GB2086990A

GB2086990A - Hydraulic Ram Pumps

Info

Publication number: GB2086990A
Application number: GB8035845A
Authority: GB
Original assignee: CHOU YUAN CHUANG
Current assignee: CHOU YUAN CHUANG
Priority date: 1980-11-07
Filing date: 1980-11-07
Publication date: 1982-05-19

Abstract

In a hydraulic ram pump having an air chamber 8 in the outlet, the volume of air is controlled by an air outlet valve controlled by a float 9. <IMAGE>

Description

SPECIFICATION A Liquid Pump Technical Field The present invention relates to a liquid pump, and is particularly concerned with a pump for delivering water from a lower level to a higher level by the action of water head and air compression without the use of oil, electrical power, or an operator.

Background Art A previously proposed liquid pump has been capable of pumping water automatically for a period of 1 5 to 30 minutes. After that period, the pump did not operate sufficiently because air could not be discharged automatically from a liquid receiver and consequently a considerable air pressure built up in the receiver. This meant that no more water could enter the receiver and consequently it was not possible to continue discharging water from the pump.

Statement of Invention and Advantages It is an aim of the invention to alleviate the build up of excessive air pressure in the receiver, and according to the present invention there is provided a liquid pump comprising an inlet conduit having a valve outlet restrictable in response to liquid pressure in the inlet conduit, a receiver having an inlet port for liquid in the inlet conduit, a liquid outlet port and an air discharge port, a valve biassed to close the inlet port when the liquid pressure in the inlet conduit is below a preselected value, and closure means to close the air discharge port when the liquid level in the receiver is above a preselected level.

The closure means may be a float valve including a rod which is slidable in a tube to close the air discharge port.

The valve outlet may be restricted by a cover plate which is biassed to the open position, and an adjuster to adjust the position of a cover plate when in the fully open position. This cover plate may be pivotally mounted, and the adjuster is conveniently a rod which is in screw-threaded engagement with the cover plate and abuts a wall of the inlet conduit. Preferably a rebounder is provided to contact the cover plate when in its fully restricted position.

Figures in the Drawings One embodiment of a liquid pump of the invention will now be described by way of example, with reference to the accompanying illustrative drawings, in which: Figure 1 is a side elevation, partly in section, of a liquid pump, Figure 2 is a side elevation in section, of a cover means of the pump of Figure 1, and Figure 3 is a side elevation, partly in section, of the upper part of a receiver of the pump of Figure 1.

Detailed Description of Drawings Referring to the drawings, a liquid pump includes a water inlet conduit 1 of polyvinyl chloride 8 metres in length. One end a-f the conduit 1 is secured to a flange 2 and the other end of the conduit 1 is immersed in water one metre below the water surface.

The conduit 1 is coupled by the flange 2 to an inlet chamber 2A mounted on a base 3 which enables the pump to rest stably on the ground. An outlet port 41 is located in an end wall of the inlet chamber 2A, and a cover plate 4 is pivotally mounted to this end wall. This cover plate 4 is elighatly larger than the outlet port 41, and the cover plate 4 is biassed to the open position i.e. biassed clockwise in Figures 1 and 2. A screw-threaded adjuster rod having a control knob '10 is screwed into the cover plate 4 to abut the lower wall of the inlet chamber 2A. It will be appreciated that by screwing the adjuster rod further into or out of the cover plate 4 it is possible to adjust the position of the cover plate 4 relative to the outlet port 41.

A receiver chamber 8 is mounted on the inlet chamber 2A, and is connected to the inlet chamber 2A by an inlet port 81. This inlet port 81 Is normally closed by a piston 5 having a piston rod 6. This piston 5 is biassed into the closed position by a spring 7 acting between the piston 5 and a triangular stand 1 8. A water outlet port 12 is located at the lower region of the receiver chamber 8 and is coupled to a discharge pipe 13.

A locating tube 1 5 extends downwardly into the receiver chamber 8, and is secured at its upper end to a flange 1 6 covering the top of the receiver chamber 8. This locating tube 1 5 has opposed air inlet holes 11 extending through its upper portion. An air discharge port 14 is mounted on the central portion of the flange 1 6 to communicate with the interior of the locating tube 1 5. In consequence when the air inlet holes 11 are open air can pass between the interior and exterior of the receiver chamber 8 through the air inlet holes 11, the interior of the locating tube 1 5 and the air discharge port 14.

A float 9 is connected by a vertical rod 91 to a connecting rod 92 which makes a sliding fit in the locating tube 1 5. Referring particularly to Figures 1 and 3, it will be seen that when the float 9 has risen to approach the lower end of the locating tube 1 5 then the connecting rod 92 closes the air inlet holes 11 thereby preventing air transfer into and out of the receiver chamber 8.

In operation, when it is required to pump water the remote end of the inlet conduit 1 is located in the water which flows quickiy into the inlet chamber 2A thereby forcing the cover plate 4 anticlockwise against the action of its bias to almost close the outlet port 41. In consequence, the water pressure in the inlet chamber 2A rises until it forces upwardly the piston 5 against the action of the spring 7 to allow water to enter the receiver chamber 8, It will be appreciated that in this condition air can also enter the receiver chamber 8 through the air discharge port 14. The continued entry of water into the receiver chamber 8 causes the float 9 to rise until the connecting rod 92 closes the air inlet holes 11 thereby preventing further discharge of air from the receiver chamber 8.In consequence, water is forced out of the receiver chamber 8 through the outlet port 12 and along the discharge pipe 1 3. If the discharge of water along the pipe 13 causes a pressure drop in the receiver chamber 8 then the piston 5 recluses the inlet port 81 until the water pressure in the inlet chamber 2A builds up sufficiently to reopen the inlet port 91 and cause the flost 8 to recluse the air inlet holes 11.

The water pressure in the inlet chamber 2A required to open the inlet port 81 can be adjusted by adjusting the control knob 1(3 to change the fully open position of the cover plate 4. The cover plate 4 is prevented from completely closing the outlet port 41 by means of a rebounder 17 which projects a small distance into the inlet chamber 2A. This bounder 17 ensures that the cover plate 4 can pivot clockwise sufficiently rapidly without being affeeted adversely by a rise or fall in pressure.

The pump can be made of high grade steel plate or cast iron with rust-prnof and cormeive-proof treatment, or of copper or stainless steel. In consequence the pump is durable and rugged.

The pump can be used to pump water from a lower level to a higher level through the discharge pipe 13, and is suitable for example for providing irrigation.

The described and illustrated embodiment is designed according to the. following Specification: (1) Length of the water inlet conduit 1:- 8 metres; the diameter of the conduit 1 is double that of the discharge pipe 13.

(2) The above described air and water pressure arrangement for the receiver chamber 8 is designed for the required discharge capacity, pipe diameters, receiver capacity, and air and water volume.

(3) One pump of the invention has provided the following experimental data:- Length of Inlet Pipe Outlet Pipe Discharge Discharge Diameter Diameter Pipe Head 24/W (in.) (in.) (ft,) (It,) GAL 2 1 100 45 1800 4 2 100 45 3800 8 4 100 35 7000 12 6 100 35 10600 The described and illustrated embodiment of the invention includes the following components::- ( 1 ) Water Conduit, (2) flange, (3t Bose Machine, (4) Platon Valve, (41) Outlet Pert, (6) piston, (9) piston ISod, (7) Spring, (9) peceiver, (81) Water Inlet, (9) Float, (91) Vertical Rod, (92) Connecting Trod, (10) Adjusting Level, (11) Air Inlet Hole, (12) Water Outlet Port, (13) Discharge Pipe, (14) Air Discharge Hole, (15) Fixing Jacket, (18) Flange, (17) Rebounder.

(18) Triangular Stand.

The described embodiment of the invention has a float type automatic air pressure regulator at the top of a receiver chamber for containing a mixture of air and water. The pressure inside the receiver chamber 8 is dependent upon the amount of water entering and being discharged from the receiver chamber 8 so that the air pressure and water level in the receiver chamber 8 is kept in balance. In addition, there is a rebounder at the outlet port of the inlet chamber so that while the inlet water pressure increases the cover plate is bounded and released and consequently the outlet port 41 can be opened and closed automatically. In consequence, water can be pumped from a lower level to a higher level without use of electricity, fuel or man-power.

Claims

1. A liquid pump comprising an inlet conduit having an outlet restrictable in response to liquid pressure in the inlet conduit, a receiver having an inlet port for liquid from the inlet conduit, a liquid outlet port, and an air discharge port, a valve biassed to close the inlet port when the liquid pressure in the inlet conduit is below a preselected value, and closure means to close the air discharge port when the liquid level in the receiver is above a preselected level.

2. A liquid pump as claimed in Claim 1, in which said closure means is a float valve.

3. A liquid pump as claimed in Claim 2, in which the float valve includes a rod slidable in a tube to close the air discharge port.

4. A liquid pump as claimed in any preceding Claim, in which the inlet conduit outlet is restrictable by a cover plate biassed to the open position, and an adjuster to adjust the position of the cover plate in the fully open position.

5. A liquid pump as claimed in Claim 4, in which the cover plate is pivotally mounted, and the adjuster is in screw-threaded engagement with the cover plate.

6. A liquid pump as claimed in Claim 4 or Claim 5, and including a rebounder to contact the cover plate when in its fully restricted position.

7. A liquid pump substantially as herein described and shown in the accompanying drawings.