HU205982B - Cylinder-membrane feeding pump machine-unit of pneumatic operation and controllable fluid delivery - Google Patents

Abstract

FIELD OF THE INVENTION The present invention relates to a pneumatically operated roll diaphragm metering pump unit for dispensing liquid phase materials. The unit has a enclosed housing, a suction and discharge valve, and a roll diaphragm providing alternatingly increasing and decreasing space. The cylindrical diaphragm has an axial dimension greater than the length of the housing, so that it has a barrel-shaped mantle surface in its resting position. The actuator air connection (11) is provided by the actuators of the housing (2) and the outer casing of the cylinder diaphragm (1). The compressed air flows alternately into the actuator or exits from there. In doing so, the working space decreases or increases alternately, and the fluid to be fed through the intake valve (6) enters the working space (7) or exits through the pressure valve (5) toward the dispensing site. The metering fluid flow can be adjusted continuously during operation by varying the frequency of switching on and off the compressed air. BIG HU 205 982 Scope of the description: 4 pages (including J sheet)

Description

BACKGROUND OF THE INVENTION The present invention relates to an adjustable fluid displacement pump device. It is suitable for controlled and controlled dosing of various liquid phase chemicals and solutions and for the preparation of liquid mixtures. Liquid dosing is needed in many industries, particularly the chemical industry, power plant water treatment, drinking water and wastewater treatment.

The apparatus of the present invention is capable of satisfying the requirements of a metering pump in practice:

- chemical resistance to the transport of various liquids,

- the volume of dosing is accurate, regardless of the back pressure at the dosing site,

- the liquid transport can be changed.

The 1987 Chemical Engineers' Manual contains a good summary of the types and operating principles of liquid metering pumps currently used in the industry. Of the screw, gear, rotary piston, piston and diaphragm pumps described herein, a machine unit according to the invention is close to the latter.

The currently known dosing diaphragm pumps have a flat diaphragm design in which the diaphragm is displaced by an eccentric or crank actuator on a forced path, with or without the fluid medium.

The stepless adjustment of the metering pumps during operation can be achieved by the electric or mechanical speed control of their drive or by a mechanical stroke or eccentricity adjustment unit. Mechanical adjustment options eliminate the remote adjustment required for automated processes. Each of these control options requires expensive electrical or mechanical assemblies, parts, and multiple moving parts.

The closest solution to the unit of the invention according to the diaphragm pumps described in the said book is the supply air-operated tubular-diaphragm pump (CODIP) and the also air-fed DORR-OLIVER diaphragm pump. From the working space of the latter pumps, the fluid to be conveyed is pushed through the diaphragm into the discharge line through the supply air.

When suction is required, the DORR-OLIVER diaphragm pump can only operate with a diaphragm return spring solution, while the tubular diaphragm pump requires a double diaphragm and a transfer medium.

The mortar pump described in FÁY-TROSKOLANSZKY-VARGA: "Pump Operator's Manual" is an integrated unit of a rubber cylinder diaphragm pump and a piston pump, which is interconnected by the water medium. The position of the diaphragm in this solution is clearly determined by the position of the piston. This pump can run in suction mode, but also includes a costly crank mechanism, piston and cylinder.

The mortar pump cylinder diaphragm has no shaft

982 B 2-way thrust because it is not needed. US 4,104,005 has a similar patent. This pump contains a thin-walled hose diaphragm. The hose diaphragm is clamped into the housing by a flange, but the diaphragm is not prestressed, only the proper sealing is the purpose of the clamp. The pump does not require suction to pump the blood, so this pump can only operate with inlet flow with a hose diaphragm as described.

The hose is normally spherical in shape and is in a three-flap folding state at the time of the pneumatic pulse. From the latter state, the baseline is restored only by the influx of inflow.

Thus, to date, no simple displacement dosing pump having a single movable component has been made. The cylindrical diaphragm metering pump assembly of the present invention, unlike any prior art solution, incorporates a single movable component in addition to the valves for suction installation. The essence of the solution is based on the fact that the displacement diaphragm pump has a diaphragm which always has the same resting position even if the suction pipe is under low vacuum. The membrane is a separate component, e.g. without spring or actuator.

SUMMARY OF THE INVENTION The invention is based on the recognition that a tubular cylindrical membrane with a thick walled elastic material (e.g., rubber) is deformed into a barrel when subjected to axial compression even when the inner surface of the tube is in contact with a smaller pressure space than its outer surface.

The cylindrical diaphragm forms the volume change element of the metering pump according to the invention.

In a possible embodiment of the metering pump according to the invention, the elastic material roller diaphragm is housed in a housing having a limited space.

The axial size of the cylinder diaphragm is larger than the length of the housing, whereby the cylinder diaphragm, when mounted in the housing, receives an axial compression force and is deformed into a barrel, its outer periphery contacting the inner peripheral surface of the housing.

The internal volume of the cylinder diaphragm and the volume of the enclosed variable volume enclosed by suction and discharge valves at both ends are determined by the position of the cylinder diaphragm. The position of the cylinder diaphragm is determined by the pressure ratio between the outer peripheral surface of the cylinder membrane and the enclosed operating space and working space.

The cylinder diaphragm metering pump operates alternately to increase and decrease the volume of the working space by pulsing into the operating space with the help of compressed air. The liquid to be added flows into and out of the working space. The direction of fluid delivery is determined by the suction and discharge valves delimiting the work area. The suction valve always flows only into the increasing working space and the outlet valve only leaves the decreasing working space.

HU 205 982 B

The cylinder diaphragm metering pump assembly has a housing of the most common form, a suction and discharge valve, and an alternating cylinder diaphragm for increasing and decreasing volume.

The cylindrical diaphragm has an axial size greater than the length of the housing, thus having a barrel-shaped peripheral surface mounted at rest. The space defined by the housing and the outer periphery of the cylinder diaphragm has a compressed air connection. In one embodiment, the operating compressed air is an on / off power supply, which provides infinitely variable control in electronic mode, in another embodiment a pneumatic solution.

An embodiment of the cylinder diaphragm metering pump according to Fig. 1: In the barrel-shaped housing (2), the cylinder diaphragm (1) is enclosed in a space enclosed by flange-shaped truncated conical parts delimiting the suction and discharge sides (3,4). The outer periphery of the cylinder diaphragm (1) contacts the inner peripheral surface of the housing (2). The suction valve (6) is in the flanged conical part (3) and the pressure valve (5) is in the flanged conical part (4). The suction valves are connected to the suction line (10) and the suction valves to the pressure line (9). The compressed air connection (11) is located on the housing (2).

The nozzle (11) on the barrel-shaped housing (2) of the diaphragm metering pump is connected to the commercially available solenoid valves (13) for air intake (13) and for exhaust air (12). The pulse transmitter (8), which produces pulses of variable frequency, alternates the solenoid valves. After opening the air inlet solenoid valve (13), the compressed air flows into the operating space delimited by the pump housing (2) and the diaphragm (1), while the cylinder diaphragm is pressed against the flanged suction and discharge side sealing elements of the suction and discharge valves.

By deformation of the cylinder diaphragm (1), after opening the discharge valve (5), fluid is discharged from the descending working space (7) into the space connected to the end of the discharge pipe (9). Subsequently, the impulse transducer closes the air intake solenoid valve 13 and the air exhaust valve 12 to cause the deformed, thick-walled, prestressed cylinder diaphragm to take its original shape and expel air from the operating space. During this process, the pressure valve (5) closes, the suction valve (6) opens and fluid flows through the suction pipe (10), e.g. from a chemical reservoir to the working space of the pump (7), and the amount of air between the barrel-shaped housing (2) and the cylinder diaphragm flows outwardly through the air exhaust valve (12). Subsequently, the process described so far under the effect of the pulse transmitter is repeated continuously and the pump delivers liquid.

The structure of the metering pump according to the invention makes it clear that its manufacture does not require the manufacture of high precision parts, a simple and therefore reliable unit. Because of its simplicity, it can be done with little labor, so it's cheap. Pneumatic or electrical actuation of the unit allows the dosing fluid to be remotely controlled from a proximity to the power unit located further from the pump unit.

Claims (3)

PATENT CLAIMS 1. An adjustable fluid delivery, pneumatic actuated cylinder diaphragm metering pump having a manifold housing for connecting a pressurized air line, a flanged portion of the housing to form a working space on both sides, a flanged valve flange, and a flap and a power supply for actuating an inlet valve or an exhaust valve in a compressed air line, characterized in that the elastic roller diaphragm (1) has a length greater than the length of the housing (2) and the flanged parts (3, 4) extend into the working space (7) , and the cylindrical diaphragm (1), when unloaded, rests on the surface of the truncated cone-shaped inner cores on the barrel-shaped inner surface of the housing when loaded with compressed air. 2. A diaphragm metering pump according to claim 1, characterized in that the power supply is electric. 3. A diaphragm metering pump according to claim 1, characterized in that the power supply is pneumatic.