CN108266887B

CN108266887B - Electric heater

Info

Publication number: CN108266887B
Application number: CN201710228835.6A
Authority: CN
Inventors: 韩锐
Original assignee: Hangzhou Sanhua Research Institute Co Ltd
Current assignee: Hangzhou Sanhua Research Institute Co Ltd
Priority date: 2016-12-30
Filing date: 2017-04-10
Publication date: 2021-04-20
Anticipated expiration: 2037-04-10
Also published as: CN108266887A

Abstract

The invention discloses an electric heater, which comprises an electric heating pipe, a shell and a mounting plate, wherein the shell comprises a peripheral wall and an isolating part, the isolating part is positioned at the inner side of the peripheral wall, and the isolating part and the peripheral wall of the shell are fixedly arranged; the isolation component is provided with a first side part and a second side part which are oppositely arranged, the first side part is provided with a groove, and one part of the electric heating pipe is positioned in the groove; the second side part of the isolation component, the mounting plate and the peripheral wall of the shell positioned between the mounting plate and the second side part are part of wall parts forming a fluid cavity, the fluid cavity is positioned between the heating tube cavity and the mounting cavity, the fluid cavity and the heating tube cavity are separated through the isolation component, and the fluid cavity and the mounting cavity are separated through the mounting plate; the electric heater comprises a support and a temperature fuse fixedly arranged with the support, the support is fixedly arranged with the electric heating tube or is arranged in contact with the electric heating tube, and the temperature fuse is connected with a circuit of the electric heating tube in series. The electric heater has high safety and long service life.

Description

Electric heater

The present application claims priority from chinese patent application filed on 30/12/2016 under the name of chinese patent office, application number 201611259684.2, entitled "electric heater," the entire contents of which are incorporated herein by reference.

Technical Field

The invention relates to the technical field of electric heaters, in particular to an electric heater.

Background

The new energy automobile mostly adopts an electric heating mode to heat the cockpit, so as to accord with the zero emission concept.

At present, one of the electric heaters commonly used is a metal tube electric heater, which directly immerses an electric heating tube in a cooling liquid to generate heat by electrifying. Although the metal tube electric heater has high heat efficiency and quick heating, the cooling liquid usually contains glycol, which has weak acidity and certain corrosivity to the metal tube, so that the metal tube electric heater has safety risk; the metal pipe is in direct contact with the cooling liquid, and once the metal pipe has cracks, the cooling liquid is electrified, so that the metal pipe is dangerous; in addition, without the coolant, the electric heater presents a serious safety problem if it is dry-fired.

Therefore, how to design an electric heater with high safety is a technical problem that needs to be solved by those skilled in the art at present.

Disclosure of Invention

The object of the present invention is to provide an electric heater which is highly safe.

In order to solve the technical problem, the invention provides an electric heater, which comprises an electric heating pipe, a shell and a mounting plate, wherein the shell comprises a shell peripheral wall and an isolation component, the isolation component is positioned on the inner side of the shell peripheral wall, and the isolation component and the shell peripheral wall are fixedly arranged; the isolation component is provided with a first side part and a second side part which are oppositely arranged, the first side part is provided with a groove, and at least part of the electric heating pipe is positioned in the groove;

the electric heater comprises a heating tube cavity, a mounting cavity and a fluid cavity, wherein the second side part of the isolation component, the mounting plate and the peripheral wall of the shell positioned between the second side part and the mounting plate are at least part of the wall part forming the fluid cavity;

the electric heater comprises a support and a temperature fuse fixedly arranged on the support, the support is fixedly arranged or in contact with the electric heating pipe, the support is in contact with the electric heating pipe, and the temperature fuse is connected with a circuit of the electric heating pipe in series.

The electric heater provided by the technical scheme is provided with the shell, the shell is provided with the heating tube cavity, the fluid cavity and the mounting cavity, and the fluid cavity is positioned between the heating tube cavity and the mounting cavity, so that the electric heating tube cannot be directly contacted with fluid through the separation of the separation part, the potential safety hazards of electric leakage or corrosion and the like caused by directly inserting the electric heating tube into the fluid in the prior art are avoided, and the safety and the reliability of the electric heater are improved; in addition, be equipped with temperature fuse and support in the heating pipe intracavity, when electric heater dry combustion method, electric heating pipe's surface temperature can rise fast, and the heat passes through support transmission to temperature fuse from the surface, and after the temperature exceeded the settlement temperature of temperature fuse, temperature fuse can fuse, and the cutting off circuit prevents electric heater because of the incident such as firing that the dry combustion method leads to, has further improved electric heater's security and reliability.

Drawings

FIG. 1 is a schematic structural view of an electric heater according to a first embodiment of the present invention;

FIG. 2 is a schematic view of the electric heater of FIG. 1 with the cover removed;

FIG. 3 is a schematic structural view of a housing of the electric heater of FIG. 1;

FIG. 4 is a schematic view of another angle of the housing of the electric heater of FIG. 1;

FIG. 5 is a cross-sectional view of the housing shown in FIG. 3;

FIG. 6 is a schematic structural view of an electric heating tube of the electric heater in an embodiment;

fig. 7 is a schematic structural view of the electric heating pipe of the first embodiment after being assembled with a housing frame;

FIGS. 8 and 9 are schematic views showing front and back structures of a mounting plate of an electric heater in an exemplary embodiment, respectively;

FIG. 10 is a schematic structural view of the first embodiment after the mounting plate and the housing frame are assembled;

FIG. 11 is a schematic structural view of an electric heater according to a second embodiment of the present invention;

FIG. 12 is a schematic view of the electric heater of FIG. 11 with the first cover removed;

FIG. 13 is a schematic view of a first housing of the electric heater of FIG. 11;

FIG. 14 is a schematic view of the first housing of the electric heater of FIG. 11 at another angle;

FIG. 15 is a cross-sectional view of the first housing shown in FIG. 13;

fig. 16 is a schematic structural view of the electric heating pipe of the second embodiment after being assembled with the first housing;

FIG. 17 is a schematic structural view of a second housing of the electric heater of FIG. 11;

FIG. 18 is a schematic view of an alternative angle of the second housing of the electric heater of FIG. 11;

fig. 19 is an assembly view of the first housing and the second housing of the second embodiment;

FIG. 20 shows a dry-fire protection arrangement for an electric heater in an exemplary embodiment;

FIG. 21 is an enlarged view of a portion of the connection portion of the holder and the electric heating tube in FIG. 20;

fig. 22 is a circuit diagram showing the connection between the electric heating tube and the thermal fuse.

Description of reference numerals:

the housing 1, the housing frame 11, the partition member 12, the groove 121, the groove wall 122, the fins 123, the reinforcing ribs 124, the partition plate 125, the first side portion 126, the second side portion 127, the side partition wall 13, the end partition wall 14, the cover plate 15, the through-hole 16, the fluid inlet 17, the fluid outlet 18;

the mounting plate 2, the convex part 21, the protruding part 22, the boss 23, the strip-shaped protrusion 24 and the protruding part 241;

a fluid chamber 111;

the housing 1', the first housing 11a, the partition member 12a, the groove 121a, the groove wall 122a, the fin 123a, the reinforcing rib 124a, the partition plate 125a, the first side 126a, the second side 127a, the fixing groove 128a, the first cover plate 15a, the first through hole 16a, the fluid inlet 17a, the fluid outlet 18a, the first mounting seat plate 19 a;

a second housing 11b, a second cover plate 15b, a second through hole 16b, a second mounting seat plate 19b, a mounting plate 2b, a convex portion 21b, a protrusion 22b, a boss 23b, a strip-shaped protrusion 24b, and a protrusion 241 b;

a seal ring 100; a first space 110a, a second space 110b, a fluid chamber 111 a;

the electric heating tube 3, the straight part 31, the tilting part 32, the circuit control board 4, the IGBT5, the strong electric connector 6, the weak electric connector 7, the inlet connecting tube 8 and the outlet connecting tube 9;

bracket 201, extension 2011, lath 2012, thermal fuse 202.

Detailed Description

In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1 to 10, fig. 1 is a schematic structural diagram of an electric heater according to a first embodiment of the present invention; FIG. 2 is a schematic view of the electric heater of FIG. 1 with the upper cover removed; FIG. 3 is a schematic structural view of a housing of the electric heater of FIG. 1; FIG. 4 is a schematic view of another angle of the housing of the electric heater of FIG. 1; FIG. 5 is a cross-sectional view of the housing shown in FIG. 3; FIG. 6 is a schematic structural view of an electric heating tube of the electric heater in an embodiment; fig. 7 is a schematic structural view of the electric heating pipe of the first embodiment after being assembled with a housing frame; FIGS. 8 and 9 are schematic views showing front and back structures of a mounting plate of an electric heater in an exemplary embodiment, respectively; fig. 10 is a structural view of the mounting plate and the housing frame of the first embodiment after assembly.

In the present embodiment, the electric heater includes a case 1 and a mounting plate 2; the housing 1 includes a housing frame 11, the housing frame 11 includes a peripheral wall and an isolation member 12, the peripheral wall and the isolation member are integrally disposed, the isolation member 12 is located inside the peripheral wall, the isolation member 12 is fixedly disposed on the peripheral wall of the housing, the isolation member 12 has a first side portion 126 and a second side portion 127 which are disposed oppositely, the first side portion 126 of the isolation member 12 is provided with a groove 121, and at least a portion of the electric heating tube 3 is located in the groove. The electric heater further comprises a fluid inlet 17, a fluid outlet 18 and a fluid chamber 111, the mounting plate 2, the second side 127 of the partition member 12 and the peripheral wall of the housing frame therebetween being at least a part of the wall forming the fluid chamber 111. The fluid inlet 17 and the fluid outlet 18 communicate with the fluid chamber 111.

In a specific embodiment, two or more grooves 121 may be provided on the first side portion 126 of the isolation component 12, and more specifically, the grooves 121 are arranged in parallel with each other, the illustrated embodiment exemplarily shows a structure that the first side portion 126 of the isolation component 12 is provided with three parallel grooves 121, and it is understood that the number of the grooves 121 may be set according to the requirement, for example, four, five or more grooves may be provided, and is not limited to the example in the drawings.

Accordingly, the second side portion 127 of the partition member 12 has a groove wall 122 provided to project toward the fluid chamber 111, that is, the groove 121 is formed by recessing the first side portion 126 of the partition member 12 while the recessed portion projects, and the groove wall 122 is formed at the second side portion 127 of the partition member 12. Specifically, two or more groove walls 122 are provided.

The mounting plate 2 is located on the side of the second side 127 of the isolation component 12, that is, the mounting plate 2 is located on the same side as the groove wall 122, and the mounting plate 2 is fixedly arranged with the peripheral wall of the housing and/or the isolation component; it is apparent that the mounting plate 2 is spaced apart from the partition member 12 to ensure a certain space for the fluid chamber 111.

The electric heater provided by the embodiment is provided with a shell 1, a groove 121 is formed on a first side part of an isolation component 12 for installing an electric heating tube 3, a mounting plate 2 is arranged on one side of a second side part of the isolation component 12, the mounting plate 2, the isolation component 12 and a peripheral wall of the shell positioned between the mounting plate 2 and the isolation component 12 are at least a part of a wall part for forming a fluid cavity 111, and a fluid inlet 17 and a fluid outlet 18 are formed on the peripheral wall for forming the fluid cavity 111; therefore, the electric heating pipe 3 is prevented from being in direct contact with the fluid through the separation of the isolation component 12, potential safety hazards such as electric leakage or corrosion caused by the fact that the electric heating pipe 3 is directly inserted into the fluid in the prior art are avoided, and the safety and the reliability of the electric heater are improved; in addition, a groove 121 for installing the electric heating tube 3 is opened on one side of the isolation member 12, and a groove wall 122 formed on the other side of the isolation member 12 is a part of a wall part forming the fluid chamber 111, so that heat generated by the electric heating tube 3 is transferred to fluid in the fluid chamber 111 through the isolation member 12, and the thermal efficiency is high.

In a specific scheme, the electric heater further comprises a circuit control board 4, the circuit control board 4 is installed on the outer surface of the mounting plate 2, and the circuit control board 4 is used for being electrically connected with the electric heating tube 3 so as to control the on-off of the electric heating tube 3. It is to be noted here that the inner surface of the mounting plate 2 refers to the side facing the slot wall 122, and correspondingly, the outer surface refers to the side facing away from the slot wall 122.

Thus, after the electric heating tube 3 is powered on, the generated heat is transferred to the fluid in the fluid chamber 111 through the slot wall 122.

After the above arrangement, the electric heater may be applied to a new energy automobile, wherein the circuit control board 4 may be a circuit control board of the vehicle.

It can be understood that, by the above arrangement, the electric heater has a heating tube cavity (a cavity body where the electric heating tube 3 is installed), a fluid cavity and a mounting cavity (a cavity body where the circuit control board 4 is installed), wherein the fluid cavity is located between the heating tube cavity and the mounting cavity, the fluid cavity and the heating tube cavity are separated by the isolation component 12, and the fluid cavity and the mounting cavity are separated by the mounting plate 2. The separation of the fluid cavity and the heating tube cavity by the separation component comprises direct separation and indirect separation, namely the separation component and the fluid cavity and the heating tube cavity have other components.

In a specific embodiment, the isolation component 12 has a through hole 16, and the through hole 16 penetrates through the first side portion 126 and the second side portion 127 of the isolation component 12, so that a lead connected to the electric heating tube 3 can pass through the through hole 16 to be connected to the circuit control board 4, thereby facilitating wiring.

Specifically, a reinforcing rib 124 is provided on the groove wall 122, the reinforcing rib 124 being provided along the longitudinal direction of the groove wall 122, the provision of the reinforcing rib 124 contributing to an increase in the strength of the groove wall 12; specifically, fins 123 are provided on the groove wall 122, the fins 123 are arranged along the longitudinal direction of the groove wall 122, and the fins 123 are distributed on both sides of the reinforcing rib 124.

As described above, the fins 123 and the reinforcing ribs 124 are provided to help the heat dissipation of the electric heating tube 3 and prolong the service life, and on the other hand, the fins 123 and the reinforcing ribs 124 also have a reinforcing effect to improve the strength of the slot walls 122, so that the slot walls 122 themselves can be made thinner, thereby reducing the heat transfer resistance of the electric heating tube 3.

Referring to fig. 6, in a specific embodiment, the cross-sectional shape of the electric heating tube 3 is matched with the cross-sectional shape of the groove 121, so that when the electric heating tube 3 is installed in the groove 121, the bottom surface and the two surfaces thereof can be well attached to the inner wall surface of the groove 121, thereby facilitating heat transfer. In a specific scheme, at least half of the outer surface area of the electric heating tube 3 is arranged with the inner wall of the groove 121 in a brazing mode, so that the heat transfer efficiency is ensured, and the heating performance of the electric heater is improved.

Specifically, the outer sleeve of the electric heating pipe 3 is an aluminum pipe, and the outer sleeve is made of the aluminum pipe due to the good ductility of the aluminum, so that the pressing is convenient to form a required cross-sectional structure, and the problem of stress concentration caused by the pressing is avoided.

Specifically, both ends of the electric heating tube 3 slightly tilt toward the opening direction of the groove 121, which can be understood by referring to fig. 7 together, which shows a schematic structural view of the electric heating tube 3 assembled with the housing frame 11, more specifically, the electric heating tube 3 has a straight portion 31 and a tilting portion 32 located at both ends, the straight portion 31 is disposed in contact with the groove 121, so disposed, both ends of the electric heating tube 3 are conveniently connected with circuit-related components, in addition, the tilting of both ends of the electric heating tube 3 helps to protect the structure of the tilting portion 31 of the electric heating tube 3, and the structure of the tilting portion 32 of the electric heating tube 3 is prevented from being damaged in the fixing process of the electric heating tube 3 and the groove 121.

The electric heating tube 3 can be fixed in the groove 121 by brazing, or can be bonded together by other fillers, or the electric heating tube 3 and the spacer 12 can be directly die-cast together.

In a specific scheme, the periphery of the isolation component 12 extends to one side of the second side part 127 thereof to form a side partition wall 13 and an end partition wall 14, the height of the side partition wall 13 is lower than that of the end surface of the shell frame 11 on the same side with the side partition wall 13, the height of the end partition wall 14 is lower than that of the end surface of the shell frame 11 on the same side with the end partition wall 14, and the first side part of the mounting plate 2 is arranged in contact with the side partition wall 13 and the end partition wall 14; the open box-shaped structure in the example of the figure is formed by a partition element 12, two side walls 13 and two end walls 14.

In a specific scheme, the heights of the two side partition walls 13 and the two end partition walls 14 are the same and lower than the end face of the shell frame 11 on the same side, after the mounting plate 2 is fixed on the two side partition walls 13 and the two end partition walls 14, the first side portion of the mounting plate 2 is in contact with the side partition walls 13 and the end partition walls 14, and the mounting plate 2 is welded and fixed with the shell frame 11.

In this way, the partition wall is arranged so that the mounting plate 2 can be fixed thereto, facilitating subsequent welding with the housing frame 11. The mounting plate 2 is fixed with the shell frame 11 through the welded mode, can ensure the leakproofness of fluid chamber 111 on the one hand, prevents that the fluid from leaking, promotes electric heater's security, and on the other hand, the welded mode can reduce the quantity of spare part, and the installation is more convenient, and production is swift more easily.

In practice, it is preferable that the two side walls 13 and the two end walls 14 are closely attached to the peripheral wall of the housing to effectively utilize the space.

In a specific embodiment, the through hole 16 is formed in one of the two end partitions 14 to allow a lead wire connecting the electric heating tube 3 and the circuit control board 4 to pass therethrough. Because the circuit control board 4 and the electric heating tube 3 are located at two sides of the isolation component 12, in actual installation, the through hole 16 is preferably formed along the height direction of the shell frame 11, which is convenient for processing and also convenient for the penetration of a lead; of course, it is also possible that the center line of the through hole 16 is inclined at an appropriate angle compared to the height direction of the housing frame 11.

In practice, the through holes 16 are formed, and in order to ensure the size of the holes and the strength of the product, the end partition 14 with the through holes 16 has a certain thickness, which is thicker than the end partition 14 without the through holes at the other end, and the specific thickness of the end partition 14 with the through holes 16 can be set according to the requirement.

In a specific embodiment, the fluid inlet 17 and the fluid outlet 18 of the fluid chamber 111 are located on the same side of the housing frame 11, and the fluid inlet 17 and the fluid outlet 18 penetrate through a wall of the housing frame 11, and more specifically, the fluid inlet 17 and the fluid outlet 18 are opened on the end partition wall 14 having the through hole 16 and penetrate through the end wall of the housing frame 11 on the same side. Of course, it is also possible to provide the fluid inlet 17 and the fluid outlet 18 on other side walls of the housing frame 11.

As shown in the drawing, specifically, an inlet connection pipe 8 communicating with a fluid inlet 17 and an outlet connection pipe 9 communicating with a fluid outlet 18 may be fixed on the housing frame 11, so that the connection of the fluid inlet and outlet pipes is facilitated.

In a specific scheme, in order to prevent the fluid from directly flowing out of the fluid outlet 18 after entering the fluid cavity 111 from the fluid inlet 17 and not being sufficiently heated, a partition plate 125 is fixedly arranged on the inner wall of the shell frame, the fluid cavity is divided into at least two sub-cavities by the partition plate, the partition plate is positioned between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a circulation port arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a circulation port arranged between the partition plate and the inner wall of the shell frame.

In a specific embodiment, a partition plate 125 is further disposed on one of the slot walls 122 located at the middle position, the partition plate 125 divides the fluid chamber 111 into at least two sub-chambers, the two sub-chambers communicate at one end far from the fluid inlet 17 and the fluid outlet 18, obviously, the fluid inlet 17 and the fluid outlet 18 should be located at both sides of the partition plate 125, and the partition plate 125 is fixedly disposed with the end partition wall 14 having the through hole 16 and contacts with the mounting plate 2, so as to prevent the fluid from flowing out soon after flowing in.

When the arrangement is specific, the partition plate 125 may not abut against the partition wall at the other end far away from the through hole 16, and a certain distance is reserved between the two partition walls to enable the two sub-cavities to be communicated; of course, the partition plate 125 can also be abutted against the partition wall at the other end, and an outflow through hole is formed in the partition plate 125 so as to communicate the two sub-chambers.

When the above arrangement is adopted, the fluid enters the fluid chamber 111 from the fluid inlet 17, flows along the side subchamber to the other end, bypasses the partition plate 125, and flows along the other side subchamber to the fluid outlet 18, so that the flow path of the fluid in the fluid chamber 111 is approximately U-shaped, and the fluid has enough time to be heated. Of course, the partition plate may be provided in plurality.

In a specific scheme, the electric heater comprises a strong electric connector 6 and a weak electric connector 7, wherein the strong electric connector 6 and the weak electric connector 7 are positioned on the two side end walls of a shell frame 11; the strong current connector 6 is convenient for connecting the circuit control board 4 and the strong current lead of the electric heating tube 3, and the weak current connector 7 is convenient for connecting the circuit of the element needing weak current.

Arranging the strong current connector 6 and the weak current connector 7 at both ends of the housing frame 11 can prevent the strong current from affecting the signal accuracy and the control capability of the weak current.

More specifically, the strong electric connector 6 is disposed on the end wall of the case frame 11 close to the through hole 16, so that the wire arrangement between the circuit control board 4 and the electric heating tube 3 is more facilitated, and accordingly, the weak electric connector 7 is disposed on the end wall of the case frame 11 far from the through hole 16.

In actual installation, the housing frame 11 (including the peripheral wall, the partition member 12, the partition plate 125, the partition wall, the fins, and the like) may be made of aluminum or aluminum alloy, and formed by integral die casting, so that on one hand, the volume of the housing 1 can be made smaller and the weight thereof is lighter, and on the other hand, the grooves 121 on the partition member 12 are formed by die casting, which tends to be cleaner, and the electric heating tube 3 can be brazed without cleaning, thereby ensuring the brazing quality.

In addition, the aluminum casting has better heat conduction effect, and is more favorable for reducing the thermal resistance, thereby reducing the working temperature of the electric heating pipe 3 and further prolonging the service life of the electric heating pipe.

The side of the mounting plate facing the isolation component is a first side portion, which can also be called an inner side, and the side facing away from the isolation component is a second side portion, which can also be called an outer side.

Referring to fig. 8-10 together, in a specific embodiment, a convex portion 21 is disposed at a position close to an edge of the first side portion of the mounting plate 2, specifically, the convex portions 21 are disposed at two ends and two sides of the first side portion of the mounting plate 2, the convex portion 21 is adjacent to the inner wall of the partition wall, that is, the convex portion 21 at the end portion of the first side portion of the mounting plate 2 is adjacent to the end partition wall 14, and the convex portion 21 at the side portion is adjacent to the side partition wall 13, so that when the mounting plate 2 is welded, a positioning guide function can be performed, the mounting plate 2 is prevented from being deviated, the welding quality is ensured, and the sealing.

It should be pointed out here that, the effect of convex part 21 lies in fixing a position mounting panel 2, so when setting up, it need not be dead with partition wall inner wall laminating card, in practice, keep certain clearance (like 0.1 ~ 1.5mm) between convex part 21 and the partition wall can, can guarantee mounting panel 2's location on the one hand like this, on the other hand can not improve mounting panel 2's the location assembly degree of difficulty again.

On this basis, the second side of the mounting plate 2 is provided with protrusions 22, the protrusions 22 corresponding to the protrusions 21 or at least a part of the protrusions 21, each protrusion 22 having blind mounting holes extending to the corresponding protrusion 21 for mounting the circuit board 4.

Thus, the arrangement of the projection 21 and the projection 22 ensures a mounting space for the fastener for mounting the circuit board 4, and the mounting plate 2 as a whole can be made thin and light in weight.

In the illustrated embodiment, two

protrusions

21 and 22 are provided at both ends of the mounting plate 2, one protrusion 21 and one protrusion 22 are provided at both sides, and the

protrusions

21 and 22 are each a column having a square cross section. It can be understood that, in actual installation, the number and shape of the convex portions 21 and the protruding portions 22 may be determined as needed, and the heights of the both may be determined according to the installation requirements, so that the installation requirements of the circuit control board 4 and the positioning requirements of the mounting board 2 may be satisfied.

Of course, the mounting plate 2 may be fixed to the side partition walls 13 and the end partition walls 14 by fastening bolts, so that gaskets are required to be interposed between the mounting plate 2 and the partition walls to ensure the sealing performance of the fluid chambers, and in addition, since the mounting plate 2 is fixedly installed to the partition walls, the side partition walls 13 and the end partition walls 14 need to have a certain thickness to ensure a fixed installation space.

In a specific scheme, a boss 23 for mounting an IGBT5 (insulated gate bipolar transistor) of the circuit control board 4 is further arranged on the second side portion of the mounting plate 2, at least one strip-shaped protrusion 24 is arranged on the first side portion of the mounting plate 2, the strip-shaped protrusion 24 corresponds to the boss 23 in position, the structure of the three strip-shaped protrusions 24 is exemplarily shown in the figure, and the arrangement of the strip-shaped protrusions 24 is helpful for heat dissipation on one hand and can reinforce the mounting position of the IGBT5 on the other hand.

More specifically, one of the strip-shaped protrusions 24 is provided with a protruding portion 241, the boss 23 is provided with a blind mounting hole corresponding to the protruding portion 241 or at least a part of the protruding portion 241, and the blind mounting hole extends to the corresponding protruding portion 241; specifically, as illustrated in the figure, the number of the strip-shaped protrusions 24 is three, the number of the protrusions 241 is three, three blind mounting holes are provided on the boss 23 corresponding to the positions of the protrusions, and the three blind mounting holes on the boss 23 are used for mounting the IGBT 5.

Wherein, the mounting plate 2 can also be made of aluminum or aluminum alloy material. Of course, other metal materials may be used for the housing 1 and the mounting plate 2, but aluminum is preferred from the viewpoints of cost and heat conduction.

In addition, the casing 1 further includes two cover plates 15 respectively fixedly disposed at the top end and the bottom end of the casing frame 11, and the two cover bodies and the casing frame enclose a part of wall portion of the electric heating tube cavity and a part of wall portion of the installation cavity, so as to enclose the circuit control board 4 and the electric heating tube 3 in the casing 1, and are waterproof and dustproof.

Referring to fig. 11 and 12, fig. 11 is a schematic structural view of an electric heater according to a second embodiment of the present invention; fig. 12 is a schematic structural view of the electric heater of fig. 11 with the first cover plate removed.

In the present embodiment, the electric heater includes a housing 1 ', the housing 1' includes a first housing 11a and a second housing 11b, and the first housing 11a and the second housing 11b are assembled, for example, they may be fixed by a sealant or by providing a sealing ring. Two shell frames can be processed respectively, the processing difficulty is low, and the product quality is easy to guarantee.

Referring to fig. 13 to 15 together, fig. 13 is a schematic structural diagram of a first housing of the electric heater in fig. 11; FIG. 14 is a schematic view of the first housing of the electric heater of FIG. 11 at another angle; fig. 15 is a cross-sectional view of the first housing shown in fig. 13.

The first shell 11a comprises a first peripheral wall 112a and a partition 12a, the partition 12a is located inside the first peripheral wall 112a, the partition 12a is fixedly arranged with the first peripheral wall 112a, the partition 12a has a first side 126a and a second side 127a which are oppositely arranged, wherein the first side 126a of the partition 12a has a groove 121a, the electric heating tube 3 is at least partially located in the groove 121a, and the first side 126a and the first peripheral wall of the partition 12a are part of the wall forming a first space 110a (also referred to as a heating tube cavity); in a specific embodiment, a plurality of grooves 121a may be disposed on the first side portion 126a of the isolation member 12a, and the grooves 121a are arranged in parallel with each other, and the illustrated embodiment exemplarily shows a structure in which the first side portion 126a of the isolation member 12a has three parallel grooves 121 a.

Accordingly, the second side portion 127a of the partition member 12a has groove walls 122a forming the respective grooves 121a, that is, the grooves 121a are formed by recessing a portion of the first side portion 126a of the partition member 12a while the recessed portion is protruded, and the groove walls 122a are formed at the second side portion 127a of the partition member 12 a.

An electric heating tube 3 is mounted in each recess 121a of the spacer member 12 a. Of course, each groove is not limited to mounting one electric heating tube, please refer to fig. 16, which shows a schematic structural view after the electric heating tube is assembled with the first housing.

Here, the structure of the electric-heating tube 3 and the fitting with the groove 121a, etc. are the same as those of the first embodiment described above, and will not be repeated here.

Referring to fig. 17 and 18 together, fig. 17 is a schematic structural view of a second housing of the electric heater in fig. 11; fig. 18 is a schematic view of another angle of the second housing of the electric heater of fig. 11.

The second housing 11b includes a second peripheral wall 112b and a mounting plate 2b, the mounting plate 2b includes a first side portion 25b facing the isolation component 12a and a second side portion 26b facing away from the isolation component 12a, the second side portion 26b and the second peripheral wall 112b of the mounting plate are part of wall portions forming the second space 110b (also referred to as a mounting cavity), the first side portion 25b of the mounting plate, the second side portion 127a of the isolation component 12a and a part of the first peripheral wall 112a and/or the second peripheral wall 112b are part of wall portions forming the fluid cavity, and it can be understood that the second housing 11b is similar to an open box-shaped structure.

For convenience of description, the side of the first housing 11a having the groove wall 122a is hereinafter referred to as a top, the side having the groove 121a is hereinafter referred to as a bottom, that is, the side of the partition member 12a facing the first side 126a is a bottom, the side of the second housing 127a is a top, the side of the second housing 11b facing the partition member 12a is hereinafter referred to as a bottom, and the side facing away from the partition member 12a is referred to as a top, that is, the top of the mounting plate 2b facing the second space 110b is a side facing the partition member, the side of the mounting plate facing the partition member is a bottom, and the side of the mounting plate facing away from the partition member is a top, it being understood that the limitation of this directional word does not constitute a limitation of the protection scope.

Specifically, the second housing 11b may be located at the top end of the first housing 11a, and after the two are assembled, the mounting plate 2b of the second housing 11b may close the top end opening of the first housing 11a, such that the mounting plate 2b of the second housing 11b, the partition member 12a of the first housing 11a, and a portion of the first peripheral wall therebetween, and a portion of the second peripheral wall are wall portions forming a sealed accommodation chamber, which is the fluid chamber 111a, and the housing frame defines the fluid inlet 17a and the fluid outlet 18a on the peripheral wall forming the fluid chamber 111a, and more specifically, the first fluid chamber side portion of the mounting plate 2b of the second housing 11b, the second side portion of the partition member 12a of the first housing 11a, and the first peripheral wall of the first housing 11a therebetween are wall portions forming the fluid chamber 111a, and the fluid inlet 17a and the fluid outlet 18a may be located on the first housing 11a, and the fluid inlet 17a and the fluid outlet 18a penetrate the first peripheral wall. As another embodiment, a part of the fluid chamber is located in the first housing, another part of the fluid chamber is located in the second housing, the second side of the partition member, the first side of the mounting plate, a part of the first peripheral wall of the first housing located between the partition member and the mounting plate, and a part of the second peripheral wall of the second housing located between the partition member and the mounting plate are wall parts forming the fluid chamber, the fluid inlet 17a and the fluid outlet 18a may be provided in the first housing 11a, and the fluid inlet 17a and the fluid outlet 18a penetrate the first peripheral wall. Of course, in the above embodiment, the fluid inlet and the fluid outlet may be located in the second housing.

A second side portion of the mounting plate 2b, i.e., a side portion away from the partition member 12a, is also mounted with a circuit control board 4 of the vehicle to be electrically connected with the electric-heating pipe 3, thereby controlling on/off of the electric-heating pipe 3. Thus, after the electric heating tube 3 is energized, the generated heat is transferred to the fluid in the fluid chamber 111a through the groove wall 122 a.

As set forth above, it can be understood that the top space of the first space 110a of the first housing 11a partitioned by the partition member 12a is actually the fluid chamber 111a, the bottom space is the heating chamber, and the second space 110b of the second housing 11b is actually the mounting chamber of the circuit control board 4. Heating tube chamber, fluid cavity and installation cavity, and the fluid cavity is located heating tube chamber and installation cavity between, and fluid cavity and installation cavity are separated through mounting panel 2 b.

In accordance with the principle of the first embodiment, the embodiment also provides a solution that the electric heating tube 3 is isolated from the fluid chamber 111a containing the fluid, so as to avoid the electric heating tube 3 from directly contacting the fluid, thereby improving the safety and reliability of the electric heater; meanwhile, the groove 121a for installing the electric heating tube 3 is processed on the isolation member 12a, and the fluid on the other side of the isolation member 12a is heated through heat transfer, so that the heat efficiency is high.

In a specific scheme, the groove wall 122a of the first shell 11a is provided with a reinforcing rib 124a, the reinforcing rib 124a is arranged along the longitudinal direction of the groove wall 122a, and the arrangement of the reinforcing rib 124a helps to improve the strength of the groove wall 122 a; specifically, fins 123a are provided on the groove wall 122a, the fins 123a are arranged in the longitudinal direction of the groove wall 122a, and the fins 123a are distributed on both sides of the reinforcing rib 124 a. As described above, the fins 123a and the reinforcing ribs 124a are provided to help dissipate heat of the electric heating tube 3 and prolong the service life, and the fins 123a and the reinforcing ribs 124a also play a role of reinforcement to improve the strength of the slot walls 122a, so that the slot walls 122a themselves can be made thinner, thereby reducing the heat transfer resistance of the electric heating tube 3.

In a specific embodiment, the fluid inlet 17a and the fluid outlet 18a of the fluid chamber 111a are located at the same side of the first housing 11a, and the fluid inlet 17a and the fluid outlet 18a penetrate through the wall of the first housing 11a, so as to prevent the fluid from entering the fluid chamber 111a from the fluid inlet 17a and then directly flowing out from the fluid outlet 18a without being sufficiently heated, a partition plate 125a is fixedly disposed on an inner wall of a housing frame (e.g., the first housing), the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow port provided on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow port provided between the partition plate and the inner wall of the housing frame.

In a specific embodiment, a partition plate 125a is further disposed on the groove wall 122a located at the middle position, the partition plate 125a divides the fluid chamber 111a into at least two sub-chambers, the fluid inlet 17a and the fluid outlet 18a are located at two sides of the partition plate 125a, and the two sub-chambers are communicated at one end far away from the fluid inlet 17a and the fluid outlet 18 a. When the device is specifically arranged, a gap can be reserved between the partition plate 125a and the inner wall of the shell frame, and a certain distance is reserved between the two parts, so that the two sub-cavities are communicated; of course, the partition plate 125a may be provided with a flow hole, and the respective subchambers may be communicated with each other through the flow hole.

When the above arrangement is adopted, the fluid enters the fluid chamber 111a from the fluid inlet 17a, flows along the side subchamber toward the other end, bypasses the partition plate 125a, and flows along the other side subchamber toward the fluid outlet 18a, so that the flow path of the fluid in the fluid chamber 111a is approximately U-shaped, and sufficient time is provided for heating. Of course, the partition plate may be provided in plurality.

One end of the first housing 11a is opened with a first through hole 16a, the first through hole 16a penetrates through the first side portion and the second side portion of the isolation component 12a, one end of the second housing 11b is also opened with a second through hole 16b, the second through hole 16b penetrates through the first side portion and the second side portion of the mounting plate 2b, the first through hole 16a and the second through hole 16b are correspondingly and penetratingly arranged, and a lead wire electrically connected with the electric heating tube 3 and the circuit control board 4 penetrates through the first through hole 16a and the second through hole 16 b. It should be understood that the arrangement of the first and second through

holes

16a, 16b should not affect the sealability of the fluid chamber 111 a.

More specifically, the first through hole 16a, the second through hole 16b, and the fluid inlet 17a, the fluid outlet 18a are located at the same end of the housing 1'.

In a specific scheme, a strong current connector 6 and a weak current connector 7 are respectively arranged on two end walls of the second shell 11 b; the strong current connector 6 is convenient for connecting the circuit control board 4 and the strong current lead of the electric heating tube 3, and the weak current connector 7 is convenient for connecting the circuit of the element needing weak current.

Arranging the strong current connector 6 and the weak current connector 7 at both ends of the second housing 11b can prevent the strong current from affecting the signal accuracy and the control capability of the weak current.

More specifically, the strong electric connector 6 is disposed on the end wall of the second housing 11b near the second through hole 16b, so that the wire arrangement between the circuit control board 4 and the electric heating pipe 3 is more facilitated, and accordingly, the weak electric connector 7 is disposed on the end wall of the second housing 11b far from the second through hole 16 b.

Referring to fig. 19, fig. 19 is an assembly diagram of the first housing and the second housing according to the second embodiment.

In a specific scheme, a part of the outer periphery of the first housing 11a extends outwards to form a first mounting seat plate 19a, a part of the outer periphery of the second housing 11b extends outwards to form a second mounting seat plate 19b, more specifically, the peripheral wall of the first housing 11a on the top side of the isolation component 12a is thicker, the top end of the first housing 11a extends outwards along the peripheral wall to form a first mounting seat plate 19a, and two or more mounting holes are uniformly formed in the first mounting seat plate 19 a; correspondingly, the bottom end of the second housing 11b extends outwards along the peripheral wall to form a second mounting seat plate 19b, and two or more mounting holes corresponding to the mounting holes of the first mounting seat plate 19a are arranged on the second mounting seat plate 19 b.

When the first housing 11a and the second housing 11b are assembled, the second housing 11b is placed on the top end of the first housing 11a, the first mounting seat plate 19a and the second mounting seat plate 19b are positioned correspondingly, and a fastener is inserted into the corresponding mounting hole to fix the two together.

To ensure the sealing property of the fluid chamber 111a, a seal ring 100 is further provided between the first housing 11a and the second housing 11 b.

Specifically, to facilitate the placement of the sealing ring 100, the thickness of the first peripheral wall of the first housing 11a on the second side of the isolation component 12a is greater than the thickness of the first peripheral wall of the first side of the isolation component 12a, the first housing 11a is provided with a fixing groove 128a for installing the sealing ring, and a notch of the fixing groove 128a faces the second housing 11 b; or the thickness of the second peripheral wall of the second shell 11b on the second side of the mounting plate 2b is greater than that of the second peripheral wall of the second side of the mounting plate 2b, the second shell 11b is provided with a fixing groove for mounting a sealing ring, and a notch of the fixing groove faces the first shell.

In a specific embodiment, the bottom of the mounting plate 2b of the second housing 11b (i.e., the surface facing the groove wall 122 a) is provided with a protrusion 21b near the edge, and specifically, the two ends and two sides of the bottom of the mounting plate 2b are provided with protrusions 21b, so that when the second housing 11b is placed on the top of the first housing 11a, each protrusion 21b can be disposed adjacent to the inner wall surface of the top of the first housing 11a, thereby facilitating the positioning and guiding of the second housing 11b and the first housing 11a, and preventing the second housing 11b from shifting, so as to improve the assembling efficiency.

It should be noted that the protrusion 21b is used for guiding and positioning the second housing 11b, so that it is not required to be adhered to and locked with the inner wall of the first housing 11a in actual installation, and in actual installation, a certain gap (e.g. 0.1-1.5 mm) is kept between the protrusion 21b and the inner wall of the first housing 11 a.

On this basis, the top of the mounting plate 2b is provided with a protrusion 22b, the protrusion 22b corresponds to each protrusion 21b or at least a part of the protrusion 21b, and each protrusion 22b has mounting blind holes extending to the corresponding protrusion 21b for mounting the circuit board 4.

Thus, the arrangement of the projection 21b and the projection 22b can secure the mounting space of the fastener for mounting the circuit board 4, and the mounting plate 2b can be made thinner as a whole, making the second housing 11b lighter in weight.

In the illustrated embodiment, a convex portion 21b is provided at a position close to an edge of the first side portion of the mounting plate 2b, the convex portion 21b is adjacent to an inner wall of the first housing, a protrusion 22b is provided at a second side portion of the mounting plate 2b, the protrusion 22b corresponds to the convex portion 21b or at least a part of the convex portion 21b, and the convex portion 21b and the protrusion 22b may be square columns. It will be appreciated that, in actual arrangement, the number and shape of the

projections

21b and 22b may be determined as required, and the height of both may be determined according to installation requirements.

In addition, a boss 23b for mounting the IGBT5 of the circuit control board 4 is further provided on the second side of the mounting plate 2b, at least one strip-shaped protrusion 24b is provided on the bottom of the mounting plate 2b, the strip-shaped protrusion 24b corresponds to at least a part of the boss 23b or the boss 23b, the structure of three strip-shaped protrusions 24b is exemplarily shown in the figure, and the arrangement of the strip-shaped protrusion 24b helps heat dissipation on one hand and can reinforce the mounting position of the IGBT5 on the other hand.

More specifically, one of the strip-shaped protrusions 24b is provided with a protruding portion 241b, the boss 23b is provided with blind mounting holes corresponding to the protruding portion 241b in position, and the blind mounting holes all extend to the corresponding protruding portion 241 b; specifically, as illustrated in the figure, the number of the strip-shaped protrusions 24b is three, the number of the protrusions 241b is three, three blind mounting holes are provided on the boss 23b corresponding to the positions of the protrusions, and the three blind mounting holes on the boss 23b are used for mounting the IGBT 5.

In actual installation, the first housing 11a is integrally die-cast, and the second housing 11b is also integrally die-cast, that is, the first peripheral wall is integrally provided with the isolation member, and the second peripheral wall is integrally provided with the mounting plate, so that the housing 1' can be made smaller in volume and lighter in weight, and in addition, the groove 121a on the isolation member 12a is formed by die-casting, which tends to be cleaner, and the electric heating tube 3 can be brazed without cleaning, and the brazing quality can be ensured.

In addition, in the present embodiment, the first housing 11a and the second housing 11b are two independent components, and the materials can be selected according to the functions of each of the two housings in the electric heater, for example, the first housing 11a can be made of pure aluminum material to ensure thermal conductivity, and the second housing 11b can be made of alloy material to ensure the overall strength of the housing 1'.

The housing 1 'further includes a first cover plate 15a for closing the bottom opening of the first housing 11a and a second cover plate 15b for closing the top opening of the second housing 11b, the first cover plate 15a is at least a part of the wall portion forming the first space, and the second cover plate 15b is at least a part of the wall portion forming the second space, so as to enclose the circuit control board 4 and the electric heating tube 3 inside the housing 1', and is waterproof and dustproof.

It should be noted here that, in the above-described second embodiment, the peripheral wall of the fluid chamber 111a is formed in the peripheral wall portion of the first housing 11a on the top of the first housing 11a, that is, the partition member 12a, and the mounting plate 2b of the second housing 11b corresponds to the top cover plate of the fluid chamber 111 a. It can be understood that, in actual installation, the peripheral wall of the fluid chamber may also be formed in the second housing, so that the mounting plate is disposed inside the peripheral wall of the second housing, and the space enclosed by the peripheral wall of the second housing is divided into two parts, where the peripheral wall of the second housing located at the bottom side of the mounting plate is the peripheral wall of the fluid chamber, and accordingly, the isolation component is disposed at the top end of the first housing or disposed inside the first housing, and during assembly, the isolation component is used for blocking the bottom end opening of the second housing, that is, the isolation component is equivalent to the bottom cover plate of the fluid chamber.

On the basis of the basic structures of the two embodiments, the structure of the electric heater can be further improved, and the electric heater can be prevented from being burnt out, so that the safety and the reliability of the electric heater can be improved.

Referring to fig. 20 and 21, fig. 20 shows an anti-dry heating protection device of an electric heater in an embodiment, and fig. 21 is a partially enlarged view of a connection portion of a bracket and an electric heating tube in fig. 20.

It should be noted that fig. 20 shows the dry-heating prevention protector provided in the electric heater according to the first embodiment, but it should be understood that the dry-heating prevention protector can be used in the second embodiment.

In this embodiment, the electric heater includes an anti-dry heating protection device, the anti-dry heating protection device includes a support 201 and a temperature fuse 202, the temperature fuse 202 is fixedly disposed with the support 201, the support 201 contacts with the electric heating tube 3 in the groove 121, and the support 201 is fixedly disposed or contacts with the electric heating tube 3, specifically, the temperature fuse 202 is connected in series with a circuit of the electric heating tube 3. Specifically, the bracket can be fixed with the electric heating tube 3 in a welding manner, and more specifically, a brazing manner can be adopted, so that the brazing deformation is small, and the influence on the electric heating tube 3 in the welding process can be avoided. It should be noted that the support 201 and the isolation member 12 having the groove 121 should be in a non-contact state to avoid the temperature of the isolation member 12 from affecting it. Herein, the contact arrangement includes direct contact and indirect contact.

When no fluid exists in the fluid cavity, that is, the electric heater is in a dry-fire working condition, the surface temperature of the electric heating tube 3 can rise rapidly, and the support 201 is in contact with the surface of the electric heater 3, so that the heat of the electric heating tube 3 can be transferred to the temperature fuse 202 through the support 201, and after the temperature exceeds the set temperature of the temperature fuse 202, the temperature fuse 202 can be fused, so that the circuit connection of the electric heating tube 3 is cut off, and the electric heater is prevented from causing other safety accidents such as fire due to dry-fire.

In a specific scheme, the number of the grooves is two or more, the number of the electric heating pipes is two or more, each groove is provided with at least one electric heating pipe, the support 201 comprises a long strip plate 2012 and at least two extending portions 2011, the long strip plate 2012 is in contact with the two extending portions 2011 or is in an integrated structure, one of the extending portions 2011 is in contact with one electric heating pipe relatively close to the peripheral wall of the shell, and the other extending portion 2011 is in contact with the other electric heating pipe relatively close to the peripheral wall of the shell. Taking three electric heating tubes 3 shown in fig. 20 as an example, the protruding portions 2011 at two ends of the bracket 201 are respectively in contact with the electric heating tubes 3 at two sides, and the long strip 2012 spans the electric heating tubes 3.

Like this, when being in the dry combustion method operating mode, the temperature is followed the both ends simultaneous transfer of support 201, and the temperature rise is faster, can reduce the time of dry combustion method operating mode, further ensures the security.

More specifically, the holder 201 is arranged perpendicular to the longitudinal direction of the electric-heating tube 3, so that the holder 201 has a shorter length, which on the one hand saves material and on the other hand allows a faster heat transfer to the temperature fuse 202.

Specifically, extension 2011 is disposed adjacent to an end of electric heating tube 3, and support 201 is a metal support, and extension 2011 connects electric heating tube 3 and rectangular plate 2012, and extension 2011 and electric heating tube 3 fixed set or extension 2011 and isolation component fixed set. In this manner, the heat of the electric heating tube is guided to the long strip plate by the protruding portion and is further transferred to the temperature fuse, contributing to accurately transferring the temperature of the electric heating tube 3 to the temperature fuse 202. The extension 2011 is illustrated as being located between the electric heating tube 3 and the elongated strip 2012 and fixed to the electric heating tube 3. In this way, the protrusion 2011 is located on the upper surface of the electric heating tube 3, and the protrusion 2011 is in contact with the upper surface of the electric heating tube 3, which helps to accurately transmit the temperature of the electric heating tube 3 to the temperature fuse 202.

More specifically, the bracket 201 is in contact with the straight portions 31 of the at least two electric heating tubes 3, and the portion of the bracket 201 in contact with the straight portions is adjacent to the tilting portion 32 of the electric heating tubes 3, and the temperature fuse 202 is fixedly disposed with the strip plate, specifically, the temperature fuse 202 is fixedly disposed in the middle of the bracket 201. It will be appreciated that the thermal fuse 202 is only in contact with the support 201 via the connector, with its body suspended. Wherein the connecting pieces, the brackets and the like are all metal heat conducting pieces.

In a further scheme, the electric heating tube 3 is in a long strip structure, and is in a rod shape, a stick shape or other shapes. The dry-burning prevention protection device comprises two groups of supports 201 and two temperature fuses 202, wherein one of the two supports 201 is arranged near one end of the electric heating tube 3, and the other one of the two supports 201 is arranged near the other end of the electric heating tube 3.

In this way, the four corners of the electric heater can transmit the temperature to the thermal fuse 202, when the vehicle is limited by the installation space or in a special state, the electric heater may be in a non-horizontal position, there are situations where one end is high and the other end is low, and the four corners are in different heights, so that if the liquid level height of the fluid is not enough, there is a dry burning situation at one end of the electric heating tube 3 located at the high position.

As described above, after the two sets of the bracket 201 and the thermal fuse 202 are disposed at the two ends of the electric heating tube 3, when the electric heater is in an inclined state and the high end of the electric heating tube 3 is dry-burned, the temperature of the corresponding end of the electric heating tube 3 will rise quickly, and when the temperature exceeds the set temperature of the thermal fuse 202, the thermal fuse 202 will be fused to cut off the whole circuit, thereby ensuring safety.

Specifically, the bracket 201 is fixed to the electric heating tube 3 by soldering, and the thermal fuse 202 and the bracket 201 may be fastened by bolts. Thus, the thermal fuse 202 is blown to facilitate replacement of a new fuse.

Specifically, two or more electric heating tubes 3 are connected in parallel, and the thermal fuse 202 is connected in series with the trunk circuit of the connection circuit of the two or more electric heating tubes 3. Referring to fig. 22, there are two temperature fuses 202, two temperature fuses 202 are disposed adjacent to the end portions of the electric heating tubes 3, two or more electric heating tubes are parallel branches, the two temperature fuses are respectively connected to two ends of the parallel branches, and the two temperature fuses 202 are connected in series with the parallel branches. At this time, as long as one of the electric heating pipes 3 is in dry burning, the thermal fuse 202 is blown out, and the entire single path can be cut off.

The electric heater provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims

1. An electric heater comprises an electric heating pipe, a shell and a mounting plate, wherein the shell comprises a shell peripheral wall and an isolating component, the isolating component is positioned on the inner side of the shell peripheral wall, and the isolating component is fixedly arranged with the shell peripheral wall; the isolation component is provided with a first side part and a second side part which are oppositely arranged, the first side part is provided with a groove, and at least part of the electric heating pipe is positioned in the groove;

2. The electric heater of claim 1, wherein the number of the grooves is two or more, the number of the electric heating pipes is two or more, each of the grooves is provided with at least one electric heating pipe, the holder comprises an elongated strip and at least two protrusions, the elongated strip and the two protrusions are in contact or are of an integral structure, one of the protrusions is in contact with one of the electric heating pipes relatively close to the circumferential wall of the housing, and the other protrusion is in contact with the other electric heating pipe relatively close to the circumferential wall of the housing.

3. The electric heater of claim 2, wherein the extension portion is provided adjacent to an end of the electric heating tube, the extension portion connecting the electric heating tube and the elongated plate, the extension portion being fixedly provided with the electric heating tube or the extension portion being fixedly provided with the spacer.

4. The electric heater of claim 2, wherein the electric heating tube has a straight portion and raised portions at both ends, the straight portion is fixedly disposed with the groove, the bracket contacts with the straight portions of the at least two electric heating tubes and a portion of the bracket contacting with the straight portion is adjacent to the raised portions, and the temperature fuse is fixedly disposed with the strip plate.

5. The electric heater of claim 3, wherein the electric heating tube has a straight portion and raised portions at both ends, the straight portion is fixedly disposed with the groove, the bracket contacts with the straight portions of the at least two electric heating tubes and a portion of the bracket contacting with the straight portion is adjacent to the raised portions, and the temperature fuse is fixedly disposed with the strip plate.

6. The electric heater of any one of claims 1-5, the brackets being two, the electric heating tube being of an elongated configuration, one of the brackets being disposed adjacent one end of the electric heating tube and the other of the brackets being disposed adjacent the other end of the electric heating tube;

the housing includes a housing frame including the housing peripheral wall and the partition member, the housing peripheral wall and the partition member being integrally provided.

7. The electric heater according to any one of claims 1 to 5, wherein the two or more electric heating tubes are connected in parallel, and the temperature fuse is provided in series with a trunk circuit of a connection circuit of the two or more electric heating tubes.

8. The electric heater of claim 7, wherein the number of the temperature fuses is two, the two temperature fuses are disposed adjacent to the ends of the electric heating tubes, the two or more electric heating tubes are parallel branches, the two temperature fuses are respectively connected to two ends of the parallel branches, and the two temperature fuses are connected in series with the parallel branches.

9. The electric heater according to claim 6, wherein the number of the electric heating tubes is two or more, the two or more electric heating tubes are connected in parallel, and the temperature fuse is provided in series with a trunk circuit of a connection circuit of the two or more electric heating tubes.

10. The electric heater according to claim 9, wherein the number of the temperature fuses is two, the two temperature fuses are disposed adjacent to ends of the electric heating tubes, the two or more electric heating tubes are parallel branches, the two temperature fuses are respectively connected to two ends of the parallel branches, and the two temperature fuses are connected in series with the parallel branches.

11. The electric heater according to any one of claims 1 to 5, wherein a circuit control board electrically connected to the electric heating tube is mounted to a side portion of the mounting plate facing the mounting cavity, the partition member has a through hole communicating the heating tube cavity and the mounting cavity, and a lead wire electrically connected to the electric heating tube passes through the through hole and is electrically connected to the circuit control board.

12. The electric heater of claim 6, wherein a circuit control board electrically connected to the electric heating tube is mounted on a side portion of the mounting plate facing the mounting cavity, the spacer member has a through hole communicating the heating tube cavity and the mounting cavity, and a lead wire electrically connected to the electric heating tube passes through the through hole and is electrically connected to the circuit control board.

13. The electric heater of claim 7, wherein a circuit control board electrically connected to the electric heating tube is mounted on a side portion of the mounting plate facing the mounting cavity, the spacer member has a through hole communicating the heating tube cavity and the mounting cavity, and a lead wire electrically connected to the electric heating tube passes through the through hole and is electrically connected to the circuit control board.

14. The electric heater of claim 8, wherein a circuit control board electrically connected to the electric heating tube is mounted on a side portion of the mounting plate facing the mounting cavity, the spacer member has a through hole communicating the heating tube cavity and the mounting cavity, and a lead wire electrically connected to the electric heating tube passes through the through hole and is electrically connected to the circuit control board.

15. The electric heater of claim 9, wherein a circuit control board electrically connected to the electric heating tube is mounted on a side portion of the mounting plate facing the mounting cavity, the spacer member has a through hole communicating the heating tube cavity and the mounting cavity, and a lead wire electrically connected to the electric heating tube passes through the through hole and is electrically connected to the circuit control board.

16. The electric heater of claim 10, wherein a circuit control board electrically connected to the electric heating tube is mounted to a side portion of the mounting plate facing the mounting cavity, the partition member has a through hole communicating the heating tube cavity and the mounting cavity, and a lead wire electrically connected to the electric heating tube passes through the through hole and is electrically connected to the circuit control board.

17. The electric heater according to any one of claims 1 to 5, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

18. The electric heater of claim 6, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

19. The electric heater of claim 7, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

20. The electric heater of claim 8, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

21. The electric heater of claim 9, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

22. The electric heater of claim 10, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

23. The electric heater of claim 11, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

24. The electric heater of claim 12, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

25. The electric heater of claim 13, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

26. The electric heater of claim 14, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

27. The electric heater of claim 15, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

28. The electric heater of claim 16, wherein the bracket is a metal bracket, the bracket is fixed to the electric heating tube by brazing, and the temperature fuse is fixed to the bracket by bolting;

29. The electric heater according to any one of claims 1 to 5, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow opening arranged between the partition plate and the inner wall of the housing.

30. The electric heater of claim 6, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

31. The electric heater of claim 7, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

32. The electric heater of claim 8, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

33. The electric heater of claim 9, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

34. The electric heater of claim 10, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

35. The electric heater of claim 11, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

36. The electric heater of claim 12, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

37. The electric heater of claim 13, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

38. The electric heater of claim 14, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

39. The electric heater of claim 15, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

40. The electric heater of claim 16, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

41. The electric heater of claim 17, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

42. The electric heater of claim 18, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through port arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through port arranged between the partition plate and the inner wall of the housing.

43. The electric heater of claim 19, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

44. The electric heater of claim 20, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

45. The electric heater of claim 21, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

46. The electric heater of claim 22, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

47. The electric heater of claim 23, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

48. The electric heater of claim 24, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

49. The electric heater of claim 25, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

50. The electric heater of claim 26, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

51. The electric heater of claim 27, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

52. The electric heater of claim 28, wherein the fluid inlet and the fluid outlet are located on the peripheral wall of the housing, a partition plate is fixedly arranged on the inner wall of the housing, the partition plate divides the fluid chamber into at least two sub-chambers, the partition plate is located between the fluid inlet and the fluid outlet, and the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged on the partition plate, or the fluid inlet and the fluid outlet are communicated through a flow-through opening arranged between the partition plate and the inner wall of the housing.

53. The electric heater according to any one of claims 1 to 5, wherein a side portion of the mounting plate facing the fluid chamber is provided with a convex portion, and a side portion of the mounting plate facing the mounting chamber is provided with a protrusion corresponding to the convex portion or at least a part of the convex portion in position, the protrusion having a mounting blind hole extending to the convex portion;

a boss for installing the insulated gate bipolar transistor of the circuit control panel is arranged at one side part of the installation plate, facing the installation cavity, a strip-shaped bulge is arranged at one side part of the installation plate, facing the fluid cavity, and the strip-shaped bulge corresponds to the boss in position; one of the strip-shaped bulges is provided with a protruding part, the boss is provided with a blind mounting hole, the blind mounting hole corresponds to the protruding part or at least one part of the protruding part, and the blind mounting hole extends to the corresponding protruding part.

54. The electric heater of claim 6, wherein a side of the mounting plate facing the fluid chamber is provided with a protrusion corresponding to the protrusion or at least a portion of the protrusion, the protrusion having a blind mounting hole extending to the protrusion;

55. The electric heater of claim 7, wherein a side of the mounting plate facing the fluid chamber is provided with a protrusion corresponding to the protrusion or at least a portion of the protrusion, the protrusion having a blind mounting hole extending to the protrusion;

56. The electric heater of claim 8, wherein a side of the mounting plate facing the fluid chamber is provided with a protrusion corresponding to the protrusion or at least a portion of the protrusion, the protrusion having a blind mounting hole extending to the protrusion;

57. The electric heater of claim 9, wherein a side of the mounting plate facing the fluid chamber is provided with a protrusion corresponding to the protrusion or at least a portion of the protrusion, the protrusion having a blind mounting hole extending to the protrusion;

58. The electric heater of claim 10, wherein a side of the mounting plate facing the fluid chamber is provided with a protrusion corresponding to the protrusion or at least a portion of the protrusion, the protrusion having a blind mounting hole extending to the protrusion;