An axial sealing device for air preheater

Abstract

The present invention discloses an axial sealing device for an air preheater, which relates to the technical field of air preheater sealing. The device comprises an installation unit, including a transverse frame and a side frame, wherein the side frames are symmetrically fixed on both sides of the transverse frame; a main sealing unit, including a radial seal and an axial seal, wherein the radial seal is symmetrically installed at the top and bottom of the transverse frame, and the axial seal is installed in the middle of the side frames on both sides; and an auxiliary sealing unit, including a movable frame and an auxiliary seal, wherein the movable frame is movably installed on the side frame, and the auxiliary seal is installed in the movable frame. The present invention solves the problem of easy air leakage in the existing air preheater rotor.

Description

Technical Field

[0001] The present invention relates to the technical field of air preheater sealing, and in particular to an air preheater axial sealing device. Background Art

[0002] A rotary air preheater is a heat exchange device primarily used in coal-fired boilers. It improves combustion efficiency and saves energy by preheating the air entering the boiler. Its working principle is to indirectly contact hot flue gas with cold air through a rotating mechanism, transferring the heat in the flue gas to the air, thereby increasing the air temperature. A rotary air preheater typically consists of a rotating body, a sealing device, a drive device, and a supporting structure. During use, the flue gas releases heat through the preheater's rotating body, and the air absorbs this heat and, after heating up, enters the boiler to assist combustion. The advantages of a rotary air preheater include a compact structure, high heat exchange efficiency, low heat loss, and the ability to effectively lower the flue gas temperature and reduce air pollution.

[0003] The rotors in existing air preheaters are prone to air leakage during use. The main causes of air leakage include design defects in the sealing structure, aging of the sealing material, excessive gaps between the rotor and the seal, equipment wear, and uneven thermal expansion. Design defects in the sealing structure prevent some sealing structures from effectively adapting to high-temperature, high-pressure working conditions, resulting in insufficient sealing performance. Long-term high-temperature, high-pressure environments cause the sealing material to age, harden, or lose its elasticity, leading to air leakage. If the gap between the rotor and the seal is too large, it is easy for air and flue gas to leak through the gap. Long-term operation causes wear of the rotor and seal, increasing the risk of air leakage. Temperature changes cause uneven thermal expansion of the rotor and seal, affecting the sealing effect. Summary of the Invention

[0004] In view of the problem that the conventional air preheater rotor is prone to air leakage, the present invention is proposed.

[0005] Therefore, the object of the present invention is to provide an axial sealing device for an air preheater, which aims to synchronously change the angle of the sealing plate according to the deformation size of the rotor to improve the sealing effect.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: an air preheater axial sealing device, which includes an installation unit, including a transverse frame and a side frame, and the side frames are symmetrically fixed on both sides of the transverse frame; a main sealing unit, including radial seals and axial seals, the radial seals are symmetrically installed at the top and bottom of the transverse frame, and the axial seals are installed in the middle of the side frames on both sides; and an auxiliary sealing unit, including a movable frame and an auxiliary sealing member, the movable frame is movably installed on the side frame, and the auxiliary sealing member is installed in the movable frame.

[0007] As a preferred solution of the air preheater axial sealing device of the present invention, the transverse frame includes symmetrically arranged crossbeams and vertical beams vertically fixed at both ends thereof, and a shaft seal cover is fixed in the middle of the crossbeam; a first embedding groove and a second embedding groove are respectively opened on opposite sides of the crossbeam and the vertical beam, and the radial seal and the axial seal are respectively installed in the first embedding groove and the second embedding groove, and the outer wall of the shaft seal cover and the bottom end of the crossbeam are symmetrically connected with a limiting folding plate; a first cylinder and a second cylinder are fixed on the side of the crossbeam away from the first embedding groove, the second cylinder is located in the middle of the crossbeam, and the first cylinder is located on one side of the second cylinder.

[0008] As a preferred solution of the air preheater axial sealing device of the present invention, the radial seal includes a transverse sealing frame and an embedded cross frame, and the transverse sealing frame can be placed in the first embedding groove; the transverse sealing frame includes symmetrically arranged transverse sealing strips and a synchronous plate connected between the tops of the transverse sealing strips, and the embedded cross frame can be placed between the transverse sealing strips. A through hole is opened in the middle of the synchronous plate, and the output shaft of the second cylinder is fixedly connected to the end face of the synchronous plate.

[0009] As a preferred solution of the air preheater axial sealing device of the present invention, wherein: a connecting top block is fixedly connected to the top of one end of the embedded cross frame, a plug-in strip hole is opened in the middle of the top of the connecting top block, and the longer side walls of the plug-in strip hole are symmetrically provided with sliding grooves; the first cylinder fixed on the top cross beam is close to the side frame, and the first cylinder fixed on the bottom cross beam is close to the shaft seal cover, and the end of the embedded cross frame away from the connecting top block is hinged to the inner wall of the cross seal.

[0010] As a preferred solution of the air preheater axial sealing device of the present invention, wherein: the output end of the first cylinder is connected to a push column, a sliding column groove is provided in the push column, a sliding column is slidably inserted in the sliding column groove, a first spring is connected to the outer shell of the sliding column, and the two ends of the first spring are respectively connected to the inner wall of the sliding column groove and the top of the sliding column; a plug-in circular plate is also fixed to the bottom end of the top of the sliding column, and hinge columns are fixed on the planes on both sides of the plug-in circular plate, and the plug-in circular plate and the hinge column are slidably inserted into the plug-in strip hole and the sliding groove respectively.

[0011] As a preferred solution of the air preheater axial sealing device of the present invention, the axial sealing member can be placed in the second embedded groove, which includes a displacement sealing plate and a pushing member arranged on both sides thereof; the displacement sealing plate is symmetrically provided with stable sliding grooves near the side walls on both sides of the auxiliary sealing unit, and an inclined guide block is also fixed between the stable sliding grooves, and the pushing member includes a sliding column and an inclined push plate and abutment plate connected at both ends thereof, the sliding column is slidably inserted into the side wall of the vertical beam, and the first inclined surface provided on the inclined push plate is in sliding contact with the second inclined surface provided on the inclined guide block; the inner wall of the second embedded groove is symmetrically connected with an insert slider, and the insert slider is slidably inserted into the stable sliding groove.

[0012] As a preferred solution of the air preheater axial sealing device of the present invention, the side frame includes a symmetrically arranged guide beam and a connecting beam connected at both ends thereof, the top end surface of the side frame is fixed with a first mounting arc plate and a second mounting arc plate in sequence, and the second mounting arc plate is fixed with at least one set of drive motors, whose output shaft is connected with a gear, and the gear is located between the first mounting arc plate and the second mounting arc plate; an arc-shaped slide groove is provided on the first mounting arc plate, and a guide rail is fixed on the inner wall of the guide beam, and anti-slip plates are connected on both sides of the guide rail; a baffle is also fixedly connected between the outer walls of the middle part of the guide beam, and a second spring is fixed between the baffle and the displacement sealing plate.

[0013] As a preferred solution of the air preheater axial sealing device of the present invention, the movable frame includes a central seal and a stable plate, a clamping plate, a stable plug-in plate and a toothed plate symmetrically connected at both ends thereof in sequence, a tooth block is fixed on the outer wall of the toothed plate, and the tooth block is meshed with the gear, and sliding blocks are fixed on the opposite sides of the stable plate and the clamping plate, and the sliding blocks are slidably plugged into both sides of the guide rail.

[0014] As a preferred solution of the air preheater axial sealing device of the present invention, a third embedding groove is provided in the middle of the inner wall of the central sealing member, the auxiliary sealing member is placed in the third embedding groove, primary sealing plates are symmetrically fixed on the vertical inner walls on both sides of the third embedding groove, and the end of the primary sealing plate away from the inner wall of the central sealing member is connected to the bottom plate; a third cylinder is fixed in the middle of the inner wall of the bottom plate, hinged grooves are provided in the middle of the inner walls on both sides opposite to each other, and adjustment grooves are also provided in the middle of the inner walls on both sides opposite to each other of the stabilizing plate.

[0015] As a preferred scheme of the air preheater axial sealing device of the present invention, wherein: the top and bottom of the auxiliary sealing part are fixed with sliding plug-in plates, and the sliding plug-in plates are cooperated and plugged into the adjusting slide groove; the inner wall of the bottom end of the auxiliary sealing part is fixed with an oblique push connecting plate, and the middle part of the auxiliary sealing part away from the oblique push connecting plate is provided with a hinged push hole, and the output shaft of the third cylinder is rotatably hinged with the hinged push hole; the fourth cylinder is symmetrically fixed on the opposite side of the stable plate, and the fourth cylinder is slidably hinged to the two ends of the oblique push connecting plate; the auxiliary sealing part is also provided with an adjusting spring groove on both sides close to the primary sealing plate, and a stabilizing column is vertically fixed in the adjusting spring groove, and a third spring and a stabilizing sleeve are connected to the outer surface of the stabilizing column, and the two ends of the third spring are respectively fixed to the inner wall of the top of the adjusting spring groove and the stabilizing sleeve block, and a deflection column is fixed to the fixed side wall of the stabilizing sleeve block, and the deflection column is slidably plugged into the hinged slide groove.

[0016] Beneficial effects of the present invention:

[0017] By placing the transverse frame horizontally at both ends of the air preheater shell and embedding the side frame in the inner wall of the air preheater, the installation stability is improved. The radial seal and axial seal reduce the gap between the rotor and the shell from the upper and lower ends and side walls of the rotor respectively, thereby improving the sealing effect. The movable frame slides flexibly on the side frame, and the angle between the auxiliary seal and the axial seal can be adjusted according to actual conditions. The smaller the angle, the closer the auxiliary seal and the axial seal, and the better the flow-blocking sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort. Among them:

[0019] Figure 1 This is a schematic diagram of the installation of the air preheater axial sealing device of the present invention.

[0020] Figure 2 It is a schematic diagram of the overall structure of the air preheater axial sealing device of the present invention.

[0021] Figure 3 This is a schematic diagram of the installation unit structure of the air preheater axial sealing device of the present invention.

[0022] Figure 4 This is a schematic diagram of the radial seal structure of the air preheater axial sealing device of the present invention.

[0023] Figure 5 This is a cross-sectional view of the radial seal of the air preheater axial sealing device of the present invention.

[0024] Figure 6 This is a schematic diagram of the axial seal structure of the air preheater axial sealing device of the present invention.

[0025] Figure 7 This is a cross-sectional view of the axial seal of the air preheater axial sealing device of the present invention.

[0026] Figure 8 This is a schematic diagram of the side frame structure of the air preheater axial sealing device of the present invention.

[0027] Figure 9 This is a schematic diagram of the movable frame structure of the air preheater axial sealing device of the present invention.

[0028] Figure 10 This is a schematic diagram of the internal structure of the movable frame of the air preheater axial sealing device of the present invention.

[0029] Figure 11 This is a schematic diagram of the auxiliary sealing structure of the air preheater axial sealing device of the present invention.

[0030] Figure 12 This is a schematic diagram of the sealing action changes of the air preheater axial sealing device of the present invention. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0034] Furthermore, the present invention is described in detail with reference to schematic diagrams. For ease of illustration, when describing the embodiments of the present invention, cross-sectional views illustrating device structures may be partially enlarged and not to scale. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of protection of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0035] Example 1

[0036] Reference Figure 1 、 Figure 2 and Figure 12 , which is the first embodiment of the present invention, provides an air preheater axial sealing device, which includes a mounting unit 100, including a transverse frame 101 and a side frame 102, and the side frames 102 are symmetrically fixed on both sides of the transverse frame 101.

[0037] Among them, the transverse frame 101 is a rectangular frame made of carbon steel or heat-resistant steel, which matches the radial cross-section of the air preheater shell. The side frame 102 is an arc-shaped rectangular frame and is embedded in the inner wall of the air preheater shell. The arc inner wall of the side frame 102 is flush with the inner wall of the air preheater shell.

[0038] The main sealing unit 200 includes radial sealing members 201 and axial sealing members 202 . The radial sealing members 201 are symmetrically mounted on the top and bottom of the transverse frame 101 , and the axial sealing members 202 are mounted in the middle of the side frames 102 on both sides.

[0039] The radial seals 201 are embedded in the upper and lower beams of the transverse frame 101 and can be adjusted and extended by a cylinder to change the distance between the radial seals 201 so as to adjust the distance between them and the upper and lower surfaces of the central rotor.

[0040] Furthermore, axial seals 202 are installed in the middle of the side frames 102 at both ends in the same manner. Their main function is to change the size of the circumferential gap of the rotor, thereby improving the sealing performance.

[0041] The auxiliary sealing unit 300 includes a movable frame 301 and an auxiliary sealing member 302 . The movable frame 301 is movably mounted on the side frame 102 , and the auxiliary sealing member 302 is mounted inside the movable frame 301 .

[0042] Among them, the movable frames 301 are preferably provided with four groups, which are symmetrically installed in pairs on both sides of the side frame 102, and are symmetrical about the transverse frame 101. The two groups of movable frames 301 slidingly installed on the same side frame 102 can rotate synchronously in circles toward and away from each other, and the rotation axis of the movable frame 301 coincides with the rotation axis of the rotor.

[0043] Furthermore, the auxiliary seal 302 can move horizontally within the movable frame 301 and can also deflect counterclockwise. When the rotor is deformed under the action of its own gravity and high temperature conditions, the circumferential edge of the rotor will tilt. At this time, the auxiliary seal 302 can tilt synchronously to achieve fit with the side wall of the rotor, reduce the gap size, and improve the sealing effect.

[0044] Example 2

[0045] Reference Figures 1 to 12 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the transverse frame 101 includes symmetrically arranged crossbeams 101a and vertical beams 101b vertically fixed at both ends thereof, and a shaft seal cover 101c is fixed in the middle of the crossbeam 101a.

[0046] The combined structure of the horizontal beam 101a and the vertical beam 101b is a rectangular frame structure, which has the same radial cross-section as the rotor, but the area is proportionally enlarged to cover the rotor.

[0047] A first embedding groove 101a-1 and a second embedding groove 101b-1 are respectively provided on opposite sides of the horizontal beam 101a and the vertical beam 101b. The radial seal 201 and the axial seal 202 are respectively installed in the first embedding groove 101a-1 and the second embedding groove 101b-1. The outer wall of the shaft seal cover 101c and the bottom end of the horizontal beam 101a are symmetrically connected to the limiting folding plate 101c-1.

[0048] The limiting folding plate 101c - 1 can ensure that the radial seal 201 moves up and down in the first embedding groove 101a - 1 and does not escape from the first embedding groove 101a - 1 , thereby serving as a protective device for the central rotor and preventing it from being hit by the radial seal 201 .

[0049] A first cylinder 101a-2 and a second cylinder 101a-3 are fixed to one side of the beam 101a away from the first embedding groove 101a-1. The second cylinder 101a-3 is located in the middle of the beam 101a, and the first cylinder 101a-2 is located on one side of the second cylinder 101a-3.

[0050] The radial seal 201 includes a transverse sealing frame 201a and an embedded transverse frame 201b. The transverse sealing frame 201a can be fitted and placed in the first embedding groove 101a-1.

[0051] The transverse sealing frame 201a includes symmetrically arranged transverse sealing strips 201a-1 and a synchronization plate 201a-2 connected between the tops of the transverse sealing strips 201a-1. The embedded transverse frame 201b can be placed between the transverse sealing strips 201a-1. A through hole 201a-2a is opened in the middle of the synchronization plate 201a-2. The output shaft 101a-3a of the second cylinder 101a-3 is fixedly connected to the end face of the synchronization plate 201a-2.

[0052] During use, if the rotor is deformed, only the second cylinder 101a-3 needs to be activated to push the transverse sealing frame 201a toward the center to change the size of the gap between it and the upper and lower surfaces of the rotor to avoid air leakage due to a large gap.

[0053] During this process, the embedded horizontal frame 201b is entirely received in the horizontal seal 201a-1, ensuring that the bottom end surface of the horizontal seal 201a-1 is flush with the upper and lower surfaces of the rotor.

[0054] A connecting top block 201b-1 is fixedly connected to the top of one end of the embedded horizontal frame 201b. A plug-in strip hole 201b-1a is opened in the middle of the top of the connecting top block 201b-1. The plug-in strip hole 201b-1a is longer and has sliding grooves 201b-1b symmetrically opened on the side walls on both sides.

[0055] The first cylinder 101a-2 fixed on the top crossbeam 101a is close to the side frame 102, and the first cylinder 101a-2 fixed on the bottom crossbeam 101a is close to the shaft seal cover 101c. The end of the embedded cross frame 201b away from the top block 201b-1 is hinged to the inner wall of the cross seal 201a-1.

[0056] It should be noted that the positions of the first cylinders 101a-2 on the upper and lower sides are different. The purpose is to ensure that the embedded cross frame 201b can deflect synchronously while always remaining parallel, deflecting from the original rectangular structure to a parallelogram structure.

[0057] It should be noted that, in this device, the deflection angle of the embedded horizontal frame 201b is not too large, because the deformation and stretching of the rotor itself will not be too large, and it is only necessary to ensure that it can fit the upper and lower surfaces of the rotor.

[0058] Furthermore, the lower end surface of the embedded cross frame 201b can be an arc-shaped structure, also to ensure that it fits the curved surface of the rotor.

[0059] The output end of the first cylinder 101a-2 is connected to a push column 101a-2a, a sliding column groove 101a-2a1 is opened in the push column 101a-2a, a sliding column 101a-2b is slidably inserted in the sliding column groove 101a-2a1, and a first spring T1 is connected to the outer outer surface of the sliding column 101a-2b, and the two ends of the first spring T1 are respectively connected to the inner wall of the sliding column groove 101a-2a1 and the top of the sliding column 101a-2b.

[0060] The top and bottom ends of the sliding column 101a-2b are also fixed with plug-in circular plates 101a-2c, and the two side planes of the plug-in circular plate 101a-2c are fixed with hinged columns 101a-2c1. The plug-in circular plate 101a-2c and the hinged columns 101a-2c1 are slidably plugged into the plug-in strip hole 201b-1a and the slide groove 201b-1b respectively.

[0061] During use, the push column 101a-2a in the initial state is retracted into the first cylinder 101a-2. At this time, the first spring T1 is in an extended state and ensures that the embedded cross frame 201b is received in the cross sealing strip 201a-1.

[0062] Furthermore, when the embedded cross frame 201b needs to be deflected, the first cylinder 101a-2 is started, and the second cylinder 101a-3 does not need to be started, pushing the column 101a-2a outward, and the bottom end of the sliding column groove 101a-2a1 pushes the sliding column 101a-2b downward, the plug-in circular plate 101a-2c rotates in the plug-in strip hole 201b-1a, and the hinged column 101a-2c1 slides slightly in the sliding groove 201b-1b, preventing the embedded cross frame 201b from being stuck.

[0063] Furthermore, during this process, the push column 101a-2a slides in the through hole 201a-2a, and after reaching the desired deflection angle, the first cylinder 101a-2 is closed and locked.

[0064] It should be noted that if only deflecting the embedded horizontal frame 201b cannot meet the sealing requirements, the second cylinder 101a-3 can also be started synchronously to drive the horizontal sealing frame 201a to move slightly downward, and then the first cylinder 101a-2 can be used to control the deflection of the embedded horizontal frame 201b.

[0065] The axial sealing member 202 can be fitted in the second embedding groove 101 b - 1 and includes a displacement sealing plate 202 a and pushers 202 b provided on both sides thereof.

[0066] The displacement sealing plate 202a is symmetrically provided with stable sliding grooves 202a-1 on both sides of the side walls close to the auxiliary sealing unit 300, and an inclined guide block 202a-2 is fixed between the stable sliding grooves 202a-1. The pushing member 202b includes a sliding column 202b-1 and an inclined push plate 202b-2 and abutment plate 202b-3 connected at both ends thereof. The sliding column 202b-1 is slidably inserted into the side wall of the vertical beam 101b, and the first inclined surface X1 opened on the inclined push plate 202b-2 is in sliding contact with the second inclined surface X2 opened on the inclined guide block 202a-2.

[0067] The inner wall of the second embedding groove 101b-1 is symmetrically connected with an inserting slider 101b-1a, and the inserting slider 101b-1a is slidably inserted into the stable sliding groove 202a-1.

[0068] During use, the movable frame 301 presses the abutting plate 202b-3, thereby driving the oblique pushing plate 202b-2 to push the oblique guide block 202a-2 forward, so that the transfer sealing plate 202a extends from the second embedding groove 101b-1.

[0069] It should be noted that the extension distance of the transfer plate 202a can be achieved by changing the oblique angles of the first inclined surface X1 and the second inclined surface X2. The longer the extension, the smaller the angle. However, no matter how it is extended, it must be ensured that it will not collide with the rotor.

[0070] The remaining structures are the same as those of Example 1.

[0071] Example 3

[0072] Reference Figures 1 to 12 , which is the third embodiment of the present invention. This embodiment differs from the second embodiment in that: the side frame 102 includes symmetrically arranged guide beams 102a and connecting beams 102b connected at both ends thereof, and the top end surface of the side frame 102 is fixed with a first mounting arc plate 102c and a second mounting arc plate 102d in sequence, and the second mounting arc plate 102d is fixed with at least one set of drive motors 102d-1, the output shaft of which is connected to a gear 102d-1a, and the gear 102d-1a is located between the first mounting arc plate 102c and the second mounting arc plate 102d.

[0073] During use, when the driving motor 102d-1 is started, the gear 102d-1a rotates between the first mounting arc plate 102c and the second mounting arc plate 102d.

[0074] An arc-shaped slide groove 102c-1 is provided on the first mounting arc plate 102c, a guide rail 102a-1 is fixed to the inner wall of the guide beam 102a, and anti-slip plates 102a-1a are connected on both sides of the guide rail 102a-1; a baffle 102a-2 is also fixedly connected between the outer walls of the middle part of the guide beam 102a, and a second spring T2 is fixed between the baffle 102a-2 and the displacement sealing plate 202a.

[0075] The movable frame 301 includes a central seal 301a and a stabilizing plate 301b, a clamping plate 301c, a stabilizing insert plate 301d and a gear plate 301e symmetrically connected at both ends thereof. A tooth block 301e-1 is fixed to the outer wall of the gear plate 301e, and the tooth block 301e-1 is meshed with the gear 102d-1a. Sliding blocks 301b-1 are fixed on the opposite sides of the stabilizing plate 301b and the clamping plate 301c, and the sliding blocks 301b-1 are slidably inserted into the two sides of the guide rail 102a-1.

[0076] During use, the sliding block 301b-1 is slidably inserted into the guide rail 102a-1, and the baffle 102a-2 can prevent the movable frame 301 from being separated from the guide rail 102a-1.

[0077] Furthermore, when the driving motor 102d-1 is started, its forward and reverse rotation can be controlled, and through the meshing connection between the gear 102d-1a and the gear block 301e-1, the movable frame 301 can be driven to rotate on the guide rail 102a-1.

[0078] A third embedding groove 301a-1 is opened in the middle of the inner wall of the central sealing member 301a, and the auxiliary sealing member 302 is placed in the third embedding groove 301a-1. The primary sealing plates 301a-2 are symmetrically fixed on the inner walls on both sides of the vertical direction of the third embedding groove 301a-1, and the end of the primary sealing plate 301a-2 away from the inner wall of the central sealing member 301a is connected to the bottom plate 301a-2a.

[0079] During use, if the rotor is not deformed, the primary sealing plate 301a-2 can achieve a sealing effect to a certain extent.

[0080] A third cylinder 301a-2b is fixed in the middle of the inner wall of the bottom plate 301a-2a, a hinged slide 301a-2c is opened in the middle of the inner walls on both sides of the initial sealing plate 301a-2, and an adjustment slide 301b-2 is also opened in the middle of the inner walls on both sides of the stabilizing plate 301b.

[0081] Sliding connecting plates 302a are fixed to the top and bottom of the auxiliary sealing member 302, and the sliding connecting plates 302a are plugged into the adjustment sliding grooves 301b-2.

[0082] It should be noted that the adjustment slot 301b-2 is slightly longer than the sliding connecting plate 302a, so that there is a gap between the two side ends of the sliding connecting plate 302a and the inner wall of the adjustment slot 301b-2, which facilitates the auxiliary sealing component 302 to rotate to a certain extent.

[0083] An oblique push connecting plate 302b is fixed to the inner wall of the bottom end of the auxiliary sealing member 302, and a hinge push hole 302c is opened in the middle of the side of the auxiliary sealing member 302 away from the oblique push connecting plate 302b. The output shaft of the third cylinder 301a-2b is rotatably hinged to the hinge push hole 302c.

[0084] A fourth cylinder 301b-3 is symmetrically fixed to the opposite side of the stabilizing plate 301b, and the fourth cylinder 301b-3 is slidingly hinged to both ends of the oblique push connecting plate 302b.

[0085] During use, if the rotor does not deform but the primary sealing plate 301a-2 cannot meet the sealing requirements, the third cylinder 301a-2b is started to push the auxiliary sealing part 302 outward. At this time, the distance between the outer wall of the rotor and the auxiliary sealing part 302 is reduced, and the sealing performance is improved.

[0086] The auxiliary sealing member 302 is further provided with adjustment spring grooves 302d on both sides close to the primary sealing plate 301a-2, and a stabilizing column 302d-1 is vertically fixed in the adjustment spring groove 302d, and a third spring T3 and a stabilizing sleeve 302d-2 are connected to the outer surface of the stabilizing column, and the two ends of the third spring T3 are respectively fixed to the top inner wall of the adjustment spring groove 302d and the stabilizing sleeve 302d-2, and a deflection column 302d-2a is also fixed to the fixed side wall of the stabilizing sleeve 302d-2, and the deflection column 302d-2a is slidably inserted into the hinged slide groove 301a-2c.

[0087] During use, if the rotor is deformed, the third cylinder 301a-2b and the fourth cylinder 301b-3 are started. After the auxiliary seal 302 moves slightly outward, the third cylinder 301a-2b stops and the fourth cylinder 301b-3 continues to push. At this time, the auxiliary seal 302 rotates around the middle deflection column 302d-2a, and its bottom end rotates out of the third embedding groove 301a-1. Furthermore, due to the thrust of the output shaft of the third cylinder 301a-2b, the auxiliary seal 302 tends to move downward.

[0088] Furthermore, the third spring T3 contracts, the stabilizing sleeve 302d-2 moves upward, and the auxiliary seal 302 moves downward slightly and rotates, fitting with the deflected circumferential side wall of the rotor to achieve synchronous deflection, thereby ensuring the sealing between the inner wall of the auxiliary seal 302 and the rotor side wall.

[0089] Furthermore, if you want to maximize the sealing effect of this device, you need to control the movable frames 301 on both sides of the transverse frame 101 to converge toward the middle, reduce the distance between the two and the axial seal 202, thereby reducing the distance between each flow-blocking structure, thereby improving the sealing effect.

[0090] The remaining structures are the same as those of Example 2.

[0091] It should be noted that the above embodiments are only used to illustrate the technical solutions 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 preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An air preheater axial sealing device, characterized by: include, The mounting unit (100) comprises a transverse frame (101) and a side frame (102), wherein the side frames (102) are symmetrically fixed on both sides of the transverse frame (101); A main sealing unit (200) comprises radial sealing elements (201) and axial sealing elements (202), wherein the radial sealing elements (201) are symmetrically mounted on the top and bottom of the transverse frame (101), and the axial sealing elements (202) are mounted in the middle of the side frames (102) on both sides; and The auxiliary sealing unit (300) comprises a movable frame (301) and an auxiliary sealing member (302), wherein the movable frame (301) is movably mounted on the side frame (102), and the auxiliary sealing member (302) is mounted inside the movable frame (301); The transverse frame (101) comprises symmetrically arranged transverse beams (101a) and vertical beams (101b) vertically fixed at both ends thereof, and a shaft seal cover (101c) is fixed in the middle of the transverse beam (101a); A first embedding groove (101a-1) and a second embedding groove (101b-1) are respectively provided on opposite sides of the crossbeam (101a) and the vertical beam (101b); the radial seal (201) and the axial seal (202) are respectively installed in the first embedding groove (101a-1) and the second embedding groove (101b-1); and the outer wall of the shaft seal cover (101c) and the bottom end of the crossbeam (101a) are symmetrically connected to a limiting folding plate (101c-1); A first cylinder (101a-2) and a second cylinder (101a-3) are fixed to a side of the crossbeam (101a) away from the first embedding groove (101a-1); the second cylinder (101a-3) is located in the middle of the crossbeam (101a); and the first cylinder (101a-2) is located on one side of the second cylinder (101a-3); The radial sealing member (201) comprises a transverse sealing frame (201a) and an embedded transverse frame (201b), and the transverse sealing frame (201a) can be fitted and placed in the first embedding groove (101a-1); The transverse sealing frame (201a) comprises symmetrically arranged transverse sealing strips (201a-1) and a synchronization plate (201a-2) connected between the tops of the transverse sealing strips (201a-1); the embedded transverse frame (201b) can be placed between the transverse sealing strips (201a-1); a through hole (201a-2a) is provided in the middle of the synchronization plate (201a-2); and the output shaft (101a-3a) of the second cylinder (101a-3) is fixedly connected to the end face of the synchronization plate (201a-2); A connecting top block (201b-1) is fixedly connected to the top of one end of the embedded horizontal frame (201b), a plug-in strip hole (201b-1a) is provided in the middle of the top of the connecting top block (201b-1), and sliding grooves (201b-1b) are symmetrically provided on the side walls on both sides of the longer side of the plug-in strip hole (201b-1a); The first cylinder (101a-2) fixed on the top crossbeam (101a) is close to the side frame (102), the first cylinder (101a-2) fixed on the bottom crossbeam (101a) is close to the shaft seal cover (101c), and one end of the embedded cross frame (201b) away from the connecting top block (201b-1) is hinged to the inner wall of the cross seal strip (201a-1).

2. The air preheater axial sealing device according to claim 1, characterized in that: The output end of the first cylinder (101a-2) is connected to a push column (101a-2a), a slide column groove (101a-2a1) is provided in the push column (101a-2a), a push column (101a-2b) is slidably inserted in the slide column groove (101a-2a1), a first spring (T1) is connected to the outer surface of the push column (101a-2b), and two ends of the first spring (T1) are respectively connected to the inner wall of the slide column groove (101a-2a1) and the top end of the push column (101a-2b); A plug-in circular plate (101a-2c) is fixed to the top and bottom ends of the sliding column (101a-2b); hinged columns (101a-2c1) are fixed to the planes on both sides of the plug-in circular plate (101a-2c); the plug-in circular plate (101a-2c) and the hinged columns (101a-2c1) are slidably plugged into the plug-in strip hole (201b-1a) and the sliding groove (201b-1b), respectively.

3. The air preheater axial sealing device according to claim 2, characterized in that: The axial sealing member (202) can be fitted and placed in the second embedding groove (101b-1), and comprises a displacement sealing plate (202a) and pushing members (202b) arranged on both sides thereof; The displacement sealing plate (202a) is symmetrically provided with stable sliding grooves (202a-1) on the side walls on both sides close to the auxiliary sealing unit (300); an oblique guide block (202a-2) is also fixed between the stable sliding grooves (202a-1); the pushing member (202b) comprises a sliding plug column (202b-1) and an oblique push plate (202b-2) and an abutment plate (202b-3) connected at both ends thereof; the sliding plug column (202b-1) is slidably plugged into the side wall of the vertical beam (101b); a first oblique surface (X1) provided on the oblique push plate (202b-2) is in sliding contact with a second oblique surface (X2) provided on the oblique guide block (202a-2); The inner wall of the second embedding groove (101b-1) is symmetrically connected to an inserting slider (101b-1a), and the inserting slider (101b-1a) is slidably inserted into the stable sliding groove (202a-1).

4. The air preheater axial sealing device according to claim 3, characterized in that: The side frame (102) comprises symmetrically arranged guide beams (102a) and connecting beams (102b) connected at both ends thereof; a first mounting arc plate (102c) and a second mounting arc plate (102d) are fixed in sequence to the top end surface of the side frame (102); at least one set of drive motors (102d-1) are fixed to the second mounting arc plate (102d); a gear (102d-1a) is connected to the output shaft of the second mounting arc plate; the gear (102d-1a) is located between the first mounting arc plate (102c) and the second mounting arc plate (102d); An arc-shaped slide groove (102c-1) is provided on the first installation arc plate (102c), a guide slide rail (102a-1) is fixed to the inner wall of the guide beam (102a), and anti-slip plates (102a-1a) are connected to both sides of the guide slide rail (102a-1); A baffle (102a-2) is also fixedly connected between the middle outer walls of the guide beam (102a), and a second spring (T2) is fixed between the baffle (102a-2) and the displacement sealing plate (202a).

5. The air preheater axial sealing device according to claim 4, characterized in that: The movable frame (301) comprises a central sealing member (301a) and a stabilizing plate (301b), a clamping plate (301c), a stabilizing inserting plate (301d) and a toothed plate (301e) symmetrically connected to both ends thereof in sequence. A tooth block (301e-1) is fixed to the outer wall of the toothed plate (301e). The tooth block (301e-1) is meshedly connected to the gear (102d-1a). Sliding inserting blocks (301b-1) are fixed to opposite sides of the stabilizing plate (301b) and the clamping plate (301c). The sliding inserting blocks (301b-1) are slidably inserted into both sides of the guide rail (102a-1).

6. The air preheater axial sealing device according to claim 5, characterized in that: A third embedding groove (301a-1) is provided in the middle of the inner wall of the central sealing member (301a), the auxiliary sealing member (302) is cooperatively placed in the third embedding groove (301a-1), primary sealing plates (301a-2) are symmetrically fixed to the inner walls on both vertical sides of the third embedding groove (301a-1), and one end of the primary sealing plate (301a-2) away from the inner wall of the central sealing member (301a) is connected to a bottom plate (301a-2a); A third cylinder (301a-2b) is fixed in the middle of the inner wall of the bottom plate (301a-2a), hinged sliding grooves (301a-2c) are provided in the middle of the inner walls on both sides opposite to each other of the initial sealing plate (301a-2), and adjustment sliding grooves (301b-2) are also provided in the middle of the inner walls on both sides opposite to each other of the stabilizing plate (301b).

7. The air preheater axial sealing device according to claim 6, characterized in that: Sliding connecting plates (302a) are fixed to the top and bottom of the auxiliary sealing member (302), and the sliding connecting plates (302a) are plugged into the adjusting sliding grooves (301b-2); An oblique push connecting plate (302b) is fixed to the inner wall of the bottom end of the auxiliary sealing member (302), a hinged push hole (302c) is provided in the middle of a side of the auxiliary sealing member (302) away from the oblique push connecting plate (302b), and the output shaft of the third cylinder (301a-2b) is rotatably hinged to the hinged push hole (302c); A fourth cylinder (301b-3) is symmetrically fixed on the opposite side of the stabilizing plate (301b), and the fourth cylinder (301b-3) is slidably hinged to both ends of the oblique push connecting plate (302b); The auxiliary sealing member (302) is further provided with an adjustment spring groove (302d) on both sides close to the primary sealing plate (301a-2); a stabilizing column (302d-1) is vertically fixed in the adjustment spring groove (302d); a third spring (T3) and a stabilizing sleeve (302d-2) are externally connected to the stabilizing column; two ends of the third spring (T3) are respectively fixed to the top inner wall of the adjustment spring groove (302d) and the stabilizing sleeve (302d-2); a deflection column (302d-2a) is further fixed to the fixed side wall of the stabilizing sleeve (302d-2); the deflection column (302d-2a) is slidably inserted into the hinged slot (301a-2c).

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