EP0396944A1 - Appareil pour impulsion d'air avec une unité à soupape et un piston guidé à l'intérieur - Google Patents

Appareil pour impulsion d'air avec une unité à soupape et un piston guidé à l'intérieur Download PDF

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Publication number
EP0396944A1
EP0396944A1 EP90107389A EP90107389A EP0396944A1 EP 0396944 A1 EP0396944 A1 EP 0396944A1 EP 90107389 A EP90107389 A EP 90107389A EP 90107389 A EP90107389 A EP 90107389A EP 0396944 A1 EP0396944 A1 EP 0396944A1
Authority
EP
European Patent Office
Prior art keywords
piston
outlet pipe
air outlet
sealing
air blast
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.)
Granted
Application number
EP90107389A
Other languages
German (de)
English (en)
Other versions
EP0396944B1 (fr
Inventor
Udo Leibling
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agrichema Materialflusstechnik GmbH
Original Assignee
Agrichema Materialflusstechnik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Agrichema Materialflusstechnik GmbH filed Critical Agrichema Materialflusstechnik GmbH
Priority to AT90107389T priority Critical patent/ATE87584T1/de
Publication of EP0396944A1 publication Critical patent/EP0396944A1/fr
Application granted granted Critical
Publication of EP0396944B1 publication Critical patent/EP0396944B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D88/00—Large containers
    • B65D88/54—Large containers characterised by means facilitating filling or emptying
    • B65D88/64—Large containers characterised by means facilitating filling or emptying preventing bridge formation
    • B65D88/70—Large containers characterised by means facilitating filling or emptying preventing bridge formation using fluid jets
    • B65D88/703—Air blowing devices, i.e. devices for the sudden introduction of compressed air into the container

Definitions

  • the invention relates to an air blast device according to the preamble of claim 1.
  • Air blast devices are used to remove material caking or build-up of powdery bulk goods in bunkers, silos and the like. They include a large-volume storage container for receiving the compressed air, an air outlet pipe and a valve unit placed on the air outlet pipe and arranged inside the compressed air tank. The air blast is generated by lifting the piston of the valve unit, so that the compressed air received in the storage container can suddenly escape to the outside through the opening of the air outlet pipe released by the piston.
  • the piston of the valve unit is constructed in mirror image from two piston disks, and the stop surfaces of the cylinder are designed so that they do not overlap. If there are signs of wear on the piston disks in the course of time, these can be rotated so that the piston can practically be used again for the same period of time.
  • Air blast devices of this type are often also used in the hot area, for example in connection with heat exchangers, where temperatures can reach up to 1200 ° C., so that the outer surface of the piston of the valve unit opposite the air outlet pipe can be exposed to considerable temperatures via the air outlet pipe.
  • the valve unit, in particular the piston is naturally exposed to additional stresses and strains, which in particular can lead to rapid signs of wear, which can lead to an inaccurate seating of the piston disc on the air outlet pipe and thus to leaks.
  • the object of the invention is to provide an air blast device with a valve unit in which a long-term use of the valve unit in the hot area, in particular at temperatures up to 400 ° C. and above, is made possible by simple design of the piston.
  • the piston structure should be kept simple and robust and the piston should be inexpensive to manufacture.
  • the piston disc facing the air outlet tube is provided on its outer surface with a heat-resistant, disc-like sealing plate which has a sealing disc which is arranged at least in overlap or overlap with the annular end face of the air outlet tube facing the piston.
  • the sealing shield is formed by a large-area sealing disk which covers the entire air outlet pipe on the end face and is formed from heat-resistant material. This sealing washer thus fulfills a sealing function in the region of the end face of the air outlet pipe and protects the piston washer from high-temperature stresses, such as direct embers or radiant heat and the like, from the air outlet pipe.
  • the pane also has sealing properties in addition to the heat protection, an effective seal of the valve unit with respect to the air outlet pipe is achieved.
  • This is also achieved according to a further embodiment, which is distinguished by a particularly long service life, in particular with regard to the sealing properties, and has a sealing disk covering the air outlet tube and an insulating disk made of heat-resistant material arranged on the sealing disk, which preferably essentially covers the entire opening cross section of the air outlet pipe covered.
  • a sealing plate enables the material for the piston disks, in particular the piston disk closest to the air outlet pipe, to be selected without taking thermal resistance properties into account, so that polyurethane foam or preferably aluminum is readily used as the material for the piston disks can be used. This enables inexpensive production. At the same time, these materials are better suited for the piston function due to their different properties.
  • the sealing washer is made of heat-resistant material
  • the sealing washer is expediently formed from plastic, fluororubber or metal-ceramic material, fiber reinforcement possibly being appropriate.
  • a hard fiber material is also suitable here.
  • the sealing washer is expediently made of fluororubber, a material commercially available under the Viton trademark or a material commercially available under the Teflon trademark, and the insulating washer is expediently made of asbestos or asbestos-containing hard fiber material or also of asbestos-free Hard fiber material or a ceramic disc made.
  • the sealing plate is expediently attached to the piston disk by means of a screw which can also serve to connect the two piston disks. This enables a detachable connection of the piston disks.
  • the sealing shield has a particularly advantageous effect here because, due to the sealing function, protection in the area of the screw against heat stress is also guaranteed. As a result of the pressure on the sealing shield, in particular the sealing washer, there is a seamless bond between the sealing shield and the screw shaft as a result of local deformation. A particularly effective contact pressure is achieved via a holder disk, which is expediently made of steel.
  • the inside of the piston disk is provided with a recess which can also serve to hold a cooling medium and thus to cool the piston disk contributes. It is expedient here to connect the recess to the outside of the piston via breathing bores which run radially in the piston disk. In a further expedient embodiment, a cutout is also provided on the other piston disk. If the piston disks are separated by a spacer, both recesses can be connected to one another by bores that run in the axial direction of the piston.
  • the piston in a spatula-like manner, that is to say also to provide the sealing shield on the opposite piston disk, which faces away from the air outlet pipe.
  • the piston can be changed if necessary, so that the piston disk, which has not been exposed to high temperatures so far, is then arranged directly opposite the air outlet pipe. This can further increase the life of the piston.
  • FIGS. 1 and 2 each show a section through a cylinder of a valve unit of an air blast device.
  • 1 generally designates the valve unit of an air blast device which has a storage container for compressed air (not shown) and the valve unit 1 with an air outlet pipe 2.
  • the valve unit 1 comprises a cylinder 3, which, at its lower section facing the air outlet pipe 2, preferably has three openings 4 distributed over the circumference, which connect the interior of the storage container with that of the cylinder 3.
  • the air blast is accomplished in that the piston 5, which is reciprocally guided in the cylinder 3, is lifted upward from the mouth of the air outlet pipe 2, as a result of which the air suddenly comes out of the interior of the storage container through the openings 4 through the air outlet pipe 2 .
  • the piston 5 in the illustrated embodiment comprises two piston disks 7 and 8 separated by a spacer or a spacer 6, which are releasably connected to one another by a screw 9. If necessary, the spacer 6 can also be omitted and thus also one of the two sealing elements 17 and 18.
  • the piston disk 8 facing the air outlet pipe 2 is provided on its outside, that is to say the side facing the air outlet pipe 2, with a sealing plate 10 with a sealing disk 101, which at least covers the entire area of the air outlet pipe 2 including the opening cross section, so that through the sealing disk 101, which is formed from a highly heat-resistant material, the piston disk 8 arranged behind it is protected against high temperatures.
  • the sealing disk 101 develops its sealing function. The action of the high temperatures takes place via the air outlet pipe 2, at the end of which a hot fire nozzle can be arranged or formed.
  • the sealing disk 101 is arranged centrally on the piston disk 8 and in the embodiment shown in a recess 11.
  • the sealing plate 10 is pressed firmly against the piston disc 8 by a large-area retaining disc 12 via the screw 9.
  • a recess 11 on the piston disk 8 can also be dispensed with and the sealing disk 101 rests on the flat surface of the piston disk. This also applies to the embodiment according to FIG. 2.
  • the piston disc 8 is formed on its inside with a recess 13 which serves on the one hand to reduce weight and on the other hand can also be used as a cooling capacity.
  • the recess 13 is connected to the outer surface of the piston disc 8 via bores 14 which run radially, so that the recess tion 13 can be supplied with air for cooling.
  • an analog recess can also be provided on the piston disc 7, in particular on the inside thereof, which is connected to the recess 13 through bores 15 running in the axial direction of the piston or the screws 9 through the spacer.
  • the bore 15 and the further cutout 16 in the piston disk 7 are drawn in with dashed lines in the figure for the purpose of illustration.
  • the spacer 6 has sealing elements in the form of sealing rings 17 and 18.
  • the non-positive connection via the screw 9 is introduced to the upper piston plate 7 via a further holding plate 19 corresponding to the holding plate 12.
  • the upper stop surface of the cylinder is provided with the reference numeral 20 and the lower stop surface is formed by the front end 23 of the air outlet pipe 2.
  • the embodiment of FIG. 2 differs from the embodiment of FIG. 1 only by the structure of the sealing plate 10.
  • the sealing plate 10 comprises a sealing washer 101, which in the illustrated embodiment covers the opening cross section of the air outlet pipe, at least in the area of coverage with the end face 23 of the air outlet pipe 2 is arranged, namely directly on the outside of the piston disc 8.
  • an insulating washer 102 is arranged, which extends essentially over the entire opening cross section of the air outlet pipe 2 and on the outside of which a holding washer 12 made of steel is arranged analogously to the embodiment according to FIG. 1.
  • the bond is also achieved by frictional engagement via a screw 9.
  • the heat protection can be increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compressor (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
EP90107389A 1989-05-10 1990-04-19 Appareil pour impulsion d'air avec une unité à soupape et un piston guidé à l'intérieur Expired - Lifetime EP0396944B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90107389T ATE87584T1 (de) 1989-05-10 1990-04-19 Luftstossgeraet mit einer ventileinheit und einem darin gefuehrten kolben.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3915295 1989-05-10
DE3915295 1989-05-10
DE3917910A DE3917910A1 (de) 1989-05-10 1989-06-01 Luftstossgeraet mit einer ventileinheit und einem darin gefuehrten kolben
DE3917910 1989-06-01

Publications (2)

Publication Number Publication Date
EP0396944A1 true EP0396944A1 (fr) 1990-11-14
EP0396944B1 EP0396944B1 (fr) 1993-03-31

Family

ID=25880744

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90107389A Expired - Lifetime EP0396944B1 (fr) 1989-05-10 1990-04-19 Appareil pour impulsion d'air avec une unité à soupape et un piston guidé à l'intérieur

Country Status (2)

Country Link
EP (1) EP0396944B1 (fr)
DE (2) DE3917910A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111014196A (zh) * 2019-12-25 2020-04-17 中国海洋石油集团有限公司 一种管道连续爆破吹扫装置及其爆破吹扫方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9408944U1 (de) * 1994-06-01 1994-09-08 OLREN Instrumente Erich Leibinger, 78603 Renquishausen Sandaufwirbelungsvorrichtung für Sandstrahlgeräte
ITBG20010037A1 (it) * 2001-10-19 2003-04-19 Larix Srl Valvola di sparo o scarico istantaneo di grande portate di aereiformi, per fluidificazione di materiali granulari e/o polverulenti.

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3641529A1 (de) * 1985-12-11 1987-06-19 Vasipari Es Gepjarmuejavito Sz Vorrichtung zum schlagartigen einblasen von druckluft in einen schuettgut enthaltenden behaelter
DE3151026C2 (fr) * 1981-12-23 1988-08-18 Agrichema Materialflusstechnik Gmbh, 6501 Budenheim, De

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3151026C2 (fr) * 1981-12-23 1988-08-18 Agrichema Materialflusstechnik Gmbh, 6501 Budenheim, De
DE3641529A1 (de) * 1985-12-11 1987-06-19 Vasipari Es Gepjarmuejavito Sz Vorrichtung zum schlagartigen einblasen von druckluft in einen schuettgut enthaltenden behaelter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111014196A (zh) * 2019-12-25 2020-04-17 中国海洋石油集团有限公司 一种管道连续爆破吹扫装置及其爆破吹扫方法

Also Published As

Publication number Publication date
EP0396944B1 (fr) 1993-03-31
DE59001098D1 (de) 1993-05-06
DE3917910A1 (de) 1990-11-15

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