CN221003772U - Sealing structure of positive pressure air shutoff device - Google Patents
Sealing structure of positive pressure air shutoff device Download PDFInfo
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- CN221003772U CN221003772U CN202322775633.7U CN202322775633U CN221003772U CN 221003772 U CN221003772 U CN 221003772U CN 202322775633 U CN202322775633 U CN 202322775633U CN 221003772 U CN221003772 U CN 221003772U
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- 238000007789 sealing Methods 0.000 title claims abstract description 356
- 239000000463 material Substances 0.000 claims description 41
- -1 polytetrafluoroethylene Polymers 0.000 claims description 17
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 17
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 17
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- 239000010935 stainless steel Substances 0.000 claims description 14
- 239000004519 grease Substances 0.000 claims description 4
- 230000001050 lubricating effect Effects 0.000 claims description 4
- 230000007423 decrease Effects 0.000 claims description 2
- 230000013011 mating Effects 0.000 claims 1
- 238000005299 abrasion Methods 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 9
- 239000012535 impurity Substances 0.000 description 32
- 239000000843 powder Substances 0.000 description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 11
- 238000007599 discharging Methods 0.000 description 9
- 238000012423 maintenance Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000002035 prolonged effect Effects 0.000 description 6
- 238000012856 packing Methods 0.000 description 5
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 210000004907 gland Anatomy 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 239000010963 304 stainless steel Substances 0.000 description 1
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The utility model provides a sealing structure of a positive pressure air shutoff device, which relates to a sealing structure, comprising a first sealing area, a second sealing area and an air pressure sealing area positioned between the first sealing area and the second sealing area; the first sealing area comprises a first sealing element between the rotor and the shell, a second sealing element between the side end face of the rotor and the end cover, and a third sealing element between the end cover and the shell, the second sealing element is arranged at one end close to the first sealing element, and the second sealing area comprises a fourth sealing element between the shaft ends of the two sides of the rotor and the end cover, and a fifth sealing element arranged in the end cover; the utility model can ensure that the tightness of the whole structure is stronger, the abrasion of the sealing element is less, the service life is longer, the sealing element does not need to be frequently replaced, the matching position of the thin sealing strip in the shell is embedded into the wear-resistant nest, the wear-resistant and corrosion-resistant effects are realized, the replacement is convenient and cheap, the interference of the sealing element is small, the friction coefficient is low, and the influence on the load of a host computer is also lower.
Description
Technical Field
The utility model relates to a sealing structure, in particular to a sealing structure of a positive pressure air shutoff device.
Background
In the current aquatic feed production, a positive pressure density control system is adopted to produce sinking materials, a positive pressure air seal is required to be used in the positive pressure density control system, compressed air is introduced into the positive pressure air seal system during operation, so that a certain positive pressure (generally 0.1-0.2 Mpa) is kept in the whole system, namely, at the moment, the working area of the positive pressure air seal is also required to be kept at the working pressure of 0.1-0.2Mpa, the upper area of a rotor of the positive pressure air seal is known to be set as the working area, the pressure is kept at the working area of 0.1-0.2Mpa, the lower area of the rotor of the positive pressure air seal is set as the unloading area, the effect of the positive pressure air seal is that the materials are transported from the working area to the unloading area, and meanwhile, the pressure of the working area is kept;
however, in the actual production process of the feed, the production environment is worse, because more powder impurities are generated during production, the powder impurities easily enter gaps between the positive pressure air seal rotor and the shell, so that abrasion of the sealing element is accelerated, and the sealing property of the air seal is damaged, therefore, compared with the common air seal, the positive pressure air seal applied to the environment has higher requirements on the sealing property of the rotor, the integral structural strength and the service life of the sealing element;
in the prior art, the sealing against the air shutter mainly involves two positions, namely: a seal between the rotor and the housing and a seal between the rotor and the end cap;
Firstly, regarding the sealing between the rotor and the shell, the first part is the sealing between the rotor blade and the shell, the sealing is generally performed through a long sealing strip, mainly the choice of sealing strip materials is not described in the patent, the second part is the sealing between the short cylindrical surfaces on two sides of the rotor and the shell, the positive pressure air shutter in the industry is mainly performed by embedding integral sealing rings on two sides of the rotor and sealing the rotor through interference fit between the rotor and the shell, the sealing rings are large in size, and the contact area between the shell is large, so that the shell and the sealing rings are easy to generate large abrasion, the load of a speed reducer is easy to be too high, the sealing rings are integral sealing rings, the replacement cost is high, the shell is generally made of integral 304 stainless steel, the wear is not resistant, the shell is difficult to maintain once worn, and the maintenance cost is high;
In particular, it can be seen that a high airtight and wear-resistant air seal device (publication No. CN103538884 a) is disclosed, in which the two side seals of the rotor are sealed by an integral seal ring (i.e. the annular seal ring 6 made of steel plate material is mentioned in the patent), in addition, it is desirable to compensate the wear of the integral seal ring by an elastic seal ring (i.e. the annular seal ring 5 made of steel plate material), because the integral seal ring is made of metal material and is circular, it is impossible to be enlarged by the elastic seal ring and compensate the seal gap, in addition, according to the schematic diagram of fig. 3 in the patent, the integral seal ring is actually difficult to be installed in a matched manner, even if the integral seal ring is supposed to be installed, because the integral seal ring is affected by the machining precision and the assembly accumulated error, the integral seal ring and the shell are impossible to be just coaxial, so that after the assembly is completed, the gap is too small to generate interference, or the gap is too large to generate uneven seal gap to affect the seal effect, even if the machining cost is not considered, and even though the part precision is extremely high, a uniform tiny gap can be kept between the integral seal ring and the shell after assembly, and the integral seal ring is supposed to have the seal gap to be lost, and even though the seal effect is really achieved, and the whole seal gap is not damaged due to the whole seal material to be lost after the whole seal ring is considered to be broken;
Secondly, regarding the sealing between the rotor and the end cover, the first part is the sealing between the end faces at the two sides of the rotor and the end cover, the sealing between the end faces at the two sides of the rotor and the end cover is not concerned in the prior art, only the sealing between the short cylindrical surfaces at the two sides of the rotor and the shell is relied on, the second part is the sealing between the end faces at the two sides of the rotor and the end cover, the sealing is generally less reliable in the prior art, the packing gland is required to be regularly removed, the packing gland is more troublesome to replace, the sealing between the end faces at the two sides and the end cover can be referred to as a sealing air seal device (bulletin number is CN 106986190B), but only the sealing at the end faces at the two sides of the rotor is realized, the sealing performance of the whole air seal device cannot be guaranteed, namely, if the upper part of the air seal device rotor is a positive pressure working area, the lower part of the rotor is a discharging area, powder impurities can pass through a gap between the short cylindrical surfaces at the two sides of the rotor and the shell (corresponding to the sealing element of the working area of the utility model), then the gap between the short cylindrical surfaces at the two sides of the rotor and the end cover is more troublesome to replace the packing gland, the packing is also required to leak through the sealing between the sealing element of the short cylindrical surfaces at the two sides of the rotor and the end cover (corresponding to the sealing element of the sealing element is not really suitable for sealing the sealing between the sealing surface and the sealing between the sealing element and the sealing is really difficult to be achieved by the sealing and the sealing between the sealing is not really disclosed by itself because sealing is not really achieved.
Disclosure of utility model
In order to solve the technical problems, the utility model aims to provide the sealing structure of the positive pressure air shutoff device, which can ensure that the sealing performance of the whole structure is stronger, the abrasion of a sealing element is less, the service life is longer, the maintenance period is longer, frequent replacement is not needed, the fine sealing strip matching position in the shell is embedded into the abrasion-resistant nest, the abrasion-resistant and corrosion-resistant performances are realized, the replacement is convenient and cheap, the interference of the sealing element is small, the friction coefficient is low, and the influence on the load of a host computer is also lower.
The utility model provides the following technical scheme:
A sealing structure of a positive pressure air seal comprises a first sealing area, a second sealing area and an air pressure sealing area positioned between the first sealing area and the second sealing area;
The first sealing area comprises a first sealing element between the rotor and the shell, a second sealing element between the side end face of the rotor and the end cover, and a third sealing element between the end cover and the shell, and the second sealing element is arranged at one end close to the first sealing element, so that the overall sealing performance of the positive-pressure air shutter is ensured, because the positions of the first sealing element, the third sealing element and the subsequent second sealing area are all determined, and if the second sealing element is arranged close to the center of the rotor, even if the sealing performance of the second sealing element is good, gas in the working area of the rotor blade of the positive-pressure air shutter can leak from a space between the first sealing element and the second sealing element into a discharging area at the bottom;
The leakage can be seen from the leakage trend of the air seal device described in the background and the prior art, namely: in the known air seal device, the upper part of the rotor is a positive pressure working area, the lower part of the rotor is a discharging area, powder impurities can flow into the area between the rotor and the end cover through a gap between the short cylinders at two sides of the rotor in the working area (corresponding to one part of a sealing element in the working area of the utility model), and then leak into the lower discharging area through a gap between the short cylinders at two sides of the rotor and the housing (corresponding to one part of a sealing element in the discharging area of the utility model).
The second sealing area comprises a sealing piece IV between the shaft ends of the two sides of the rotor and the end cover and a sealing piece V arranged in the end cover;
An air adding hole is formed in the side face of the end cover, an air inlet connector is arranged on the air adding hole, compressed air is introduced between the end cover and the side end face of the rotor in the past, and the air pressure sealing area is formed by matching with the sealing performance of the first sealing area and the second sealing area, and the air pressure in the air pressure sealing area is greater than the working pressure of the working area of the rotor blade of the positive-pressure air seal device, so that water vapor and powder impurities are less likely to enter the first sealing area, and the overall sealing performance of the air seal device is improved;
In this case, the sealing performance of the first sealing area and the second sealing area is better, the air pressure sealing area can be formed, namely, the pressure which can be built at the first sealing area and the air consumption are reduced, ideally, if the sealing performance of the second sealing area is good enough, the air pressure sealing area and the second sealing area are unnecessary, the positive pressure air seal device is enough, and air leakage from the shaft ends is impossible, so that the bearing is influenced, but in practical application, the sealing area is just insufficient, because no air pressure sealing area forms blowback, material impurities can continuously enter the second sealing area, abrasion of the second sealing area is continuously increased, the sealing clearance is further increased, the air leakage is increased, and when the air pressure sealing area is arranged, the air leakage of the first sealing area and the second sealing area can be formed, so that the leakage of the material impurities is reduced, the tiny clearance between the first sealing area and the second sealing area can be kept, the mutual friction between the first sealing area and the second sealing area can be reduced, the service life of the first sealing area and the second sealing area can be replaced, and the first sealing area and the second sealing area can not be replaced.
Preferably, the first sealing element comprises a plurality of sealing grooves which are arranged on the short cylindrical surfaces at two sides of the rotor and are distributed side by side at intervals, and a fine sealing strip which is arranged in the sealing grooves, wherein the fine sealing strip is made of modified polytetrafluoroethylene material, wear-resistant nesting is arranged at two sides of the shell, and the fine sealing strip and the wear-resistant nesting are sealed through interference fit;
It follows that the sealing element is realized by the following steps: the seal between the short cylindrical surface on two sides of the rotor and the shell can be particularly sealed by adopting three circles of fine seal strips, the three circles of fine seal strips are arranged at intervals and in interference fit with the shell, the whole interference is small, the influence on the load of the speed reducer is small, the fine seal strips are made of modified polytetrafluoroethylene, the wear resistance and the friction coefficient are low, the fine seal strips are formed by winding after being cut by a long seal strip, the replacement is convenient, the cost is low, in addition, the wear-resistant nesting is embedded in the matching position of the fine seal strips in the shell, the wear-resistant nesting is made of stainless steel materials and adopts hardening treatment, the wear-resistant and corrosion-resistant effects are realized, and the wear-resistant nesting is more convenient and cheaper than the wear-resistant nesting which is too high in maintenance or maintenance cost after the whole shell is worn.
Preferably, the sealing member comprises a labyrinth seal A fixedly installed on the end cover through a countersunk head screw and a labyrinth seal B fixedly installed on the side end surface of the rotor through a cylindrical head screw, the labyrinth seal A and the labyrinth seal B are arranged in a matched mode to form a first labyrinth seal between the side end surface of the rotor and the end cover, the labyrinth seal A is made of modified polytetrafluoroethylene materials, and the labyrinth seal B is made of hardened stainless steel materials;
In summary, the sealing between the end faces at two sides of the rotor and the end cover can be formed, compared with neglecting the sealing at the position in the industry, the labyrinth sealing scheme is added at the position, so that the overall sealing performance can be increased, the defect of the sealing performance between the short cylindrical surfaces at two sides of the rotor and the shell is overcome, more powder impurities can be generated in actual feed production, the sealing gap can be filled to form a material seal after the powder impurities enter the labyrinth sealing, the sealing performance is better, one of the two paired labyrinth sealing rings is made of stainless steel materials and adopts hardening treatment, the other labyrinth sealing ring is made of modified polytetrafluoroethylene materials, the wear resistance and the friction coefficient are low, and the driving load is reduced.
Preferably, the sealing element III comprises an O-shaped ring arranged between the end cover and the shell, so that static sealing can be achieved between the end cover and the shell through the O-shaped ring, the end cover and the shell are positioned through a spigot, the installation is convenient, the radial runout of a rotor shaft can be effectively reduced by matching with the dimensional tolerance of parts processed with high precision, and the tightness and the service life of the framework oil seal in the second sealing area are greatly ensured.
Preferably, the sealing piece IV comprises a labyrinth sealing ring C made of modified polytetrafluoroethylene materials and a labyrinth sealing ring D made of hardened stainless steel materials, the labyrinth sealing ring C is fixed on the rotor shaft through a set screw, the labyrinth sealing ring D is fixed on the end cover through a countersunk head screw II, and the labyrinth sealing ring C and the labyrinth sealing ring D are paired to form a second labyrinth seal.
Preferably, the fifth sealing element comprises two skeleton oil seals arranged in the end cover, the skeleton oil seals are used as final sealing, and the two skeleton oil seals are matched with a rotor rotating at a low speed, so that the shaft end of the whole air seal device can be ensured not to leak water vapor and powder impurities, and frequent maintenance is not needed;
The labyrinth seal is adopted in the second sealing area, so that the labyrinth seal prevents possible powder impurities from forming a material seal again, the overall sealing performance of the air seal device is improved, meanwhile, the severe sealing working condition of the back skeleton oil seal is reduced, the sealing life of the back skeleton oil seal is prolonged, one of the two paired labyrinth seals is made of stainless steel materials and adopts hardening treatment, the other labyrinth seal is wear-resistant and corrosion-resistant, and is made of modified polytetrafluoroethylene materials, and the friction coefficient is low, so that the driving load is reduced, the two skeleton oil seals are used as the last sealing, no water vapor and powder impurities leak out from the air seal device, and the reduction of the overall sealing performance of the air seal device and the influence on a bearing are avoided;
And the end cover and the shell are positioned through the spigot, and the radial runout of the rotor shaft can be effectively reduced by matching with the dimensional tolerance of parts processed with high precision, so that the tightness and the service life of the framework oil seal are greatly ensured.
Preferably, the fit sealing clearance of the second labyrinth seal in the diameter direction gradually decreases from outside to inside, so that the sealing effect can be better.
Preferably, the end cover is further provided with an oil duct, an oil filling nozzle is arranged at an oil duct port, lubricating grease added by the oil filling nozzle is used for filling a gap between the framework oil seal and the second labyrinth seal, and the sealing performance of the framework oil seal and the second labyrinth seal are matched to form a sealing area at the gap, external water vapor and powder impurities cannot easily enter the sealing area, lubrication and no impurities are kept in the sealing area, abrasion of a sealing element is reduced, the service life is prolonged, friction resistance is reduced, and driving load is reduced.
The beneficial effects of the utility model are as follows:
1. The first sealing area is internally provided with the sealing piece which is used for realizing the sealing between the short cylindrical surfaces at two sides of the rotor and the shell, and is sealed by adopting three circles of fine seal strips in an interference fit manner, so that the rotor is convenient to replace, low in cost, small in integral interference and friction coefficient, small in influence on the load of the speed reducer, wear-resistant and corrosion-resistant, and convenient to replace, and low in cost;
2. The first labyrinth seal between the two sides of the rotor and the end cover is also arranged in the first sealing area, the tightness is increased by forming a material seal, the main sealing area of the positive pressure air shutoff device is formed by matching with the air pressure sealing area, one of the two labyrinth seals of the first labyrinth seal is made of hardened stainless steel, is wear-resistant and corrosion-resistant, and the other labyrinth seal is made of modified polytetrafluoroethylene, and is wear-resistant and low in friction coefficient;
3. The sealing between the end cover and the inner rotor shaft in the second sealing area adopts a sealing scheme of a second labyrinth seal and a framework oil seal, the second labyrinth seal prevents powder impurities again and forms a material seal, the framework oil seal is used as a final seal to thoroughly prevent the possibility of water vapor and powder impurities from leaking, meanwhile, lubricating grease is added in the second sealing area, a sealing area is formed in the second labyrinth seal and the framework oil seal, the tightness of the second sealing area can be improved, the abrasion of a sealing piece can be reduced, the service life of the sealing piece is prolonged, one of the two labyrinth sealing rings in the second sealing area adopts hardened stainless steel, the other labyrinth sealing ring is wear-resistant and corrosion-resistant, and the other labyrinth sealing ring adopts modified polytetrafluoroethylene, and is wear-resistant and low in friction coefficient;
4. Through the air entrainment hole of end cover side, let in compressed air between end cover and the rotor terminal surface, cooperate first sealing area and second sealing area to form the atmospheric pressure sealing area in this department, this sealing area internal pressure is greater than the operating pressure in the positive pressure air seal ware rotor blade, then can make steam, powder impurity be difficult to leak out more.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate the utility model and together with the embodiments of the utility model, serve to explain the utility model. In the drawings:
FIG. 1 is a schematic view of the three-dimensional structure of the whole of the air shutter of the present utility model (with the drive part removed);
FIG. 2 is a cross-sectional elevation of the air shutter of FIG. 1;
FIG. 3 is a cross-sectional view of the top structure of the air shutter of FIG. 1;
FIG. 4 is a schematic view of the structure of the air shutter rotor according to the present utility model;
FIG. 5 is an enlarged partial view of portion A of FIG. 2;
FIG. 6 is an enlarged partial view of portion B of FIG. 2;
FIG. 7 is an enlarged partial view of portion C of FIG. 3;
The labels in the figure:
1. A rotor; 101. a rotor shaft; 102. a rotor side end face; 103. rotor side short cylindrical surface; 2. a housing; 3. an end cap; 4. a first sealing region; 401. a fine seal; 402. wear-resistant nesting; 403. a labyrinth seal ring A; 404. a labyrinth seal ring B; 405. an O-ring; 406. cylindrical head screw; 407. countersunk head screw I; 5. a second sealing region; 501. a labyrinth seal ring C; 502. a labyrinth seal D; 503. a framework oil seal; 504. a set screw; 505. countersunk head screw II; 506. a fueling nozzle; 507. an oil passage; 6. a pneumatic seal area; 7. an air inlet joint.
Detailed Description
As shown in fig. 1-7, a sealing structure of a positive pressure air shutter comprises a first sealing area 4, a second sealing area 5 and an air pressure sealing area 6 positioned between the first sealing area 4 and the second sealing area 5 in the embodiment;
The first sealing area 4 comprises a first sealing element between the rotor 1 and the shell 2, a second sealing element between the side end face of the rotor 1 and the end cover 3 and a third sealing element between the end cover 3 and the shell 2, and the second sealing element is arranged near one end of the first sealing element, so that the overall sealing performance of the positive-pressure air shutter is ensured, because the positions of the first sealing element, the third sealing element and the subsequent second sealing area 5 are all determined, and if the second sealing element is arranged near the center of the rotor 1, even if the sealing performance of the second sealing element is good, gas in the working area of the blade of the positive-pressure air shutter rotor 1 can leak from the space between the first sealing element and the second sealing element into a discharging area at the bottom;
The leakage can be seen from the leakage trend of the air seal device described in the background and the prior art, namely: the upper part of the rotor 1 of the known air seal device is a positive pressure working area, the lower part of the rotor 1 is a discharging area, powder impurities can be fleed to the area between the rotor 1 and the end cover 3 through a gap (corresponding to one sealing element of the working area) between the two sides of the rotor 1 and the shell 2 in the working area, and then leak to the lower discharging area through a gap (corresponding to one sealing element of the discharging area) between the two sides of the rotor 1 and the shell 2.
The second sealing area 5 comprises a fourth sealing element between the shaft ends of the two sides of the rotor 1 and the end cover 3 and a fifth sealing element arranged in the end cover 3;
An air adding hole is formed in the side face of the end cover 3, an air inlet joint 7 is arranged on the air adding hole, compressed air is introduced between the end cover 3 and the rotor side end face 102 in the past, and the air pressure sealing area 6 is formed by matching with the sealing performance of the first sealing area 4 and the second sealing area 5, the air pressure in the air pressure sealing area 6 is greater than the working pressure of the working area of the blade of the positive-pressure air seal rotor 1, so that water vapor and powder impurities are less likely to enter the first sealing area 4, and the overall sealing performance of the air seal is improved;
At this time, the better tightness of the first sealing area 4 and the second sealing area 5 can form the air pressure sealing area 6, namely the rising pressure which can be built at the place and the air consumption are reduced, ideally, if the tightness of the second sealing area 6 and the second sealing area 5 is good enough, the air pressure air seal is not necessary, so that the air leakage from the shaft ends is impossible to influence the bearing, but in practical application, the sealing area is just insufficient by the second sealing element, because no air pressure sealing area 6 forms blowback, the material impurities continuously enter the second sealing area, the abrasion of the second sealing element is continuously increased, the sealing clearance is further increased, the air leakage is increased, and when the air pressure sealing area 6 is arranged, the air leakage of the first sealing area can be formed, so that the leakage of the material impurities is reduced, the tiny clearance between the first sealing element and the second sealing element can be kept, the mutual friction of the first sealing element and the second sealing element can be reduced, so that the service life of the first sealing element and the second sealing element can be prolonged, and the first sealing area and the second sealing area can not be replaced.
The first sealing part comprises a plurality of sealing grooves which are arranged on the short cylindrical surfaces on two sides of the rotor 1 and are distributed at intervals side by side, and a fine sealing strip 401 which is arranged in the sealing grooves, wherein the fine sealing strip 401 is made of modified polytetrafluoroethylene material, wear-resistant nesting pieces 402 are arranged on two sides of the shell 2, and the fine sealing strip 401 and the wear-resistant nesting pieces 402 are sealed through interference fit;
It follows that the sealing element is realized by the following steps: the seal between the short cylindrical surfaces on two sides of the rotor 1 and the shell 2 can be specifically realized by adopting three circles of fine seal strips 401 for sealing, the three circles of fine seal strips 401 are arranged at intervals and in interference fit with the shell 2, the whole interference is small, the influence on the load of a speed reducer is small, the fine seal strips 401 are made of modified polytetrafluoroethylene, the wear resistance and the friction coefficient are low, the fine seal strips 401 are formed by winding after being cut by a long seal strip, the replacement is convenient, the cost is low, in addition, the wear-resistant nest 402 is embedded in the matching position of the fine seal strips 401 in the shell 2, the wear-resistant nest 402 is made of stainless steel materials and is hardened, the wear-resistant and corrosion-resistant, and the wear-resistant seal is replaceable, compared with the whole shell 2 which cannot be maintained or has too high maintenance cost, and the replacement of the wear-resistant nest 402 is more convenient and cheaper.
The second sealing part comprises a labyrinth seal A403 fixedly installed on the end cover 3 through a countersunk head screw I407 and a labyrinth seal B404 fixedly installed on the side end face of the rotor 1 through a cylindrical head screw 406, the labyrinth seal A403 and the labyrinth seal B404 are arranged in a pairing mode to form a first labyrinth seal between the side end face of the rotor 1 and the end cover 3, the labyrinth seal A403 is made of modified polytetrafluoroethylene materials, and the labyrinth seal B404 is made of hardened stainless steel materials;
In conclusion, the sealing between the end faces of the two sides of the rotor 1 and the end cover 3 can be formed, compared with neglecting the sealing at the position in the industry, the labyrinth sealing scheme is added, so that the overall sealing performance can be increased, the defect of the sealing performance between the short cylindrical surfaces of the two sides of the rotor 1 and the shell 2 is overcome, more powder impurities can be generated in actual feed production, the sealing gap can be filled to form a material seal after the powder impurities enter the labyrinth sealing, the sealing performance is better, one of the two paired labyrinth sealing rings is made of stainless steel materials and adopts hardening treatment, the labyrinth sealing ring is wear-resistant and corrosion-resistant, the other labyrinth sealing ring is made of modified polytetrafluoroethylene materials, the wear resistance and the friction coefficient are low, and the driving load is reduced.
The third sealing part comprises an O-shaped ring 405 arranged between the end cover 3 and the shell 2, so that static sealing can be achieved between the end cover 3 and the shell 2 through the O-shaped ring 405, the end cover 3 and the shell 2 are positioned through a spigot, the installation is convenient, the radial runout of the rotor shaft 101 can be effectively reduced by matching with the dimensional tolerance of parts processed with high precision, and the tightness and the service life of the inner framework oil seal 503 in the second sealing area 5 are greatly ensured.
The fourth sealing piece comprises a labyrinth sealing ring C501 made of modified polytetrafluoroethylene materials and a labyrinth sealing ring D502 made of hardened stainless steel materials, the labyrinth sealing ring C501 is fixed on the rotor shaft 101 through a set screw 504, the labyrinth sealing ring D502 is fixed on the end cover 3 through a countersunk head screw II 505, and the labyrinth sealing ring C501 and the labyrinth sealing ring D502 are paired to form a second labyrinth seal.
The sealing piece five comprises two framework oil seals 503 which are arranged in the end cover 3, the framework oil seals 503 are used as final sealing, and the two framework oil seals 503 are matched with the rotor 1 which rotates at a low speed, so that the shaft end of the whole air seal device can be ensured not to leak water vapor and powder impurities, and frequent maintenance is not needed;
The labyrinth seal is adopted in the second sealing area 5 and is combined with the framework oil seal 503, so that the labyrinth seal prevents possible powder impurities from forming a material seal again, the overall sealing performance of the air seal is improved, meanwhile, the severe sealing working condition of the later framework oil seal 503 is reduced, the sealing life of the later framework oil seal 503 is prolonged, one of the two paired labyrinth seals is made of stainless steel materials and is subjected to hardening treatment, the other labyrinth seal is made of modified polytetrafluoroethylene materials, the wear resistance and the friction coefficient are low, the driving load is reduced, the two framework oil seals 503 are used as the last sealing, no water vapor and powder impurities leak out from the air seal, and the reduction of the overall sealing performance of the air seal and the influence on a bearing are avoided;
And the end cover 3 and the shell 2 are positioned through the spigot, and the radial runout of the rotor shaft 101 can be effectively reduced by matching with the dimensional tolerance of parts processed with high precision, so that the tightness and the service life of the framework oil seal 503 are greatly ensured, and compared with the packing seal which needs to be frequently tightened and replaced, the utility model can basically realize maintenance-free at shaft end sealing positions at two sides of the rotor 1.
The fit sealing clearance of the second labyrinth seal in the diameter direction gradually reduces from outside to inside, so that the sealing effect is better.
The end cover 3 is also provided with an oil duct 507, an oil filling nozzle 506 is arranged at the port of the oil duct 507, lubricating grease added by the oil filling nozzle 506 is used for filling the gap between the framework oil seal 503 and the second labyrinth seal, and the sealing performance of the framework oil seal 503 and the second labyrinth seal are matched to form a sealing area at the gap, external water vapor and powder impurities cannot easily enter the sealing area, lubrication and no impurities are kept in the sealing area, so that the abrasion of sealing elements is reduced, the service life is prolonged, the friction resistance is reduced, and the driving load is reduced.
The working principle of the utility model is as follows:
When the positive pressure density control system works, the air seal device is firstly opened, and compressed air is added through the air inlet joint 7 to form the air pressure sealing area 6. At the moment, no water vapor, powder impurities and the like exist in the first sealing area 4, the second sealing area 5 and the air pressure sealing area 6, the sealing effect is good, and the air pressure sealing area 6 has no compressed air loss.
After a period of operation, the fine seal 401 in the first sealing area 4 is gradually worn, the sealing effect between the rotor side short cylindrical surface 103 and the shell 2 is weakened, but due to the dimensional tolerance of parts processed with high precision, the gap at the position is very small, at the moment, because the gas pressure in the gas pressure sealing area 6 is higher than the pressure of the working area of the rotor 1, compressed air in the gas pressure sealing area 6 can pass through the labyrinth seal in the first sealing area 4, then reversely flows into the rotor 1 of the air-stop device through the tiny gap between the rotor side short cylindrical surface 103 and the wear-resistant nest 402 in the first sealing area 4, most of the compressed air enters the working area of the rotor 1, the positive pressure density control system is helped to maintain the pressure build, a small part of the compressed air enters the bottom of the rotor 1 to leak to the unloading area, at the moment, the gas consumption of the gas pressure sealing area 6 is increased, but the leakage amount is acceptable, and the gas pressure sealing area 6 continues to maintain. At the same time, because the compressed air is reversely blown into the rotor, water vapor and powder impurities are not easy to enter the first sealing area 4. At this time, the whole seal of the air seal device is established, and the whole air consumption is only slightly larger. However, a small amount of powder impurities still enters the first sealing area 4, and gradually fills the labyrinth gap of the first sealing area 4 to form a seal, but as the rotor 1 and the end cover 3 are relatively rotated, the labyrinth gap cannot be completely filled, a tiny gap is gradually formed, and compared with the prior labyrinth gap, the sealing effect of the first sealing area 4 is greatly enhanced. Meanwhile, the flow passage gap is greatly reduced, the compressed air quantity of the air pressure sealing area 6 for the reverse flow of the rotor 1 through the first sealing area 4 is also greatly reduced, the air consumption of the air pressure sealing area 6 is greatly reduced, the whole seal of the air seal device is kept, and meanwhile, the whole air consumption is lower. The primary purpose of the second sealing zone 5 is to help establish and maintain the air pressure sealing zone 6 and to ensure that there is no potential for any leakage of moisture, powder impurities as a final barrier to the seal of the rotor shaft ends of the air-lock.
The foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present utility model has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (8)
1. The sealing structure of the positive pressure air sealer is characterized by comprising a first sealing area (4), a second sealing area (5) and an air pressure sealing area (6) positioned between the first sealing area (4) and the second sealing area (5); the first sealing area (4) comprises a first sealing element between the rotor (1) and the shell (2), a second sealing element between the side end face of the rotor (1) and the end cover (3) and a third sealing element between the end cover (3) and the shell (2), and the second sealing element is arranged at one end close to the first sealing element; the second sealing area (5) comprises a sealing piece IV between shaft ends at two sides of the rotor (1) and the end cover (3) and a sealing piece V arranged in the end cover (3); the air inlet connector is characterized in that an air inlet hole is formed in the side face of the end cover (3), an air inlet connector (7) is arranged on the air inlet hole, compressed air is introduced between the end cover (3) and the side end face (102) of the rotor in the past, the air inlet connector is matched with the tightness of the first sealing area (4) and the tightness of the second sealing area (5) to form the air pressure sealing area (6), and the air pressure in the air pressure sealing area (6) is greater than the working pressure of the working area of the blade of the positive-pressure air-seal rotor (1).
2. The sealing structure of the positive pressure air seal device according to claim 1, wherein the first sealing element comprises a plurality of sealing grooves which are arranged on the short cylindrical surfaces on two sides of the rotor (1) at intervals side by side and a fine sealing strip (401) which is arranged in the sealing grooves, the fine sealing strip (401) is made of modified polytetrafluoroethylene materials, wear-resistant nesting pieces (402) are arranged on two sides of the shell (2), and the fine sealing strip (401) and the wear-resistant nesting pieces (402) are sealed through interference fit.
3. The sealing structure of a positive pressure air seal according to claim 1, wherein the two sealing members comprise a labyrinth seal A (403) fixedly mounted on the end cover (3) through a countersunk head screw I (407) and a labyrinth seal B (404) fixedly mounted on the side end face of the rotor (1) through a cylindrical head screw (406), the labyrinth seal A (403) and the labyrinth seal B (404) are arranged in a matched mode to form a first labyrinth seal between the side end face of the rotor (1) and the end cover (3), the labyrinth seal A (403) is made of modified polytetrafluoroethylene materials, and the labyrinth seal B (404) is made of hardened stainless steel materials.
4. The sealing structure of a positive pressure air shutter according to claim 1, wherein the sealing member three comprises an O-ring (405) arranged between an end cover (3) and a housing (2), and is positioned between the end cover (3) and the housing (2) by a spigot.
5. The sealing structure of the positive pressure air seal device according to claim 1, wherein the sealing piece four comprises a labyrinth seal C (501) made of modified polytetrafluoroethylene materials and a labyrinth seal D (502) made of hardened stainless steel materials, the labyrinth seal C (501) is fixed on the rotor shaft (101) through a set screw (504), the labyrinth seal D (502) is fixed on the end cover (3) through a countersunk head screw two (505), and the labyrinth seal C (501) and the labyrinth seal D (502) are matched to form a second labyrinth seal.
6. The sealing structure of the positive pressure air seal according to claim 5, wherein the sealing member five comprises two skeleton oil seals (503) installed in the end cover (3).
7. The seal structure of a positive pressure air seal according to claim 5, wherein the mating seal gap of the second labyrinth seal in the diameter direction has a tendency to gradually decrease from outside to inside.
8. The sealing structure of the positive pressure air-seal device according to claim 6, wherein the end cover (3) is further provided with an oil duct (507) and an oil filling nozzle (506) is arranged at a port of the oil duct (507), the lubricating grease added by the oil filling nozzle (506) is used for filling a gap between the framework oil seal (503) and the second labyrinth seal, and a sealing area is formed at the gap in cooperation with the tightness of the second labyrinth seal and the framework oil seal (503).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322775633.7U CN221003772U (en) | 2023-10-16 | 2023-10-16 | Sealing structure of positive pressure air shutoff device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322775633.7U CN221003772U (en) | 2023-10-16 | 2023-10-16 | Sealing structure of positive pressure air shutoff device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221003772U true CN221003772U (en) | 2024-05-24 |
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ID=91087838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322775633.7U Active CN221003772U (en) | 2023-10-16 | 2023-10-16 | Sealing structure of positive pressure air shutoff device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221003772U (en) |
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2023
- 2023-10-16 CN CN202322775633.7U patent/CN221003772U/en active Active
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