Coal gas fan axial seal device

Abstract

The utility model provides a kind of coal gas fan axial sealing device including mounting sleeve, the one end of mounting sleeve is detachably installed with connecting end cover by bolt, the other end of mounting sleeve is detachably installed with sealing end cover by bolt, the middle part of connecting end cover is rotatably provided with rotating ring, the middle part of sealing end cover is rotatably provided with rotating cylinder, the middle part of mounting sleeve is rotatably provided with fan shaft, rotating ring and rotating cylinder are connected and fixed between fan shaft by positioning bolt. Through the coal gas fan axial sealing device described in the utility model, through the unique soft and hard limit and self-adaptive pressure regulation, the tiny displacement generated by thermal expansion or vibration of fan shaft can be effectively absorbed, dynamic compensation is realized, reliability is significantly improved, then cleverly layout in axial and radial space, complex labyrinth type sealing barrier is formed, further prevent harmful medium from permeating outward, ensure absolute sealing safety in harsh application of coal gas fan.

Description

Technical Field

[0001] This utility model belongs to the field of gas fan sealing technology, and specifically relates to an axial sealing device for a gas fan. Background Technology

[0002] Gas blowers (especially in industries such as coking, coal chemical, and metallurgy) typically transport high-temperature, toxic, and explosive coal gas containing tar, dust, and water vapor. Therefore, the reliability and safety of their shaft end seals are of paramount importance. An axial seal, as the name suggests, is a device that prevents gas leakage along the blower's axial direction.

[0003] Existing axial sealing devices for gas blowers work by filling the sealing gland with soft packing (such as packing) and applying axial pressure through the gland, causing the packing to expand radially and fit tightly against the shaft surface to form a sealing layer. This layer consists of a pair of dynamic and static rings perpendicular to the axis. Under the action of fluid pressure and spring force, the end faces of these two precision rings fit tightly together and rotate relative to each other, forming a barrier to prevent leakage. However, in actual use, the slight displacement of the blower shaft due to thermal expansion or vibration may cause the sealing force to be too tight, leading to wear, or too loose, causing leakage. This results in a small amount of harmful media seeping out during the processing and production process. Utility Model Content

[0004] In view of this, this utility model addresses the shortcomings of existing technologies by providing an axial sealing device for gas blowers. Through unique soft and hard limiting and adaptive pressure adjustment, it can effectively absorb the minute displacement of the blower shaft caused by thermal expansion or vibration, achieving dynamic compensation and significantly improving reliability. Then, it is cleverly arranged in the axial and radial space to form a complex labyrinth-type sealing barrier, which can further prevent harmful media from penetrating outward and ensure absolute sealing safety in harsh applications such as gas blowers.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an axial sealing device for a gas blower, including an installation sleeve, a connecting end cover detachably installed at one end of the installation sleeve by bolts, a sealing end cover detachably installed at the other end of the installation sleeve by bolts, a rotating ring rotatably disposed in the middle of the connecting end cover, a rotating cylinder rotatably disposed in the middle of the sealing end cover, a blower shaft rotatably disposed in the middle of the installation sleeve, the rotating ring and the rotating cylinder are both connected and fixed to the blower shaft by positioning bolts, and a sealing mechanism for sealing the blower shaft is provided between the connecting end cover and the sealing end cover and the blower shaft; The sealing mechanism includes a graphite soft ring disposed between the connecting end cover and the rotating ring, an elastic rotating ring sleeve rotatably disposed between the graphite soft ring and the rotating cylinder, the inner arc surface of the elastic rotating ring sleeve contacting the outer arc surface of the fan shaft, a silicon carbide hard sealing ring fixedly disposed inside the mounting sleeve near the connecting end cover, an auxiliary sealing element fixedly disposed between the silicon carbide hard sealing ring and the elastic rotating ring sleeve, a closing ring fixedly disposed on the mounting sleeve near the sealing end cover, the inner arc surface of the closing ring contacting the elastic rotating ring sleeve; a graphite ring fixedly disposed in a clearance groove opened inside the mounting sleeve near the connecting end cover, an alumina ceramic ring fixedly disposed between the graphite ring and the silicon carbide hard sealing ring.

[0006] As a further improvement of this utility model, a packing seal is fixedly installed inside the sealing end cover, and the inner arc surface of the packing seal contacts the elastic moving ring bushing; two lip seals are fixedly installed inside the mounting sleeve on the side near the sealing end cover, and an O-ring is fixedly installed inside each of the two lip seals, which are located between the packing seal and the closing ring; an annular air bladder is fixedly installed in the middle of the mounting sleeve, and the interior of the annular air bladder contacts the elastic moving ring bushing; an air tube is installed between the mounting sleeve and the annular air bladder, and a cap is installed at the end of the air tube.

[0007] As a further improvement of this utility model, rubber sealing oil is provided between the graphite soft ring, the silicon carbide hard sealing ring, the auxiliary sealing element, the annular airbag, the closing ring and the lip sealing ring and the elastic moving ring bushing.

[0008] As a further improvement of this utility model, both the connecting end cover and the sealing end cover are provided with mounting grooves. High-strength fiber reinforced material is fixedly arranged inside the mounting grooves. A pressure-bearing skeleton is fixedly arranged on the side of the high-strength fiber reinforced material near the transverse center of the fan shaft. An annular metal insert is fixedly arranged in the middle of the high-strength fiber reinforced material. High-elasticity soft ring material is arranged in the annular groove on the pressure-bearing skeleton.

[0009] Compared with the prior art, the beneficial effects of this utility model are as follows: Firstly, the rigid sealing rings and alumina ceramic rings provide stable rigid limiting, ensuring the stability of the sealing base under high-speed operation. At the same time, the annular airbag and lip seal achieve unique soft limiting and adaptive pressure regulation. Specifically, the external air pump can inflate the annular airbag, allowing its pressure to be precisely adjusted according to the actual working conditions, thereby avoiding wear caused by excessive sealing force or leakage caused by excessive looseness. The lip seal, combined with the elastic internal pressure provided by the O-ring, works in conjunction with the airbag to effectively absorb the small displacement of the fan shaft caused by thermal expansion or vibration, achieving dynamic compensation and significantly improving reliability.

[0010] Secondly, a multi-layered sealing system was constructed, consisting of silicon carbide hard sealing rings, graphite rings, auxiliary seals, lip seals, and other components. These components are cleverly arranged in the axial and radial spaces to form a complex labyrinthine sealing barrier. Every time a harmful medium (such as coal gas) attempts to pass through a sealing gap, it will experience a throttling effect, and its pressure and flow rate will be gradually reduced, thereby greatly reducing the overall leakage. At the same time, the introduction of inert sealing gas (such as nitrogen) was also considered, which can further prevent harmful media from penetrating outward and ensure absolute sealing safety in harsh applications such as coal gas blowers.

[0011] Thirdly, in terms of material selection, considering the stringent requirements of the working environment of the gas blower (which may contain corrosive components and experience vibration), key friction pair components, such as the moving ring bushing, which are in direct contact with the shaft, require materials with good wear resistance and a certain degree of elasticity. These components integrate multiple high-performance materials, leveraging their respective advantages: silicon carbide ceramic rings have high hardness, excellent wear resistance, and corrosion resistance, with a low coefficient of friction; graphite materials (graphite rings, graphite soft rings) provide excellent self-lubricating properties, forming a lubricating film between the friction pairs to reduce wear and energy consumption; auxiliary seals (such as O-rings, lip seals) typically use corrosion-resistant elastic materials (such as fluororubber). The synergistic work of these materials, supplemented by highly lubricating rubber sealing oil, ensures the long-term reliable operation of the sealing device in the corrosive environment of gas, while maintaining low frictional resistance and energy consumption.

[0012] Fourth, to ensure the overall structural rigidity and durability of the sealing assembly, high-strength fiber-reinforced materials, a pressure-bearing skeleton, and annular metal inserts are embedded inside the connecting end cap and the sealing end cap. This greatly improves the mechanical strength and pressure-bearing capacity of the end cap. This structural design can effectively resist the high pressure that may exist in the gas medium and prevent the end cap from deforming during long-term operation. This ensures the accuracy and stability of the relative positions of all sealing elements connected to it, providing a solid foundation for the long-term effectiveness of the labyrinth seal barrier. In addition, the labyrinth seal structure itself has the characteristics of being non-contact and wear-free, with almost no loss during normal operation, which makes its service life very long and the maintenance cycle relatively long. Attached Figure Description

[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0014] Figure 1 This is a schematic diagram of the axial sealing device for a gas blower according to this utility model; Figure 2 This is a schematic diagram of the planar structure of the axial sealing device for a gas blower according to this utility model; Figure 3This is an enlarged structural diagram of point A of the axial sealing device for a gas blower of this utility model; Figure 4 This is an enlarged structural diagram of section B of the axial sealing device for a gas blower of this utility model; Figure 5 This is an enlarged structural diagram of point C of the axial sealing device for the gas blower of this utility model.

[0015] In the diagram: 101, mounting sleeve; 102, connecting end cap; 103, sealing end cap; 104, rotating ring; 105, rotating cylinder; 106, fan shaft; 107, rubber sealing ring; 201, silicon carbide hard sealing ring; 202, graphite ring; 203, alumina ceramic ring; 204, auxiliary seal; 205, rubber sealing oil; 206, graphite soft ring; 207, elastic moving ring bushing; 208, annular airbag; 209, air tube; 210, sealing ring; 211, packing seal; 212, lip seal; 213, O-ring; 301, mounting groove; 302, high-strength fiber reinforced material; 303, annular metal insert; 304, pressure-bearing skeleton; 305, high-elasticity soft ring material. Detailed Implementation

[0016] To better understand this utility model, the following embodiments further illustrate its content, but the scope of protection of this utility model is not limited to the embodiments described below. Numerous specific details are set forth in the following description to provide a more thorough understanding of this utility model. However, it will be apparent to those skilled in the art that this utility model can be practiced without one or more of these details.

[0017] like Figure 1 , 2 As shown, the device includes an installation sleeve 101. One end of the installation sleeve 101 is detachably fitted with a connecting end cover 102 by bolts, and the other end of the installation sleeve 101 is detachably fitted with a sealing end cover 103 by bolts. A rotating ring 104 is rotatably mounted in the middle of the connecting end cover 102, and a rotating cylinder 105 is rotatably mounted in the middle of the sealing end cover 103. A fan shaft 106 is rotatably mounted in the middle of the installation sleeve 101. The rotating ring 104 and the rotating cylinder 105 are both connected and fixed to the fan shaft 106 by positioning bolts. A sealing mechanism for sealing the fan shaft 106 is provided between the connecting end cover 102 and the sealing end cover 103 and the fan shaft 106. The sealing mechanism includes a graphite soft ring 206 disposed between the connecting end cover 102 and the rotating ring 104. An elastic rotating ring sleeve 207 is rotatably disposed between the graphite soft ring 206 and the rotating cylinder 105. The inner arc surface of the elastic rotating ring sleeve 207 contacts the outer arc surface of the fan shaft 106. A silicon carbide hard sealing ring 201 is fixedly disposed inside the mounting sleeve 101 near the connecting end cover 102. An auxiliary sealing element 204 is fixedly disposed between the silicon carbide hard sealing ring 201 and the elastic rotating ring sleeve 207. A closing ring 210 is fixedly disposed on the side of the mounting sleeve 101 near the sealing end cover 103. The inner arc surface of the closing ring 210 contacts the elastic rotating ring sleeve 207. A graphite ring 202 is fixedly disposed in a clearance groove opened inside the mounting sleeve 101 near the connecting end cover 102. An alumina ceramic ring 203 is fixedly disposed between the graphite ring 202 and the silicon carbide hard sealing ring 201.

[0018] like Figure 2 , 3 As shown in Figure 4, a packing seal 211 is fixedly installed inside the sealing end cover 103, and the inner arc surface of the packing seal 211 contacts the elastic moving ring bushing 207; two lip seals 212 are fixedly installed inside the mounting sleeve 101 near the sealing end cover 103, and an O-ring 213 is fixedly installed inside each of the two lip seals 212. The two lip seals 212 are located between the packing seal 211 and the closing ring 210; the mounting sleeve 101... An annular airbag 208 is fixedly installed in the center of the interior. The interior of the annular airbag 208 is in contact with the elastic moving ring bushing 207. An air tube 209 is provided between the mounting sleeve 101 and the annular airbag 208. A cap is provided at the end of the air tube 209. Rubber sealing oil 205 is provided between the graphite soft ring 206, the silicon carbide hard sealing ring 201, the auxiliary sealing element 204, the annular airbag 208, the closing ring 210, and the lip sealing ring 212 and the elastic moving ring bushing 207.

[0019] like Figure 5 As shown, both the connecting end cap 102 and the sealing end cap 103 have an installation groove 301 inside. A high-strength fiber reinforced material 302 is fixedly installed inside the installation groove 301. A pressure-bearing skeleton 304 is fixedly installed on the side of the high-strength fiber reinforced material 302 near the transverse center of the fan shaft 106. An annular metal insert 303 is fixedly installed in the middle of the high-strength fiber reinforced material 302. A high-elasticity soft ring material 305 is installed in the annular groove on the pressure-bearing skeleton 304.

[0020] During use, the mounting sleeve 101 and the connecting end cap 102 can be detachably installed between the mounting sleeve 101 and the mounting sleeve 101 by tightening the bolts with external tools, so as to facilitate the disassembly, inspection and replacement of the seals. During daily use, the fan shaft 106 is driven to rotate by an external motor. During this rotation, the elastic moving ring sleeve 207 directly contacts the fan shaft 106, providing dynamic contact. The elasticity of the material in the sleeve compensates for thermal expansion or vibration of the shaft, reducing wear and noise. Simultaneously, the graphite ring 202 and alumina ceramic ring 203 provide support for the silicon carbide hard seal ring 201, thus protecting the silicon carbide hard seal ring 201. The position is rigidly limited, so that the silicon carbide rigid sealing ring 201 rigidly limits the position of the elastic moving ring sleeve 207 through the auxiliary sealing element 204. The closing ring 210 provides a supporting effect for the elastic moving ring sleeve 207 and rigidly limits the position of the elastic moving ring sleeve 207. The position of the elastic moving ring sleeve 207 is rigidly limited by the cooperation of the graphite ring 202, the alumina ceramic ring 203, the auxiliary sealing element 204 and the closing ring 210, thus avoiding the appearance of gaps between the elastic moving ring sleeve 207 and the fan shaft 106. An external air pump inflates the air pipe 209, which in turn inflates the annular air bladder 208. This allows the internal pressure of the annular air bladder 208 to be adjusted via the air pipe 209, enabling the sealing force to adapt to changes in operating conditions and preventing leakage or wear caused by excessive tightness or looseness. After adjusting the internal pressure of the annular air bladder 208, the cap is screwed down to close the air pipe 209, causing the annular air bladder 208 to softly limit the elastic moving ring sleeve 207. This is achieved through the lip seal 212 and each lip seal... The O-ring 213 in the middle of 212 cooperates with each lip seal 212 to apply an internal pressure to the elastic ring sleeve 207 through its elastic properties, providing soft pressure to the elastic ring sleeve 207. Then, through the cooperation between the elastic ring sleeve 207 and the annular air bag 208, the position of the elastic ring sleeve 207 is softly limited, avoiding gaps between the elastic ring sleeve 207 and the fan shaft 106, while absorbing the thermal expansion or vibration of the elastic ring sleeve 207 during the rotation of the fan shaft 106. In addition, a rubber sealing oil 205 is provided between the graphite soft ring 206, the silicon carbide hard sealing ring 201, the auxiliary sealing element 204, the annular airbag 208, the closing ring 210, and the lip sealing ring 212 and the elastic moving ring bushing 207 to further provide a seal while reducing frictional resistance, effectively sealing grease and lubricating oil, and ensuring the sealing performance between the fan shaft 106 and the elastic moving ring bushing 207 that contacts the fan shaft 106; The combination of multiple sealing components, including silicon carbide hard sealing ring 201, graphite ring 202, alumina ceramic ring 203, auxiliary seal 204, rubber sealing oil 205, graphite soft ring 206, elastic moving ring bushing 207, annular airbag 208, sealing ring 210, packing seal 211, lip seal 212, and O-ring 213, forms a composite labyrinth-type sealing barrier in both the axial and radial directions. This creates a throttling effect as the gas passes through each gap, gradually reducing pressure and volume, thus greatly minimizing leakage. In gas blowers, inert gas (such as nitrogen) or clean buffer gas is usually introduced into the labyrinth seal to form a gas seal, ensuring that the gas will not leak out at all. The silicon carbide hard sealing ring 201, the alumina ceramic ring 203 and the sealing ring 210 have high hardness, while the graphite ring 202 and the graphite soft ring 206 provide self-lubricating properties; the rubber sealing oil 205 enhances lubrication and ensures the long-term reliability of the sealing device in the corrosive environment of coal gas. High-strength fiber-reinforced material 302, pressure-bearing skeleton 304, and annular metal insert 303 are provided inside the connecting end cap 102 and sealing end cap 103, which improves the mechanical strength and pressure-bearing capacity of the connecting end cap 102 and sealing end cap 103. High-strength fiber-reinforced material 302 is fixedly installed inside the mounting groove 301, which is combined with the pressure-bearing skeleton 304 to disperse axial stress. Under high-pressure gas environment, the structure is not easily deformed, ensuring the long-term integrity of the seal.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Any other modifications or equivalent substitutions made by those skilled in the art to the technical solution of this utility model, as long as they do not depart from the spirit and scope of the technical solution of this utility model, should be covered within the scope of the claims of this utility model.

Claims

1. An axial sealing device for a gas blower, comprising a mounting sleeve (101), characterized in that: One end of the mounting sleeve (101) is detachably mounted with a connecting end cap (102) by bolts, and the other end of the mounting sleeve (101) is detachably mounted with a sealing end cap (103) by bolts. A rotating ring (104) is rotatably provided in the middle of the connecting end cap (102), a rotating cylinder (105) is rotatably provided in the middle of the sealing end cap (103), and a fan shaft (106) is rotatably provided in the middle of the mounting sleeve (101). The rotating ring (104) and the rotating cylinder (105) are both connected and fixed to the fan shaft (106) by positioning bolts. A sealing mechanism for sealing the fan shaft (106) is provided between the connecting end cap (102) and the sealing end cap (103) and the fan shaft (106). The sealing mechanism includes a graphite soft ring (206) disposed between the connecting end cover (102) and the rotating ring (104), an elastic moving ring bushing (207) rotatably disposed between the graphite soft ring (206) and the rotating cylinder (105), the inner arc surface of the elastic moving ring bushing (207) contacting the outer arc surface of the fan shaft (106), a silicon carbide hard sealing ring (201) fixedly disposed inside the mounting sleeve (101) near the connecting end cover (102), an auxiliary sealing element (204) fixedly disposed between the silicon carbide hard sealing ring (201) and the elastic moving ring bushing (207), and a closing ring (210) fixedly disposed on the side of the mounting sleeve (101) near the sealing end cover (103), the inner arc surface of the closing ring (210) contacting the elastic moving ring bushing (207).

2. The axial (106) sealing device for a gas blower as described in claim 1, characterized in that: A graphite ring (202) is fixedly installed in the clearance groove opened inside the mounting sleeve (101) on the side near the connecting end cover (102), and an alumina ceramic ring (203) is fixedly installed between the graphite ring (202) and the silicon carbide hard sealing ring (201).

3. The axial (106) sealing device for a gas blower as described in claim 1, characterized in that: The sealing end cap (103) is internally fixed with a packing seal (211), and the inner arc surface of the packing seal (211) is in contact with the elastic moving ring bushing (207).

4. The axial (106) sealing device for a gas blower as described in claim 3, characterized in that: Two lip seals (212) are fixedly installed inside the mounting sleeve (101) on the side near the sealing end cap (103). An O-ring (213) is fixedly installed inside each of the two lip seals (212). The two lip seals (212) are located between the packing seal (211) and the closing ring (210).

5. The axial (106) sealing device for a gas blower as described in claim 4, characterized in that: An annular airbag (208) is fixedly installed in the center of the mounting sleeve (101). The interior of the annular airbag (208) is in contact with the elastic moving ring bushing (207). An air tube (209) is provided between the mounting sleeve (101) and the annular airbag (208). A cap is provided at the end of the air tube (209).

6. The axial (106) sealing device for a gas blower as described in claim 5, characterized in that: Rubber sealing oil (205) is provided between the graphite soft ring (206), silicon carbide hard sealing ring (201), auxiliary seal (204), annular airbag (208), closing ring (210) and lip seal (212) and the elastic moving ring bushing (207).

7. The axial (106) sealing device for a gas blower as described in claim 1, characterized in that: The connecting end cap (102) and the sealing end cap (103) are both provided with mounting grooves (301). High-strength fiber reinforced material (302) is fixedly installed inside the mounting groove (301). A pressure-bearing skeleton (304) is fixedly installed on the side of the high-strength fiber reinforced material (302) near the transverse center of the fan shaft (106).

8. The axial (106) sealing device for a gas blower as described in claim 7, characterized in that: The high-strength fiber-reinforced material (302) has an annular metal insert (303) fixedly installed in the center of its interior, and the pressure-bearing skeleton (304) has an annular groove filled with a highly elastic soft ring material (305).

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