A dynamic fan rotor blade root sealing structure

Abstract

The present invention discloses a blade root sealing structure of a dynamic fan rotor, comprising a blade, a blade root disk, a first sealing ring, a second sealing ring, a third sealing ring, a blade stalk bushing and a blade stalk shaft; the blade, the blade root disk, the blade stalk bushing and the blade stalk shaft are connected in sequence; the first sealing ring, the second sealing ring and the third sealing ring are connected in sequence and sleeved on the connection between the blade and the blade root disk. The present invention reasonably arranges a sealing ring and a blade stalk bushing on the blade root disk between the blade and the blade stalk shaft to improve the wear resistance and sealing of the blade root area, thereby avoiding the problems of stuckness and blade root wear of the rotor blade during use.

Description

Technical Field

[0001] The invention relates to a dynamic variable fan used in a flue gas system of a coal-fired power plant, and in particular to a blade root sealing structure of a rotor blade of the dynamic variable fan. Background Art

[0002] The dynamically adjustable fans used in the flue gas system of coal-fired power plants need to frequently adjust the angle of the rotor blades during use. Over time, the blades are prone to getting stuck, which affects the actual operating performance of the fans. In addition, the blade roots are also prone to wear and tear, which affects the sealing of the blade root area and makes it impossible to prevent flue gas from entering the blade root area and even the internal bearings of the hub, which aggravates the blade sticking and even damages the internal bearings of the fan. Summary of the invention

[0003] In order to solve the problems of rotor blade jamming and blade root wear of a dynamic variable fan, the present invention proposes a blade root sealing structure for a dynamic variable fan rotor. By properly arranging a sealing ring and a blade stalk bushing on the blade root disk between the blade and the blade stalk shaft, the wear resistance and sealing of the blade root area are improved, thereby avoiding the problems of rotor blade jamming and blade root wear during use.

[0004] The technical solution is as follows:

[0005] A blade root sealing structure of a dynamic variable fan rotor comprises a blade, a blade root disk, a first sealing ring, a second sealing ring, a third sealing ring, a blade stalk bushing and a blade stalk shaft;

[0006] The blade, blade root disk, petiole bushing and petiole shaft are connected in sequence; the first sealing ring, the second sealing ring and the third sealing ring are connected in sequence and sleeved on the connection between the blade and the blade root disk.

[0007] As a further improvement of the present invention, the blade includes a blade body consisting of a blade suction surface, a blade pressure surface, a blade leading edge circular arc surface, a blade trailing edge circular arc surface, a blade root section and a blade tip section.

[0008] As a further improvement of the present invention, the blade root plate comprises a cylindrical blade root plate body composed of an upper surface of the blade root plate, a side surface of the blade root plate, a first sealing ring positioning shaft shoulder, a second sealing ring positioning groove, a third sealing ring positioning groove, a lower surface of the blade root plate and a bottom groove of the blade plate, and the blade root plate body connects the blade and the blade stalk shaft; the first sealing ring positioning shaft shoulder, the second sealing ring positioning groove and the third sealing ring positioning groove are arranged on the side surface of the blade root plate; the bottom groove of the blade plate is arranged on the lower surface of the blade root plate;

[0009] The first sealing ring positioning shoulder is connected to the first sealing ring, the second sealing ring positioning groove is connected to the second sealing ring, the third sealing ring positioning groove is connected to the third sealing ring; the bottom groove of the blade disk is connected to the blade stalk bushing.

[0010] As a further improvement of the present invention, the first sealing ring comprises an annular first sealing ring body consisting of a first sealing ring upper surface, a first sealing ring inner side surface, a first sealing ring outer side surface, a first sealing ring chamfered side surface and a first sealing ring lower surface;

[0011] The height of the upper surface of the first sealing ring h 31 Height from the upper surface of the blade root plate h 21 The same, that is, h 31 =h 21 ; The inner diameter of the first sealing ring d 32 The outer diameter of the blade root plate D 22 The same, that is, d 32 =D 22 ; Height h of the lower surface of the first sealing ring 35 Height h from the upper surface of the first sealing ring positioning shoulder 23 The same, that is, h 35 =h 23 .

[0012] As a further improvement of the present invention, the second sealing ring comprises an annular second sealing ring body consisting of a second sealing ring upper surface, a second sealing ring inner side surface, a second sealing ring outer side surface and a second sealing ring lower surface, and is installed in the second sealing ring positioning groove;

[0013] The width l4 of the second sealing ring and the width l of the second sealing ring positioning groove 24 The same, that is, l4 = l 24 ; The inner diameter of the second sealing ring d 42 The inner diameter d of the second sealing ring positioning groove 24 The same, that is, d 42 =d 24 .

[0014] As a further improvement of the present invention, the third sealing ring includes an annular third sealing ring body composed of the second sealing ring upper surface, the second sealing ring inner side surface, the second sealing ring outer side surface and the second sealing ring lower surface, and is installed in the third sealing ring positioning groove.

[0015] The width l5 of the third sealing ring and the width l of the third sealing ring positioning groove 25 The same, that is, l5 = l 25 ; The inner diameter of the second sealing ring d 42 The inner diameter d of the third sealing ring positioning groove 25 The same, that is, d 52 =d 25 .

[0016] As a further improvement of the present invention, the petiole liner includes a petiole liner body consisting of an upper surface of the petiole liner, an inner surface of the petiole liner, an inner shoulder of the petiole liner, a first outer surface of the petiole liner, a second outer surface of the petiole liner, a third outer surface of the petiole liner and a lower surface of the petiole liner, and the petiole liner is arranged between the blade root disk and the hub.

[0017] As a further improvement of the present invention, the petiole shaft lining body is a cylindrical structure with one end being small and the other end being large;

[0018] Height of petiole bushing upper surface h 61 Height h from the top of the bottom groove of the blade disk 27 The same, that is, h 61 =h 27 ; Diameter of inner side of petiole lining d 62 The inner diameter d of the groove at the bottom of the blade disk 27 The same, that is, d 62 =d 27 ; Height of inner shoulder of petiole liner h 63 , height h of the upper surface of the second outer side of the petiole bushing 65 and the lower surface height of the blade root plate h 26 are the same, that is, h 63 =h 65 =h 26 ; Diameter D of the first outer side of the petiole bushing 64 The inner diameter D of the groove at the bottom of the blade disk 27 Same, that is, D 64 =D 27 ; Height of lower surface of petiole bushing h 67 Same height as the lower surface of the wheel hub hole.

[0019] As a further improvement of the present invention, the outer diameter D3 of the first sealing ring, the outer diameter D4 of the second sealing ring, the outer diameter D5 of the third sealing ring and the outer diameter D6 of the third outer side of the petiole bushing are 66 are the same, that is, D3=D4=D5=D 66 ;

[0020] The outer diameter D of the first sealing ring positioning shoulder 23 ≤Outer diameter D3 of the first sealing ring.

[0021] As a further improvement of the present invention, the first sealing ring is made of polytetrafluoroethylene.

[0022] The second sealing ring is made of copper.

[0023] The third sealing ring is made of polytetrafluoroethylene.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] After the dynamic fan rotor blade root sealing structure of the present invention is completed, the problem of the induced draft fan rotor blade being stuck is solved, and the sealing effect of the induced draft fan rotor blade root area is good, and there is no smoke leakage problem. Therefore, the implementation effect of the invention patent is good, which significantly improves the wear resistance and sealing of the fan rotor blade root area, improves the safety of the fan operation, and ensures the safe and stable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the rotor blades of the dynamically adjustable fan of the present invention.

[0027] Figure 2 It is a schematic diagram of the rotor blade structure of the present invention.

[0028] Figure 3 This is a schematic diagram of the blade root plate structure of the present invention.

[0029] Figure 4 It is a schematic diagram of the structure of the first sealing ring of the present invention.

[0030] Figure 5 It is a schematic diagram of the structure of the second sealing ring of the present invention.

[0031] Figure 6 It is a schematic diagram of the third sealing ring structure of the present invention.

[0032] Figure 7 It is a schematic diagram of the petiole bushing structure of the present invention.

[0033] In the figure, 1. blade, 10. blade suction surface, 11. blade pressure surface, 12. blade leading edge arc surface, 13. blade trailing edge arc surface, 14. blade root section, 15. blade tip section.

[0034] 2. Blade root plate, 21. Upper surface of blade root plate, 22. Side of blade root plate, 23. First sealing ring positioning shoulder, 24. Second sealing ring positioning groove, 25. Third sealing ring positioning groove, 26. Lower surface of blade root plate, 27. Bottom groove of blade plate.

[0035] 3. The first sealing ring, 31. The upper surface of the first sealing ring, 32. The inner side surface of the first sealing ring, 33. The outer side surface of the first sealing ring, 34. The chamfered side surface of the first sealing ring, 35. The lower surface of the first sealing ring.

[0036] 4. The second sealing ring, 41. The upper surface of the second sealing ring, 42. The inner side surface of the second sealing ring, 43. The outer side surface of the second sealing ring, 44. The lower surface of the second sealing ring.

[0037] 5. The third sealing ring, 51. The upper surface of the third sealing ring, 52. The inner side surface of the third sealing ring, 53. The outer side surface of the third sealing ring, 54. The lower surface of the third sealing ring.

[0038] 6. Petiole lining, 61. Upper surface of petiole lining, 62. Inner side of petiole lining, 63. Inner shoulder of petiole lining, 64. First outer side of petiole lining, 65. Second outer side of petiole lining, 66. Third outer side of petiole lining, 67. Lower surface of petiole lining. DETAILED DESCRIPTION

[0039] In order to make the purpose and technical solution of the present invention clearer and easier to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] like Figure 1 As shown, the present invention is a blade root sealing structure for a dynamic variable speed fan rotor blade, which divides the dynamic variable speed fan rotor blade into seven parts: a blade 1, a blade root disk 2, a first sealing ring 3, a second sealing ring 4, a third sealing ring 5, a blade stalk bushing 6 and a blade stalk shaft 7. The blade 1, the blade root disk 2, the blade stalk bushing 6 and the blade stalk shaft 7 are connected in sequence; the first sealing ring 3, the second sealing ring 4 and the third sealing ring 5 are connected in sequence and sleeved on the connection between the blade 1 and the blade root disk 2.

[0042] Each part consists of the following:

[0043] 1) Leaf 1, such as Figure 2As shown, the solid body is composed of six surfaces: a blade suction surface 10, a blade pressure surface 11, a blade leading edge arc surface 12, a blade trailing edge arc surface 13, a blade root section 14 and a blade tip section 15.

[0044] 2) Leaf root plate 2, such as Figure 3 As shown, it consists of an upper surface 21 of a blade root disk, a side surface 22 of a blade root disk, a first sealing ring positioning shoulder 23, a second sealing ring positioning groove 24, a third sealing ring positioning groove 25, a lower surface 26 of a blade root disk and a bottom groove 27 of a blade disk, and is used to connect the blade 1 and the blade shank shaft 7, and fix the blade 1 on the hub of the dynamic adjustment fan. The first sealing ring positioning shoulder 23, the second sealing ring positioning groove 24, and the third sealing ring positioning groove 25 are arranged on the side surface 22 of the blade root disk. The first sealing ring positioning shoulder 23 is used for positioning and installing the first sealing ring 3 on the side surface 22 of the blade root disk, the second sealing ring positioning groove 24 is used for positioning and installing the second sealing ring 4 on the side surface 22 of the blade root disk, and the third sealing ring positioning groove 25 is used for positioning and installing the third sealing ring 5 on the side surface 22 of the blade root disk; the bottom groove 27 of the blade disk is arranged on the lower surface 26 of the blade root disk, and is used for positioning and installing the blade shank bushing 6 on the lower surface 26 of the blade root disk.

[0045] 3) The first sealing ring 3, such as Figure 4 As shown, it is composed of a first sealing ring upper surface 31, a first sealing ring inner side surface 32, a first sealing ring outer side surface 33, a first sealing ring chamfered side surface 34 and a first sealing ring lower surface 35, and is located between the blade 1 and the first sealing ring positioning shoulder 23, and is used for the first layer of sealing at the root of the blade. The first sealing ring is made of polytetrafluoroethylene, and the height h of the first sealing ring upper surface 31 is 31 Height h from the upper surface of the blade root plate 21 21 The same, that is, h 31 =h 21 ; The diameter d of the inner side surface 32 of the first sealing ring 32 The outer diameter D of the blade root plate side 22 22 The same, that is, d 32 =D 22 ; The height h of the lower surface of the first sealing ring 35 35 Height h from the upper surface of the first sealing ring positioning shoulder 23 23 The same, that is, h 35 =h 23 .

[0046] 4) The second sealing ring 4, such as Figure 5 As shown, it is composed of a second sealing ring upper surface 41, a second sealing ring inner side surface 42, a second sealing ring outer side surface 43 and a second sealing ring lower surface 44, and is installed in the second sealing ring positioning groove 24 for the second layer of sealing at the root of the blade. The second sealing ring is made of copper. The width l4 of the second sealing ring 4 is the same as the width l of the second sealing ring positioning groove 24. 24The same, that is, l4 = l 24 ; The diameter d of the inner side surface 42 of the second sealing ring 42 The inner diameter d of the second sealing ring positioning groove 24 is 24 The same, that is, d 42 =d 24 .

[0047] 5) The third sealing ring 5, such as Figure 6 As shown, it is composed of a second sealing ring upper surface 51, a second sealing ring inner side surface 52, a second sealing ring outer side surface 53 and a second sealing ring lower surface 51, and is installed in the third sealing ring positioning groove 25, and is used for the third layer of sealing at the root of the blade. The third sealing ring is made of polytetrafluoroethylene, and the width l5 of the third sealing ring 5 is the same as the width l of the third sealing ring positioning groove 25. 25 The same, that is, l5 = l 25 ; The diameter d of the inner side surface 52 of the second sealing ring 42 The inner diameter d of the third sealing ring positioning groove 25 is 25 The same, that is, d 52 =d 25 .

[0048] 6) petiole bushing 6, e.g. Figure 7 As shown, it is composed of a petiole shaft liner upper surface 61, a petiole shaft liner inner side surface 62, a petiole shaft liner inner shoulder 63, a petiole shaft liner first outer side surface 64, a petiole shaft liner second outer side surface 65, a petiole shaft liner third outer side surface 66 and a petiole shaft liner lower surface 67, and is arranged between the blade root disk 2 and the hub to position and protect the blade root disk 2 on the hub. The height h of the petiole shaft liner upper surface 61 is 61 Height h from the top of the bottom groove 27 of the blade disk 27 The same, that is, h 61 =h 27 ; The inner side of the petiole liner 62 diameter d 62 The inner diameter d of the groove 27 at the bottom of the blade disk 27 The same, that is, d 62 =d 27 ; Petiole shaft liner inner shoulder 63 height h 63 , height h of the upper surface of the second outer side surface 65 of the petiole bushing 65 and the lower surface of the blade root plate 26 height h 26 are the same, that is, h 63 =h 65 =h 26 ; The diameter D of the first outer side 64 of the petiole bushing 64 The inner diameter D of the groove 27 at the bottom of the blade disk 27 Same, that is, D 64 =D 27 ; petiole bushing lower surface 67 height h 67 The same height as the lower surface of the wheel hub hole.

[0049] As a preferred embodiment, the outer diameter D3 of the first sealing ring 3, the outer diameter D4 of the second sealing ring 4, the outer diameter D5 of the third sealing ring 5 and the diameter D of the third outer side surface 66 of the petiole bushing are 66 are the same, that is, D3=D4=D5=D 66 .

[0050] As a preferred embodiment, the radial length (outer diameter D 23 Subtract the inner diameter d 23 The difference between the first sealing ring and the first sealing ring is greater than or equal to 5 mm. 23 ≤Outer diameter D3 of the first sealing ring 3.

[0051] As a preferred embodiment, the radial depth (outer diameter D 24 Subtract the inner diameter d 24 difference) ≥ 5mm.

[0052] As a preferred embodiment, the radial depth (outer diameter D 25 Subtract the inner diameter d 25 difference) ≥ 5mm.

[0053] The present invention is described in detail below with reference to the accompanying drawings.

[0054] Example

[0055] The induced draft fan of a domestic 330MW unit is an axial flow fan with adjustable blades. The fan design parameters are: air volume 382.45m 3 / s, total pressure 8500Pa, inlet density 0.6918kg / m 3 The fan has 20 rotor blades and 40 rear guide vane blades. During the operation of the induced draft fan, the rotor blades were stuck, which affected the actual output capacity of the fan.

[0056] In order to solve the problem of stuck induced draft fan rotor blades, a dynamic fan rotor blade root sealing structure is proposed. A first sealing ring positioning shoulder 23, a second sealing ring positioning groove 24, a third sealing ring positioning groove 25 and a blade disk bottom groove 27 are respectively arranged on the blade root disk 2. The first sealing ring 3 is installed close to the first sealing ring positioning shoulder 23, the second sealing ring 4 is installed at the position of the second sealing ring positioning groove 24, the third sealing ring 5 is installed at the position of the third sealing ring positioning groove 25, and the blade shank bushing 6 is installed between the blade disk bottom groove 27 and the fan hub hole. The first sealing ring 3 and the third sealing ring 5 are made of polytetrafluoroethylene, and the second sealing ring 4 is made of metallic copper. The radial length of the first sealing ring positioning shoulder 23 (outer diameter D 23 Subtract the inner diameter d 23 The difference between the outer diameter D and the outer diameter D is 30 mm, and the radial depth of the second sealing ring positioning groove 24 (outer diameter D24 Subtract the inner diameter d 24 The difference between the outer diameter D and the outer diameter D of the third sealing ring positioning groove 25 is 15 mm. 25 Subtract the inner diameter d 25 The difference between the diameter and the diameter of the rotor blade is 15 mm. In this way, the rotor blade root sealing structure is completed.

[0057] Effect of the implementation of the invention: After the dynamic fan rotor blade root sealing structure is completed, the problem of the induced draft fan rotor blade sticking is solved, and the sealing effect of the induced draft fan rotor blade root area is good, and there is no smoke leakage problem. Therefore, the implementation effect of the invention patent is good, which significantly improves the wear resistance and sealing of the fan rotor blade root area, improves the safety of fan operation, and ensures the safe and stable operation of the unit.

[0058] The above embodiments are for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A blade root sealing structure for a dynamic fan rotor blade, characterized in that: It comprises a blade (1), a blade root disk (2), a first sealing ring (3), a second sealing ring (4), a third sealing ring (5), a petiole bushing (6) and a petiole shaft (7); The blade (1), the blade root disk (2), the petiole shaft bushing (6) and the petiole shaft (7) are connected in sequence; the first sealing ring (3), the second sealing ring (4) and the third sealing ring (5) are connected in sequence and sleeved at the connection between the blade (1) and the blade root disk (2); The blade root plate (2) comprises a cylindrical blade root plate body consisting of a blade root plate upper surface (21), a blade root plate side surface (22), a first sealing ring positioning shaft shoulder (23), a second sealing ring positioning groove (24), a third sealing ring positioning groove (25), a blade root plate lower surface (26) and a blade plate bottom groove (27); the blade root plate body connects the blade (1) and the blade petiole shaft (7); the first sealing ring positioning shaft shoulder (23), the second sealing ring positioning groove (24) and the third sealing ring positioning groove (25) are arranged on the blade root plate side surface (22); and the blade plate bottom groove (27) is arranged on the blade root plate lower surface (26); The first sealing ring positioning shoulder (23) is connected to the first sealing ring (3), the second sealing ring positioning groove (24) is connected to the second sealing ring (4), and the third sealing ring positioning groove (25) is connected to the third sealing ring (5); the blade disc bottom groove (27) is connected to the blade stalk bushing (6); The first sealing ring (3) comprises an annular first sealing ring body consisting of a first sealing ring upper surface (31), a first sealing ring inner side surface (32), a first sealing ring outer side surface (33), a first sealing ring chamfered side surface (34) and a first sealing ring lower surface (35); Height of the upper surface (31) of the first sealing ring Height to upper surface (21) of blade root plate The same, that is ; Diameter of the inner side (32) of the first sealing ring Outside diameter of blade root plate side (22) The same, that is ; Height of the lower surface (35) of the first sealing ring Height from the upper surface of the first sealing ring positioning shoulder (23) The same, that is ; The second sealing ring (4) comprises an annular second sealing ring body consisting of a second sealing ring upper surface (41), a second sealing ring inner side surface (42), a second sealing ring outer side surface (43) and a second sealing ring lower surface (44), and is installed in the second sealing ring positioning groove (24); Width of the second sealing ring (4) Width of the second sealing ring positioning groove (24) The same, that is ; Diameter of the inner side (42) of the second sealing ring The inner diameter of the second sealing ring positioning groove (24) The same, that is ; The third sealing ring (5) comprises an annular third sealing ring body consisting of a second sealing ring upper surface (51), a second sealing ring inner side surface (52), a second sealing ring outer side surface (53) and a second sealing ring lower surface (51), and is installed in the third sealing ring positioning groove (25); Width of the third sealing ring (5) Width of the third sealing ring positioning groove (25) The same, that is ; Diameter of the inner side (52) of the second sealing ring The inner diameter of the third sealing ring positioning groove (25) The same, that is ; The petiole shaft liner (6) comprises a petiole shaft liner body consisting of an upper surface (61) of the petiole shaft liner, an inner surface (62) of the petiole shaft liner, an inner shoulder (63) of the petiole shaft liner, a first outer surface (64) of the petiole shaft liner, a second outer surface (65) of the petiole shaft liner, a third outer surface (66) of the petiole shaft liner and a lower surface (67). The petiole shaft liner (6) is arranged between the blade root disk (2) and the hub.

2. The blade root sealing structure of a dynamic fan rotor according to claim 1 is characterized in that: The blade (1) comprises a blade body consisting of a blade suction surface (10), a blade pressure surface (11), a blade leading edge circular arc surface (12), a blade trailing edge circular arc surface (13), a blade root section (14) and a blade tip section (15).

3. The blade root sealing structure of a dynamic fan rotor according to claim 1, characterized in that: The petiole axis is a cylindrical structure with one end small and the other end large; Height of petiole bushing upper surface (61) Height to top of blade disc bottom groove (27) The same, that is ; Diameter of inner side of petiole lining (62) The inner diameter of the blade disc bottom groove (27) The same, that is ; Height of inner shoulder (63) of petiole bushing , height of the upper surface of the second outer side surface (65) of the petiole bushing Height of the lower surface of the blade root plate (26) are the same, that is ; Diameter of the first outer side (64) of the petiole bushing The inner diameter of the blade disc bottom groove (27) The same, that is ; Height of lower surface of petiole bushing (67) Same height as the lower surface of the wheel hub hole.

4. The blade root sealing structure of a dynamic fan rotor according to claim 3 is characterized in that: Outer diameter of the first sealing ring (3) , the outer diameter of the second sealing ring (4) , the outer diameter of the third sealing ring (5) and the diameter of the third outer side (66) of the petiole bushing are the same, that is ; The outer diameter of the first sealing ring locating shoulder (23) ≤Outer diameter of the first sealing ring (3) .

5. The blade root sealing structure of a dynamic fan rotor according to claim 1, characterized in that: The first sealing ring (3) is made of polytetrafluoroethylene. The second sealing ring (4) is made of copper. The third sealing ring is made of polytetrafluoroethylene.

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