A multi-level heat exchange integrated electric heater

Abstract

This invention relates to the field of heater technology, and in particular to a multi-level heat exchange integrated electric heater, comprising a heating chamber with a first heating chamber, a second heating chamber, and a third heating chamber horizontally spaced along its inner side. A first electric heating unit is disposed in the first heating chamber, a second electric heating unit in the second heating chamber, and a third electric heating unit in the third heating chamber. A temperature measuring chamber is disposed on the inner side of the heating chamber, on the side of the third heating chamber away from the second heating chamber, and a temperature sensor is disposed within the temperature measuring chamber. The first, second, and third electric heating units open or close based on the temperature value detected by the temperature sensor. An inlet pipe and an outlet pipe are disposed on the heating chamber; the inlet pipe connects to the first heating chamber, and the outlet pipe connects to the temperature measuring chamber. A control valve is disposed on the outlet pipe. The outlet water temperature can be maintained within a set temperature range, adapting to both peak and off-peak water usage periods.

Description

Technical Field

[0001] This invention relates to the field of heater technology, and in particular to a multi-level heat exchange integrated electric heater. Background Technology

[0002] An electric heater is a device used to heat fluids. Existing electric heaters include a heater housing with a heating wire inside the housing. By heating the heating wire, the fluid flowing through the housing is heated.

[0003] In some locations, a stable temperature of domestic hot water is required. Current technology typically uses electric heaters to heat the water flow. The water is heated as it passes through the heater. While this method achieves the goal of heating the water, it suffers from drawbacks. The electric heater cannot adjust the heating intensity during peak and off-peak water usage periods. During peak periods, high water consumption leads to relatively low water temperatures, while during off-peak periods, although the water temperature is higher, the lower water consumption results in higher electricity consumption for the heater. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a multi-level heat exchange integrated electric heater, which can maintain the outlet water temperature within a set temperature range and is more adaptable to peak and off-peak water usage periods, thus ensuring relatively stable outlet water temperature and saving more energy.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this application provides a multi-level heat exchange integrated electric heater, including a heating chamber. A first heating chamber, a second heating chamber, and a third heating chamber are horizontally spaced along the inner side of the heating chamber. A first electric heating unit is disposed in the first heating chamber, a second electric heating unit is disposed in the second heating chamber, and a third electric heating unit is disposed in the third heating chamber. A temperature measuring chamber is disposed on the inner side of the heating chamber, on the side of the third heating chamber away from the second heating chamber. A temperature sensor is disposed in the temperature measuring chamber. The first, second, and third electric heating units are turned on or off based on the temperature value detected by the temperature sensor. An inlet pipe and an outlet pipe are disposed on the heating chamber. The inlet pipe connects to the first heating chamber, and the outlet pipe connects to the temperature measuring chamber. A control valve is disposed on the outlet pipe.

[0008] Preferably, a filter chamber is formed between the first heating chamber and the second heating chamber, and a first connection port is formed between the first heating chamber and the filter chamber, the first connection port being located at the bottom of the first heating chamber and the filter chamber; a filter layer is disposed inside the filter chamber; a second connection port is disposed between the filter chamber and the second heating chamber and located at the top, a third connection port is disposed between the second heating chamber and the third heating chamber and located at the top; and a fourth connection port is disposed between the third heating chamber and the temperature measuring chamber and located in the middle.

[0009] Preferably, the first, second, and third electric heating units have the same structure, each including a first heating element and a second heating element; protective components and cleaning components are provided on the outside of the first and second heating elements to protect them; the bottom of the first, second, and third heating chambers is funnel-shaped, and a slag discharge pipe is formed at the bottom of the funnel shape, and a cap is provided on the slag discharge pipe.

[0010] Preferably, the protective assembly includes a support flange fixed in the first heating chamber, the second heating chamber, or the third heating chamber, with two connecting holes spaced apart on the support flange, through which the first heating tube and the second heating tube pass; a protective tube is fixedly installed on the lower side of the support flange through the connecting holes, with two sets of protective tubes spaced apart and respectively sleeved on the outside of the first heating tube and the second heating tube.

[0011] Preferably, the two sets of protective tubes are provided with guide grooves on their adjacent sides. The guide grooves are vertically arranged, and the cleaning component passes through the guide grooves to clean the dirt inside the protective tubes.

[0012] Preferably, the cleaning assembly includes a drive shaft, one end of which passes through the upper end of the heating chamber, and the other end located outside the heating chamber is connected to a drive motor, which drives the drive shaft to rotate. An external thread is tapped on the shaft segment of the drive shaft located within the first, second, or third heating chamber, forming a threaded rod segment. An installation sleeve is threaded onto the threaded rod segment, and a support rod is fixed circumferentially on the outer side of the installation sleeve. The end of the support rod away from the installation sleeve passes through the guide groove and is connected to a scraper ring. The outer wall of the scraper ring abuts against the protective tube. The first or second heating element passes through the center of the scraper ring, and the inner diameter of the scraper ring is larger than the outer diameter of the first or second heating element.

[0013] Preferably, a support ring is fixed on the drive shaft, the support ring is located between the upper sides of the support flange, and the support ring abuts against the support flange.

[0014] Preferably, a shielding assembly for shielding the guide groove is provided on the outer side of the protective tube; the shielding assembly includes a limiting ring fixed to the side wall of the protective tube, the limiting ring being located at the end of the protective tube away from the supporting flange; a first shielding ring, a second shielding ring, and a third shielding ring are sleeved on the outer side of the protective tube; the first shielding ring is sleeved on the outer side of the limiting ring, and a first inner abutment ring is provided on the inner side of the first shielding ring and at the end away from the supporting flange, the first inner abutment ring being located on the side of the limiting ring away from the supporting flange; a first outer abutment ring is provided on the outer side of the first shielding ring and at the end away from the first inner abutment ring; the inner diameter of the first inner abutment ring is smaller than the outer diameter of the limiting ring; the second shielding ring is sleeved on the outer side of the first shielding ring, and a second inner abutment ring is provided on the inner side of the second shielding ring, and a second outer abutment ring is provided on the outer side of the second shielding ring. The first outer abutment ring comprises: an inner abutment ring and a third inner abutment ring. The second inner abutment ring is located at the end of the second shielding ring away from the supporting flange and at the side of the first outer abutment ring away from the supporting flange. The inner diameter of the second inner abutment ring is smaller than the outer diameter of the first outer abutment ring. The second outer abutment ring is located at the end of the second shielding ring close to the supporting flange. The third shielding ring is sleeved on the outside of the second shielding ring. The third inner abutment ring is provided on the inner side of the third shielding ring. The third inner abutment ring is located at the end of the third shielding ring away from the supporting flange and at the side of the second outer abutment ring away from the supporting flange. The inner diameter of the third inner abutment ring is smaller than the outer diameter of the second outer abutment ring. The end of the third shielding ring away from the third inner abutment ring is fixed to the upper side of the support rod. A limiting plate is provided on the outer side of the end of the protective tube away from the supporting flange. The outer diameter of the limiting plate is larger than the outer diameter of the third shielding ring.

[0015] Preferably, the inner side of the scraper ring is provided with an annular mounting groove, and a rubber ring is embedded in the mounting groove. The inner ring of the rubber ring abuts against the first heating element or the second heating element.

[0016] Preferably, a step is formed at one end of the protective pipe near the supporting flange, and a threaded pipe is integrally formed on the upper side of the step. The threaded pipe passes through the connecting hole, and a connecting nut is threaded to the outer side of the pipe section passing through the connecting hole.

[0017] (III) Beneficial Effects

[0018] This invention provides a multi-layered heat exchange integrated electric heater. Through the arrangement of a first heating chamber, a second heating chamber, and a third heating chamber, as water flows sequentially through these three chambers, the first, second, and third electric heating units can heat or stop heating the water based on the temperature values ​​detected by temperature sensors. This ensures that the outlet water temperature is maintained within a set range and is more adaptable to peak and off-peak water usage periods, guaranteeing relatively stable outlet water temperature while saving energy. Simultaneously, protective components and shielding elements can isolate the first and second heating elements, providing an explosion-proof effect and improving the safety of the electric heater. Furthermore, during use, a cleaning component can clean dirt from the inside of the protective components and the outside of the heating elements, preventing any impact on the heating effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a multi-level heat exchange integrated electric heater according to the present invention;

[0020] Figure 2 This is a schematic diagram showing the first electric heating unit protruding in a multi-level heat exchange integrated electric heater of the present invention;

[0021] Figure 3 This is a schematic diagram of a protruding protective component in a multi-layer heat exchange integrated electric heater according to the present invention;

[0022] Figure 4 for Figure 3 Enlarged view of structure A in the middle.

[0023] Marked in the attached diagram:

[0024] 100. Heating chamber; 110. First heating chamber; 111. First connection port; 120. Second heating chamber; 121. Third connection port; 130. Third heating chamber; 131. Fourth connection port; 140. Temperature measuring chamber; 150. Liquid inlet pipe; 160. Liquid outlet pipe; 170. Filter chamber; 171. Filter layer; 172. Second connection port; 180. Slag discharge pipe; 181. Cover; 200a. First electric heating unit; 200b. Second electric heating unit; 200c. Third electric heating unit; 210. First heating element; 220. Second heating element; 300. Protective assembly; 310. Support flange; 311. Connecting hole; 320. Protective Pipe; 321, Step; 322, Threaded pipe; 323, Connecting nut; 324, Guide groove; 400, Cleaning assembly; 410, Drive shaft; 411, Threaded rod segment; 420, Drive motor; 430, Mounting sleeve; 440, Support rod; 450, Scraper ring; 451, Mounting groove; 452, Rubber ring; 460, Support ring; 500, Blocking assembly; 510, Limiting ring; 520, First blocking ring; 521, First inner abutment ring; 522, First outer abutment ring; 530, Second blocking ring; 531, Second inner abutment ring; 532, Second outer abutment ring; 540, Third blocking ring; 541, Third inner abutment ring; 550, Limiting disc. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example

[0027] This invention provides a multi-level heat exchange integrated electric heater, see [link to relevant documentation]. Figures 1-4The device includes a heating chamber 100, and a first heating chamber 110, a second heating chamber 120, and a third heating chamber 130 are formed horizontally at intervals inside the heating chamber 100. A first electric heating unit 200a is provided in the first heating chamber 110, a second electric heating unit 200b is provided in the second heating chamber 120, and a third electric heating unit 200c is provided in the third heating chamber 130. A temperature measuring chamber 140 is located inside the heating chamber 100, on the side of the third heating chamber 130 away from the second heating chamber 120. A temperature sensor is installed in the temperature measuring chamber 140. The first electric heating unit 200a, the second electric heating unit 200b, and the third electric heating unit 200c are turned on or off based on the temperature value detected by the temperature sensor. An inlet pipe 150 and an outlet pipe 160 are provided on the heating chamber 100. The inlet pipe 150 connects to the first heating chamber 110, and the outlet pipe 160 connects to the temperature measuring chamber 140. A control valve is installed on the outlet pipe 160. During operation, water flows into the heating chamber 100 through the inlet pipe 150 and passes sequentially through the first heating chamber 110, the second heating chamber 120, and the third heating chamber 130. During this process, the water is heated by the first electric heating unit 200a, the second electric heating unit 200b, and the third electric heating unit 200c, maintaining the water at a set temperature. Specifically, a controller is provided on the heating chamber 100. The controller receives the signal value of the temperature detected by the temperature sensor and controls the first electric heating unit 200a, the second electric heating unit 200b and the third electric heating unit 200c to work based on the signal value.

[0028] The specific control is as follows: the outlet temperature of the outlet pipe 160 is set to T0. When the temperature sensor detects a temperature value of T1-T0, where T1 is less than T0, the third electric heating unit 200c is controlled to heat the liquid alone. When the temperature sensor detects a temperature value of T2-T1, where T2 is less than T1, the second electric heating unit 200b and the third electric heating unit 200c are controlled to heat simultaneously. When the temperature sensor detects a temperature value less than T2, the first electric heating unit 200a, the second electric heating unit 200b, and the third electric heating unit 200c are heated simultaneously. This setting can handle both peak and off-peak water usage periods, thus saving energy while ensuring a relatively stable outlet water temperature.

[0029] A filter chamber 170 is formed between the first heating chamber 110 and the second heating chamber 120. A first connection port 111 is formed between the first heating chamber 110 and the filter chamber 170, and the first connection port 111 is located at the bottom of the first heating chamber 110 and the filter chamber 170. A filter layer 171 is provided inside the filter chamber 170. The water flowing into the electric heater can be filtered through the filter layer 171.

[0030] A second connection port 172 is provided between the filter chamber 170 and the second heating chamber 120 and located at the top; a third connection port 121 is provided between the second heating chamber 120 and the third heating chamber 130 and located at the top; and a fourth connection port 131 is provided between the third heating chamber 130 and the temperature measuring chamber 140 and located in the middle. The fourth connection port 131 connects the third heating chamber 130 and the temperature measuring chamber 140, allowing the water temperature in the temperature measuring chamber 140 to be maintained within the range T0.

[0031] The first electric heating unit 200a, the second electric heating unit 200b, and the third electric heating unit 200c have the same structure, each including a first electric heating tube 210 and a second electric heating tube 220; when power is supplied to the first electric heating tube 210 and the second electric heating tube 220, the first electric heating tube 210 and the second electric heating tube 220 can generate heat.

[0032] A protective component 300 and a cleaning component 400 are provided on the outside of the first heating element 210 and the second heating element 220 to protect them. The protective component 300 can prevent the first heating element 210 and the second heating element 220 from explosion. The cleaning component 400 can scrape off the scale around the first heating element 210, the second heating element 220 and the protective component 300, thereby improving the heating effect of the first heating element 210 and the second heating element 220.

[0033] The bottom of the first heating chamber 110, the second heating chamber 120 and the third heating chamber 130 are funnel-shaped, and a slag discharge pipe 180 is formed at the bottom of the funnel shape, and a cover 181 is provided on the slag discharge pipe 180.

[0034] The protective assembly 300 includes a support flange 310 fixed in the first heating chamber 110, the second heating chamber 120 or the third heating chamber 130, and two connecting holes 311 are opened at intervals on the support flange 310, through which the first heating tube 210 and the second heating tube 220 pass.

[0035] A protective tube 320 is fixedly installed on the lower side of the supporting flange 310 through the connecting hole 311. Two sets of protective tubes 320 are arranged at intervals and are respectively sleeved on the outside of the first heating element 210 and the second heating element 220. The protective tubes 320 provide an explosion-proof effect for the first heating element 210 and the second heating element 220. At the same time, the protective tubes 320 are made of thermally conductive material.

[0036] Specifically, a step 321 is formed at one end of the protective pipe 320 near the supporting flange 310. A threaded pipe 322 is integrally formed on the upper side of the step 321. The threaded pipe 322 passes through the connecting hole 311, and a connecting nut 323 is threadedly connected to the outside of the pipe section of the threaded pipe 322 passing through the connecting hole 311.

[0037] Two sets of protective tubes 320 are provided with guide grooves 324 on their sides that are close to each other. The guide grooves 324 are vertically arranged. The cleaning component 400 passes through the guide grooves 324 to clean the dirt on the inside of the protective tubes 320.

[0038] It should be noted that, since the protective tube 320 runs through both the top and bottom ends and the guide groove 324 is opened on the side wall, the influence of the protective tube 320 on the heated liquid is negligible during the process of the liquid passing through the heating chamber.

[0039] The cleaning assembly 400 includes a drive shaft 410, one end of which passes through the upper end of the heating chamber 100, and the other end located outside the heating chamber 100 is connected to a drive motor 420, which drives the drive shaft 410 to rotate.

[0040] The drive shaft 410 has an external thread on the shaft segment located in the first heating chamber 110, the second heating chamber 120 or the third heating chamber 130, forming a threaded rod segment 411.

[0041] A mounting sleeve 430 is threaded onto the threaded rod section 411. A support rod 440 is fixed to the outer side of the mounting sleeve 430 along the circumferential direction. The end of the support rod 440 away from the mounting sleeve 430 passes through the guide groove 324 and is connected to a scraper ring 450. The outer wall of the scraper ring 450 abuts against the protective tube 320. The first heating tube 210 or the second heating tube 220 passes through the center of the scraper ring 450. The inner diameter of the scraper ring 450 is larger than the outer diameter of the first heating tube 210 or the second heating tube 220.

[0042] A support ring 460 is fixed on the drive shaft 410. The support ring 460 is located between the upper sides of the support flange 310 and abuts against the support flange 310.

[0043] The inner side of the scraper ring 450 is provided with an annular mounting groove 451, and a rubber ring 452 is embedded in the mounting groove 451. The inner ring of the rubber ring 452 abuts against the first heating tube 210 or the second heating tube 220.

[0044] A shielding component 500 is provided on the outside of the protective tube 320 to shield the guide groove 324. The shielding component 500 can shield the position of the guide groove 324 to prevent fragments from flying out of the wire groove when the first heating tube 210 and the second heating tube 220 explode.

[0045] The shielding assembly 500 includes a limiting ring 510 fixed to the side wall of the protective tube 320, the limiting ring 510 being located at the end of the protective tube 320 away from the supporting flange 310. A first shielding ring 520, a second shielding ring 530, and a third shielding ring 540 are sleeved on the outer side of the protective tube 320.

[0046] The first blocking ring 520 is sleeved on the outside of the limiting ring 510. A first inner abutting ring 521 is provided on the inner side of the first blocking ring 520 and at the end away from the supporting flange 310. The first inner abutting ring 521 is located on the side of the limiting ring 510 away from the supporting flange 310. A first outer abutting ring 522 is provided on the outer side of the first blocking ring 520 and at the end away from the first inner abutting ring 521. The inner diameter of the first inner abutting ring 521 is smaller than the outer diameter of the limiting ring 510.

[0047] The second shielding ring 530 is sleeved on the outside of the first shielding ring 520. The inner side of the second shielding ring 530 is provided with a second inner abutting ring 531, and the outer side of the second shielding ring 530 is provided with a second outer abutting ring 532.

[0048] The second inner abutment ring 531 is located at the end of the second shielding ring 530 away from the support flange 310, and is located on the side of the first outer abutment ring 522 away from the support flange 310. The inner diameter of the second inner abutment ring 531 is smaller than the outer diameter of the first outer abutment ring 522. The second outer abutment ring 532 is located at the end of the second shielding ring 530 close to the support flange 310.

[0049] The third shielding ring 540 is sleeved on the outside of the second shielding ring 530. A third inner abutting ring 541 is provided on the inner side of the third shielding ring 540. The third inner abutting ring 541 is located at the end of the third shielding ring 540 away from the supporting flange 310 and on the side of the second outer abutting ring 532 away from the supporting flange 310. The inner diameter of the third inner abutting ring 541 is smaller than the outer diameter of the second outer abutting ring 532.

[0050] The end of the third shielding ring 540 away from the third inner abutment ring 541 is fixed to the upper side of the support rod 440. A limiting plate 550 is provided on the outer side of the end of the protective tube 320 away from the support flange 310, and the outer diameter of the limiting plate 550 is larger than the outer diameter of the third shielding ring 540.

[0051] This invention provides a multi-layered heat exchange integrated electric heater. With a first heating chamber 110, a second heating chamber 120, and a third heating chamber 130, as water flows through these three chambers sequentially, the first electric heating unit 200a, the second electric heating unit 200b, and the third electric heating unit 200c can heat or stop heating the water based on the temperature values ​​detected by temperature sensors. This ensures that the outlet water temperature is maintained within a set temperature range and is more adaptable to peak and off-peak water usage periods, guaranteeing relatively stable outlet water temperature while saving energy. Simultaneously, the protective component 300 and the shielding component can protect the first heating element 210 and the second heating element 220, providing an explosion-proof effect and improving the safety of the electric heater. Furthermore, during use, the cleaning component 400 can clean dirt from the inside of the protective component 300 and the outside of the heating elements, preventing any impact on the heating effect.

[0052] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0053] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Without conflict, the embodiments and features in the embodiments of this invention can be combined with each other.

[0054] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A multi-level heat exchange integrated electric heater, characterized in that: It includes a heating chamber (100), and a first heating chamber (110), a second heating chamber (120) and a third heating chamber (130) are formed at horizontal intervals on the inner side of the heating chamber (100). The first heating chamber (110) is provided with a first electric heating unit (200a), the second heating chamber (120) is provided with a second electric heating unit (200b), and the third heating chamber (130) is provided with a third electric heating unit (200c). A temperature measuring chamber (140) is provided on the inner side of the heating chamber (100) and on the side of the third heating chamber (130) away from the second heating chamber (120). A temperature sensor is provided in the temperature measuring chamber (140). The first electric heating unit (200a), the second electric heating unit (200b), and the third electric heating unit (200c) are turned on or off based on the temperature value detected by the temperature sensor. The heating chamber (100) is provided with an inlet pipe (150) and an outlet pipe (160). The inlet pipe (150) is connected to the first heating chamber (110), and the outlet pipe (160) is connected to the temperature measuring chamber (140). A control valve is provided on the outlet pipe (160). The first electric heating unit (200a), the second electric heating unit (200b), and the third electric heating unit (200c) have the same structure, each including a first electric heating tube (210) and a second electric heating tube (220). A protective component (300) and a cleaning component (400) are provided on the outside of the first heating element (210) and the second heating element (220) to protect them. The bottom of the first heating chamber (110), the second heating chamber (120) and the third heating chamber (130) are funnel-shaped, and a slag discharge pipe (180) is formed at the bottom of the funnel shape, and a cover (181) is provided on the slag discharge pipe (180). The protective assembly (300) includes a support flange (310) fixed in the first heating chamber (110), the second heating chamber (120) or the third heating chamber (130), and two connecting holes (311) are opened at intervals on the support flange (310), through which the first heating tube (210) and the second heating tube (220) pass. A protective tube (320) is fixedly installed on the lower side of the supporting flange (310) through the connecting hole (311). Two sets of the protective tube (320) are arranged at intervals and are respectively sleeved on the outside of the first heating tube (210) and the second heating tube (220). The two sets of protective tubes (320) are provided with guide grooves (324) on their sides that are close to each other. The guide grooves (324) are vertically arranged. The cleaning component (400) passes through the guide grooves (324) to clean the dirt inside the protective tubes (320). The cleaning assembly (400) includes a drive shaft (410), one end of which passes through the upper end of the heating chamber (100), and the other end located outside the heating chamber (100) is connected to a drive motor (420), which drives the drive shaft (410) to rotate. The drive shaft (410) has an external thread on the shaft segment located in the first heating chamber (110), the second heating chamber (120) or the third heating chamber (130) to form a threaded rod segment (411). A mounting sleeve (430) is threaded onto the threaded rod section (411). A support rod (440) is fixed to the outer side of the mounting sleeve (430) along the circumferential direction. The end of the support rod (440) away from the mounting sleeve (430) passes through the guide groove (324) and is connected to a scraper ring (450). The outer wall of the scraper ring (450) abuts against the protective tube (320). The first heating tube (210) or the second heating tube (220) passes through the center of the scraper ring (450). The inner diameter of the scraper ring (450) is larger than the outer diameter of the first heating tube (210) or the second heating tube (220). A support ring (460) is fixed on the drive shaft (410). The support ring (460) is located between the upper sides of the support flange (310) and abuts against the support flange (310). The outer side of the protective tube (320) is provided with a shielding component (500) to shield the guide groove (324). The shielding assembly (500) includes a limiting ring (510) fixed to the side wall of the protective tube (320), the limiting ring (510) being located at the end of the protective tube (320) away from the supporting flange (310); The outer side of the protective tube (320) is fitted with a first shielding ring (520), a second shielding ring (530) and a third shielding ring (540). The first shielding ring (520) is sleeved on the outside of the limiting ring (510). A first inner abutment ring (521) is provided on the inner side of the first shielding ring (520) and at the end away from the supporting flange (310). The first inner abutment ring (521) is located on the side of the limiting ring (510) away from the supporting flange (310). A first outer abutment ring (522) is provided on the outer side of the first shielding ring (520) and at the end away from the first inner abutment ring (521). The inner diameter of the first inner abutment ring (521) is smaller than the outer diameter of the limiting ring (510). The second shielding ring (530) is sleeved on the outside of the first shielding ring (520). The inner side of the second shielding ring (530) is provided with a second inner abutting ring (531), and the outer side of the second shielding ring (530) is provided with a second outer abutting ring (532). The second inner abutment ring (531) is located at the end of the second shielding ring (530) away from the support flange (310) and on the side of the first outer abutment ring (522) away from the support flange (310). The inner diameter of the second inner abutment ring (531) is smaller than the outer diameter of the first outer abutment ring (522). The second outer abutment ring (532) is located at one end of the second shielding ring (530) near the support flange (310); The third shielding ring (540) is sleeved on the outside of the second shielding ring (530). The third shielding ring (540) has a third inner abutment ring (541) on its inner side. The third inner abutment ring (541) is located at the end of the third shielding ring (540) away from the support flange (310) and at the side of the second outer abutment ring (532) away from the support flange (310). The inner diameter of the third inner abutment ring (541) is smaller than the outer diameter of the second outer abutment ring (532). The end of the third shielding ring (540) away from the third inner abutment ring (541) is fixed to the upper side of the support rod (440); A limiting plate (550) is provided on the outer side of the end of the protective tube (320) away from the supporting flange (310), and the outer diameter of the limiting plate (550) is larger than the outer diameter of the third shielding ring (540).

2. The multi-level heat exchange integrated electric heater according to claim 1, characterized in that: A filter chamber (170) is formed between the first heating chamber (110) and the second heating chamber (120), and a first connection port (111) is formed between the first heating chamber (110) and the filter chamber (170). The first connection port (111) is located at the bottom of the first heating chamber (110) and the filter chamber (170); a filter layer (171) is provided inside the filter chamber (170). A second connection port (172) is provided between the filter chamber (170) and the second heating chamber (120) and located at the top; a third connection port (121) is provided between the second heating chamber (120) and the third heating chamber (130) and located at the top. A fourth connection port (131) is provided between the third heating chamber (130) and the temperature measuring chamber (140) and located in the middle.

3. The multi-level heat exchange integrated electric heater according to claim 1, characterized in that: The inner side of the scraper ring (450) is provided with an annular mounting groove (451), and a rubber ring (452) is embedded in the mounting groove (451). The inner ring of the rubber ring (452) abuts against the first heating tube (210) or the second heating tube (220).

4. The multi-level heat exchange integrated electric heater according to claim 1, characterized in that: The protective tube (320) has a step (321) formed at one end near the supporting flange (310). A threaded tube (322) is integrally formed on the upper side of the step (321). The threaded tube (322) passes through the connecting hole (311), and a connecting nut (323) is threaded to the outside of the tube section of the threaded tube (322) that passes through the connecting hole (311).

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