Sealing structure for air pre-heater and air pre-heater

Abstract

The invention relates to the technical field of air pre-heaters, in particular to a sealing structure for an air pre-heater and the air pre-heater, and the sealing structure for the air pre-heater comprises a rubber rotating ring and a rubber sealing seat; the rubber rotating ring comprises a transverse connecting ring and a vertical connecting ring, and the transverse connecting ring is vertically connected with the vertical connecting ring; the rubber sealing seat comprises a bottom plate, a first rubber ring and a second rubber ring, the first rubber ring and the second rubber ring are perpendicularly connected with the bottom plate, the first rubber ring is arranged in the second rubber ring, an inserting groove is formed between the first rubber ring and the second rubber ring, and the vertical connecting ring is inserted into the inserting groove and can rotate in the inserting groove. The vertical connecting ring and the inserting groove form a rotary sealing structure, and lubricating oil is arranged in the inserting groove to lubricate the rotary sealing structure. The surface of the inner wall of the rubber rotating ring and the surface of the inner wall of the inserting groove are lubricated through lubricating oil, abrasion between the rubber rotating ring and the rubber sealing seat can be reduced during rotation, and the service life of the rotating sealing structure is prolonged.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air preheaters, and in particular, to a sealing structure for an air preheater and an air preheater. Background Art

[0002] An air preheater, abbreviated as an AP, is a heat exchanger that uses the waste heat of the exhaust gas from devices such as boilers to preheat the incoming air. Its function is to absorb the waste heat of the exhaust gas from equipment such as boilers to heat the incoming air, reduce the exhaust gas temperature of equipment such as boilers, improve the thermal efficiency of equipment such as boilers, and make the fuel easier to ignite, burn stably, and improve the combustion efficiency.

[0003] Existing air preheaters usually include a rotor and a housing. During the rotation of the rotor, the rotor and the housing are sealed by a rubber ring. However, during the rotation of the rotor, the rubber ring will be subjected to friction, which easily causes wear of the rubber ring and affects the service life of the sealing structure. Summary of the Invention

[0004] In view of the above problems, the present disclosure is proposed. The present disclosure provides a sealing structure for an air preheater and an air preheater.

[0005] According to one aspect of the present disclosure, there is provided a sealing structure for an air preheater, including:

[0006] A rubber rotating ring, the rubber rotating ring includes a horizontal connecting ring and a vertical connecting ring, and the horizontal connecting ring is perpendicularly connected to the vertical connecting ring;

[0007] A rubber sealing seat, the rubber sealing seat includes a bottom plate, a first rubber ring and a second rubber ring. The first rubber ring and the second rubber ring are perpendicularly connected to the bottom plate. The first rubber ring is disposed inside the second rubber ring. A plugging groove is formed between the first rubber ring and the second rubber ring. The vertical connecting ring is inserted into the plugging groove and can rotate in the plugging groove. The vertical connecting ring and the plugging groove form a rotating sealing structure, and lubricating oil is disposed in the plugging groove to lubricate the rotating sealing structure.

[0008] In addition, for the sealing structure for an air preheater according to one aspect of the present disclosure, the inner side of the vertical connecting ring abuts against the first rubber ring, and the outer side of the vertical connecting ring abuts against the second rubber ring.

[0009] In addition, for the sealing structure for an air preheater according to one aspect of the present disclosure, the radial thickness of the first rubber ring is greater than the radial thickness of the vertical connecting ring.

[0010] In addition, for the sealing structure for an air preheater according to one aspect of the present disclosure, the rubber sealing seat further includes:

[0011] The third rubber ring is disposed outside the second rubber ring. An oil storage groove is formed between the third rubber ring and the second rubber ring. Lubricating oil is stored in the oil storage groove, and the oil storage groove communicates with the insertion groove.

[0012] In addition, for the sealing structure of the air preheater according to an aspect of the present disclosure, the second rubber ring is provided with a plurality of oil through grooves. The plurality of oil through grooves are uniformly arranged at the lower part of the second rubber ring. The oil through grooves communicate the oil storage groove and the insertion groove, and the lubricating oil in the oil storage groove enters the insertion groove through the oil through grooves.

[0013] In addition, for the sealing structure of the air preheater according to an aspect of the present disclosure, further comprising:

[0014] A plurality of clamping cylinders are uniformly arranged on the third rubber ring. The piston rod of the clamping cylinder passes through the third rubber ring and extends into the oil storage groove. A rubber pressure roller is provided at the front end of the piston rod, and the rubber pressure roller abuts against the second rubber ring.

[0015] In addition, for the sealing structure of the air preheater according to an aspect of the present disclosure, further comprising:

[0016] An installation frame is provided at the front end of the piston rod. A plurality of the rubber pressure rollers are arranged in the installation frame, and the rubber pressure rollers can rotate in the installation frame.

[0017] In addition, for the sealing structure of the air preheater according to an aspect of the present disclosure, further comprising:

[0018] An oil storage tank for storing lubricating oil;

[0019] An oil pump is connected to the oil storage tank and can transport the lubricating oil in the oil storage tank to the oil storage groove;

[0020] An oil supply pipe, the first end of which is connected to the oil storage groove and the second end is connected to the oil pump.

[0021] In addition, for the sealing structure of the air preheater according to an aspect of the present disclosure, further comprising:

[0022] An overflow pipe, the first end of which is connected to the oil storage groove and the second end is connected to the oil storage tank, for returning the excess lubricating oil in the oil storage groove to the oil storage tank.

[0023] According to another aspect of the present disclosure, there is provided an air preheater, comprising: the sealing structure of the air preheater according to any one of the above technical solutions.

[0024] In addition, for the air preheater according to an aspect of the present disclosure, further comprising:

[0025] A rotor, which is connected to the rubber rotating ring;

[0026] A housing, wherein the rotor is disposed in the housing and can rotate in the housing, and the rubber seal seat is connected to the housing.

[0027] In addition, for the air preheater according to an aspect of the present disclosure, the lateral connecting ring of the rubber rotating ring is connected to the top of the rotor;

[0028] The bottom plate of the rubber seal seat is connected to the housing.

[0029] For the seal structure for the air preheater and the air preheater according to the embodiments of the present disclosure, a rotating seal structure is formed by the rubber rotating ring and the insertion slot, lubricating oil is provided in the insertion slot, and the lubricating oil lubricates the surface of the rubber rotating ring and the inner wall of the insertion slot, and the wear between the rubber rotating ring and the rubber seal seat can be reduced during rotation, and the service life of the rotating seal structure is extended.

[0030] It should be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By describing the embodiments of the present disclosure in more detail in conjunction with the drawings, the above and other objects, features and advantages of the present disclosure will become more apparent. The drawings are used to provide a further understanding of the embodiments of the present disclosure, and constitute a part of the specification, and are used to explain the present disclosure together with the embodiments of the present disclosure, and do not constitute a limitation to the present disclosure. In the drawings, the same reference numerals generally represent the same components or steps.

[0032] Figure 1 FIG. is a perspective view of the air preheater according to the embodiment of the present disclosure, and only the rotor is shown in the figure;

[0033] Figure 2 FIG. is a cross-sectional view of the air preheater according to the embodiment of the present disclosure, and only the rotor is shown in the figure;

[0034] Figure 3 is Figure 2 an enlarged view of part B in

[0035] Figure 4 is Figure 1 an enlarged view of part A in

[0036] Figure 5 FIG. is a perspective view of the clamping cylinder according to the embodiment of the present disclosure.

[0037] Description of the reference numerals:

[0038] 1: Rotor; 2: Rotating shaft; 3: Rubber rotating ring; 31: Horizontal connecting ring; 32: Vertical connecting ring; 4: Rubber sealing seat; 5: First rubber ring; 6: Second rubber ring; 7: Insertion slot; 8: Oil storage tank; 9: Oil passage groove; 10: Clamping cylinder; 11: Mounting bracket; 12: Rubber pressure roller; 13: Oil storage tank; 14: Oil pump; 15: Oil supply pipe; 16: Overflow pipe; 17: Third rubber ring; 18: Bottom plate. Detailed implementation manners

[0039] In order to make the objectives, technical solutions, and advantages of the present disclosure more apparent, exemplary embodiments according to the present disclosure will be described in detail below with reference to the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments of the present disclosure. It should be understood that the present disclosure is not limited by the exemplary embodiments described herein.

[0040] The embodiment of the present disclosure provides a sealing structure for an air preheater. By lubricating the inner surface of the rubber rotating ring and the insertion slot with lubricating oil, the wear between the rubber rotating ring and the rubber sealing seat can be reduced during rotation, and the service life of the rotating sealing structure can be extended.

[0041] The implementation manners of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0042] As Figure 1 , Figure 2 , Figure 3 , Figure 4 shown, the embodiment of the present disclosure provides a sealing structure for an air preheater, including: a rubber rotating ring 3 and a rubber sealing seat 4;

[0043] The rubber rotating ring 3 includes a horizontal connecting ring 31 and a vertical connecting ring 32, and the horizontal connecting ring 31 is perpendicularly connected to the vertical connecting ring 32; both the horizontal connecting ring 31 and the vertical connecting ring 32 are annular structures. The horizontal connecting ring 31 needs to be connected to the top of the rotor 1 of the air preheater, and the horizontal connecting ring 31 supports the vertical connecting ring 32. When the rotor rotates, the horizontal connecting ring 31 and the vertical connecting ring 32 are driven to rotate. The perpendicular connection relationship enables the vertical connecting ring 32 to be inserted into the rubber sealing seat 4 and to rotate in the rubber sealing seat 4;

[0044] The rubber sealing seat 4 includes a bottom plate 18, a first rubber ring 5 and a second rubber ring 6. The first rubber ring 5 and the second rubber ring 6 are perpendicularly connected to the bottom plate 18. The bottom plate 18 needs to be connected to the housing of the air preheater. The bottom plate 18 supports the first rubber ring 5 and the second rubber ring 6. The first rubber ring 5 is arranged inside the second rubber ring 6. An insertion slot 7 is formed between the first rubber ring 5 and the second rubber ring 6. The vertical connection ring 32 is inserted into the insertion slot 7 and can rotate in the insertion slot 7. The vertical connection ring 32 and the insertion slot 7 form a rotational sealing structure, which can seal the connection between the rotor 1 and the housing. Lubricating oil is provided in the insertion slot 7 to lubricate the rotational sealing structure.

[0045] The inner side surface of the vertical connection ring 32 is in contact sealing with the outer side surface of the first rubber ring 5, and the outer side surface of the vertical connection ring 32 is in contact sealing with the inner side surface of the second rubber ring 6. The bottom end of the vertical connection ring 32 may or may not be in contact with the bottom plate 18, which does not affect the sealing effect of the rotational sealing structure. The radial width of the insertion slot 7 needs to be adapted to the radial thickness of the vertical connection ring 32. It can be an equal relationship, or the radial width of the insertion slot 7 is slightly smaller than the radial thickness of the vertical connection ring 32. There should be no large gap between the vertical connection ring 32 and the inner wall of the insertion slot 7 so as to form a sealing structure.

[0046] The lubricating oil in the insertion slot 7 will infiltrate between the vertical connection ring 32 and the first rubber ring 5, the second rubber ring 6, and the bottom plate 18. Due to the lubricating effect of the lubricating oil, the frictional resistance of the vertical connection ring 32 rotating in the insertion slot 7 is small, and the wear of the vertical connection ring 32, the first rubber ring 5, the second rubber ring 6, and even the bottom plate 18 is small. The lubricating oil can also enhance the sealing effect, which is equivalent to improving the sealing effect of the rotational sealing structure.

[0047] The horizontal connection ring 31 and the vertical connection ring 32 can be integrally formed, and the first rubber ring 5, the second rubber ring 6 and the bottom plate 18 can be integrally formed.

[0048] In the sealing structure for the air preheater in the embodiments of the present disclosure, the lubricating oil lubricates the surface of the rubber rotating ring and the inner wall of the insertion slot, and the wear between the rubber rotating ring and the rubber sealing seat can be reduced during rotation, thereby prolonging the service life of the rotational sealing structure.

[0049] In some possible implementation manners, such as Figure 2 、 Figure 3 shown, the inner side of the vertical connection ring 32 abuts against the first rubber ring 5, and the outer side of the vertical connection ring 32 abuts against the second rubber ring 6, forming a relatively tight rotational sealing structure to improve the sealing effect.

[0050] In some possible implementation manners, such as Figure 2 、 Figure 3As shown, the horizontal connecting ring 31 and the vertical connecting ring 32 form a right-angle bending structure, which is relatively simple in structure and can avoid interference with other structures.

[0051] In some possible implementation manners, such as Figure 2 , Figure 3 As shown, the radial thickness of the first rubber ring 5 is greater than the radial thickness of the vertical connecting ring 32. The first rubber ring 5 substantially forms a limiting structure for the rubber rotating ring 3. Therefore, the radial thickness of the first rubber ring 5 is designed to be relatively large. The radial thickness of the first rubber ring 5 is also greater than the radial thickness of the second rubber ring 6. This can prevent the first rubber ring 5 from deforming during use, damaging the rotational sealing structure, and maintaining a long service life of the rotational sealing structure. The radial thickness of the vertical connecting ring 32 and the radial thickness of the second rubber ring 6 can be equal or approximately equal.

[0052] In some possible implementation manners, such as Figure 2 , Figure 3 As shown, the rubber sealing seat 4 further includes: a third rubber ring 17;

[0053] The third rubber ring 17 is disposed outside the second rubber ring 6. The third rubber ring 17 is also perpendicularly connected to the bottom plate 18. A lubricating oil storage groove 8 is formed between the third rubber ring 17 and the second rubber ring 6. Lubricating oil is stored in the lubricating oil storage groove 8, and the lubricating oil storage groove 8 communicates with the insertion groove 7.

[0054] In order to always keep lubricating oil in the insertion groove 7, a lubricating oil storage groove 8 is particularly provided outside the second rubber ring 6. The lubricating oil is first stored in the lubricating oil storage groove 8 and then flows from the lubricating oil storage groove 8 into the insertion groove 7. In this way, there can be continuous lubricating oil to lubricate the vertical connecting ring 32, the first rubber ring 5, the second rubber ring 6, and the bottom plate 18.

[0055] In some possible implementation manners, such as Figure 1 , Figure 4 As shown, the second rubber ring 6 is provided with a plurality of oil through grooves 9;

[0056] The plurality of oil through grooves 9 are uniformly distributed at the lower part of the second rubber ring 6. The oil through grooves 9 communicate the lubricating oil storage groove 8 and the insertion groove 7. The lubricating oil in the lubricating oil storage groove 8 enters the insertion groove 7 through the oil through grooves 9. The plurality of oil through grooves 9 are uniformly distributed, which can ensure that sufficient lubricating oil can enter the entire circumferential insertion groove 7 and avoid lack of lubricating oil in some parts.

[0057] In some possible implementation manners, such as Figure 1 , Figure 2 , Figure 4 As shown, the sealing structure for the air preheater further includes: a plurality of clamping cylinders 10;

[0058] A plurality of clamping cylinders 10 are evenly arranged on the third rubber ring 17. The piston rod of the clamping cylinder 10 passes through the third rubber ring 17 and extends into the oil storage tank 8. The third rubber ring 17 is provided with a through hole corresponding to the piston rod, and the piston rod can move in the through hole. A rubber pressing roller 12 is arranged at the front end of the piston rod, and the rubber pressing roller 12 abuts against the second rubber ring 6.

[0059] By arranging the clamping cylinder 10 to abut against the second rubber ring 6 to pressurize the second rubber ring 6, the fitting tightness between the second rubber ring 6 and the vertical connecting ring 32, and between the vertical connecting ring 32 and the first rubber ring 5 can be improved, and the sealing effect of the rotating sealing structure can be enhanced. The plurality of clamping cylinders 10 are evenly arranged, which can ensure that there is sufficient pressing force on the entire circumference of the second rubber ring 6, avoiding the lack of pressing force in some parts. This pressing force needs to be appropriate and should not be too large to cause the vertical connecting ring 32 to be unable to rotate in the insertion groove 7.

[0060] The axial direction of the rubber pressing roller 12 is vertically arranged, which can fully contact the outer side surface of the second rubber ring 6, and the force application area is relatively large.

[0061] In some possible implementation manners, such as Figure 1 、 Figure 4 、 Figure 5 shown, the sealing structure for the air preheater further includes:

[0062] A mounting frame 11 is arranged at the front end of the piston rod. A plurality of rubber pressing rollers 12 are arranged in the mounting frame 11, and the rubber pressing rollers 12 can rotate in the mounting frame 11.

[0063] By arranging a plurality of rubber pressing rollers 12 in the mounting frame 11, the force application area of the piston rod of the clamping cylinder 10 on the second rubber ring 6 can be enlarged, and a larger contact part between the second rubber ring 6 and the vertical connecting ring 32, and between the vertical connecting ring 32 and the first rubber ring 5 can be in a tightly contacting state, improving the sealing effect of the rotating sealing structure.

[0064] The rubber pressing roller 12 can rotate in the mounting frame 11, which can avoid damaging the second rubber ring 6 when abutting against it. If a non-rotatable structure is adopted, it is easy to cause perforation or tearing of the outer side surface of the second rubber ring 6 when abutting.

[0065] In some possible implementation manners, such as Figure 1 、 Figure 2 shown, the sealing structure for the air preheater further includes: an oil storage tank 1, an oil pump 14 and an oil supply pipe 15;

[0066] The oil storage tank 13 is used for storing lubricating oil, and the oil storage tank 13 can be installed on the housing of the air preheater;

[0067] The oil pump 14 is connected to the oil storage tank 13 and can transport the lubricating oil in the oil storage tank 13 to the oil storage groove 8, specifically through the oil supply pipe 15;

[0068] One end of the oil supply pipe 15 is connected to the oil storage groove 8, and the other end is connected to the oil pump 14. When the lubricating oil in the oil storage groove 8 is lacking, starting the oil pump 14 can transport the lubricating oil to the oil storage groove 8 to replenish the lubricating oil for the rotating seal structure in time.

[0069] In some possible implementation manners, such as Figure 1 、 Figure 2 as shown, it further includes: an overflow pipe 16;

[0070] One end of the overflow pipe 16 is connected to the oil storage groove 8, and the other end is connected to the oil storage tank 13, and is used to return the excessive lubricating oil in the oil storage groove 8 to the oil storage tank 13.

[0071] In the oil storage groove 8, the height of the oil outlet of the overflow pipe 16 is lower than that of the oil outlet of the oil supply pipe 15. When the height of the lubricating oil in the oil storage groove 8 exceeds the overflow pipe 16, the excess lubricating liquid can overflow into the oil storage tank 13 through the overflow pipe 16 to reduce the loss of lubricating oil.

[0072] If the height of the oil outlet of the overflow pipe 16 is higher than that of the oil outlet of the oil supply pipe 15, the lubricating oil may flow back to the oil storage tank 13 through the oil supply pipe 15 when not supplying oil, which is not conducive to controlling the height of the lubricating oil in the oil storage groove 8.

[0073] Such as Figure 1 、 Figure 2 as shown, the embodiment of the present disclosure further provides an air preheater, including: the sealing structure for the air preheater described in any one of the above embodiments.

[0074] In some possible implementation manners, such as Figure 1 、 Figure 2 as shown, the air preheater further includes: a rotor 1 and a housing. The housing is not shown in the figure and can refer to the prior art;

[0075] The rotor 1 is connected to the rubber rotating ring 3, and when the rotor 1 rotates, it drives the rubber rotating ring 3 to rotate; a rotating shaft 2 is arranged on the rotor 1, and the rotating shaft 2 is welded to the centers of the upper surface and the lower surface of the rotor 1 respectively, and the rotating shaft 2 is used to support the rotation of the rotor 1;

[0076] The rotor 1 is arranged in the housing and can rotate in the housing. The rubber seal seat 4 is connected to the housing, and during operation, the rubber seal seat 4 and the housing remain fixed. In addition, the oil storage tank 13, the oil supply pipe 15, and the overflow pipe 16 are all fixed to the housing.

[0077] In some possible implementation manners, such as Figure 1 、 Figure 2As shown, the lateral connecting ring 31 of the rubber rotating ring 3 is connected to the top of the rotor 1. An installation groove can be provided at the top of the rotor 1 to install and fix the lateral connecting ring 31.

[0078] The bottom plate 18 of the rubber sealing seat 4 is connected to the housing. The housing can be provided with an installation groove to install and fix the bottom plate 18.

[0079] As described above, with reference to the accompanying drawings, the sealing structure for an air preheater and the air preheater according to the embodiments of the present disclosure have the following advantages:

[0080] A rotating sealing structure is formed by the rubber rotating ring and the insertion slot. Lubricating oil is provided in the insertion slot, and the lubricating oil lubricates the surface of the rubber rotating ring and the inner wall of the insertion slot, which can reduce the wear between the rubber rotating ring and the rubber sealing seat during rotation and extend the service life of the rotating sealing structure.

[0081] By pressurizing the rotating sealing structure with a clamping cylinder, the fitting tightness of the rubber rotating ring and the rubber sealing seat can be improved, thereby further enhancing the sealing effect at the connection between the rotor and the housing.

[0082] The basic principles of the present disclosure have been described above in combination with specific embodiments. However, it should be noted that the advantages, advantages, effects, etc. mentioned in the present disclosure are only examples and not limitations. It cannot be considered that these advantages, advantages, effects, etc. are essential for each embodiment of the present disclosure. In addition, the above-mentioned specific details are only for the purpose of illustration and easy understanding, rather than limitations. The above details do not limit the present disclosure to necessarily adopt the above specific details to implement.

[0083] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present disclosure are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open-ended words, meaning "including but not limited to", and can be used interchangeably with each other. The word "or" and "and" used herein refer to the word "and / or", and can be used interchangeably with each other unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with each other.

[0084] In addition, as used herein, in the enumeration of items starting with "at least one", the "or" indicates a separate enumeration. For example, the enumeration of "at least one of A, B, or C" means A or B or C, or AB or AC or BC, or ABC (i.e., A and B and C). In addition, the term "exemplary" does not mean that the described examples are preferred or better than other examples.

[0085] It should also be noted that in the system of the present disclosure, each component or each step can be decomposed and / or recombined. These decompositions and / or recombinations should be regarded as equivalent solutions of the present disclosure.

[0086] Various changes, substitutions, and alterations to the technologies described herein can be made without departing from the teachings defined by the appended claims. Additionally, the scope of the claims of the present disclosure is not limited to the specific aspects of the processes, machines, manufactures, compositions of events, means, methods, and acts described above. Current or later-developed processes, machines, manufactures, compositions of events, means, methods, or acts that perform substantially the same function or achieve substantially the same result as the corresponding aspects described herein can be utilized. Accordingly, the appended claims include such processes, machines, manufactures, compositions of events, means, methods, or acts within their scope.

[0087] The foregoing description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the present disclosure. Thus, the present disclosure is not intended to be limited to the aspects shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0088] The foregoing description has been presented for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present disclosure to the form disclosed herein. Although several example aspects and embodiments have been discussed above, those skilled in the art will recognize some of their variations, modifications, alterations, additions, and subcombinations.

Claims

1. A sealing structure for an air preheater, characterized in that include: A rubber rotating ring (3), the rubber rotating ring (3) comprising a transverse connecting ring (31) and a vertical connecting ring (32), the transverse connecting ring (31) being vertically connected to the vertical connecting ring (32); A rubber sealing seat (4), the rubber sealing seat (4) comprising a bottom plate (18), a first rubber ring (5) and a second rubber ring (6), the first rubber ring (5) and the second rubber ring (6) being vertically connected to the bottom plate (18), the first rubber ring (5) being arranged inside the second rubber ring (6), a plug-in groove (7) being formed between the first rubber ring (5) and the second rubber ring (6), the vertical connecting ring (32) being inserted into the plug-in groove (7) and being rotatable in the plug-in groove (7), the vertical connecting ring (32) and the plug-in groove (7) forming a rotating sealing structure, and lubricating oil being arranged in the plug-in groove (7) to lubricate the rotating sealing structure.

2. The sealing structure for an air preheater according to claim 1, characterized in that, The inner side of the vertical connection ring (32) abuts against the first rubber ring (5), and the outer side of the vertical connection ring (32) abuts against the second rubber ring (6).

3. The sealing structure for an air preheater according to claim 1, characterized in that, The radial thickness of the first rubber ring (5) is greater than the radial thickness of the vertical connecting ring (32).

4. The sealing structure for an air preheater according to claim 1, wherein The rubber sealing seat (4) also includes: A third rubber ring (17), the third rubber ring (17) is arranged outside the second rubber ring (6), an oil storage tank (8) is formed between the third rubber ring (17) and the second rubber ring (6), lubricating oil is stored in the oil storage tank (8), and the oil storage tank (8) is connected to the plug-in slot (7).

5. The sealing structure for an air preheater according to claim 4, characterized in that, The second rubber ring (6) is provided with a plurality of oil passage grooves (9), and the plurality of oil passage grooves (9) are evenly distributed at the lower part of the second rubber ring (6). The oil passage grooves (9) are connected to the oil storage groove (8) and the plug-in groove (7), and the lubricating oil in the oil storage groove (8) enters the plug-in groove (7) from the oil passage grooves (9).

6. The sealing structure for an air preheater according to claim 4, characterized in that, Also includes: A plurality of clamping cylinders (10) are evenly distributed on the third rubber ring (17); a piston rod of the clamping cylinder (10) passes through the third rubber ring (17) and extends into the oil storage tank (8); a rubber pressure roller (12) is provided at the front end of the piston rod, and the rubber pressure roller (12) presses against the second rubber ring (6).

7. The sealing structure for an air preheater according to claim 6, characterized in that, Also includes: A mounting frame (11), wherein the mounting frame (11) is arranged at the front end of the piston rod, and a plurality of rubber pressure rollers (12) are arranged in the mounting frame (11), and the rubber pressure rollers (12) can rotate in the mounting frame (11).

8. The sealing structure for an air preheater according to claim 4, characterized in that, Also includes: An oil storage tank (13), wherein the oil storage tank (13) is used to store lubricating oil; an oil pump (14), the oil pump (14) being connected to the oil storage tank (13) and capable of transporting lubricating oil in the oil storage tank (13) to the oil storage tank (8); An oil supply pipe (15), wherein a first end of the oil supply pipe (15) is connected to the oil storage tank (8), and a second end of the oil supply pipe (15) is connected to the oil pump (14).

9. The sealing structure for an air preheater according to claim 8, characterized in that, Also includes: An overflow pipe (16), the first end of the overflow pipe (16) is connected to the oil storage tank (8), and the second end is connected to the oil storage tank (13), for returning the excess lubricating oil in the oil storage tank (8) to the oil storage tank (13).

10. Air preheater, characterized in that, Comprising: The sealing structure for the air preheater according to any one of claims 1-9.

11. The air preheater according to claim 10, wherein Further comprising: A rotor (1), the rotor (1) is connected to the rubber rotating ring (3); A housing, the rotor (1) is disposed in the housing and can rotate in the housing, and the rubber seal seat (4) is connected to the housing.

12. The air preheater according to claim 11, characterized in that, The transverse connecting ring (31) of the rubber rotating ring (3) is connected to the top of the rotor (1); The bottom plate (18) of the rubber seal seat (4) is connected to the housing.

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