the life safety of the driver and passengers.

[0075] Based on this, the application discloses a thick film heating assembly and a vehicle heater, which can avoid the occurrence of dry burning, ensure the service life of the heating core, and further ensure the use safety of the vehicle heater.

[0076] The technical solutions will be further described below with reference to the embodiments and the drawings.

[0077] Please refer to Figure 1 and Figure 2 An embodiment of the application provides a thick film heating assembly 100, which comprises a heating core 1, and the heating core 1 has a first surface 1a, a first side surface 1b and a second side surface 1c, and the first side surface 1b and the second side surface 1c are connected to the two sides of the first surface 1a.

[0078] As shown in Figure 2 , a plurality of flow channels 11 are formed in the heating core 1, the plurality of flow channels 11 are arranged at intervals along a first direction X, the flow channels 11 penetrate through the first side surface 1b and the second side surface 1c, and adjacent two flow channels 11 are separated by a separation rib 12. The flow channels 11 in the heating core 1 are used for flowing liquid such as coolant or water.

[0079] As shown in Figure 2 , the thick film heating assembly 100 further comprises a water inlet pipe 2, and the water inlet pipe 2 is connected to the first side surface 1b and communicates with the plurality of flow channels 11. The water inlet pipe 2 communicates with the source of coolant or water provided by the outside, and the coolant or water is delivered into the flow channels 11 through the water inlet pipe 2.

[0080] As shown in Figure 2 , the thick-film heating assembly 100 further comprises a water outlet pipe 3 connected to the second side surface 1c and in communication with the plurality of flow channels 11. The water outlet pipe 3 is in communication with a heating system in a vehicle, and the heated coolant or water is delivered to the heating system through the water outlet pipe 3, and warm air is provided to the interior of the vehicle through the heating system.

[0081] As shown in Figure 1 and Figure 2 , the thick-film heating assembly 100 further comprises a heating film 4 arranged on the first surface 1a of the heating core 1. The heating film 4 can generate heat by being powered on, so as to transfer heat to the coolant or water in the flow channels 11 through the first surface 1a of the heating core 1.

[0082] The heating film 4 comprises a resistance layer 41, and the resistance layer 41 comprises a plurality of resistance strips 411 arranged along a first direction X, and each resistance strip 411 is arranged corresponding to each partition rib 12, wherein the first direction X is Figure 3 from left to right in the figure.

[0083] When the heating film 4 is powered on, the resistance strips 411 in the heating film 4 mainly generate heat to generate heat. Therefore, the arrangement position of the resistance strips 411 is closely related to the heat exchange efficiency of the thick-film heating assembly 100. When the resistance strips 411 are arranged on the surface of the position of the heating core 1 without the flow channels 11, the heat generated by the resistance strips 411 will cause heat to accumulate in the solid structure of the heating core 1 without the flow channels 11. The accumulation of heat emitted by the resistance strips 411 will cause the heating core 1 to have a locally abnormally high temperature area, which forms dry burning. Long-term dry burning will cause the heating core 1 to deform or be damaged, greatly increasing the safety hazard of the thick-film heating assembly 100.

[0084] Therefore, in the embodiment of the present application, each resistance strip 411 is arranged corresponding to each partition rib 12. Since the partition rib 12 is located between the adjacent two flow channels 11, it is ensured that the position where the resistance strip 411 is arranged is below the flow channel 11, which ensures that when the resistance strip 411 emits heat, the heat can be transferred to the coolant or water in the flow channel 11 through the flow channel 11 for heat exchange. In this way, dry burning caused by the abnormal high temperature area on the heating core 1 when the resistance strip 411 generates heat can be avoided, and the service life and safety of the thick-film heating assembly 100 are ensured.

[0085] In some embodiments, the heating film 4 further comprises an insulating layer, which is arranged on the first surface la, and the resistive layer 41 is arranged on the insulating layer. Since the insulating layer is located between the resistive layer 41 and the first surface la of the heating core 1, it effectively prevents the current from passing directly through the heating core 1, avoiding the risk of short circuit and electric shock. Moreover, the insulating layer can reduce the influence of environmental factors on the resistive layer 41, thereby improving the stability and service life of the heating film 4.

[0086] The heating film 4 further comprises a conductor layer arranged on the resistive layer. The conductor layer has good electrical conductivity, and through the conductor layer, the resistance of the heating film 4 can be reduced, thereby reducing energy consumption and improving heating efficiency. Moreover, the design of the conductor layer can ensure that the current is evenly distributed on the heating film 4, avoiding local overheating and current concentration, thereby improving the uniformity and stability of heating.

[0087] The heating film 4 further comprises a protective layer arranged on the conductor layer. Since the protective layer is located on the conductor layer, it can resist external physical impact and wear, protecting the heating film 4 from damage. Moreover, the protective layer has waterproof and moisture-proof functions, which can prevent moisture and other liquids from entering the inside of the heating film 4, ensuring the normal operation of the heating film 4.

[0088] It should be noted that, as shown in Figure 3 The thick film heating assembly 100 further comprises a heating film pad 5, which is arranged on the first surface la of the heating core 1, and the heating film pad 5 is used to connect an external power supply to the conductor layer in the heating film 4.

[0089] For example, when the heating film pad 5 supplies power to the conductor layer, the conductor layer supplies power to the resistive layer 41, and the resistive layer 41 generates heat after being powered on. The heat emitted by the resistive strips 411 in the resistive layer 41 is transferred to the flow channel 11 and exchanges heat with the coolant or water in the flow channel 11, to complete the heating of the coolant or water.

[0090] In some embodiments, in combination with Figure 2 and Figure 5 The width center of each resistive strip 411 corresponds to the thickness center of each partition rib 12, respectively.

[0091] It should be noted that the width center of the resistive strip 411 refers to the center of the width of the resistive strip 411 along the first direction X, and similarly, the thickness center of the partition rib 12 refers to the center of the thickness of the partition rib 12 along the first direction X.

[0092] The width center of the resistance strip 411 corresponds to the thickness center of the partition rib 12, and when the resistance strip 411 generates heat, the heat can be directly transmitted to the partition rib 12 through the resistance strip 411, and then the coolant or water in the flow channel 11 is heated, which improves the heat conduction efficiency. Moreover, this makes the heating effect around each flow channel 11 more uniform, thereby avoiding the situation of local overheating or insufficient heating, which helps to ensure that the coolant or water in the flow channel 11 maintains a uniform temperature during heating, and improves the uniformity and stability of heating.

[0093] In some embodiments, the length direction of the partition rib 12 is perpendicular to the first direction X, and the thickness P of the partition rib 12 along the first direction X is smaller than the width of the resistance strip 411 along the first direction X. That is to say, one resistance strip 411 partially covers the flow channels on both sides of one partition rib 12 in the first direction X.

[0094] In this way, when the resistance strip 411 generates heat, part of the heat can be transmitted from the first surface 1a to the flow channel 11, and another part of the heat can be transmitted from the partition rib 12 to the flow channel 11, which ensures that the heat emitted by the resistance strip 411 can be uniformly transmitted to the flow channel 11, improves the heat conduction efficiency of the resistance strip 411, and further improves the heating efficiency of the thick film heating assembly 100.

[0095] In some embodiments, the heating core 1 further comprises two first plate bodies 13 arranged oppositely, and a plurality of partition ribs 12 are connected between the two first plate bodies 13, and the partition ribs 12 and the two first plate bodies 13 form the flow channel 11, and the ratio of the thickness P of the partition rib 12 to the thickness N of the first plate body 13 is 0.8-1.

[0096] When the ratio of the thickness P of the partition rib 12 to the thickness N of the first plate body 13 is less than 0.8, it means that the thickness P of the partition rib 12 is much smaller than the thickness N of the first plate body 13, which weakens the supporting effect of the partition rib 12 on the first plate body 13, and the first plate body 13 may be easily deformed or damaged when bearing a large pressure or temperature change.

[0097] When the ratio of the thickness P of the partition rib 12 to the thickness N of the first plate body 13 is greater than 1, it means that the thickness P of the partition rib 12 is greater than the thickness N of the first plate body 13, which ensures that the partition rib 12 has sufficient support for the first plate body 13, but the heat transfer path of the resistance strip 411 to the flow channel 11 through the partition rib 12 is lengthened, which reduces the heat transfer efficiency of the partition rib 12, and further reduces the heat transfer efficiency of the heating core 1.

[0098] Therefore, in the embodiment of the present application, the ratio of the thickness P of the partition rib 12 to the thickness N of the first plate body is 0.8-1, so that the thickness P of the partition rib 12 can meet the supporting effect on the first plate body 13, and the heat transfer path of the electric resistance strip 411 to the partition rib 12 is not too long, which ensures the efficient heat transfer of the partition rib 12, and further ensures the heat exchange efficiency of the heating core 1.

[0099] In some embodiments, the thickness N of the first plate body 13 is 0.5-2.5 mm.

[0100] When the thickness N of the first plate body 13 is less than 0.5 mm, the mechanical strength of the first plate body 13 will be significantly reduced, and the first plate body 13 is prone to deformation or damage when subjected to pressure or external force, which further causes the heating core 1 to be unable to be normally used.

[0101] When the thickness N of the first plate body 13 is greater than 2.5 mm, although the mechanical strength of the first plate body 13 is sufficient, the excessive thickness of the first plate body 13 will cause the heat transfer path of the heat emitted by the electric resistance strip 411 in the first plate body 13 to increase, which causes the heat to be unable to be timely transferred to the coolant or water in the flow channel 11 to exchange heat, and the heat exchange efficiency of the heating core 1 is reduced.

[0102] Therefore, in the embodiment, the thickness N of the first plate body 13 is 0.5-2.5 mm, which not only ensures that the first plate body 13 has sufficient mechanical strength to withstand pressure or external force, but also ensures that the heat emitted by the electric resistance strip 411 has a higher transfer efficiency through the first plate body 13, and further ensures the heat exchange efficiency of the heating core 1.

[0103] For example, when the thickness N of the first plate body 13 is 1 mm, correspondingly, the thickness P of the partition rib 12 is 0.8-1 mm, which can ensure that the heat of the heating film 4 can be timely transferred to the liquid in the flow channel 11 through the first plate body 13 to exchange heat, and the heat exchange efficiency is improved; when the thickness N of the first plate body 13 is 2 mm, correspondingly, the thickness P of the partition rib 12 is 1.6-2 mm, which can ensure that the first plate body 13 has sufficient mechanical strength, so that the structure of the first plate body 13 will not be damaged under long-term use, and the service life of the heating core 1 is ensured.

[0104] In some embodiments, as shown in FIG. 1, Figure 4 the heating core 1 further comprises a second surface 1d opposite to the first surface 1a, and the first surface 1a and the second surface 1d are both provided with the heating film 4.

[0105] Since both the first surface 1a and the second surface 1d are covered with heating films 4, it means that the heating area is significantly enlarged. A larger heating area can deliver heat to the flow channel 11 inside the heating core 1 more quickly, thus improving the overall heating efficiency. Moreover, the design of double-sided heating helps to ensure the temperature uniformity of the heating core 1 during heating. When both surfaces are heated, heat can be more evenly distributed throughout the heating core 1, reducing the generation of temperature gradients. This not only improves the heating effect, but also prolongs the service life of the heating core 1, avoiding damage caused by local overheating.

[0106] It should be noted that the heating film 4 provided on the second surface 1d is the same as the heating film 4 provided on the first surface 1a, wherein the resistance strips 411 are all provided corresponding to the positions of the partition ribs 12, and the width center of the resistance strips 411 corresponds to the thickness center of the partition ribs 12.

[0107] In some embodiments, the spacing M between the first surface 1a and the second surface 1d is 5mm-20mm.

[0108] When the spacing M between the first surface 1a and the second surface 1d of the heating core 1 is less than 5mm, it means that the thickness of the heating core 1 is too thin. When the heating film 4 works on both sides at the same time, a significant temperature gradient will be generated inside the heating core 1. If the spacing is too small, due to the difference in the thermal expansion coefficient of the material, it may cause a sharp increase in thermal stress, which can cause the structure of the heating core 1 to deform, crack, and even affect its overall performance and reliability.

[0109] When the spacing M between the first surface 1a and the second surface 1d of the heating core 1 is greater than 20mm, it means that the thickness of the heating core 1 is too thick. As the spacing increases, the efficiency of heat transfer from the heating film 4 to the inside of the heating core 1 will decrease. This is because a part of the heat will be lost to the air during the transfer process, especially in the case of a larger spacing, more heat will be lost. This will result in a decrease in the overall heating efficiency of the heating core 1, and it will take longer to reach the required temperature.

[0110] Moreover, the increase in spacing can lead to an increase in the non-uniformity of temperature distribution inside the heating core 1. Due to the longer heat transfer path, there can be a large temperature difference between different positions inside the heating core 1. This not only affects the heating effect, but also causes unnecessary thermal stress on the material of the heating core 1, thus affecting its service life.

[0111] In addition, a larger spacing means that the overall size of the heating core 1 will increase, thus occupying more space, which is not conducive to arranging in the compact space inside the car.

[0112] Therefore, the distance M between the first surface 1a and the second surface 1d in the embodiment is 5mm-20mm, which not only optimizes the efficiency of heat transfer from the heating film 4 to the inside of the heating core 1, but also makes the heat released by the heating film 4 more evenly distributed in the entire heating core 1, improving the heating effect.

[0113] Exemplarily, when the distance M between the first surface 1a and the second surface 1d is 5mm, the heat transfer efficiency of the heating film 4 into the flow channel 11 is improved; when the distance M between the first surface 1a and the second surface 1d is 20mm, it ensures that there is no significant temperature gradient in the heating core 1 when the heating film 4 is heated, ensuring the service life of the heating core 1.

[0114] In some embodiments, the heating core 1 is a micro-channel flat tube. Because the micro-channel flat tube has an internal micro-channel structure, it greatly increases the heat exchange area, making heat transfer more rapid and efficient. Moreover, the micro-channel flat tube can complete heat exchange in a shorter time, thereby improving the heating efficiency. In addition, the micro-channel flat tube has a flat shape and a small size of the flow channel 11, which greatly reduces the space occupied by the entire thick film heating assembly 100. In the limited space of a car, this compact structure design helps to realize the compact layout of the engine compartment, improve the space utilization of the vehicle, and reduce the weight of the vehicle, which is beneficial to the lightweight design of the vehicle.

[0115] In some embodiments, the width Q of the flow channel 11 along the first direction X is 2mm-8mm.

[0116] When the width Q of the flow channel 11 along the first direction X is less than 2mm, it means that the width of the flow channel 11 is too narrow, which makes the coolant or water and other liquids flowing in the flow channel 11 receive greater friction and resistance, resulting in increased resistance of the coolant or water and other liquids flowing in the flow channel 11, further increasing energy loss and pressure drop, thereby affecting the flow speed and efficiency. Moreover, if the width of the flow channel 11 is too narrow, the residence time of the coolant or water and other liquids in the flow channel 11 will be shortened, thereby reducing their contact time and area with the wall surface of the flow channel 11, resulting in reduced heat exchange efficiency.

[0117] When the width Q of the flow channel 11 along the first direction X is greater than 8mm, it means that the width of the flow channel 11 is too wide, which will result in uneven distribution of the coolant or water in the flow channel 11. When the coolant or water and other liquids enter the wider flow channel 11, their flow speed will decrease, resulting in increased residence time of the liquids in the flow channel 11, so that part of the heat emitted by the heating film 4 cannot be transferred to the liquids in the flow channel 11, thereby affecting the heat exchange efficiency, making the liquid temperature in some areas higher and the liquid temperature in other areas lower.

[0118] Therefore, in this embodiment, the width Q of the flow channel 11 along the first direction X is 2mm to 8mm, which ensures stable and smooth flow of liquids such as coolant or water within the flow channel 11, reducing the resistance and pressure drop of the liquid flow within the flow channel 11. Furthermore, it ensures uniform distribution of the liquid during the heat exchange process, thereby improving heat exchange efficiency and heat transfer performance.

[0119] For example, when the width Q of the flow channel 11 along the first direction X is 4 mm, the pressure loss and flow velocity of the liquid in the flow channel 11 are nearly balanced. This allows the liquid to maintain a high flow velocity with a small pressure loss, thereby increasing the liquid flow rate per unit area in the flow channel 11 and improving the heat exchange efficiency of the thick film heating component 100. When the width Q of the flow channel 11 along the first direction X is 2 mm, the liquid flows at a high velocity in the flow channel 11, which improves the heat exchange efficiency of the heating core 1. When the width Q of the flow channel 11 along the first direction X is 8 mm, the friction and resistance experienced by the liquid in the flow channel 11 are small, which reduces the energy loss and pressure drop of the liquid during the flow process, increases the contact time between the liquid and the inner wall of the flow channel 11, and improves the heat exchange efficiency.

[0120] In some embodiments, such as Figure 4 and Figure 5 As shown, the inner wall of the flow channel 11 has a raised structure 111. The raised structure 111 can disrupt the laminar flow of the liquid within the flow channel 11, promoting turbulence. Turbulence helps increase the heat transfer efficiency between the liquid and the inner wall of the flow channel 11. Furthermore, the raised structure 111 increases the surface area of ​​the inner wall of the flow channel 11, thereby providing more heat exchange interfaces, which makes heat transfer more efficient and helps improve the heat exchange performance of the thick film heating assembly 100. In addition, the raised structure 111 can promote the mixing of the liquid within the flow channel 11, making the liquid at different temperatures more uniformly distributed. This helps reduce the temperature gradient within the flow channel 11 and improves the overall thermal uniformity of the thick film heating assembly 100.

[0121] In some embodiments, the height H of the protrusion structure 111 protruding from the inner wall of the flow channel 11 is 0.5 mm to 2 mm.

[0122] When the height H of the protrusion 111 protruding from the inner wall of the flow channel 11 is less than 0.5 mm, the liquid flow within the flow channel 11 may more easily remain in a laminar state, resulting in relatively low heat transfer efficiency. Furthermore, the small height of the protrusion 111 cannot adequately promote liquid mixing within the flow channel 11, leading to a temperature gradient within the flow channel 11 and affecting the overall performance of the thick-film heating assembly 100. In addition, insufficient height of the protrusion 111 reduces the contact area between the liquid and the protrusion 111. This increases thermal resistance, making heat transfer more difficult.

[0123] When the height H of the protrusion 111 protruding from the inner wall of the flow channel 11 is greater than 2 mm, the excessively high protrusion 111 may cause more resistance to the liquid during flow. This resistance increases energy loss and reduces the overall efficiency of the thick-film heating assembly 100. Although the protrusion 111 itself can increase the heat exchange area, when its height is too large, it may partially obstruct or hinder the liquid flow, resulting in a reduction in the actual effective heat exchange area. Due to the reduced heat exchange area and the non-uniformity of the liquid flow, the heat transfer efficiency may decrease, which will affect the heat exchange performance of the thick-film heating assembly 100, causing it to fail to achieve the expected heating effect.

[0124] Therefore, in this embodiment, the height H of the protrusion structure 111 protruding from the inner wall of the flow channel 11 is 0.5mm to 2mm, which ensures that the protrusion structure 111 can effectively increase the contact area between the liquid and the inner wall of the flow channel 11, and that the protrusion structure 111 can effectively increase the turbulence of the liquid in the flow channel 11 without hindering the liquid flow, so that the liquid distribution is more uniform and it is beneficial to improve the heat exchange efficiency of the heating core 1.

[0125] For example, when the height H of the protrusion 111 protruding from the inner wall of the flow channel 11 is 1.25 mm, the protrusion 111 will not obstruct the flow of liquid in the flow channel 11, ensuring smooth flow of liquid. Furthermore, the protrusion 111 can effectively increase the contact area between the liquid and the inner wall of the flow channel 11, thereby improving heat exchange efficiency. When the height H of the protrusion 111 protruding from the inner wall of the flow channel 11 is 0.5 mm, it can prevent the excessively high protrusion 111 from obstructing or blocking the flow of liquid in the flow channel 11, ensuring the effective heat exchange area between the liquid and the inner wall of the flow channel 11, thereby improving heat exchange efficiency. When the height H of the protrusion 111 protruding from the inner wall of the flow channel 11 is 2 mm, it can sufficiently increase the contact area between the liquid and the inner wall of the flow channel 11, fully promoting the mixing of liquid in the flow channel 11, thereby improving heat exchange efficiency.

[0126] In some embodiments, such as Figure 5 As shown, the connection between two adjacent inner walls of the flow channel 11 has a recess 112. When the liquid flows in the flow channel 11, a vacuum zone is formed in the space at the four apex corners of the flow channel 11. Since no liquid flows through the vacuum zone, the contact between the inner wall of the flow channel 11 and the liquid is insufficient, which reduces the heat exchange efficiency of the heating core 1.

[0127] Therefore, the recess 112 can change the flow path of the liquid in the flow channel 11, so that the liquid generates eddies or turbulence when flowing through the area, thereby enhancing the mixing effect and heat exchange efficiency of the liquid. This helps to reduce the vacuum area of ​​the liquid in the flow channel 11 and improve the uniformity and stability of the liquid.

[0128] In some embodiments, as shown in FIG. 1, the flow channel 11 is formed by a plurality of inner walls. The plurality of inner walls of the flow channel 11 are arranged in a staggered manner, which can increase the contact area between the liquid and the inner walls of the flow channel 11, thereby increasing the heat exchange efficiency of the heating core 1. Figure 5 In some embodiments, as shown in FIG. 1, the cross-sectional shape of the recess 112 is arc-shaped. The arc-shaped recess 112 can guide the liquid flow more smoothly, increase the turbulence and vortex of the liquid at the recess 112, thereby reducing the vacuum area in the flow channel 11, ensuring sufficient contact between the liquid and the inner walls of the flow channel 11, and improving the heat exchange performance of the heating core 1. In addition, the arc-shaped recess 112 can more evenly distribute stress and reduce the risk of structural damage due to stress concentration.

[0129] In some embodiments, as shown in FIG. 1, the plurality of inner walls of the flow channel 11 are formed with protruding structures 111, which further increases the contact area between the liquid in the flow channel 11 and the inner walls of the flow channel 11, further increasing the heat exchange efficiency of the heating core 1. Figure 5

[0130] It should be noted that the shape of the protruding structure 111 can be "V" shaped, and can also be other protruding shapes, such as a "V" shape with a rounded transition. The present embodiment does not make specific limitations on this.

[0131] In some embodiments, the material of the heating core 1 includes aluminum. Since aluminum has good thermal conductivity, it can quickly transfer heat to various parts of the heating core 1, thereby improving the heating efficiency, which helps to ensure that the heating core 1 reaches the required temperature in a short time and maintains stable heating effect. Moreover, aluminum is a lightweight metal with relatively low density, which allows the heating core 1 to maintain high performance while reducing overall weight, facilitating installation and transportation. At the same time, the strength of aluminum is also high enough to withstand certain mechanical stress and thermal stress, ensuring the long-term use reliability of the heating core 1.

[0132] In some embodiments, the heating core 1 is integrally formed by an extrusion process. The extrusion forming process is a forming method that makes the material plastically deform in the mold to obtain a product with the required shape and size. It often involves placing a metal blank in the mold cavity, and by applying a strong pressure, forcing the metal blank to extrude from the die hole of the mold, forming a product with a specific shape and size.

[0133] ​The extrusion molding process can make the materials of the heating core 1 more tightly bonded together, reducing the generation of internal defects and cracks, thereby improving the overall structural strength, which helps to resist external pressure and thermal stress, ensuring the stability and reliability of the heating core 1 in long-term use. Moreover, the extrusion-molded heating core 1 has a more uniform internal structure, which helps to evenly distribute and conduct heat, allowing the heating core 1 to reach the required temperature faster and maintain stable heating effect, thereby improving heating efficiency and energy utilization. In addition, the one-piece extrusion molding process can reduce the multiple processing steps and assembly links in traditional manufacturing processes, thereby reducing manufacturing costs and time, reducing material waste and scrap rate, and improving production efficiency and resource utilization.

[0134] The second aspect of the present application discloses a vehicle heater, which comprises a shell, and a containing cavity is formed in the shell for containing other components of the vehicle heater.

[0135] The vehicle heater further comprises the thick-film heating assembly 100 of the first aspect, and the thick-film heating assembly 100 is arranged in the containing cavity of the shell and is used for heating the coolant.

[0136] The vehicle heater with the thick-film heating assembly 100 can prevent the thick-film heating assembly 100 from dry burning when heating the coolant, thereby ensuring the normal operation of the vehicle heater and the service life and safety of the vehicle heater.

[0137] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A thick film heating assembly, characterized by, The application relates to a thick-film heating assembly. The thick-film heating assembly comprises a heating core, a water inlet pipe, a water outlet pipe and a heating film. The heating core has a first surface, a first side and a second side, the first side and the second side are connected to two sides of the first surface, a plurality of flow channels are formed in the heating core, the flow channels are arranged in a first direction, the flow channels penetrate the first side and the second side, and two adjacent flow channels are separated by a partition rib. The water inlet pipe is connected to the first side and communicates with the flow channels. The water outlet pipe is connected to the second side and communicates with the flow channels. The heating film is arranged on the first surface, and the heating film comprises an electric resistance layer.

2. The thick film heating assembly of claim 1, wherein, The electric resistance layer comprises a plurality of electric resistance strips, the electric resistance strips are arranged in the first direction, and each electric resistance strip is arranged corresponding to each partition rib.

3. The thick film heating assembly of claim 2, wherein, The width center of each electric resistance strip corresponds to the thickness center of each partition rib.

4. The thick film heating assembly of claim 3, wherein, The length direction of the partition rib is perpendicular to the first direction, the thickness of the partition rib in the first direction is smaller than the width of the electric resistance strip in the first direction.

5. The thick film heating assembly of claim 4, wherein, The heating core further comprises two first plates arranged oppositely, the partition ribs are connected between the two first plates, the partition ribs and the two first plates form the flow channels, and the ratio of the thickness of the partition rib to the thickness of the first plate is 0.8-1.

6. The thick film heating assembly of claim 1, wherein, The thickness of the first plate is 0.5-2.5 mm. The heating core further comprises a second surface arranged oppositely to the first surface, and the first surface and the second surface are both provided with the heating film.

7. The thick film heating assembly of claim 6, wherein, The distance between the first surface and the second surface is 5-20 mm.

8. The thick film heating assembly of claim 1, wherein, The heating core is a micro-channel flat tube.

9. The thick film heating assembly of claim 8, wherein, The width of the flow channel in the first direction is 2-8 mm.

10. The thick film heating assembly of claim 1, wherein, The inner wall of the flow channel is provided with a convex structure.

11. The thick film heating assembly of claim 10, wherein, The height of the convex structure protruding from the inner wall of the flow channel is 0.5-2 mm.

12. The thick film heating assembly of claim 10, wherein, The connection between two adjacent inner walls of the flow channel has a recess.

13. The thick film heating assembly of claim 12, wherein, The cross-sectional shape of the recess is arc-shaped.

14. The thick film heating assembly of claim 10, wherein, The convex structure is formed on the plurality of inner walls of the flow channel.

15. The thick film heating assembly of claim 1, wherein, The material of the heating core comprises metal aluminum.

16. The thick film heating assembly of claim 1, wherein, The heating core is integrally formed through an extrusion process.

17. The thick film heating assembly of any of claims 1-16, wherein, The heating film further comprises an insulation layer, a conductor layer and a protective layer. The insulation layer is arranged on the first surface, the electric resistance layer is arranged on the insulation layer, the conductor layer is arranged on the electric resistance layer, and the protective layer is arranged on the conductor layer. The application further relates to a water heater. The water heater comprises a shell, a thick-film heating assembly and a water tank.

18. A vehicle heater, characterized by comprising: The thick-film heating assembly is arranged in the accommodating cavity of the shell and is used for heating a coolant. ​ ​

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