A structure for a dryer shaft end seal

Abstract

The utility model discloses a structure for drying -machine axle end seal relates to drying -machine technical field, the utility model discloses a rotating shaft, sealing assembly, sealing assembly includes the fixed block of being located at the outside of bearing, and the outer ring of bearing is fixedly connected with fixed block, and the inside of fixed block is provided with installation cavity in right of bearing, and the left side of installation cavity inside is equipped with the filler sealing layer of being sleeved in the outside of rotating shaft, and the right of fixed block is equipped with the installation block of being sleeved in the outside of rotating shaft, and the inside of installation block is equipped with positive pressure chamber, the heat dissipation subassembly of being located at the right of sealing assembly, and the heat dissipation subassembly includes the installation sleeve of sliding sleeve joint in the outside of rotating shaft, and the periphery wall of installation sleeve is evenly fixed with fan blade. The utility model improves the sealing effect through nitrogen composition positive pressure, lubricating grease seal and filler seal, and through the heat dissipation of fan blade rotation to sealing assembly, solves the sealing of prior art drying -machine axle end and the problem that the existing technology is easy to cause rotating shaft damage because of friction heat.

Description

Technical Field

[0001] This utility model belongs to the field of dryer technology, and in particular relates to a structure for sealing the shaft end of a dryer. Background Technology

[0002] Currently, industrial dryers on the market have relatively simple shaft end seal designs, making it difficult to adapt to the complex and ever-changing working conditions of chemical plants. In particular, when handling corrosive or toxic media, the sealing effect is poor. In addition, under extreme environments such as high temperature and high pressure, traditional sealing materials are prone to aging and wear, resulting in a significant reduction in service life. For large-scale drying equipment, frequent replacement of sealing materials is not only time-consuming and labor-intensive, but also causes production interruptions, increases maintenance costs, and consequently affects the company's production efficiency and economic benefits, weakening its market competitiveness. Furthermore, the friction at the shaft end of the dryer generates heat, reducing the sealing effect and even causing damage to the rotating shaft.

[0003] To address these issues, we provide a structure for sealing the shaft end of a dryer. Utility Model Content

[0004] The purpose of this invention is to provide a structure for sealing the shaft end of a dryer. It improves the sealing effect by using nitrogen to create positive pressure, grease sealing, and packing sealing, and dissipates heat from the sealing components by rotating fan blades. This solves the problems of poor sealing performance at the shaft end of existing dryers and the easy damage to the rotating shaft due to frictional heat generation.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a structure for sealing the shaft end of a dryer, comprising a rotating shaft, a bearing disposed outside the rotating shaft, the inner ring of the bearing being fixedly connected to the rotating shaft, a sealing assembly, the sealing assembly including a fixing block disposed outside the bearing, the outer ring of the bearing being fixedly connected to the fixing block, an installation cavity being formed inside the fixing block to the right of the bearing, a packing sealing layer being disposed on the left side of the installation cavity and fitted onto the outside of the rotating shaft, an installation block being disposed on the right of the fixing block and fitted onto the rotating shaft with a clearance fit, and a positive pressure cavity being formed inside the installation block; and a heat dissipation assembly disposed to the right of the sealing assembly, the heat dissipation assembly including an installation sleeve slidably fitted onto the outside of the rotating shaft, fan blades being uniformly fixed on the outer peripheral wall of the installation sleeve.

[0007] The present invention is further configured such that a bolt two is threadedly connected to the upper end of the fixing block on the right side of the mounting cavity, a sealing gasket is provided on the right wall of the fixing block, and the mounting block is fixedly connected to the fixing block by a bolt three.

[0008] The present invention is further configured such that a connector is fixedly provided at the upper end of the mounting block, and a through hole is provided on the mounting block at the location of the connector.

[0009] The present invention is further provided in that an installation groove is provided on the left side of the inner peripheral wall of the mounting block, and a sealing ring is provided inside the installation groove and fitted onto the outside of the rotating shaft.

[0010] The present invention is further configured such that an end cap that is clearance-fitted with the rotating shaft is fixed to the left wall of the fixing block by bolts.

[0011] The present invention is further provided that the inner peripheral wall of the mounting sleeve is provided with a mating groove in the axial direction, and a keyway is provided on the rotating shaft corresponding to the location of the mating groove. A connecting key is provided inside the keyway and the mating groove.

[0012] The present invention is further configured such that the outer peripheral wall of the mounting sleeve is threaded with four bolts, and the inner end of the four bolts is inserted into the interior of the rotating shaft.

[0013] This utility model has the following beneficial effects:

[0014] 1. This utility model, by setting a packing sealing layer, a lubricating grease located to the right of the packing sealing layer, and a mounting block, allows high-purity nitrogen gas to enter the positive pressure chamber located on the mounting block, maintaining a positive pressure state inside the positive pressure chamber. This prevents external contaminants from entering and internal media from leaking. The viscosity and filling properties of the lubricating grease further block contaminants and provide lubrication for the moving parts at the shaft end. The packing sealing layer also acts as a final barrier to prevent lubricating grease leakage and accommodate shaft end movement. This results in advantages such as high-efficiency sealing, resistance to high temperature and pressure, strong corrosion resistance, long service life, and convenient maintenance. It is particularly suitable for shaft end sealing requirements under harsh working conditions such as dryers, ensuring reliable operation of equipment in high-temperature, high-pressure, and highly corrosive media environments.

[0015] 2. This utility model, by setting fan blades, drives the mounting sleeve to rotate when the rotating shaft rotates, and drives the mounting sleeve to rotate under the action of the connecting key, thereby causing the fan blades to rotate, which in turn generates airflow that acts on the sealing component to dissipate heat from the sealing component, reducing the possibility of damage to the rotating shaft due to heat dissipation. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is an overall structural diagram of a structure used for sealing the shaft end of a dryer.

[0018] Figure 2This is an internal structural diagram of a structure used for sealing the shaft end of a dryer.

[0019] Figure 3 for Figure 2 Another perspective on the structure.

[0020] Figure 4 This is a diagram showing the connection structure between the heat dissipation component and the rotating shaft.

[0021] Figure 5 for Figure 4 The decomposed structure diagram.

[0022] The attached diagram lists the components represented by each number as follows:

[0023] 1-Rotating shaft, 101-Bearing, 102-Keyway, 2-Sealing assembly, 201-End cap, 201a-Bolt one, 202-Fixing block, 202a-Mounting cavity, 203-Bolt two, 204-Connector, 205-Sealing ring, 206-Mounting block, 206a-Perforation, 206b-Positive pressure cavity, 206c-Mounting groove, 207-Bolt three, 208-Filling sealing layer, 209-Sealing gasket, 3-Heat dissipation assembly, 301-Mounting sleeve, 301a-Matching groove, 302-Fan blade, 303-Connecting key, 304-Bolt four. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1

[0026] Please see Figure 1 , Figure 2 and Figure 3This is the first embodiment of the present invention, which provides a structure for sealing the shaft end of a dryer. It includes a rotating shaft 1, a bearing 101 externally mounted on the rotating shaft 1, the inner ring of the bearing 101 fixedly connected to the rotating shaft 1, and a sealing assembly 2 for sealing the shaft end. The sealing assembly 2 includes a fixing block 202 located outside the bearing 101, the outer ring of the bearing 101 fixedly connected to the fixing block 202, and the fixing block 202 installed at a suitable position on the dryer. A mounting cavity 202a is provided on the right side of the bearing 101 corresponding to the interior of the fixing block 202, providing a platform for the installation of grease and a filler sealing layer 208. A filler sealing layer 208, sleeved on the outside of the rotating shaft 1, is located on the left side inside the mounting cavity 202a. The filler sealing layer 208 is aramid packing, made of high-strength aramid fibers. The main material is a sealing product made of PTFE impregnated with special lubricant. It has excellent wear resistance and lubricity and is suitable for sealing scenarios of easily abrasive media containing solid particles. It can withstand extreme temperature environments from -200℃ to +350℃. To the right of the fixed block 202, there is a mounting block 206 sleeved on the outside of the rotating shaft 1. The mounting block 206 can be circular and is set towards the drying space in the dryer as the first sealing barrier. The mounting cavity 202a to the right of the packing sealing layer 208 is filled with grease as the second sealing barrier. The packing sealing layer 208 serves as the third sealing barrier. The mounting block 206 is clearance-fitted with the rotating shaft 1. The inside of the mounting block 206 is provided with a positive pressure chamber 206b. When high-purity nitrogen enters the positive pressure chamber 206b, the positive pressure chamber 206b is in a positive pressure state to prevent the leakage of contaminants in the dryer.

[0027] Specifically, a bolt 203 is threadedly connected to the upper end of the fixing block 202 on the right side of the mounting cavity 202a. By unscrewing the bolt 203, grease can be injected into the mounting cavity 202a. A sealing gasket 209 is provided on the right wall of the fixing block 202 to prevent grease from leaking between the fixing block 202 and the mounting block 206. The mounting block 206 is fixedly connected to the fixing block 202 by a bolt 3 207.

[0028] A connector 204 is fixedly installed at the upper end of the mounting block 206. A hole is opened inside the connector 204. The hole, the through hole 206a and the positive pressure chamber 206b are connected. A through hole 206a is opened on the mounting block 206 at the location of the connector 204. With the above configuration, after the nitrogen pipeline is connected to the connector 204, high-purity nitrogen passes through the nitrogen pipeline, the hole, the through hole 206a and then enters the positive pressure chamber 206b. Then, the high-purity nitrogen passes through the right side of the mounting block 206 and is discharged between the rotating shaft 1. During this process, the positive pressure chamber 206b is in a positive pressure state to prevent contaminants from entering the mounting block 206.

[0029] A mounting groove 206c is provided on the left side of the inner peripheral wall of the mounting block 206. A sealing ring 205 is provided inside the mounting groove 206c and fitted onto the outside of the rotating shaft 1. This provides a sealing effect between the left peripheral wall of the mounting block 206 and the rotating shaft 1, preventing high-purity nitrogen from entering the mounting cavity 202a and also preventing grease from moving into the mounting cavity 202a.

[0030] The left wall of the fixing block 202 is fixed with an end cap 201 that is clearance-fitted with the rotating shaft 1 by bolt 201a, so as to prevent the bearing 101 from being exposed to the external environment and from being disturbed by external foreign objects.

[0031] The operation process of this embodiment is as follows: Before use, the heat dissipation component 3 is installed on the outside of the rotating shaft 1, and then the sealing component 2 is installed on the outside of the rotating shaft 1. Then, the bolt 203 is loosened, the grease is filled into the mounting cavity 202a, and then the bolt 203 is tightened. Then, the end of the nitrogen pipe is connected to the connector 204.

[0032] In use, the nitrogen delivery equipment delivers high-concentration nitrogen to the nitrogen pipeline. The high-concentration nitrogen passes through the nitrogen pipeline, connector 204, and perforation 206a in sequence and enters the positive pressure chamber 206b, making the positive pressure chamber 206b a positive pressure state. Some of the high-concentration nitrogen passes between the inner peripheral wall on the right side of the mounting block 206 and the rotating shaft 1, preventing contaminants from entering the mounting block 206. The viscosity and filling properties of the grease further block contaminants and provide lubrication for the moving parts at the shaft end. The filler sealing layer 208 also prevents grease leakage and accommodates the movement of the shaft end.

[0033] Example 2

[0034] Please see Figure 1 , Figure 4 and Figure 5 This is the second embodiment of the present invention. This embodiment is based on the previous embodiment, but differs from the first embodiment in that: a heat dissipation component 3 is provided on the right side of the sealing component 2 for heat dissipation of the sealing component 2. The heat dissipation component 3 includes a mounting sleeve 301 that is slidably sleeved on the outside of the rotating shaft 1. Fan blades 302 are uniformly fixed on the outer peripheral wall of the mounting sleeve 301. The rotating shaft 1 drives the mounting sleeve 301 to rotate, so that the fan blades 302 rotate to generate airflow that acts on the sealing component 2 to dissipate heat from the sealing component 2.

[0035] Specifically, the inner circumferential wall of the mounting sleeve 301 is provided with a mating groove 301a, and a keyway 102 is provided on the rotating shaft 1 at the location of the mating groove 301a. A connecting key 303 is provided inside the keyway 102 and the mating groove 301a. With the above arrangement, the two sides of the connecting key 303 are located inside the mating groove 301a and the keyway 102 respectively, so that when the rotating shaft 1 rotates, the mounting sleeve 301 is driven to rotate under the action of the connecting key 303.

[0036] The outer peripheral wall of the mounting sleeve 301 is threaded with bolt 304. The inner end of bolt 304 is inserted into the interior of the rotating shaft 1. The above arrangement prevents the mounting sleeve 301 from moving axially on the rotating shaft 1 by bolt 304.

[0037] The operation process of this embodiment is as follows: When in use, the rotating shaft 1 is in a rotating state. At this time, the rotating shaft 1 rotates and drives the connecting key 303 to rotate, which in turn drives the mounting sleeve 301 to rotate, causing the fan blade 302 to rotate. The rotation of the fan blade 302 generates airflow that acts on the sealing component 2 to dissipate heat from the sealing component 2.

[0038] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A structure for sealing the shaft end of a dryer, comprising a rotating shaft (1), wherein a bearing (101) is provided on the outside of the rotating shaft (1), and the inner ring of the bearing (101) is fixedly connected to the rotating shaft (1), characterized in that: A sealing assembly (2) includes a fixing block (202) disposed outside the bearing (101). The outer ring of the bearing (101) is fixedly connected to the fixing block (202). An installation cavity (202a) is provided inside the fixing block (202) on the right side of the bearing (101). A packing sealing layer (208) sleeved on the outside of the rotating shaft (1) is provided on the left side inside the installation cavity (202a). An installation block (206) sleeved on the outside of the rotating shaft (1) is provided on the right side of the fixing block (202). The installation block (206) is clearance-fitted with the rotating shaft (1). A positive pressure cavity (206b) is provided inside the installation block (206). A heat dissipation assembly (3) is provided to the right of the sealing assembly (2). The heat dissipation assembly (3) includes a mounting sleeve (301) that is slidably sleeved on the outside of the rotating shaft (1). Fan blades (302) are uniformly fixed on the outer peripheral wall of the mounting sleeve (301).

2. The structure for sealing the shaft end of a dryer according to claim 1, characterized in that: The upper end of the fixing block (202) is threaded with bolt two (203) on the right side of the mounting cavity (202a). The right wall of the fixing block (202) is provided with a sealing gasket (209). The mounting block (206) is fixedly connected to the fixing block (202) by bolt three (207).

3. The structure for sealing the shaft end of a dryer according to claim 2, characterized in that: The upper end of the mounting block (206) is fixed with a connector (204), and a through hole (206a) is opened on the mounting block (206) corresponding to the location of the connector (204).

4. The structure for sealing the shaft end of a dryer according to claim 3, characterized in that: The mounting block (206) has a mounting groove (206c) on the left side of its inner peripheral wall, and a sealing ring (205) is provided inside the mounting groove (206c) and fitted onto the outside of the rotating shaft (1).

5. The structure for sealing the shaft end of a dryer according to claim 1, characterized in that: The left wall of the fixed block (202) is fixed with an end cap (201) that is clearance-fitted with the rotating shaft (1) by bolt one (201a).

6. The structure for sealing the shaft end of a dryer according to claim 1, characterized in that: The inner circumferential wall of the mounting sleeve (301) is provided with a mating groove (301a) in the axial direction. A keyway (102) is provided on the rotating shaft (1) corresponding to the location of the mating groove (301a). A connecting key (303) is provided inside the keyway (102) and the mating groove (301a).

7. The structure for sealing the shaft end of a dryer according to claim 6, characterized in that: The outer peripheral wall of the mounting sleeve (301) is threaded with bolt four (304), and the inner end of bolt four (304) is inserted into the interior of the rotating shaft (1).

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