Heating device

Abstract

The utility model relates to the technical field of liquid heating equipment, in particular to a heating device which comprises a first electric heating piece, a heat exchange piece, a first end cover, a second end cover, a first transition cavity and a second transition cavity. The first transition cavity is communicated with the liquid outlet end of the cold runner and the liquid inlet end of the first heating runner, the liquid inlet end of the cold runner is communicated with a water source, the second transition cavity is communicated with the liquid outlet end of the first heating runner and the liquid inlet end of the hot runner, and one of the first transition cavity and the second transition cavity is arranged on the first end cover. And the other one of the first transition cavity and the second transition cavity is arranged on the second end cover. According to the device, the first electric heating piece and the heat exchange piece are integrally assembled together, the overall structure is more compact, the first electric heating piece and the heat exchange piece are communicated through the first end cover and the second end cover, use of connecting pipelines is reduced, the structure is more compact, and meanwhile the assembling difficulty can be lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid heating equipment, in particular to a heating device. Background Art

[0002] After the water dispenser heats the water, the user needs to wait for the hot water to cool down before drinking it. In order to quickly cool down the hot water, the heated liquid is connected to a heat exchanger in the prior art to speed up the cooling of the hot water. The pipe structure connecting the heat exchanger and the hot water in the prior art is relatively complicated. Utility Model Content

[0003] The utility model aims to solve the problem that the pipe structure connecting the heat exchanger and the hot water in the prior art is relatively complicated, and proposes a heating device.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A heating device comprises a first electric heating element, a heat exchange element, a first end cover, a second end cover, a first transition chamber, and a second transition chamber, wherein the first electric heating element has a first heating flow channel, the heat exchange element has a cold flow channel and a hot flow channel, the first transition chamber connects the liquid outlet of the cold flow channel with the liquid inlet of the first heating flow channel, the liquid inlet of the cold flow channel is connected to a water source, the second transition chamber connects the liquid outlet of the first heating flow channel with the liquid inlet of the hot flow channel, the first transition chamber and the second transition chamber are arranged on the first end cover, or the first transition chamber and the second transition chamber are arranged on the second end cover, or one of the first transition chamber and the second transition chamber is arranged on the first end cover, and the other of the first transition chamber and the second transition chamber is arranged on the second end cover.

[0006] The first electric heating element comprises at least two first electric heating tubes, the first end cover has a third connecting cavity, and / or the second end cover has a third connecting cavity, and a plurality of the first electric heating tubes are connected in series and / or in parallel via the third connecting cavity;

[0007] And / or the heat exchange element includes at least two groups of heat exchange tube groups, each group of the heat exchange tube groups includes a first tube body and a second tube body that are sleeved, the cold runner is provided between the inner wall of the first tube body and the outer wall of the second tube body, the inner wall of the second tube body has the hot runner, the first end cover has a first connecting cavity and / or a second connecting cavity, and / or the second end cover has a first connecting cavity and / or a second connecting cavity, the cold runners of multiple heat exchange tube groups are connected in series and / or in parallel through the first connecting cavity, and the hot runners of multiple heat exchange tube groups are connected in series and / or in parallel through the second connecting cavity.

[0008] The first end cover comprises a first cover shell, a second cover shell and a third cover shell, wherein a first connecting cavity and / or a third connecting cavity and / or a first transition cavity are formed between the first cover shell and the second cover shell; a second connecting cavity and / or a second transition cavity are formed between the second cover shell and the third cover shell;

[0009] And / or the second end cover includes a fourth cover shell, a fifth cover shell, and a sixth cover shell, and a first connecting cavity and / or a third connecting cavity and / or a first transition cavity are formed between the fourth cover shell and the fifth cover shell; a second connecting cavity and / or a second transition cavity are formed between the fifth cover shell and the sixth cover shell.

[0010] The first cover shell, the second cover shell, and the third cover shell are stacked in sequence along the axial direction of the first electric heating element, the first cover shell is located on a side of the second cover shell close to the first electric heating element, and the third cover shell is located on a side of the second cover shell away from the first electric heating element;

[0011] And / or the fourth cover shell, the fifth cover shell and the sixth cover shell are stacked in sequence along the axial direction of the first electric heating element, the fourth cover shell is located on the side of the fifth cover shell close to the first electric heating element, and the sixth cover shell is located on the side of the fifth cover shell away from the first electric heating element.

[0012] The heating device comprises a shell, the first end cover is fixed at one end of the shell, the second end cover is fixed at the other end of the shell, the heat exchange element is at least partially located inside the shell, and the first electric heating element is at least partially located inside the shell.

[0013] A plurality of temperature controllers are installed on the housing;

[0014] And / or a first temperature sensor is arranged between the liquid outlet of the cold flow channel and the liquid inlet of the first heating flow channel;

[0015] And / or a second temperature sensor is provided between the liquid outlet of the first heating channel and the liquid inlet of the hot runner.

[0016] The heating device includes a second electric heating element, the second electric heating element has a second heating channel, the first end cover has a third transition cavity, and / or the second end cover has a third transition cavity, and the liquid outlet of the hot channel is connected to the liquid inlet of the second heating channel through the third transition cavity.

[0017] The second electric heating element comprises at least two second electric heating tubes, the first end cover has a fourth communication cavity, and / or the second end cover has a fourth communication cavity, and a plurality of the second electric heating tubes are connected in series and / or in parallel via the fourth communication cavity;

[0018] And / or the heating device includes a reversing tube, the third transition chamber includes a third transition chamber I and a third transition chamber II, the first end cover is provided with a third transition chamber I, the second end cover is provided with a third transition chamber II, one end of the reversing tube is connected to the liquid outlet of the hot runner through the third transition chamber I, and the other end of the reversing tube is connected to the liquid inlet of the second heating runner through the third transition chamber II.

[0019] The heating device comprises a water storage container and a water pump, wherein the liquid inlet of the water pump is connected to the water storage container, and the liquid outlet of the water pump is connected to the liquid inlet of the cold flow channel;

[0020] And / or a third temperature sensor is provided between the liquid outlet of the hot runner and the liquid inlet of the second heating runner;

[0021] And / or a fourth temperature sensor is provided at the liquid outlet of the second heating channel.

[0022] The heating device includes a liquid inlet, a liquid outlet, and a reversing valve. The reversing valve has a first liquid inlet, a first liquid outlet, and a second liquid outlet. The liquid outlet of the water pump is connected to the liquid inlet of the cold runner through the liquid inlet, and the liquid outlet of the hot runner is connected to the first liquid inlet of the reversing valve. The first liquid outlet of the reversing valve is connected to a water storage container, and the second liquid outlet of the reversing valve is connected to the liquid inlet of the second heating runner, and the liquid outlet of the second heating runner is connected to the liquid outlet.

[0023] The utility model proposes a heating device, which has the beneficial effect that the first electric heating element and the heat exchange element of the device are integrated together through the first end cover and the second end cover, so that the overall structure is more compact, the first end cover and the second end cover are provided with a first transition cavity and / or a second transition cavity, the first electric heating element and the heat exchange element are connected through the first end cover and the second end cover, the use of connecting pipelines is reduced, the structure is more compact, and the difficulty of assembly can be reduced at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the three-dimensional structure of the first embodiment of the utility model Figure 1 ;

[0025] Figure 2 This is a schematic diagram of the three-dimensional structure of the first embodiment of the utility model Figure 2 ;

[0026] Figure 3 The internal structure of the first embodiment of the utility model is shown in FIG. Figure 1 ;

[0027] Figure 4 The internal structure of the first embodiment of the utility model is shown in FIG. Figure 2 ;

[0028] Figure 5This is a schematic cross-sectional view of the first embodiment of the utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the second connecting cavity in the first embodiment of the utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the first connecting cavity and the third connecting cavity in the first embodiment of the utility model;

[0031] Figure 8 This is a partial cross-sectional view of the first embodiment of the utility model. Figure 1 ;

[0032] Fig. 9 This is a partial cross-sectional view of the first embodiment of the utility model. Figure 2 ;

[0033] Fig.10 This is a partial cross-sectional view of the first embodiment of the utility model. Figure 3 ;

[0034] Fig.11 This is a schematic diagram of the structure of the second connecting cavity and the second transition cavity in the first embodiment of the utility model;

[0035] Fig.12 This is a schematic diagram of the structure of the first connecting cavity and the first transition cavity in the first embodiment of the utility model;

[0036] Fig.13 This is a schematic diagram of the third embodiment of the present invention. Figure 1 ;

[0037] Fig.14 This is a schematic diagram of the third embodiment of the present invention. Figure 2 ;

[0038] Fig.15 The internal structure of the second embodiment of the utility model is shown in FIG. Figure 1 ;

[0039] Fig.16 The internal structure of the second embodiment of the utility model is shown in FIG. Figure 2 ;

[0040] Fig.17 This is a schematic structural diagram of the second connecting cavity and the third transition cavity I in the second embodiment of the utility model;

[0041] Fig.18 This is a schematic diagram of the first connecting cavity and the fourth connecting structure of the second embodiment of the utility model;

[0042] Fig.19This is a schematic diagram of the structure of the second communicating cavity in the second embodiment of the utility model;

[0043] Fig. 20 This is a schematic structural diagram of the first connecting cavity and the third transition cavity II in the second embodiment of the utility model;

[0044] Fig.21 It is a schematic diagram of the principle structure of the third implementation mode of the utility model.

[0045] In the figure: shell 1, first end cover 2, second end cover 3, thermostat 4, liquid inlet 5, liquid outlet 6, heat exchange element 7, first electric heating element 8, first heating flow channel 81, first electric heating tube 82, cold flow channel 9, hot flow channel 10, first tube body 11, second tube body 12, first temperature sensor 13, second temperature sensor 14, first connecting cavity 15, second connecting cavity 16, third connecting cavity 17, first transition cavity 18, second transition cavity 19, second electric heating element 20, second heating flow channel 201, third transition cavity I 211, third transition cavity II 212, fourth connecting cavity 22, reversing tube 23, first cover shell 24, second cover shell 25, third cover shell 26, fourth cover shell 27, fifth cover shell 28, sixth cover shell 29, third temperature sensor 30, fourth temperature sensor 31. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0047] Reference Figure 1-21 A heating device comprises a first electric heating element 8, a heat exchange element 7, a first end cover 2, a second end cover 3, a first transition chamber 18, and a second transition chamber 19. The first electric heating element 8 has a first heating flow channel 81, and the heat exchange element 7 has a cold flow channel 9 and a hot flow channel 10. The first transition chamber 18 connects the liquid outlet of the cold flow channel 9 with the liquid inlet of the first heating flow channel 81, and the liquid inlet of the cold flow channel 9 is connected to a water source. The second transition chamber 19 connects the liquid outlet of the first heating flow channel 81 with the liquid inlet of the hot flow channel 10. The first transition chamber 18 and the second transition chamber 19 are arranged on the first end cover 2, or the first transition chamber 18 and the second transition chamber 19 are arranged on the second end cover 3, or one of the first transition chamber 18 and the second transition chamber 19 is arranged on the first end cover 2, and the other of the first transition chamber 18 and the second transition chamber 19 is arranged on the second end cover 3.

[0048] When the device is working, the liquid enters the first heating flow channel 81 of the first electric heating element 8 through the cold flow channel 9 of the heat exchange element 7. The liquid is heated and sterilized by the first electric heating element 8, and then enters the hot flow channel 10 of the heat exchange element 7 and is discharged. The heated liquid is cooled after heat exchange between the cold flow channel 9 and the hot flow channel 10 of the heat exchange element 7, so that the temperature of the discharged liquid is reduced, which is convenient for drinking. The first electric heating element 8 and the heat exchange element 7 of the device are integrated together through the first end cover 2 and the second end cover 3, so that the overall structure is more compact. The first transition cavity 18 and / or the second transition cavity 19 are set in the first end cover 2 and the second end cover 3. The first electric heating element 8 and the heat exchange element 7 are connected through the first end cover 2 and the second end cover 3, which reduces the use of connecting pipes, makes the structure more compact, and reduces the difficulty of assembly.

[0049] refer to Figure 4 , Figure 7 The first electric heating element 8 includes at least two first electric heating tubes 82, the first end cover 2 has a third connecting cavity 17, and / or the second end cover 3 has a third connecting cavity 17, and the plurality of first electric heating tubes 82 are connected in series and / or in parallel through the third connecting cavity 17. The plurality of first electric heating tubes 82 are connected in series or in parallel to improve the heating efficiency and heating power, so that the liquid is heated faster, and the third connecting cavity 17 is also integrated in the first end cover 2 and / or the second end cover 3, which is convenient for assembly and has a simpler structure;

[0050] refer to Figure 3-Figure 7 , and / or the heat exchange element 7 includes at least two groups of heat exchange tube groups, each group of heat exchange tube groups includes a first tube body 11 and a second tube body 12 that are sleeved. As an embodiment, the first tube body 11 and the second tube body 12 can be coaxially sleeved together, a cold runner 9 is provided between the inner wall of the first tube body 11 and the outer wall of the second tube body 12, and a hot runner 10 is provided on the inner wall of the second tube body 12. The first end cover 2 has a first connecting cavity 15 and / or a second connecting cavity 16, and / or the second end cover 3 has a first connecting cavity 15 and / or a second connecting cavity 16. The cold runners of the plurality of heat exchange tube groups The flow channels 9 are connected in series and / or in parallel through the first connecting cavity 15, and the hot flow channels 10 of the multiple heat exchange tube groups are connected in series and / or in parallel through the second connecting cavity 16. The heat exchange efficiency is improved by using multiple groups of heat exchange tube groups to quickly cool down the heated liquid. In addition, the multiple cold flow channels 9 and the multiple hot flow channels 10 are connected through the first end cover 2 having the first connecting cavity 15 and / or the second connecting cavity 16, and / or the second end cover 3 having the first connecting cavity 15 and / or the second connecting cavity 16, thereby reducing the difficulty of connecting the multiple first tube bodies 11 and the multiple second tube bodies 12.

[0051] refer to Figure 1 , Figure 6-Figure 12As an embodiment, the first end cover 2 includes a first cover shell 24, a second cover shell 25, and a third cover shell 26. A first connecting cavity 15 and / or a third connecting cavity 17 and / or a first transition cavity 18 are formed between the first cover shell 24 and the second cover shell 25; a second connecting cavity 16 and / or a second transition cavity 19 are formed between the second cover shell 25 and the third cover shell 26; Figure 6-Figure 8 , the first cover shell 24, the second cover shell 25, and the third cover shell 26 are provided with corresponding grooves, and when the multiple cover shells are combined together, the first connecting cavity 15 and / or the third connecting cavity 17 and / or the first transition cavity 18 are formed, which reduces the difficulty of later assembly and reduces the number of parts;

[0052] refer to Figure 10-12 , and / or the second end cover 3 includes a fourth cover shell 27, a fifth cover shell 28, and a sixth cover shell 29, and a first connecting cavity 15 and / or a third connecting cavity 17 and / or a first transition cavity 18 are formed between the fourth cover shell 27 and the fifth cover shell 28; a second connecting cavity 16 and / or a second transition cavity 19 are formed between the fifth cover shell 28 and the sixth cover shell 29, and corresponding groove cavities are set on the fourth cover shell 27, the fifth cover shell 28, and the sixth cover shell 29. When multiple cover shells are combined together, a first connecting cavity 15 and / or a third connecting cavity 17 and / or a first transition cavity 18 are formed, which reduces the difficulty of later assembly and makes fewer parts.

[0053] As an embodiment, the first cover shell 24, the second cover shell 25, and the third cover shell 26 are stacked in sequence along the axial direction of the first electric heating element 8, the first cover shell 24 is located on the side of the second cover shell 25 close to the first electric heating element 8, and the third cover shell 26 is located on the side of the second cover shell 25 away from the first electric heating element 8; and / or the fourth cover shell 27, the fifth cover shell 28, and the sixth cover shell 29 are stacked in sequence along the axial direction of the first electric heating element 8, the fourth cover shell 27 is located on the side of the fifth cover shell 28 close to the first electric heating element 8, and the sixth cover shell 29 is located on the side of the fifth cover shell 28 away from the first electric heating element 8. The first cover shell 24, the second cover shell 25, the third cover shell 26, the fourth cover shell 27, the fifth cover shell 28, and the sixth cover shell 29 are stacked and assembled along the axial direction of the electric heating tube, which is simple and convenient to assemble, and because it is assembled in one direction, it is easy to realize automatic assembly. In order to improve the sealing performance, a sealing structure, such as a sealing sleeve, a sealing ring and other parts, is installed between adjacent cover shells and cover shells and the electric heating tube and the heat exchange tube body.

[0054] The heating device comprises a shell 1 , a first end cover 2 fixed at one end of the shell 1 , a second end cover 3 fixed at the other end of the shell 1 , a heat exchange element 7 at least partially located inside the shell 1 , and a first electric heating element 8 at least partially located inside the shell 1 .

[0055] Specifically, the heat exchange element 7, the first electric heating element 8, and the second electric heating element 20 are placed on the inner side of the shell 1, and the first cover shell 24, the second cover shell 25, the third cover shell 26, the fourth cover shell 27, the fifth cover shell 28, and the sixth cover shell 29 are assembled together in sequence, and finally the first end cover 2 and the second end cover 3 are fixed to the shell 1 to complete the fixed assembly of the entire device.

[0056] refer to Figure 13-Figure 20 The heating device includes a second electric heating element 20, the second electric heating element 20 has a second heating channel 201, the first end cover 2 has a third transition cavity, and / or the second end cover 3 has a third transition cavity, the liquid outlet end of the hot runner 10 is connected with the liquid inlet end of the second heating channel 201 through the third transition cavity, and the liquid discharged from the hot runner 10 is heated for a second time by the second electric heating element 20 so that the liquid reaches the temperature required by the user.

[0057] In order to improve the heating efficiency, the second electric heating element 20 includes at least two second electric heating tubes 202, the first end cover 2 has a fourth communication cavity 22, and / or the second end cover 3 has a fourth communication cavity 22, and the plurality of second electric heating tubes 202 are connected in series and / or in parallel through the fourth communication cavity 22. This structure is easy to assemble and has a more compact structure.

[0058] refer to Fig.15 , Fig.17 , Fig. 20 , and / or the heating device includes a reversing tube 23, the third transition chamber includes a third transition chamber I 211 and a third transition chamber II 212, the first end cover 2 is provided with a third transition chamber I 211, and the second end cover 3 is provided with a third transition chamber II 212, one end of the reversing tube 23 is connected with the liquid outlet end of the hot runner 10 through the third transition chamber I 211, and the other end of the reversing tube 23 is connected with the liquid inlet end of the second heating flow channel 201 through the third transition chamber II 212, and the reversing tube 23 is provided, so that the discharge direction of the second electric heating element 20 can be changed, and whether the reversing tube 23 needs to change the discharge direction can be determined according to actual needs.

[0059] Several thermostats 4 are mounted on the housing 1, such as self-reset thermostats or mechanical reset thermostats, to achieve high-temperature power-off;

[0060] and / or a first temperature sensor 13 is provided between the liquid outlet of the cold flow channel 9 and the liquid inlet of the first heating flow channel 81;

[0061] And / or a second temperature sensor 14 is provided between the liquid outlet of the first heating channel 81 and the liquid inlet of the hot runner 10 .

[0062] The heating device comprises a water storage container and a water pump, wherein the liquid inlet of the water pump is connected to the water storage container, and the liquid outlet of the water pump is connected to the liquid inlet of the cold flow channel 9;

[0063] and / or a third temperature sensor 30 is provided between the liquid outlet of the hot runner 10 and the liquid inlet of the second heating runner 201;

[0064] And / or a fourth temperature sensor 31 is provided at the liquid outlet of the second heating channel 201 .

[0065] The water pump, the thermostat 4, the first temperature sensor 13, the second temperature sensor 14, the third temperature sensor 30, and the fourth temperature sensor 31 can be connected to the control board, the first temperature sensor 13 is used to detect the temperature of the liquid before entering the first heating flow channel 81, the second temperature sensor 14 is used to detect the temperature of the liquid discharged from the first heating flow channel 81, the third temperature sensor 30 is used to detect the temperature of the liquid before entering the second heating flow channel 201, and the fourth temperature sensor 31 is used to detect the final discharge temperature;

[0066] As an implementation mode, the liquid in the water storage container is transported to the downstream flow channel by a water pump, and the liquid passes through the cold flow channel 9, the first heating flow channel 81, the hot flow channel 10, and the second heating flow channel 201 in sequence. The liquid is heated to healthy water, for example, 90-100°C, when passing through the first heating flow channel 81, and then exchanges heat with the cold flow channel 9 when passing through the hot flow channel 10. After the liquid is cooled in the hot flow channel 10, it enters the second heating flow channel 201, and is heated a second time through the second heating flow channel 201 to warm healthy water that can be drunk directly. In this way, healthy water that can be drunk directly is obtained.

[0067] refer to Fig.21 The heating device includes a liquid inlet 5, a liquid outlet 6, and a reversing valve, such as an electromagnetic reversing valve. The reversing valve has a first liquid inlet, a first liquid outlet, and a second liquid outlet. The liquid outlet of the water pump is connected to the liquid inlet of the cold runner 9 through the liquid inlet 5, and the liquid outlet of the hot runner 10 is connected to the first liquid inlet of the reversing valve. The first liquid outlet of the reversing valve is connected to the water storage container, and the second liquid outlet of the reversing valve is connected to the liquid inlet of the second heating runner 201. The liquid outlet of the second heating runner 201 is connected to the liquid outlet 6.

[0068] When the system is working for the first time, it is necessary to wait for the water temperature of the hot runner 10 in the heat exchanger to rise before the first electric heating element 8 can stably discharge boiling water. If the water is directly discharged by heating in the cold state, the outlet water temperature of the heat exchanger will be unstable, thereby causing the outlet water temperature of the system to fluctuate. Therefore, a reversing valve is added to the water circuit. When the outlet water temperature of the first electric heating element 8 does not reach the boiling temperature, the electromagnetic reversing valve switches to the water circuit connected to the water storage container. At this time, the unboiled water will flow back to the water storage container. When the second temperature sensor 14 outlet water NTC monitors that the water temperature has reached the boiling temperature, after a period of time (determined by the length of the water circuit and the flow rate of the water pump to ensure that all unboiled water is returned to the water tank), the electromagnetic reversing valve switches to the outlet water circuit. At this time, the outlet temperature of the heat exchanger is stable, thereby ensuring the stability of the outlet temperature of the system.

[0069] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technical solution, concept, and design obtained by equivalent replacement or change based on the technical solution and utility model concept of the utility model by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model.

Claims

1. A heating device, characterized in that: The invention comprises a first electric heating element (8), a heat exchange element (7), a first end cover (2), a second end cover (3), a first transition chamber (18), and a second transition chamber (19); the first electric heating element (8) has a first heating flow channel (81); the heat exchange element (7) has a cold flow channel (9) and a hot flow channel (10); the first transition chamber (18) connects the liquid outlet of the cold flow channel (9) with the liquid inlet of the first heating flow channel (81); the liquid inlet of the cold flow channel (9) is connected to a water source; and the second transition chamber (19) connects the liquid outlet of the first heating flow channel (81) with the liquid inlet of the hot flow channel (10); The first transition chamber (18) and the second transition chamber (19) are arranged on the first end cover (2), or the first transition chamber (18) and the second transition chamber (19) are arranged on the second end cover (3), or one of the first transition chamber (18) and the second transition chamber (19) is arranged on the first end cover (2), and the other of the first transition chamber (18) and the second transition chamber (19) is arranged on the second end cover (3).

2. A heating device according to claim 1, characterized in that: The first electric heating element (8) comprises at least two first electric heating tubes (82), the first end cover (2) has a third connecting cavity (17), and / or the second end cover (3) has a third connecting cavity (17), and a plurality of the first electric heating tubes (82) are connected in series and / or in parallel via the third connecting cavity (17); And / or the heat exchange element (7) comprises at least two groups of heat exchange tube groups, each group of the heat exchange tube groups comprises a first tube body (11) and a second tube body (12) which are sleeved together, the cold flow channel (9) is provided between the inner wall of the first tube body (11) and the outer wall of the second tube body (12), the inner wall of the second tube body (12) is provided with the hot flow channel (10), the first end cover (2) has a first connecting cavity (15) and / or a second connecting cavity (16), and / or the second end cover (3) has a first connecting cavity (15) and / or a second connecting cavity (16), the cold flow channels (9) of the plurality of heat exchange tube groups are connected in series and / or in parallel through the first connecting cavity (15), and the hot flow channels (10) of the plurality of heat exchange tube groups are connected in series and / or in parallel through the second connecting cavity (16).

3. A heating device according to claim 2, characterized in that: The first end cover (2) comprises a first cover shell (24), a second cover shell (25), and a third cover shell (26); a first connecting cavity (15) and / or a third connecting cavity (17) and / or a first transition cavity (18) are formed between the first cover shell (24) and the second cover shell (25); a second connecting cavity (16) and / or a second transition cavity (19) are formed between the second cover shell (25) and the third cover shell (26); And / or the second end cover (3) includes a fourth cover shell (27), a fifth cover shell (28), and a sixth cover shell (29); a first connecting cavity (15) and / or a third connecting cavity (17) and / or a first transition cavity (18) are formed between the fourth cover shell (27) and the fifth cover shell (28); a second connecting cavity (16) and / or a second transition cavity (19) are formed between the fifth cover shell (28) and the sixth cover shell (29).

4. A heating device according to claim 3, characterized in that: The first cover shell (24), the second cover shell (25), and the third cover shell (26) are stacked in sequence along the axial direction of the first electric heating element (8); the first cover shell (24) is located on a side of the second cover shell (25) close to the first electric heating element (8), and the third cover shell (26) is located on a side of the second cover shell (25) far from the first electric heating element (8); And / or the fourth cover shell (27), the fifth cover shell (28), and the sixth cover shell (29) are stacked in sequence along the axial direction of the first electric heating element (8), the fourth cover shell (27) is located on a side of the fifth cover shell (28) close to the first electric heating element (8), and the sixth cover shell (29) is located on a side of the fifth cover shell (28) away from the first electric heating element (8).

5. A heating device according to any one of claims 1 to 4, characterized in that: The heating device comprises a shell (1), the first end cover (2) is fixed to one end of the shell (1), the second end cover (3) is fixed to the other end of the shell (1), the heat exchange element (7) is at least partially located on the inner side of the shell (1), and the first electric heating element (8) is at least partially located on the inner side of the shell (1).

6. A heating device according to claim 5, characterized in that: A plurality of temperature controllers (4) are installed on the housing (1); and / or a first temperature sensor (13) is arranged between the liquid outlet of the cold flow channel (9) and the liquid inlet of the first heating flow channel (81); And / or a second temperature sensor (14) is provided between the liquid outlet of the first heating channel (81) and the liquid inlet of the hot channel (10).

7. A heating device according to any one of claims 1 to 4 and 6, characterized in that: The heating device comprises a second electric heating element (20), the second electric heating element (20) has a second heating flow channel (201), the first end cover (2) has a third transition cavity, and / or the second end cover (3) has a third transition cavity, and the liquid outlet end of the hot flow channel (10) is connected to the liquid inlet end of the second heating flow channel (201) through the third transition cavity.

8. A heating device according to claim 7, characterized in that: The second electric heating element (20) comprises at least two second electric heating tubes (202); the first end cover (2) has a fourth connecting cavity (22); and / or the second end cover (3) has a fourth connecting cavity (22); a plurality of the second electric heating tubes (202) are connected in series and / or in parallel via the fourth connecting cavity (22); And / or the heating device includes a reversing tube (23), the third transition chamber includes a third transition chamber I (211) and a third transition chamber II (212), the first end cover (2) is provided with a third transition chamber I (211), the second end cover (3) is provided with a third transition chamber II (212), one end of the reversing tube (23) is connected to the liquid outlet of the hot runner (10) through the third transition chamber I (211), and the other end of the reversing tube (23) is connected to the liquid inlet of the second heating runner (201) through the third transition chamber II (212).

9. A heating device according to claim 7, characterized in that: The heating device comprises a water storage container and a water pump, wherein the liquid inlet end of the water pump is connected to the water storage container, and the liquid outlet end of the water pump is connected to the liquid inlet end of the cold flow channel (9); and / or a third temperature sensor (30) is provided between the liquid outlet of the hot runner (10) and the liquid inlet of the second heating runner (201); And / or a fourth temperature sensor (31) is provided at the liquid outlet of the second heating flow channel (201).

10. A heating device according to claim 9, characterized in that: The heating device comprises a liquid inlet (5), a liquid outlet (6), and a reversing valve, wherein the reversing valve has a first liquid inlet, a first liquid outlet, and a second liquid outlet, the liquid outlet end of the water pump is connected to the liquid inlet end of the cold flow channel (9) through the liquid inlet (5), the liquid outlet end of the hot flow channel (10) is connected to the first liquid inlet of the reversing valve, the first liquid outlet of the reversing valve is connected to a water storage container, the second liquid outlet of the reversing valve is connected to the liquid inlet end of the second heating flow channel (201), and the liquid outlet end of the second heating flow channel (201) is connected to the liquid outlet (6).

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