Immersed heating device

Abstract

The utility model relates to an immersed heating device, which comprises an upper heating seat provided with an upper cavity, a water inlet pipe and a water outlet pipe communicated with the upper cavity, and an upper roundabout flow channel arranged in the upper cavity and enabling two ends of the upper roundabout flow channel to be respectively communicated with the water inlet pipe and the water outlet pipe; the lower heating seat is arranged on the upper heating seat, the lower heating seat is provided with a lower cavity opposite to the upper cavity and a lower roundabout flow channel arranged in the lower cavity, and two ends of the lower roundabout flow channel are respectively communicated with the water inlet pipe and the water outlet pipe; the heating plate is arranged between the upper cavity and the lower cavity, the end of the heating plate abuts against the end of the water inlet pipe and the end of the water outlet pipe, so that liquid enters the upper roundabout flow channel and the lower roundabout flow channel from the water inlet pipe and then flows out through the water outlet pipe, and the heating plate heats the liquid in the upper roundabout flow channel and the lower roundabout flow channel. According to the heating device, the heating plate is wrapped in the upper roundabout flow channel and the lower roundabout flow channel, so that the heating plate is immersed in liquid, the heat loss is small, the temperature of the heating plate is effectively reduced, the service life of the heating plate is prolonged, and the structure is compact.

Description

Technical Field

[0001] The utility model relates to an automobile heating device, in particular to an immersion heating device. Background Art

[0002] Heaters used for heating electric vehicles mainly use a flat plate structure to heat the liquid in the flow channel. For example, CN111536690A discloses an automobile liquid heater, in which the liquid heating flow channel is U-shaped, and a heating substrate is provided on the top of the heating flow channel to heat the liquid in the heating flow channel.

[0003] Although the U-shaped flow channel has a simple structure, the liquid flow time is short and the contact area with the heating substrate is limited, resulting in insufficient heat exchange and low heat exchange efficiency. Although the efficiency of heat conduction can be improved by using heat sinks, the heat sink structure and process are complex and the cost is high.

[0004] In addition, since only the lower surface of the heating substrate heats the liquid, the heat generated on the upper surface of the heating substrate is directly dissipated and cannot be effectively utilized, resulting in a large heat loss. Utility Model Content

[0005] In order to solve the above problems of low heat exchange efficiency, high cost and large heat loss, the utility model provides an immersion heating device, and the specific technical solution is as follows:

[0006] and a tube connecting the discharging opening of the heating unit and the device for discharging the heat from the outlet to the outlet, wherein the end of the tube connecting the discharging opening and the outlet is connected with the feed pipe of the electric heating apparatus and the like.

[0007] Preferably, the upper circuitous flow channel includes several upper guide parts, which are staggered at both ends of the upper cavity so that the liquid flows back and forth at both ends of the upper cavity; the lower circuitous flow channel includes several lower guide parts, which are staggered at both ends of the lower cavity so that the liquid flows back and forth at both ends of the lower cavity.

[0008] Preferably, a plurality of upper turbulent flow parts for causing turbulent flow of the liquid are provided in the upper circuitous flow channel; and a plurality of lower flow blocking parts for causing turbulent flow of the liquid are provided in the lower circuitous flow channel.

[0009] Furthermore, the structure of the upper guide portion is the same as that of the lower guide portion, and the upper guide portion includes: a first upper guide plate, one end of the first upper guide plate is arranged at the first end of the upper cavity, a channel is left between the other end of the first upper guide plate and the second end of the upper cavity arranged opposite to the first end, and the first upper guide plate is also located on one side of the water inlet pipe; a second upper guide plate, one end of the second upper guide plate is arranged at the second end, a channel is left between the other end of the second upper guide plate and the first end; and a third upper guide plate. Plate, one end of the third upper guide plate is arranged at the first end, a channel is left between the other end of the third guide plate and the second end, and the third upper guide plate is also located at one end of the outlet pipe; wherein, the water inlet pipe and the water outlet pipe are located on both sides of the first end, and the second upper guide plate is located between the first upper guide plate and the third upper guide plate; the first upper guide plate, the second upper guide plate and the third upper guide plate and the two sides of the upper cavity form an upper circuitous flow channel in the upper cavity, the two ends of which are respectively connected to the water inlet pipe and the water outlet pipe.

[0010] In which, the structure of the upper turbulent part is the same as that of the lower turbulent part, and the upper turbulent part includes: a plurality of straight turbulent plates, which are arranged on both sides of the upper circuitous flow channel and are staggered in the direction of liquid flow; and a plurality of turning turbulent plates, which are arranged at the ends of the first upper guide plate, the second upper guide plate and the third upper guide plate, and the turning turbulent plates are used to change the flow direction of the liquid.

[0011] Furthermore, the structure of the upper guide portion is the same as that of the lower guide portion, and the upper guide portion includes: two fourth upper guide plates, one end of the fourth upper guide plate is arranged at the first end of the upper cavity, and a channel is left between the other end of the fourth upper guide plate and the second end of the upper cavity arranged opposite to the first end, and the two fourth upper guide plates are also respectively located on one side of the water inlet pipe and the water outlet pipe; two fifth upper guide plates, the fifth upper guide plate is symmetrically arranged in the upper cavity, one end of the fifth upper guide plate is arranged at the second end, and the other end of the fifth guide plate is aligned with the first end A channel is left between the two fifth upper guide plates, and the two said fifth upper guide plates are also located between the two said fourth upper guide plates; and a sixth upper guide plate, one end of the said sixth upper guide plate is arranged at the first end, and a channel is left between the other end of the said sixth upper guide plate and the second end, and the said sixth guide plate is also located between the two said fifth guide plates; wherein, the water inlet pipe and the water outlet pipe are located on both sides of one end of the said upper cavity; the fourth upper guide plate, the fifth upper guide plate and the sixth guide plate and the two sides of the said upper cavity form an upper circuitous flow channel in the said upper cavity, the two ends of which are respectively connected to the water inlet pipe and the water outlet pipe.

[0012] Preferably, the structure of the upper turbulent portion is the same as that of the lower turbulent portion, and the upper turbulent portion includes: a first upper turbulent plate, which is arranged on both sides of the other end of the fourth upper guide plate; a second upper turbulent plate, which is arranged on both sides of the other end of the fifth upper guide plate; and a third upper turbulent plate, which is arranged on both sides of the other end of the sixth upper guide plate.

[0013] Wherein, the first upper turbulent plate has a first inclined surface at one end away from the fourth upper guide plate; the second upper turbulent plate has a second inclined surface at one end away from the fifth upper guide plate; and the third upper turbulent plate has a third inclined surface at one end away from the sixth upper road plate.

[0014] Preferably, the upper circuitous flow channel and the lower circuitous flow channel are arranged in a mirror image.

[0015] Preferably, a confluence groove is provided on one side of the end portion of the heating plate, and the confluence groove is communicated with the water outlet pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The utility model provides an immersion heating device which covers a heating plate in two upper and lower circuitous flow channels, so that the heating plate is immersed in the liquid, which reduces heat loss, effectively reduces the temperature of the heating plate, increases the service life of the heating plate, reduces costs, and makes the overall structure more compact. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is an exploded view of Example 1;

[0019] Figure 2 is a schematic structural diagram of Example 1;

[0020] Figure 3 is a cross-sectional view of Example 1;

[0021] Figure 4 This is a schematic diagram of the structure of Example 1 after the lower heating seat is hidden;

[0022] Figure 5 is a three-dimensional diagram of the upper heating seat of Example 1 from a first viewing angle;

[0023] Figure 6 is a front view of the upper heating seat of Example 1;

[0024] Figure 7 1 is a schematic structural diagram of the lower heating seat of Example 1;

[0025] Figure 8 is a front view of the lower heating seat of Example 1;

[0026] Figure 9 is a schematic structural diagram of Example 2;

[0027] Figure 10 This is a schematic diagram of the structure of Example 2 after the lower heating seat is hidden;

[0028] Figure 11 2 is a schematic structural diagram of the upper heating seat of Example 2;

[0029] Figure 12 is a front view of the upper heating seat of Example 2;

[0030] Figure 13 2 is a schematic structural diagram of the lower heating seat of Example 2;

[0031] Figure 14 Schematic diagram of the structure of the heating plate of Example 2. DETAILED DESCRIPTION

[0032] The present invention will now be further described with reference to the accompanying drawings.

[0033] like Figures 1 to 14As shown, an immersion heating device includes a heating plate 3, an upper heating seat 1 and a lower heating seat 2. The bottom of the upper heating seat 1 is provided with an upper cavity 16, a water inlet pipe 11 and a water outlet pipe 12 communicating with the upper cavity 16, and an upper circuitous flow channel 13 disposed in the upper cavity 16 and forming an upper cavity 16 with two ends communicating with the water inlet pipe 11 and the water outlet pipe 12; the lower heating seat 2 is fixed on the upper heating seat 1, and is provided with a lower cavity 26 disposed opposite to the upper cavity 16 and a lower cavity 26 disposed in the lower cavity 26 and forming an upper circuitous flow channel 13 in the upper cavity 16. A lower circuitous flow channel 23 is formed, the two ends of which are respectively connected to the water inlet pipe 11 and the water outlet pipe 12; the heating plate 3 is located between the upper cavity 16 and the cavity, and the end of the heating plate 3 is against the end of the water inlet pipe 11 and the water outlet pipe 12, so that the liquid enters the upper circuitous flow channel 13 and the lower circuitous flow channel 23 from the water inlet pipe 11 and then flows out through the water outlet pipe 12, and the heating plate 3 heats the liquid in the upper circuitous flow channel 13 and the lower circuitous flow channel 23.

[0034] The heating plate 3 is an electric heating plate. Both surfaces of the heating plate 3 are in contact with the liquid, so that the heating plate 3 is immersed in the liquid. The liquid can fully absorb the heat of the heating plate 3, so that the heat loss of the heating plate 3 is small, which greatly improves the utilization rate of electric energy.

[0035] When heating on one side, the temperature of the heating plate 3 can reach 200-250°C. The high temperature places high demands on the heating plate 3 and the sealing ring, shortening the service life of the heating plate 3. The immersion structure adopted in this embodiment can reduce the temperature of the heating plate 3 to 120-150°C, greatly reducing the temperature of the heating plate 3, increasing the service life of the heating plate 3, and reducing the overall heat dissipation requirements of the heater.

[0036] The heating plate 3 includes a heating substrate and an electric heating layer 32 provided on the heating substrate. The heating substrate is a metal plate, usually a stainless steel plate. The heating plate 3 is a mature product and will not be described in detail here.

[0037] The upper circuitous flow channel 13 and the lower circuitous flow channel 23 increase the length of the liquid flow path, extend the heat exchange time of the liquid, and improve the heat exchange effect.

[0038] The upper heating seat 1 can be connected to the lower heating seat 2 by welding without using a sealing ring, thereby avoiding the risk of leakage caused by aging of the sealing ring and improving the sealing performance.

[0039] In order to improve the temperature uniformity of the heating plate 3, the upper circuitous flow channel 13 and the lower circuitous flow channel 23 are mirror-imaged. The mirror-imaged upper circuitous flow channel 13 and the lower circuitous flow channel 23 make the flow path of the liquid the same. Since the flow rate is basically the same, the mirror-imaged upper and lower flow channels can make the temperature of the two surfaces of the heating plate 3 consistent, avoiding the different temperatures of the upper and lower surfaces of the heating plate 3 affecting the life of the electric heating layer on the surface of the heating plate 3. The mirror-imaged upper and lower circuitous flow channels 13 and 23 make the temperature of the liquid above and below the heating plate 3 close to each other, avoiding a large temperature difference, thereby making the temperature consistency of the liquid flowing out after the liquid is heated and converges in the water outlet pipe 12 high, reducing temperature fluctuations and ensuring a stable and reliable air heating effect.

[0040] The upper circuitous flow channel 13 includes a plurality of upper guides staggered at both ends of the upper cavity 16, allowing liquid to flow back and forth between the two ends of the upper cavity 16. The lower circuitous flow channel 23 includes a plurality of lower guides staggered at both ends of the lower cavity 26, allowing liquid to flow back and forth between the two ends of the lower cavity 26. The structure of the upper guides is arranged in a mirror image of the structure of the lower guides.

[0041] To further improve heat exchange efficiency, upper circuitous flow channel 13 is provided with a plurality of upper turbulent flow sections for generating turbulent liquid flow, while lower circuitous flow channel 23 is provided with a plurality of lower turbulent flow sections for generating turbulent liquid flow. This turbulent liquid flow allows for sufficient contact with heating plate 3, thereby achieving sufficient heat exchange with the liquid, improving liquid temperature uniformity and heat exchange efficiency.

[0042] The water inlet pipe 11 and the water outlet pipe 12 are both located at the same end of the upper heating base 1, and are located on both sides of one end of the upper heating base 1, that is, on both sides of the same end of the upper cavity 16. The end of the upper cavity 16 that communicates with the water inlet pipe 11 and the water outlet pipe 12 is a first end 161, and the other end of the upper cavity 16 that is opposite to the first end 161 is a second end 162.

[0043] like Figures 1 to 8As shown, in Example 1, the upper guide portion and the lower guide portion are arranged in a mirror image, and the upper guide portion includes a first upper guide plate 131, a second upper guide plate 132, and a third upper guide plate 133. One end of the first upper guide plate 131 is arranged at the first end 161 of the upper cavity 16, and a first channel 1311 is left between the other end of the first upper guide plate 131 and the second end 162 of the upper cavity 16. The first upper guide plate 131 is also located on one side of the water inlet pipe 11; one end of the second upper guide plate 132 is arranged at the second end 162, and a second channel 1322 is left between the other end of the second upper guide plate 132 and the first end 161; the third upper guide plate 133 is provided at the second end 162 of the water inlet pipe 11; One end is located at the first end 161, and a third channel 1333 is defined between the other end of the third upper guide plate 133 and the second end 162. The third upper guide plate 133 is also located at one end of the outlet pipe 12. The second upper guide plate 132 is located between the first and third upper guide plates 131, 133. The first, second, and third upper guide plates 131, 132, and 133 are alternately arranged at the first and second ends 161, 162 of the upper chamber 16. The first, second, and third upper guide plates 131, 132, and 133, together with both sides of the upper chamber 16, form an upper circuitous flow channel 13 within the upper chamber 16, the ends of which are in communication with the water inlet pipe 11 and the water outlet pipe 12, respectively. The liquid enters from the water inlet pipe 11, then enters the first channel 1311 through the flow channel formed by the first upper guide plate 131 and the side wall of the upper cavity 16, and then enters the second channel 1322 through the first channel 1311. The liquid enters the flow channel formed by the first upper guide plate 131 and the second upper guide plate 132 through the second channel 1322, and then enters the flow channel formed by the second upper guide plate 132 and the third upper guide plate 133 through the second channel 1322, and then enters the third channel 1333. Then the liquid enters the channel formed by the third upper guide plate 133 and the side wall of the upper cavity 16 through the third channel 1333, and finally flows out through the water outlet pipe 12, and the liquid flows in a circuitous manner between the first end 161 and the second end 162 of the upper cavity 16.

[0044] The upper turbulence section is arranged in a mirror image with the lower turbulence section. The upper turbulence section includes a plurality of straight turbulence plates and a plurality of curved turbulence plates. The straight turbulence plates are arranged on both sides of the upper detour channel 13 and are staggered in the direction of liquid flow. The curved turbulence plates are arranged at the ends of the first upper guide plate 131, the second upper guide plate 132, and the third upper guide plate 133. The curved turbulence plates are used to change the flow direction of the liquid. Specifically, the straight turbulence plates include a first straight turbulence plate 141, a second straight turbulence plate 142, and a third straight turbulence plate 144. The first straight turbulence plate 141 is arranged on one side of the first upper guide plate 131 and opposite the water inlet pipe 11. It is used to initially block the liquid entering the upper detour channel 13, causing the liquid to change its flow direction at the first straight turbulence plate 141, generating turbulence, achieving sufficient heat exchange, improving the internal temperature uniformity of the liquid, and enhancing heat exchange efficiency. The second straight turbulator 142 is arranged on the side of the upper cavity 16 opposite to the first upper guide plate 131. The second straight turbulator 142 and the first straight turbulator 141 are staggered in the direction of liquid flow, and the ends thereof intersect with each other to form a zigzag flow channel. The third straight turbulator 144 is vertically arranged at the second end 162 of the upper cavity 16 and is arranged opposite to the first upper guide plate 131. The turning turbulator is L-shaped and includes a first turning turbulator 143, a second turning turbulator 145, and a third turning turbulator 146. The first turning turbulator 143 is symmetrically arranged at the other end of the first upper guide plate 131, that is, located in the first channel 1311, while the third straight turbulator 144 is inserted between the two first turning turbulators 143, and the ends of the first turning turbulator 143 and the third straight turbulator 144 are intersected to form a zigzag channel. The second turning turbulator plate 145 is arranged at the other end of the second upper guide plate 132, that is, it is located in the second channel 1322, and is cross-arranged with the second turning turbulator plate 145 and the first turning turbulator plate 143 to form a tortuous channel. The third turning turbulator plate 146 is arranged between the third upper guide plate 133 and the first end 161 of the upper cavity 16, and is arranged opposite to the second turning turbulator plate 145 to form a tortuous channel. The outlet pipe 12 is arranged opposite to the third turning turbulator plate 146 to form a tortuous water outlet channel. The turbulent portion allows the liquid to fully generate turbulence in the tortuous flow channel, thereby performing effective heat exchange, improving the uniformity of the liquid temperature in the tortuous flow channel, and then improving the temperature uniformity of the heating plate 3, avoiding excessively high local temperature of the heating plate 3, and improving the stability and service life of the heating.

[0045] The heights of the straight turbulence plates and the curved turbulence plates are consistent with that of the upper guide plates, and both rest on the heating plate 3 .

[0046] The upper turbulent portion and the upper guide portion cooperate to form a more complex tortuous flow channel, which can not only extend the flow path of the liquid in the tortuous flow channel and prolong the heat exchange time, but also increase the turbulence of the liquid and achieve reliable heat exchange.

[0047] like Figure 8 As shown, the liquid enters through the water inlet pipe 11, then flows in a zigzag manner through the first straight turbulator plate 141, the second straight turbulator plate 142, the two first curved turbulator plates 143 and the third straight turbulator plate 144, the second curved turbulator plate 145 and the third curved turbulator plate 146, and finally flows out through the water outlet pipe 12.

[0048] like Figures 10 to 14 As shown, in Example 2, the structure of the upper guide portion is the same as that of the lower guide portion. The upper guide portion includes a fourth upper guide plate 134, a fifth upper guide plate 135 and a sixth upper guide plate 136. Two of the fourth upper guide plate 134 and the fifth upper guide plate 135 are symmetrically provided. One end of the fourth upper guide plate 134 is provided at the first end 161 of the upper cavity 16, and a fourth channel 1344 is left between the other end of the fourth upper guide plate 134 and the second end 162 of the upper cavity 16. The two fourth upper guide plates 134 are also respectively located on one side of the water inlet pipe 11 and the water outlet pipe 12; the fifth upper guide plate 135 is symmetrically provided in the upper cavity 16, one end of the fifth upper guide plate 135 is provided at the second end 162, and the other end of the fifth upper guide plate 135 is provided with a A fifth channel 1355 is provided between the first ends 161. The two fifth upper guide plates 135 are also located between the two fourth upper guide plates 134 and are staggered. A sixth upper guide plate 136 is provided. The sixth upper guide plate 136 is located on the centerline of the upper heating seat 1. One end of the sixth upper guide plate 136 is provided at the first end 161. A sixth flow channel 1366 is provided between the other end of the sixth upper guide plate 136 and the second end 162. The sixth upper guide plate 136 is also located between the two fifth upper guide plates 135. The fourth, fifth, and sixth upper guide plates 134, 135, and 136, together with the two sides of the upper cavity 16, form an upper circuitous flow channel 13 within the upper cavity 16, with its two ends communicating with the water inlet pipe 11 and the water outlet pipe 12, respectively. The sixth upper guide plate 136 divides the upper cavity 16 into two symmetrical cavities, forming two symmetrically arranged flow channels. The liquid enters the water inlet pipe 11, then enters the fourth channel 1344 through the flow channel formed by the fourth upper guide plate 134 and the side of the upper cavity 16, and then enters the fifth channel 1355 through the fourth channel 1344. The liquid enters the flow channel formed by the fourth upper guide plate 134 and the fifth upper guide plate 135 through the fifth channel 1355, and then enters the flow channel formed by the fifth upper guide plate 135 and the sixth upper guide plate 136 through the fifth channel 1355, and then enters the sixth channel. The liquid then enters the flow channel between the sixth upper guide plate 136 and the fifth upper guide plate 135 located on the side of the outlet pipe 12 through the sixth channel, passes through the remaining flow channels in turn, and finally flows out through the outlet pipe 12. The fourth upper guide plate 134, the fifth upper guide plate 135 and the sixth upper guide plate 136 form a circuitous flow channel.

[0049] The upper turbulence section is mirrored to the lower turbulence section and includes a first upper turbulence plate 191, a second upper turbulence plate 192, and a third upper turbulence plate 193. The first upper turbulence plate 191 is located on either side of the other end of the fourth upper guide plate 134 and is positioned within the fourth channel 1344. The two first upper turbulence plates 191 form a V-shape, with their ends respectively abutting the sidewalls of the upper chamber 16 and the sides of the fifth upper guide plate 135. The height of the first upper turbulence plate 191 is smaller than that of the fifth upper guide plate 135 to allow liquid to pass through. The second upper turbulence plates 192 are located on either side of the other end of the fifth upper guide plate 135 and are positioned within the fifth channel 1355. The two second upper turbulence plates 192 form a V-shape, with their ends respectively abutting the fourth upper guide plate 134 and the sixth upper guide plate 136. Third upper turbulators 193 are positioned on either side of the other end of the sixth upper guide plate 136. The two third upper turbulators 193 form a V-shape, with their ends resting against the fifth upper guide plates 135 on either side. The turbulators are smaller than the guide plates, allowing for easy passage of liquid. These turbulators create turbulent flow in the liquid, enabling efficient heat exchange and improving heat transfer efficiency.

[0050] Furthermore, a first inclined surface 1911 is provided at the end of the first upper turbulator 191 away from the fourth upper guide plate 134; a second inclined surface 1921 is provided at the end of the second upper turbulator 192 away from the fifth upper guide plate 135; and a third inclined surface 1931 is provided at the end of the third upper turbulator 193 away from the sixth upper guide plate 136. The first inclined surface 1911, the second inclined surface 1921, and the third inclined surface 1931 are all arranged to be inclined toward the bottom of the upper cavity 16. The first inclined surface 1911, the second inclined surface 1921, and the third inclined surface 1931 can increase the area of the flow channel, thereby increasing the flow rate at the outer bend of the flow channel, making the flow velocity uniform throughout the flow channel, ensuring uniform heat exchange of the heating plate 3, improving the temperature uniformity of the heating plate 3, and extending the service life of the heating plate 3.

[0051] like Figure 14As shown, a confluence groove 31 is provided on one side of the end of the heating plate 3, and the confluence groove 31 is connected to the water outlet pipe 12. When the electric heating layer 32 is only provided on one side of the heating plate 3, since the surface of the electric heating layer 32 is provided with an insulating layer, the thermal conductivity of the insulating layer is not as good as that of the heating substrate. Therefore, the temperature of the liquid in contact with the heating substrate is higher than the height of the liquid in contact with the insulating layer, resulting in a temperature difference between the liquids in the upper and lower layers of the heating plate 3. In order to improve the uniformity of the generated temperature, the confluence groove 31 is provided at the end of the heating plate 3, that is, the confluence groove 31 is provided on the heating substrate, and the electric heating layer 32 avoids the confluence groove 31. The confluence groove 31 is directly connected to the water outlet pipe 12, so that the liquids in the upper and lower layers of the heating plate 3 are mixed in the confluence groove 31 and then flow out, thereby improving the uniformity of the temperature of the liquid out of the water outlet pipe 12 and improving the accuracy of the water outlet temperature detection. A temperature sensor is installed in the water outlet pipe 12, which is used to detect the water outlet temperature, thereby improving the control accuracy of the heating.

[0052] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and should not be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will be able to devise other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the claims of the present invention.

Claims

1. An immersion heating device, characterized in that: include: The upper heating seat (1) is provided with an upper cavity (16), a water inlet pipe (11) and a water outlet pipe (12) communicating with the upper cavity (16), and an upper circuitous flow channel (13) disposed in the upper cavity (16) and forming an upper cavity (16) with two ends communicating with the water inlet pipe (11) and the water outlet pipe (12) respectively. A lower heating seat (2) is provided on the upper heating seat (1), and the lower heating seat (2) is provided with a lower cavity (26) arranged opposite to the upper cavity (16) and a lower circuitous flow channel (23) provided in the lower cavity (26) and forming a lower cavity (26) with two ends communicating with the water inlet pipe (11) and the water outlet pipe (12) respectively; as well as A heating plate (3) is provided between the upper cavity (16) and the lower cavity (26), with the end of the heating plate (3) abutting against the end of the water inlet pipe (11) and the end of the water outlet pipe (12), so that liquid enters the upper circuitous flow channel (13) and the lower circuitous flow channel (23) from the water inlet pipe (11) and then flows out through the water outlet pipe (12), and the heating plate (3) heats the liquid in the upper circuitous flow channel (13) and the lower circuitous flow channel (23).

2. An immersion heating device according to claim 1, characterized in that; The upper circuitous flow channel (13) includes a plurality of upper flow guides, which are staggeredly arranged at both ends of the upper cavity (16) to allow the liquid to flow back and forth at both ends of the upper cavity (16); The lower circuitous flow channel (23) comprises a plurality of lower flow guides, which are staggeredly arranged at both ends of the lower cavity (26) so that the liquid flows back and forth at both ends of the lower cavity (26).

3. An immersion heating device according to claim 2, characterized in that; The upper circuitous flow channel (13) is provided with a plurality of upper turbulent flow portions for causing the liquid to generate turbulent flow; The lower circuitous flow channel (23) is provided with a plurality of lower turbulent flow portions for causing the liquid to generate turbulent flow.

4. The immersion heating device according to claim 3, characterized in that: The structure of the upper guide portion is the same as that of the lower guide portion, and the upper guide portion includes: a first upper guide plate (131), one end of the first upper guide plate (131) being arranged at a first end (161) of the upper cavity (16), a passage being left between the other end of the first upper guide plate (131) and a second end (162) of the upper cavity (16) being arranged opposite to the first end (161), and the first upper guide plate (131) being further arranged on one side of the water inlet pipe (11); a second upper guide plate (132), one end of the second upper guide plate (132) being disposed at the second end (162), and a passage being left between the other end of the second upper guide plate (132) and the first end (161); and a third upper guide plate (133), one end of the third upper guide plate (133) being arranged at the first end (161), a passage being left between the other end of the third upper guide plate (133) and the second end (162), and the third upper guide plate (133) being also located at one end of the water outlet pipe (12); The water inlet pipe (11) and the water outlet pipe (12) are located on both sides of the first end (161), and the second upper guide plate (132) is located between the first upper guide plate (131) and the third upper guide plate (133); The first upper guide plate (131), the second upper guide plate (132) and the third upper guide plate (133) and the two sides of the upper cavity (16) form an upper circuitous flow channel (13) in the upper cavity (16), the two ends of which are respectively connected to the water inlet pipe (11) and the water outlet pipe (12).

5. The immersion heating device according to claim 4, characterized in that: The structure of the upper turbulent part is the same as that of the lower turbulent part, and the upper turbulent part includes: a plurality of straight turbulence plates, the plurality of straight turbulence plates being arranged on both sides of the upper circuitous flow channel (13) and being staggered in the direction of liquid flow; and A plurality of turning turbulent plates are provided at the ends of the first upper guide plate (131), the second upper guide plate (132) and the third upper guide plate (133), and the turning turbulent plates are used to change the flow direction of the liquid.

6. The immersion heating device according to claim 3, characterized in that: The structure of the upper guide portion is the same as that of the lower guide portion, and the upper guide portion includes: Two fourth upper guide plates (134), one end of each of the fourth upper guide plates (134) being disposed at a first end (161) of the upper cavity (16), a passage being left between the other end of each of the fourth upper guide plates (134) and a second end (162) of the upper cavity (16) disposed opposite to the first end (161), and the two fourth upper guide plates (134) being respectively located on one side of the water inlet pipe (11) and the water outlet pipe (12); Two fifth upper guide plates (135), the fifth upper guide plates (135) being symmetrically arranged in the upper cavity (16), one end of the fifth upper guide plate (135) being arranged at the second end (162), a channel being left between the other end of the fifth upper guide plate (135) and the first end (161), and the two fifth upper guide plates (135) being further located between the two fourth upper guide plates (134); and a sixth upper guide plate (136), one end of the sixth upper guide plate (136) being arranged at the first end (161), a channel being left between the other end of the sixth upper guide plate (136) and the second end (162), and the sixth upper guide plate (136) being further located between the two fifth upper guide plates (135); Wherein, the water inlet pipe (11) and the water outlet pipe (12) are located on both sides of one end of the upper cavity (16); The fourth upper guide plate (134), the fifth upper guide plate (135) and the sixth upper guide plate (136) and the two sides of the upper cavity (16) form an upper circuitous flow channel (13) in the upper cavity (16), the two ends of which are respectively connected to the water inlet pipe (11) and the water outlet pipe (12).

7. An immersion heating device according to claim 6, characterized in that: The structure of the upper turbulent part is the same as that of the lower turbulent part, and the upper turbulent part includes: a first upper turbulence plate (191), the first upper turbulence plate (191) being arranged on both sides of the other end of the fourth upper guide plate (134); a second upper turbulence plate (192), the second upper turbulence plate (192) being provided on both sides of the other end of the fifth upper guide plate (135); and A third upper turbulence plate (193) is provided on both sides of the other end of the sixth upper guide plate (136).

8. The immersion heating device according to claim 7, characterized in that: A first inclined surface (1911) is provided at one end of the first upper turbulent plate (191) away from the fourth upper guide plate (134); A second inclined surface (1921) is provided at one end of the second upper turbulent plate (192) away from the fifth upper guide plate (135); A third inclined surface (1931) is provided at one end of the third upper turbulent plate (193) away from the sixth upper guide plate (136).

9. An immersion heating device according to any one of claims 1 to 8, characterized in that: The upper circuitous flow channel (13) and the lower circuitous flow channel (23) are arranged in a mirror image.

10. An immersion heating device according to any one of claims 1 to 8, characterized in that: A confluence groove (31) is provided on one side of the end portion of the heating plate (3), and the confluence groove (31) is communicated with the water outlet pipe (12).

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