CA1073370A - Bearings for rapping shaft for electrostatic precipitators - Google Patents
Bearings for rapping shaft for electrostatic precipitatorsInfo
- Publication number
- CA1073370A CA1073370A CA265,618A CA265618A CA1073370A CA 1073370 A CA1073370 A CA 1073370A CA 265618 A CA265618 A CA 265618A CA 1073370 A CA1073370 A CA 1073370A
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- bearings
- slots
- rapping
- combination
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
- B03C3/76—Cleaning the electrodes by using a mechanical vibrator, e.g. rapping gear ; by using impact
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/09—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces
- F16D1/093—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping
- F16D1/095—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping with clamping effected by ring contraction only
- F16D1/096—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with radial clamping due to axial loading of at least one pair of conical surfaces using one or more elastic segmented conical rings forming at least one of the conical surfaces, the rings being expanded or contracted to effect clamping with clamping effected by ring contraction only the ring or rings being located between the shaft and the hub
Abstract
ABSTRACT OF THE DISCLOSURE
Bearings for rapping shaft for electrostatic precipita-tors including two bearings supported by two elongated rod mem-bers and a bearing block for receiving the rod support members in nesting relationship thereon, the rapping shaft including a wear ring on the outer periphery thereof, the wear ring being detach-ably mounted to the shaft and disposed in contacting relationship with the bearings.
Bearings for rapping shaft for electrostatic precipita-tors including two bearings supported by two elongated rod mem-bers and a bearing block for receiving the rod support members in nesting relationship thereon, the rapping shaft including a wear ring on the outer periphery thereof, the wear ring being detach-ably mounted to the shaft and disposed in contacting relationship with the bearings.
Description
1ai7337~) The invention relates to rapping shaft drive means for electrostatic precipitators and :more particularly relates to the bearings for a rapping shaft for electrostatic precipitators which are supported by two elongated rod members and a bearing block for receiving the rod members in nesting relationship thereon.
Electrosta-tic precipitators are provided with discharge and collecting electrodes which attract particulate matter from contaminated air streams passing through the precipitators. Par-ticulate matter or dust which piles up on these electrodes must be removed by shaking or washing of these electrodes. ~ormally, the shaking is accomplished by vibrators or rapping devices. Gen-erally, such devices have a rotating shaft with tumbling hammers fixed thereto and each of the hammers strikes a rapping rod linked to one or more discharge or collecting electrodes so as to shake or vlbrate them. These rotating shafts are supported by bearings which are sub]ected to wear and tear during the rotation of the rotating shaft with the tumbling hammers affixed thereto.
Wear and tear of the bearings is generally due to the dust content in the gases to be cleaned wherein the dust or partic-ulate matter in the gas streams penetrate into the bearingsthereby producing wear and tear of the bearings as well as the shaft. In some operations chemical components in the gas stream attribute to corrosion of the bearings and shafts. ~nd, even fur-ther, in other operating environments, the temperature of the gases which are passing through the precipitator, which in some cases are in the neighborhood of 400C, and higher, adds to the wear and tear of these bearings and shafts. Thus, the atmosphere inside a precipitator together with the wear and tear from dust, as men-tioned previously, do not allow for proper lubrication of the bear-ings.
In present day operations, it is common to use dry slidebearings without lubrication whereby the bearing sleeves and the ~ :, 1~i73~7~
shaft have to be replaced after the wear and tear has reached a certain level. For example, French patent number 1,361,746 teaches dry bearings with a back rest whereby the supporting parts can be re-adjusted from time to time. ~Iowever, wear and tear of the shaft cannot be prevented by this type of bearing. Another French pat-ent, French patent number 1.449,S21, teaches a shaft resting on roller or ball bearings on which the inner rings of the bearings ~, are sliding upon two supporting bolts so that when the roller bearing and their supporting bolts are worn they can be replaced.
Howéver, this has not completely alleviated the problem. Firstly, dust continues to penetrate into the ball bearings until the ball cage is pushed to one side and finally jammed at the supporting frame of the bearings. Secondly, in conjunction with the penetra-tion of the dust, the outer ring of the ball bearing starts to dig a groove into the rapping shaft which after a while will have to be replaced.
In the present invention it is recognized that it is desirable to provide bearings for a rapper shaft of an electro-static precipitator. Furthermore, it is recognized that it is desirable to provide bearings for a rapping shaft having a substan-tially long life with a minimum amount of maintenance.
According to the present invention, a rapping shaft hav-ing a detachably mounted wear ring thereon turns upon two bearings whereby wear occurs between the bearings and the detachably mounted wear ring and not the rapping shaft.
More particularly, the present invention provides in com-bination with an electrostatic precipitator having a housing with a flow through inlet and a flow through outlet and a plurality of discharge and collecting electrodes therein, the housing including an opening therein with a rapping shaft extending therethrough, the rapping shaft being in communication with rapping means for the electrodes, a bearing assembly for the rapping shaft compris-, ``~` 1C~73~
ing two spaced bearings each supported by an elongated rod membermounted in spaced relation in a bearing block, the rapping shaft including a wear ring on the outer periphery thereof, the wear ring being detachably mounted to the shaft and di.sposed in con-tacting relationship with the bearings.
It is to be understood that the description of the ex-amples of the present invention given hereinafter are not by way of limitation, and various modifications within the scope of the present invention will occur to those skilled in the art upon reading the disclosure set forth hereinafter.
The invention will now be described with reference to ~ the accompanying drawings which show a preferred form thereof and : wherein:
Figure 1 is a sectional view illustrating the bearings for a rapping shaft of the present invention' Figure 2 is a side view partially in section taken along line 2-2 of Figure 1, and, Figure 3 is a schematic illustration of a portion of a typical electrostatic precipitator having conventional electrode rappers utilizing a preferred bearing assembly of the present in-vention as shown in Figure 1.
In the accompanying drawing, in Figure 1, a bearing as-sembly 50 of the present invention is shown, the bearing assembly 50 being provided with a shaft 1 upon which a hardened wear ring 3 having a circular outer surface and a tapering inner surface is fastened by means of a split taper sleeve 2, the split taper sleeve
Electrosta-tic precipitators are provided with discharge and collecting electrodes which attract particulate matter from contaminated air streams passing through the precipitators. Par-ticulate matter or dust which piles up on these electrodes must be removed by shaking or washing of these electrodes. ~ormally, the shaking is accomplished by vibrators or rapping devices. Gen-erally, such devices have a rotating shaft with tumbling hammers fixed thereto and each of the hammers strikes a rapping rod linked to one or more discharge or collecting electrodes so as to shake or vlbrate them. These rotating shafts are supported by bearings which are sub]ected to wear and tear during the rotation of the rotating shaft with the tumbling hammers affixed thereto.
Wear and tear of the bearings is generally due to the dust content in the gases to be cleaned wherein the dust or partic-ulate matter in the gas streams penetrate into the bearingsthereby producing wear and tear of the bearings as well as the shaft. In some operations chemical components in the gas stream attribute to corrosion of the bearings and shafts. ~nd, even fur-ther, in other operating environments, the temperature of the gases which are passing through the precipitator, which in some cases are in the neighborhood of 400C, and higher, adds to the wear and tear of these bearings and shafts. Thus, the atmosphere inside a precipitator together with the wear and tear from dust, as men-tioned previously, do not allow for proper lubrication of the bear-ings.
In present day operations, it is common to use dry slidebearings without lubrication whereby the bearing sleeves and the ~ :, 1~i73~7~
shaft have to be replaced after the wear and tear has reached a certain level. For example, French patent number 1,361,746 teaches dry bearings with a back rest whereby the supporting parts can be re-adjusted from time to time. ~Iowever, wear and tear of the shaft cannot be prevented by this type of bearing. Another French pat-ent, French patent number 1.449,S21, teaches a shaft resting on roller or ball bearings on which the inner rings of the bearings ~, are sliding upon two supporting bolts so that when the roller bearing and their supporting bolts are worn they can be replaced.
Howéver, this has not completely alleviated the problem. Firstly, dust continues to penetrate into the ball bearings until the ball cage is pushed to one side and finally jammed at the supporting frame of the bearings. Secondly, in conjunction with the penetra-tion of the dust, the outer ring of the ball bearing starts to dig a groove into the rapping shaft which after a while will have to be replaced.
In the present invention it is recognized that it is desirable to provide bearings for a rapper shaft of an electro-static precipitator. Furthermore, it is recognized that it is desirable to provide bearings for a rapping shaft having a substan-tially long life with a minimum amount of maintenance.
According to the present invention, a rapping shaft hav-ing a detachably mounted wear ring thereon turns upon two bearings whereby wear occurs between the bearings and the detachably mounted wear ring and not the rapping shaft.
More particularly, the present invention provides in com-bination with an electrostatic precipitator having a housing with a flow through inlet and a flow through outlet and a plurality of discharge and collecting electrodes therein, the housing including an opening therein with a rapping shaft extending therethrough, the rapping shaft being in communication with rapping means for the electrodes, a bearing assembly for the rapping shaft compris-, ``~` 1C~73~
ing two spaced bearings each supported by an elongated rod membermounted in spaced relation in a bearing block, the rapping shaft including a wear ring on the outer periphery thereof, the wear ring being detachably mounted to the shaft and di.sposed in con-tacting relationship with the bearings.
It is to be understood that the description of the ex-amples of the present invention given hereinafter are not by way of limitation, and various modifications within the scope of the present invention will occur to those skilled in the art upon reading the disclosure set forth hereinafter.
The invention will now be described with reference to ~ the accompanying drawings which show a preferred form thereof and : wherein:
Figure 1 is a sectional view illustrating the bearings for a rapping shaft of the present invention' Figure 2 is a side view partially in section taken along line 2-2 of Figure 1, and, Figure 3 is a schematic illustration of a portion of a typical electrostatic precipitator having conventional electrode rappers utilizing a preferred bearing assembly of the present in-vention as shown in Figure 1.
In the accompanying drawing, in Figure 1, a bearing as-sembly 50 of the present invention is shown, the bearing assembly 50 being provided with a shaft 1 upon which a hardened wear ring 3 having a circular outer surface and a tapering inner surface is fastened by means of a split taper sleeve 2, the split taper sleeve
2 being wedged between the outer surface of the shaft 1 and the inner surface of the wear ring 3. The split taper sleeve 2 and hardened wear ring 3 are further held in place by a threaded sleeve 9 and a locking washer 10, threaded sleeve 9 being disposed around the outer periphery of taper sleeve 2 with locking washer 10 being sandwiched between the sleeve 9 and the ring 3.
-3-,, .:,, .. ,: ' ' ' : .' ` ~7337~ .
The shaft 1 is illustrated as being hollow and may be a tube with a relatively thin wall thickness, but, it may also be solid. The hardened ring 3 rests and rolls upon rolls 4a and 4b which are turning on two rod members 5a and 5b, rolls 4a and 4b as well as rod members 5a and 5b being preferably of a har-dened material or having their surfaces hardened by any known surface hardening treatment. Rod members 5a and 5b are illus-trated as bQlts having two flat opposed sides with arcuate sec--tions disposed between the flat sides, the radius of curvature of the arcuate sections being approximately the same as the radius of curvature of the inner periphery of the rollers 4a and 4b.
A bearing block 6 with a U-shaped cradle is provided with a pair of rod member receiving means therein, the rod member receiving means being illustrated as slots 7a and 7b. Each of the vertically extending legs 8 of the U-shaped block 6, only one being shown in Figure 1, includes two slots 7a and 7b at the up-per extremity thereof, slot 7a being on one side of each leg and the slot 7b being on the opposite side of the leg. In a pre-ferred embodiment, it is noted that the slots extend in a down-ward and inwardly direction and the bolts 5a and 5b rest withinsaid slots. Further, slots 7 are in spaced alignment with op-posing slots 7 in the opposed vertically extending leg ~b so that the bolts 5a and 5b are in parallel. Slots 7a and 7b are gener-ally ,slightly larger than the bolts 5 received thereby so that the bolts 5 may be removed from the block 6 with very little dif-ficulty.
As wear and tear of the bolts 5 and rollers 4 reach an inoperable stage, in order to replace these worn parts of the bearing assembly, the shaft 1 is pushed up and lifted upon the opposite roll. For example, if roll 4b and bolt 5b are to be re-moved, the shaft 1 is pushed up and lifted upon the opposite roll, roll 4a, wherein the roll 4b together with the bolt 5b are removed `
' , ' ~ '',' "' ,' ' ~: ' 3~7337~
from the block 6 with the fingers. Further, if the bolt 5b has been damaged by wear and tear only on one side then the worn side is mechanically re-worked or turned down and the bolt with its roller reset into working position. When wear and tear of both the bolt and roller are beyond re-working, both parts may be re-placed by a new pair of bolts and rollers at a minimal cost.
Another advantage of the present invention is that since the rapping shaft is not subject to wear and tear, i-t is possible to use a tube with a relatively thin wall thickness.
Such a tube has the advantage of lighter weight compared to solid shafts and also reduces the friction in the bearings and as a consequence causes less wear and tear on the bearing assembly.
In Figure 3, there is illustrated one electrostatic pre-cipitator utilizing the bearing assembly as previously described and shown in Figures 1 and 2. As shown, an electrostatic precip-itator generally designated by the numeral 40 is provided with an outer shell 11 which directs a flow of particle-laden gases past a plurality of discharge electrodes 12 and a plurality of collector plates 13. The discharge electrodes are supported by structural members 14 which are themselves supported by support frame 30 and elongated support member 31. Hanger rod 15 is pro-vided to extend through insulator 16 which electrically isolates the hanger rod 15 from the motor housing shell 32, shell 11 and collector plate 13.
The hanger rod 15 extends downwardly and is attached to shaft 1. Shaft 1 includes a plurality of hammers 32 thereon and is supported by the bearing assembly 50, bearing assembly 50 being supported by support member 51. Support member 51 is gen-erally a channel-shaped member which rests upon elongated support member 31, support member 31 usually being a channel-shaped mem-ber which extends across the top of the housing 40.
The discharge electrodes 12 are supplied with high volt-_5_ 37~) age electric current by means of any conventional system (notshown) which are known in the art.
As the particle-laden gas passes through shell 11, the particles are charged in the ionization field between the dis-charge electrode wires 12 and collector plates 13. The charged particles migrate toward the flat surfaces of plates 13 and col-lect thereon. These collected particles must be removed period-ically to maintain efficient collection.
A rapping drive source 17 is connected to the hanger rod 15 so that vibrations generated from the rapping source are transmitted to the electrodes 12 through the structural members 14.
The collector plates 13 are supported by structural members 18 which are an integral part of shell 11. Plates 13 are also rapped by a rapping source 19 similar to source 17, connected to the electrodes 13 by a rod 20. Thus, when the rapping sources are energized, the electrodes are vibrated thereby dislodging ac-cumulated dust particles which fall into a hopper 21 from which they are periodically removed.
As viewed in Figure 3, the particle-laden gas is flow-ing between the lanes formed by collector plates 13 and away fromthe observer~ The lanes may be several feet long so that several hanger rods 15 may be positioned along the lanes, one behind the other. Rapping drive sources 17 will similarly be positioned.
It is realized that other changes may be made to the specific embodiment shown and described without departing from the principals and spirit of the present invention.
The shaft 1 is illustrated as being hollow and may be a tube with a relatively thin wall thickness, but, it may also be solid. The hardened ring 3 rests and rolls upon rolls 4a and 4b which are turning on two rod members 5a and 5b, rolls 4a and 4b as well as rod members 5a and 5b being preferably of a har-dened material or having their surfaces hardened by any known surface hardening treatment. Rod members 5a and 5b are illus-trated as bQlts having two flat opposed sides with arcuate sec--tions disposed between the flat sides, the radius of curvature of the arcuate sections being approximately the same as the radius of curvature of the inner periphery of the rollers 4a and 4b.
A bearing block 6 with a U-shaped cradle is provided with a pair of rod member receiving means therein, the rod member receiving means being illustrated as slots 7a and 7b. Each of the vertically extending legs 8 of the U-shaped block 6, only one being shown in Figure 1, includes two slots 7a and 7b at the up-per extremity thereof, slot 7a being on one side of each leg and the slot 7b being on the opposite side of the leg. In a pre-ferred embodiment, it is noted that the slots extend in a down-ward and inwardly direction and the bolts 5a and 5b rest withinsaid slots. Further, slots 7 are in spaced alignment with op-posing slots 7 in the opposed vertically extending leg ~b so that the bolts 5a and 5b are in parallel. Slots 7a and 7b are gener-ally ,slightly larger than the bolts 5 received thereby so that the bolts 5 may be removed from the block 6 with very little dif-ficulty.
As wear and tear of the bolts 5 and rollers 4 reach an inoperable stage, in order to replace these worn parts of the bearing assembly, the shaft 1 is pushed up and lifted upon the opposite roll. For example, if roll 4b and bolt 5b are to be re-moved, the shaft 1 is pushed up and lifted upon the opposite roll, roll 4a, wherein the roll 4b together with the bolt 5b are removed `
' , ' ~ '',' "' ,' ' ~: ' 3~7337~
from the block 6 with the fingers. Further, if the bolt 5b has been damaged by wear and tear only on one side then the worn side is mechanically re-worked or turned down and the bolt with its roller reset into working position. When wear and tear of both the bolt and roller are beyond re-working, both parts may be re-placed by a new pair of bolts and rollers at a minimal cost.
Another advantage of the present invention is that since the rapping shaft is not subject to wear and tear, i-t is possible to use a tube with a relatively thin wall thickness.
Such a tube has the advantage of lighter weight compared to solid shafts and also reduces the friction in the bearings and as a consequence causes less wear and tear on the bearing assembly.
In Figure 3, there is illustrated one electrostatic pre-cipitator utilizing the bearing assembly as previously described and shown in Figures 1 and 2. As shown, an electrostatic precip-itator generally designated by the numeral 40 is provided with an outer shell 11 which directs a flow of particle-laden gases past a plurality of discharge electrodes 12 and a plurality of collector plates 13. The discharge electrodes are supported by structural members 14 which are themselves supported by support frame 30 and elongated support member 31. Hanger rod 15 is pro-vided to extend through insulator 16 which electrically isolates the hanger rod 15 from the motor housing shell 32, shell 11 and collector plate 13.
The hanger rod 15 extends downwardly and is attached to shaft 1. Shaft 1 includes a plurality of hammers 32 thereon and is supported by the bearing assembly 50, bearing assembly 50 being supported by support member 51. Support member 51 is gen-erally a channel-shaped member which rests upon elongated support member 31, support member 31 usually being a channel-shaped mem-ber which extends across the top of the housing 40.
The discharge electrodes 12 are supplied with high volt-_5_ 37~) age electric current by means of any conventional system (notshown) which are known in the art.
As the particle-laden gas passes through shell 11, the particles are charged in the ionization field between the dis-charge electrode wires 12 and collector plates 13. The charged particles migrate toward the flat surfaces of plates 13 and col-lect thereon. These collected particles must be removed period-ically to maintain efficient collection.
A rapping drive source 17 is connected to the hanger rod 15 so that vibrations generated from the rapping source are transmitted to the electrodes 12 through the structural members 14.
The collector plates 13 are supported by structural members 18 which are an integral part of shell 11. Plates 13 are also rapped by a rapping source 19 similar to source 17, connected to the electrodes 13 by a rod 20. Thus, when the rapping sources are energized, the electrodes are vibrated thereby dislodging ac-cumulated dust particles which fall into a hopper 21 from which they are periodically removed.
As viewed in Figure 3, the particle-laden gas is flow-ing between the lanes formed by collector plates 13 and away fromthe observer~ The lanes may be several feet long so that several hanger rods 15 may be positioned along the lanes, one behind the other. Rapping drive sources 17 will similarly be positioned.
It is realized that other changes may be made to the specific embodiment shown and described without departing from the principals and spirit of the present invention.
Claims (7)
1. In combination with an electrostatic precipitator having a housing with a flow through inlet and a flow through outlet and a plurality of discharge and collecting electrodes therein, said housing including an opening therein with a rapping shaft extending therethrough, said rapping shaft being in communication with rapping means for said electrodes, a bearing assembly for said rapping shaft comprising: two spaced bearings each supported by an elongated rod member mounted in spaced relation in slots open at the top extending downwardly into a bearing block, the rapping shaft including a wear ring on the outer periphery thereof, the wear ring being detachably mounted to said shaft and disposed in contacting relationship with said bearings.
2, The combination of Claim 1 wherein said rod members are bolts having two flat opposed sides with arcuate sections disposed between said flat sides, the radius of curvature of said arcuate sections being approximately the same as the radius of curvature of the inner periphery of said bearings.
3. The combination of Claim 1 wherein said bearing block includes a U-shaped cradle with a pair of rod member receiving means therein, the rod member receiving means including slots in each of the vertically extending legs of the U-shaped cradle, said slots being in spaced alignment.
4. The combination of Claim 3, said slots being disposed at the upper extremity of said vertically extending legs, said slots being on opposite sides of said leg.
5. The combination of Claim 4, said slots extending in a downward and inwardly direction.
6. The combination of Claim 3, said slots being slightly larger than the rod members received thereby whereby said rod mem-bers may be removed with very little difficulty.
7. The combination of Claim 1, said wear ring having a circular outer surface and a tapering inner surface, said wear ring being attached to said rapping shaft by a split taper sleeve, said split taper sleeve being wedged between said wear ring and said shaft.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/654,088 US4059420A (en) | 1975-05-23 | 1976-02-02 | Bearings and rapping shaft in electrostatic precipitator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073370A true CA1073370A (en) | 1980-03-11 |
Family
ID=24623391
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA265,618A Expired CA1073370A (en) | 1976-02-02 | 1976-11-15 | Bearings for rapping shaft for electrostatic precipitators |
Country Status (10)
| Country | Link |
|---|---|
| CA (1) | CA1073370A (en) |
| CH (1) | CH604903A5 (en) |
| DE (1) | DE2703124A1 (en) |
| ES (1) | ES453884A1 (en) |
| FI (1) | FI770124A (en) |
| FR (1) | FR2339435A2 (en) |
| GB (1) | GB1572735A (en) |
| IT (1) | IT1064298B (en) |
| SE (1) | SE7612223L (en) |
| YU (1) | YU17377A (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB390100A (en) * | 1932-11-05 | 1933-03-30 | Timken Roller Bearing Co | Improvements relating to bearings for rolls, such as paper dryer rolls |
| DE1929531U (en) * | 1965-08-09 | 1965-12-23 | Elex Ag | BEARING FOR POT SHAFTS IN ELECTRIC FILTERS. |
| US3483669A (en) * | 1965-09-13 | 1969-12-16 | Koppers Co Inc | Dust dislodging system for electrostatic precipitators |
| FR1476967A (en) * | 1966-04-20 | 1967-04-14 | Koppers Co Inc | Improvements to precipitators or electrostatic precipitators and to processes for cleaning electrodes |
| US3920085A (en) * | 1974-11-11 | 1975-11-18 | Universal Oil Prod Co | Swing hammer rapping system for electrostatic precipitator |
-
1976
- 1976-11-03 SE SE7612223A patent/SE7612223L/en unknown
- 1976-11-15 CA CA265,618A patent/CA1073370A/en not_active Expired
- 1976-11-17 IT IT29448/76A patent/IT1064298B/en active
- 1976-12-02 ES ES453884A patent/ES453884A1/en not_active Expired
-
1977
- 1977-01-06 FR FR7700290A patent/FR2339435A2/en active Pending
- 1977-01-12 GB GB1188/77A patent/GB1572735A/en not_active Expired
- 1977-01-17 FI FI770124A patent/FI770124A/fi not_active Application Discontinuation
- 1977-01-24 YU YU00173/77A patent/YU17377A/en unknown
- 1977-01-26 DE DE19772703124 patent/DE2703124A1/en not_active Ceased
- 1977-01-31 CH CH114777A patent/CH604903A5/xx not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| FI770124A (en) | 1977-08-03 |
| YU17377A (en) | 1982-05-31 |
| ES453884A1 (en) | 1977-11-16 |
| GB1572735A (en) | 1980-08-06 |
| SE7612223L (en) | 1977-08-03 |
| CH604903A5 (en) | 1978-09-15 |
| IT1064298B (en) | 1985-02-18 |
| DE2703124A1 (en) | 1977-08-04 |
| FR2339435A2 (en) | 1977-08-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |