Method for eliminating gaps and axial fan

Abstract

The application belongs to the technical field of axial flow fan, and discloses a method for eliminating gap and an axial flow fan. The method for eliminating gap comprises the following steps: S1, dividing a semicircular convex surface into N arc segments in the circumferential direction; S2, selecting a measuring point on each arc segment; S3, measuring the gap at each measuring point; S4, manufacturing N arc segment gaskets, the arc length of the arc segment gasket is designed according to the arc length of the arc segment, and the thickness of the arc segment gasket is designed according to the gap at the measuring point; and manufacturing a semicircular gasket matched with the semicircular convex surface; and S5, fixing and pasting the N arc segment gaskets on the N arc segments one by one in a one-to-one correspondence, and fixing and pasting the semicircular gasket on the outer surface of the N arc segment gaskets. The method for eliminating gap can set arc segment gaskets with different thicknesses according to the gaps of the measuring points to eliminate the gaps, and can manufacture a semicircular gasket to increase the interference amount, so that the complete elimination of the gaps is further ensured, and the assembly precision is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of axial flow fan, in particular to a method for eliminating gap and axial flow fan. BACKGROUND

[0002] The bearing box of the axial flow fan is installed in the casing, the casing comprises an upper casing and a lower casing, and the bearing box is clamped between the support rib plates of the upper casing and the lower casing. The bearing box is provided with a semicircular convex surface at the position where it is attached to the support rib plate of the upper casing, and the support rib plate of the upper casing is provided with a semicircular concave surface. During installation, the bearing box is supported and installed on the support rib plate of the lower casing, the upper casing is buckled on the lower casing and connected by screws, and the semicircular concave surface of the upper casing is attached to the semicircular convex surface of the bearing box.

[0003] Due to changes in environmental temperature, fluid medium temperature and fan shaft power, sudden increase in vibration may occur during operation of the axial flow fan, and the sudden increase in vibration may easily cause the equipment to shut down and affect the safe operation of the entire system.

[0004] Due to installation errors, there is a gap between the semicircular concave surface and the semicircular convex surface, and the existence of the gap may cause the vibration to suddenly increase several times, resulting in weakening of the stiffness of the bearing box and damage, and further affecting the service life of the entire machine equipment.

[0005] In the prior art, in order to prevent damage to the bearing box, the stiffness of the bearing box is generally increased by welding reinforcing ribs, but the effect of increasing the stiffness by this method is limited, and the bearing box is easily deformed during welding, further increasing the gap. SUMMARY

[0006] The present application aims to provide a method for eliminating gap and axial flow fan, which can eliminate the gap between the bearing box and the upper casing to prevent the axial flow fan from being damaged due to excessive vibration during operation.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

[0008] The method for eliminating gap is applied to the axial flow fan, the axial flow fan comprises a bearing box and an upper casing, the bearing box is provided with a semicircular convex surface, the upper casing is provided with a semicircular concave surface attached to the semicircular convex surface, and the method for eliminating gap is used to eliminate the gap between the semicircular convex surface and the semicircular concave surface, which comprises the following steps:

[0009] S1, dividing the semicircular convex surface into N arc segments along the circumferential direction thereof;

[0010] S2, selecting a measuring point on each of the arc segments;

[0011] S3, measuring the gap between the semi-circular convex surface and the semi-circular concave surface at each of the measuring points;

[0012] S4, according to the arc length of each of the arc segments and the gap at the measuring points, producing N arc segment shims corresponding to the arc segments, and according to the arc length of the semi-circular convex surface, producing a semi-circular shim with a set thickness;

[0013] S5, fixing and adhering the N arc segment shims one by one to the N arc segments, and fixing and adhering the semi-circular shim to the outer surface of the N arc segment shims.

[0014] As an optional solution, in step S1, the N arc segments are a first arc segment, a second arc segment, a third arc segment, a fourth arc segment and a fifth arc segment arranged in sequence along the circumferential direction of the semi-circular convex surface, the third arc segment is arranged in the middle and occupies 1 / 3 of the semi-circular convex surface, the second arc segment and the fourth arc segment are symmetrically arranged and each occupies 1 / 6 of the semi-circular convex surface, and the first arc segment and the fifth arc segment are symmetrically arranged and each occupies 1 / 6 of the semi-circular convex surface.

[0015] In step S2, the measuring points include a first measuring point, a second measuring point, a third measuring point, a fourth measuring point and a fifth measuring point respectively located at the first arc segment, the second arc segment, the third arc segment, the fourth arc segment and the fifth arc segment.

[0016] As an optional solution, in step S2, along the circumferential direction of the semi-circular convex surface, the center of the first arc segment is selected as the first measuring point, the center of the second arc segment is selected as the second measuring point, the center of the third arc segment is selected as the third measuring point, the center of the fourth arc segment is selected as the fourth measuring point, and the center of the fifth arc segment is selected as the fifth measuring point.

[0017] As an optional solution, in step S2, the gap at the first measuring point is j1, the gap at the second measuring point is j2, the gap at the third measuring point is j3, the gap at the fourth measuring point is j4, and the gap at the fifth measuring point is j5.

[0018] In step S4, the N arc segment shims include a first arc segment shim, a second arc segment shim, a third arc segment shim, a fourth arc segment shim and a fifth arc segment shim corresponding to the first arc segment, the second arc segment, the third arc segment, the fourth arc segment and the fifth arc segment respectively;

[0019] The thickness h1 of the first arc segment shim is (j1+j5) / 2;

[0020] The thickness h2 of the second arc segment gasket is (j2+j4) / 2;

[0021] The thickness h3 of the third arc segment gasket is j3;

[0022] The thickness h4 of the fourth arc segment gasket is (j2+j4) / 2;

[0023] The thickness h5 of the fifth arc segment gasket is (j1+j5) / 2.

[0024] As an option, the gap j1 at the first measuring point, the gap j2 at the second measuring point, the gap j3 at the third measuring point, the gap j4 at the fourth measuring point, and the gap j5 at the fifth measuring point are all average values after multiple measurements.

[0025] As an option, in step S4, the N arc segment gaskets include a first arc segment gasket, a second arc segment gasket, a third arc segment gasket, a fourth arc segment gasket, and a fifth arc segment gasket corresponding to the first arc segment, the second arc segment, the third arc segment, the fourth arc segment, and the fifth arc segment, respectively.

[0026] The arc length c1 of the first arc segment gasket is πD / 12-A;

[0027] The arc length c2 of the second arc segment gasket is πD / 12-A;

[0028] The arc length c3 of the third arc segment gasket is πD / 6-A;

[0029] The arc length c4 of the fourth arc segment gasket is πD / 12-A;

[0030] The arc length c5 of the fifth arc segment gasket is πD / 12-A;

[0031] Wherein, D is the diameter of the semicircular arc convex surface, and A is a positive number less than or equal to 20.

[0032] As an option, in step S6, the thickness h0 of the semicircular arc gasket is set in the range of 0.1mm-0.5mm;

[0033] The arc length c0 of the semicircular arc gasket is πD / 2-A, wherein D is the diameter of the semicircular arc convex surface, and A is a positive number less than or equal to 20.

[0034] As an option, in step S3, the gap at each measuring point is measured by lead wire method.

[0035] As an option, in step S5, the arc segment gaskets are bonded to the corresponding arc segments with glue, and the semicircular arc gasket is bonded to the outer surface of the N arc segment gaskets with glue.

[0036] The axial flow fan adopts the method for eliminating the gap as described in any of the above solutions to eliminate the gap between the bearing box and the upper casing.

[0037] The present application has the following beneficial effects:

[0038] The method for eliminating the gap provided by the present application divides the semicircular convex surface into N arc segments, selects measuring points on each arc segment, and measures the gap, and then produces arc segment gaskets according to the arc length of each arc segment and the gap, so that the arc segment gaskets of different thicknesses can be set according to the gaps of the measuring points to eliminate the gap, and the semicircular arc gasket is produced to increase the interference amount, further ensuring that the gap is completely eliminated, and improving the assembly precision. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 is a structural schematic view of the hidden upper casing of the axial flow fan provided by the embodiment of the present application;

[0040] Figure 2 is a flow chart of the method for eliminating the gap provided by the embodiment of the present application;

[0041] Figure 3 is a structural schematic view of a part of the semicircular convex surface of the bearing box involved in the embodiment of the present application;

[0042] Figure 4 is a structural schematic view of the arc segment gasket fixedly attached to the semicircular convex surface of the bearing box involved in the embodiment of the present application;

[0043] Figure 5 is a structural schematic view of the arc segment gasket and the semicircular arc gasket involved in the embodiment of the present application.

[0044] In the drawings:

[0045] 1, bearing box; 11, arc segment; 111, first arc segment; 112, second arc segment; 113, third arc segment; 114, fourth arc segment; 115, fifth arc segment;

[0046] R1, first measuring point; R2, second measuring point; R3, third measuring point; R4, fourth measuring point; R5, fifth measuring point;

[0047] 2, lower casing;

[0048] 3, arc segment gasket; 31, first arc segment gasket; 32, second arc segment gasket; 33, third arc segment gasket; 34, fourth arc segment gasket; 35, fifth arc segment gasket;

[0049] 4, semicircular arc gasket;

[0050] 5, impeller member. DETAILED DESCRIPTION

[0051] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like component have the same or similar designations. The embodiments described below are exemplary in nature, and are intended to be illustrative of the present application rather than to limit the same.

[0052] In the description of the present application, unless otherwise clearly specified and limited, the terms "connection", "connected", "fixed", should be understood broadly, for example, can be fixed connection, can also be detachable connection, can be mechanical connection, can also be electrical connection, can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0053] In the description of the present application, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature can include that the first feature and the second feature are in direct contact, or can include that the first feature and the second feature are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "over" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0054] The technical solutions of the present application are further illustrated below in conjunction with the drawings and through specific embodiments.

[0055] The embodiment of the present application provides a gap elimination method applied to an axial flow fan. Figure 1 As shown in the figure, the axial flow fan comprises a bearing box 1, an upper casing, a lower casing 2 and an impeller member 5, the upper casing and the lower casing 2 are connected by screwing and buckling, the bearing box 1 is arranged in the upper casing and the lower casing 2, the impeller member 5 is arranged on both sides of the upper casing and the lower casing 2, and at the position where the bearing box 1 and the upper casing contact, the bearing box 1 is provided with a semicircular convex surface, and the upper casing is provided with a semicircular concave surface, the semicircular convex surface can be fitted with the semicircular concave surface to limit the bearing box 1. However, due to machining or assembly errors, there is a gap between the semicircular convex surface and the semicircular concave surface, in order to eliminate the gap between the semicircular convex surface and the semicircular concave surface, the gap elimination method is used to solve the above problems.

[0056] Specifically, as shown in the figure, Figures 2-5As shown, the method for eliminating the gap comprises the following steps: S1, dividing the semicircular convex surface into N arc segments 11 along the circumferential direction; S2, selecting a measuring point on each arc segment 11; S3, measuring the gap between the semicircular convex surface and the semicircular concave surface at each measuring point; during the measurement, the bearing box 1 is installed on the lower casing 2, N measuring tools are fixed at the N measuring points respectively, and then the upper casing is connected and fastened with the lower casing 2, at this time the measuring tools can measure the gap at the corresponding measuring points; S4, manufacturing N arc segment shims 3, the arc length of the arc segment shims 3 is designed according to the arc length of the arc segments 11, and the thickness of the arc segment shims 3 is designed according to the gap at the measuring points; and manufacturing a semicircular arc shim 4 matched with the semicircular convex surface, the arc length of the semicircular arc shim 4 is designed according to the arc length of the semicircular convex surface, and the thickness is a set value; S5, fixing and attaching the N arc segment shims 3 one by one on the N arc segments 11, and fixing and attaching the semicircular arc shim 4 on the outer surface of the N arc segment shims 3, when the upper casing is fixed and connected with the lower casing, the gap between the semicircular convex surface and the semicircular concave surface is eliminated through the arc segment shims 3 and the semicircular arc shim 4 attached to the outer surface of the N arc segment shims 3. By adding a semicircular arc shim 4, the semicircular convex surface and the semicircular concave surface can have an interference amount, so as to ensure that the gap is completely eliminated.

[0057] It can be understood that the gap at each point in the entire attached semicircular convex surface and semicircular concave surface can be different, by dividing the semicircular convex surface into N arc segments 11 and selecting a measuring point on each arc segment 11, and measuring the gap, then manufacturing arc segment shims 3 according to the arc length and the gap of each arc segment 11, so that the arc segment shims 3 of different thicknesses can be set according to the gap at each measuring point to eliminate the gap, and the semicircular arc shim 4 is manufactured to increase the interference amount, further ensuring that the gap is completely eliminated, and improving the assembly precision.

[0058] Specifically, in step S1, the N arc segments 11 include a first arc segment 111, a second arc segment 112, a third arc segment 113, a fourth arc segment 114, and a fifth arc segment 115 arranged in sequence along the circumferential direction of the semicircular convex surface, the third arc segment 113 is arranged in the middle and occupies 1 / 3 of the semicircular convex surface, the second arc segment 112 and the fourth arc segment 114 are symmetrically arranged and each occupies 1 / 6 of the semicircular convex surface, and the first arc segment 111 and the fifth arc segment 115 are symmetrically arranged and each occupies 1 / 6 of the semicircular convex surface. In step S2, the measuring points include a first measuring point R1, a second measuring point R2, a third measuring point R3, a fourth measuring point R4, and a fifth measuring point R5, the first measuring point R1, the second measuring point R2, the third measuring point R3, the fourth measuring point R4, and the fifth measuring point R5 are respectively located at the first arc segment 111, the second arc segment 112, the third arc segment 113, the fourth arc segment 114, and the fifth arc segment 115, the gap between the semicircular convex surface and the semicircular concave surface at the first measuring point R1 is j1, the gap between the semicircular convex surface and the semicircular concave surface at the second measuring point R2 is j2, the gap between the semicircular convex surface and the semicircular concave surface at the third measuring point R3 is j3, the gap between the semicircular convex surface and the semicircular concave surface at the fourth measuring point R4 is j4, and the gap between the semicircular convex surface and the semicircular concave surface at the fifth measuring point R5 is j5. By dividing the semicircular convex surface into five arc segments 11 according to the above layout, the design of the arc segment gasket 3 is more simple and convenient, and the clearance elimination requirement is met.

[0059] In order to make the selection of measuring points more reasonable and the measured gap value more representative, along the circumferential direction of the semicircular convex surface, the center of the first arc segment 111 is selected as the first measuring point R1, the center of the second arc segment 112 is selected as the second measuring point R2, the center of the third arc segment 113 is selected as the third measuring point R3, the center of the fourth arc segment 114 is selected as the fourth measuring point R4, and the center of the fifth arc segment 115 is selected as the fifth measuring point R5. By selecting the center of each arc segment 11 as a measuring point, the measurement result is more reliable.

[0060] Specifically, in step S4, the N arc segment shims 3 include a first arc segment shim 31, a second arc segment shim 32, a third arc segment shim 33, a fourth arc segment shim 34 and a fifth arc segment shim 35 corresponding to the first arc segment 111, the second arc segment 112, the third arc segment 113, the fourth arc segment 114 and the fifth arc segment 115 respectively. The thickness h1 of the first arc segment shim 31 and the thickness h5 of the fifth arc segment shim are equal, i.e. h1 = h5 = (j1 + j5) / 2, that is, h1 and h5 are both the average of the gap at the first measuring point R1 and the gap at the fifth measuring point R5; the thickness h2 of the second arc segment shim 32 and the thickness h4 of the fourth arc segment shim 34 are equal, i.e. h2 = h4 = (j2 + j4) / 2, that is, h2 and h4 are both the average of the gap at the second measuring point R2 and the gap at the fourth measuring point R4; the thickness h3 of the third arc segment shim 33 is j3, that is, h3 is the gap at the third measuring point R3.

[0061] Further, in order to further improve the accuracy of the gap measurement, the gap j1 at the first measuring point R1, the gap j2 at the second measuring point R2, the gap j3 at the third measuring point R3, the gap j4 at the fourth measuring point R4 and the gap j5 at the fifth measuring point R5 are all the average values after multiple measurements. In this embodiment, three measurements can meet the requirements.

[0062] Specifically, the arc length c1 of the first arc segment shim 31, the arc length c2 of the second arc segment shim 32, the arc length c4 of the fourth arc segment shim 34 and the arc length c5 of the fifth arc segment shim 35 are all equal, i.e. c1 = c2 = c4 = c5 = πD / 12 - A; the arc length c3 of the third arc segment shim 33 is πD / 6 - A; wherein D is the diameter of the semicircular convex surface, and A is a positive number less than or equal to 20 mm. By subtracting a positive number less than or equal to 20 from the arc length of the arc segment 11, the arc length of the arc segment shim 3 is smaller than the arc length of the corresponding arc segment 11, so as to ensure that the arc segment shim 3 can completely fit the corresponding arc segment 11. In this embodiment, A is 10.

[0063] Specifically, the thickness h0 of the semicircular arc shim 4 is set in the range of 0.1 mm-0.5 mm, and by adding a semicircular arc shim 4 with a range of 0.1 mm-0.5 mm to the outer surface of the arc segment shim 3, the design of the interference amount is more reasonable. In this embodiment, h0 = 0.3 mm.

[0064] Specifically, the arc length c0 of the semicircular arc shim 4 is πD / 2 - A, i.e. subtracting a positive number less than or equal to 20 from the arc length of the semicircular convex surface, so that the semicircular arc shim 4 can completely fit the semicircular convex surface.

[0065] Further, the arc segment gaskets 3 are bonded to the corresponding arc segments 11 by glue; and the semicircular arc gaskets 4 are bonded to the outer surfaces of the N arc segment gaskets 3 by glue. By fixing through glue, the sliding of the arc segment gaskets 3 and the semicircular arc gaskets 4 can be effectively prevented without increasing the thickness as much as possible.

[0066] After the arc segment gaskets 3 and the semicircular arc gaskets 4 are pasted, the upper casing is hoisted to the bearing box 1, and the upper casing and the lower casing 2 are fixedly connected.

[0067] Optionally, in step S3, the lead wire method is used to measure the gap between the semicircular arc convex surface and the semicircular arc concave surface at each measuring point, that is, the measuring tool uses a lead wire, the lead wire is fixed at each measuring point before the upper casing is installed, then the upper casing is installed and fixed with the lower casing 2, the lead wire is clamped between the semicircular arc convex surface and the semicircular arc concave surface, and the lead wire is flattened, and the thickness of the lead wire is the numerical value of the gap.

[0068] The embodiment of the application also provides a axial flow fan, which uses the above-mentioned method for eliminating the gap to eliminate the gap between the bearing box 1 and the upper casing, thereby improving the service life of the bearing box 1 and the stability of the axial flow fan.

[0069] Obviously, the above-mentioned embodiments of the application are only examples for clearly illustrating the application, and are not intended to limit the implementation modes of the application. Based on the above-mentioned description, other different forms of changes or variations can be made by those skilled in the art. It is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement made within the spirit and principle of the application should be included in the protection scope of the claims of the application.

Claims

1. A method of eliminating gaps, characterized by, The method is applied to eliminate the gap between the semi-circular convex surface and the semi-circular concave surface of the bearing box (1) and the upper casing of the axial flow fan, and comprises the following steps: S1, dividing the semi-circular convex surface into N arc segments (11) along the circumferential direction thereof; S2, selecting a measuring point on each of the arc segments (11); S3, measuring the gap between the semi-circular convex surface and the semi-circular concave surface at each of the measuring points; S4, according to the arc length of each of the arc segments (11) and the gap at the measuring point, N arc segment gaskets (3) corresponding to the arc segments (11) are made, and a semi-circular gasket (4) with a thickness of a set value is made according to the arc length of the semi-circular convex surface; S5, N arc segment gaskets (3) are fixedly attached to N arc segments (11) one by one, and the semi-circular gasket (4) is fixedly attached to the outer surface of the N arc segment gaskets (3).

2. The method for eliminating the gap according to claim 1, wherein in step S1, the N arc segments (11) are a first arc segment (111), a second arc segment (112), a third arc segment (113), a fourth arc segment (114) and a fifth arc segment (115) sequentially distributed along the circumferential direction of the semi-circular convex surface, the third arc segment (113) is arranged in the middle and occupies 1 / 3 of the semi-circular convex surface, the second arc segment (112) and the fourth arc segment (114) are symmetrically arranged and each occupies 1 / 6 of the semi-circular convex surface, and the first arc segment (111) and the fifth arc segment (115) are symmetrically arranged and each occupies 1 / 6 of the semi-circular convex surface; In step S2, the measuring points include a first measuring point (R1), a second measuring point (R2), a third measuring point (R3), a fourth measuring point (R4) and a fifth measuring point (R5) respectively located in the first arc segment (111), the second arc segment (112), the third arc segment (113), the fourth arc segment (114) and the fifth arc segment (115). In step S2, along the circumferential direction of the semi-circular convex surface, the center of the first arc segment (111) is selected as the first measuring point (R1), the center of the second arc segment (112) is selected as the second measuring point (R2), the center of the third arc segment (113) is selected as the third measuring point (R3), the center of the fourth arc segment (114) is selected as the fourth measuring point (R4), and the center of the fifth arc segment (115) is selected as the fifth measuring point (R5).

3. The method of eliminating gaps according to claim 2, wherein, 4. The method for eliminating the gap according to claim 2, wherein ​ In step S2, the gap at the first measuring point (R1) is j1, the gap at the second measuring point (R2) is j2, the gap at the third measuring point (R3) is j3, the gap at the fourth measuring point (R4) is j4, and the gap at the fifth measuring point (R5) is j5. In step S4, the N arc segment gaskets (3) include a first arc segment gasket (31), a second arc segment gasket (32), a third arc segment gasket (33), a fourth arc segment gasket (34), and a fifth arc segment gasket (35) corresponding to the first arc segment (111), the second arc segment (112), the third arc segment (113), the fourth arc segment (114), and the fifth arc segment (115) respectively. The thickness h1 of the first arc segment gasket (31) is (j1+j5) / 2. The thickness h2 of the second arc segment gasket (32) is (j2+j4) / 2. The thickness h3 of the third arc segment gasket (33) is j3. The thickness h4 of the fourth arc segment gasket (34) is (j2+j4) / 2. The thickness h5 of the fifth arc segment gasket (35) is (j1+j5) / 2.

5. The method of eliminating gaps according to claim 4, wherein, The gap j1 at the first measuring point (R1), the gap j2 at the second measuring point (R2), the gap j3 at the third measuring point (R3), the gap j4 at the fourth measuring point (R4), and the gap j5 at the fifth measuring point (R5) are all average values after multiple measurements.

6. The method of eliminating gaps according to claim 2, wherein, In step S4, the N arc segment gaskets (3) include a first arc segment gasket (31), a second arc segment gasket (32), a third arc segment gasket (33), a fourth arc segment gasket (34), and a fifth arc segment gasket (35) corresponding to the first arc segment (111), the second arc segment (112), the third arc segment (113), the fourth arc segment (114), and the fifth arc segment (115) respectively. The arc length c1 of the first arc segment gasket (31) is πD / 12-A. The arc length c2 of the second arc segment gasket (32) is πD / 12-A. The arc length c3 of the third arc segment gasket (33) is πD / 6-A. The arc length c4 of the fourth arc segment gasket (34) is πD / 12-A. The arc length c5 of the fifth arc segment gasket (35) is πD / 12-A. Wherein, D is the diameter of the semicircular convex surface, and A is a positive number less than or equal to 20.

7. The method of eliminating gaps of claim 1, wherein, In step S6, the thickness h0 of the semicircular arc gasket (4) is set in the range of 0.1mm-0.5mm. The arc length c0 of the semicircular arc gasket (4) is πD / 2-A, wherein D is the diameter of the semicircular convex surface, and A is a positive number less than or equal to 20.

8. The method of eliminating gaps of claim 1, wherein, In step S3, the gap at each measuring point is measured by lead wire method.

9. The method of eliminating gaps of claim 1, wherein, In step S5, the arc segment gasket (3) is bonded to the corresponding arc segment (11) by glue, and the semicircular arc gasket (4) is bonded to the outer surface of the N arc segment gaskets (3) by glue.

10. An axial fan characterised in that The method for eliminating the gap according to any one of claims 1-9 is used to eliminate the gap between the bearing box (1) and the upper shell.

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