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 runners are arranged at intervals in the first direction and penetrate through the first side face and the second side face; the heating film is arranged on the first surface; the water inlet pipe is connected to the first side face and communicates with the multiple flow channels, and a water inlet cavity is formed in the water inlet pipe; the water outlet pipe is connected to the second side face and communicates with the multiple flow channels. The minimum sectional area of the water inlet cavity in the radial direction is larger than the maximum sectional area of each flow channel in the first direction.

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. Based on the selection of specific rare earth thick film electrothermal materials, this technology 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, after the water inlet pipe of the thick film heating assembly is welded with the heating core body, the flow of water from the water inlet pipe into the flow channel of the heating core body is uneven, and part of the flow channel in the heating core body has no water passing through, resulting in a decrease in the heat exchange efficiency 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 uneven distribution of liquid in the flow channel of the heating core body, ensure that liquid passes through each flow channel of the heating core body, and improve the heat exchange efficiency of the heating core body.

[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:

[0006] a heating core body, the heating core body 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 body, the plurality of flow channels are arranged at intervals along a first direction, and the flow channels penetrate through the first side and the second side;

[0007] a heating film, the heating film is arranged on the first surface;

[0008] a water inlet pipe, the water inlet pipe is connected to the first side and communicates with the plurality of flow channels, and a water inlet cavity is formed in the water inlet pipe;

[0009] a water outlet pipe, the water outlet pipe is connected to the second side and communicates with the plurality of flow channels;

[0010] The minimum cross-sectional area of the water inlet cavity in the radial direction is greater than the maximum cross-sectional area of each flow channel in the first direction.

[0011] Therefore, the liquid can enter each flow channel uniformly after entering the water inlet cavity from the water inlet pipe, and the liquid flow in the flow channel is more uniform. Moreover, when the liquid enters the flow channel from the water inlet cavity of the water inlet pipe, the flow resistance of the liquid in the flow channel is reduced due to the smaller cross-sectional area of the flow channel than that of the water inlet cavity, thereby ensuring the uniform flow of the liquid in the flow channel, improving the heating efficiency of the heating core, and further improving the heat exchange efficiency of the thick film heating assembly.

[0012] In some embodiments of the present application, the inner diameter of the water inlet pipe is equal along the axial direction of the water inlet pipe.

[0013] The cross-sectional area of the flow channel is equal along the extension direction of the flow channel.

[0014] Therefore, the pressure loss of the liquid in the water inlet cavity and the flow channel is avoided, and the flow pressure of the liquid is ensured, thereby ensuring the heating efficiency of the heating system.

[0015] In some embodiments of the present application, the ratio of the cross-sectional area of the water inlet cavity along the radial direction to the cross-sectional area of one flow channel along the first direction is 10-30.

[0016] Therefore, the flow uniformity of the liquid in the flow channel is ensured, and the liquid can more uniformly absorb heat energy when entering the flow channel and flowing through the heating film, thereby improving the heating efficiency of the heating core and enabling the size of the thick film heating assembly to meet the compact layout in the vehicle.

[0017] In some embodiments of the present application, the ratio of the cross-sectional area of the water inlet cavity along the radial direction to the cross-sectional area of one flow channel along the first direction is 15-20.

[0018] Therefore, the water inlet cavity can better balance the distribution of the liquid, ensuring that each flow channel can obtain relatively uniform fluid flow, which helps to reduce the decrease in heating efficiency and the increase in energy consumption caused by uneven distribution of the liquid. Moreover, this further reduces the resistance of the liquid when flowing into and out of the flow channel, which helps to improve the fluid dynamics performance of the thick film heating assembly, reduces energy consumption, and improves overall efficiency. In addition, within this ratio range, the liquid flow in the flow channel is more uniform, thereby improving the heating uniformity of the heating film to the fluid and improving the heating efficiency of the heating core.

[0019] In some embodiments of the present application, the extension direction of the flow channel is perpendicular to the axial direction of the water inlet pipe.

[0020] Therefore, the liquid can be better diverted and distributed when entering the flow channel, and since the liquid flows into the water inlet pipe at a certain speed, the vertical flow channel can ensure that the liquid reduces the formation of vortex and turbulence when turning, thereby reducing pressure loss, which also helps the liquid to form a more uniform and stable flow state in the flow channel, improving heating efficiency.

[0021] In some embodiments of the present application, the water inlet pipe is provided with an opening on one side of the heating core, and the width of the opening in the direction perpendicular to the first surface is greater than the thickness of the heating core. The heating core further comprises:

[0022] A connecting piece is used to connect the opening and the end of the heating core close to the first side.

[0023] Therefore, the connecting piece can realize stable connection between the heating core and the opening of the water inlet pipe.

[0024] In some embodiments of the present application, the connecting piece is in sealing connection with the opening, and the connecting piece is provided with a through hole penetrating through the connecting piece in the extension direction of the flow channel. The end of the heating core close to the first side extends into the through hole and is fixedly connected with the through hole.

[0025] Therefore, the sealing connection between the connecting piece and the opening of the water inlet pipe avoids leakage of the liquid during the process of flowing from the water inlet pipe to the flow channel. The end of the heating core close to the first side extending into the through hole of the connecting piece ensures that the liquid can smoothly flow from the water inlet cavity of the water inlet pipe into the flow channel of the heating core, ensuring the heating efficiency of the heating core.

[0026] In some embodiments of the present application, the opening close to the edge of the heating core has a groove, and the connecting piece has a flange. The flange extends into the groove and abuts with the groove bottom in the extension direction of the flow channel.

[0027] Therefore, through the groove and the flange, on the one hand, the contact area between the connecting piece and the opening can be increased, thereby improving the stability of the connection. On the other hand, the flange extends into the groove and abuts with the groove bottom, forming an effective sealing barrier, which can reduce the risk of leakage of the liquid when flowing from the water inlet cavity into the flow channel, ensuring smooth flow of the liquid. In addition, the groove and the flange make it easier to align and position the connecting piece during installation, reducing the difficulty of installation, improving the efficiency of installation, and also reducing the connection problems caused by improper installation.

[0028] In some embodiments of the present application, the inner wall of the through hole has a stop portion, and the end of the heating core close to the first side has a stop surface. The stop portion abuts with the stop surface in the extension direction of the flow channel.

[0029] Thus, the accurate positioning of the heating core in the through hole is ensured, the movement of the heating core in the extension direction of the flow channel is prevented, stable fixation is achieved, and accurate alignment between the flow channel and the opening is ensured. Moreover, the abutment of the stop portion and the stop surface increases the contact area between the heating core and the connecting piece, thereby improving the connection strength, helping to prevent loosening of the connection due to vibration or liquid pressure, and enhancing the overall stability between the heating core and the connecting piece.

[0030] In some embodiments of the present application, the end surface of the heating core is flush with the surface of the connecting piece facing the water inlet cavity.

[0031] Thus, uniform distribution and smooth flow of the liquid in the water inlet cavity can be ensured, thereby ensuring that the liquid has sufficient flow pressure when entering the flow channel, thereby improving the heating efficiency of the heating core.

[0032] In some embodiments of the present application, the water inlet pipe and the heating core are connected to the connecting piece by a laser welding process.

[0033] Thus, the connection between the water inlet pipe, the heating core and the connecting piece can be ensured to be firm and reliable. Moreover, the weld formed by laser welding has high strength and sealing performance, can withstand a large pressure, and effectively prevents liquid leakage. In addition, the laser welding process can reduce thermal deformation and residual stress during welding, thereby improving the mechanical properties and fatigue resistance of the welded joint, which makes the thick film heating assembly more stable and reliable during use, prolonging its service life.

[0034] In some embodiments of the present application, the heating core further comprises:

[0035] A second surface is arranged opposite to the first surface, and the first surface and the second surface are both provided with the heating film.

[0036] Thus, the first surface and the second surface both cover the heating film, meaning that the heating area is significantly expanded. A 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 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 gradients. This not only improves the heating effect, but also prolongs the service life of the heating core, avoiding damage due to local overheating.

[0037] In some embodiments of the present application, the heating core is integrally formed by an extrusion process.

[0038] 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 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.

[0039] In some embodiments of the present application, the material of the heating core is metal aluminum.

[0040] Thus, metal aluminum has good thermal conductivity, which can quickly transfer heat to all parts of the heating core, thereby improving 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 allows the heating core to reduce overall weight while maintaining high performance, facilitating installation.

[0041] In a second aspect, the embodiments of the present application provide a vehicle heater, comprising:

[0042] a housing, wherein an accommodating cavity is formed in the housing; and

[0043] The thick-film heating assembly as described in the first aspect above is arranged in the accommodating cavity, and the thick-film heating assembly is used to heat the coolant.

[0044] Thus, the vehicle heater using the thick-film heating assembly can achieve efficient heating of the coolant, ensuring that the coolant reaches the required temperature in a short time, thereby improving the heating efficiency.

[0045] Compared with the prior art, the present application has at least the following beneficial effects:

[0046] The thick film heating assembly and the vehicle heater provided by the embodiment of the present application comprise a heating core, a heating film, a water inlet pipe and a water outlet pipe. 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 pass through the first side and the second side. The heating film is arranged on the first surface. The water inlet pipe is connected to the first side and communicates with the plurality of flow channels. A water inlet cavity is formed in the water inlet pipe. The water outlet pipe is connected to the second side and communicates with the plurality of flow channels. The minimum cross-sectional area of the water inlet cavity along a radial direction is greater than the maximum cross-sectional area of each flow channel along the first direction. In this way, the liquid can enter each flow channel when entering the flow channels from the water inlet pipe, avoiding the situation that some flow channels have no liquid, ensuring the uniformity of the liquid flow between the water inlet pipe and the flow channels, and improving the heat exchange efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0048] Figure 1 A structural schematic diagram of the thick film heating assembly disclosed by the embodiment of the present application;

[0049] Figure 2 A structural schematic diagram of the thick film heating assembly (omitting the heating film) disclosed by the embodiment of the present application;

[0050] Figure 3 An exploded view of the thick film heating assembly (omitting the heating film) disclosed by the embodiment of the present application;

[0051] Figure 4 A front view of the thick film heating assembly disclosed by the embodiment of the present application;

[0052] Figure 5 A top view of the thick film heating assembly disclosed by the embodiment of the present application;

[0053] Figure 6 A Figure 5 A sectional view of B-B;

[0054] Figure 7 A connection schematic diagram of the water inlet pipe and the connecting piece disclosed by the embodiment of the present application;

[0055] Figure 8 A radial cross-sectional view of the water inlet pipe disclosed by the embodiment of the present application;

[0056] Figure 9 AFigure 5 Cross-sectional view at A-A;

[0057] Figure 10 For Figure 9 Enlarged view at A in the middle.

[0058] Legend of reference signs:

[0059] 100 - thick film heating assembly;

[0060] 1 - heating core; 1a - first surface; 1b - first side; 1c - second side; 1d - second surface; 11 - flow channel; 12 - stop face;

[0061] 2 - heating film;

[0062] 3 - water inlet pipe; 31 - water inlet cavity; 32 - opening; 321 - groove;

[0063] 4 - water outlet pipe;

[0064] 5 - connecting piece; 51 - through hole; 511 - stop; 52 - flange;

[0065] 6 - heating film pad;

[0066] 7 - temperature sensing collection wire harness;

[0067] X - first direction. DETAILED DESCRIPTION

[0068] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some 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 of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0069] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like 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 used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0070] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the 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 of ordinary skill in the art can understand the specific meaning of these terms in the present application according to the specific situation.

[0071] In addition, the terms "mount", "set", "provided with", "connected", "linked" should be broadly understood. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or internal communication between two devices, elements or components. The specific meaning of the above terms in this application can be understood by those skilled in the art according to the specific circumstances.

[0072] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific type and structure may 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.

[0073] The vehicle heater, also known as the heater part of the automobile coolant heater or water heating type heater system, is a component used to heat the 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 the 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.

[0074] At present, thick film heating technology is applied to the heating assembly of the vehicle heater. Thick film heating technology refers to the use of rare earth thick film electric heating material, which is printed on various substrates (stainless steel, aluminum oxide, aluminum nitride, glass, ceramic, etc.) by screen printing process, and then heated by power supply 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, thereby heating the coolant.

[0075] In the related art, the size of the heating core is large, and the size relationship between the cross-sectional area of the flow channel in the heating core and the cross-sectional area of the water inlet cavity in the water inlet pipe causes the liquid to not flow through each flow channel of the heating core, but enters the flow channel at the front end, resulting in uneven distribution of the liquid between the water inlet cavity and the flow channel, and greatly reducing the heat exchange efficiency of the thick film heating assembly.

[0076] Based on this, the present application discloses a thick film heating assembly and a vehicle heater, which can make the liquid enter each flow channel when entering the flow channel from the water inlet pipe, avoid the situation that some flow channels have no liquid, ensure the uniformity of the liquid flow between the water inlet pipe and the flow channel, and improve the heat exchange efficiency of the thick film heating assembly.

[0077] The technical scheme will be further described below with reference to the embodiments and the drawings.

[0078] Please refer to Figures 1 to 3An embodiment of the present application provides a thick film heating assembly 100, which comprises a heating core 1, the heating core 1 has a first surface 1a, a first side 1b and a second side 1c, the first side 1b and the second side 1c are connected to two sides of the first surface 1a, as shown in Figure 6 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, and the flow channels 11 penetrate through the first side 1b and the second side 1c. The flow channels 11 are used for flowing of liquid such as coolant or water, so that the heating core 1 heats the liquid in the flow channels 11.

[0079] As shown in Figure 1 and Figure 6 The thick film heating assembly 100 further comprises a heating film 2, the heating film 2 is arranged on the first surface 1a of the heating core 1, and heat emitted by the heating film 2 heats the liquid in the flow channels 11.

[0080] In combination with Figure 3 and Figure 4 The thick film heating assembly 100 further comprises a water inlet pipe 3, the water inlet pipe 3 is connected to the first side 1b of the heating core 1 and communicates with the plurality of flow channels 11, and a water inlet cavity 31 is formed in the water inlet pipe 3. The water inlet pipe 3 communicates with a source of liquid such as coolant or water provided by the outside, and the coolant or water is delivered into the flow channels 11 through the water inlet pipe 3.

[0081] The thick film heating assembly 100 further comprises a water outlet pipe 4, the water outlet pipe 4 is connected to the second side 1c of the heating core 1 and communicates with the plurality of flow channels 11. The water outlet pipe 4 communicates with a heating system in a car, and the heated liquid such as coolant or water is delivered into the heating system through the water outlet pipe 4, and warm air is provided to the inside of the car through the heating system.

[0082] The minimum cross-sectional area of the water inlet cavity 31 of the water inlet pipe 3 along the radial direction is greater than the maximum cross-sectional area of each flow channel 11 along the first direction X.

[0083] Wherein, the first direction X is the direction from left to right in Figure 5 , and each flow channel 11 refers to each of all the flow channels 11, that is to say, the minimum cross-sectional area of the water inlet cavity 31 along the radial direction is greater than the maximum cross-sectional area of any one of all the flow channels 11 along the first direction X.

[0084] It should be noted that in the embodiment, the inner diameter of the water inlet pipe 3 is not equal everywhere, that is, the inner diameter of the water inlet pipe 3 is large in some places and small in some places, so the minimum cross-sectional area of the water inlet cavity 31 along the radial direction refers to the minimum area of the cross section of the water inlet cavity 31 along the radial direction of the water inlet pipe 3, and the maximum cross-sectional area of the flow channel 11 along the first direction X refers to the maximum area of the cross section of the flow channel 11.

[0085] Since coolant or water enters the water inlet chamber 31 through the inlet of the water inlet pipe 3, and then flows from the water inlet chamber 31 into the flow channel 11 of the heating core 1, if the minimum cross-sectional area of ​​the water inlet chamber 31 along the radial direction of the water inlet pipe 3 is equal to the maximum cross-sectional area of ​​each flow channel 11 along the first direction X, or if the minimum cross-sectional area of ​​the water inlet chamber 31 along the radial direction of the water inlet pipe 3 is less than the maximum cross-sectional area of ​​each flow channel 11 along the first direction X, the liquid cannot fill the entire water inlet chamber 31 after entering the water inlet chamber 31 from the inlet of the water inlet pipe 3. This will cause the liquid to directly enter the flow channel 11 near the inlet of the water inlet pipe 3, reducing the amount of liquid entering the rear end of the water inlet chamber 31, resulting in a reduction in the flow rate in the flow channel 11 far from the inlet of the water inlet pipe 3, or even no liquid passing through the flow channel 11 far from the inlet of the water inlet pipe 3. This will cause uneven liquid flow in the heating core 1, resulting in a lower heating efficiency of the heating core 1, and consequently a worse heat exchange efficiency of the thick film heating assembly 100.

[0086] Therefore, in this embodiment, the minimum cross-sectional area of ​​the water inlet cavity 31 along the radial direction is smaller than the maximum cross-sectional area of ​​each flow channel 11 along the first direction X. This ensures that after the liquid enters the water inlet cavity 31 from the water inlet pipe 3, it can uniformly enter each flow channel 11, making the liquid flow more uniform within the flow channel 11. Furthermore, when the liquid enters the flow channel 11 from the water inlet cavity 31 of the water inlet pipe 3, the flow resistance of the liquid within the flow channel 11 is reduced because the cross-sectional area of ​​the flow channel 11 is smaller than that of the water inlet cavity 31. This ensures uniform flow of the liquid within the flow channel 11, improves the heating efficiency of the heating core 1, and thus improves the heat exchange efficiency of the thick film heating assembly 100.

[0087] In some embodiments, such as Figure 4 As shown, the heating core 1 also includes a second surface 1d, which is disposed opposite to the first surface 1a. Both the first surface 1a and the second surface 1d of the heating core 1 are provided with a heating film 2.

[0088] Since both the first surface 1a and the second surface 1d are covered with the heating film 2, the heating area is significantly increased. A larger heating area allows for faster heat transfer into the flow channels 11 of the heating core 1, thereby improving overall heating efficiency. Furthermore, the double-sided heating design helps ensure temperature uniformity of the heating core 1 during the heating process. When both surfaces are heated, heat can be distributed more evenly throughout the heating core 1, reducing temperature gradients. This not only improves the heating effect but also extends the service life of the heating core 1, preventing damage caused by localized overheating.

[0089] It should be noted that the heating film 2 includes an insulating layer, a resistance layer, a conductor layer and a protective layer, and the heating film 2 is printed on the surface of the heating core 1 by a screen printing process. When printing the heating film 2, first, the insulating layer is printed on the surface of the heating core 1, and then the resistance layer is printed on the insulating layer. The insulating layer can effectively prevent the current from passing through the heating core 1 directly, avoiding the risk of short circuit and electric shock, and the insulating layer can reduce the influence of environmental factors on the resistance layer, thereby improving the stability and service life of the heating film 2. Secondly, the conductor layer is printed on the resistance layer. The conductor layer has good conductivity, and through the conductor layer, the resistance of the heating film 2 can be reduced, thereby reducing energy consumption and improving heating efficiency. In addition, the design of the conductor layer can ensure that the current is evenly distributed on the heating film 2, avoiding local overheating and current concentration, thereby improving the uniformity and stability of heating. Finally, the protective layer is printed on the conductor layer. The protective layer can resist external physical impact and wear, protect the heating film 2 from damage, and the protective layer has waterproof and moisture-proof functions, which can prevent water and other liquids from entering the inside of the heating film 2, ensuring the normal work of the heating film 2.

[0090] In addition, the thick film heating assembly 100 further comprises a heating film pad 6, which is arranged on the first surface 1a of the heating core 1. The heating film pad 6 is used to connect an external power supply to the conductor layer in the heating film 2.

[0091] For example, when the heating film pad 6 supplies power to the conductor layer, the conductor layer supplies power to the resistance layer, and the resistance layer generates heat after being powered on. The heat emitted by the resistance layer is transferred to the flow channel 11 and exchanges heat with the liquid such as coolant or water in the flow channel 11 to complete the heating of the coolant or water.

[0092] In some embodiments, as shown in Figure 6 along the axial direction of the water inlet pipe 3, the inner diameter of the water inlet pipe 3 is equal everywhere, and along the extension direction of the flow channel 11, the cross-sectional area of the flow channel 11 is equal everywhere. This means that the water inlet pipe 3 is a uniform pipe, and the cross-sectional area of the water inlet cavity 31 along the radial direction is equal everywhere, and the flow channel 11 is a channel with uniform internal space.

[0093] If the cross-sectional area of part of the water inlet cavity 31 along the radial direction is not equal, this will cause the flow resistance of the liquid to change constantly during the process of the liquid entering the water inlet cavity 31 from the inlet of the water inlet pipe 3, causing the liquid to generate more pressure loss in the water inlet cavity 31. Similarly, if the cross-sectional area of part of the flow channel 11 along the first direction is not equal, it will cause the flow resistance of the liquid in the flow channel 11 to change constantly during the process of the liquid flowing in the flow channel 11, causing the liquid to flow slowly in the flow channel 11, which will further cause the heating efficiency of the heating core 1 to decrease.

[0094] Therefore, in the embodiment of the present application, the inner diameter of the water inlet pipe 3 is equal everywhere, and the cross-sectional area of the flow channel 11 is equal everywhere, which avoids pressure loss of the liquid during the flow process in the water inlet cavity 31 and the flow channel 11, ensures sufficient flow pressure of the liquid, and further ensures the heating efficiency of the heating core 1.

[0095] In some embodiments, in combination with Figure 4 and Figure 6 , the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of one flow channel 11 along the first direction X is 10-30.

[0096] When the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of one flow channel 11 along the first direction X is less than 10, after the liquid enters the water inlet cavity 31 from the inlet of the water inlet pipe 3, it will produce deflection or vortex at the rear end of the water inlet cavity, which will cause the flow of the liquid into the flow channel 11 away from the inlet of the water inlet pipe 3 to be smaller, thereby causing the flow uniformity of the liquid in the flow channel 11 to be poor, and further reducing the heating efficiency of the heating core 1.

[0097] When the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of one flow channel 11 along the first direction X is greater than 30, it means that the inner diameter of the water inlet pipe 3 is large. Although this will increase the flow of the liquid in the water inlet pipe 3, it will cause the size of the water inlet pipe 3 to be large, thereby making the overall size of the thick-film heating assembly 100 large. Since the thick-film heating assembly 100 is mostly used in the heat exchange system in the vehicle, the space in the vehicle is compact, and the large size of the water inlet pipe 3 is not conducive to the compact layout in the vehicle.

[0098] Therefore, in the embodiment, the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of one flow channel 11 along the first direction X is 10-30, which ensures the flow uniformity of the liquid in the flow channel 11. Since the liquid is fully mixed and uniformly distributed in the water inlet cavity 31, when the liquid enters the flow channel 11 and flows through the heating film 2, it can more uniformly absorb heat energy, thereby improving the heating efficiency of the heating core 1, and the size of the thick-film heating assembly 100 can meet the compact layout in the vehicle.

[0099] It should be noted that when the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of one flow channel 11 along the first direction X is between 10-30, the greater the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of one flow channel 11 along the first direction X, the more uniform the flow of the liquid in the flow channel 11, and the smaller the resistance of the liquid flow. When the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of one flow channel 11 along the first direction X exceeds 30, the flow field of the liquid in the flow channel 11 tends to be stable.

[0100] In some embodiments, the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of one flow channel 11 along the first direction X is 15-20.

[0101] When the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of a flow channel 11 along the first direction X is within 10-15, the water inlet cavity 31 can not provide sufficient liquid space to ensure uniform distribution of the liquid before entering the flow channel 11. The uneven flow of the liquid in the flow channel 11 can lead to uneven heating of the liquid by the heating film 2, thereby affecting the heating efficiency of the heating core 1.

[0102] When the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of a flow channel 11 along the first direction X is within 20-30, while meeting the uniform flow of the liquid in the flow channel 11, it leads to the increase of the size and weight of the water inlet pipe 3, increases the layout space of the thick-film heating assembly 100, and also increases the manufacturing cost.

[0103] Therefore, in the present embodiment, when the ratio of the cross-sectional area of the water inlet cavity 31 along the radial direction to the cross-sectional area of a flow channel 11 along the first direction X is within 15-20, the water inlet cavity 31 can better balance the distribution of the liquid, ensuring that each flow channel 11 can obtain a relatively uniform fluid flow, which helps to reduce the decrease of heating efficiency and the increase of energy consumption caused by uneven distribution of the liquid. Moreover, this further reduces the resistance of the liquid when flowing into and out of the flow channel 11, which helps to improve the fluid dynamics performance of the thick-film heating assembly 100, reduce energy consumption, and improve overall efficiency. In addition, within this ratio range, the flow of the liquid in the flow channel 11 is more uniform, thereby improving the uniformity of the heating of the fluid by the heating film 2 and improving the heating efficiency of the heating core 1.

[0104] In some embodiments, in combination with Figure 5 and Figure 6 , the extension direction of the flow channel 11 is perpendicular to the axial direction of the water inlet pipe 3. That is to say, the flow channel 11 and the water inlet pipe 3 are vertically arranged.

[0105] If an “S”-shaped waterway is formed between the flow channel 11 and the water inlet pipe 3, due to the presence of more bends in the waterway, the liquid flowing in the waterway will generate friction at the bends, resulting in excessive resistance of the liquid flow, and thus reducing the heating efficiency of the heating core 1. If the resistance in the flow process is to be overcome, a larger pumping pressure needs to be provided to the liquid, which will increase the energy consumption.

[0106] If a “U”-shaped waterway is formed between the flow channel 11 and the water inlet pipe 3, vortexes and air bubbles will be generated at the water inlet end of the “U”-shaped waterway, thereby affecting the flow stability of the liquid, and further leading to the reduction of the heating efficiency of the heating core 1. Moreover, when the liquid flows in the “U”-shaped waterway, the flow direction of the liquid will have a 180° detour, and when the flow direction of the liquid changes, the liquid will be subjected to a larger resistance, thereby leading to the reduction of the heat exchange efficiency of the thick-film heating assembly 100.

[0107] Therefore, in the embodiment, the flow channel 11 is arranged vertically to the water inlet pipe 3, which helps the liquid to achieve better turning and distribution when entering the flow channel 11, and since the liquid flows into the water inlet pipe 3 at a certain speed, the vertical flow channel 11 can ensure that the formation of vortex and turbulent flow is reduced when the liquid turns, thereby reducing the pressure loss, which also helps the liquid to form a more uniform and stable flow state in the flow channel 11, improving the heating efficiency.

[0108] In some embodiments, as shown in Figure 7 and Figure 8 , the water inlet pipe 3 is provided with an opening 32 on the side facing the heating core 1, and the width of the opening 32 is greater than the thickness of the heating core 1 in the direction perpendicular to the first surface 1a.

[0109] The heating core 1 further comprises a connecting piece 5 for connecting the heating core 1 at the end close to the first side 1b to the opening 32 of the water inlet pipe 3.

[0110] Since the width of the opening 32 of the water inlet pipe 3 is greater than the thickness of the heating core 1, the heating core 1 cannot be directly connected at the opening of the water inlet pipe 3, so the heating core 1 is connected at the opening 32 of the water inlet pipe 3 through the connecting piece 5.

[0111] In some embodiments, as shown in Figure 9 , the connecting piece 5 is sealingly connected to the opening 32 of the water inlet pipe 3, the connecting piece 5 is provided with a through hole 51 penetrating through the connecting piece 5 in the extension direction of the flow channel 11, and the end of the heating core 1 close to the first side 1b extends into the through hole 51 of the connecting piece 5 and is fixedly connected to the through hole 51.

[0112] Since the water inlet pipe 3 is provided with an opening 32 on the side facing the heating core 1, after the water inlet pipe 3 and the heating core 1 are assembled, it is necessary to prevent liquid from leaking between the opening 32 of the water inlet pipe 3 and the connecting piece 5. Therefore, by sealingly connecting the connecting piece 5 to the opening 32 of the water inlet pipe 3, the leakage of liquid during the process of flowing from the water inlet pipe 3 to the flow channel 11 is avoided, and the end of the heating core 1 close to the first side 1b extends into the through hole 51 of the connecting piece 5, ensuring that the liquid can smoothly flow from the water inlet cavity 31 of the water inlet pipe 3 into the flow channel 11 of the heating core 1, ensuring the heating efficiency of the heating core 1.

[0113] It should be noted that the sealing connection between the connecting piece 5 and the opening 32 can be sealed by flange, or by welding, or by sealing ring, which is not limited in the embodiment. Exemplarily, the connecting piece 5 and the opening 32 are sealed by flange, and the flange connection is a common sealing connection method, which uses flange and bolts to tightly press the connecting piece 5 and the opening 32 together, which can facilitate the disassembly and replacement of the water inlet pipe 3 or the connecting piece 5.

[0114] In some embodiments, in combination with Figure 9 and Figure 10 , the opening 32 of the water inlet pipe 3 has a groove 321 near the edge of the heating core 1, and the connecting piece 5 has a flange 52 which extends into the groove 321 and abuts the groove bottom along the extension direction of the flow channel 11.

[0115] Through the groove 321 and the flange 52, on the one hand, the contact area between the connecting piece 5 and the opening 32 can be increased, thereby improving the stability of the connection; on the other hand, the flange 52 extends into the groove 321 and abuts the groove bottom, forming an effective sealing barrier, which can reduce the risk of liquid leakage when flowing from the water inlet cavity 31 into the flow channel 11, and ensure smooth flow of the liquid. In addition, the groove 321 and the flange 52 make it easier to align and position the connecting piece 5 during installation, reducing the difficulty of installation, improving the efficiency of installation, and also reducing the connection problems caused by improper installation.

[0116] In some embodiments, in combination with Figure 9 and Figure 10 , the inner wall of the through hole 51 has a stop portion 511, and the heating core 1 has a stop surface 12 near one end of the first side surface 1b, and the stop portion 511 abuts the stop surface 12 along the extension direction of the flow channel 11. The cooperation of the stop portion 511 and the stop surface 12 ensures the accurate positioning of the heating core 1 in the through hole 51, preventing the heating core 1 from moving in the extension direction of the flow channel 11, thereby achieving stable fixation and ensuring accurate alignment between the flow channel 11 and the opening 32. Moreover, the abutment of the stop portion 511 and the stop surface 12 increases the contact area between the heating core 1 and the connecting piece 5, thereby improving the connection strength, helping to prevent loosening of the connection due to vibration or liquid pressure, and enhancing the overall stability between the heating core 1 and the connecting piece 5.

[0117] In some embodiments, as shown in Figure 10 , the end surface of the heating core 1 is flush with the surface of the connecting piece 5 facing the water inlet cavity 31.

[0118] If the end surface of the heating core 1 protrudes from the surface of the connecting piece 5 facing the water inlet cavity 31, that is, when the one end of the heating core 1 near the first side surface 1b extends into the water inlet cavity 31 of the water inlet pipe 3, the flow of liquid in the water inlet cavity of the water inlet pipe 3 will be hindered or interfered by the part of the heating core 1 extending into the water inlet cavity 31, thereby increasing the resistance of the liquid flowing in the water inlet cavity 31 and reducing the smoothness of the liquid flow, thereby reducing the heating efficiency of the heating core 1.

[0119] Therefore, the end surface of the heating core 1 flush with the surface of the connecting piece 5 towards the water inlet cavity 31 can ensure the uniform distribution and smooth flow of the liquid in the water inlet cavity 31, and further ensure that the liquid has sufficient flow pressure when entering the flow channel 11, thereby improving the heating efficiency of the heating core 1.

[0120] In some embodiments, the water inlet pipe 3 and the heating core 1 are both connected with the connecting piece 5 through a laser welding process. Laser welding is a high-efficiency and precise welding method using a high-energy density laser beam as a heat source. It heats the surface to be processed by laser radiation, and the surface heat spreads to the inside through heat conduction. By controlling laser parameters such as pulse width, energy, peak power, and repetition frequency, the workpiece is melted to form a specific molten pool.

[0121] Since the laser welding process can achieve high precision and high quality welding, it can ensure that the connection between the water inlet pipe 3, the heating core 1 and the connecting piece 5 is firm and reliable. Moreover, the weld formed by laser welding has high strength and sealing performance, can withstand a large pressure, and effectively prevents liquid leakage.

[0122] In addition, the laser welding process can reduce thermal deformation and residual stress during welding, thereby improving the mechanical properties and fatigue resistance of the welded joint, which makes the thick-film heating assembly 100 more stable and reliable during use, and prolongs its service life.

[0123] It should be noted that the water outlet pipe 4 has the same structure as the water inlet pipe 3, and the water outlet pipe 4 and the water inlet pipe 3 can be used interchangeably. Moreover, the water outlet pipe 4 and the heating core 1 are also connected through the connecting piece 5, and the connection between them and the connecting piece 5 is achieved through a laser welding process, which has similar effects to the water inlet pipe 3, and this embodiment will not be described here.

[0124] In some embodiments, the heating core 1 is integrally formed through an extrusion process. Extrusion molding is a molding 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, forcing the metal blank to extrude from the mold hole by applying a strong pressure, and forming a product with a specific shape and size.

[0125] The extrusion molding process can make the materials of the heating core 1 more tightly bonded together, reducing the occurrence 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, one-piece molding can reduce the number of 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.

[0126] In some embodiments, the material of the heating core 1 is aluminum. Since aluminum has good thermal conductivity, it can quickly transfer heat to all parts of the heating core 1, thereby improving 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 reduce overall weight while maintaining high performance, facilitating installation and transportation. At the same time, the strength of aluminum is also high enough to withstand certain mechanical and thermal stresses, ensuring the long-term use reliability of the heating core 1.

[0127] It should be noted that 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.

[0128] In addition, the micro-channel flat tube has a flat shape and a small flow channel 11 size, 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 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.

[0129] It should be noted that, as Figure 3As shown, the thick-film heating assembly 100 also includes a temperature sensing collection wire harness 7 arranged on the outer surface of the water inlet pipe 3 and the water outlet pipe 4. The temperature sensing collection wire harness 7 is used to collect the temperature of the liquid in the water inlet pipe 3 and the water outlet pipe 4. Through the temperature sensing collection wire harness 7, the temperature of the liquid in the water inlet pipe 3 and the water outlet pipe 4 can be monitored in real time, which helps to control the heating film 2 to respond to temperature changes in a timely manner, adjust the heating power, and ensure that the liquid operates within a suitable temperature range. Moreover, by monitoring the temperature in real time, the heating power of the thick-film heating assembly 100 can be accurately controlled, avoiding the situation of excessive heating or insufficient heating, which helps to improve the heating efficiency, reduce energy consumption, and reduce operating costs. In addition, the real-time monitoring function of the temperature sensing collection wire harness 7 helps to discover temperature abnormalities such as overheating or overcooling in a timely manner. This can remind the operator to take timely measures to prevent damage to the thick-film heating assembly 100 or the occurrence of safety accidents.

[0130] 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.

[0131] The vehicle heater further comprises the thick-film heating assembly 100 of the first aspect, which is arranged in the containing cavity of the shell and is used to heat the coolant.

[0132] Since the heat exchange efficiency of the thick-film heating assembly 100 is improved, the vehicle heater using the thick-film heating assembly 100 can achieve efficient heating of the coolant, ensuring that the coolant reaches the required temperature in a short time, thereby improving the heating efficiency.

[0133] 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 application relates to a thick-film heating assembly. The application relates to a thick-film heating assembly. The application relates to a thick-film heating assembly. The application relates to a thick-film heating assembly. The application relates to a thick-film heating assembly.

2. The thick film heating assembly of claim 1, wherein, The application relates to a thick-film heating assembly. The application relates to a thick-film heating assembly.

3. The thick film heating assembly of claim 2, wherein, The application relates to a thick-film heating assembly.

4. The thick film heating assembly of claim 3, wherein, The application relates to a thick-film heating assembly.

5. The thick film heating assembly of claim 1, wherein, The application relates to a thick-film heating assembly.

6. The thick film heating assembly of claim 1, wherein, The application relates to a thick-film heating assembly. The application relates to a thick-film heating assembly.

7. The thick film heating assembly of claim 6, wherein, The application relates to a thick-film heating assembly.

8. The thick film heating assembly of claim 7, wherein, The application relates to a thick-film heating assembly.

9. The thick film heating assembly of claim 7, wherein, The application relates to a thick-film heating assembly.

10. The thick film heating assembly of claim 7, wherein, The application relates to a thick-film heating assembly.

11. The thick film heating assembly of claim 6, wherein, The application relates to a thick-film heating assembly.

12. The thick film heating assembly according to any one of claims 1-11, characterized in that, The application relates to a thick-film heating assembly. The application relates to a thick-film heating assembly.

13. The thick film heating assembly according to any one of claims 1 to 11, characterized in that The application relates to a thick-film heating assembly.

14. The thick film heating assembly of claim 13, wherein, The application relates to a thick-film heating assembly.

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