An adjustable oil seal at the shaft end of a fly ash mixer

Abstract

The present invention relates to an adjustable oil seal at the shaft end of a fly ash mixer, comprising a support frame, a shaft end flange, a sealing ring cover, and a Y-ring sleeved on the main shaft of the mixer, wherein the support frame is sealed and fixed to the outer wall of the mixer, the shaft end flange is arranged between the main shaft and the outer wall and is fixed to the front end of the support frame, the inner hole of the support frame is stepped and has a first shaft shoulder, the sealing ring cover is arranged in the support frame and its rear end abuts against the first shaft shoulder, a first chamber is formed between the support frame, the sealing ring cover, the shaft end flange, and the main shaft, and the Y-ring is installed in the first chamber and seals the gap between the main shaft and the support frame. The advantages are: the shaft gap is sealed by the shaft surface sealing structure and the wall surface sealing structure together, thereby ensuring the sealing effect and avoiding the occurrence of slurry leakage; the elastic compensation amount of the O-ring and the packing ring is increased by the adjustment mechanism, thereby effectively extending their service life.

Description

Technical Field

[0001] The invention relates to an oil seal, in particular to an adjustable oil seal at the shaft end of a fly ash mixer. Background Art

[0002] Fly ash mixer is a fly ash mixing device commonly used in fly ash solidification and stabilization processes. Its operating principle is to drive the mixing blades through the rotation of its main shaft to forcibly mix the fly ash, chelating solution, cement, etc. inside the mixer, so that the fly ash is evenly mixed in the violent relative movement.

[0003] However, as the mixer is used for a long time, its shaft end sealing structure gradually fails due to wear, resulting in leakage of the fly ash slurry mixed inside the mixer. In the prior art, once the fly ash slurry leakage occurs, the mixer needs to be shut down and the shaft end seal replaced before it can be used again, resulting in a certain amount of resource waste. Summary of the invention

[0004] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide an adjustable oil seal at the shaft end of a fly ash mixer, which can effectively extend the service life of the shaft end seal and avoid waste of resources.

[0005] Technical solution: An adjustable oil seal at the shaft end of a fly ash mixer, comprising a support frame, a shaft end flange, a sealing ring cover, and a Y-ring which are sleeved on the main shaft of the mixer. The support frame is sealed and fixed to the outer wall of the mixer. The shaft end flange is arranged between the main shaft and the outer wall and is fixed to the front end of the support frame. The inner hole of the support frame is stepped and has a first shaft shoulder. The sealing ring cover is arranged in the support frame and its rear end abuts against the first shaft shoulder. A first chamber is formed between the support frame, the sealing ring cover, the shaft end flange, and the main shaft. The Y-ring is installed in the first chamber and seals the gap between the main shaft and the support frame.

[0006] The principle of the present invention is that the shaft end flange is arranged between the main shaft and the outer wall and is fixed to the front end of the support frame, which can prevent the fly ash leakage from directly eroding the support frame and play a certain protective role. In the first chamber formed between the support frame, the sealing ring cover, the shaft end flange and the main shaft, the gap between the support frame and the shaft end flange, the gap between the shaft end flange and the main shaft are the entrance of the first chamber, and the gap between the support frame and the sealing ring cover, the gap between the sealing ring cover and the main shaft are the outlet of the first chamber. When the fly ash leakage slurry invades from the gap between the shaft end flange and the outer wall, under the effect of the sealing and fixing of the support frame and the outer wall, the fly ash leakage slurry cannot leak from the wall surface along the gap between the support frame and the outer wall, forming a wall surface sealing structure; when the fly ash leakage slurry invades from the entrance of the first chamber, because the Y-shaped ring seals the gap between the main shaft and the support frame, that is, the fly ash leakage slurry cannot leak from the outlet of the first chamber, forming an axial surface sealing structure. Thereby, the sealing of the shaft gap of the mixer is realized as a whole, and the generation of fly ash leakage slurry is avoided.

[0007] Furthermore, it also includes a sealing ring frame sleeved on the main shaft, the sealing ring frame is arranged in the first chamber and divides the first chamber into at least two compartments, each of which is respectively installed with the Y-shaped ring. The first chamber is divided into multiple compartments, and each is sealed by a Y-shaped ring, forming a multiple sealing structure, thereby improving the sealing performance and extending the sealing life.

[0008] Furthermore, it also includes a wear-resistant sleeve sleeved on the main shaft, the wear-resistant sleeve is sealed with the main shaft and rotates with the main shaft, and the sealing ring cover and the Y-ring are sleeved on the wear-resistant sleeve. Since the Y-ring and the main shaft are in a dynamic sealing structure, relative rotation occurs, causing the Y-ring to be easily worn. Adding a wear-resistant sleeve is beneficial to improving the wear resistance of the Y-ring.

[0009] Furthermore, it also includes a floating oil seal sleeved on the main shaft, the floating oil seal is arranged behind the sealing ring cover, the support frame also has a second shoulder located behind the first shoulder, the floating oil seal includes an O-ring, a static floating seal seat, a dynamic floating seal seat, a static ring, and a dynamic ring, the static ring and the dynamic ring are sleeved on the wear-resistant sleeve to form a sealing structure, the static floating seal seat is fixed on the second shoulder, the dynamic floating seal seat is fixed on the wear-resistant sleeve, a rotation gap is formed between the dynamic floating seal seat and the static floating seal seat, the support frame, and the sealing ring cover, the O-ring is sleeved between the static floating seal seat and the static ring, and between the dynamic floating seal seat and the dynamic ring to seal the rotation gap, so as to form a second axial surface sealing structure using the floating oil seal.

[0010] Furthermore, the static floating seal seat is integrally formed with the support frame, and the dynamic floating seal seat is integrally formed with the wear-resistant shaft sleeve, so as to facilitate the positioning and installation of the floating oil seal.

[0011] Furthermore, the rotating gap is in a labyrinth shape, so as to form a third axial surface sealing structure by utilizing a labyrinth seal.

[0012] Furthermore, an oil filling hole is provided on the support frame, and the oil filling hole is connected to the rotating gap and the oil replenishing device outside the support frame. The rotating gap and the floating oil seal are replenished with oil through the oil filling hole, the oil pressure in the floating oil seal is maintained, and it is conducive to forming a layer of oil sealing film in the rotating gap, which has a good effect on preventing slurry leakage.

[0013] Furthermore, it also includes a packing ring mounted on the main shaft, and the support frame also has a third shoulder located behind the second shoulder. A second chamber is formed between the third shoulder, the support frame, the main shaft, and the rear end of the wear-resistant sleeve. The packing ring is installed in the second chamber against the third shoulder and seals the gap between the main shaft and the support frame, forming a fourth axial surface sealing structure.

[0014] Furthermore, it also includes a clamping ring fixed on the main shaft and rotating with the main shaft, the clamping ring is arranged at the front end of the wear-resistant sleeve, the clamping ring and the wear-resistant sleeve are connected by a tightening screw, and the wear-resistant sleeve is pushed backward by slightly adjusting the tightening screw to squeeze the packing ring and the O-ring, thereby increasing the elastic compensation amount of the packing ring and the O-ring. As the main shaft rotates, the O-ring and the packing ring gradually wear out, and their elastic compensation amount gradually decreases, resulting in a gradually increasing probability of slurry leakage. At this time, by rotating the tightening screw, the wear-resistant sleeve is pushed backward with the clamping ring as a fulcrum, and the O-ring and the packing ring are squeezed at the same time, thereby increasing their elastic compensation amount and extending their service life.

[0015] Furthermore, the connection between the clamping ring and the wear-resistant sleeve is sealed by a yellow rubber ring. When adjusting the tightening screw, a gap will be generated between the clamping ring and the wear-resistant sleeve. The yellow rubber ring can effectively prevent the mixed fly ash slurry from falling into it, and the elasticity of the yellow rubber ring can also better adapt to the expansion or contraction of the gap.

[0016] Beneficial effects: Compared with the prior art, the advantages of the present invention are: the axial surface sealing structure and the wall surface sealing structure are used to seal the axial gap together, thereby ensuring the sealing effect and avoiding the occurrence of slurry leakage; the elastic compensation amount of the O-ring and the packing ring is increased by the adjustment mechanism, thereby effectively extending their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the present invention;

[0018] Figure 2 for Figure 1 A magnified schematic diagram of position A in the middle;

[0019] Figure 3 It is a schematic diagram of the structure of the first chamber, the second chamber and the third sealed chamber. DETAILED DESCRIPTION

[0020] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. These embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0021] An adjustable oil seal at the shaft end of a fly ash mixer, as shown in the attached Figure 1 As shown, it includes a support frame 1 sleeved on the main shaft 100 of the mixer, a shaft end flange 2, a sealing ring cover 3, a Y-ring 4, a sealing ring frame 5, a wear-resistant sleeve 6, a floating oil seal 7, a packing ring 8, a retaining ring 9, and a yellow rubber ring 10.

[0022] The support frame 1 is sealed and fixed to the outer wall 101 of the mixer, for example, by installing a static seal between the support frame 1 and the outer wall 101. The inner hole of the support frame 1 is stepped and has a first shoulder 11, a second shoulder 12 located behind the first shoulder 11, and a third shoulder 14 located behind the second shoulder 12.

[0023] The shaft end flange 2 is disposed between the main shaft 100 and the outer wall 101 and fixed to the front end of the support frame 1 to prevent the fly ash slurry from directly eroding the support frame.

[0024] As attached Figure 3 As shown, in this embodiment, multiple independent chambers are arranged inside the support frame and sealed respectively to achieve the effect of forming multiple axial surface seals. The specific structure is as follows:

[0025] The first axial seal structure:

[0026] The sealing ring cover 3 is arranged in the support frame 1 and its rear end abuts against the first shaft shoulder 11. The support frame 1, the sealing ring cover 3, the shaft end flange 2, and the main shaft 100 form a first chamber 1-1. The Y-ring 4 is installed in the first chamber 1-1 and seals the gap between the main shaft 100 and the support frame 1. The sealing ring frame 5 is arranged in the first chamber 1-1 and divides the first chamber 1-1 into at least two compartments, and a Y-ring 4 is installed in each compartment.

[0027] In order to prevent the Y-ring from wearing too fast, a wear-resistant sleeve 6 is provided: the wear-resistant sleeve 6 is sealed with the main shaft 100 and rotates with the main shaft 100 , and the sealing ring cover 3 and the Y-ring 4 are sleeved on the wear-resistant sleeve 6 .

[0028] Second axial face seal structure:

[0029] The floating oil seal 7 is arranged behind the sealing ring cover 3. Figure 2As shown, the floating oil seal 7 includes an O-ring 71, a static floating seal seat 72, a dynamic floating seal seat 73, a static ring 74, and a dynamic ring 75. The static ring 74 and the dynamic ring 75 are sleeved on the wear-resistant sleeve 6 to form a sealing structure. The static floating seal seat 72 is fixed on the second shaft shoulder 12, and the dynamic floating seal seat 73 is fixed on the wear-resistant sleeve 6. A rotation gap 1-2 is formed between the dynamic floating seal seat 73 and the static floating seal seat 72, the support frame 1, and the sealing ring cover 3. The O-ring 71 is sleeved between the static floating seal seat 72 and the static ring 74, and between the dynamic floating seal seat 73 and the dynamic ring 75 to seal the rotation gap 1-2. In this embodiment, the static floating seal seat 72 is preferably integrally formed with the support frame 1, and the dynamic floating seal seat 73 is preferably integrally formed with the wear-resistant sleeve 6, so as to facilitate the positioning and installation of the floating oil seal.

[0030] The third sealing structure:

[0031] The rotating gap 1-2 is preferably in a maze shape.

[0032] The fourth sealing structure:

[0033] A second chamber 1 - 3 is formed between the third shaft shoulder 13 , the support frame 1 , the main shaft 100 , and the rear end of the wear-resistant sleeve 6 . The packing ring 8 is installed in the second chamber 1 - 3 against the third shaft shoulder 14 and seals the gap between the main shaft 100 and the support frame 1 .

[0034] This embodiment also has an oil replenishment mechanism:

[0035] The support frame 1 is provided with an oil filling hole 13, which is connected to the rotating gap 1-2 and the oil replenishing device outside the support frame 1. The rotating gap and the floating oil seal are replenished with oil through the oil filling hole, the oil pressure in the floating oil seal is maintained, and it is conducive to forming a layer of oil sealing film in the rotating gap, which has a good effect on preventing slurry leakage.

[0036] This embodiment also has an adjustment mechanism:

[0037] The snap ring 9 is fixed on the main shaft 100 and rotates with the main shaft 100. The snap ring 9 is set at the front end of the wear-resistant sleeve 6. The snap ring 9 and the wear-resistant sleeve 6 are connected by a tightening screw. The tightening screw is slightly adjusted to push the wear-resistant sleeve 6 backward to squeeze the packing ring 8 and the O-ring 71, thereby increasing the elastic compensation amount of the packing ring 8 and the O-ring 71. As the main shaft rotates, the O-ring and the packing ring gradually wear, and their elastic compensation amount gradually decreases, resulting in a gradually increasing probability of slurry leakage. At this time, by rotating the tightening screw, the wear-resistant sleeve is pushed backward with the snap ring as a fulcrum, and the O-ring and the packing ring are squeezed at the same time, increasing their elastic compensation amount to extend their service life. When the adjusting mechanism is in use, the tightening screw is rotated, and a gap is generated between the retaining ring and the wear-resistant sleeve. If the mixed fly ash slurry falls into the gap, it will cause problems such as poor adjustment. In this embodiment, the connection between the retaining ring 9 and the wear-resistant sleeve 6 is sealed by a yellow rubber ring 10 to prevent the fly ash slurry from falling into the gap, and the elasticity of the yellow rubber ring can also better adapt to the expansion or contraction of the gap.

[0038] When in use, if the fly ash leakage slurry intrudes from the gap between the shaft end flange and the outer wall, the fly ash leakage slurry cannot leak along the wall surface under the sealing effect of the support frame and the outer wall, that is, a wall surface sealing structure is formed; when the fly ash leakage slurry intrudes from the gap between the support frame and the shaft end flange, and the gap between the shaft end flange and the main shaft, the fly ash leakage slurry cannot leak along the shaft surface, that is, a shaft surface sealing structure is formed. This embodiment ensures the mechanical sealing effect and avoids the occurrence of leakage by setting four shaft surface seals and one wall surface seal.

Claims

1. An adjustable oil seal at the shaft end of a fly ash mixer, characterized in that: The invention comprises a support frame (1) sleeved on the main shaft of the mixer, a shaft end flange (2), a sealing ring cover (3), and a Y-shaped ring (4); the support frame (1) is sealed and fixed to the outer wall of the mixer; the shaft end flange (2) is arranged between the main shaft and the outer wall and is fixed to the front end of the support frame (1); the inner hole of the support frame (1) is stepped and has a first shaft shoulder (11); the sealing ring cover (3) is arranged in the support frame (1) and its rear end abuts against the first shaft shoulder (11); a first chamber (1-1) is formed between the support frame (1), the sealing ring cover (3), the shaft end flange (2), and the main shaft; the Y-shaped ring (4) is installed in the first chamber (1-1) and seals the gap between the main shaft and the support frame (1); It also includes a wear-resistant sleeve (6) sleeved on the main shaft, the wear-resistant sleeve (6) is sealed with the main shaft and rotates with the main shaft, and the sealing ring cover (3) and the Y-shaped ring (4) are sleeved on the wear-resistant sleeve (6); The invention also comprises a floating oil seal (7) sleeved on the main shaft, the floating oil seal (7) being arranged behind the sealing ring cover (3), the support frame (1) also having a second shaft shoulder (12) located behind the first shaft shoulder (11), the floating oil seal (7) comprising an O-ring (71), a static floating seal seat (72), a dynamic floating seal seat (73), a static ring (74), and a dynamic ring (75), the static ring (74) and the dynamic ring (75) being sleeved on the wear-resistant shaft sleeve (6) to form a sealing structure. The static floating seal seat (72) is fixedly mounted on the second shaft shoulder (12), the dynamic floating seal seat (73) is fixedly mounted on the wear-resistant shaft sleeve (6), a rotation gap (1-2) is formed between the dynamic floating seal seat (73), the static floating seal seat (72), the support frame (1), and the sealing ring cover (3), and the O-ring (71) is sleeved between the static floating seal seat (72) and the static ring (74), and between the dynamic floating seal seat (73) and the dynamic ring (75) to seal the rotation gap (1-2); It also includes a packing ring (8) sleeved on the main shaft, the support frame (1) also has a third shaft shoulder (14) located behind the second shaft shoulder (12), a second chamber (1-3) is formed between the third shaft shoulder (14), the support frame (1), the main shaft, and the rear end of the wear-resistant sleeve (6), the packing ring (8) is installed in the second chamber (1-3) against the third shaft shoulder (14) and seals the gap between the main shaft and the support frame (1); The invention also includes a retaining ring (9) fixed on the main shaft and rotating with the main shaft, the retaining ring (9) being arranged at the front end of the wear-resistant sleeve (6), the retaining ring (9) and the wear-resistant sleeve (6) being connected via a tensioning screw, and the wear-resistant sleeve (6) is pushed backward by slightly adjusting the tensioning screw to squeeze the packing ring (8) and the O-ring (71), thereby increasing the elastic compensation amount of the packing ring (8) and the O-ring (71); and also includes a sealing ring frame (5) sleeved on the main shaft, the sealing ring frame (5) being arranged in the first chamber (1-1) and the first chamber (1-1) being provided with the sealing ring frame (5). A chamber (1-1) is divided into at least two compartments, each of which is respectively provided with the Y-shaped ring (4); the static floating seal seat (72) is integrally formed with the support frame (1), and the dynamic floating seal seat (73) is integrally formed with the wear-resistant shaft sleeve (6); the rotating gap (1-2) is in a maze shape; an oil filling hole (13) is provided on the support frame (1), and the oil filling hole (13) is connected with the rotating gap (1-2) and the oil replenishing device outside the support frame (1); the connection between the retaining ring (9) and the wear-resistant shaft sleeve (6) is sealed by a yellow rubber ring (10).

Images