Immersion heater

Abstract

An immersion heater, comprising: an upper heating base (1), which is provided with an upper cavity (16), a water intake pipe (11) and a water output pipe (12) that are in communication with the upper cavity (16), and an upper serpentine flow channel (13) disposed in the upper cavity (16) and having two ends in communication with the water intake pipe (11) and the water output pipe (12), respectively; a lower heating base (2) disposed on the upper heating base (1), wherein the lower heating base (2) is provided with a lower cavity (26) disposed opposite the upper cavity (16) and a lower serpentine flow channel (23) formed in the lower cavity (26) and having two ends in communication with the water intake pipe (11) and the water output pipe (12), respectively; a heating plate (3) disposed between the upper cavity (16) and the lower cavity (26), wherein end portions of the heating plate (3) abut against end portions of the water intake pipe (11) and the water output pipe (12), such that liquid enters the upper serpentine flow channel (13) and the lower serpentine flow channel (23) from the water intake pipe (11) and flows out through the water output pipe (12), and the heating plate (3) heats the liquid in the upper serpentine flow channel (13) and the lower serpentine flow channel (23); a control board (4) disposed in a control groove (18) of the upper heating base (1) and connected to the heating plate (3); and an upper cover plate (5) disposed at the top of the control groove (18).

Description

An immersion heater Technical Field

[0001] This invention relates to an automotive air conditioning heater, and more particularly to an immersion heater. Background Technology

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

[0003] Although the U-shaped flow channel structure is simple, the short flow time of the liquid and the limited contact area with the heating substrate result in insufficient heat exchange and low heat transfer efficiency. While heat dissipation fins can improve heat transfer efficiency, their structure is complex, their manufacturing process is complicated, and their cost is high. Furthermore, 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 without being effectively utilized, resulting in significant heat loss. Technical issues

[0004] To solve the problems of low heat exchange efficiency, high cost, and large heat loss mentioned above. Technical solutions

[0005] This invention provides an immersion heater, the specific technical solution of which is as follows:

[0006] An immersion heater includes: an upper heating seat having an upper cavity, an inlet pipe and an outlet pipe communicating with the upper cavity, and an upper meandering flow channel disposed within the upper cavity, the upper cavity having two ends communicating with the inlet pipe and the outlet pipe respectively; and a lower heating seat disposed on the upper heating seat, the lower heating seat having a lower cavity disposed opposite to the upper cavity and a lower meandering flow channel disposed within the lower cavity, the lower cavity having two ends communicating with the inlet pipe and the outlet pipe respectively. A heating plate is disposed between the upper cavity and the lower cavity, with its end abutting against the ends of the inlet pipe and the outlet pipe, allowing liquid to enter the upper meandering channel and the lower meandering channel from the inlet pipe and then flow out through the outlet pipe. The heating plate heats the liquid in the upper meandering channel and the lower meandering channel. A control plate is disposed in the control slot of the upper heating seat and connected to the control plate. An upper cover plate is disposed on the top of the control slot.

[0007] Preferably, the upper meandering flow channel includes a plurality of upper guide sections, 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 meandering flow channel includes a plurality of lower guide sections, 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] Furthermore, the upper meandering channel is provided with a plurality of upper turbulent flow sections for generating turbulent flow in the liquid; the lower meandering channel is provided with a plurality of lower obstruction sections for generating turbulent flow in the liquid.

[0009] Furthermore, the structure of the upper guide section is the same as that of the lower guide section. The upper guide section includes: a first upper guide plate, one end of which is located at the first end of the upper cavity, and a channel is provided between the other end of the first upper guide plate and the second end of the upper cavity opposite to the first end; the first upper guide plate is also located on one side of the water inlet pipe; a second upper guide plate, one end of which is located at the second end, and a channel is provided between the other end of the second upper guide plate and the first end; and a third upper guide plate. The upper guide plate has one end located at the first end, and a channel is left between the other end of the third guide plate and the second end. The third upper guide plate is also located at one end of the outlet pipe. The inlet pipe and the 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, together with the sides of the upper cavity, form an upper meandering flow channel in the upper cavity, with both ends communicating with the inlet pipe and the outlet pipe, respectively.

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

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

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

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

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

[0015] Preferably, the upper heating base is provided with a plurality of wiring holes, and one end of the heating plate is provided with a plurality of wiring terminals. The wiring terminals are inserted into the wiring holes and connected to the control board. Beneficial effects

[0016] Compared with the prior art, the present invention has the following beneficial effects: The immersion heater provided by the present invention covers the heating plate in two meandering channels, so that the heating plate is immersed in the liquid, resulting in less heat loss, effectively reducing the temperature of the heating plate, improving the service life of the heating plate, reducing costs, and making the overall structure more compact. Attached Figure Description

[0017] Figure 1 is a structural schematic diagram of Embodiment 1;

[0018] Figure 2 is an exploded view of Example 1;

[0019] Figure 3 is a cross-sectional view of Example 1;

[0020] Figure 4 is a schematic diagram of the structure after the lower heating seat is hidden in Embodiment 1;

[0021] Figure 5 is a perspective view of the upper heating seat of Embodiment 1 from a first angle;

[0022] Figure 6 is a front view of the upper heating seat in Embodiment 1;

[0023] Figure 7 is a perspective view of the upper heating seat of Embodiment 1 from a second angle;

[0024] Figure 8 is a schematic diagram of the lower heating seat in Embodiment 1;

[0025] Figure 9 is a front view of the lower heating seat in Embodiment 1;

[0026] Figure 10 is a perspective view of Example 2 from the first viewpoint;

[0027] Figure 11 is a perspective view of Embodiment 2 from a second viewpoint;

[0028] Figure 12 is a schematic diagram of the structure after the lower heating seat is hidden in Embodiment 2;

[0029] Figure 13 is a schematic diagram of the upper heating seat in Embodiment 2;

[0030] Figure 14 is a front view of the upper heating seat in Embodiment 2;

[0031] Figure 15 is a schematic diagram of the lower heating seat in Embodiment 2;

[0032] Figure 16 is a schematic diagram of the heating plate in Example 2. The best embodiment of the present invention

[0033] The present invention will now be further described with reference to the accompanying drawings.

[0034] As shown in Figures 1 to 16, an immersion heater includes a heating plate 3, a control plate 4, an upper cover plate 5, an upper heating seat 1, and a lower heating seat 2. The top of the upper heating seat 1 is provided with a control groove 18. The bottom of the upper heating seat 1 is provided with an upper cavity 16, an inlet pipe 11 and an outlet pipe 12 communicating with the upper cavity 16, and an upper meandering flow channel 13 located within the upper cavity 16, forming an upper meandering flow channel with both ends communicating with the inlet pipe 11 and the outlet pipe 12 respectively. The lower heating seat 2 is fixed to the upper heating seat 1, and the lower heating seat 2 is provided with... The upper cavity 16 has a lower cavity 26 opposite to it, and a lower meandering flow channel 23 is formed within the lower cavity 26, with its two ends communicating with the inlet pipe 11 and the outlet pipe 12, respectively. A heating plate 3 is located between the upper cavity 16 and the lower cavity 26, with its end abutting against the ends of the inlet pipe 11 and the outlet pipe 12. This allows liquid to enter the upper meandering flow channel 13 and the lower meandering flow channel 23 from the inlet pipe 11 and then flow out through the outlet pipe 12. The heating plate 3 heats the liquid within the upper meandering flow channel 13 and the lower meandering flow channel 23. A control plate 4 is installed within a control tank 18, and a top cover plate 5 is installed on the top of the control tank 18, sealing the control tank 18.

[0035] The heating plate 3 is an electric heating plate. Both sides of the heating plate 3 are in contact with the liquid, thus immersing the heating plate 3 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 and the utilization rate of electrical energy is greatly improved.

[0036] When heating from one side, the temperature of the heating plate 3 can reach 200~250℃. High temperature places high demands on the heating plate 3 and the sealing ring, which shortens the service life of the heating plate 3. However, the immersion structure adopted in this embodiment can reduce the temperature of the heating plate 3 to 120~150℃, which greatly reduces the temperature of the heating plate 3, improves the service life of the heating plate 3, and also reduces the overall heat dissipation requirements of the heater.

[0037] The heating plate 3 includes a heating substrate and an electric heating layer 32 disposed on the heating substrate. The heating substrate is a metal plate, typically made of stainless steel. The heating plate 3 is a mature product and will not be described in detail here.

[0038] The upper meandering channel 13 and the lower meandering channel 23 increase the length of the liquid flow path, prolong the heat exchange time of the liquid, and improve the heat exchange effect.

[0039] The upper heating base 1 can be connected to the lower heating base 2 by welding, eliminating the need for a sealing ring, avoiding the risk of leakage due to aging of the sealing ring, and improving the sealing performance.

[0040] To facilitate the connection between the heating plate 3 and the control board 4 and ensure the reliability of the connection, one end of the upper heating base 1 is provided with several wiring holes 15, and one end of the heating plate 3 is provided with several wiring terminals 41. The wiring terminals 41 are inserted into the wiring holes 15 and connected to the control board 4. The upper heating base 1 is also provided with several sealing grooves, and a first sealing ring 42 is installed in the sealing groove. The sealing groove is coaxially arranged with the wiring holes 15, and the first sealing ring 42 achieves the sealing between the heating plate 3 and the upper heating base 1. To further improve the sealing performance, glue can also be poured into the wiring holes 15.

[0041] To improve the temperature uniformity of the heating plate 3, the upper meandering channel 13 and the lower meandering channel 23 are mirror images of each other. This mirrored arrangement ensures that the liquid flows along the same path, resulting in essentially the same flow velocity. Therefore, the mirrored upper and lower channels ensure that the temperatures on both sides of the heating plate 3 are consistent, preventing temperature differences between the upper and lower surfaces from affecting the lifespan of the electric heating layer on the surface of the heating plate 3. The mirrored arrangement of the upper meandering channel 13 and the lower meandering channel 23 also brings the temperatures of the liquid above and below the heating plate 3 closer, avoiding large temperature differences. This results in a higher temperature consistency of the liquid flowing out after converging at the outlet pipe 12, reducing temperature fluctuations and ensuring a stable and reliable air heating effect.

[0042] The upper meandering flow channel 13 includes several upper guide sections, which are staggered at both ends of the upper cavity 16, causing the liquid to flow back and forth between the two ends of the upper cavity 16. The lower meandering flow channel 23 includes several lower guide sections, which are staggered at both ends of the lower cavity 26, causing the liquid to flow back and forth between the two ends of the lower cavity 26. The structures of the upper guide sections and the lower guide sections are mirror images of each other.

[0043] To further improve heat exchange efficiency, the upper meandering channel 13 is provided with several upper turbulent flow sections to generate turbulence in the liquid; the lower meandering channel 23 is provided with several lower turbulent flow sections to generate turbulence in the liquid. After the liquid generates turbulence, it can fully contact the heating plate 3, thereby achieving sufficient heat exchange and improving the uniformity of liquid temperature and the heat exchange effect.

[0044] The inlet pipe 11 and the outlet pipe 12 are both located at the same end of the upper heating base 1, and 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 inlet pipe 11 and the outlet pipe 12 is the first end 161, and the other end of the upper cavity 16 that is opposite to the first end 161 is the second end 162.

[0045] As shown in Figures 1 to 9, in Embodiment 1, the upper and lower guide sections are mirror images of each other. The upper guide section 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 located 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 inlet pipe 11. One end of the second upper guide plate 132 is located 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... A third channel 1333 is provided between the other end of the third upper guide plate 133 and the second end 162, with one end located at the first end 161. 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 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 are alternately arranged at the first end 161 and the second end 162 of the upper cavity 16. The first upper guide plate 131, the second upper guide plate 132, and the third upper guide plate 133, together with the two sides of the upper cavity 16, form an upper meandering flow channel 13 in the upper cavity 16, with both ends communicating with the inlet pipe 11 and the outlet pipe 12, respectively. Liquid enters through inlet pipe 11, then flows through the channel formed by the first upper guide plate 131 and the side wall of the upper cavity 16 into the first channel 1311. The liquid then flows through the first channel 1311 into the channel formed by the first upper guide plate 131 and the second upper guide plate 132 into the second channel 1322. The liquid then flows through the second channel 1322 into the channel formed by the second upper guide plate 132 and the third upper guide plate 133 into the third channel 1333. Finally, the liquid flows out through outlet pipe 12, meandering between the first end 161 and the second end 162 of the upper cavity 16.

[0046] The upper turbulent flow section and the lower turbulent flow section are arranged in a mirror image. The upper turbulent flow section includes several straight turbulent flow plates and several curved turbulent flow plates. The straight turbulent flow plates are located on both sides of the upper meandering flow channel 13 and are staggered in the direction of liquid flow. The curved turbulent flow plates are located 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 turbulent flow plates are used to change the flow direction of the liquid. Specifically, the straight turbulent flow plates include a first straight turbulent flow plate 141, a second straight turbulent flow plate 142, and a third straight turbulent flow plate 144. The first straight turbulent flow plate 141 is located on one side of the first upper guide plate 131 and is opposite to the inlet pipe 11. It is used to block the liquid entering the upper meandering flow channel 13 for the first time, causing the liquid to change its flow direction at the first straight turbulent flow plate 141, generating turbulence, achieving sufficient heat exchange, improving the internal temperature uniformity of the liquid, and improving the heat exchange efficiency. The second straight turbulence plate 142 is disposed on the side of the upper cavity 16 opposite to the first upper guide plate 131. The second straight turbulence plate 142 and the first straight turbulence plate 141 are staggered in the direction of liquid flow and their ends intersect each other to form a tortuous flow channel. The third straight turbulence plate 144 is vertically disposed at the second end 162 of the upper cavity 16 and is disposed opposite to the first upper guide plate 131. The bend turbulence plate is L-shaped and includes a first bend turbulence plate 143, a second bend turbulence plate 145, and a third bend turbulence plate 146. The first bend turbulence plate 143 is symmetrically disposed at the other end of the first upper guide plate 131, that is, located in the first channel 1311, while the third straight turbulence plate 144 is inserted between the two first bend turbulence plates 143, and the ends of the first bend turbulence plate 143 and the third straight turbulence plate 144 intersect to form a tortuous channel. The second bend turbulence plate 145 is located at the other end of the second upper guide plate 132, that is, within the second channel 1322, and is intersected with the first bend turbulence plate 143 to form a tortuous channel. The third bend turbulence plate 146 is located between the third upper guide plate 133 and the first end 161 of the upper cavity 16, and is opposite to the second bend turbulence plate 145 to form a tortuous channel. The water outlet pipe 12 is opposite to the third bend turbulence plate 146 to form a tortuous water outlet channel. The turbulence section enables the liquid to generate sufficient turbulence in the meandering flow channel, thereby achieving effective heat exchange, improving the uniformity of liquid temperature in the meandering flow channel, and thus improving the temperature uniformity of the heating plate 3, avoiding excessively high local temperatures of the heating plate 3, and improving the heating stability and service life.

[0047] The height of the straight turbulence plate and the bend turbulence plate is the same as the height of the upper guide plate, and they all rest against the heating plate 3.

[0048] The upper turbulent flow section and the upper guide flow section work together to form a more complex tortuous flow channel, which can not only extend the path of the liquid in the meandering flow channel and prolong the heat exchange time, but also improve the turbulence of the liquid and achieve reliable heat exchange.

[0049] As shown in Figure 9, the liquid enters through the inlet pipe 11, and then flows in a tortuous manner through the first straight turbulence plate 141, the second straight turbulence plate 142, the two first bend turbulence plates 143, the third straight turbulence plate 144, the second bend turbulence plate 145, and the third bend turbulence plate 146, and finally flows out through the outlet pipe 12.

[0050] As shown in Figures 10 to 16, in Embodiment 2, the structure of the upper guide section is the same as that of the lower guide section. The upper guide section includes a fourth upper guide plate 134, a fifth upper guide plate 135, and a sixth upper guide plate 136. Two fourth upper guide plates 134 and two fifth upper guide plates 135 are symmetrically arranged. One end of the fourth upper guide plate 134 is located 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 located on one side of the inlet pipe 11 and the outlet pipe 12, respectively. The fifth upper guide plates 135 are symmetrically arranged inside the upper cavity 16, with one end of the fifth upper guide plate 135 located at the second end 162. A fifth channel 1355 is provided between the other end and the first end 161. 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, located on the center line of the upper heating seat 1. One end of the sixth upper guide plate 136 is located at the first end 161, and 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 upper guide plates 134, the fifth upper guide plates 135 and the sixth upper guide plate 136, together with the two sides of the upper cavity 16, form an upper meandering flow channel 13 in the upper cavity 16, with both ends communicating with the inlet pipe 11 and the 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. Liquid enters through inlet pipe 11, then flows through the channel formed by the fourth upper guide plate 134 and the side of upper cavity 16 into fourth channel 1344. Liquid then flows through fourth channel 1344 into the channel formed by the fourth upper guide plate 134 and fifth upper guide plate 135 into fifth channel 1355. Liquid then flows through fifth channel 1355 into the channel formed by the fifth upper guide plate 135 and sixth upper guide plate 136 into sixth channel. Liquid then flows through sixth channel into the channel between sixth upper guide plate 136 and fifth upper guide plate 135 located on one side of outlet pipe 12, flows through the remaining channels in sequence, and finally flows out through outlet pipe 12. The fourth upper guide plate 134, fifth upper guide plate 135 and sixth upper guide plate 136 form a meandering flow channel.

[0051] The upper turbulence section and the lower turbulence section are arranged in a mirror image. The upper turbulence section 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 both sides of the other end of the fourth upper guide plate 1344, within the fourth channel 1344. The two first upper turbulence plates 191 form a V-shape, with their ends abutting against the side wall of the upper cavity 16 and the side of the fifth upper guide plate 135, respectively. The height of the first upper turbulence plate 191 is less than the height of the fifth upper guide plate 135, allowing liquid to pass through. The second upper turbulence plates 192 are located on both sides of the other end of the fifth upper guide plate 135, within the fifth channel 1355. The two second upper turbulence plates 192 form a V-shape, with their ends abutting against the fourth upper guide plate 134 and the sixth upper guide plate 136, respectively. The third upper turbulence plate 193 is disposed on both sides of the other end of the sixth upper guide plate 136. The two third upper turbulence plates 193 form a V-shape, and their ends respectively abut against the fifth upper guide plates 135 on both sides. The height of the turbulence plate is less than the height of the guide plate, allowing liquid to pass through. The turbulence plate can generate turbulence in the liquid, thereby enabling the liquid to exchange heat fully and improving the heat exchange effect.

[0052] Furthermore, the first upper turbulence plate 191 has a first inclined surface 1911 at the end away from the fourth upper guide plate 134; the second upper turbulence plate 192 has a second inclined surface 1921 at the end away from the fifth upper guide plate 135; and the third upper turbulence plate 193 has a third inclined surface 1931 at the end 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 inclined towards 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 overall flow velocity inside the flow channel uniform, making the heat exchange of the heating plate 3 uniform, improving the temperature uniformity of the heating plate 3, and extending the service life of the heating plate 3.

[0053] As shown in Figure 16, a manifold 31 is provided on one side of the end of the heating plate 3, and the manifold 31 is connected to the water outlet pipe 12. When the heating plate 3 only has an electric heating layer 32 on one side, because the surface of the electric heating layer 32 has 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 that 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 output temperature, a manifold 31 is provided at the end of the heating plate 3, that is, a manifold 31 is provided on the heating substrate. The electric heating layer 32 avoids the manifold 31. The manifold 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 mix in the manifold 31 before flowing out, thereby improving the uniformity of the temperature of the liquid exiting the water outlet pipe 12 and improving the accuracy of the output water temperature detection. A temperature sensor is installed in the water outlet pipe 12 to detect the output water temperature, thereby improving the control accuracy of heating.

[0054] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of the invention and should not be construed as limiting the scope of protection of the invention in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of the invention without inventive effort, and these embodiments will all fall within the scope of protection of the claims of the present invention. Embodiments of the present invention

[0055] Type the description paragraph of embodiments of the present invention here. Industrial applicability

[0056] Type the industrial utility description paragraph here. Sequence List Free Content

[0057] Type the free content description paragraph for the sequence list here.

Claims

1. An immersion heater, characterized in that, include: The upper heating seat (1) is provided with an upper cavity (16), an inlet pipe (11) and an outlet pipe (12) communicating with the upper cavity (16), and an upper meandering flow channel (13) provided in the upper cavity (16) such that the two ends of the upper cavity (16) are respectively communicating with the inlet pipe (11) and the outlet pipe (12). The lower heating seat (2) is provided on the upper heating seat (1). The lower heating seat (2) is provided with a lower cavity (26) opposite to the upper cavity (16) and a lower meandering flow channel (23) provided in the lower cavity (26) and forming a lower meandering flow channel (23) with both ends communicating with the water inlet pipe (11) and the water outlet pipe (12) respectively. A heating plate (3) is disposed between the upper cavity (16) and the lower cavity (26). The end of the heating plate (3) abuts against the ends of the inlet pipe (11) and the outlet pipe (12), so that the liquid enters the upper meandering channel (13) and the lower meandering channel (23) from the inlet pipe (11) and then flows out through the outlet pipe (12). The heating plate (3) heats the liquid in the upper meandering channel (13) and the lower meandering channel (23). A control board (4) is disposed in the control slot (18) of the upper heating seat (1) and connected to the control board (4); and The top cover (5) is located on the top of the control slot (18).

2. The immersion heater according to claim 1, characterized in that; The upper meandering flow channel (13) includes several upper guide sections, which are staggered 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 meandering channel (23) includes several lower guide sections, which are staggered at both ends of the lower cavity (26) to allow the liquid to flow back and forth at both ends of the lower cavity (26).

3. The immersion heater according to claim 2, characterized in that; The upper meandering channel (13) is provided with several upper turbulent flow sections for generating turbulence in the liquid; The lower meandering channel (23) is provided with several lower turbulent sections for generating turbulence in the liquid.

4. The immersion heater according to claim 3, characterized in that, The structure of the upper guide section is the same as that of the lower guide section, and the upper guide section includes: The first upper guide plate (131) has one end located at the first end (161) of the upper cavity (16), and the other end of the first upper guide plate (131) has a channel between it and the second end (162) of the upper cavity (16) which is opposite to the first end (161). The first upper guide plate (131) is also located on one side of the water inlet pipe (11). A second upper guide plate (132) is provided at one end of the second end (162), and a channel is left between the other end of the second upper guide plate (132) and the first end (161); and The third upper guide plate (133) is located at one end of the first end (161), and a channel is left 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 water outlet pipe (12). The inlet pipe (11) and the 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) together with the two sides of the upper cavity (16) form an upper meandering flow channel (13) in the upper cavity (16) that is connected to the water inlet pipe (11) and the water outlet pipe (12) respectively.

5. The immersion heater according to claim 4, characterized in that, The structure of the upper turbulent section is the same as that of the lower turbulent section, and the upper turbulent section includes: A plurality of straight turbulence plates are disposed on both sides of the upper meandering flow channel (13) and are staggered in the direction of liquid flow; and A plurality of turbulence-reducing 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 turbulence-reducing plates are used to change the flow direction of the liquid.

6. The immersion heater according to claim 3, characterized in that, The structure of the upper guide section is the same as that of the lower guide section, and the upper guide section includes: Two fourth upper guide plates (134) are provided, one end of which is located at the first end (161) of the upper cavity (16), and the other end of which is provided with a channel between it and the second end (162) of the upper cavity (16) which is opposite to the first end (161). The two fourth upper guide plates (134) are also located on one side of the water inlet pipe (11) and the water outlet pipe (12), respectively. Two fifth upper guide plates (135) are symmetrically arranged within the upper cavity (16). One end of each fifth upper guide plate (135) is located at the second end (162), and a channel is left between the other end of each fifth upper guide plate (135) and the first end (161). The two fifth upper guide plates (135) are also located between the two fourth upper guide plates (134). The sixth upper guide plate (136) has one end located at the first end (161), and the other end of the sixth upper guide plate (136) has a channel between it and the second end (162). The sixth upper guide plate (136) is also located between the two fifth upper guide plates (135). The inlet pipe (11) and the 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) together with the two sides of the upper cavity (16) form an upper meandering flow channel (13) in the upper cavity (16) that is connected to the water inlet pipe (11) and the water outlet pipe (12) at both ends respectively.

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

8. The immersion heater according to claim 7, characterized in that, The first upper turbulence plate (191) has a first inclined surface (1911) at the end away from the fourth upper guide plate (134). The second upper turbulence plate (192) has a second inclined surface (1921) at the end away from the fifth upper guide plate (135); The third upper turbulence plate (193) has a third inclined surface (1931) at the end away from the sixth upper guide plate (136).

9. An immersion heater according to any one of claims 1 to 8, characterized in that, A manifold (31) is provided on one side of the end of the heating plate (3), and the manifold (31) is connected to the water outlet pipe (12).

10. An immersion heater according to claim 1, characterized in that, The upper heating seat (1) is provided with several wiring holes (15), and one end of the heating plate (3) is provided with several wiring terminals (41). The wiring terminals (41) are inserted into the wiring holes (15) and connected to the control board (4).

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