Slurry conveyor system

• US 4,371,294 A
• Filed: 02/06/1981
• Issued: 02/01/1983
• Est. Priority Date: 02/08/1980
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Sakamoto, Masakatsu
• Primary Examiner(s): Nase, Jeffrey V.
• Application Number:
  US06/232,002
• Time in Patent Office: 725 Days
• Field of Search: 406/109, 406/128, 406/130, 406/146, 406/192, 137/566, 138/26, 138/31, 414/217
• US Class Current: 406/109
• CPC Class Codes: B65G 53/30 Conveying materials in bulk through pipes or tubes by liquid pressure
• CPC Class Codes: Y10T 137/86163 Parallel

Abstract

A slurry conveyor system in which a mixture liquid is charged into a supply pipe by a low-pressure mixture liquid pump through a valve, and, thereafter, fresh water of high pressure is supplied by a high-pressure fresh water pump into the supply pipe by a switching of the valve, thereby to force the mixture liquid from the supply pipe into a convey pipe to continuously convey the slurry. The supply pipe is provided with a pressure adjusting device for increasing or decreasing the pressure in the supply pipe to equalize this pressure to the pressure in a pipe connected to the supply pipe, thereby to facilitate the opening of the valve disposed between the supply pipe and the pipe connected to the latter.

Claims

1. In a slurry conveyor system using pressurized water, having a plurality of supply pipes arranged in parallel relation, valves disposed in said supply pipes, a low-pressure mixture pump adapted to charge mixture liquid into said supply pipes, and a high-pressure fresh water pump adapted to force the mixture liquid in said supply pipes into a convey pipe,

an improvement which comprises a pressure adjusting means in each supply pipe for varying the volume within the supply pipes to increase or decrease the pressure in said supply pipes to equalize said pressure to the pressure in a pipe connected to each of said supply pipes before opening a valve disposed between each of said supply pipes and said pipe connected to each of said supply pipes.

2. A slurry conveyor system as claimed in claim 1, wherein said pressure adjusting means associated with each supply pipe has a vessel communicating with the inside of said supply pipe and a plunger housed by said vessel, said plunger varying the volume of the space in said vessel communicating with the inside of said supply pipe.

3. A slurry conveyor system as claimed in claim 2, wherein said plunger of said pressure adjusting means is actuated by hydraulic means.

4. A slurry conveyor system as claimed in claim 1, characterized by further comprising a bypass valve disposed in parallel with each of the valve in the pipe for supplying the pressurized fresh water to said supply pipe and the valve in the pipe through which the fresh water is returned from said supply pipe, each of said bypass valve being opened after the operation of said pressure adjusting means for increasing or decreasing the pressure in said supply pipe to a level substantially equal to the pressure in said pipe having said bypass valve.