WO1996036267A1 - Arrangement in a suction system for solid materials - Google Patents

Arrangement in a suction system for solid materials Download PDF

Info

Publication number
WO1996036267A1
WO1996036267A1 PCT/FI1996/000271 FI9600271W WO9636267A1 WO 1996036267 A1 WO1996036267 A1 WO 1996036267A1 FI 9600271 W FI9600271 W FI 9600271W WO 9636267 A1 WO9636267 A1 WO 9636267A1
Authority
WO
WIPO (PCT)
Prior art keywords
suction
valve
trunk
arrangement according
tubing
Prior art date
Application number
PCT/FI1996/000271
Other languages
French (fr)
Inventor
Marko SEVÓN
Pertti VÄRTÖ
Original Assignee
Protekno Puzair Oy
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 Protekno Puzair Oy filed Critical Protekno Puzair Oy
Priority to AU57652/96A priority Critical patent/AU5765296A/en
Publication of WO1996036267A1 publication Critical patent/WO1996036267A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B17/00—Methods preventing fouling
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L5/00—Structural features of suction cleaners
    • A47L5/12—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum
    • A47L5/22—Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. driven by motor vehicle engine vacuum with rotary fans
    • A47L5/38—Built-in suction cleaner installations, i.e. with fixed tube system to which, at different stations, hoses can be connected
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04—Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/24—Gas suction systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00—Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34—Details
    • B65G53/52—Adaptations of pipes or tubes

Definitions

  • the present invention relates to an arrangement as defined in the preamble of claim 1.
  • Suction or negative pressure can be used in a tubing system to convey widely varying kinds of materials, vari ⁇ ous industrial mass flows and in centralized vacuum cleaning units used in industry and various institutions to convey both dry and wet mass, powders, granular mate- rials and even piece-type materials.
  • very long suction tubes with multiple branches, connected to a single suction unit are used.
  • the suction tubing is composed of tubes of two different sizes, the trunk tubes having a larger diameter and the branch tubes at each supply connection a clearly smaller diameter.
  • the trunk tubing is constructed of two tubes of different diameters, branch tubes being connected to other branches of a larger di ⁇ ameter and these to collector tubes of a still larger di- ameter connected to a suction unit.
  • trunk tubes of a larger diameter The purpose of trunk tubes of a larger diameter is to reduce suction losses in long tube systems and thus to maintain a good suction effect of the system.
  • a source of problems in suction tube systems is the fact that the flow velocity of the suction air is reduced with increasing tube diameter. Therefore, the air flow velocity in the relatively thin branch tubes at each sup ⁇ ply connection may be very high, which is why the air flow can easily carry even heavy objects with it. When these objects reach the thicker trunk tubes, the velocity of the air flow carrying them is clearly reduced and this may have the result that the air flow in the trunk tubing is not sufficient to move these heavier objects all the way to the suction unit, but instead these objects remain in the trunk tubes, in which case they at least reduce the suction effect and may cause obstructions of varying degrees in the trunk tubes.
  • the object of the invention is to eliminate the problems referred to above.
  • a specific object of the in ⁇ vention is to produce a new type of arrangement in a suc ⁇ tion system, designed to prevent obstructions in the trunk tubing and ensure a faultless suction effect of the tube system whenever it is used.
  • the arrangement in a suction system comprises a central unit provided with regula ⁇ tion and control equipment; a suction tube system pro ⁇ vided with supply connections and consisting of trunk tubes and branch tubes for each supply connection; and a suction unit designed to create a negative pressure in the suction tube system.
  • one end of the trunk tubing is provided with a controllable valve, so that the trunk tubing can be flushed periodi ⁇ cally with a large amount of air supplied through the valve.
  • the trunk tubing consists of two or more trunk tube branches, each trunk tube branch being provided with a flushing valve at one end. It is also possible that a flushing valve is provided in each tubing section that is larger in cross-section than the smallest section in the suction tube system.
  • the valve is preferably a pneumatic actuator which is connected to a compressed-air source for opening and closing the valve.
  • the valve used is preferably a slide valve, which is easy and simple to open and close by means of a pneumatic valve.
  • the compressed-air source can be placed in conjunction with the central unit and the suction unit, especially when the suction unit needs com ⁇ pressed air e.g. for the cleaning of filters.
  • the valve is a pneumatic actuator which can be opened by a negative pressure pres ⁇ ent behind it in the trunk tube branch.
  • the suction sys ⁇ tem is a centralized vacuum cleaning system, in which case the supply connections are suction sockets.
  • the suction system is an industrial mass conveying system, in which case the supply connections are e.g. mass supply containers or funnels.
  • the system of the inven ⁇ tion has the advantage that it enables the suction tube system to be kept clean and an optimum suction effect to be continuously maintained, avoiding obstructions in the tubing which may result in difficult and expensive clear- ing operations.
  • Fig. 1 is a diagram representing a suction tube system according to invention
  • Fig. 2 is a diagram representing another application of the valve.
  • Fig. 1 presents a diagram of a centralized vacuum cleaning system, which comprises a suction unit 6 and a suction tube system 3 connected to it.
  • the suction tube system consists of trunk tubing 4 and, connected to it, a number of branch tubes 5 with suction sockets 2 provided at their ends.
  • the trunk tubing con ⁇ sists of two trunk tube branches 8.
  • each trunk tube branch 8 is provided with a valve 7.
  • a central unit 1 which contains a valve control unit 11 and a unit 12 monitoring the suction sockets 2.
  • a compressed-air source 9 Placed near the suction unit 6 is also a compressed-air source 9, by means of which the filters of the suction unit can be cleaned when necessary.
  • the valve control unit 11 is electrically connected to the valves 7, whereas the compressed-air source 9 is pneumatically connected to the valves 7 to allow the valves to be opened and closed with compressed air.
  • the suction socket monitoring unit 12 is electrically con ⁇ nected to all the suction sockets 2.
  • the system presented functions as follows.
  • the monitoring unit 12 in the central unit 1 detects this, whereupon the suction unit 6 is activated and draws air through the opened suction sockets.
  • the suction unit 6 continues operating and the valve 7 at the end of one of the trunk tube branches 8 is opened by the valve control unit 11 e.g. for 20 seconds. After this, the valve is closed and the valve at the end of the other trunk tube branch is opened in a correspond ⁇ ing manner.
  • valves used are open the tube end completely, in other words, they pres ⁇ ent as little resistance to air flow as possible, permit- ting a maximal air flow to be generated in the tubing to effectively remove any impurities that may remain in it.
  • the central unit 1 is preferably so arranged and programmed that the operations described above are car ⁇ ried out automatically, while the only external control applied to the system consists of the signals produced by the opening and closing of the suction sockets. It is naturally also possible within the scope of the invention to activate flushing of required tubes manually as well.
  • Fig. 2 presents another embodiment, in which the valve 10 at the end of a trunk tube branch 8 is opened without a separate compressed-air source.
  • the valve is connected to a pneumatic negative- pressure operated actuator 13, which is connected via a pipe 14 to the trunk tube branch 8 behind the valve 10.
  • the pipe 14 is provided with a control valve 15 controlled by the valve control unit 11.
  • the system works as follows. After the suction sock- ets 2 have been closed, the negative pressure in the trunk tube branch 8 increases strongly.
  • valve 15 is now opened by electric control, the negative pressure ap ⁇ plied via pipe 14 activates the actuator 13, which opens the valve.
  • An intensive air flow now flushes the tube branch 8 and cleans it.
  • the valve 10 is additionally pro ⁇ vided with a mechanical reset device, a spring which closes the valve when the opening effect of the actuator 13 on the valve is removed.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Cleaning In General (AREA)

Abstract

Arrangement in a suction system, which comprises a central unit (1) provided with regulation and control equipment; a suction tube system (3) provided with supply connections (2) and consisting of trunk tubing (4) and branch tubes (5) for each supply connection; and a suction unit (6) designed to create a negative pressure in the suction tube system. One end of the trunk tubing (4) is provided with a controllable valve (7) so that the trunk tube can be flushed periodically with a large amount of air supplied through the valve.

Description

ARRANGEMENT IN A SUCTION SYSTEM FOR SOLID MATERIALS
The present invention relates to an arrangement as defined in the preamble of claim 1. Suction or negative pressure can be used in a tubing system to convey widely varying kinds of materials, vari¬ ous industrial mass flows and in centralized vacuum cleaning units used in industry and various institutions to convey both dry and wet mass, powders, granular mate- rials and even piece-type materials. In such systems, very long suction tubes with multiple branches, connected to a single suction unit, are used. In such cases, the suction tubing is composed of tubes of two different sizes, the trunk tubes having a larger diameter and the branch tubes at each supply connection a clearly smaller diameter. It is also possible that the trunk tubing is constructed of two tubes of different diameters, branch tubes being connected to other branches of a larger di¬ ameter and these to collector tubes of a still larger di- ameter connected to a suction unit.
The purpose of trunk tubes of a larger diameter is to reduce suction losses in long tube systems and thus to maintain a good suction effect of the system.
A source of problems in suction tube systems is the fact that the flow velocity of the suction air is reduced with increasing tube diameter. Therefore, the air flow velocity in the relatively thin branch tubes at each sup¬ ply connection may be very high, which is why the air flow can easily carry even heavy objects with it. When these objects reach the thicker trunk tubes, the velocity of the air flow carrying them is clearly reduced and this may have the result that the air flow in the trunk tubing is not sufficient to move these heavier objects all the way to the suction unit, but instead these objects remain in the trunk tubes, in which case they at least reduce the suction effect and may cause obstructions of varying degrees in the trunk tubes. The object of the invention is to eliminate the problems referred to above. A specific object of the in¬ vention is to produce a new type of arrangement in a suc¬ tion system, designed to prevent obstructions in the trunk tubing and ensure a faultless suction effect of the tube system whenever it is used.
As for the features characteristic of the invention, reference is made to the claims.
The arrangement in a suction system according to the invention comprises a central unit provided with regula¬ tion and control equipment; a suction tube system pro¬ vided with supply connections and consisting of trunk tubes and branch tubes for each supply connection; and a suction unit designed to create a negative pressure in the suction tube system. According to the invention, one end of the trunk tubing is provided with a controllable valve, so that the trunk tubing can be flushed periodi¬ cally with a large amount of air supplied through the valve. In an embodiment, the trunk tubing consists of two or more trunk tube branches, each trunk tube branch being provided with a flushing valve at one end. It is also possible that a flushing valve is provided in each tubing section that is larger in cross-section than the smallest section in the suction tube system.
The valve is preferably a pneumatic actuator which is connected to a compressed-air source for opening and closing the valve. The valve used is preferably a slide valve, which is easy and simple to open and close by means of a pneumatic valve. The compressed-air source can be placed in conjunction with the central unit and the suction unit, especially when the suction unit needs com¬ pressed air e.g. for the cleaning of filters.
In a preferred embodiment, the valve is a pneumatic actuator which can be opened by a negative pressure pres¬ ent behind it in the trunk tube branch. In this case, there is preferably a mechanical spring connected to the pneumatic actuator to close it after a completed flushing operation.
In an embodiment of the invention, the suction sys¬ tem is a centralized vacuum cleaning system, in which case the supply connections are suction sockets. In an¬ other embodiment of the invention, the suction system is an industrial mass conveying system, in which case the supply connections are e.g. mass supply containers or funnels. As compared with prior art, the system of the inven¬ tion has the advantage that it enables the suction tube system to be kept clean and an optimum suction effect to be continuously maintained, avoiding obstructions in the tubing which may result in difficult and expensive clear- ing operations.
In the following, the invention is described in de¬ tail by the aid of the attached drawing, in which Fig. 1 is a diagram representing a suction tube system according to invention, and Fig. 2 is a diagram representing another application of the valve.
Fig. 1 presents a diagram of a centralized vacuum cleaning system, which comprises a suction unit 6 and a suction tube system 3 connected to it. The suction tube system consists of trunk tubing 4 and, connected to it, a number of branch tubes 5 with suction sockets 2 provided at their ends. In this embodiment, the trunk tubing con¬ sists of two trunk tube branches 8.
The end of each trunk tube branch 8 is provided with a valve 7. Mounted in conjunction with the suction unit 6 is a central unit 1, which contains a valve control unit 11 and a unit 12 monitoring the suction sockets 2. Placed near the suction unit 6 is also a compressed-air source 9, by means of which the filters of the suction unit can be cleaned when necessary.
The valve control unit 11 is electrically connected to the valves 7, whereas the compressed-air source 9 is pneumatically connected to the valves 7 to allow the valves to be opened and closed with compressed air. The suction socket monitoring unit 12 is electrically con¬ nected to all the suction sockets 2.
According to the invention, the system presented functions as follows. When one or more of the suction sockets 2 is in use or has been opened, the monitoring unit 12 in the central unit 1 detects this, whereupon the suction unit 6 is activated and draws air through the opened suction sockets. When use of the system is fin- ished and the last one of the suction sockets utilized is closed, the suction unit 6 continues operating and the valve 7 at the end of one of the trunk tube branches 8 is opened by the valve control unit 11 e.g. for 20 seconds. After this, the valve is closed and the valve at the end of the other trunk tube branch is opened in a correspond¬ ing manner.
An essential feature of the valves used is that they open the tube end completely, in other words, they pres¬ ent as little resistance to air flow as possible, permit- ting a maximal air flow to be generated in the tubing to effectively remove any impurities that may remain in it.
The central unit 1 is preferably so arranged and programmed that the operations described above are car¬ ried out automatically, while the only external control applied to the system consists of the signals produced by the opening and closing of the suction sockets. It is naturally also possible within the scope of the invention to activate flushing of required tubes manually as well.
It is also possible that the flushing of the tubing as described above is not performed after each time the system has been used, but is carried out at given inter¬ vals, e.g. once a day, e.g. by means of a timer provided in the regulation and control unit. In the system de¬ scribed above, it is possible to use various components and regulation methods known separately and in themselves to implement desired functions as described. They will therefore not be described in detail in this context. Fig. 2 presents another embodiment, in which the valve 10 at the end of a trunk tube branch 8 is opened without a separate compressed-air source. In this embodi¬ ment, the valve is connected to a pneumatic negative- pressure operated actuator 13, which is connected via a pipe 14 to the trunk tube branch 8 behind the valve 10. In addition, the pipe 14 is provided with a control valve 15 controlled by the valve control unit 11.
The system works as follows. After the suction sock- ets 2 have been closed, the negative pressure in the trunk tube branch 8 increases strongly. When valve 15 is now opened by electric control, the negative pressure ap¬ plied via pipe 14 activates the actuator 13, which opens the valve. An intensive air flow now flushes the tube branch 8 and cleans it. The valve 10 is additionally pro¬ vided with a mechanical reset device, a spring which closes the valve when the opening effect of the actuator 13 on the valve is removed.
In the foregoing, the invention has been described by way of example by the aid of the attached drawing, but different embodiments of the invention are possible in the scope of the inventive idea defined by the claims.

Claims

1. Arrangement in a suction system for solid materi¬ als which comprises a central unit (1) provided with regulation and control equipment; a suction tube system (3) provided with supply connections (2) and consisting of trunk tubing (4) and branch tubes (5) for each supply connection; and a suction unit (6) designed to create a negative pressure in the suction tube system, character- ized in that one end of the trunk tubing is provided with a controllable valve (7) so that the trunk tube can be flushed periodically with a large amount of air supplied through the valve.
2. Arrangement according to claim 1, characterized in that the trunk tubing (4) consists of at least two trunk tube branches (8) , the end of each trunk tube branch being provided with a flushing valve (7) .
3. Arrangement according to claim 1 or 2, character¬ ized in that a valve is provided in each tubing section that is larger in cross-section than the smallest section in the suction tube system.
4. Arrangement according to any one of claims 1 - 3, characterized in that the valve (7) is a pneumatic actua¬ tor which is connected to a compressed-air source (9) for opening and/or closing the valve.
5. Arrangement according to claim 4, characterized in that the compressed-air source (9) has been placed in conjunction with the central unit (1) and suction unit (6) .
6. Arrangement according to any one of claims 1 - 3, characterized in that the valve (7) is a pneumatic actua¬ tor which can be opened by a negative pressure present behind it in the trunk tube branch (8) .
7. Arrangement according to claim 6, characterized in that the pneumatic actuator is provided with a spring to close it.
8. Arrangement according to any one of claims 1 - 7, characterized in that the suction system is a centralized vacuum cleaning system, in which case the supply connec¬ tions are suction sockets.
9. Arrangement according to any one of claims 1 - 7, characterized in that the suction system is an industrial mass conveying system, in which case the supply connec¬ tions are mass supply containers or funnels.
PCT/FI1996/000271 1995-05-15 1996-05-14 Arrangement in a suction system for solid materials WO1996036267A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU57652/96A AU5765296A (en) 1995-05-15 1996-05-14 Arrangement in a suction system for solid materials

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19517793.2 1995-05-15
DE1995117793 DE19517793A1 (en) 1995-05-15 1995-05-15 Arrangement with a suction device for solids

Publications (1)

Publication Number Publication Date
WO1996036267A1 true WO1996036267A1 (en) 1996-11-21

Family

ID=7761947

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1996/000271 WO1996036267A1 (en) 1995-05-15 1996-05-14 Arrangement in a suction system for solid materials

Country Status (3)

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AU (1) AU5765296A (en)
DE (1) DE19517793A1 (en)
WO (1) WO1996036267A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2137814A1 (en) * 1996-08-02 1999-12-16 Procesos Ind Papel Y Filtracio Installation for the pneumatic transportation of lightweight materials
CN105650664A (en) * 2016-03-15 2016-06-08 常熟市虞盛农产品专业合作社 Rice husk conveying device for coal-fired boiler

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19940663C2 (en) * 1999-08-27 2002-01-24 Rolf Ferstl Inlet system for central vacuum systems
DE10039564B4 (en) * 2000-08-12 2009-11-05 Mann + Hummel Protec Gmbh Device for conveying bulk material
ITVR20070083A1 (en) 2007-06-12 2008-12-13 Moretto Spa PLANT FOR PNEUMATIC TRANSPORT AT CONTROLLED SPEED OF GRANULAR MATERIAL AND PROCEDURE FOR THE CONTROL OF CONVEYANCE SPEED

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE412050B (en) * 1978-06-26 1980-02-18 Svenska Flaektfabriken Ab PLANT FOR SUGAR TRANSPORT OF WASTE MATERIAL
FI910500A (en) * 1991-02-01 1992-08-02 Akp Tekno Oy STYRFOERFARANDE I CENTRALDAMMSUGARE.
FI94021B (en) * 1991-01-14 1995-03-31 Protekno Puzair Oy Method for regulating and controlling a central suction cleaner

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE412050B (en) * 1978-06-26 1980-02-18 Svenska Flaektfabriken Ab PLANT FOR SUGAR TRANSPORT OF WASTE MATERIAL
FI94021B (en) * 1991-01-14 1995-03-31 Protekno Puzair Oy Method for regulating and controlling a central suction cleaner
FI910500A (en) * 1991-02-01 1992-08-02 Akp Tekno Oy STYRFOERFARANDE I CENTRALDAMMSUGARE.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2137814A1 (en) * 1996-08-02 1999-12-16 Procesos Ind Papel Y Filtracio Installation for the pneumatic transportation of lightweight materials
CN105650664A (en) * 2016-03-15 2016-06-08 常熟市虞盛农产品专业合作社 Rice husk conveying device for coal-fired boiler

Also Published As

Publication number Publication date
DE19517793A1 (en) 1996-11-21
AU5765296A (en) 1996-11-29

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