CN217502583U - Sealing structure of horizontal screw type centrifugal machine - Google Patents
Sealing structure of horizontal screw type centrifugal machine Download PDFInfo
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- CN217502583U CN217502583U CN202220839078.2U CN202220839078U CN217502583U CN 217502583 U CN217502583 U CN 217502583U CN 202220839078 U CN202220839078 U CN 202220839078U CN 217502583 U CN217502583 U CN 217502583U
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Abstract
The utility model discloses a sealing structure of a horizontal screw centrifuge, which comprises a shell, a rotating shaft, a sealing body, a sealing ring, a shaft wheel and a bearing box; the sealing body is provided with an assembly hole, a labyrinth seal cavity is formed between the hole wall of the assembly hole and the rotating shaft, and the sealing body is also provided with a nitrogen injection hole communicated with the labyrinth seal cavity; the arbor has a blade extending toward an end face of the seal body. The utility model discloses a spiral shell formula of sleeping in centrifuge's seal structure forms the labyrinth seal chamber between pivot and seal, has prolonged sealed route, and is sealed effectual. Nitrogen is injected into the labyrinth seal cavity through the nitrogen injection hole, positive pressure in the labyrinth seal cavity can be maintained through the matching of the blades of the shaft wheel and the end face of the seal body, oil gas leakage is blocked through the nitrogen, and the sealing effect is further improved.
Description
Technical Field
The utility model relates to a spiral shell formula centrifuge technical field crouches especially relates to a spiral shell formula centrifuge's that crouches seal structure.
Background
Horizontal screw centrifuges, also known as horizontal screw decanter centrifuges, separate the suspended matter from the medium. The horizontal screw centrifuge is important equipment for solid-liquid separation of coal-to-liquids, coal chemical industry and oil residue extract. The horizontal screw centrifuge can generate oil gas when extracting oil residue, so that a sealing structure is needed for sealing, and the oil gas is prevented from leaking from the gap of the rotating shaft.
The sealing structure of the existing horizontal screw centrifuge mainly comprises a shell, a rotating shaft, a bearing box and the like, wherein the rotating shaft is a rotating shaft of a helical blade, the rotating shaft is arranged in the shell through a bearing, and the bearing in the bearing box is assembled on the rotating shaft. And a sealing element is also arranged on the rotating shaft and positioned on the outer side of the bearing box to play a role in sealing. Linear gaps are formed between the existing sealing elements and the rotating shaft, and oil gas can enter the gaps to leak in the rotating shaft running process.
In view of this, it is necessary to provide a sealing structure of a horizontal screw centrifuge having a good sealing effect.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome prior art's not enough, provide a seal structure of spiral shell formula centrifuge crouches that sealed effectual.
The technical scheme of the utility model provides a sealing structure of a horizontal screw centrifuge, which comprises a shell, a rotating shaft, a sealing body, a sealing ring, a shaft wheel and a bearing box;
the sealing body is provided with an assembly hole, the rotating shaft penetrates through the assembly hole, a labyrinth seal cavity is formed between the hole wall of the assembly hole and the rotating shaft, and the sealing body is also provided with a nitrogen injection hole communicated with the labyrinth seal cavity;
the seal ring is assembled between the seal body and the housing;
the shaft wheel and the bearing box are respectively assembled on the rotating shaft and are positioned at two opposite ends of the sealing body;
the arbor wheel has a blade extending toward an end face of the seal body;
the bearing box comprises a box body and a bearing arranged in the box body, the bearing is installed on the rotating shaft, the box body is sleeved on the rotating shaft, and the box body is connected with the sealing body.
In one optional technical scheme, a plurality of rotating shaft comb teeth are arranged on the rotating shaft, and a plurality of hole wall comb teeth are arranged on the hole wall of the assembling hole;
the rotating shaft comb teeth and the hole wall comb teeth are located in the labyrinth seal cavity, and are arranged in a staggered mode.
In an optional technical solution, the rotating shaft includes a first shaft section, a second shaft section and a third shaft section which are connected in sequence, wherein the radii of the first shaft section, the second shaft section and the third shaft section are increased in sequence;
the shaft wheel is assembled on the third shaft section, and the bearing box is assembled on the first shaft section;
the assembly holes are stepped holes and comprise a first assembly hole and a second assembly hole, and the radius of the first assembly hole is smaller than that of the second assembly hole;
the first assembly hole is assembled on the first shaft section, and the second assembly hole is assembled on the second shaft section;
the hole wall comb teeth are arranged on the hole wall of the second assembling hole, and the rotating shaft comb teeth are arranged on the second shaft section.
In an optional technical scheme, the hole wall of the first assembly hole is also provided with the hole wall comb teeth.
In one optional technical scheme, a first positioning groove is formed in the box body, and a positioning step is formed on the first shaft section;
an inner ring of the bearing is fitted on the positioning step, and an outer ring of the bearing is fitted in the first positioning groove.
In one optional technical scheme, a one-way valve is arranged in the nitrogen injection hole.
In one optional technical scheme, the sealing ring comprises at least three sections of fan rings, and the at least three sections of fan rings are connected by springs to form the sealing ring.
In an alternative embodiment, the outer ring surface of the sector ring has a sector ring groove, and the spring is located in the sector ring groove.
In one optional technical scheme, the shell comprises a mounting plate and a pressure plate detachably connected to one side of the mounting plate;
an assembly groove is formed between the mounting plate and the pressing plate;
the outer ring of the seal ring is clearance-fitted in the fitting groove.
In one optional technical scheme, the sealing body is provided with a positioning ring, and the box body is provided with a second positioning groove; the positioning ring is fitted in the second positioning groove.
By adopting the technical scheme, the method has the following beneficial effects:
the utility model provides a spiral shell formula centrifuge's for sleeping in seal structure forms the labyrinth seal chamber between pivot and seal, has prolonged sealed route, and is sealed effectual. Nitrogen is injected into the labyrinth seal cavity through the nitrogen injection hole, positive pressure in the labyrinth seal cavity can be maintained through the matching of the blades of the shaft wheel and the end face of the seal body, oil gas leakage is blocked through the nitrogen, and the sealing effect is further improved.
Drawings
The disclosure of the present invention will become more readily understood by reference to the drawings. It should be understood that: these drawings are for illustrative purposes only and are not intended to limit the scope of the present disclosure. In the figure:
fig. 1 is a schematic view of a sealing structure of a horizontal screw centrifuge according to an embodiment of the present invention;
FIG. 2 is a sectional view of the spindle;
FIG. 3 is a cross-sectional view of the seal body;
FIG. 4 is a cross-sectional view of multiple segments of the sealing ring connected together by springs;
FIG. 5 is a schematic view of the mounting plate, extension plate and pressure plate of the housing forming an assembly slot therebetween;
FIG. 6 is a schematic view of the housing having a first detent and a second detent;
FIG. 7 is a schematic view showing the bearing fitted between the positioning steps of the first positioning groove;
fig. 8 is a schematic view of the nitrogen injection tank mounted on the housing.
Detailed Description
The following describes the present invention with reference to the accompanying drawings. In which like parts are designated by like reference numerals. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1-3, an embodiment of the present invention provides a sealing structure of a horizontal screw centrifuge, including a casing 1, a rotating shaft 2, a sealing body 3, a sealing ring 4, a shaft wheel 5 and a bearing box 6.
The sealing body 3 is provided with an assembly hole 31, the rotating shaft 2 penetrates through the assembly hole 31, a labyrinth seal cavity 7 is formed between the hole wall of the assembly hole 31 and the rotating shaft 2, and the sealing body 3 is further provided with a nitrogen injection hole 32 communicated with the labyrinth seal cavity 7.
The seal ring 4 is fitted between the seal body 3 and the housing 1. The sheave 5 and the bearing housing 6 are fitted on the rotary shaft 2, respectively, at opposite ends of the seal body 3.
The arbor 5 has a blade 51 extending toward the end face of the sealing body 3.
The bearing box 6 comprises a box body 61 and a bearing 62 in the box body 61, the bearing 62 is installed on the rotating shaft 2, the box body 61 is sleeved on the rotating shaft 2, and the box body 61 is connected with the sealing body 3.
The utility model provides a spiral shell formula of sleeping in centrifuge's seal structure mainly includes casing 1, pivot 2, seal 3, sealing ring 4, arbor wheel 5, bearing box 6 and labyrinth seal chamber 7.
The housing 1 has a through hole, and the rotation shaft 2 is pivotably passed through the through hole of the housing 1. The seal body 3 is fitted on the rotary shaft 2, and the labyrinth seal chamber 7 is formed between the hole wall of the fitting hole 31 of the seal body 3 and the rotary shaft 2. The passage or the gap of the labyrinth seal cavity 7 is bent and extended, so that the oil-gas leakage path is prolonged, and a better oil-gas leakage prevention effect is achieved. When the rotating shaft 2 rotates, oil gas generated by the bearing 62 and the rotating shaft 2 passes through the labyrinth seal cavity 7, and the path of the labyrinth seal cavity 7 bends and extends, so that an oil gas leakage path is prolonged, and the bent path can also block oil gas leakage.
The seal ring 4 is fitted between the seal body 3 and the housing 1, and functions to seal a radial gap between the seal body 3 and the housing 1.
The seal body 3 has a nitrogen injection hole 32 therein, which communicates with the labyrinth chamber 7. As shown in fig. 8, the shell 1 of the horizontal screw centrifuge is provided with a nitrogen injection tank 8, and an air filling pipe 81 of the nitrogen injection tank 8 is connected with the nitrogen injection hole 32. When the horizontal screw centrifuge operates, the valve 82 on the nitrogen injection tank 8 is opened, nitrogen is injected into the labyrinth seal cavity 7, so that the labyrinth seal cavity 7 keeps positive pressure, oil and gas are isolated, and the effect of preventing oil and gas leakage is further improved.
The bearing housing 6 and the arbor 5 are both mounted on the rotating shaft 2, the bearing housing 6 and the arbor 5 being on opposite sides of the sealing body 3. The bearing housing 6 includes a housing 61 and a bearing 62, and the bearing 62 is installed in the housing 61. The bearing 62 is installed on the pivot 2, and box 61 cover is on the pivot 2, and box 61 is connected with seal 3.
The side of the wheel 5 facing the sealing body 3 has a plurality of blades 51, which blades 51 are intended to be clearance-fitted with the end face of the sealing body 3 in order to reduce the opening of the labyrinth chamber 7. When the shaft wheel 5 rotates, the blade 51 will rotate at the opening of the labyrinth seal cavity 7, and the rotating blade 51 forms a screen at the opening of the labyrinth seal cavity 7, preventing the nitrogen in the labyrinth seal cavity 7 from being discharged, so as to maintain the positive pressure in the labyrinth seal cavity 7.
When the rotating shaft 2 rotates, the box body 61, the sealing body 3, the sealing ring 4 and the shell 1 do not rotate, the shaft wheel 5 rotates along with the rotating shaft 2, the blade 51 rotates along with the rotating shaft, the blade 51 is in sliding contact with the end face of the sealing body 3 or the assembly gap between the blade 51 and the end face of the sealing body 3 is small (the assembly tolerance is smaller than 2mm), and the function of sealing the port of the uterine cavity 7 is achieved.
Therefore, the utility model provides a seal structure of spiral shell formula of sleeping in centrifuge forms labyrinth seal chamber 7 between pivot 2 and seal 3, has prolonged sealed route, and is sealed effectual. Through injecting nitrogen gas into labyrinth seal chamber 7, prevent nitrogen gas exhaust through blade 51 of arbor wheel 5, can maintain the malleation in the labyrinth seal chamber 7, come the separation oil gas leakage through nitrogen gas, further improved sealed effect.
In one embodiment, as shown in fig. 1-3, the shaft 2 is provided with a plurality of shaft comb teeth 24, and the wall of the assembly hole 31 is provided with a plurality of hole wall comb teeth 34. The rotating shaft comb teeth 24 and the hole wall comb teeth 34 are both positioned in the labyrinth seal cavity 7, and the rotating shaft comb teeth 24 and the hole wall comb teeth 34 are arranged in a staggered mode.
In this embodiment, the rotating shaft 2 is provided with a plurality of rotating shaft comb teeth 24 at intervals along the axial direction, and the hole wall of the fitting hole 31 is provided with a plurality of hole wall comb teeth 34 at intervals along the axial direction. The rotating shaft comb teeth 24 and the hole wall comb teeth 34 are located in the labyrinth seal cavity 7, the rotating shaft comb teeth 24 and the hole wall comb teeth 34 are arranged in a staggered mode, and each rotating shaft comb tooth 24 is in clearance fit between the two hole wall comb teeth 34, so that a plurality of turning areas are arranged in the path of the labyrinth seal cavity 7, and the effects of prolonging the oil gas leakage path and blocking oil gas leakage are achieved.
In one embodiment, as shown in fig. 1-3, the shaft 2 includes a first shaft segment 21, a second shaft segment 22, and a third shaft segment 23 connected in series. Wherein the radii of the first shaft segment 21, the second shaft segment 22 and the third shaft segment 23 increase in sequence.
The wheel 5 is fitted on the third shaft section 23 and the bearing housing 6 is fitted on the first shaft section 21.
The fitting hole 31 is a stepped hole, the fitting hole 31 includes a first fitting hole 311 and a second fitting hole 312, and a radius of the first fitting hole 311 is smaller than a radius of the second fitting hole 312.
The first fitting hole 311 is fitted on the first shaft segment 21, and the second fitting hole 312 is fitted on the second shaft segment 22.
Wherein, the hole wall comb teeth 34 are arranged on the hole wall of the second assembling hole 312, and the rotating shaft comb teeth 24 are arranged on the second shaft section 22.
In this embodiment, the rotating shaft 2 comprises a first shaft section 21, a second shaft section 22 and a third shaft section 23. The first shaft section 21, the second shaft section 22 and the third shaft section 23 are connected in sequence, and the radiuses of the first shaft section 21, the second shaft section 22 and the third shaft section 23 are increased in sequence.
The wheel 5 is fitted on the thicker third shaft section 23 and the bearing housing 6 is fitted on the thinner first shaft section 21.
The sealing body 3 is fitted on the step between the second shaft section 22 and the third shaft section 23.
The fitting hole 31 includes a first fitting hole 311 and a second fitting hole 312, the radius of the first fitting hole 311 is smaller than that of the second fitting hole 312, and the fitting hole 31 is a stepped hole.
When assembled, the first assembly hole 311 is assembled on the first shaft section 21, and the second assembly hole 312 is assembled on the second shaft section 22. The hole wall comb teeth 34 are arranged on the hole wall of the second assembling hole 312, and the rotating shaft comb teeth 24 are arranged on the second shaft section 22.
The step-shaped assembly hole 31 is assembled on the step between the second shaft section 22 and the third shaft section 23 to play a role of axial positioning, and the clearance between the second shaft section 22 and the second assembly hole 312 is a labyrinth seal cavity 7.
In one embodiment, as shown in fig. 1 and 3, the aperture wall of the first mounting aperture 311 is also provided with aperture wall teeth 34.
In this embodiment, the clearance between the first shaft segment 21 and the first assembling hole 311 and the clearance between the second shaft segment 22 and the second assembling hole 312 are both labyrinth seal cavities 7, which have better sealing effect.
In one embodiment, as shown in FIGS. 6-7, the housing 61 has a first positioning groove 611 therein and the first shaft segment 21 has a positioning step 211 thereon. The inner ring 622 of the bearing 62 is fitted on the positioning step 211, and the outer ring 621 of the bearing 62 is fitted in the first positioning groove 611.
In this embodiment, the outer ring 621 of the bearing 62 is in interference fit in the first positioning groove 611, the inner ring 622 of the bearing 62 is in interference fit on the positioning step 211, and the limit screw 212 is installed on the first shaft segment 21 to limit the inner ring 622 of the bearing 62 and prevent the inner ring 622 from being separated from the positioning step 211.
In one embodiment, as shown in FIG. 3, the nitrogen injection hole 32 has a check valve 33 therein to prevent nitrogen from escaping from the nitrogen injection hole 32.
In one embodiment, as shown in fig. 4, the sealing ring 4 comprises at least three segments of fan rings 41, and the at least three segments of fan rings 41 are connected by springs 42 and constitute the sealing ring 4.
In the initial state, the outer annular surface of the sector ring 41 contacts the housing 1, and the inner annular surface of the sector ring 41 contacts the seal body 3.
When the rotating shaft 2 rotates, if the gap between the housing 1 and the sealing body 3 changes due to assembly tolerance, for example, the gap between the housing 1 and the sealing body 3 slightly increases, the fan ring 41 pulled up by the spring 42 is adapted so that the seal ring 4 is kept fitted between the housing 1 and the sealing body 3.
In one embodiment, as shown in fig. 4, the outer ring surface of the sector ring 41 has a sector ring groove 411, and the spring 42 is located in the sector ring groove 411. When the fan ring is installed, the spring 42 is placed into the fan ring groove 411 from the notch of the fan ring groove 411, so that the installation is convenient. The spring 42 is in the sector ring groove 411, which can prevent the spring 42 from separating from the sector ring 41, and has good stability.
In one embodiment, as shown in fig. 5, the housing 1 includes a mounting plate 11 and a pressure plate 12 detachably attached to one side of the mounting plate 11. A fitting groove 13 is formed between the mounting plate 11 and the pressure plate 12. The outer ring of the seal ring 4 is clearance fitted in the fitting groove 13.
The pressure plate 12 is mounted on one side of the mounting plate 11 by bolts 14. The side of the mounting plate 11 facing the pressure plate 12 has a recess, and a mounting groove 13 is formed between the recess and the pressure plate 12.
When the sealing ring 4 is installed, the pressing plate 12 is firstly detached, the outer ring of the sealing ring 4 is assembled in the concave part of the installation plate 11, and then the pressing plate 12 is installed, so that the outer ring of the sealing ring 4 is assembled in the assembly groove 13 in a clearance mode, and the installation of the sealing ring 4 is facilitated.
The sealing ring 4 is slightly movable in the radial direction in the fitting groove 13 to accommodate a change in clearance between the housing 1 and the sealing body 3.
In one embodiment, as shown in fig. 1, 3 and 6-7, the sealing body 3 has a retaining ring 35 thereon and the housing 61 has a second retaining groove 612 thereon. The retaining ring 35 fits into the second retaining groove 612 for axial retention.
According to the needs, the above technical schemes can be combined to achieve the best technical effect.
What has been described above is merely the principles and preferred embodiments of the present invention. It should be noted that, for those skilled in the art, on the basis of the principle of the present invention, several other modifications can be made, and the protection scope of the present invention should be considered.
Claims (10)
1. A sealing structure of a horizontal screw centrifuge is characterized by comprising a shell, a rotating shaft, a sealing body, a sealing ring, a shaft wheel and a bearing box;
the sealing body is provided with an assembly hole, the rotating shaft penetrates through the assembly hole, a labyrinth seal cavity is formed between the hole wall of the assembly hole and the rotating shaft, and the sealing body is also provided with a nitrogen injection hole communicated with the labyrinth seal cavity;
the seal ring is assembled between the seal body and the housing;
the shaft wheel and the bearing box are respectively assembled on the rotating shaft and are positioned at two opposite ends of the sealing body;
the arbor wheel has a blade extending toward an end face of the seal body;
the bearing box comprises a box body and a bearing arranged in the box body, the bearing is installed on the rotating shaft, the box body is sleeved on the rotating shaft, and the box body is connected with the sealing body.
2. The seal structure of the horizontal screw centrifuge according to claim 1, wherein the rotating shaft is provided with a plurality of rotating shaft comb teeth, and the wall of the assembling hole is provided with a plurality of wall comb teeth;
the rotating shaft comb teeth and the hole wall comb teeth are both positioned in the labyrinth seal cavity, and the rotating shaft comb teeth and the hole wall comb teeth are arranged in a staggered mode.
3. The seal structure of a horizontal decanter centrifuge of claim 2, wherein said rotating shaft comprises a first shaft section, a second shaft section and a third shaft section connected in sequence, wherein the radii of said first shaft section, said second shaft section and said third shaft section increase in sequence;
the shaft wheel is assembled on the third shaft section, and the bearing box is assembled on the first shaft section;
the assembly holes are stepped holes and comprise a first assembly hole and a second assembly hole, and the radius of the first assembly hole is smaller than that of the second assembly hole;
the first assembly hole is assembled on the first shaft section, and the second assembly hole is assembled on the second shaft section;
the hole wall comb teeth are arranged on the hole wall of the second assembling hole, and the rotating shaft comb teeth are arranged on the second shaft section.
4. The seal structure of a horizontal decanter centrifuge according to claim 3, wherein said bore wall of said first fitting bore is also provided with said bore wall comb.
5. The seal structure of a horizontal decanter centrifuge of claim 3, wherein said housing has a first detent groove therein, said first shaft section having a detent step thereon;
an inner ring of the bearing is fitted on the positioning step, and an outer ring of the bearing is fitted in the first positioning groove.
6. The seal structure of a horizontal decanter centrifuge of claim 1, wherein said nitrogen injection port has a one-way valve therein.
7. A seal arrangement of a horizontal decanter centrifuge according to any of claims 1-6, wherein said seal ring comprises at least three segments of fan rings, said at least three segments of fan rings being connected by springs and constituting said seal ring.
8. The seal structure of a horizontal decanter centrifuge of claim 7, wherein said outer ring surface of said sector ring has a sector ring groove therein, and said spring is disposed in said sector ring groove.
9. A seal structure of a horizontal decanter centrifuge as claimed in any one of claims 1 to 6, wherein said housing comprises a mounting plate and a pressure plate detachably attached to one side of said mounting plate;
an assembly groove is formed between the mounting plate and the pressing plate;
the outer ring of the seal ring is clearance-fitted in the fitting groove.
10. The seal structure of a horizontal decanter centrifuge as defined in any one of claims 1-6, wherein said seal body has a positioning ring thereon, and said housing has a second positioning groove thereon;
the positioning ring is fitted in the second positioning groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220839078.2U CN217502583U (en) | 2022-04-12 | 2022-04-12 | Sealing structure of horizontal screw type centrifugal machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220839078.2U CN217502583U (en) | 2022-04-12 | 2022-04-12 | Sealing structure of horizontal screw type centrifugal machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217502583U true CN217502583U (en) | 2022-09-27 |
Family
ID=83350396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220839078.2U Active CN217502583U (en) | 2022-04-12 | 2022-04-12 | Sealing structure of horizontal screw type centrifugal machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217502583U (en) |
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2022
- 2022-04-12 CN CN202220839078.2U patent/CN217502583U/en active Active
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