Labyrinth type lower sealing device for coal mill base

Abstract

The utility model provides a labyrinth type lower sealing device for a coal mill base, which relates to the technical field of sealing devices and comprises a coal mill lower frame body, and a mounting plate is arranged on one side of the outer wall of the coal mill lower frame body. Under the interaction of a series of components, the first wear-resistant layer and the second wear-resistant layer can reduce friction force, reduce surface wear and prolong the service life of a sealing piece, the high-temperature-resistant layer can keep good elasticity and shape stability at high temperature, it is ensured that the sealing effect is not affected, the elastic layer can keep the elasticity and rebound resilience of the structure, and the service life of the sealing piece is prolonged. According to the sealing device, the sealing gap can be correctly filled after installation, the lasting sealing performance is provided, the absorbing layer can absorb part of energy when being subjected to external impact or vibration, damage to the sealing piece is reduced, the service life of the sealing piece is prolonged, the service life of the sealing device can be prolonged through the structure, and the maintenance and replacement cost is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing devices, in particular to a labyrinth-type lower sealing device for a coal mill base. Background Art

[0002] With the continuous development of industry, efficient and reliable equipment plays a vital role in all walks of life. Among them, the coal mill, as a key equipment in the coal industry, has a direct impact on the efficiency and product quality of the entire production system due to the stability of its operating state. The coal mill base is an important component of the coal mill, and the quality of its sealing performance directly determines the operating reliability of the entire machine.

[0003] In the prior art, when the coal mill is in use, the friction force generated by the contact between the transmission disc and the lower sealing structure is large, resulting in deeper grooves. In addition, due to the single structure and poor functionality of the sealing device, the sealing device will wear faster during long-term use, seriously affecting the service life of the sealing device and increasing its maintenance and replacement costs. Utility Model Content

[0004] The purpose of the utility model is to solve the problem that when the above equipment is in use, the friction between the transmission disc and the sealing device is large, resulting in serious damage to the sealing device during long-term use, thereby proposing a labyrinth lower sealing device for a coal mill base.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a labyrinth lower sealing device for a coal mill base, comprising a coal mill lower frame, a mounting plate is arranged on one side of the outer wall of the coal mill lower frame, a sealing shell is fixedly inserted into the inner surface wall of the mounting plate, a plurality of concave grooves are provided on the inner surface wall of the sealing shell, flexible sealing strips are fixedly installed on the inner surface walls of the plurality of concave grooves, a plurality of annular grooves are provided on the inner surface walls of the plurality of annular grooves, floating sealing rings are arranged on the inner surface walls of the plurality of annular grooves.

[0006] Preferably, the sealing shell, flexible sealing strip and floating sealing ring are all composed of a first wear-resistant layer, a high-temperature resistant layer, an elastic layer, an absorption layer, a support layer and a second wear-resistant layer. The inner surface wall of the first wear-resistant layer is provided with a high-temperature resistant layer, the inner surface wall of the high-temperature resistant layer is provided with an elastic layer, the inner surface wall of the elastic layer is provided with an absorption layer, the inner surface wall of the absorption layer is provided with a support layer, and the inner surface wall of the support layer is provided with a second wear-resistant layer.

[0007] Preferably, the first wear-resistant layer and the second wear-resistant layer are made of polytetrafluoroethylene fiber, and the thickness of the first wear-resistant layer and the second wear-resistant layer is approximately between 8-17 mm, the high temperature resistant layer is made of fluororubber, and the thickness of the high temperature resistant layer is approximately between 2-12 mm, the elastic layer is made of nitrile rubber, and the thickness of the elastic layer is approximately between 8-15 mm, the absorption layer is made of fluororubber, and the thickness of the absorption layer is approximately between 4-15 mm, and the support layer is made of polyester fiber, and the thickness of the support layer is approximately between 8-18 mm.

[0008] Preferably, a transmission device body is fixedly installed on one side of the outer wall of the lower frame of the coal mill, a transmission shaft is provided on one side of the outer wall of the transmission device body, an insertion groove is opened on the outer wall of the lower frame of the coal mill, and the inner wall of the transmission shaft is movably inserted in the insertion groove.

[0009] Preferably, the outer wall of the transmission shaft is provided with a plurality of circular grooves, the inner wall of the mounting plate is movably provided with four first bolts, and one side of the outer wall of the lower frame of the coal mill is fixedly connected with one side of the outer wall of the mounting plate by the first bolts.

[0010] Preferably, the outer wall of the sealing shell is provided with four thread grooves, the inner walls of the four thread grooves are movably inserted with second bolts, and the outer wall of the sealing shell is fixedly connected by the second bolts.

[0011] Preferably, the outer surfaces of the plurality of floating sealing rings are each provided with a group of mounting grooves, the inner surfaces of the plurality of groups of mounting grooves are each fixedly connected with one end of a connecting spring, and the other end of the connecting spring is fixedly connected to the inner surface wall of the circular groove.

[0012] Compared with the prior art, the advantages and positive effects of the utility model are:

[0013] 1. During use, the first wear-resistant layer and the second wear-resistant layer can reduce friction, reduce surface wear, and extend the service life of the seal through the interaction of a series of components. The high-temperature resistant layer can maintain good elasticity and shape stability at high temperatures to ensure that the sealing effect is not affected. The elastic layer can maintain the elasticity and resilience of the structure to ensure that the sealing gap can be correctly filled after installation and provide lasting sealing performance. The absorption layer can absorb part of the energy when subjected to external impact or vibration, reduce damage to the seal, and extend its service life. The support layer can enhance the structural strength and stability of the seal, prevent deformation or rupture during the sealing operation, and ensure that the seal can effectively play a sealing role during use. The above structure can extend the service life of the sealing device and greatly reduce the cost of maintenance and replacement.

[0014] 2. In use, the utility model, through the interaction of a series of components, when the sealing device is in use, utilizes the tiny gap composed of the flexible sealing strip, the floating sealing ring, the concave groove and the annular groove to produce a throttling effect when the fluid passes through the gap, thereby reducing the pressure and increasing the speed, and converting the speed energy into pressure energy in the space formed by the flexible sealing strip and the floating sealing ring, thereby reducing the pressure difference on both sides of the gap, achieving the purpose of sealing, and greatly improving the practicality of the sealing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a main structural stereogram of the labyrinth lower sealing device of the coal mill base proposed by the utility model;

[0016] Figure 2 The main structural split diagram of the labyrinth lower sealing device of the coal mill base proposed by the utility model;

[0017] Figure 3 This is a disassembled diagram of the main structure of the labyrinth lower sealing device of the coal mill base proposed by the utility model;

[0018] Figure 4 This is a main structural cross-sectional view of the labyrinth lower sealing device of the coal mill base proposed by the utility model;

[0019] Figure 5 The utility model provides a partial structural layered diagram of the labyrinth lower sealing device of the coal mill base.

[0020] Legend:

[0021] 1. Coal mill lower frame; 2. Transmission device body; 3. Transmission shaft; 4. Circular groove; 5. Insertion groove; 6. Mounting plate; 7. First bolt; 8. Sealing shell; 9. Threaded groove; 10. Second bolt; 11. Concave groove; 12. Flexible sealing strip; 13. Annular groove; 14. Floating sealing ring; 15. Mounting groove; 16. Connecting spring; 17. First wear-resistant layer; 18. High temperature resistant layer; 19. Elastic layer; 20. Absorption layer; 21. Support layer; 22. Second wear-resistant layer. DETAILED DESCRIPTION

[0022] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0023] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways than those described herein. Therefore, the present invention is not limited to the specific embodiments of the following disclosure.

[0024] Example 1: Figure 1-Figure 5 As shown, the utility model provides a labyrinth lower sealing device for a coal mill base, comprising a coal mill lower frame 1, a mounting plate 6 is arranged on one side of the outer wall of the coal mill lower frame 1, a sealing shell 8 is fixedly inserted on the inner surface wall of the mounting plate 6, a plurality of concave grooves 11 are provided on the inner surface wall of the sealing shell 8, a flexible sealing strip 12 is fixedly installed on the inner surface wall of the plurality of concave grooves 11, a plurality of annular grooves 13 are provided on the inner surface wall of the plurality of annular grooves 13, a floating sealing ring 14 is arranged on the inner surface wall of the plurality of annular grooves 13, the sealing shell 8, the flexible sealing strip 12 and the floating sealing ring 14 are all composed of a first wear-resistant layer 17, a high-temperature resistant layer 18, an elastic layer 19, an absorption layer 20, a support layer 21 and a second wear-resistant layer 22, the inner surface wall of the first wear-resistant layer 17 is provided with a high-temperature resistant layer 18, and the inner surface wall of the high-temperature resistant layer 18 is provided with There is an elastic layer 19, the inner surface wall of the elastic layer 19 is provided with an absorption layer 20, the inner surface wall of the absorption layer 20 is provided with a support layer 21, the inner surface wall of the support layer 21 is provided with a second wear-resistant layer 22, the first wear-resistant layer 17 and the second wear-resistant layer 22 are made of polytetrafluoroethylene fiber, and the thickness of the first wear-resistant layer 17 and the second wear-resistant layer 22 is approximately between 8-17mm, the high temperature resistant layer 18 is made of fluororubber, and the thickness of the high temperature resistant layer 18 is approximately between 2-12mm, the elastic layer 19 is made of nitrile rubber, and the thickness of the elastic layer 19 is approximately between 8-15mm, the absorption layer 20 is made of fluororubber, and the thickness of the absorption layer 20 is approximately between 4-15mm, and the support layer 21 is made of polyester fiber, and the thickness of the support layer 21 is approximately between 8-18mm.

[0025] The effects achieved by the entire embodiment 1 are as follows: the first wear-resistant layer 17 and the second wear-resistant layer 22 can reduce friction, reduce surface wear, and extend the service life of the seal; the high temperature resistant layer 18 can maintain good elasticity and shape stability at high temperatures to ensure that the sealing effect is not affected; the elastic layer 19 can maintain the elasticity and resilience of the structure to ensure that the sealing gap can be correctly filled after installation and provide long-lasting sealing performance; the absorption layer 20 can absorb part of the energy when subjected to external impact or vibration to reduce damage to the seal and extend its service life; the support layer 21 can enhance the structural strength and stability of the seal to prevent deformation or rupture during sealing operation and ensure that the seal can effectively perform a sealing function during use; the above structure can extend the service life of the sealing device and greatly reduce the cost of maintenance and replacement.

[0026] Example 2: Figure 2-Figure 5As shown, a transmission device body 2 is fixedly installed on one side of the outer wall of the lower frame 1 of the coal mill, and a transmission shaft 3 is arranged on one side of the outer wall of the transmission device body 2. An insertion groove 5 is opened on the outer wall of the lower frame 1 of the coal mill, and the inner wall of the transmission shaft 3 is movably inserted in the insertion groove 5. A plurality of circular grooves 4 are opened on the outer wall of the transmission shaft 3, and four first bolts 7 are movably inserted on the inner wall of the mounting plate 6, and one side of the outer wall of the lower frame 1 of the coal mill is fixedly connected with one side of the outer wall of the mounting plate 6 by the first bolts 7. Four threaded grooves 9 are opened on the outer wall of the sealing shell 8, and the inner walls of the four threaded grooves 9 are movably inserted with second bolts 10, and the outer wall of the sealing shell 8 is fixedly connected by the second bolts 10. A group of mounting grooves 15 are opened on the outer walls of the plurality of floating sealing rings 14, and the inner walls of the plurality of groups of mounting grooves 15 are fixedly connected with one end of a connecting spring 16, and the other end of the connecting spring 16 is fixedly connected to the inner wall of the circular groove 4.

[0027] The effect achieved by the entire embodiment 2 is that when the sealing device is in use, the tiny gap formed by the flexible sealing strip 12, the floating sealing ring 14, the concave groove 11 and the annular groove 13 is used to produce a throttling effect when the fluid passes through the gap, thereby reducing the pressure and increasing the speed, and converting the speed energy into pressure energy in the space formed by the flexible sealing strip 12 and the floating sealing ring 14, thereby reducing the pressure difference on both sides of the gap to achieve the purpose of sealing, greatly improving the practicality of the sealing device, and when the parts inside the sealing device are damaged, the sealing device can be quickly disassembled under the action of the first bolt 7 and the second bolt 10, so that the internal parts with severe wear can be repaired or replaced, greatly improving the efficiency of repair and replacement.

[0028] Working principle: When the labyrinth lower sealing device of the coal mill base is in use, the tiny gap formed by the flexible sealing strip 12, the floating sealing ring 14, the concave groove 11 and the annular groove 13 is used to make the fluid produce a throttling effect when passing through the gap, thereby reducing the pressure and increasing the speed, and converting the speed energy into pressure energy in the space formed by the flexible sealing strip 12 and the floating sealing ring 14, thereby reducing the pressure difference on both sides of the gap to achieve the purpose of sealing. When the sealing wind passes through the gap of the labyrinth sealing device, the air flow speed is accelerated, the pressure and temperature are reduced, and a vortex is formed after entering the cavity between the teeth. The air flow speed is almost zero, and the kinetic energy is converted into heat energy, thereby keeping the gas temperature basically unchanged but the pressure is reduced. Through multiple such gaps and cavities, the sealing wind is gradually blocked, reducing leakage and avoiding further damage to the sealing device, and the sealing shell 8, the flexible sealing strip 12 and the floating sealing ring 14 have an outer layer to an inner layer, the first wear-resistant layer 1 7-high temperature resistant layer 18-elastic layer 19-absorption layer 20-support layer 21-second wear-resistant layer 22, the first wear-resistant layer 17 and the second wear-resistant layer 22 are made of polytetrafluoroethylene fiber, which can reduce friction, reduce surface wear and extend the service life of the seal. The high temperature resistant layer 18 is made of fluororubber, which can maintain good elasticity and shape stability at high temperatures to ensure that the sealing effect is not affected. The elastic layer 19 is made of nitrile rubber, which can maintain the elasticity and resilience of the structure to ensure that the sealing gap can be correctly filled after installation and provide long-lasting sealing performance. The absorption layer 20 is made of fluororubber, which can absorb part of the energy when subjected to external impact or vibration, reduce damage to the seal and extend its service life. The support layer 21 is made of polyester fiber, which can enhance the structural strength and stability of the seal, prevent deformation or rupture during sealing operation, and ensure that the seal can effectively play a sealing role during use.

[0029] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. The labyrinth lower sealing device of coal mill base is characterized by: The invention comprises a coal mill lower frame (1), wherein a mounting plate (6) is arranged on one side of the outer wall of the coal mill lower frame (1), a sealing shell (8) is fixedly inserted into the inner surface wall of the mounting plate (6), a plurality of concave grooves (11) are provided on the inner surface wall of the sealing shell (8), a flexible sealing strip (12) is fixedly installed on the inner surface walls of the plurality of concave grooves (11), a plurality of annular grooves (13) are provided on the inner surface walls of the plurality of annular grooves (13), and a floating sealing ring (14) is provided on the inner surface walls of the plurality of annular grooves (13).

2. The labyrinth lower sealing device for coal mill base according to claim 1, characterized in that: The sealing shell (8), the flexible sealing strip (12) and the floating sealing ring (14) are all composed of a first wear-resistant layer (17), a high-temperature resistant layer (18), an elastic layer (19), an absorption layer (20), a support layer (21) and a second wear-resistant layer (22); the inner surface wall of the first wear-resistant layer (17) is provided with a high-temperature resistant layer (18), the inner surface wall of the high-temperature resistant layer (18) is provided with an elastic layer (19), the inner surface wall of the elastic layer (19) is provided with an absorption layer (20), the inner surface wall of the absorption layer (20) is provided with a support layer (21), and the inner surface wall of the support layer (21) is provided with a second wear-resistant layer (22).

3. The labyrinth lower sealing device for coal mill base according to claim 2 is characterized in that: The first wear-resistant layer (17) and the second wear-resistant layer (22) are made of polytetrafluoroethylene fiber, and the thickness of the first wear-resistant layer (17) and the second wear-resistant layer (22) is approximately between 8 and 17 mm. The high-temperature resistant layer (18) is made of fluororubber, and the thickness of the high-temperature resistant layer (18) is approximately between 2 and 12 mm. The elastic layer (19) is made of nitrile rubber, and the thickness of the elastic layer (19) is approximately between 8 and 15 mm. The absorption layer (20) is made of fluororubber, and the thickness of the absorption layer (20) is approximately between 4 and 15 mm. The support layer (21) is made of polyester fiber, and the thickness of the support layer (21) is approximately between 8 and 18 mm.

4. The labyrinth lower sealing device for coal mill base according to claim 3 is characterized in that: A transmission device body (2) is fixedly mounted on one side of the outer wall of the coal mill lower frame (1), a transmission shaft (3) is arranged on one side of the outer wall of the transmission device body (2), an insertion groove (5) is provided on the outer wall of the coal mill lower frame (1), and the inner wall of the transmission shaft (3) is movably inserted into the insertion groove (5).

5. The labyrinth lower sealing device for coal mill base according to claim 4, characterized in that: The outer wall of the transmission shaft (3) is provided with a plurality of circular grooves (4), the inner wall of the mounting plate (6) is provided with four first bolts (7) movably inserted therein, and one side of the outer wall of the coal mill lower frame (1) is fixedly connected to one side of the outer wall of the mounting plate (6) via the first bolts (7).

6. The labyrinth lower sealing device for coal mill base according to claim 5, characterized in that: The outer wall of the sealing shell (8) is provided with four threaded grooves (9), the inner walls of the four threaded grooves (9) are all movably inserted with second bolts (10), and the outer wall of the sealing shell (8) is fixedly connected by the second bolts (10).

7. The labyrinth lower sealing device for coal mill base according to claim 6, characterized in that: The outer surfaces of the plurality of floating sealing rings (14) are each provided with a group of mounting grooves (15), the inner surfaces of the plurality of groups of mounting grooves (15) are each fixedly connected to one end of a connecting spring (16), and the other end of the connecting spring (16) is fixedly connected to the inner surface wall of the circular groove (4).

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