# US 5,704,990 A · Method of blowing conveying conduits free of material after conveyance

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- Number: US 5,704,990 A
- Document ID: US5704990A
- Status: Granted
- Kind: A
- Application number: 08/340,852
- Filed: 1994-11-15
- Granted: 1998-01-06
- Earliest claimed: 1993-11-15
- Assignees: Zeppelin Schuettguttechnik GmbH
- Inventors: Wolfgang Krambrock; Harald Wilms
- Web page: https://patentgrep.com/patent/US5704990A

## CPC

- B65G 53/521: {means for preventing the accumulation or for removal of deposits (preventing accumulation in pipes in general F16L55/24)}
- B65G: TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS (packaging B65B; handling thin or filamentary materials, e.g. paper sheets or thread, B65H; cranes B66C; portable mobile or lifting or hauling appliances, e.g. hoists, B66D; devices for lifting or lowering goods for loading or unloading purposes, e.g. fork-lift trucks, B66F9/00; emptying bottles, jars, casks, barrels or similar containers, not otherwise provided for, B67C9/00; delivering or transferring liquids B67D; filling or discharging vessels for liquefied, solidified or compressed gases F17C; pipe-line systems for fluids F17D)

## Abstract

A method of advancing material through a conveying conduit and blowing the conveying conduit free of material after conclusion of material conveyance includes the following steps: passing a conveying gas through a conveying conduit with a first flow rate for transporting the material therein; after conclusion of the conveying step, passing the conveying gas through a first gas inlet of an injector; drawing additional gas into the injector through a second inlet thereof by the conveying gas entering the injector through the first inlet; and passing a mixture of the conveying gas and the additional gas with a second flow rate, which is greater that the first flow rate, from the outlet of the injector through the conveying conduit for blowing the conveying conduit free of material.

## Claims

### Claim 1

A method of advancing material through a conveying conduit and blowing the conveying conduit free of material after conclusion of material conveyance, comprising the following steps:
(a) providing an injector having a first gas inlet, a second gas inlet and a gas outlet;
(b) passing a conveying gas through a conveying conduit with a first flow rate for transporting the material therein;
(c) after conclusion of step (b), passing the conveying gas through the first gas inlet of the injector;
(d) drawing additional gas into the injector through the second inlet by the conveying gas entering the injector through the first inlet; and
(e) passing a mixture of the conveying gas and the additional gas with a second flow rate from the outlet of the injector through the conveying conduit for blowing the conveying conduit free of material; the second flow rate being greater than the first flow rate.

### Claim 2 (depends on 1)

The method as claimed in claim 1, wherein the conveying gas is one of compressed air, nitrogen and carbon dioxide.

### Claim 3 (depends on 2)

The method as claimed in claim 2, wherein the pressure of the conveying gas is greater than 1.5 bar and the velocity of the gas mixture flowing through said outlet in step (e) is between 15 and 35 m/s.

### Claim 4 (depends on 2)

The method as claimed in claim 2, wherein step (d) comprises the step of drawing the additional gas from the environment.

### Claim 5 (depends on 2)

The method as claimed in claim 2, wherein step (d) comprises the step of drawing the additional gas from a gas reservoir.

### Claim 6 (depends on 1)

The method as claimed in claim 1, further comprising the step of generating the conveying gas by a compressor.

### Claim 7 (depends on 1)

The method as claimed in claim 1, further comprising the step of generating the conveying gas by a plurality of compressors.