Fan shaft end sealing structure

Abstract

The utility model discloses a fan shaft end sealing structure. A rotating shaft is rotationally installed on a shell. The locking screw penetrates through the baffle and the sealing sleeve to be in threaded connection with the shell, and a sealing cavity is defined by the baffle, the sealing sleeve and the shell. The shaft end of the rotating shaft, the sealing packing and the pressing assembly are all located in the sealing cavity, and the sealing packing is arranged on the rotating shaft in a sleeving mode and located in the sealing sleeve; at least one first screw and at least one second screw which are used for adjusting the pressing assembly are installed on the baffle in a threaded mode. When the sealing effect is affected by abrasion of the sealing packing, the pressing assembly can be adjusted through the screw, the sealing packing is pressed towards the rotating shaft, the inner circumferential face of the sealing packing is tightly matched with the outer circumferential face of the rotating shaft, meanwhile, the side face of the sealing packing and the shell can be pressed, and the sealing effect of the sealing packing is guaranteed. And when the pressing assembly is adjusted, the fan needs to be disassembled and assembled without shutdown, so that the workload is small, the production is not influenced, and the service life of the sealing packing is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of fan shaft end seals, in particular to a fan shaft end seal structure. Background Art

[0002] Since the circulating fan of the cement raw material mill works in a dust environment for a long time, the shaft end seal is severely worn. After the shaft end seal ages or even fails, the shaft end of the circulating fan leaks air severely. After the air leakage of the circulating fan increases, on the one hand, the effective air volume of the circulating system decreases, reducing the operating efficiency of the system. On the other hand, the air leakage will increase the air volume of the system operation, resulting in the system needing to consume more energy to provide sufficient air volume, increasing the energy consumption of the circulating fan.

[0003] At present, the packing seal is used for the fan shaft end seal. After long-term friction between the packing and the fan rotating shaft, the inner and outer circumferential surfaces of the packing, especially the inner circumferential surface, will be enlarged, resulting in an increase in the sealing gap between the packing and the rotating shaft, reducing or even losing the sealing effect. The packing needs to be replaced frequently, which not only has a large workload but also affects production due to downtime. There is an urgent need for a fan shaft end seal structure that can extend the service life of the packing and ensure the sealing effect. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a fan shaft end seal structure to solve the problems that the packing of the fan rotating shaft seal wears quickly, the sealing effect is reduced, the service life is short, the packing needs to be replaced frequently, the workload is large and the production is affected.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A fan shaft end seal structure includes a rotating shaft, a housing, a sealing sleeve, a sealing packing, a pressing component, a baffle and a locking screw;

[0007] The rotating shaft is rotatably installed on the housing;

[0008] The locking screw passes through the baffle and the sealing sleeve and is threadedly connected to the housing, and a sealing cavity is formed by enclosing between the baffle, the sealing sleeve and the housing;

[0009] The shaft end of the rotating shaft, the sealing packing and the pressing component are all located in the sealing cavity, and the sealing packing is sleeved on the rotating shaft and located inside the sealing sleeve;

[0010] At least one first screw and at least one second screw for adjusting the pressing component are threadedly installed on the baffle.

[0011] A further technical solution is that: the pressing assembly includes a tapered sleeve and a pressing block, both the tapered sleeve and the pressing block are slidably fitted with the rotating shaft, the inner ends of the first screw and the second screw are respectively adapted to the side surfaces of the tapered sleeve and the pressing block, the inner tapered surface of the tapered sleeve presses against the outer peripheral surface of the sealing packing, and the pressing block abuts against the outer side surface of the sealing packing.

[0012] A further technical solution is that: the diameter of the pressing block is smaller than the minimum inner diameter of the tapered sleeve.

[0013] A further technical solution is that: the outer diameter of the sealing packing is located between the maximum inner diameter and the minimum inner diameter of the tapered sleeve.

[0014] A further technical solution is that: an expanded neck portion adapted to the tapered sleeve is provided on the inner peripheral surface of the sealing sleeve.

[0015] A further technical solution is that: the first screw and the second screw are ball detent screws.

[0016] Compared with the prior art, at least one of the beneficial effects that the present utility model can achieve is as follows:

[0017] The present utility model provides a sealing structure for the shaft end of a fan. A sealing cavity is formed by enclosing between a baffle, a sealing sleeve and a housing. The sealing packing is located in the sealing cavity and sleeved on the rotating shaft. When the sealing effect is affected by the wear of the sealing packing, the pressing assembly can be adjusted by using the first screw and the second screw to press the sealing packing towards the rotating shaft. The inner peripheral surface of the sealing packing is closely fitted with the outer peripheral surface of the rotating shaft, and at the same time, the side surface of the sealing packing can also be pressed against the housing to ensure the sealing effect of the sealing packing. Moreover, when adjusting the pressing assembly, there is no need to stop the machine or disassemble and assemble the fan, the workload is small, the production is not affected, and the service life of the sealing packing is prolonged. Description of the Drawings

[0018] Figure 1 It is a schematic structural view of a sealing structure for the shaft end of a fan according to the present utility model.

[0019] Figure 2 For the present utility model Figure 1 It is a schematic structural view of the baffle in the present utility model.

[0020] Figure 3 For the present utility model Figure 1 It is a schematic structural view of the tapered sleeve in the present utility model.

[0021] Figure 4 For the present utility model Figure 1 It is a schematic structural view of the pressing assembly in the present utility model.

[0022] Reference numerals: 1, rotating shaft; 2, housing; 3, sealing sleeve; 4, packing; 5, pressing assembly; 6, baffle; 7, locking screw; 8, first screw; 9, second screw; 10, taper sleeve; 11, pressing block. Detailed implementation mode

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. The components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in a variety of different configurations.

[0024] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0025] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0026] It should be noted that like reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0027] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present utility model is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "arranged", "installed", "connected", and "coupled" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0029] Embodiment 1:

[0030] As shown in this embodiment Figure 1 、 Figure 2 and Figure 3 A blower shaft end sealing structure includes a rotating shaft 1, a housing 2, a sealing sleeve 3, a sealing packing 4, a pressing assembly 5, a baffle 6, and a locking screw 7. The rotating shaft 1 is rotatably installed on the housing 2. The locking screw 7 passes through the baffle 6 and the sealing sleeve 3 and is threadedly connected to the housing 2. A sealing cavity is formed by enclosing the baffle 6, the sealing sleeve 3, and the housing 2. The shaft end of the rotating shaft 1, the sealing packing 4, and the pressing assembly 5 are all located in the sealing cavity. The sealing packing 4 is sleeved on the rotating shaft 1 and is located inside the sealing sleeve 3. At least one first screw 8 and at least one second screw 9 for adjusting the pressing assembly 5 are threadedly installed on the baffle 6.

[0031] During assembly, first, the sealing packing 4 and the pressing assembly 5 (which can be an existing annular plate) are sleeved on the rotating shaft 1 in the Figure 1 sequence shown. Then, the baffle 6 and the sealing sleeve 3 are strung together using the locking screw 7, and the locking screw 7 is screwed into the threaded hole on the housing 2. The locking screw 7 presses the baffle 6 and the sealing sleeve 3, and together with the housing 2, a sealing cavity is formed. Then, by means of the screw (the first screw 8 or the second screw 9) on the baffle 6, the pressing assembly 5 is pressed against the sealing packing 4, causing the sealing packing 4 to undergo radial deformation. The sealing packing 4 can be pressed towards the rotating shaft 1. The inner peripheral surface of the sealing packing 4 closely fits with the outer peripheral surface of the rotating shaft 1, and at the same time, the side surface of the sealing packing 4 can also be pressed against the housing 2 to ensure the sealing effect of the sealing packing 4. When the blower has been working for a long time and the sealing effect is affected by the wear of the sealing packing 4, the pressing assembly 5 can be adjusted again by means of the first screw 8 or the second screw 9 to press the sealing packing 4, thereby ensuring the sealing effect of the sealing packing 4. There is no need to stop the machine or disassemble and assemble the blower, the workload is small, production is not affected, and the service life of the sealing packing is extended.

[0032] Preferably, the pressing assembly 5 includes a tapered sleeve 10 and a pressing block 11. Both the tapered sleeve 10 and the pressing block 11 are slidably engaged with the rotating shaft 1. The inner ends of the first screw 8 and the second screw 9 are respectively adapted to the sides of the tapered sleeve 10 and the pressing block 11. The inner conical surface of the tapered sleeve 10 presses against the outer peripheral surface of the sealing packing 4, and the pressing block 11 abuts against the outer side surface of the sealing packing 4. The diameter of the pressing block 11 is smaller than the minimum inner diameter of the tapered sleeve 10. The outer diameter of the sealing packing 4 is located between the maximum inner diameter and the minimum inner diameter of the tapered sleeve 10.

[0033] When using the first screw 8 to individually adjust the depth of the tapered sleeve 10 entering the sealing sleeve 3, the pressing effect of the sealing packing 4 towards the rotating shaft 1 can be individually controlled, and the inner peripheral surface of the sealing packing 4 is closely fitted with the outer peripheral surface of the rotating shaft 1; when using the second screw 9 to individually adjust the depth of the pressing block 11 entering the sealing sleeve 3, the pressing effect of the sealing packing 4 towards the housing 2 can be individually controlled. The aim is to achieve the pressing effect at the worn part, and prevent the sealing packing 4 from being squeezed too tightly, which may cause accelerated wear.

[0034] Preferably, as Figure 4 shown, the inner peripheral surface of the sealing sleeve 3 is provided with an expanded neck portion adapted to the tapered sleeve 10.

[0035] The expanded neck portion facilitates the tapered sleeve 10 to smoothly enter the gap between the inner peripheral surface of the sealing sleeve 3 and the outer peripheral surface of the sealing packing 4.

[0036] Preferably, the first screw 8 and the second screw 9 are ball detent screws.

[0037] The ball detent screws can reduce the friction force with the pressing assembly 5 and improve the service life of the fan shaft end sealing structure.

[0038] Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A fan shaft end sealing structure, characterized in that: It comprises a rotating shaft (1), a housing (2), a sealing sleeve (3), a sealing packing (4), a clamping assembly (5), a baffle (6) and a locking screw (7); The rotating shaft (1) is rotatably mounted on the housing (2); The locking screw (7) passes through the baffle plate (6) and the sealing sleeve (3) and is threadedly connected to the housing (2); a sealed cavity is enclosed between the baffle plate (6), the sealing sleeve (3) and the housing (2); The shaft end of the rotating shaft (1), the sealing packing (4) and the pressing assembly (5) are all located in the sealing cavity, and the sealing packing (4) is sleeved on the rotating shaft (1) and located in the sealing sleeve (3); At least one first screw (8) and at least one second screw (9) for adjusting the pressing assembly (5) are threadedly mounted on the baffle (6).

2. The fan shaft end sealing structure according to claim 1 is characterized in that: The clamping assembly (5) comprises a cone sleeve (10) and a pressure block (11), wherein the cone sleeve (10) and the pressure block (11) are both slidably matched with the rotating shaft (1), the inner ends of the first screw (8) and the second screw (9) are respectively matched with the side surfaces of the cone sleeve (10) and the pressure block (11), the inner conical surface of the cone sleeve (10) presses the outer peripheral surface of the sealing packing (4), and the pressure block (11) abuts against the outer side surface of the sealing packing (4).

3. The fan shaft end sealing structure according to claim 2 is characterized in that: The diameter of the pressing block (11) is smaller than the minimum inner diameter of the cone sleeve (10).

4. The fan shaft end sealing structure according to claim 2, characterized in that: The outer diameter of the sealing packing (4) is between the maximum inner diameter and the minimum inner diameter of the tapered sleeve (10).

5. The fan shaft end sealing structure according to claim 2, characterized in that: The inner circumferential surface of the sealing sleeve (3) is provided with an expanded neck portion adapted to the cone sleeve (10).

6. The fan shaft end sealing structure according to claim 1, characterized in that: The first screw (8) and the second screw (9) are ball screws.

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