Rotary air preheater with rotor unbalance monitoring function

Abstract

The invention discloses a rotary air preheater with a rotor unbalance monitoring function, and relates to the technical field of heat exchangers, the rotary air preheater comprises a fixing mechanism, a rotating mechanism, a sealing mechanism and a balancing mechanism, the fixing mechanism comprises a shell, a separation cavity is arranged in the shell, the separation cavity is divided into a smoke area and an air area, the rotating mechanism comprises a rotor, and the sealing mechanism is arranged in the shell. The sealing mechanism comprises a negative pressure assembly and an isolation assembly, the negative pressure assembly is arranged in the shell, the isolation assembly is arranged on the rotor, the negative pressure assembly is used for forming a negative pressure source at the tail end of the smoke area, the isolation assembly is used for isolating the smoke area and the air area, and the balance mechanism is used for conducting fixed-point cleaning on the rotor. According to the invention, in the transition area before the rotor enters the air area, stable negative pressure generated by gas passing through the receiving pipe is utilized, and when the rotor grid rotates to the moment, residual flue gas in the rotor grid is actively sucked out and is guided back to the flue through the independent pipeline, so that the flue gas is prevented from being mixed with air, the air leakage rate of the transition area is reduced, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of heat exchanger technology, specifically a rotary air preheater with rotor imbalance monitoring function. Background Technology

[0002] As a key heat exchange device for large thermal power generating units, the operating efficiency of rotary air preheaters is directly related to the overall energy consumption level of the power plant.

[0003] However, in actual operation, rotary air preheaters have long faced the following technical challenges. Currently, mainstream rotary air preheaters employ non-contact radial gap sealing technology, which involves installing rigid sealing plates on the outer edges of the rotor's radial diaphragms. While this design avoids the risk of thermal deformation and jamming, it creates a direct leakage channel between flue gas and air. In actual operation, due to manufacturing errors, thermal deformation, and wear, this gap often widens further, severely reducing heat exchange efficiency. Ash caking increases rotor rotation resistance; uneven ash distribution can lead to rotor dynamic imbalance, resulting in vibration, jamming, or even seizure. Furthermore, during the process of the rotor compartments absorbing heat in the flue gas zone and rotating to the air zone, some unexhausted flue gas always remains inside. Summary of the Invention

[0004] The purpose of this invention is to provide a rotary air preheater with rotor imbalance monitoring function to solve the problems mentioned in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A rotary air preheater with rotor imbalance monitoring function, the rotary air preheater includes a fixing mechanism, a rotating mechanism, a sealing mechanism and a balancing mechanism;

[0007] The fixing mechanism includes an outer shell, inside which is a separation chamber, which is divided into a flue gas zone and an air zone;

[0008] The rotating mechanism includes a rotor;

[0009] The sealing mechanism includes a negative pressure assembly and an isolation assembly;

[0010] The outer casing is equipped with a negative pressure component, and the rotor is equipped with an isolation component. The negative pressure component is used to form a negative pressure source at the end of the flue gas zone, the isolation component is used to isolate the flue gas zone and the air zone, and the balancing mechanism is used to perform fixed-point cleaning of the rotor.

[0011] The fixed mechanism supports the entire device, and the rotating mechanism is located inside the fixed mechanism. During the rotation of the rotating mechanism, the heat transferred by the flue gas is carried to the air area, thereby heating the air. The rotating mechanism is equipped with a sealing mechanism, and the fixed mechanism is also equipped with a sealing mechanism. The sealing mechanism is used to isolate the flue gas area and the air area, and can directly suck out the flue gas when it is about to reach the transition zone, preventing the flue gas from entering the air and causing pollution. When there is ash accumulation on the rotor, causing the rotor to become unbalanced, the balancing mechanism can clean the ash accumulation area of ​​the rotor.

[0012] Furthermore, the negative pressure component includes an air intake pipe, a receiving pipe, and a baffle. The baffle is fan-shaped and has through holes.

[0013] The receiving tube includes a contraction section, a smoothing section, and an expansion section. The radius of the contraction section gradually decreases to the same size as the radius of the smoothing section, and the radius of the smoothing section gradually increases to the size of the radius of the expansion section.

[0014] The lower end of the suction pipe is inserted into the smooth section, and the upper end of the suction pipe is equipped with a baffle. The suction pipe is connected to the end of the flue gas zone through a through hole.

[0015] A baffle is installed above the suction pipe and is positioned below the flue gas zone, at the point where it is about to enter the air zone. The gas first passes through the contraction section and reaches the smooth section. As the radius of the contraction section gradually decreases, the gas velocity increases, causing the internal pressure of the smooth section to decrease. Thus, the suction pipe draws the flue gas that is about to enter the air zone into the smooth section. Then, the gas carries the drawn-in flue gas along the expansion section into the exhaust pipe and is discharged together, thus preventing the flue gas from entering the air and causing pollution.

[0016] Furthermore, the isolation assembly also includes a sliding plate, a connecting rod, and disc springs. One end of the connecting rod is hinged to the sliding plate, and the other end of the connecting rod is inserted into several sets of disc springs. The several sets of disc springs are located in the rotating mechanism, and the sliding plate is made of synthetic graphite.

[0017] When the rotating mechanism rotates, it drives the sealing mechanism to rotate as well. The sealing mechanism passes under the fixed mechanism. Because the slide plate is made of synthetic graphite, it has heat resistance and self-lubrication properties. The wear caused by friction on the slide plate is relatively minor, which extends its service life to a certain extent. Several sets of disc springs have a certain preload, which is transmitted to the slide plate through the connecting rod. When the slide plate passes the fixed mechanism, the preload of the disc springs causes the upper end of the slide plate to abut against the fixed mechanism, thus maintaining a seal. Even after a period of wear, there may be a gap between the upper end of the slide plate and the fixed mechanism. However, the preload released by the disc springs will cause the slide plate to rotate upward, making up for the original gap and greatly reducing the air leakage rate in the transition area, thus improving the heat exchange efficiency.

[0018] Furthermore, the negative pressure assembly also includes an air inlet pipe and an air outlet pipe, which are located at both ends of the receiving pipe and are connected to the receiving pipe pipe respectively.

[0019] Gas is introduced into the intake pipe, passes through the receiving pipe and the exhaust pipe, and is then discharged from the exhaust pipe. When the gas passes through the receiving pipe, a low pressure is formed inside the receiving pipe. Since the receiving pipe and the suction pipe are connected and the suction pipe is inserted into the receiving pipe, the flue gas that is about to enter the air zone is directly drawn into the receiving pipe from the suction pipe and discharged from the exhaust pipe along with the gas in the original pipe, thereby preventing the flue gas from entering the air and causing pollution.

[0020] Furthermore, the fixing mechanism includes a housing, a sector plate, and an isolation plate. The sector plate and the isolation plate are provided inside the housing. The sector plate and the isolation plate are rotatably connected to the rotating mechanism. The rotating mechanism is located between the sector plate and the isolation plate. A receiving tube is provided on one side of the isolation plate.

[0021] The outer casing protects the internal sector plate, isolation plate, and gas mechanism. Since the rotating mechanism is located between the sector plate and the isolation plate, the sector plate and the isolation plate can divide the entire device into a flue gas zone and an air zone. The flue gas passes through the flue gas zone and leaves heat on the components inside the rotor. The rotation of the rotor drives the heated components to the air zone and exchanges heat into the air. A suction pipe is connected above the receiving pipe on one side of the isolation plate. The suction pipe sucks away the flue gas above, thereby preventing the flue gas from entering the air zone.

[0022] Furthermore, the rotating mechanism also includes a rotating shaft, a rotor is sleeved on the rotating shaft, the rotating shaft is rotatably connected to the sector plate and the isolation plate respectively, and the rotor is rotatably connected to the slide plate.

[0023] When the rotating shaft rotates, the rotor is sleeved on the outer ring of the rotating shaft, and the rotor rotates with the rotating shaft, thereby carrying the heat from the flue gas zone to the air zone, realizing the heat exchange between the flue gas and the air.

[0024] Furthermore, the rotor includes a rotating chamber and partitions. The rotating chamber is fitted around the outer ring of the rotating shaft. Several sets of partitions are provided inside the rotating chamber. Several sets of disc springs are provided inside the several sets of partitions. The several sets of partitions and the sliding plate are rotatably connected.

[0025] Since the rotating chamber is fitted around the outer ring of the rotating shaft, the rotating shaft drives the rotating chamber to rotate. Several sets of partitions are connected inside the rotating chamber. The sliding plate above the partitions isolates the areas on both sides of each partition. When the sliding plate passes through the fan-shaped plate, it plays a more effective sealing role for the flue gas area and the air area, reducing the air leakage rate in the transition area and improving the heat exchange efficiency.

[0026] Furthermore, a drive mechanism is provided inside the housing, which includes a motor and a belt. The motor is located on one side of the isolation plate, and the motor output end abuts against the belt. The belt abuts against the rotating shaft.

[0027] The drive mechanism is located inside the housing, and the motor is located on one side of the isolation plate. The output torque drives the belt to rotate. The belt and the rotating shaft abut against each other, and the belt drives the rotating shaft to rotate, thereby driving the rotor to rotate and realizing heat exchange.

[0028] Furthermore, the housing and the balancing mechanism are rotatably connected. The balancing mechanism includes a cleaning assembly, a vibration sensor, and a speed sensor. The cleaning assembly and the housing are rotatably connected. The vibration sensor and the speed sensor are both located inside the isolation plate. The vibration sensor is placed on the side of the rotating shaft and abuts against the speed sensor and the rotating shaft.

[0029] Because the vibration sensor is placed on the side of the rotating shaft, the vibration generated by the rotating shaft can be directly transmitted to the vibration sensor when the shaft rotates. The vibration sensor monitors whether the amplitude exceeds the limit. When the amplitude exceeds the limit, it records the phase angle corresponding to the point of maximum vibration. The speed sensor then detects the corresponding sector with severe dust accumulation. The cleaning component is then rotated to the area that needs cleaning to remove the dust, thereby controlling the vibration value within a safe range. This effectively avoids a chain reaction of failures such as bearing wear and seal damage caused by increased vibration, and extends the service life of the equipment.

[0030] Compared with the prior art, the beneficial effects of the present invention are: 1. In the transition zone before the rotor enters the air zone, the present invention utilizes the stable negative pressure generated by the high-pressure gas through the receiving pipe to actively suck out the residual flue gas inside the rotor compartment when it rotates to this point, and guides it back to the flue through an independent pipe, thereby preventing the flue gas from entering the air and causing pollution.

[0031] 2. The present invention uses a sliding plate made of synthetic graphite, which allows the sliding plate to be pressed and fixed to the fan-shaped plate with uniform pressure. This structure allows the rotor to deform thermally while reducing the radial sealing gap to almost zero, reducing the air leakage rate in the transition area and improving the heat exchange efficiency.

[0032] 3. Through the coordinated monitoring of vibration sensors and speed sensors, the system can identify the rotor imbalance caused by uneven dust accumulation in real time and accurately locate the key dust accumulation area. Then, high-pressure fixed-point purging of the corresponding sector area is started to eliminate mass eccentricity in the early stage of imbalance, control the vibration value within a safe range, effectively avoid the chain failures such as bearing wear and seal damage caused by aggravated vibration, and extend the service life of the equipment. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2This is a structural schematic diagram from another perspective of the present invention;

[0035] Figure 3 This is a schematic diagram of the negative pressure component of the present invention;

[0036] Figure 4 This is a schematic diagram of the internal structure of the negative pressure component of the present invention;

[0037] Figure 5 This is a schematic diagram of the structure of the isolation component of the present invention;

[0038] Figure 6 This is a schematic diagram of the rotating mechanism of the present invention;

[0039] Figure 7 This is a schematic diagram of the balancing mechanism of the present invention;

[0040] Figure 8 for Figure 7 A magnified view of part A of the view.

[0041] In the diagram: 1. Fixing mechanism; 11. Outer shell; 12. Sector plate; 13. Isolation plate; 2. Rotating mechanism; 21. Rotating shaft; 22. Rotor; 221. Rotating chamber; 222. Partition plate; 3. Sealing mechanism; 31. Suction pipe; 32. Air inlet pipe; 33. Receiving pipe; 331. Contraction section; 332. Smoothing section; 333. Expansion section; 34. Air outlet pipe; 35. Slide plate; 36. Connecting rod; 37. Disc spring; 38. Baffle plate; 4. Drive mechanism; 41. Motor; 42. Belt; 5. Balancing mechanism; 51. Cleaning assembly; 52. Vibration sensor; 53. Speed ​​sensor. Detailed Implementation

[0042] 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.

[0043] Example: Figures 1-8 As shown, the present invention provides a rotary air preheater with rotor imbalance monitoring function.

[0044] like Figures 1-2 As shown, a rotary air preheater with rotor imbalance monitoring function is provided. The rotary air preheater includes a fixing mechanism 1, a rotating mechanism 2, a sealing mechanism 3, and a balancing mechanism 5.

[0045] The fixing mechanism 1 includes a housing 11, and a separation chamber is provided inside the housing 11. The separation chamber is divided into a flue gas zone and an air zone.

[0046] The rotating mechanism 2 includes a rotor 22;

[0047] The sealing mechanism 3 includes a negative pressure component and an isolation component;

[0048] The outer casing 11 is equipped with a negative pressure component, and the rotor 22 is equipped with an isolation component. The negative pressure component is used to form a negative pressure source at the end of the flue gas zone, and the isolation component is used to isolate the flue gas zone and the air zone. The balancing mechanism 5 is used to perform fixed-point cleaning of the rotor 22.

[0049] The fixed mechanism 1 is used to support the entire device. The rotating mechanism 2 is placed inside the fixed mechanism 1. During the rotation of the rotating mechanism 2, the heat transferred by the flue gas is carried to the air area, thereby heating the air. The rotating mechanism 2 is equipped with a sealing mechanism 3, and the fixed mechanism 1 is also equipped with a sealing mechanism 3. The sealing mechanism 3 is used to isolate the flue gas area and the air area, and can directly suck out the flue gas when it is about to reach the transition zone, preventing the flue gas from entering the air and causing pollution. When there is ash accumulation on the rotor 22, causing the rotor 22 to become unbalanced, the ash accumulation area of ​​the rotor can be cleaned by the balancing mechanism 5.

[0050] like Figures 3-4 As shown, the negative pressure assembly includes an air intake pipe 31, a receiving pipe 33, and a baffle 38. The baffle 38 is fan-shaped and has through holes.

[0051] The receiving tube 33 includes a contraction section 331, a smoothing section 332, and an expansion section 333. The radius of the contraction section 331 gradually decreases to be the same as the radius of the smoothing section 332, and the radius of the smoothing section 332 gradually increases to be the same as the radius of the expansion section 333.

[0052] The lower end of the suction pipe 31 is inserted into the smooth section 332, and the upper end of the suction pipe 31 is provided with a baffle 38. The suction pipe 31 is connected to the end of the flue gas zone through a through hole.

[0053] A baffle 38 is provided above the suction pipe 31 and is positioned below the flue gas area, at the point where it is about to enter the air area. The gas first passes through the contraction section 331 and reaches the smooth section 332. As the radius of the contraction section 331 gradually decreases, the gas velocity increases, causing the internal pressure of the smooth section 332 to decrease. Thus, the suction pipe 31 absorbs the flue gas that is about to enter the air area above into the smooth section 332. Then, the gas carries the sucked-in flue gas along the expansion section 333 and discharges it, thereby preventing the flue gas from entering the air and causing pollution.

[0054] like Figure 5 As shown, the isolation assembly also includes a slide plate 35, a connecting rod 36, and disc springs 37. One end of the connecting rod 36 is hinged to the slide plate 35, and the other end of the connecting rod 36 is inserted into several sets of disc springs 37. The several sets of disc springs 37 are located in the rotating mechanism 2. The slide plate 35 is made of synthetic graphite.

[0055] When the rotating mechanism 2 rotates, it drives the sealing mechanism 3 to rotate as well. The sealing mechanism 3 passes under the fixed mechanism 1. Since the material of the slide plate 35 is synthetic graphite, the slide plate 35 has heat resistance and self-lubrication. The wear caused by friction on the slide plate 35 is relatively slight, which extends its service life to a certain extent. In addition, several sets of disc springs 37 have a certain preload. The elastic force of the disc springs 37 is transmitted to the slide plate 35 through the connecting rod 36. When the slide plate 35 passes the fixed mechanism 1, the preload of the disc springs 37 makes the upper end of the slide plate 35 abut against the fixed mechanism 1, thereby maintaining a seal. Even after a period of wear, there may be a gap between the upper end of the slide plate 35 and the fixed mechanism 1. However, the preload released by the disc springs 37 will make the slide plate 35 rotate upward, making up for the original gap, greatly reducing the air leakage rate in the transition area and improving the heat exchange efficiency.

[0056] like Figure 3 As shown, the negative pressure assembly also includes an air inlet pipe 32 and an air outlet pipe 34, which are located at both ends of the receiving pipe 33 and are respectively connected to the receiving pipe 33.

[0057] Gas is introduced into the intake pipe 32, passes through the receiving pipe 33 and the outlet pipe 34, and is then discharged from the outlet pipe 34. When the gas passes through the receiving pipe 33, a low pressure is formed inside the receiving pipe 33. Since the receiving pipe 33 and the suction pipe 31 are connected and the suction pipe 31 is inserted into the receiving pipe 33, the flue gas that is about to enter the air zone is directly drawn into the receiving pipe 33 from the suction pipe 31 and discharged from the outlet pipe 34 along with the gas in the original pipe, thereby preventing the flue gas from entering the air and causing pollution.

[0058] like Figures 1-2 As shown, the fixing mechanism 1 includes a housing 11, a sector plate 12 and an isolation plate 13. The housing 11 is provided with the sector plate 12 and the isolation plate 13. The sector plate 12 and the isolation plate 13 are rotatably connected to the rotating mechanism 2. The rotating mechanism 2 is located between the sector plate 12 and the isolation plate 13. A receiving tube 33 is provided on one side of the isolation plate 13.

[0059] The outer casing 11 serves to protect the internal sector plate 12, isolation plate 13, and gas mechanism. Since the rotating mechanism 2 is located between the sector plate 12 and the isolation plate 13, the sector plate 12 and the isolation plate 13 can divide the entire device into a flue gas zone and an air zone. The flue gas passes through the flue gas zone and leaves heat on the components inside the rotor 22. The rotor 22 rotates and drives the heated components to the air zone, exchanging heat with the air. A suction pipe 31 is connected above the receiving pipe 33 on one side of the isolation plate 13. The suction pipe 31 draws away the flue gas above, thereby preventing the flue gas from entering the air zone.

[0060] like Figure 6As shown, the rotating mechanism 2 also includes a rotating shaft 21, a rotor 22 is sleeved on the rotating shaft 21, the rotating shaft 21 is rotatably connected to the sector plate 12 and the isolation plate 13 respectively, and the rotor 22 is rotatably connected to the slide plate 35.

[0061] When the rotating shaft 21 rotates, the rotor 22 is sleeved on the outer ring of the rotating shaft 21, so the rotor 22 rotates with the rotating shaft 21, thereby carrying the heat of the flue gas zone to the air zone and realizing the heat exchange between the flue gas and the air.

[0062] like Figure 6 As shown, the rotor 22 includes a rotating chamber 221 and a partition plate 222. The rotating chamber 221 is sleeved on the outer ring of the rotating shaft 21. The rotating chamber 221 is provided with a number of partition plates 222. The partition plates 222 are provided with a number of disc springs 37. The partition plates 222 and the slide plate 35 are rotatably connected.

[0063] Since the rotating chamber 221 is fitted around the outer ring of the rotating shaft 21, the rotating shaft 21 drives the rotating chamber 221 to rotate. Several sets of partitions 222 are connected inside the rotating chamber 221. The sliding plate 35 above the partition 222 isolates the areas on both sides of each partition 222. When the sliding plate 35 passes the fan-shaped plate 12, it plays a more effective sealing role for the flue gas area and the air area, reducing the air leakage rate of the transition area and improving the heat exchange efficiency.

[0064] like Figures 1-2 As shown, a drive mechanism 4 is provided inside the housing 11. The drive mechanism 4 includes a motor 41 and a belt 42. The motor 41 is located on one side of the isolation plate 13. The output end of the motor 41 abuts against the belt 42, and the belt 42 abuts against the rotating shaft 21.

[0065] The drive mechanism 4 is placed inside the housing 11, and the motor 41 is placed on one side of the isolation plate 13. The output torque drives the belt 42 to rotate. The belt 42 abuts against the rotating shaft 21, and the belt 42 drives the rotating shaft 21 to rotate, thereby driving the rotor 22 to rotate, so as to achieve heat exchange.

[0066] like Figures 7-8 As shown, the outer casing 11 and the balancing mechanism 5 are rotatably connected. The balancing mechanism 5 includes a cleaning component 51, a vibration sensor 52 and a speed sensor 53. The cleaning component 51 and the outer casing 11 are rotatably connected. The vibration sensor 52 and the speed sensor 53 are both located inside the isolation plate 13. The vibration sensor 52 is located on the side of the rotating shaft 21, and the speed sensor 53 abuts against the rotating shaft 21.

[0067] Since the vibration sensor 52 is located on the side of the rotating shaft 21, the vibration generated by the rotating shaft 21 can be directly transmitted to the vibration sensor 52 when the rotating shaft 21 rotates. The vibration sensor 52 monitors whether the amplitude exceeds the standard. When the amplitude exceeds the standard, it records the phase angle corresponding to the maximum vibration point. The speed sensor 53 then reflects the corresponding sector with severe dust accumulation. The cleaning component 51 is then rotated to the area that needs to be cleaned to remove the dust accumulation, thereby controlling the vibration value within a safe range. This effectively avoids chain failures such as bearing wear and seal damage caused by increased vibration, and extends the service life of the equipment.

[0068] Working principle of the invention:

[0069] During the rotation of rotor 22, the heat transferred from the flue gas is carried to the air area, thereby heating the air. A sealing mechanism 3 is provided on the rotating mechanism 2 to isolate the flue gas area and the air area. The preload of disc spring 37 controls the contact between slide plate 35 and sector plate 12, forming a seal, thereby reducing the air leakage rate in the transition area, improving heat exchange efficiency, and allowing the flue gas to be directly drawn out just before it reaches the transition area. The suction pipe 31 is placed below the flue gas area and at the position where it will soon enter the air area. Gas enters the receiving pipe 33 from the inlet pipe 32 and is heated in the receiving pipe 3. A low pressure is formed inside pipe 3. Since the receiving pipe 33 and the suction pipe 31 are connected, the flue gas that is about to enter the air zone is directly drawn from the suction pipe 31 into the receiving pipe 33, and discharged from the exhaust pipe 34 along with the gas in the original pipe. This prevents the flue gas from entering the air and causing pollution. The drive mechanism 4 is used to drive the rotating mechanism 2 to rotate. The balancing mechanism 5 is used to monitor the dynamic balance of the preheater and clean the ash accumulation area, thereby controlling the vibration value within a safe range. This effectively avoids chain failures such as bearing wear and seal damage caused by increased vibration and extends the service life of the equipment.

[0070] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A rotary air preheater with rotor imbalance monitoring function, characterized in that: The rotary air preheater includes a fixing mechanism (1), a rotating mechanism (2), a sealing mechanism (3), and a balancing mechanism (5). The fixing mechanism (1) includes a housing (11), and the housing (11) is provided with a separation chamber, which is divided into a flue gas zone and an air zone; The rotating mechanism (2) includes a rotor (22); The sealing mechanism (3) includes a negative pressure component and an isolation component; The outer casing (11) is provided with a negative pressure component, and the rotor (22) is provided with an isolation component. The negative pressure component is used to form a negative pressure source at the end of the flue gas zone, and the isolation component is used to isolate the flue gas zone and the air zone. The balancing mechanism (5) is used to perform fixed-point cleaning of the rotor (22).

2. A rotary air preheater with rotor imbalance monitoring function according to claim 1, characterized in that: The negative pressure assembly includes a suction pipe (31), a receiving pipe (33), and a baffle (38). The baffle (38) is fan-shaped and has through holes. The receiving tube (33) includes a contraction section (331), a smoothing section (332), and an expansion section (333). The radius of the contraction section (331) gradually decreases to be the same as the radius of the smoothing section (332), and the radius of the smoothing section (332) gradually increases to be the same as the radius of the expansion section (333). The lower end of the suction pipe (31) is inserted into the smooth section (332), and the upper end of the suction pipe (31) is provided with a baffle (38). The suction pipe (31) is connected to the end of the flue gas area through a through hole.

3. A rotary air preheater with rotor imbalance monitoring function according to claim 2, characterized in that: The isolation assembly includes a slide plate (35), a connecting rod (36) and a disc spring (37). One end of the connecting rod (36) is hinged to the slide plate (35), and the other end of the connecting rod (36) is inserted into several sets of disc springs (37). The several sets of disc springs (37) are located in the rotating mechanism (2). The material of the slide plate (35) is synthetic graphite.

4. A rotary air preheater with rotor imbalance monitoring function according to claim 1, characterized in that: The negative pressure assembly also includes an air inlet pipe (32) and an air outlet pipe (34), which are located at both ends of the receiving pipe (33) and are respectively connected to the receiving pipe (33).

5. A rotary air preheater with rotor imbalance monitoring function according to any one of claims 1 to 4, characterized in that: The fixing mechanism (1) includes a sector plate (12) and an isolation plate (13). The sector plate (12) and the isolation plate (13) are located inside the outer shell (11). The sector plate (12) and the isolation plate (13) are rotatably connected to the rotating mechanism (2). The rotating mechanism (2) is located between the sector plate (12) and the isolation plate (13). A receiving tube (33) is provided on one side of the isolation plate (13).

6. A rotary air preheater with rotor imbalance monitoring function according to claim 5, characterized in that: The rotating mechanism (2) further includes a rotating shaft (21), which is fitted with a rotor (22). The rotating shaft (21) is rotatably connected to the sector plate (12) and the isolation plate (13), respectively. The rotor (22) is rotatably connected to the slide plate (35).

7. A rotary air preheater with rotor imbalance monitoring function according to claim 6, characterized in that: The rotor (22) includes a rotating chamber (221) and a partition (222). The rotating chamber (221) is sleeved on the outer ring of the rotating shaft (21). The rotating chamber (221) is provided with a number of partitions (222). The partitions (222) are provided with a number of disc springs (37). The partitions (222) and the slide plate (35) are rotatably connected.

8. A rotary air preheater with rotor imbalance monitoring function according to claim 7, characterized in that: The housing (11) is provided with a drive mechanism (4), which includes a motor (41) and a belt (42). The motor (41) is located on one side of the isolation plate (13). The output end of the motor (41) abuts against the belt (42), and the belt (42) abuts against the rotating shaft (21).

9. A rotary air preheater with rotor imbalance monitoring function according to claim 8, characterized in that: The outer shell (11) and the balancing mechanism (5) are rotatably connected. The balancing mechanism (5) includes a cleaning component (51), a vibration sensor (52) and a speed sensor (53). The cleaning component (51) and the outer shell (11) are rotatably connected. The vibration sensor (52) and the speed sensor (53) are both located inside the isolation plate (13). The vibration sensor (52) is located on the side of the rotating shaft (21). The speed sensor (53) abuts against the rotating shaft (21).

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