Double chamber thick film heater and flow heater

Abstract

The present application discloses a dual-chamber thick film heating element and a flow heater. The dual-chamber thick film heating element includes: an outer frame, which is surrounded by a frame with openings on opposite sides; two heating plates, each of which includes a substrate and a heating coil, and the heating coil is arranged on the first side of the substrate. The substrates of the two heating plates are respectively welded to the opposite sides of the frame to cooperate with the outer frame to form a sealed accommodating cavity; two heat-conducting fin modules, which are respectively arranged on the second side of the substrate of the corresponding heating plate and are thermally connected to the substrate, and the second side is arranged back to the first side; a water-blocking plate is arranged in the accommodating cavity and divides the accommodating cavity into two chambers, and each heat-conducting fin module is located in the corresponding chamber. The present application can realize dual-chamber flow heating, which not only has a high heating rate and energy conversion efficiency, can quickly heat a large amount of flowing liquid to a high temperature, but also has a good spatial structure optimization effect.

Description

Technical Field

[0001] The present application relates to the technical field of thick film heating, and in particular to a double-chamber thick film heating element and a flow heater. Background Art

[0002] A flow heater is a heating device for heating liquids such as water or aqueous solutions, and is generally used in vehicles such as automobiles or various engineering machinery. The flow heater is provided with a heating plate and heat-conducting fins (also known as "heat-conducting fins"). The heating plate generally adopts thick film heating technology, that is, it includes a substrate and a heating coil arranged on one side of the substrate, and the fins are arranged on the other side of the substrate. The heating coil is electrically heated, and the fins conduct heat to the liquid to achieve liquid heating.

[0003] When applied to scenes such as automobiles, flow heaters are developed with the consistent goal of compact design, low manufacturing cost and high efficiency, so that a large amount of flowing liquid can be heated to a required temperature in a short time. However, existing flow heaters usually have only one chamber, also known as "single-chamber flow heaters", and the heating plate is set on one side of the flow heater, with low heat conduction efficiency and limited heating rate, which is particularly difficult to meet the demand of quickly heating a large amount of flowing liquid to a higher temperature. Utility Model Content

[0004] In view of this, the present application provides a dual-chamber thick film heater and a flow heater, which can improve the problem of low heating rate of single-chamber flow heaters and the resulting difficulty in quickly heating a large amount of flowing liquid to a higher temperature.

[0005] The present application provides a double-chamber thick film heating element, comprising:

[0006] An outer frame is formed to form a frame with openings on two opposite sides;

[0007] Two heating plates, each of which comprises a substrate and a heating coil, wherein the heating coil is disposed on a first side of the substrate, and the substrates of the two heating plates are respectively welded to opposite sides of the frame to cooperate with the outer frame to form a sealed accommodating cavity;

[0008] Two heat-conducting fin modules are respectively arranged on the second side surfaces of the substrate of the corresponding heating plate and are heat-conductingly connected to the substrate, and the second side surfaces are arranged opposite to the first side surfaces;

[0009] The water-blocking plate is arranged in the accommodating cavity and divides the accommodating cavity into two chambers. Each of the heat-conducting fin modules is located in a corresponding chamber.

[0010] Optionally, the thermal fin module includes a first fin, a second fin and a third fin, the first fin and the second fin are arranged opposite to each other along a first direction, and the third fin is arranged between the first fin and the second fin; the first fin is provided with a first channel, the second fin is provided with a second channel, and the third fin is provided with a third channel, and the third channel connects the first channel and the second channel; the water baffle is provided with a convex strip, one end of which extends to the third fin, and the convex strip is located between the first fin and the second fin to separate the first channel and the second channel.

[0011] Optionally, the outer frame is provided with two pipe openings, and the accommodating cavity is connected to the outside through the two pipe openings; and along the direction parallel to the watertight plate, the two pipe openings do not expose one side edge corresponding to the watertight plate, and one of the pipe openings is connected to the first channel, and the other pipe opening is connected to the second channel.

[0012] Optionally, the water-blocking plate is provided with two air-avoidance areas; the outer frame is provided with two metal cylinders, each of which is connected to the inner wall of the frame and extends to the corresponding air-avoidance area, and an opening is provided at one end of the metal cylinder connected to the frame to allow a temperature sensor to be inserted into the metal cylinder from outside the frame.

[0013] Optionally, each of the air avoidance areas is arranged adjacent to a corresponding pipe opening.

[0014] Optionally, along a direction parallel to the baffle, each pipe opening exposes a corresponding metal cylinder.

[0015] Optionally, the edge of the water-blocking plate is welded to the inner wall of the frame so as to be disposed in the accommodating cavity.

[0016] Optionally, any one of the first fin, the second fin and the third fin includes a first boss and a second boss arranged at an alternating interval, the first boss and the second boss are both hollow inside, and the height of the first boss is greater than the height of the second boss; the first boss and the second boss of the first fin are connected in the second direction to form the first channel, the first boss and the second boss of the second fin are connected in the opposite direction of the second direction to form the second channel, and the first boss and the second boss of the third fin are connected in the first direction to form the third channel, which is used to connect the first channel and the second channel.

[0017] Optionally, the water-blocking plate is an integrally formed plate.

[0018] Optionally, the first boss abuts against the water baffle plate so that the water baffle plate supports the heating plate and the thermal fin module.

[0019] The present application provides a flow heater, comprising any of the above double-chamber thick film heating elements.

[0020] As described above, the present application forms a sealed accommodating chamber by cooperating an outer frame and two heating plates, and arranges a water-blocking plate in the accommodating chamber to divide the accommodating chamber into two chambers. The two heating plates are electrically heated to transfer heat to two heat-conducting fin modules, which then transfer heat to the liquid in the accommodating chamber to achieve liquid heating. Therefore, the present application can realize dual-chamber flow heating with a high heating rate and energy conversion efficiency, and can quickly heat a large amount of flowing liquid to a higher temperature.

[0021] Furthermore, the present application also has a good spatial structure optimization effect by, for example, two chambers sharing one pipe opening as an inlet and another pipe opening as an outlet.

[0022] In addition, the present application designs each fin to include a first boss and a second boss that are arranged at staggered intervals and have different heights. When the liquid is controlled to flow toward the outlet through the first boss and the second boss, the bubbles in the liquid can be punctured, thereby improving the dry burning caused by the bubbles adhering to the heating plate and the fins and reducing the risk of damage to the heating plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a double-chamber thick film heating element provided in an embodiment of the present application;

[0024] Figure 2 yes Figure 1 The schematic diagram of the structure explosion of the double-chamber thick film heater shown;

[0025] Figure 3 yes Figure 1 A schematic cross-sectional view of a double-chamber thick film heating element along the AA direction is shown;

[0026] Figure 4 The thermal fin module is Figure 1 A top view of the structure in the double-chamber thick film heating element shown;

[0027] Figure 5 It is a structural schematic diagram of a heat-conducting fin module provided in an embodiment of the present application;

[0028] Figure 6 This is a schematic diagram of the structure of a water-blocking plate and an outer frame provided in an embodiment of the present application after being matched;

[0029] Figure 7 It is a structural schematic diagram of a flow heater provided in an embodiment of the present application;

[0030] Figure 8 yes Figure 7Schematic diagram of the structure explosion of the flow heater shown.

[0031] First direction x Second direction y Third direction z

[0032] Double chamber thick film heating element 10

[0033] Accommodating chamber 10a chamber 10b

[0034] Frame 11

[0035] First pipe opening 111 Second pipe opening 112 Metal cylinder 113

[0036] Heating plate 12

[0037] Substrate 121 Heating coil 122 Solder pad 123

[0038] Thermal fin module 13

[0039] First fin 131 Second fin 132 Third fin 133

[0040] First boss 134 Second boss 135 Notch 136

[0041] Waterproof board 14

[0042] The convex strip 141 of the avoidance area 14a

[0043] Temperature sensor 15

[0044] Flow Heater 20

[0045] Housing 21 Base 22 Control panel 23 Accommodating chamber 20a DETAILED DESCRIPTION

[0046] In order to solve the above problems existing in the prior art, the present application provides a dual-chamber thick film heating element and a flow heater. The two protection themes are based on the same concept, and the principles of solving the problems are basically the same or similar. The implementation methods of each protection theme can refer to each other, and the repeated parts will not be repeated.

[0047] The present application forms a sealed accommodating cavity by cooperating an outer frame and two heating plates, and arranges a water-blocking plate in the accommodating cavity to separate the accommodating cavity into two chambers, any chamber can allow liquid (such as water) to flow in and flow inside it independently, and a heat-conducting fin module is arranged in any chamber, and the two heating plates are electrically connected to generate heat to transfer heat to the two heat-conducting fin modules, and then the two heat-conducting fin modules respectively transfer heat to the liquid in the accommodating cavity, so as to realize liquid heating. Therefore, the present application can realize dual-chamber flow heating, and the flow heater with the dual-chamber thick film heating element can also be called a "dual-chamber flow heater", which has a high heating rate and can quickly heat a large amount of flowing liquid to a higher temperature.

[0048] In the dual-chamber thick film heating element and flow heater, the specific expressions of parameters such as shape, quantity, size, etc. of each structural element including the outer frame, heating plate, thermal fin module and baffle can be determined according to the actual application scenario and the required adaptability of the configuration, and this application does not limit them.

[0049] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly described below in conjunction with specific embodiments and corresponding drawings. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of the embodiments. In the absence of conflict, the following embodiments and their technical features can be combined with each other and also belong to the technical solutions of the present application.

[0050] In the description of the embodiments of the present application, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the technical solutions of the corresponding embodiments, rather than indicating or implying that a device or element must have a specific orientation, be constructed and operated in a specific orientation, and should not be understood as a limitation on the present application.

[0051] For the convenience of describing and understanding the scheme of the present application, the width direction of the double-chamber thick film heating element (including the flow heater having the double-chamber thick film heating element) is referred to as the first direction x, the length direction (i.e., the height direction when in a standing posture) is referred to as the second direction y, and the thickness direction is referred to as the third direction z. The first direction x, the second direction y, and the third direction z are perpendicular to each other and can be regarded as the three coordinate axes of a three-dimensional rectangular coordinate system. It should be understood that the so-called perpendicularity in the whole application does not require that the angle between the two must be 90°, but allows a deviation of, for example, ±10°, that is, the so-called perpendicularity can be understood as the angle between any two directions being 80° to 100°. Similarly, the so-called parallelism in the whole application does not require that the angle between the two must be 0° or 180°, but allows a deviation of, for example, ±10°, that is, the so-called parallelism can be understood as the angle between any two directions being 0° to 10° or 170° to 190°.

[0052] Please also read Figures 1 to 6 , shows a schematic diagram of the coordination of a double-chamber thick film heating element 10 and some of its structural elements in an optional embodiment of the present application. The double-chamber thick film heating element 10 includes an outer frame 11, two heating plates 12, two heat-conducting fin modules 13 and a water-blocking plate 14.

[0053] The outer frame 11 is formed to have a frame with openings on two opposite sides. The frame can be rectangular as a whole, and two recessed areas are provided on the left and right sides of the lower end thereof. The recessed areas can be provided with fixing parts for fixing the double-chamber thick film heating element 10 to a position such as a wall by screw locking. Figure 7 and Figure 8 In the housing 21 shown in the figure, the outer frame 11 can be formed by a metal strip having a certain width (the width direction is parallel to the third direction z), and the frame is provided with openings on opposite sides along the third direction z.

[0054] Each heating plate 12 includes a substrate 121 and a heating coil 122. The heating coil 122 is arranged on a first side of the substrate 121 and is used to generate heat when powered. The substrates 121 of the two heating plates 12 are respectively welded to opposite sides of the frame to form a sealed accommodating cavity 10a with the outer frame 11. Optionally, the welding method is electron beam welding, and the sealing effect after welding is better.

[0055] The two heat-conducting fin modules 13 are respectively arranged on the second side of the substrate 121 of the corresponding heating plate 12, and the second side is arranged in reverse to the first side, that is, the first side and the second side are two large surfaces arranged in reverse along the thickness direction (i.e., the third direction z described by the solid arrow) of the substrate 121. In addition, the two heat-conducting fin modules 13 are respectively connected to the corresponding substrate 121 by heat conduction. The heat-conducting fin module 13 includes a plurality of fins, wherein a part of the fins is provided with a first channel, another part of the fins is provided with a second channel, and another part of the fins is provided with a third channel. The channel that allows liquid to flow in all the time in the first channel and the second channel can be called an "inflow channel", and the other channel that allows liquid to flow out can be called an "outflow channel". The third channel is used to connect the first channel and the second channel, so that the liquid can flow to the outflow channel via the inflow channel and finally flow out. For ease of description, the example of the present application is described by taking the first channel as the inflow channel and the second channel as the outflow channel as an example. It should be understood that other examples of the present application can also use the first channel as the outflow channel and the second channel as the inflow channel.

[0056] The edge of the water barrier 14 is welded to the inner wall of the frame, or assembled and joined in other ways, so as to be arranged in the accommodating cavity 10a. Figure 3 As shown, the accommodating cavity 10a is divided into two chambers 10b. The two chambers 10b are arranged on both sides of the water barrier 14 along the third direction x, and the orthographic projections of the two chambers 10b overlap along the third direction x. Each heat conducting fin module 13 is located in the corresponding chamber 10b.

[0057] It should be noted that the water barrier 14 can be a heat conductive plate with good thermal conductivity, or a plate with poor thermal conductivity or no thermal conductivity, for example, the water barrier 14 is an integrally formed plate, including but not limited to a plastic plate. In the scenario where the water barrier 14 is a heat conductive plate (including but not limited to a metal plate), the liquids in the two chambers 10b can be heat-conducted through the water barrier 14, which is conducive to ultimately achieving temperature balance of the liquids in the two chambers 10b.

[0058] In the example of the present application, along the direction parallel to the baffle 14, the two pipe openings do not expose one side edge (which can be regarded as the upper side edge) corresponding to the baffle 14, and the baffle 14 can be regarded as dividing the accommodating cavity 10a into two chambers 10b of different sizes. Here, along the third direction x, the minimum distance between the baffle 14 and each substrate 121 can be different, so that the volumes of the two chambers 10b are different. In other examples, the two chambers 10b can be symmetrically arranged along the baffle 14, and the optional structural elements for heating the two chambers 10b, such as the heating plate 12 and the heat-conducting fin module 13, are completely identical and symmetrically arranged, so that the two chambers 10b can achieve the same heating power and heating rate.

[0059] As described above, the present application divides the accommodating cavity 10a into two chambers 10b by a water baffle 14, and the two heating plates 12 are electrically heated to transfer heat to the two heat-conducting fin modules 13, and then the two heat-conducting fin modules 13 transfer heat to the liquid in the corresponding chamber 10b, thereby achieving liquid heating. In this way, the present application can achieve dual-chamber flow heating, with a high heating rate and energy conversion efficiency, and can quickly heat a large amount of flowing liquid to a higher temperature. It should be noted that the water baffle 14 can be a heat-conducting plate with good thermal conductivity, or a plate with poor thermal conductivity or no thermal conductivity; in the scenario where the water baffle 14 is a heat-conducting plate, the liquids in the two chambers 10b can conduct heat through the water baffle 14, which is conducive to ultimately achieving temperature balance of the liquids in the two chambers 10b.

[0060] See also Figures 1 to 6 The outer frame 11 is provided with two pipe openings, which are respectively called the first pipe opening 111 and the second pipe opening 112. For the convenience of description, the first pipe opening 111 is regarded as a pipe opening (also called "inlet") that allows liquid to flow in, and the second pipe opening 112 is regarded as a pipe opening (also called "outlet") that allows liquid to flow out. The accommodating cavity 10a (and any one of the two chambers 10b) is connected to the outside through the first pipe opening 111 and the second pipe opening 112. In one example, the upper part of the baffle 14 is not completely joined to the top wall of the outer frame 11, that is, the two chambers 10b are not completely separated from each other, such as Figure 6As shown, two air avoidance areas 14a are provided on the upper part of the water-blocking plate 14, which are respectively arranged adjacent to the corresponding pipe openings. Along the direction parallel to the water-blocking plate 14, the liquid flows into the accommodating chamber 10a from the first pipe opening 111, and is divided into two parts by the water-blocking plate 14 after passing through the corresponding air avoidance area 14a, one part flows into one of the chambers 10b, and the other part flows into the other chamber 10b; similarly, the liquid in the two chambers 10b flows out from the second pipe opening 112 after being heated and passing through the corresponding air avoidance area 14a. Here, the present application also has a good spatial structure optimization effect by, for example, two chambers 10b share one pipe opening (for example, the first pipe opening 111) as an inlet and another pipe opening (for example, the second pipe opening 112) as an outlet, and another example is that two chambers 10b share one water-blocking plate 14.

[0061] like Figure 2 and Figure 6 As shown, the outer frame 11 may be provided with two metal cylinders 113, each of which is connected to the inner wall of the frame and extends to the corresponding air-avoiding area 14a. An opening 15a is provided at one end of the metal cylinder 113 connected to the outer frame 11 to allow a temperature sensor (e.g., NTC, i.e., Negative Temperature Coefficient thermistor) 15 to be inserted into the metal cylinder 113 from outside the frame. The other end of the metal cylinder 113 is closed to prevent liquid from entering the metal cylinder 113. The two temperature sensors 15 can respectively detect the temperature of the liquid flowing in and out, and feed back to the control unit (e.g., Figure 7 and Figure 8 The control panel 23 shown in the figure is used to automatically adjust the heating power of the heating disk 12.

[0062] In one example, along a direction parallel to the baffle 14, each pipe opening exposes the corresponding metal cylinder 113, where the two metal cylinders 113 are located exactly at the inlet and outlet corresponding to the liquid, so that the internal temperature sensor 15 can more accurately measure the temperature of the liquid when it flows in and out.

[0063] See also Figure 2 , Figure 4 and Figure 5 The single heat-conducting fin module 13 includes a first fin 131, a second fin 132 and a third fin 133; along the first direction x, the first fin 131 and the second fin 132 are arranged opposite to each other, and the third fin 133 is arranged between the first fin 131 and the second fin 132. These fins can be aluminum alloy fins, or other fins that meet the heat conduction requirements.

[0064] Any one of the first fin 131, the second fin 132 and the third fin 133 is arranged in multiple rows (or multiple columns), and any one includes a first boss 134 and a second boss 135, also called "bosses", which are arranged alternately along the corresponding row direction (or the corresponding column direction).

[0065] For example, see Figures 1 to 5 As shown, with the first direction x as the horizontal direction and the second direction y as the vertical direction, the third fin 133 includes multiple rows of bosses, each row is provided with multiple first bosses 134 and multiple second bosses 135, and the first fin 131 and the second fin 132 respectively include multiple columns of bosses, each column is provided with multiple first bosses 134 and multiple second bosses 135. The so-called staggered arrangement can be understood as: in an arrangement direction of the same column or an arrangement direction of the same row, a second boss 135 is provided between any two adjacent first bosses 134, and a first boss 134 is provided between any two adjacent second bosses 135. There is a distance between any first boss 134 and the adjacent second boss 135 that is not equal to zero, that is, the two are arranged oppositely along the arrangement direction. Here, a notch 136 can be formed between the adjacent first bosses 134 and the second bosses 135 located in the same row or the same column.

[0066] It should be understood that the number of rows of bosses included in the third fin 133, the number of columns of bosses included in the first fin 131 and the second fin 132, and the number of first bosses 134 and second bosses 135 provided in each row and column are not limited in this application; the first fin 131 shown in the figure is provided with seven columns of bosses, the second fin 132 is provided with six columns of bosses, and the third fin 133 is provided with six rows of bosses, which is only for exemplary display.

[0067] In one example, along the line of sight in the third direction z, the orthographic projection of the third fin 133 is trapezoidal as a whole; along the first direction x, the lengths of each row of the first fin 131 (i.e., the lengths along the second direction y) decrease successively; along the opposite direction of the first direction x, the lengths of each row of the second fin 132 decrease successively. One end of each row of bosses of the third fin 133 is adjacent to a column corresponding to the first fin 131 and is connected to the hollow interior, and the other end is adjacent to a column corresponding to the second fin 132 and is connected to the hollow interior. Here, each third channel of the third fin 133 can be adjacent to and connected to the corresponding first channel and second channel. To adapt to this, the specific shapes of each first boss 134 and each second boss 135 can be adaptively designed, for example, in Figure 2 , Figure 4 and Figure 5In the example, in the adjacent area of ​​the third fin 133 and the first fin 131 and the second fin 132, the shape of the first boss 134 is different from that in other areas, and the shape of the second boss 135 in the adjacent area is also different from that in other areas.

[0068] like Figure 4 and Figure 5 As shown, in either the first fin 131 or the second fin 132, the first bosses 134 in the same row are aligned along the first direction x, and the second bosses 135 in the same row are aligned along the first direction x. Optionally, in the third fin 133, the first bosses 134 in the same column are aligned along the second direction y, and the second bosses 135 in the same column are aligned along the second direction y. This alignment arrangement can align the notches 136 between the first boss 134 and the adjacent second boss 135, which is conducive to the liquid flowing out of the first boss 134 or the second boss 135 through the notch 136 to still flow smoothly toward the predetermined outlet, and to flow back into the first boss 134 or the second boss 135.

[0069] The first boss 134 and the second boss 135 are both hollow inside. For example, the xz cross section of any boss can be trapezoidal, and its upper wall and two side walls are sheet-like parts, which are connected to each other to form a boss. In any of the first fin 131, the second fin 132 and the third fin 133, any first boss 134 is connected to the bottom of the adjacent second boss 135, the bottoms of any two adjacent first bosses 134 are connected, and the bottoms of any two adjacent second bosses 135 are connected. Here, for any fin, a groove is formed between two adjacent rows or two adjacent columns of bosses, and the groove is connected to the inside of the corresponding boss through the notch 136. The groove can also be regarded as the corresponding first channel, third channel and second channel. The cross-sectional shape of any fin (the xy cross-sectional shape of the first fin 131 and the second fin 132, and the xz cross-sectional shape of the third fin 133) is wavy as a whole, which is convenient for heat dissipation, and can quickly dissipate the heat to quickly transfer it to the liquid, while also increasing the heat conduction time between the liquid and the fin. In addition, any fin can be an integrally formed structural part, which can not only be produced, manufactured, transported and sold as an independent individual, but also facilitates rapid welding and assembly with a heating plate.

[0070] In one example, the bottoms of the first bosses 134 and the second bosses 135 of all fins and / or a portion of the fins are located on the same plane, and can be well welded to the flat heating plate 12 .

[0071] Continue reading Figures 2 to 5In each row of the first fins 131, the plurality of first bosses 134 and the plurality of second bosses 135 are hollowly connected in the second direction y, thereby forming a first channel, through which the liquid flows, for example Figure 1 The first nozzle 111 shown flows into the first channel. In each column of the second fins 132, the plurality of first bosses 134 and the plurality of second bosses 135 are hollowly connected in the opposite direction of the second direction y, thereby forming a second channel. In each row of the third fins 133, the plurality of first bosses 134 and the plurality of second bosses 135 are connected in the first direction x to form a third channel for connecting the first channel and the second channel, see Figure 4 The liquid flow direction is shown by the blank arrow in the middle, so that the liquid can flow to the second fin 132 through the first channel of the first fin 131 and finally flow out from the second channel. Optionally, the liquid can flow through, for example, Figure 1 The second nozzle 112 shown flows out to the target area. During the flow process, the first fin 131, the second fin 132 and the third fin 133 transfer the heat from the heating plate 12 to the liquid flowing through their respective surfaces and the vicinity, thereby heating the liquid.

[0072] The height of the first boss 134 is designed to be greater than the height of the second boss 135 in the present application, and the so-called height is the maximum length along the third direction z. This is equivalent to designing each heat-conducting fin to have bosses of different heights. When the heat-conducting fin module is applied to a flow heater, during the flow of liquid, the height difference formed by the bosses of different heights will disturb the original flow direction of the liquid, thereby generating additional force on the bubbles in the liquid, thereby puncturing the bubbles in the liquid, thereby improving the dry burning caused by the bubbles adhering to the heating plate 12 and the fins, and reducing the risk of damage to the heating plate 12.

[0073] In one example, the height of the first boss 134 is H1, and the height of the second boss 135 is H2, and they satisfy: 1 / 2*H1≦H2≦3 / 4*H1. The height ratio of the two bosses is set within the threshold range, and the height difference between the two can better disturb the original flow direction of the liquid, and the additional force on the bubbles in the liquid is greater, so that the bubbles in the liquid can be punctured better.

[0074] In one example, the first boss 134 includes a first portion and a second portion disposed vertically along the second direction y, the second portion being disposed below the first portion, and the two portions may actually be an integrally formed structural member, that is, the two portions referred to herein are only for the convenience of description, and do not limit the two portions to be independently manufactured and then spliced ​​to form the first boss 134. For the adjacent first boss 134 and second boss 135 located in the same direction, when observed along the same direction in which the two are located, the orthographic projections of the second boss 135 (the portion except the top wall) and the second portion of the first boss 134 overlap.

[0075] In one example, the number of rows of the first fins 131 is greater than the number of rows of the second fins 132. In this case, the number of first channels is greater than the number of second channels. The liquid flows through and exchanges heat with the heat-conducting fin module for a longer time, so that the liquid can be heated to a desired temperature in a shorter time. The number of rows of the second fins 132 and the number of rows of the third fins 133 can be equal. For the bosses in the first fins 131 that are not connected to the corresponding third fins 133, for example Figure 4 The first channels formed by the outermost row of bosses shown can be diverted to a part or all of the third channels of the third fins 133 through the notches 136 .

[0076] The water-blocking plate 14 is provided with a ridge 141, one end of which extends to the third fin 133. The ridge 141 is located between the first fin 131 and the second fin 132 to separate the first channel and the second channel to prevent the liquid from flowing directly from the first fin 131 to the second fin 132 in each chamber 10b, thereby preventing the liquid from being heated for a short time and failing to reach the preset temperature requirement.

[0077] In one example, in any chamber 10b, the first boss 134 with a larger height can abut against the water baffle 14 so that the water baffle 14 supports the heating plate 12 and the thermal fin module 13, thereby facilitating welding between the substrate 121 and the inner wall of the outer frame 11, while ensuring that the thermal fin module 13 is in full contact with the liquid to achieve sufficient heat conduction between the two, thereby achieving efficient conduction of heat energy.

[0078] The present application also provides a flow heater 20, such as Figure 7 and Figure 8 As shown, it includes a double-chamber thick film heating element 10 as in any of the above examples, so the flow heater 20 has the beneficial effects that can be produced by the double-chamber thick film heating element 10 in the corresponding example, which will not be repeated here.

[0079] It should be understood that the dual-chamber thick film heater 10 and the flow heater 20 provided in the present application are complete devices respectively, and also have the corresponding structures of known devices, which will not be described one by one here.

[0080] For example, the double-chamber thick film heater 10 is further provided with a plurality of pads 123 connected to the heating coil 122 and used for connecting the heating coil 122 to electricity and ground. Figure 7 and Figure 8 As shown, the flow heater 20 can be provided with a shell (e.g., an aluminum alloy shell) 21, a base (e.g., an aluminum alloy base) 22, and a control board 23, wherein the control board 23 includes but is not limited to a PCBA (Printed Circuit Board Assembly), and can be arranged on the base 22, wherein the base 22 is arranged at the bottom of the shell 21, and cooperates with the shell 21 to form a receiving cavity 20a with an upper opening; the control board 23 controls the flow rate of the liquid in each chamber 10b and / or controls the liquid to have a preset temperature when flowing out of the second pipe port 112, thereby the present application can realize liquid flow rate control, liquid preset temperature control, and heating power control; the double-chamber thick film heating element 10 is placed in the receiving cavity 20a from the upper opening, and the top wall of the outer frame 11 extends out of the receiving cavity 10a, and cooperates with the upper opening edge of the shell 21 to seal the receiving cavity 20a.

[0081] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. For ordinary technicians in this field, all equivalent structural changes made using the contents of this specification and drawings are also included in the patent protection scope of the present application.

[0082] Although the terms "first, second", etc. are used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. In addition, the singular forms "one", "an", and "the" are intended to include plural forms as well. The terms "or" and "and / or" are interpreted as inclusive, or mean any one or any combination. Only when the combination of elements, functions, steps, or operations is inherently mutually exclusive in some way, an exception to this definition will occur.

Claims

1. A double-chamber thick film heating element, characterized in that: include: An outer frame is formed to form a frame with openings on two opposite sides; Two heating plates, each of which comprises a substrate and a heating coil, wherein the heating coil is disposed on a first side of the substrate, and the substrates of the two heating plates are respectively welded to opposite sides of the frame to cooperate with the outer frame to form a sealed accommodating cavity; Two heat-conducting fin modules are respectively arranged on the second side surfaces of the substrate of the corresponding heating plate and are heat-conductingly connected to the substrate, and the second side surfaces are arranged opposite to the first side surfaces; The water-blocking plate is arranged in the accommodating cavity and divides the accommodating cavity into two chambers. Each of the heat-conducting fin modules is located in a corresponding chamber.

2. The double-chamber thick film heating element according to claim 1, characterized in that: The heat conducting fin module comprises a first fin, a second fin and a third fin, wherein the first fin and the second fin are arranged opposite to each other along a first direction, and the third fin is arranged between the first fin and the second fin; the first fin is provided with a first channel, the second fin is provided with a second channel, and the third fin is provided with a third channel, and the third channel communicates with the first channel and the second channel; The water blocking plate is provided with a convex strip, one end of which extends to the third fin, and the convex strip is located between the first fin and the second fin to separate the first channel from the second channel.

3. The double-chamber thick film heating element according to claim 2, characterized in that: The outer frame is provided with two pipe openings, and the accommodating cavity is connected with the outside through the two pipe openings; And along the direction parallel to the baffle plate, the two pipe openings do not expose one side edge corresponding to the baffle plate, and one of the pipe openings is connected to the first channel, and the other pipe opening is connected to the second channel.

4. The double-chamber thick film heating element according to claim 3, characterized in that: The water-blocking plate is provided with two air-avoidance areas; The outer frame is provided with two metal cylinders, each of which is connected to the inner wall of the frame and extends to the corresponding air-avoiding area, and one end of the metal cylinder connected to the frame is provided with an opening to allow a temperature sensor to be inserted into the metal cylinder from outside the frame.

5. The double-chamber thick film heating element according to claim 4, characterized in that: Each of the air avoidance areas is arranged adjacent to the corresponding pipe opening.

6. The double-chamber thick film heating element according to claim 4, characterized in that: Along a direction parallel to the baffle, each of the pipe openings exposes a corresponding metal cylinder.

7. The double-chamber thick film heating element according to any one of claims 1 to 6, characterized in that: The edge of the water-blocking plate is welded to the inner wall of the frame so as to be arranged in the accommodating cavity.

8. The double-chamber thick film heating element according to claim 2, characterized in that: Any one of the first fin, the second fin and the third fin comprises a first boss and a second boss arranged alternately and spaced apart, the first boss and the second boss are both hollow inside, and the height of the first boss is greater than the height of the second boss; The first boss and the second boss of the first fin are connected in the second direction to form the first channel, the first boss and the second boss of the second fin are connected in the opposite direction of the second direction to form the second channel, and the first boss and the second boss of the third fin are connected in the first direction to form the third channel, which is used to connect the first channel and the second channel.

9. The double-chamber thick film heating element according to claim 1, characterized in that: The water-blocking plate is an integrally formed plate.

10. A flow heater, characterized in that: The flow heater comprises a double-chamber thick film heater as claimed in any one of claims 1 to 9 above.

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