CN215110491U - Coal mill frame sealing device and coal mill - Google Patents
Coal mill frame sealing device and coal mill Download PDFInfo
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- CN215110491U CN215110491U CN202120441669.XU CN202120441669U CN215110491U CN 215110491 U CN215110491 U CN 215110491U CN 202120441669 U CN202120441669 U CN 202120441669U CN 215110491 U CN215110491 U CN 215110491U
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Abstract
The utility model provides a coal mill frame sealing device and a coal mill, belonging to the technical field of coal mills, comprising a primary sealing component and a secondary sealing component, wherein the primary sealing component and the secondary sealing component are sleeved on a transmission shaft through a fastening component to form secondary sealing; the primary sealing assembly is in floating seal, the secondary sealing assembly is in static seal, the primary sealing assembly is tightly attached to the base of the coal mill, and the secondary sealing assembly is tightly attached to the outer side of the primary sealing assembly. The utility model provides a coal pulverizer frame sealing device utilizes the second grade to seal, reaches sealed effect, can prolong sealing device holistic life, reduces cost of maintenance; because the static seal is convenient to replace and maintain on the outer side, the maintenance downtime can be shortened.
Description
Technical Field
The utility model belongs to the technical field of the coal pulverizer, more specifically say, relate to a coal pulverizer frame sealing device and utilize the sealed coal pulverizer of this sealing device.
Background
The coal mill is the core equipment of thermal power generation, and is directly related to the normal operation of a generator set. At present, the phenomena of air leakage and powder leakage at a transmission shaft of a base of a coal mill are more, the leaked dust pollutes the environment, the coal mill is buried by the dust due to the larger leakage, and the coal mill has to be stopped. In the existing sealing device, a carbon sealing ring is composed of multiple sections, the inner side of the carbon sealing ring is in contact friction with a transmission shaft, after the carbon sealing ring is abraded or the transmission shaft is abraded, a gap exists between the carbon sealing ring and the transmission shaft, so that sealing leakage is caused, dust particles enter the sealing ring to increase leakage and abrasion, the sealing effect is finally lost, dust flies upward, sealing air leaks, the environment is polluted, and the sealing air quantity is wasted to cause energy waste; need demolish the ring flange after shutting down when changing the smart sealing ring of charcoal, the degree of difficulty is great, and the time spent is longer, influences the production progress.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a coal pulverizer frame sealing device can improve sealed effect, reduces the maintenance and shuts down the frequency.
In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:
in a first aspect, a coal mill stand sealing device is provided for mounting on a drive shaft extending out of the coal mill stand, comprising: the first-stage sealing assembly and the second-stage sealing assembly are sleeved on the transmission shaft through fastening assemblies to form second-stage sealing; the coal mill base is provided with a first-stage sealing assembly, a second-stage sealing assembly and a coal pulverizer base, wherein the first-stage sealing assembly is a floating seal, the second-stage sealing assembly is a static seal, the first-stage sealing assembly is tightly attached to the coal pulverizer base, and the second-stage sealing assembly is tightly attached to the outer side of the first-stage sealing assembly.
In a possible implementation manner of the first aspect, the primary sealing component is a carbon sealing ring.
In a possible implementation manner of the first aspect, the secondary sealing component is a wear-resistant rubber piece.
In a possible implementation manner of the first aspect, the secondary sealing assembly is a wear-resistant rubber strip, and the wear-resistant rubber strip is wound in a ring shape along the circumferential direction of the transmission shaft.
In a possible implementation manner of the first aspect, the secondary sealing component is a wear-resistant rubber ring and is directly sleeved on the transmission shaft.
In a possible implementation manner of the first aspect, the secondary sealing assembly includes a sealing portion axially extending into the gap of the primary sealing assembly, a sealing body for compressing the fastening assembly, and a mouth portion axially extending to the outside of the fastening assembly, and the sealing portion, the sealing body, and the mouth portion are sequentially connected and integrally formed.
In a possible implementation manner of the first aspect, the closing-in portion is provided with an elastic fastening member.
In a possible implementation manner of the first aspect, an annular chamber for containing dust is arranged on the inner side of the sealing body along the circumferential direction.
In a possible implementation manner of the first aspect, the sealing body is further provided with a cleaning opening communicated with the annular chamber, and the cleaning opening is provided with a plugging cover.
In a second aspect, an embodiment of the present invention provides a coal pulverizer, including a frame and a coal pulverizer frame sealing device.
The utility model provides a coal pulverizer frame sealing device's beneficial effect lies in: compared with the prior art, the utility model discloses coal pulverizer frame sealing device sets up one-level seal assembly and the second grade seal assembly on the transmission shaft, utilizes floating seal to realize one-level seal, and static seal carries out the second grade and seals, because floating seal's installation clearance will be greater than static seal's installation clearance, further seals the clearance between floating seal and the transmission shaft in floating seal's the outside, utilizes the second grade to seal to reach sealed effect, can prolong sealing device holistic life, reduce cost of maintenance; meanwhile, the static seal is arranged on the outer side and plays a role in protecting the floating seal, the service life of the first-level seal is prolonged, the static seal is convenient to replace and maintain on the outer side, the maintenance downtime can be shortened, and the influence on production is reduced.
The utility model provides a coal pulverizer owing to adopted foretell sealing device, therefore has foretell effect, no longer gives unnecessary details here.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sealing device for a coal mill base according to an embodiment of the present invention.
In the figure: 1. a drive shaft; 2. a primary seal assembly; 3. a first nut; 4. a secondary seal assembly; 41. A blocking cover; 42. an elastic fastener; 43. a closing-in part; 44. a seal body; 45. an annular chamber; 46. A sealing part; 8. a machine base.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects to be solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to illustrate the present invention in further detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
One embodiment of a mill stand sealing arrangement as shown in fig. 1, comprising a drive shaft 1 mounted to extend outside of the mill stand 8, comprises: the sealing device comprises a primary sealing component 2 and a secondary sealing component 4, wherein the primary sealing component 2 and the secondary sealing component 4 are sleeved on a transmission shaft 1 through fastening components to form secondary sealing; wherein, the primary seal assembly 2 is a floating seal, the secondary seal assembly 4 is a static seal, the primary seal assembly 2 is tightly attached to the coal mill base 8, and the secondary seal assembly 4 is tightly attached to the outer side of the primary seal assembly 2.
Compared with the prior art, the coal mill frame sealing device provided by the utility model has the advantages that the first-stage sealing component 2 and the second-stage sealing component 4 are arranged on the transmission shaft 1, the first-stage sealing is realized by utilizing the floating seal, the static seal is used for carrying out the second-stage sealing, because the installation clearance of the floating seal is larger than that of the static seal, the clearance between the floating seal and the transmission shaft 1 is further sealed outside the floating seal, and the combination of the two-stage sealing is utilized, so that the sealing effect is achieved, the service life of the whole sealing device can be prolonged, and the maintenance cost is reduced; meanwhile, the static seal is arranged on the outer side and plays a role in protecting the floating seal, the service life of the first-level seal is prolonged, and the static seal is convenient to replace and maintain on the outer side, so that the maintenance downtime can be shortened, and the influence on production is reduced.
As shown in fig. 1, the primary seal component 2 is a carbon seal ring. The sealed technique commonly used now is sealed because the operation maintenance is simple, and the leakproofness is good, obtains extensive application, and the sealed of the smart sealing ring of charcoal, this embodiment improves sealed effect through increasing the quiet seal of second grade outside the smart sealing ring of charcoal, reduces to reveal and wearing and tearing, and then can prolong the life of the smart sealing ring of charcoal, reduces and changes the frequency.
The fastening assembly in the embodiment is directly pressed and fixed by using the bolt and the flange plate of the original equipment. For example, press the ring flange in the outside of second grade seal assembly 4, directly utilize the bolt, compress tightly second grade seal assembly 4 and one-level seal assembly 2 on frame 8 can, the installation is simple and convenient, need not change former equipment, consequently use cost is low.
As shown in fig. 1, the above-described feature secondary seal assembly 4 is a wear-resistant rubber member. The wear-resistant rubber material has a good sealing effect, is low in price and convenient to replace, and can solve the problem of long time for replacement.
In this embodiment, as shown in fig. 1, the primary seal is a carbon sealing ring, the secondary seal is made of wear-resistant rubber, when the primary seal is fastened by the fastening component, the first nut 3 is arranged on the carbon sealing ring of the primary seal, the carbon sealing ring is compressed by the first nut 3, and the secondary seal component 4 is compressed by the second nut outside the flange plate on the inner side of the bolt.
In one embodiment of the above-mentioned secondary sealing component 4, as shown in fig. 1, the secondary sealing component 4 is a wear-resistant rubber strip, and the wear-resistant rubber strip is wound into a ring shape along the circumferential direction of the transmission shaft 1. This embodiment adopts strip wear-resisting rubber winding transmission shaft 1 to realize sealed, because 1 diameter of transmission shaft of coal pulverizer is great, generally is more than 1.5m, and the sealing ring of major diameter is difficult for making like this and stores, and it is also inconvenient to install, consequently directly utilizes strip wear-resisting rubber winding, and the kneck can adopt the ligature to fix.
As a variant, as shown in fig. 1, the secondary seal assembly 4 may be a wear-resistant rubber ring, which is directly fitted on the transmission shaft 1.
As another modified embodiment of the secondary seal assembly 4, as shown in fig. 1, the secondary seal assembly 4 includes a sealing portion 46 axially extending into the gap of the primary seal assembly 2, a sealing body 44 for compressing the fastening assembly, and a mouth portion 43 axially extending to the outside of the fastening assembly, and the sealing portion 46, the sealing body 44 and the mouth portion 43 are connected in sequence and integrally formed. The secondary sealing component 4 shields dust particles through the sealing part 46 and the closing part 43, and a better sealing effect is achieved. Wherein, the sealing body 44 is compressed between the carbon sealing ring and the flange plate and is fastened through bolts.
As a modified embodiment, referring to fig. 1, the sealing portion 46 is provided with an inclined surface so as to extend into a gap between the carbon sealing ring and the transmission shaft 1.
As another modified embodiment of the secondary seal assembly 4, as shown in fig. 1, the mouth portion 43 is provided with an elastic fastening member 42. Set up elastic fastener in second grade seal assembly's binding off portion, elastic fastener 42 tightens the binding off of second grade seal assembly 4 to keep certain elasticity, improve the sealed effect in binding off department, also improve the reliability of connecting. In this embodiment, the elastic fastening member may be a tension spring or an elastic rubber band.
As another modified embodiment of the secondary seal assembly 4, as shown in fig. 1, an annular chamber 45 for containing dust is provided inside the seal body 44 along the circumferential direction. The annular chamber 45 serves to store dust or pebble coal particles entering the interior from entering the bottom seal 46. In use, the interior of the annular chamber 45 may be removed for cleaning.
As another modified embodiment of the secondary seal assembly 4, as shown in fig. 1, the seal body 44 is further provided with a purge port communicating with the annular chamber 45, and the purge port is provided with a plugging cover 41. The cleaning opening is arranged, so that cleaning can be started periodically, and when cleaning is carried out, pebble coal particles accumulated in the annular cavity 45 can be swept and cleaned in time through internal sealing air; the cleaning port part can also be provided with sealing air which enters the sealing cavity of the base 8 to generate pressure, and the clearance between the upper sealing surface and the lower sealing surface of the base 8 and the transmission shaft 1 is smaller to generate larger sealing air pressure to form sealing, thereby improving the sealing effect.
An embodiment of the utility model provides a coal pulverizer, including the frame 8 with 8 sealing device of coal pulverizer frame. Due to the adoption of the sealing device, the sealing effect can be improved, the abrasion degree of the 46 sealing parts is delayed, the service life is prolonged, the shutdown maintenance frequency is reduced, the maintenance cost is reduced, the production efficiency is improved, meanwhile, due to the sealing device, only a sealing rubber ring needs to be additionally arranged on the original basis, the transformation cost is low, and better economic value can be brought to enterprises.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Coal pulverizer frame sealing device installs and extends to on the outer transmission shaft of coal pulverizer frame, its characterized in that includes: the first-stage sealing assembly and the second-stage sealing assembly are sleeved on the transmission shaft through fastening assemblies to form second-stage sealing; the coal mill base is provided with a first-stage sealing assembly, a second-stage sealing assembly and a coal pulverizer base, wherein the first-stage sealing assembly is a floating seal, the second-stage sealing assembly is a static seal, the first-stage sealing assembly is tightly attached to the coal pulverizer base, and the second-stage sealing assembly is tightly attached to the outer side of the first-stage sealing assembly.
2. The coal pulverizer stand sealing apparatus of claim 1, wherein the primary seal assembly is a carbon seal ring.
3. The coal pulverizer stand sealing apparatus of claim 1, wherein the secondary seal assembly is a wear resistant rubber piece.
4. The coal mill stand seal of claim 3, wherein the secondary seal assembly is a wear resistant rubber strip wound circumferentially around the drive shaft in a ring shape.
5. The coal mill stand seal of claim 3, wherein the secondary seal assembly is a wear resistant rubber ring that fits directly over the drive shaft.
6. The coal mill stand sealing arrangement of claim 3, wherein the secondary seal assembly includes a seal portion extending axially into the primary seal assembly gap, a seal body for compression of the fastening assembly, and a mouth portion extending axially outside the fastening assembly, the seal portion, the seal body, and the mouth portion being connected in series and integrally formed.
7. The coal pulverizer stand sealing arrangement of claim 6, wherein the mouth portion is provided with a resilient fastener.
8. The coal mill stand sealing arrangement of claim 6, wherein the sealing body is provided circumferentially inside with an annular chamber for containing dust.
9. The coal pulverizer stand sealing device of claim 8, wherein the seal body is further provided with a scavenge port in communication with the annular chamber, the scavenge port being provided with a blanking cap.
10. Coal mill, comprising a mill housing and a mill housing sealing device according to any of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120441669.XU CN215110491U (en) | 2021-03-01 | 2021-03-01 | Coal mill frame sealing device and coal mill |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120441669.XU CN215110491U (en) | 2021-03-01 | 2021-03-01 | Coal mill frame sealing device and coal mill |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215110491U true CN215110491U (en) | 2021-12-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120441669.XU Active CN215110491U (en) | 2021-03-01 | 2021-03-01 | Coal mill frame sealing device and coal mill |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215110491U (en) |
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2021
- 2021-03-01 CN CN202120441669.XU patent/CN215110491U/en active Active
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