Electric heater and method of manufacturing the same

Abstract

The application discloses an electric heater, which comprises a shell, a first heating element and a second heating element; the shell comprises a first shell body, a second shell body and a third shell body, the second shell body is connected with the first shell body, the second shell body is connected with the third shell body, and the first shell body and the third shell body are respectively located at different sides of the second shell body in the thickness direction of the second shell body; the first heating element is welded or adhesively fixed with the second shell body, and the second heating element is welded or adhesively fixed with the third shell body; the electric heater has a first flow channel cavity and a second flow channel cavity, the first flow channel cavity is located between the first heating element and the second shell body, and the second flow channel cavity is located between the second heating element and the third shell body. In this way, the sealing performance of the first flow channel cavity and the second flow channel cavity is improved. The application further discloses a manufacturing method of the electric heater.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to an electric heater and a manufacturing method thereof. BACKGROUND

[0002] The electric heater for vehicles comprises a shell, a first heating plate and a second heating plate, the shell comprises an upper shell, a lower shell and a cover plate, the first heating plate is fixed with the upper shell to form a first flow channel cavity, the second heating plate is fixed with the lower shell to form a second flow channel cavity, medium flows in from the upper shell inlet, flows through the first flow channel cavity, enters the second flow channel cavity through the interface, and then flows out from the water outlet of the upper shell. However, the first flow channel cavity and the second flow channel cavity of the existing shell have the problem of poor sealing, which is easy to cause liquid leakage and affect the use effect.

[0003] Therefore, it is necessary to provide an electric heater with good sealing effect and a manufacturing method thereof. SUMMARY

[0004] The purpose of the present application is to provide an electric heater and a manufacturing method thereof, which can improve the sealing of the first flow channel cavity and the second flow channel cavity.

[0005] The purpose of the present application is achieved by the following technical solutions:

[0006] An electric heater comprises a shell, a first heating element and a second heating element, at least part of the first heating element and at least part of the second heating element are located in the shell;

[0007] The shell comprises a first shell, a second shell and a third shell, the second shell is connected with the first shell, the second shell is connected with the third shell, in the thickness direction of the second shell, the first shell and the third shell are located on different sides of the second shell respectively;

[0008] In the thickness direction of the second shell, the first heating element is welded or adhesively fixed with the second shell, in the thickness direction of the third shell, the second heating element is welded or adhesively fixed with the third shell;

[0009] The electric heater has a first flow channel cavity and a second flow channel cavity, the first flow channel cavity is located between the first heating element and the second shell, and the second flow channel cavity is located between the second heating element and the third shell.

[0010] The purpose of the present application is also achieved by the following technical solutions:

[0011] A manufacturing method of an electric heater comprises the following steps:

[0012] The system provides a housing, a first heating element, and a second heating element, wherein the housing includes a first shell, a second shell, and a third shell;

[0013] In the thickness direction of the second housing, the first heating element is welded or bonded to one side wall of the second housing, so that a first flow channel cavity is formed between the first heating element and the second housing;

[0014] In the thickness direction of the third housing, the second heating element is welded or bonded to the third housing to form a second flow channel cavity between the second heating element and the third housing, and then the third housing is connected to one side wall of the second housing;

[0015] Connect the first housing to the other side wall of the second housing.

[0016] This application welds or bonds the first heating element to the second housing and welds or bonds the second heating element to the third housing, which helps to improve the sealing performance of the first flow channel cavity and the second flow channel cavity. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of the electric heater of this application;

[0018] Figure 2 for Figure 1 A schematic diagram of the decomposition process;

[0019] Figure 3 for Figure 1 Another perspective 3D illustration;

[0020] Figure 4 for Figure 3 A schematic diagram of the decomposition process;

[0021] Figure 5 This is a cross-sectional view of the electric heater of this application cut along the second channel;

[0022] Figure 6 This is a cross-sectional view of the electric heater of this application cut along the third channel;

[0023] Figure 7 for Figure 2 A three-dimensional schematic diagram of the second shell in the middle;

[0024] Figure 8 for Figure 2 A three-dimensional schematic diagram of the third shell in the middle;

[0025] Figure 9 This is a projection of the first heating plate and the second heating plate onto a plane.

[0026] Figure 10 for Figure 5Schematic view of the enlarged middle A region;

[0027] Figure 11 Schematic view of the flow direction of the medium in the second housing;

[0028] Figure 12 Schematic view of the flow direction of the medium in the third housing;

[0029] Figure 13 Schematic view of the third housing according to another embodiment of the application;

[0030] Figure 14 Schematic view of the cross section of the first heating plate, the first heating film;

[0031] Figure 15 Schematic view of the cross section of the second heating plate, the second heating film. DETAILED DESCRIPTION

[0032] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. If there are several embodiments, the features in the embodiments can be combined with each other as long as there is no conflict. When the description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise specified. The description in the following exemplary embodiments does not represent all the embodiments consistent with the present application; rather, they are merely examples of devices, products and / or methods consistent with some aspects of the present application as recited in the claims of the present application.

[0033] The terms used in the present application are merely for the purpose of describing the exemplary embodiments and are not intended to limit the scope of the present application. As used in the specification and the claims of the present application, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0034] It should be understood that the use of terms such as "first", "second" and similar terms in the description of the present application and in the claims of the present application do not denote any order, number or importance, but are merely used to identify features. Similarly, the use of "one" or "a" or similar terms does not denote a number restriction, but means that at least one exists. Unless otherwise indicated, the terms "front", "rear", "upper", "lower" and similar terms appearing in the present application are used for the convenience of description only and are not limited to a particular position or a spatial orientation. The terms "include" or "comprise" and similar terms are open-ended expressions that mean the elements listed after the "include" or "comprise" are encompassed, and the elements listed before the "include" or "comprise" can also include other elements. If "several" appears in the present application, it means two or more.

[0035] The electric heater can convert electric energy into heat energy, and is suitable for heating a working medium in a liquid state or a vapor-liquid mixture state. The heating means is to pass electric current to the electric heater, and then make the heating element generate heat and heat the working medium. The electric heater can be used in the technical field of vehicles and the like, and provides heat for the required heat working condition.

[0036] Please refer to Figures 1 to 13 The electric heater disclosed in the present application comprises a shell 1, a first heating element 2, a second heating element 3, and an electric control board 4. At least part of the first heating element 2 and at least part of the second heating element 3 are located in the shell 1. The shell 1 has a first cavity 10a and a second cavity 10b. The electric control board 4 is located in the first cavity 10a, and at least part of the first heating element 2 and at least part of the second heating element 3 are located in the second cavity 10b.

[0037] Please refer to Figure 2 The shell 1 comprises a first shell 11, a second shell 12, and a third shell 13. The second shell 12 is connected to the first shell 11, and the second shell 12 is connected to the third shell 13. In the thickness direction of the second shell 12, the first shell 11 and the third shell 13 are located on different sides of the second shell 12, respectively. The first shell 11, the second shell 12, and the third shell 13 can be pressed and formed by using a metal material, and have the functions of supporting and protecting. For example, the first shell 11, the second shell 12, and the third shell 13 can be pressed and formed by using aluminum material. The second shell 12 and the third shell 13 are sealed and fixed by a sealing ring 5. In the embodiment shown in the present application, please refer to Figure 7 and Figure 8 The second shell 12 has a first sealing groove 120, and the third shell 13 has a second sealing groove 130. The sealing ring 5 is installed in the first sealing groove 120 and the second sealing groove 130, so as to improve the sealing performance between the second shell 12 and the third shell 13. Of course, in other embodiments, the first shell 11 and the second shell 12 can also be sealed and fixed by a sealing ring.

[0038] In the thickness direction of the second shell 12, the first heating element 2 is welded or bonded to the second shell 12. In the thickness direction of the third shell 13, the second heating element 3 is welded or bonded to the third shell 13.

[0039] Please refer to Figure 2 The second shell 12 comprises a first wall portion 121 and a first peripheral wall 122 extending perpendicularly from the first wall portion 121. The first shell 11 and the third shell 13 are located on different sides of the first wall portion 121 in the thickness direction. The first shell 11 and the first peripheral wall 122 are located on the periphery of the first cavity 10a, and the third shell 13 is located on the periphery of the second cavity 10b. Please refer to Figure 2 and Figure 4The first wall portion 121 comprises a first side surface 121a and a second side surface 121b located at opposite sides in the thickness direction of the first wall portion 121, the first side surface 121a is located in the first cavity 10a, and the second side surface 121b is located in the second cavity 10b. The first shell 11 is connected with the first peripheral wall 122.

[0040] In the embodiment shown in the present application, the first heating element 2 and the second heating element 3 are spaced between the first wall portion 121 and the third shell 13. The second side surface 121b faces the first heating element 2, and the second heating element 3 is closer to the third shell 13 than the first heating element 2.

[0041] Referring to Figure 4 The first shell 11 comprises a second wall portion 111 and a second peripheral wall 112 extending perpendicularly from the second wall portion 111. The second peripheral wall 112 is fixedly connected with the first peripheral wall 122.

[0042] Referring to Figure 5 The electric heater has a first flow channel cavity 101 and a second flow channel cavity 102, the first flow channel cavity 101 and the second flow channel cavity 102 are capable of being communicated, and the first flow channel cavity 101 and the second flow channel cavity 102 are both located between the second shell 12 and the third shell 13. The first flow channel cavity 101 is located between the first heating element 2 and the second shell 12, and the second flow channel cavity 102 is located between the second heating element 3 and the third shell 13.

[0043] The first wall portion 121 and the first heating element 2 are located at the periphery of the first flow channel cavity 101, the second heating element 3 and the third shell 13 are located at the periphery of the second flow channel cavity 102, and at least one of the first flow channel cavity 101 and the second flow channel cavity 102 provides a curved flow path for the medium, which is beneficial to increase the flow path of the medium, prolong the heating time, enable the medium to absorb sufficient heat, and improve the heating efficiency.

[0044] In some embodiments, referring to Figure 4 The first wall portion 121 has a first flow channel groove 1211, the first flow channel groove 1211 at least partially constitutes the first flow channel cavity 101, and the opening of the first flow channel groove 1211 in the thickness direction of the first wall portion 121 faces the first heating element 2. The first wall portion 121 has a first mounting groove 1212, the first mounting groove 1212 is communicated with the first flow channel groove 1211, and the first heating element 2 is mounted in the first mounting groove 1212. The first flow channel groove 1211 is arranged on the first wall portion 121, so that the first heating element 2 and the first wall portion 121 enclose the first flow channel cavity 101. During operation, the medium in the first flow channel cavity 101 is heated by the first heating element 2, and the medium supplies heat to the required heat working condition.

[0045] Referring to Figure 4The first wall portion 121 includes a first slot wall 1201, a second slot wall 1202 opposite the first slot wall 1201, a first connecting wall 1203 connecting one end of the first slot wall 1201 and one end of the second slot wall 1202, and a second connecting wall 1204 connecting the other end of the first slot wall 1201 and the other end of the second slot wall 1202. At least part of the walls of the first slot wall 1201, the second slot wall 1202, the first connecting wall 1203, and the second connecting wall 1204 form the slot walls of the first flow channel slot 1211. The first slot wall 1201, the second slot wall 1202, the first connecting wall 1203, and the second connecting wall 1204 collectively constitute the peripheral wall surface of the first flow channel slot 1211, and the peripheral wall surface of the first mounting slot 1212 is located outside the peripheral wall surface of the first flow channel slot 1211. The first connecting wall 1203 and the second connecting wall 1204 are both flat surfaces, and the first connecting wall 1203 is parallel to the second connecting wall 1204.

[0046] In the embodiment shown in the present application, referring to Figure 4 The first slot wall 1201 includes a first curved wall 120a protruding towards the second slot wall 1202, and the second slot wall 1202 includes a second curved wall 120b protruding towards the first slot wall 1201. The first curved wall 120a and the second curved wall 120b make the curved flow path S-shaped. Of course, in other embodiments, the first slot wall 1201 can only include a first curved wall 120a protruding towards the second slot wall 1202, and the first curved wall 120a makes the curved flow path C-shaped.

[0047] In particular, referring to Figure 7 The first curved wall 120a includes a first flat wall 1001, a second flat wall 1002 parallel to the first flat wall 1001, and a first arc-shaped wall 1003 connecting the first flat wall 1001 and the second flat wall 1002. The first flat wall 1001, the second flat wall 1002, and the first connecting wall 1203 are parallel to each other. The second curved wall 120b includes a fifth flat wall 1004, a sixth flat wall 1005 parallel to the fifth flat wall 1004, and a third arc-shaped wall 1006 connecting the fifth flat wall 1004 and the sixth flat wall 1005. The fifth flat wall 1004, the sixth flat wall 1005, and the first connecting wall 1203 are parallel to each other.

[0048] In some embodiments, referring to Figure 2The third shell 13 has a second flow channel groove 131 which at least partially forms the second flow channel cavity 102. The second flow channel groove 131 has an opening in the thickness direction of the third shell 13, which is parallel to the thickness direction of the first wall portion 121. The third shell 13 has a second mounting groove 132 which is in communication with the second flow channel groove 131. The second heating element 3 is mounted in the second mounting groove 132. The second flow channel groove 131 is formed in the third shell 13, so that the second heating element 3 and the third shell 13 form the second flow channel cavity 102. In operation, the second heating element 3 heats the medium in the second flow channel cavity 102, and the medium supplies heat to the working condition requiring heat.

[0049] Referring to Figure 7 and Figure 8 The first heating plate 21 is welded or adhesively fixed to the first groove bottom surface 3001 of the first mounting groove 1212, and the second heating plate 31 is welded or adhesively fixed to the second groove bottom surface 3002 of the second mounting groove 132. The first flow channel groove 1211 is recessed in the first groove bottom surface 3001, and the second flow channel groove 131 is recessed in the second groove bottom surface 3002.

[0050] Continuing to refer to Figure 2 The third shell 13 includes a third groove wall 1301, a fourth groove wall 1302 opposite to the third groove wall 1301, a third connecting wall 1303 connecting one end of the third groove wall 1301 and one end of the fourth groove wall 1302, and a fourth connecting wall 1304 connecting the other end of the third groove wall 1301 and the other end of the fourth groove wall 1302. The third groove wall 1301, the fourth groove wall 1302, the third connecting wall 1303, and the fourth connecting wall 1304 are located at the periphery of the second flow channel groove 131. The third groove wall 1301, the fourth groove wall 1302, the third connecting wall 1303, and the fourth connecting wall 1304 collectively form the peripheral wall surface of the second flow channel groove 131, and the peripheral wall surface of the second mounting groove 132 is located at the outer ring of the peripheral wall surface of the second flow channel groove 131. Among them, the third connecting wall 1303 and the fourth connecting wall 1304 are both flat wall surfaces, and the third connecting wall 1303 is parallel to the fourth connecting wall 1304.

[0051] In the embodiment shown in the present application, continuing to refer to Figure 2 The third groove wall 1301 includes a third curved wall 130a protruding towards the fourth groove wall 1302, and the third curved wall 130a makes the curved flow path have a C shape. Of course, in other embodiments, such as Figure 13As shown, the third slot wall 1301 comprises a third curved wall 130a protruding towards the fourth slot wall 1302, the fourth slot wall 1302 comprises a fourth curved wall 130b protruding towards the third slot wall 1301, and the third curved wall 130a and the fourth curved wall 130b make the curved flow path S-shaped.

[0052] Specifically, referring to Figure 8 , the third curved wall 130a comprises a third straight wall 2001, a fourth straight wall 2002 parallel to the third straight wall 2001, and a second arc-shaped wall 2003 connecting the third straight wall 2001 and the fourth straight wall 2002, and the third straight wall 2001, the fourth straight wall 2002 and the third connecting wall 1303 are parallel to each other.

[0053] Referring to Figure 1 , the second housing 12 is provided with a first hole passage component 123 and a second hole passage component 124, both of which are arranged on the first peripheral wall 122. The first hole passage component 123 has a first hole passage 1230, and the second hole passage component 124 has a second hole passage 1240. Referring to Figure 5 and Figure 6 , the shell 1 comprises a first channel 103, a second channel 104 and a third channel 105, the first channel 103 connects the first flow passage cavity 101 and the first hole passage 1230, the second channel 104 connects the second flow passage cavity 102 and the second hole passage 1240, and the third channel 105 connects the first flow passage cavity 101 and the second flow passage cavity 102.

[0054] In the embodiment shown in the application, the first hole passage 1230 is a medium inlet, the second hole passage 1240 is a medium outlet, and the first channel 103 is arranged on the first wall portion 121. Referring to Figure 5 and Figure 6 , the first wall portion 121 has a first wall portion channel 1041 and a second wall portion channel 1051, the third housing 13 has a first housing channel 1042 and a second housing channel 1052, the first housing channel 1042 is in communication with the second flow passage cavity 102, the first wall portion channel 1041 is in communication with the first housing channel 1042, and the first wall portion channel 1041 is in communication with the second hole passage 1240. The first flow passage cavity 101 is in communication with the second wall portion channel 1051, the second wall portion channel 1051 is in communication with the second housing channel 1052, and the second housing channel 1052 is in communication with the second flow passage cavity 102, so as to realize the communication between the first flow passage cavity 101 and the second flow passage cavity 102. The first wall portion channel 1041 and the first housing channel 1042 jointly constitute the second channel 104. The second wall portion channel 1051 and the second housing channel 1052 jointly constitute the third channel 105.

[0055] Referring to Figure 2 and Figure 4, the first heating element 2 comprises a first heating plate 21 and a first wiring part 22 connected with the first heating plate 21, the second heating element 3 comprises a second heating plate 31 and a second wiring part 32 connected with the second heating plate 31, the first heating plate 21 is welded or fixed with the first wall part 121, the second heating plate 31 is welded or fixedly bonded with the third shell 13, which is beneficial to improve the sealing performance of the first flow channel cavity 101 and the second flow channel cavity 102. Referring to Figure 10 , the first heating plate 21 comprises a first surface 21a and a second surface 21b located on opposite sides in the thickness direction, and the second heating plate 31 comprises a third surface 31a and a fourth surface 31b located on opposite sides in the thickness direction. The first spacing H1 is provided between the second surface 21b and the third surface 31a.

[0056] Continuing to refer to Figure 10 , the first wall part 121 comprises a first bottom wall 1205 located at the periphery of the first flow channel groove 1211, and the third shell 13 comprises a second bottom wall 133 located at the periphery of the second flow channel groove 131, the first bottom wall 1205 is opposite to the first surface 21a, and the second bottom wall 133 is opposite to the fourth surface 31b. The second spacing H2 is provided between the first bottom wall 1205 and the first surface 21a, and the third spacing H3 is provided between the second bottom wall 133 and the fourth surface 31b. In the embodiment shown in the application, the second spacing H2 is equal to the third spacing H3, and the first spacing H1 is smaller than the second spacing H2 and the third spacing H3.

[0057] Referring to Figure 14 and Figure 15 , the first heating element 2 comprises a first heating film 23 connected with the second surface 21b, and the second heating element 3 comprises a second heating film 33 connected with the third surface 31a. The first heating film 23 is arranged opposite to the second heating film 33. Specifically, the first wiring part 22 is connected with the first heating film 23, and the second wiring part 32 is connected with the second heating film 33.

[0058] Referring to Figure 7 , the first wall part 121 is provided with a first through hole 1213 and a second through hole 1214, both of which are in communication with the first cavity 10a. The first wiring part 22 is connected with a first cable, and the first cable can pass through the first through hole 1213 to be connected with the electric control panel 4. The second wiring part 32 is connected with a second cable, and the second cable can pass through the second through hole 1214 to be connected with the electric control panel 4. The first through hole 1213 and the second through hole 1214 are in communication with the first mounting groove 1212.

[0059] In the application, referring to Figure 9The first heating plate 21 has a first projection S1 on the middle plane M of the electric heater, the second heating plate 31 has a second projection S2 on the middle plane M of the electric heater, the first projection S1 coincides with the second projection S2, and the first heating plate 21 and the second heating plate 31 are parallel to the middle plane M. That is, the first heating plate 21 and the second heating plate 31 have the same structure, which reduces a set of heating plate manufacturing molds and reduces costs.

[0060] The electric control board 4 is located between the first shell 11 and the second shell 12, and the first wiring part 22 and the second wiring part 32 are electrically connected with the electric control board 4. Referring to Figure 2 The electric heater comprises an electric connector 6 electrically connected with the electric control board 4, and the electric connector 6 is used for being connected with a mating connector connected with a power supply, so as to realize power supply to the electric heater.

[0061] In operation, the medium sequentially enters the first channel 103, the first flow cavity 101 from the first hole 1230, the first heating plate 21 heats the medium flowing through the first flow cavity 101, the heated medium enters the second flow cavity 102 through the third channel 105, the second heating plate 31 heats the medium flowing through the second flow cavity 102 again, the heated medium enters the second hole 1240 through the second channel 104, and flows to a heating device for heat exchange, and the cooled medium enters the first hole 1230 again to form a circulation.

[0062] The application further discloses a manufacturing method of the electric heater, comprising the following steps:

[0063] In the thickness direction of the second shell 12, the first heating element 2 is welded or bonded with a side wall of the second shell 12, so that the first flow cavity 101 is formed between the first heating element 2 and the second shell 12;

[0064] In the thickness direction of the third shell 13, the second heating element 3 is welded or bonded with the third shell 13, so that the second flow cavity 102 is formed between the second heating element 3 and the third shell 13, and then the third shell 13 is connected with a side wall of the second shell 12;

[0065] The first shell 11 is connected with the other side wall of the second shell 12.

[0066] The first shell 11 is connected with the other side wall of the second shell 12 before the first heating element 2 is connected with the second shell 12; or

[0067] The first shell 11 is connected with the other side wall of the second shell 12 after the first heating element 2 is connected with the second shell 12 and before the second shell 12 is connected with the third shell 13; or

[0068] After the first heating element 2 is connected to the second shell 12, the second shell 12 is connected to the third shell 13, and then the first shell 11 is connected to the other side wall of the second shell 12.

[0069] Specifically, the first heating element 2 is installed in the first installation groove 1212 of the second shell 12, the two surfaces in contact between the first heating element 2 and the second shell 12 are welded or adhesively fixed, and the opening of the first flow channel groove 1211 is sealed by the first heating element 2, thereby forming the first flow channel cavity 101 between the second shell 12 and the first heating element 2. The first heating film 23 of the first heating element 2 is located outside the first flow channel cavity 101.

[0070] The second heating element 3 is installed in the second installation groove 132 of the third shell 13, the two surfaces in contact between the second heating element 3 and the third shell 13 are welded or adhesively fixed, and the opening of the second flow channel groove 131 is sealed by the second heating element 3, thereby forming the second flow channel cavity 102 between the third shell 13 and the second heating element 3. The second heating film 33 of the second heating element 3 is located outside the second flow channel cavity 102.

[0071] The third shell 13 is fixed to one side of the second shell 12, the sealing ring 5 is pressed between the third shell 13 and the second shell 12, the electric control panel 4 is installed in the space surrounded by the first wall 121 and the first peripheral wall 122, and the other side of the first shell 11 and the second shell 12 is adhesively fixed, thereby forming the first cavity 10a between the first shell 11 and the second shell 12.

[0072] In summary, compared with the prior art, the electric heater of the present application has the following advantages:

[0073] 1. By providing the first flow channel cavity 101 and the second flow channel cavity 102, the first heating plate 21 initially heats the medium in the first flow channel cavity 101, the medium flows from the first flow channel cavity 101 to the second flow channel cavity 102, and the second heating plate 31 re-heats the medium in the second flow channel cavity 102. At least one of the first flow channel cavity 101 and the second flow channel cavity 102 provides a curved flow path for the medium, which is beneficial to increase the flow path of the medium, prolong the heating time, and improve the heating effect.

[0074] 2. The first heating plate 21 is welded or adhesively fixed to the first wall 121, and the second heating plate 31 is welded or adhesively fixed to the third shell 13, which is beneficial to improve the sealing performance of the first flow channel cavity 101 and the second flow channel cavity 102.

[0075] 3. The support between the first heating plate 21 and the second heating plate 31 is cancelled, the structure is more compact, the volume is small, and the weight is light.

[0076] 4. The first heating plate 21 and the second heating plate 31 adopt the same structure, so that a set of heating plate manufacturing molds is reduced, and the cost is reduced.

[0077] The above embodiments are only used for illustrating the present application and not limiting the technical solutions described in the present application. The understanding of the specification should be based on the skilled in the art. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the skilled in the art can still modify or equivalently replace the present application, and all technical solutions and improvements which do not deviate from the spirit and scope of the present application should be covered in the scope of claims of the present application.

Claims

1. An electric heater, characterized in that, It includes a housing (1), a first heating element (2) and a second heating element (3), wherein at least a portion of the first heating element (2) and at least a portion of the second heating element (3) are located inside the housing (1); The outer shell (1) includes a first shell (11), a second shell (12) and a third shell (13). The second shell (12) is connected to the first shell (11) and the second shell (12) is connected to the third shell (13). In the thickness direction of the second shell (12), the first shell (11) and the third shell (13) are located on different sides of the second shell (12). In the thickness direction of the second housing (12), the first heating element (2) is welded or bonded to the second housing (12), and in the thickness direction of the third housing (13), the second heating element (3) is welded or bonded to the third housing (13). The electric heater has a first flow channel cavity (101) and a second flow channel cavity (102). The first flow channel cavity (101) is located between the first heating element (2) and the second housing (12). The second flow channel cavity (102) is located between the second heating element (3) and the third housing (13). The first heating element (2) includes a first wiring portion (22). The second heating element (3) includes a second wiring portion (32). The first wiring portion (22) is connected to a first cable. The second wiring portion (32) is connected to a second cable. The first heating element (2) and the second heating element (3) are arranged opposite to each other and are located together between the first flow channel cavity (101) and the second flow channel cavity (102).

2. The electric heater according to claim 1, characterized in that, The second housing (12) includes a first wall portion (121), the first wall portion (121) has a first mounting groove (1212), the first heating element (2) is mounted in the first mounting groove (1212), the first heating element (2) includes a first heating plate (21), the first heating plate (21) is welded or bonded to the bottom surface (3001) of the first groove of the first mounting groove (1212).

3. The electric heater according to claim 2, characterized in that, The first wall portion (121) has a first flow channel groove (1211), the first flow channel groove (1211) is recessed on the bottom surface (3001) of the first channel, and the first flow channel groove (1211) at least partially constitutes the first flow channel cavity (101).

4. The electric heater according to claim 2, characterized in that, The third housing (13) has a second mounting groove (132), and the second heating element (3) is mounted in the second mounting groove (132). The second heating element (3) includes a second heating plate (31), and the second heating plate (31) is welded or bonded to the bottom surface (3002) of the second groove of the second mounting groove (132).

5. The electric heater according to claim 4, characterized in that, The third housing (13) has a second flow channel groove (131), which is recessed on the bottom surface (3002) of the second channel, and the second flow channel groove (131) at least partially constitutes the second flow channel cavity (102).

6. The electric heater according to claim 2, characterized in that, The second housing (12) includes a first peripheral wall (122) connected to the first wall portion (121), and the first housing (11) includes a second wall portion (111) and a second peripheral wall (112) connected to the second wall portion (111), wherein the second peripheral wall (112) is connected to the first peripheral wall (122).

7. The electric heater according to claim 4, characterized in that, The first heating element (2) includes a first heating film (23), and the first heating plate (21) is connected to the first heating film (23). The second heating element (3) includes a second heating film (33), and the second heating plate (31) is connected to the second heating film (33). The first heating film (23) and the second heating film (33) are arranged opposite to each other.

8. The electric heater according to claim 7, characterized in that, The first wiring part (22) is connected to the first heating film (23), and the second wiring part (32) is connected to the second heating film (33); The outer shell (1) has a first cavity (10a) located between the first wall portion (121) and the second shell (12), and the electric heater includes an electric control board (4) located in the first cavity (10a). The first wall portion (121) is provided with a first through hole (1213) and a second through hole (1214). Both the first through hole (1213) and the second through hole (1214) are connected to the first cavity (10a). The first cable can pass through the first through hole (1213) and connect to the electronic control board (4). The second cable can pass through the second through hole (1214) and connect to the electronic control board (4).

9. A method for manufacturing an electric heater, characterized in that, Includes the following steps: Provided housing (1), first heating element (2) and second heating element (3), the housing (1) includes first shell (11), second shell (12) and third shell (13); In the thickness direction of the second housing (12), the first heating element (2) is welded or bonded to one side wall of the second housing (12) to form a first flow channel cavity (101) between the first heating element (2) and the second housing (12). In the thickness direction of the third housing (13), the second heating element (3) is welded or bonded to the third housing (13) to form a second flow channel cavity (102) between the second heating element (3) and the third housing (13), and then the third housing (13) is connected to one side wall of the second housing (12); Connect the first housing (11) to the other side wall of the second housing (12); The first heating element (2) includes a first wiring portion (22), and the second heating element (3) includes a second wiring portion (32). The first wiring portion (22) is connected to a first cable, and the second wiring portion (32) is connected to a second cable. The first heating element (2) and the second heating element (3) are arranged opposite to each other and are located together between the first flow channel cavity (101) and the second flow channel cavity (102).

10. The method for manufacturing an electric heater according to claim 9, characterized in that, Before the first heating element (2) is connected to the second housing (12), the first housing (11) is connected to the other side wall of the second housing (12); or After the first heating element (2) is connected to the second housing (12) and before the second housing (12) is connected to the third housing (13), the first housing (11) is connected to the other side wall of the second housing (12); or After the first heating element (2) is connected to the second housing (12), and after the second housing (12) is connected to the third housing (13), the first housing (11) is connected to the other side wall of the second housing (12).

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