CN215109650U - Centrifugal fan seal structure - Google Patents
Centrifugal fan seal structure Download PDFInfo
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- CN215109650U CN215109650U CN202121538156.7U CN202121538156U CN215109650U CN 215109650 U CN215109650 U CN 215109650U CN 202121538156 U CN202121538156 U CN 202121538156U CN 215109650 U CN215109650 U CN 215109650U
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Abstract
The utility model relates to a centrifugal fan seal structure belongs to centrifuge technical field. The utility model discloses a centrifugal fan sealing structure, which comprises a fan shell, a shaft body, an inner ring, a carbon ring and an elastic shrinking piece; the fan shell is provided with a cavity; an opening at one end of the cavity is positioned on the fan shell, and an opening at the other end of the cavity is positioned on the surface contacted with the shaft body; the inner ring is detachably and fixedly sleeved on the shaft body; the carbon ring is sleeved on the surface of the inner ring through an elastic tightening piece; the fan shell is connected with the carbon ring in a clamping mode through the groove. The carbon ring is fixed on the fan shell and is always in close contact with the inner ring to form contact seal; the cavity is supplemented with nitrogen, the pressure of the nitrogen is slightly higher than that of the fan, and the leaked gas can be jacked back and cannot be leaked into the air. The carbocycle contacts with the inner ring, and the carbocycle can not wear the shaft body in the running process of the machine. The utility model discloses can guarantee the life that can also compromise the machine when sealing performance.
Description
Technical Field
The utility model relates to a centrifugal fan seal structure belongs to centrifuge technical field.
Background
The centrifugal fan is a fan which boosts gas by means of mechanical energy and discharges the boosted gas. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draught of boilers and industrial kilns. In the manufacturing process of products in chemical fiber industry, pharmaceutical industry and the like, various toxic and harmful and corrosive waste gases can be generated, and the toxic and harmful and corrosive waste gases are conveyed to a treatment center for treatment by adopting a sealed pipeline and a centrifugal fan; in the conveying process of the centrifugal fan, once waste gas leaks from the shaft center sealing part, the body health of workers can be seriously threatened, and the environment is influenced. In order to prevent waste gas from leaking out from the joint of the main shaft of the centrifugal fan and the shell, the centrifugal fan applied in the field of chemical machinery has extremely strict requirements on the sealing performance of the shaft center sealing part.
On one hand, the sealing performance is excellent, and the sealing device can bear larger gas pressure; on the other hand, the sealing performance is ensured, and meanwhile, the service life of the machine is also considered.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a centrifugal fan seal structure that can also compromise the life of machine when guaranteeing sealing performance.
The technical scheme of the utility model as follows:
a centrifugal fan sealing structure comprises a fan shell and a shaft body; the improvement is that the device also comprises an inner ring, a carbon ring and an elastic constriction piece;
the inner ring is a hollow cylinder which can be sleeved on the shaft body;
the carbon ring is an assembled ring, and a circle of groove for mounting the elastic tightening piece is formed in the outer surface of the carbon ring;
the fan shell is provided with a groove which can be clamped with the carbon ring in shape; the fan shell is provided with a cavity; an opening at one end of the cavity is positioned on the surface of the fan shell, and an opening at the other end of the cavity is positioned on the surface of the fan shell, which is in contact with the shaft body;
the inner ring is detachably and fixedly sleeved on the shaft body; the carbon ring is sleeved on the surface of the inner ring through an elastic tightening piece; the fan shell is connected with the carbon ring in a clamping mode through the groove.
The utility model discloses a centrifugal fan seal structure mainly is applicable to the transport of harmful, toxic gas, sulfur dioxide for example. The utility model discloses a centrifugal fan sealing structure, the carbon ring of which is a static ring and the inner ring of which is a dynamic ring; when the shaft body rotates, the inner ring rotates along with the shaft body; the carbon ring is fixed on the fan shell and is always in close contact with the inner ring under the binding action of the elastic tightening piece; forming a contact seal; thereby effectively avoiding harmful gas to reveal from the gap of axis body and fan casing. The utility model discloses set up the aim at protection axis body of inner ring, prevent that the axis body from being worn and torn by the carbocycle to guarantee the life of machine. If not set up the inner ring, the carbocycle then directly contacts with the axis body, and the intensity of carbocycle is higher than the height of axis body, wears the axis body at the contact friction in-process to shorten the life of machine. After the inner ring is arranged, the carbon ring is in contact with the inner ring, and the carbon ring cannot be in contact with the shaft body in the running process of the machine, so that the shaft body cannot be abraded; after the inner ring is worn, only the inner ring needs to be replaced; thereby ensuring the service life of the machine.
As the machine operates, the inner ring wears; the carbocycle is for piecing together the ring, and along with the wearing and tearing of inner ring, the carbocycle tightens up under the effect of elasticity piece that contracts to guarantee that the internal surface of carbocycle all the time and inner ring surface in close contact with, guarantee that sealed effect can not be along with using wearing and tearing and variation. In addition, a cavity is arranged on the fan shell; when the machine runs, the cavity is supplemented with nitrogen, the pressure of the nitrogen is slightly higher than that of the fan, even if the carbon ring is sealed to slightly leak, the pressure of the nitrogen is higher than that of harmful and toxic gas, the leaked harmful and toxic gas can be jacked back, and the nitrogen is not leaked into the air.
In the sealing structure of the centrifugal fan, the elastic locking piece is used for tightening the carbon ring so as to enable the carbon ring to be always in close contact with the inner ring; thus, any of the known elastic constrictions may be used. Preferably, the elastic constricting element is a spring; the spring is placed in the groove of the carbon ring and is connected end to end. The spring is a common mechanical part with low manufacturing cost; the purpose of using springs as the elastic constrictions is to reduce costs.
Above-mentioned centrifugal fan seal structure is in order to make the relation of connection between carbocycle and the fan casing more firm under the condition of guaranteeing carbocycle and inner ring in close contact with, preferably, the carbocycle is selected three lamellas to piece together the ring or four lamellas are pieced together the ring.
Preferably, the shaft body is provided with a positioning hole, and the inner ring is provided with a through hole matched with the positioning hole; the shaft body is connected with the inner ring through a positioning pin. The number of the positioning holes and the positioning pins can be selected by the prior art; preferably, set up a locating hole in axis body one end, can realize the fixed connection dismantled of inner ring and axis body.
Above-mentioned centrifugal fan seal structure, in order to further guarantee sealed effect, it is preferred, carbocycle and the quantity of elasticity piece of contracting are four.
In the sealing structure of the centrifugal fan, preferably, when the number of the carbon rings is four, the opening of the cavity on the contact surface of the shaft body is located between two carbon rings and the other two carbon rings; the carbon rings are arranged in an axisymmetric manner around the opening.
Advantageous effects
1. Can also compromise the life of machine when guaranteeing the sealing performance of fan casing and axis body.
2. Meanwhile, contact sealing and dry gas sealing are realized, and the sealing effect is good; can basically ensure the 'zero leakage' of the conveying medium to the atmosphere;
3. simple structure and low cost.
Drawings
Fig. 1 is a schematic structural diagram of a sealing structure of a centrifugal fan.
In the figure, 1 is a fan shell, 2 is a shaft body, 3 is an inner ring, 4 is a carbon ring, 5 is a spring, 6 is a cavity, and 7 is a positioning pin.
Detailed Description
The present invention will be further described with reference to the accompanying drawings. The embodiment of the present invention is only provided for illustrating a specific structure, and the scale of the structure is not limited by the embodiment.
The utility model discloses a centrifugal fan seal structure, including fan casing 1, axis body 2, inner ring 3, carbocycle 4, spring 5 and locating pin 7. The number of the carbon rings 4 and the springs 5 is four.
The inner ring 3 is a hollow cylinder which can be matched with the shaft body, and the length of the inner ring is equal to or slightly less than that of the shaft body 2; the inner diameter of the shaft body is slightly larger than the diameter of the shaft body 2 so as to ensure that the shaft body can be sleeved on the shaft body 2 and can be tightly attached to the shaft body 2. One end of the shaft body 2 is provided with a positioning hole for installing a positioning pin 7; the inner ring 3 is provided with a through hole which has the same inner diameter as the positioning hole and is used for installing the positioning pin 7. The through holes or the positioning holes are one or more than two.
The carbocycle 4 is a split ring; can be a two-piece split ring, a three-piece split ring or a four-piece split ring; the outer surface of the carbon ring 4 is provided with a circle of groove for mounting the spring 5. The carbocycle 4 is sleeved on the surface of the inner ring 3.
Four grooves are formed in the fan shell 1, and the shape of each groove is matched with the shape of the carbon ring 4, so that the carbon ring 4 is connected with the fan shell 1 in a clamping mode. A cavity 6 is formed in the fan shell 1, an opening A at one end of the cavity 6 is positioned on the surface of the fan shell 1, and an opening B at the other end of the cavity is positioned on the surface of the fan shell 1, which is in contact with the shaft body 2; the cavity 6 opening B is located between two carbon rings 4 and the other two carbon rings 4. Wherein, the recess on the fan casing 1 uses 6 openings B of cavity as symmetry axisymmetrical distribution.
Example 1
Selecting an inner ring with the length slightly smaller than that of the shaft body 2, sleeving the inner ring 3 on the shaft body 2, aligning a through hole in the inner ring 3 with a positioning hole in the shaft body, and installing a positioning pin 7; the shaft body 2 and the inner ring 3 are detachably and fixedly connected. The carbon ring 4 of the three-petal splicing ring is sleeved on the inner ring 3, and the spring 5 is arranged in the groove of the inner ring 3 and is connected end to bind and fasten the carbon ring 4. After the four carbon rings 4 are installed, covering the fan shell 1 outside the carbon rings 4, and enabling the four carbon rings 4 to be respectively arranged in the grooves of the fan shell 1 and clamped; in other words, the carbon ring 4 and the fan housing 1 are connected in a snap-fit manner.
Example 2
Selecting an inner ring with the length equal to that of the shaft body 2, sleeving the inner ring 3 on the shaft body 2, aligning a through hole in the inner ring 3 with a positioning hole in the shaft body, and installing a positioning pin 7; the shaft body 2 and the inner ring 3 are detachably and fixedly connected. The carbon ring 4 of the four-petal splicing ring is sleeved on the inner ring 3, and the spring 5 is arranged in the groove of the inner ring 3 and is connected end to bind and fasten the carbon ring 4. After the four carbon rings 4 are installed, covering the fan shell 1 outside the carbon rings 4, and enabling the four carbon rings 4 to be respectively arranged in the grooves of the fan shell 1 and clamped; in other words, the carbon ring 4 and the fan housing 1 are connected in a snap-fit manner.
When the fan runs, the shaft body 2 drives the inner ring 3 to rotate together, and the fan shell 1 and the carbon ring 4 are fixed; the carbon ring 4 and the inner ring 3 are always in a contact state to form contact type sealing. When the inner ring 3 is worn, the carbon ring 4 is tightened under the fastening action of the spring 5, so that the carbon ring 4 is always in contact with the inner ring 3 in the service life. Through 6 supplementary nitrogen gas in the middle of four carbocycles 4 of cavity on the fan casing 1, nitrogen gas pressure is higher than fan pressure a little, even the carbocycle 4 is sealed to have slight leakage, nitrogen gas pressure height also can push back the sulfur dioxide of leaking, is unlikely to leak in the air.
Claims (7)
1. The utility model provides a centrifugal fan seal structure, includes fan casing and axis body, its characterized in that: also included are inner rings, carbocyclic rings, and elastic constrictions;
the inner ring is a hollow cylinder which can be sleeved on the shaft body;
the carbon ring is an assembled ring, and a circle of groove for mounting the elastic tightening piece is formed in the outer surface of the carbon ring;
the fan shell is provided with a groove which can be clamped with the carbon ring in shape; the fan shell is provided with a cavity; an opening at one end of the cavity is positioned on the surface of the fan shell, and an opening at the other end of the cavity is positioned on the surface of the fan shell, which is in contact with the shaft body;
the inner ring is detachably and fixedly sleeved on the shaft body; the carbon ring is sleeved on the surface of the inner ring through an elastic tightening piece; the fan shell is connected with the carbon ring in a clamping mode through the groove.
2. The centrifugal fan seal structure according to claim 1, characterized in that: the elastic tightening piece is a spring; the spring is placed in the groove of the carbon ring and is connected end to end.
3. The centrifugal fan seal structure according to claim 1 or 2, characterized in that: the carbocycle is a three-petal splicing ring or a four-petal splicing ring.
4. The centrifugal fan seal structure according to claim 3, characterized in that: the shaft body is provided with a positioning hole, and the inner ring is provided with a through hole matched with the positioning hole; the shaft body is connected with the inner ring through a positioning pin.
5. The centrifugal fan seal structure according to claim 4, characterized in that: one end of the shaft body is provided with a positioning hole.
6. The centrifugal fan seal structure according to claim 5, characterized in that: the number of carbon rings and elastic constrictions is four.
7. The centrifugal fan seal structure according to claim 6, characterized in that: when the number of the carbon rings is four, the opening of the cavity on the contact surface of the shaft body is positioned between two carbon rings and the other two carbon rings; the carbon rings are arranged in an axisymmetric manner around the opening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121538156.7U CN215109650U (en) | 2021-07-07 | 2021-07-07 | Centrifugal fan seal structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121538156.7U CN215109650U (en) | 2021-07-07 | 2021-07-07 | Centrifugal fan seal structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215109650U true CN215109650U (en) | 2021-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121538156.7U Active CN215109650U (en) | 2021-07-07 | 2021-07-07 | Centrifugal fan seal structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215109650U (en) |
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2021
- 2021-07-07 CN CN202121538156.7U patent/CN215109650U/en active Active
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