Double-layer heating device

Abstract

The utility model relates to a double-layer heating device, which comprises a first heating plate provided with a first heat conduction surface, a first heating surface and a plurality of first through holes penetrating through the first heat conduction surface and the first heating surface, the first electric heating layer is arranged on the first heat conduction surface and / or the first heating surface; the heating lining plate is provided with a first lining plate surface and a second lining plate surface which are oppositely arranged and a plurality of lining plate through holes penetrating through the first lining plate surface and the second lining plate surface, and the first lining plate surface is arranged on the first heat conduction surface; the second heating plate is provided with a second heat conduction surface, a second heating surface and a plurality of second through holes penetrating through the second heat conduction surface and the second heating surface which are oppositely arranged, the second heat conduction surface is arranged on the second lining plate surface, and the first through holes, the second through holes and the lining plate through holes are in one-to-one correspondence; and the second electric heating layer is arranged on the second heat conduction surface and / or the second heating surface. According to the double-layer heating device, double-layer heating is achieved through the two parallel heating plates, higher heating power is achieved in a limited structural area, and the heating power density is small.

Description

Technical Field

[0001] The utility model relates to an automobile air conditioner heating device, in particular to a double-layer heating device. Background Art

[0002] In order to improve the heating comfort of electric vehicles, a liquid heater is mostly used to heat air. For example, an automobile liquid heater disclosed in CN111536690A includes a housing and a bottom cover and a top cover provided on both sides of the housing. A first accommodation cavity is provided on one side of the housing near the bottom cover, and a circuit board is provided in the first accommodation cavity; a second accommodation cavity is provided on one side of the housing near the top cover, and a heating component is provided in the second accommodation cavity. The housing is also provided with a water inlet and a water outlet communicated with the second accommodation cavity. A first step groove is provided at the top of the open end of the first accommodation cavity, and a second step groove is provided at the top of the open end of the second accommodation cavity; the bottom cover and the top cover are respectively connected and fixed in the first step groove and the second step groove in a form of upper and lower overlapping friction welding, and a heat dissipation fin is integrally formed on the lower surface of its heating substrate. This heater uses a single heating substrate to heat the liquid in the flow channel, and the heating efficiency is relatively low. In order to ensure reliable heat exchange and heat exchange efficiency, the heating substrate needs to have a large area, which results in a large overall occupied area of the heater. If the heating power per unit area is increased, it will cause too high local temperature and unstable temperature control. Therefore, the existing structure is difficult to meet the requirements of high heating effect and small heating area at the same time. Summary of the Utility Model

[0003] In order to solve the problems of the large area and low heat exchange efficiency of the above heater, the utility model provides a double-layer heating device, and the specific technical solution is as follows:

[0004] A double-layer heating device includes: a first heating plate having a first heat conducting surface, a first heating surface disposed opposite to each other, and a plurality of first through holes penetrating the first heat conducting surface and the first heating surface; a first electric heating layer disposed on the first heat conducting surface and / or the first heating surface; a heating liner plate having a first liner plate surface and a second liner plate surface disposed opposite to each other, and a plurality of liner plate through holes penetrating the first liner plate surface and the second liner plate surface, the first liner plate surface being disposed on the first heat conducting surface; a second heating plate having a second heat conducting surface, a second heating surface disposed opposite to each other, and a plurality of second through holes penetrating the second heat conducting surface and the second heating surface, the second heat conducting surface being disposed on the second liner plate surface, and the first through holes, the second through holes and the liner plate through holes corresponding to each other one by one; and a second electric heating layer disposed on the second heat conducting surface and / or the second heating surface.

[0005] Preferably, it further includes a plurality of heating sealing rings, the heating sealing rings are disposed at both ends of the liner plate through holes and respectively abut against the first heat conducting surface and the second heat conducting surface.

[0006] Preferably, a plurality of first sealing grooves are provided on both the first lining surface and the second lining surface, and the heating sealing ring is disposed in the first sealing groove.

[0007] Preferably, the heating lining plate is provided with heat dissipation grooves penetrating through the first lining surface and the second lining surface, and the heat dissipation grooves are disposed opposite to the first electric heating layer and the second electric heating layer.

[0008] Furthermore, a plurality of first connecting beams and second connecting beams are provided in the heat dissipation grooves, the first connecting beams and the second connecting beams are connected to each other and are connected to the heat dissipation grooves.

[0009] Furthermore, a plurality of support bodies are provided on both the first connecting beam and the second connecting beam, and the support bodies are used to abut against the first heat conducting surface and the second heat conducting surface.

[0010] Wherein, a plurality of first support holes and second support holes are respectively provided on both the first electric heating layer and the second electric heating layer, and both ends of the support body are respectively inserted into the first support hole and the second support hole.

[0011] Furthermore, a plurality of reinforcing ribs are further provided in the heat dissipation grooves.

[0012] Furthermore, a first wiring groove communicating with the heat dissipation groove is provided on the first lining surface, and a first support block for abutting against the first heat conducting surface is provided on the first wiring groove; a second wiring groove communicating with the heat dissipation groove is provided on the second lining surface, and a second support block for abutting against the second heat conducting surface is provided on the second wiring groove.

[0013] Preferably, a first wiring board is provided on one side of the first heating plate, and a second wiring board is provided on one side of the second heating plate.

[0014] Compared with the prior art, the present utility model has the following beneficial effects:

[0015] A double-layer heating device provided by the present utility model realizes double-layer heating through two parallel heating plates, can greatly reduce the area of the heating plates without changing the heating power, can achieve higher power per unit volume and power per unit mass, realize higher heating power in a limited structural area, reduce the heating power density of the heating plates, and thus can improve the reliability and service life of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the present application;

[0017] Figure 2 is an exploded view of the present application;

[0018] Figure 3 is a cross-sectional view of the present application;

[0019] Figure 4 is a schematic diagram of the flow of the liquid;

[0020] Figure 5 is a schematic structural diagram of the first heating plate;

[0021] Figure 6 is a schematic structural diagram of the heating liner;

[0022] Figure 7 is a schematic structural diagram of the second heating plate. Detailed implementation manners

[0023] The present utility model will be further described below in conjunction with the accompanying drawings.

[0024] Such as Figures 1 to 7As shown in the figure, a double-layer heating device includes a first heating plate 1, a heating liner 2, and a second heating plate 3 that are stacked in sequence. It also includes a first electric heating layer 12 and a second electric heating layer 32. The first heating plate 1 includes a first heat-conducting surface 14, a first heating surface 13, and a first through-hole 11. The first heat-conducting surface 14 is parallel to the first heating surface 13 and is located on both sides of the first heating plate 1 respectively. There are two first through-holes 11, and they are located at one end of the first heating plate 1. The first through-hole 11 is a through-hole that penetrates through the first heat-conducting surface 14 and the first heating surface 13. In order to increase the flow rate, the first through-hole 11 is a kidney-shaped hole. The first electric heating layer 12 can be separately provided on the first heat-conducting surface 14 or the first heating surface 13, or can be provided on both the first heat-conducting surface 14 and the first heating surface 13 at the same time. The structure of the second heating plate 3 is basically the same as that of the first heating plate 1. On both sides of the second heating plate 3, there are a second heat-conducting surface 36 and a second heating surface 35 that are parallel to each other. At one end of the second heating plate 3, there is a second through-hole 31 that penetrates through the second heat-conducting surface 36 and the second heating surface 35. There are two second through-holes 31, and they are kidney-shaped holes. The second through-hole 31 has the same shape and size as the first through-hole 11 and is coaxially arranged with the first through-hole 11. The second electric heating layer 32 can be separately provided on the second heat-conducting surface 36 or the second heating surface 35, or can be provided on both the second heat-conducting surface 36 and the second heating surface 35 at the same time. The heating liner 2 includes a first liner surface 27 and a second liner surface 28 that are parallel to each other and several liner through-holes 22 that penetrate through the first liner surface 27 and the second liner surface 28. The first liner surface 27 and the second liner surface 28 are located on both sides of the heating liner 2 respectively. The first liner surface 27 and the second liner surface 28 are respectively abutted against the first heat-conducting surface 14 and the second heat-conducting surface 36. The heating liner 2 is used to isolate the two heating plates, avoiding the situation that the two heating plates are attached together for heating, resulting in local overheating, deformation, burning out of the heating layer, etc., and improving the stability and reliability of heating. The liner through-holes 22 are provided at one end of the heating liner 2, and there are two of them. The liner through-holes 22 are kidney-shaped holes, with the same size as the first through-hole 11 and the second through-hole 31. The liner through-holes 22 correspond to the first through-hole 11 and the second through-hole 31 one by one. The liner through-holes 22, the first through-hole 11, and the second through-hole 31 form a liquid channel.

[0025] Both the first electric heating layer 12 and the second electric heating layer 32 are existing mature heating layers. The first electric heating layer 12 and the second electric heating layer 32 can include an insulating dielectric layer, a conductive layer, and a protective layer formed by printing and sintering layer by layer from bottom to top in a non-cocombustion form. The first electric heating layer 12 and the second electric heating layer 32 can also be heating films.

[0026] The double-layer heating device is installed inside the heater. The liquid to be heated sequentially passes through the first heat-conducting surface 14, the first through-hole 11, the through-hole 22 of the lining plate, the second through-hole 31, and the second heat-conducting surface 36 to achieve double-layer heating of the liquid. Since the two heating plates are stacked, the area of the heating device can be reduced without changing the heating power, and higher power per unit volume and power per unit mass can be achieved, realizing higher heating power in a limited structural area and reducing the heating power density of the heating plate, thereby improving the reliability and service life of the product.

[0027] When the heating area and heating power meet the heating requirements, the first electric heating layer 12 and the second electric heating layer 32 are respectively arranged on the first heating surface 13 and the second heating surface 35, so that both the first electric heating layer 12 and the second electric heating layer 32 are located on one side of the heating lining plate 2, and no heating layer is arranged on the first heat-conducting surface 14 and the second heat-conducting surface 36, reducing the requirements for the insulation and sealing of the heating layer.

[0028] To improve the sealing performance between the through-hole 22 of the lining plate and the first through-hole 11 and the second through-hole 31, and prevent the liquid from entering between the heating lining plate 2, the first heating plate 1, and the second heating plate 3, heating sealing rings 41 are installed between the heating lining plate 2, the first heating plate 1, and the second heating plate 3, and the heating sealing rings 41 are located at both ends of the through-hole 22 of the lining plate. Waist-shaped heating sealing grooves 23 are respectively arranged on the first lining plate surface 27 and the second lining plate surface 28 of the heating lining plate 2, and the heating sealing grooves 23 are also located at both ends of the through-hole 22 of the lining plate. The heating sealing rings 41 are installed in the heating sealing grooves 23.

[0029] The heating liner 2 is provided with heat dissipation grooves 21. The heat dissipation grooves 21 are through grooves that penetrate the first liner surface 27 and the second liner surface 28, and are used to form a heat dissipation cavity. The heat dissipation grooves 21 are disposed opposite to the first electric heating layer 12 and the second electric heating layer 32, such that the first electric heating layer 12 and the second electric heating layer 32 are located inside the heat dissipation grooves 21. This avoids directly heating the heating liner 2 by the heating layer, prevents local overheating of the heating liner 2, and protects the first electric heating layer 12 and the second electric heating layer 32. The heat dissipation grooves 21 make the heating liner 2 in a frame shape. To improve the strength of the heating liner 2, a first connecting beam 241 and a second connecting beam 242 are provided in the heat dissipation grooves 21. The first connecting beam 241 and the second connecting beam 242 are connected to each other in a cross shape. The ends of the first connecting beam 241 and the second connecting beam 242 are connected to the heat dissipation grooves 21, and the first connecting beam 241 and the second connecting beam 242 are respectively located on the center lines in the length direction and the width direction. The first connecting beam 241 and the second connecting beam 242 can effectively prevent the edges of the heating liner 2 from deforming. Further, to improve the support for the first heating plate 1 and the second heating plate 3, two support bodies 243 are provided on both the first connecting beam 241 and the second connecting beam 242. The support bodies 243 are used to abut against the first heat conducting surface 14 and the second heat conducting surface 36. To prevent the support bodies 243 from pressing and damaging the first electric heating layer 12 and the second electric heating layer 32, four first support holes 16 and second support holes 34 are respectively provided on the first electric heating layer 12 and the second electric heating layer 32. The first support holes 16 and the second support holes 34 respectively correspond to the support bodies 243 one by one. The two ends of the support bodies 243 are respectively inserted into the first support holes 16 and the second support holes 34.

[0030] A number of reinforcing ribs 29 are also provided in the heat dissipation grooves 21. The reinforcing ribs 29 are located at one end away from the liner through hole 22, to strengthen the end part of the heating liner 2 and reduce the deformation of the end part of the heating liner 2.

[0031] To avoid squeezing the first wire of the first electric heating layer 12 and the second connecting wire of the second electric heating layer 32, a first wiring groove 251 communicating with the heat dissipation grooves 21 is provided on the first liner surface 27, and a first support block 261 for abutting against the first heat conducting surface 14 is provided on the first wiring groove 251; a second wiring groove 252 communicating with the heat dissipation grooves 21 is provided on the second liner surface 28, and a second support block 262 for abutting against the second heat conducting surface 36 is provided on the second wiring groove 252. The first wire passes through the first wiring groove 251, and the first wire is connected to the first connector 17. The first connector 17 is welded on the first wiring board 15 on one side of the first heating plate 1. The first wiring board 15 and the first heating plate 1 are an integral structure. The second wire passes through the second wiring groove 252, and the second wire is connected to the second connector 37. The second connector 37 is welded on the second wiring board 33. The second wiring board 33 is located on one side of the second heating plate 3. The second connector 37 and the second heating plate 3 are an integral structure.

[0032] Both the first heating plate 1 and the second heating plate 3 are metal plates with good heat conduction performance, and stainless steel plates, aluminum plates, copper plates, etc. can be used.

[0033] As Figure 4 shown, an upper housing 5 is installed on the first heat conduction surface 14 of the first heating plate 1, a heating sealing ring 41 is installed between the first heat conduction surface 14 and the upper housing 5, an upper cavity 54 and a water inlet communicating with the upper cavity 54 are provided on the upper housing 5; a lower housing 6 is installed on the second heat conduction surface 36 of the second heating plate 3, a heating sealing ring 41 is installed between the second heat conduction surface 36 and the lower housing 6, a lower cavity 61 and a water outlet communicating with the lower cavity 61 are provided on the lower housing 6.

[0034] During operation, the liquid medium for heating enters the upper cavity 54 through the water inlet, and passes through the first heat conduction surface 14. The first electric heating layer 12 heats the liquid through the first heat conduction surface 14. Then the liquid sequentially passes through the first through hole 11, the lining plate through hole 22, and the second through hole 31 and enters the lower cavity 61. The second electric heating layer 32 heats the liquid in the lower cavity 61 through the second heat conduction surface 36. The liquid heated to the set temperature flows out through the water outlet and enters the heat exchanger of the vehicle to heat the air inside the vehicle.

[0035] This double-layer heating device can also be used for heating in other fields, and has the advantages of small size, high heating efficiency, long service life, and stable and reliable operation.

[0036] The technical principle of the present utility model has been described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present utility model and cannot be construed as a limitation of the protection scope of the present utility model in any way. Based on the explanations herein, those skilled in the art can think of other specific embodiments of the present utility model without creative labor, and these embodiments will fall within the protection scope of the claims of the present utility model.

Claims

1. A double-layer heating device, characterized in that: include: A first heating plate (1) is provided with a first heat-conducting surface (14), a first heating surface (13) and a plurality of first through holes (11) penetrating the first heat-conducting surface (14) and the first heating surface (13); A first electric heating layer (12) is arranged on the first heat conducting surface (14) and / or the first heating surface (13); A heating lining plate (2) is provided with a first lining plate surface (27) and a second lining plate surface (28) arranged opposite to each other and a plurality of lining plate through holes (22) penetrating the first lining plate surface (27) and the second lining plate surface (28), wherein the first lining plate surface (27) is arranged on the first heat conducting surface (14); The second heating plate (3) is provided with a second heat-conducting surface (36), a second heating surface (35) and a plurality of second through holes (31) penetrating the second heat-conducting surface (36) and the second heating surface (35), the second heat-conducting surface (36) being provided on the second lining plate surface (28), and the first through holes (11), the second through holes (31) and the lining plate through holes (22) being in one-to-one correspondence; and The second electric heating layer (32) is arranged on the second heat conducting surface (36) and / or the second heating surface (35).

2. A double-layer heating device according to claim 1, characterized in that: It also includes a plurality of heating sealing rings (41), which are arranged at both ends of the lining plate through hole (22) and respectively abut against the first heat conducting surface (14) and the second heat conducting surface (36).

3. A double-layer heating device according to claim 2, characterized in that: A plurality of heating sealing grooves (23) are provided on the first lining plate surface (27) and the second lining plate surface (28), and the heating sealing ring (41) is arranged in the heating sealing groove (23).

4. A double-layer heating device according to claim 1, characterized in that: The heating lining plate (2) is provided with a heat dissipation groove (21) penetrating the first lining plate surface (27) and the second lining plate surface (28); the heat dissipation groove (21) is arranged opposite to the first electric heating layer (12) and the second electric heating layer (32).

5. A double-layer heating device according to claim 4, characterized in that: A plurality of first connecting beams (241) and second connecting beams (242) are arranged in the heat dissipation groove (21); the first connecting beams (241) and the second connecting beams (242) are connected to each other and to the heat dissipation groove (21).

6. A double-layer heating device according to claim 5, characterized in that: A plurality of support bodies (243) are provided on the first connecting beam (241) and the second connecting beam (242), and the support bodies (243) are used to abut against the first heat conducting surface (14) and the second heat conducting surface (36).

7. A double-layer heating device according to claim 6, characterized in that: The first electric heating layer (12) and the second electric heating layer (32) are respectively provided with a plurality of first supporting holes (16) and second supporting holes (34), and the two ends of the supporting body (243) are respectively inserted into the first supporting holes (16) and the second supporting holes (34).

8. A double-layer heating device according to claim 4, characterized in that: A plurality of reinforcing ribs (29) are also provided in the heat dissipation groove (21).

9. A double-layer heating device according to claim 4, characterized in that: The first lining surface (27) is provided with a first wiring groove (251) communicating with the heat dissipation groove (21), and the first wiring groove (251) is provided with a first support block (261) for abutting against the first heat conduction surface (14); The second lining plate surface (28) is provided with a second wiring groove (252) communicating with the heat dissipation groove (21), and the second wiring groove (252) is provided with a second support block (262) for abutting against the second heat conduction surface (36).

10. A double-layer heating device according to claim 1, characterized in that: A first terminal board (15) is provided on one side of the first heating plate (1), and a second terminal board (33) is provided on one side of the second heating plate (3).

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