Sealing structure for fan shaft

Abstract

The utility model relates to a sealing structure for a fan shaft. The sealing structure for the fan shaft comprises the fan shaft and a fan shell, and further comprises a half-section type bottom plate with a groove and a half-section type gland with a boss, and the outer diameter of the boss is matched with the inner diameter of the groove; the depth of the groove is larger than the protruding height of the boss, so that after the half-section type gland covers the half-section type bottom plate, the half-section type gland, the half-section type bottom plate and the outer wall of the fan shaft form a sealing groove. The sealing groove is filled with the sealing filler, so that airflow in the fan is prevented from leaking outwards, then the half-section type bottom plate and the half-section type gland are connected and fixed through the bolt to form an integrated structure, and the sealing filler is prevented from being extruded to run out of the sealing groove in the operation process; and finally, the half-section type bottom plate is fixed to the fan shell in a spot welding mode, so that the fan shaft, the half-section type bottom plate, the half-section type gland and the fan shell form a sealing structure, the air leakage phenomenon is avoided, and then the load and the energy consumption are reduced.

Description

Technical Field

[0001] The present application relates to the technical field of sealing structures, and in particular to a sealing structure for a fan shaft. Background Art

[0002] The high temperature fan of cement plant plays a very important role in the cement production process. It can not only realize the transfer and exchange of heat and adjust the thermal environment, but also control the airflow, realize the transportation of raw materials and fuels, treat waste gas and utilize waste heat, and ensure the quality and environmental protection requirements of cement production. Therefore, the high temperature fan of cement plant is one of the indispensable important equipment in the cement production process.

[0003] However, during the operation of the fan, air leakage will occur at the connection between the fan shaft and the casing, causing an increase in the system load and resulting in increased energy consumption. Utility Model Content

[0004] In order to solve or partially solve the problems existing in the related art, the present application provides a sealing structure for a fan shaft.

[0005] To achieve the above objectives, this application is implemented through the following technical solutions:

[0006] A sealing structure for a fan shaft comprises a fan shaft and a fan housing, wherein the sealing structure for the fan shaft further comprises:

[0007] A half-cut bottom plate with a groove, wherein a first through hole for allowing the fan shaft to pass through is opened in the middle of the groove, and a gap is provided between the top of the groove and the outer wall of the fan shaft;

[0008] A half-cut gland with a boss, a second through hole for allowing the fan shaft to pass through is opened in the middle of the boss, and the outer diameter of the boss matches the inner diameter of the groove;

[0009] The groove depth of the groove is greater than the protruding height of the boss, so that after the half-section pressure cover is covered on the half-section base plate, the two and the outer wall of the fan shaft form a sealing groove, and a sealing filler is arranged in the sealing groove.

[0010] Optionally, the half-section bottom plate and the half-section pressure cover are provided with screw holes for allowing fixing bolts to pass through, and there are a plurality of screw holes.

[0011] Optionally, the apertures of the first through hole and the second through hole are larger than the outer diameter of the fan shaft, and a circumferential gap of 3 to 5 mm is provided between the first through hole, the second through hole and the outer wall of the fan shaft.

[0012] Optionally, the apertures of the first through hole and the second through hole are 307 mm, and the outer diameters of the half-section bottom plate and the half-section gland are 507 mm.

[0013] Optionally, there are 12 fixing bolts.

[0014] Optionally, the sealing filler is graphite packing.

[0015] Optionally, the sealing filler is ceramic fiber packing.

[0016] The beneficial effects of the present application are as follows: since the groove depth of the groove is greater than the protruding height of the boss, when the half-section pressure cover is covered on the half-section base plate, the two and the outer wall of the fan shaft form a closed space, and the closed space is the sealing groove. The sealing filler is filled in the sealing groove to prevent the airflow in the fan from leaking outward, and then the half-section base plate and the half-section pressure cover are connected and fixed by bolts to form an integrated structure to prevent the sealing filler from being squeezed out of the sealing groove during operation. Finally, the half-section base plate is fixed to the fan casing by spot welding, so that the fan shaft, the half-section base plate, the half-section pressure cover and the fan casing form a sealing structure, thereby avoiding air leakage, thereby reducing the load and reducing energy consumption.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0019] Figure 1 is a side view of a sealing structure for a fan shaft shown in an embodiment of the present application;

[0020] Figure 2 is a front view of a sealing structure for a fan shaft shown in an embodiment of the present application;

[0021] Figure 3 is a structural diagram of a half-section bottom plate shown in an embodiment of the present application;

[0022] Figure 4 It is a structural diagram of a half-sectioned gland shown in an embodiment of the present application.

[0023] Reference numerals: 1 fan shaft, 2 fan housing, 3 half-section bottom plate, 4 first through hole, 5 half-section gland, 6 second through hole, 7 sealing groove. DETAILED DESCRIPTION

[0024] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific situation.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0029] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0030] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0031] In order to make the purpose, technical solutions and beneficial effects of the present application clearer, the preferred embodiments of the present application will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technical personnel.

[0032] Embodiment 1:

[0033] See also Figure 1 , Figure 2 A sealing structure for a fan shaft comprises a fan shaft 1 and a fan housing 2, wherein the sealing structure for the fan shaft further comprises:

[0034] A half-cut bottom plate 3 having a groove, wherein a first through hole 4 for allowing the fan shaft 1 to pass through is opened in the middle of the groove, and a gap is provided between the top of the groove and the outer wall of the fan shaft 1;

[0035] A half-cut gland 5 with a boss, a second through hole 6 for allowing the fan shaft 1 to pass through is opened in the middle of the boss, and the outer diameter of the boss matches the inner diameter of the groove;

[0036] The groove depth of the groove is greater than the protruding height of the boss, so that after the half-section pressure cover 5 is covered on the half-section base plate 3, the two and the outer wall of the fan shaft 1 form a sealing groove 7, and a sealing filler is provided in the sealing groove 7.

[0037] Specifically, one end face of the half-section bottom plate 3 is a plane, which is fixedly connected to the fan housing 2 by spot welding, and the other end face of the half-section bottom plate 3 has a groove, the inner diameter of the groove is larger than the aperture of the first through hole 4, so that when the fan shaft 1 is inserted into the first through hole 4, a gap is formed between the top of the groove and the outer wall of the fan shaft 1, and the thickness of the gap is consistent with the thickness of the sealing filler;

[0038] One end face of the half-section gland 5 is a plane, and the other end face has a boss, the outer diameter of the boss is larger than the aperture of the second through hole 6, and the outer diameter of the boss matches the inner diameter of the groove, so that when the fan shaft 1 is passed through the second through hole 6 and the half-section gland 5 is pushed, the boss can be embedded in the groove, so that the half-section gland 5 is covered on the half-section bottom plate 3;

[0039] Since the groove depth is greater than the protruding height of the boss, when the half-section pressure cover 5 is covered on the half-section base plate 3, the two and the outer wall of the fan shaft 1 form a closed space, and the closed space is the sealing groove 7. The sealing filler is filled in the sealing groove 7 to prevent the airflow in the fan from leaking outward, and then the half-section base plate 3 and the half-section pressure cover 5 are connected and fixed by bolts to form an integrated structure to prevent the sealing filler from being squeezed out of the sealing groove 7 during operation. Finally, the half-section base plate 3 is fixed to the fan housing 2 by spot welding, so that the fan shaft 1, the half-section base plate 3, the half-section pressure cover 5 and the fan housing 2 form a sealing structure, thereby avoiding air leakage, thereby reducing the load and reducing energy consumption.

[0040] It should be noted that after the packing is installed in the sealing groove 7, it is axially compressed by the gland bolts. When the fan shaft 1 and the packing have relative movement, due to the plasticity of the packing, it generates radial force and is in close contact with the fan shaft 1. At the same time, the lubricant impregnated in the packing is squeezed out to form an oil film between the contact surfaces. Since the contact state is not particularly uniform, the contact part will appear "boundary lubrication" state, which is called "bearing effect"; and the uncontacted concave part forms a small oil groove with a thicker oil film. The contact part and the non-contact part form an irregular maze, which plays a role in preventing liquid leakage, which is called "maze effect". For this reason, it is necessary to frequently adjust the packing's compression degree so that after the lubricant in the packing is lost for a period of operation, some lubricant can be squeezed out, and at the same time, the packing's compression force relaxation caused by the volume change can be compensated. Obviously, such frequent squeezing of the packing will eventually exhaust the impregnant, so it is necessary to replace the sealing packing regularly. In addition, in order to maintain the liquid film and take away the friction heat, it is also necessary to intentionally allow a small amount of leakage at the packing.

[0041] Embodiment 2:

[0042] See also Figure 1 , Figure 2 , Figure 3 and Figure 4 Based on the first embodiment, further and optionally, the half-section bottom plate 3 and the half-section pressure cover 5 are provided with screw holes for allowing fixing bolts to pass through, and the screw holes are provided with a plurality of screw holes.

[0043] Specifically, the screw holes opened on the half-section base plate 3 correspond one to one with the screw holes opened on the half-section pressure cover 5. By screwing the fixing bolts into the screw holes, the half-section base plate 3 and the half-section pressure cover 5 are connected and fixed into an integrated structure to prevent the sealing packing from being squeezed out of the sealing groove 7 during operation. By screwing the fixing bolts out of the screw holes, the half-section base plate 3 and the half-section pressure cover 5 are separated, thereby facilitating the replacement of the sealing packing.

[0044] Further and optionally, the apertures of the first through hole 4 and the second through hole 6 are larger than the outer diameter of the fan shaft 1 , and a circumferential gap of 3 to 5 mm is provided between the first through hole 4 , the second through hole 6 and the outer wall of the fan shaft 1 .

[0045] Specifically, the aperture sizes of the first through hole 4 and the second through hole 6 are consistent, and the aperture sizes of the first through hole 4 and the second through hole 6 are selected according to the outer diameter of the fan shaft 1. Considering the vibration and thermal expansion factors of the fan shaft 1, the apertures of the first through hole 4 and the second through hole 6 are generally slightly larger than the outer diameter of the fan shaft 1, ensuring that there is a circumferential gap of 3 to 5 mm between the two and the outer wall of the fan shaft 1.

[0046] Further and optionally, the diameters of the first through hole 4 and the second through hole 6 are 307 mm, and the outer diameters of the half-section bottom plate 3 and the half-section pressure cover 5 are 507 mm.

[0047] Specifically, in this embodiment, the apertures of the first through hole 4 and the second through hole 6 are 307 mm to match the outer diameter of the fan shaft 1, and the outer diameters of the half-section base plate 3 and the half-section pressure cover 5 are 507 mm to match the installation space.

[0048] Further and optionally, there are 12 fixing bolts.

[0049] Specifically, 12 fixing bolts are evenly distributed on the half-section gland 5 to ensure the connection strength.

[0050] Further and optionally, the sealing filler 8 is a graphite packing.

[0051] Specifically, considering that the sealing packing 8 will generate a high temperature when the fan shaft 1 rotates, graphite packing is selected as the packing. The graphite packing is mainly composed of a mixture of graphite, graphite fiber and other refractory materials. Its fibrous structure is finer than that of traditional asbestos packing, so it has a stronger high temperature resistance, up to about 3000°C. Moreover, since it does not contain asbestos, the overall health of the graphite packing is higher, it will not cause harm to the human body, and it has the advantages of high temperature resistance, corrosion resistance, wear resistance, and good insulation.

[0052] Further and optionally, the sealing filler 8 is ceramic fiber packing.

[0053] Specifically, considering that the sealing structure formed by the fan shaft 1, the half-section base plate 3, the half-section gland 5 and the fan housing 2 is a dynamic sealing structure, ceramic fiber packing is used as filler. The ceramic fiber packing is precision-processed from high-quality fiber synthetic silk, has high strength, high temperature resistance, low density, low thermal conductivity, good insulation and non-combustibility, and is more suitable for dynamic sealing structures.

[0054] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A sealing structure for a fan shaft, comprising a fan shaft (1) and a fan housing (2), characterized in that: The sealing structure for the fan shaft also includes: A half-cut bottom plate (3) having a groove, wherein a first through hole (4) is provided in the middle of the groove for allowing the fan shaft (1) to pass through, and a gap is provided between the top of the groove and the outer wall of the fan shaft (1); A half-cut gland (5) having a boss, wherein a second through hole (6) is provided in the middle of the boss to allow the fan shaft (1) to pass through, and the outer diameter of the boss matches the inner diameter of the groove; The groove depth of the groove is greater than the protruding height of the boss, so that after the half-section pressure cover (5) is covered on the half-section base plate (3), the two and the outer wall of the fan shaft (1) form a sealing groove (7), and a sealing filler is provided in the sealing groove (7).

2. The sealing structure for a fan shaft according to claim 1, characterized in that: The half-section bottom plate (3) and the half-section pressure cover (5) are provided with screw holes for allowing fixing bolts to pass through, and a plurality of the screw holes are provided.

3. The sealing structure for a fan shaft according to claim 1, characterized in that: The apertures of the first through hole (4) and the second through hole (6) are larger than the outer diameter of the fan shaft (1), and a circumferential gap of 3 to 5 mm is provided between the first through hole (4), the second through hole (6) and the outer wall of the fan shaft (1).

4. The sealing structure for a fan shaft according to claim 3, characterized in that: The diameters of the first through hole (4) and the second through hole (6) are 307 mm, and the outer diameters of the half-section bottom plate (3) and the half-section gland (5) are 507 mm.

5. The sealing structure for a fan shaft according to claim 2, characterized in that: There are 12 fixing bolts.

6. The sealing structure for a fan shaft according to claim 1, characterized in that: The sealing filler is graphite packing.

7. The sealing structure for a fan shaft according to claim 1, characterized in that: The sealing filler is ceramic fiber packing.

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