Bearing bush and sealing seat assembly of transmission shaft

Abstract

The utility model discloses a transmission shaft bearing bush and sealing seat assembly. A shaft seat fixing plate is arranged between a shaft seat and a shaft seat bracket; a self-lubricating bearing bush is arranged between the inner side of the end face of the shaft seat and the transmission shaft, and the inner diameter of the self-lubricating bearing bush is slightly larger than the outer diameter of the transmission shaft. The inner axial surface of the shaft seat is provided with an annular soft packing sealing cavity, and the outer axial surface of the shaft seat is provided with a soft packing injection port and a soft packing injection valve; a composite sealing body sleeved on the shaft is arranged on the outer end face of the shaft seat, and a two-half-shaped sealing shell sleeved on the shaft is covered outside the composite sealing body; a plurality of fastening bolt platforms are arranged at the positions, perpendicular to the kerfs, of the sealing shells, and the two sealing shells are fastened together through fastening bolts on the fastening bolt platforms. The device is convenient to disassemble and assemble; and the service life of the sealing body is prolonged, the maintenance cost is reduced, powder leakage, ash leakage and air leakage during shaft movement are completely eradicated, and pollution to the production environment is fundamentally improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing products, in particular to a seal for a hot air valve transmission shaft. Background Art

[0002] The primary air from a thermal power plant's boiler is pressurized by a fan and passed through an air preheater for heat exchange. The air is heated to approximately 350°C by the air preheater and then fed into the coal mill via a hot air duct. Because the air is mixed with ash from the boiler flue gas during the heat exchange process in the air preheater, this high-temperature, high-pressure primary air is fed into the coal mill via the hot air duct, heating the pulverized coal. Through the pipes and air pressure, the pulverized coal is transported to the boiler combustion chamber for combustion. Fluctuations in power generation require the adjustment of the duct valve and its corresponding mechanism to adapt to the changes and achieve power regulation. Existing duct control valves use bearings as their support and rotation mechanism, and the seal is achieved by graphite packing in the packing grooves. This has a short service life and requires frequent maintenance. Adjustment of the valve can cause leakage of powder, ash, and air. In some cases, ash can be ejected directly, seriously polluting the production environment and harming the health of workers. The leakage of the ash and hot air mixture can erode equipment components, causing damage and accompanied by heat loss. Frequent maintenance is required, impacting stable equipment operation. An air duct valve used in existing thermal power plants adopts a structure in which a rotary shaft seal is installed on the inside and a bearing seat is arranged on the outside. A bearing seat and a rotary shaft packing chamber flange seal are respectively used. Due to limited space, the rotary shaft packing chamber flange seal spare parts are difficult to replace; and the rotary shaft packing chamber flange seal is unreliable and easily causes leakage. Summary of the Invention

[0003] The purpose of the utility model is to solve the above problems and provide a transmission shaft bearing shell and sealing seat assembly with good sealing effect, long service life and simple and quick maintenance.

[0004] The technical solution of the present utility model is achieved as follows: a transmission shaft bearing and sealing seat assembly, characterized in that: it includes a shaft seat, a shaft seat bracket, and a transmission shaft, and a shaft seat fixing plate is provided between the shaft seat and the shaft seat bracket; a self-lubricating bearing sleeve is provided between the inner side of the shaft seat end face and the transmission shaft, and the inner diameter of the self-lubricating bearing sleeve is slightly larger than the outer diameter of the transmission shaft; an annular soft packing sealing cavity is provided on the inner shaft surface of the shaft seat, and a soft packing injection port and a soft packing injection valve are provided on the outer shaft surface of the shaft seat; a composite sealing body is provided on the outer end face of the shaft seat and is sleeved on the shaft, and the composite sealing body is covered with a two-petal half-shaped sealing shell sleeve sleeved on the shaft; a plurality of fastening bolt platforms are provided on the sealing shell perpendicular to the slit, and the fastening bolts fasten the two-petal sealing shells together at the fastening bolt platforms, and tighten the composite sealing body axially; a plurality of clamping bolts compress the sealing shell, the composite sealing body, and the shaft seat into one.

[0005] Furthermore, the sealing shell is cut along the axial direction, and the cut has a certain width.

[0006] Furthermore, the angle between the sealing shell slit and the axisymmetric line connecting the two fastening bolts is 45°.

[0007] Furthermore, the width of the slit of the sealing shell is 0.1 to 4 mm.

[0008] Furthermore, the sealed shell is composed of three petals.

[0009] Furthermore, the sealed cavity in the sealed housing is any one of T-shaped, C-shaped, U-shaped, conical, truncated cone, and V-shaped.

[0010] Furthermore, the composite sealing body is composed of a plurality of sealing elastomers.

[0011] Furthermore, the outer wall surface of the composite sealing body is a conical surface.

[0012] The utility model adopts a half-shaped sealing body shell and a composite sealing body made of elastomer, so that it is easy to disassemble and install; and a soft filler injection port and a soft filler sealing cavity are provided, integrating the sealing cavity and the shaft seat into one, thereby greatly improving the service life of the sealing body, greatly reducing maintenance costs, and improving the efficiency of the generator set; eliminating powder leakage, ash leakage and air leakage during shaft movement, and fundamentally improving the pollution of the production environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural diagram of the present utility model.

[0014] Figure 2 for Figure 1 A-direction view.

[0015] In the figure: 1. Shaft seat; 2. Shaft seat bracket; 3. Soft packing injection port; 4. Self-lubricating bearing sleeve; 5. Sealing shell; 6. Shaft seat fixing plate; 7. Composite sealing body; 8. Transmission shaft; 9. Ash and hot air mixing zone; 10. Fastening bolt platform; 11. Fastening bolt; 12. Outer wall of hot air duct; 13. Normal temperature and pressure zone; 14. Soft packing injection valve; 15. Soft packing annular chamber; 16. Holding bolt. DETAILED DESCRIPTION

[0016] from Figure 1 and Figure 2It can be seen that the utility model is provided with a shaft seat 1 at the outer wall surface 12 of the hot air duct, a shaft seat fixing plate 6 is provided between the shaft seat 1 and the shaft seat bracket 2, a soft packing annular chamber 15 is provided in the annular gap between the shaft seat 1 and the transmission shaft 8, and a soft packing injection port 3 and a soft packing injection valve 14 are provided on the outer wall of the shaft seat; a self-lubricating bearing sleeve 4 is provided between the inner side of the end face of the shaft seat 1 and the transmission shaft 8 to facilitate the weight and rotation of the shaft, and the inner diameter of the self-lubricating bearing sleeve 4 is slightly larger than the outer diameter of the shaft; a sleeve is provided on the outer end face of the self-lubricating bearing sleeve 4. The composite sealing body 7 on the transmission shaft 8 is covered with a sealing shell 5 which is cut into two halves in a half-shape and is mounted on the transmission shaft 8. The sealing cavity in the sealing shell 5 matches the outer axial surface of the composite sealing body 7. A plurality of fastening bolt platforms 10 are provided on the sealing shell 5 perpendicular to the slit. The fastening bolts 11 fasten the two halves of the sealing shell 5 together at the fastening bolt platforms, and tighten the composite sealing body 7 axially. A plurality of clamping bolts 16 compress the sealing shell 5, the composite sealing body 7, and the shaft seat 1 into one.

[0017] The positions of the sealing shell slit and the fastening bolts 11 must not overlap. The best state is that the angle between the sealing shell slit and the axisymmetric line connecting the two fastening bolts 11 is 45°.

[0018] The utility model adds an axle seat 1 to the outer wall 12 of the existing hot air duct. The axle seat 1 is first put on the transmission shaft 8 and fixed to the outer wall of the hot air duct by welding, bonding or fastening. In order to facilitate the fitting of the composite sealing body 7 with a notch and a T-shaped cross section, it is put on the transmission shaft 8 and tightly fits the self-lubricating bearing sleeve 4. The sealing shell 5 cut into two halves is put on the composite sealing body 7. The width of the sealing shell slit is 0.1 to 4 mm. The inner surface of the sealing shell 5 is tightly pressed against the outer surface of the composite sealing body 7. The sealing shell 5 is locked with four clamping bolts 16, and the force provided by the locking bolts 11 makes the composite sealing body 7 clamped to the transmission shaft 8, so as to achieve a reliable sealing effect. Even in the case of eccentricity or wear of the door shaft, it can achieve no dust leakage, no powder leakage, and no air leakage. The sealing effect is very good, no frequent maintenance is required, the working environment is improved, and energy consumption is reduced.

[0019] The sealing housing 5 of the present invention can also be composed of three petals, and the sealing cavity can be T-shaped, C-shaped, U-shaped, conical, truncated cone-shaped, or V-shaped. Multiple sealing elastomers can also be installed within the sealing housing cavity. The outer wall of the composite sealing body 7 can also be conical. The inner wall of the shaft seat is provided with a soft filler annular chamber 14 and a soft filler injection port 3, allowing the filler to freely fill the annular gap between the transmission shaft 8 and the shaft seat 1, effectively preventing leakage.

Claims

1. A transmission shaft bearing and sealing seat assembly, characterized in that: The invention comprises a shaft seat (1), a shaft seat bracket (2), and a transmission shaft (8); a shaft seat fixing plate (6) is provided between the shaft seat and the shaft seat bracket; a self-lubricating bearing sleeve (4) is provided between the inner side of the shaft seat end face and the transmission shaft, and the inner diameter of the self-lubricating bearing sleeve is slightly larger than the outer diameter of the transmission shaft (8); an annular soft packing sealing cavity (15) is provided on the inner shaft face of the shaft seat (1), and a soft packing injection port (3) and a soft packing injection valve (14) are provided on the outer shaft face of the shaft seat; a composite sealing body (7) is provided on the outer end face of the shaft seat and is fitted on the shaft; the composite sealing body is covered with a sealing shell (5) in a two-lobed half-shaped shape and is fitted on the shaft; a plurality of fastening bolt platforms (10) are provided on the sealing shell perpendicular to the slit, and the fastening bolts (11) fasten the two-lobed sealing shell (5) together at the fastening bolt platforms, thereby axially clamping the composite sealing body; a plurality of clamping bolts (16) compress the sealing shell, the composite sealing body, and the shaft seat into one.

2. The transmission shaft bearing and sealing seat assembly according to claim 1, characterized in that: The sealing shell is cut along the axial direction, and the cut has a certain width.

3. A transmission shaft bearing and sealing seat assembly according to claim 1 or 2, characterized in that: The angle between the sealing shell slit and the axisymmetric line connecting the two fastening bolts is 45°.

4. A transmission shaft bearing and sealing seat assembly according to claim 1 or 2, characterized in that: The width of the slit of the sealing shell is 0.1-4 mm.

5. The transmission shaft bearing and sealing seat assembly according to claim 1, characterized in that: The sealed shell is composed of three petals.

6. The transmission shaft bearing and sealing seat assembly according to claim 1, characterized in that: The sealed cavity in the sealed housing is in any one of a T-shape, a C-shape, a U-shape, a cone-shape, a truncated cone-shape and a V-shape.

7. The transmission shaft bearing and sealing seat assembly according to claim 1, characterized in that: The composite sealing body is composed of a plurality of sealing elastic bodies.

8. The transmission shaft bearing and sealing seat assembly according to claim 1, characterized in that: The outer wall surface of the composite sealing body is a conical surface.

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