DE2218781A1 - LIQUID DIAPHRAGM PUMPS - Google Patents

Description

April 18, 1972

A 1972 B / HD / ib

Company TAMAGAWA KIKAI KINZOKU KABUSHIKI KAISHA, 3-7, 2-Chome, Ginza, Chuo-Ku ,. Tokyo-To, Japan

Liquid diaphragm pumps

This invention relates to liquid diaphragm pumps, and in particular sludge pumps of the type of the oil-membrane ^N bran pumps, with which liquids are fed under pressure containing abrasive particles such as Erzaufschwernmixngen. More particularly, the invention relates to a new and advanced system for the automatic adjustment of the oil-sludge boundary layer and for the automatic venting of sludge pumps of the above type.

In mud pumps of the piston type and plunger type, the mud flows directly into the interior of the cylinders, whereby the inside of the cylinder and other parts are subject to rapid wear and tear, which means they can be operated for a long time

^ ₁ ', .. 209882/0566 ment can endure.

Liquid diaphragm slurry pumps have emerged as a solution to this problem are developed and are currently widely used. A slurry pump of this type contains im essentially a vibrating pump that carries a liquid (e.g. oil) with a specific weight less than that of the sludge to be pumped is set in a reciprocating motion, with a valve chamber Sludge suction and delivery valves, and a vertical oil membrane chamber, the upper part of which is connected to the cylinder of the vibrating pump via an oil line and at its lower part via a mud line with part of the valve housing between the suction and delivery valves connected is.

The lower part of the oil membrane chamber and the mud pipe are filled with mud, while the upper part of the membrane chamber above the mud, the oil pipe, and the Cylinder of the vibrating pump are filled with oil. The difference between the specific weights of the mud and the oil ensures that the oil over the mud in the The oil membrane chamber remains, with a boundary layer between the two liquids. That way becomes a oscillating or pulsating movement supplied to the sludge,

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while the mud is prevented from entering the pump cylinder to penetrate.

Slurry pumps of this type are disclosed in Japanese Patent No. 12131-1960, American Patent No. 3,241. 496, British Patent No. I.I87.912 and South African U.S. Patent No. 68/0752.

Because the pump cylinder and the piston or the plunger pass through the mud in a mud pump of this liquid-membrane type shows no wear, the sludge pump can convey sludge under pressure with a high degree of efficiency. However, with this pumping it is necessary to place the boundary layer between the oil and the sludge in an oil membrane chamber to keep it in place continuously. To this boundary layer continuously within a To keep the position range in the membrane chamber during operation, it is therefore common practice that the Operator manually makes periodic checks and all necessary manual adjustments according to the results of these controls.

Also, after a long period of continuous separation Establishments ;; the air that accompanies the mud

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ORIGINAL

and gets into the oil membrane chamber, in front of sludge and collects to each other in the chamber. When the amount of air becomes large, the pump delivery decreases. As a remedial measure, it has been so far it has been customary for the operator to carry out periodic checks and open a vent valve, through which the accumulated air is released. For these reasons it is therefore necessary that there is always one or several operators are present in the pumping station.

The object of the present invention is to automate and thereby automate the operating method described above to avoid hiring an operator at the pump, and at the same time a malfunction and others Eliminate difficulties that could arise from the lack of an operator, whereby the primary goal is to reduce operating costs.

In accordance with this invention, an automatic control system is provided which automatically and controllably enables the Maintain the oil membrane and the inside the oil membrane chamber an oil membrane sludge pump located air is separated, wherein the control system is a level indicator for displaying the oil membrane position, an air display device for displaying the amount of air inside the Karuner,

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oil supply and drainage valves, and an automatic control device Contains which, based on the display signals of the level and air display device, the oil supply and oil drain valves controls, thereby holding the oil membrane in a predetermined normal position and the air out of the chamber dismisses.

An embodiment of the invention is shown in the drawing and is described in more detail below. The only FIGURE of the drawing is a schematic side view showing, in a vertical section, the essentials Parts of an oil membrane slurry pump, which shows an example of the automatic control system according to this invention.

As briefly described above, an oil Mernbran contains slurry pump essentially a pumping device A, a valve housing B, and an oil membrane chamber in between G, which is linked to the previous two.

The pumping device A includes a drive mechanism 1 for the plunger pump, a plunger or tappet 2, and a cylinder 5 in which the plunger 2 operates. The valve

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housing device B contains a valve housing 4, upper (Discharge) and lower (suction) valve seats 5 and 6 provided within the valve housing, ball valves 8 and 7, which work together with the valve seats 5 or 6, a sludge suction line 9 and a sludge discharge line 10. The oil membrane chamber device C includes a vertical one Chamber 11, an oil line 12 connecting the upper part of the chamber 11 to the pump cylinder 5, an oil line 13, which the lower part of the chamber 11 with a between the two valve seats 5 and 6 of the valve housing 4 lying Part connects, and an oil tank 15, which is above the chamber 11 is attached and is connected to the upper part via an oil supply valve 14.

By opening the valve 14 and introducing oil 0 from the tank 15 in the upper part of the chamber 11, in the Oil line 12, and into the pump cylinder J, and by introducing the sludge S in the lower part of the valve housing 4, the sludge line 15 and the lower part of the chamber 11, forms in the chamber 11 between the oil 0 and the Sludge S because of the difference in specific gravity usually has a boundary layer L. After a suitable Amount of oil 0 has been admitted, the valve 14 shot.

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In this way, an oil membrane forms at this boundary layer L, and the position of this boundary layer L changes vertically within the chamber 11 in accordance with the increase and decrease in the volume released by the plunger 2-im ■ Cylinder 3 is taken, with the pumping movement on the Mud is transferred.

When the drive mechanism 1 pushes the plunger 2 to the left on the compression stroke, as shown in the drawing, the oil from the cylinder j5 is pushed into the diaphragm chamber 11, pushing the interface L downward and exerting pressure on the liquid column of the sludge S exercises. This exerted pressure is transmitted through the sludge line 1J to the sludge located between the upper (discharge) and lower (suction) valve balls 7 and 8 in the valve housing 4. As a result, the suction valve 8 is closed and the dispensing valve 7 is raised and opened, as a result of which a sludge volume, which is essentially equal to the sludge volume displaced in the membrane chamber 11, is transferred into the dispensing line 10.

During the backward stroke of the plunger 2, a negative pressure is exerted on the oil 0, which is thereby converted into

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the cylinder 5 is sucked, wherein the interface 11 is raised and the negative pressure via the sludge S in the membrane chamber 11 and the sludge in the ■ connecting line 1J on the between the valves 7 and 8 in the valve housing 4 located sludge is transferred. The dispensing valve 7 is closed, and the suction valve is closed 8 is opened so that the sludge is drawn from the suction line 9 through the connecting line I5 to the chamber 11 can be.

In this way, the reciprocating movement of the plunger 2 causes a pumping action, with the sludge from the suction pipe 9 is received and passed into the delivery line 10.

The foregoing object is achieved in accordance with this invention achieved in that in a sludge pump the above a control system is provided with which, as described below, the level of the oil-sludge boundary layer L and the air accumulated in the oil-membrane chamber 11 are automatically controlled Will get removed.

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In the example of the control system shown in the drawing, four sensors 16, I7, 18 and I9 are from the Side walls of the membrane chamber 11 in certain corresponding Held at a height, these four sensors pass through the side walls. The lowermost sensor 16 is provided to determine the interface L at its lowest fluctuation limit and is at the lowest boundary layer limit, necessary for operation. The sensor 17 is provided to the interface L at its fixed center position and is attached to the desired normal center position. The sensor 18 is intended to detect the interface L at its upper fluctuation limit and is at the uppermost boundary layer limit, necessary for operation. The highest sensor 19 is provided to detect the presence of Detect air and is attached in the vicinity of the highest part of the tank chamber interior 11.

All sensors are connected to a control device 20 to which they each send observation signals. The control device 20 has any known suitable structure for automatic control as described below, and FIG the output side of this control device is with the automatic

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controllable valves 14 and 22 connected. As already mentioned, the valve 14 is an oil supply valve that is shown in FIG an oil supply line from the oil tank 15 to the upper part The membrane chamber 11 is attached. The valve 22 is installed in 'an oil return line 21, which leads to the from the top of the chamber 11 to the top of the oil tank 15 leading systems. The oil return line 21 and the oil supply line in which the valve is installed is, are provided with appropriate devices, such as a check valve (not shown) to reverse an oil flow to the desired direction (as indicated by arrows) to prevent.

The control system of this invention operates with the structure described above during the operation of the slurry pump in the following way.

First, the membrane chamber 11 is filled with oil before the operation of the sludge pump that the middle Location of the boundary layer L is at the level of the sensor 17. It then becomes the drive mechanism of the pump is started and normal operation of the slurry pump begins as described above.

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However, if the sludge pump is in operation for a long period of time, the level of the sinks Boundary surface L gradually downwards, as e.g. the filling is wetted and the oil leaks, which leads to a Decrease in the amount of oil in the chamber 11 and thereby to a disruption of the initial equilibrium between the Mud S and the oil 0 leads.

As the interface level continues to move upwards and reaches the level of the sensor 18 which the determines the upper limit, the sensor 18 determines this state and automatically sends a corresponding signal the control device "· £ ö. The '" * E control device 20 generates and then transmits automatically an output signal which the oil supply valve 14 causes it to open. Oil from the tank is polarized 15 in. The interior of the chamber 11, whereby the The level of the interface L lowers.

When the interface is the level of sensor 17 (i.e. reaches the fixed center position), the sensor 17 detects this state and sends a corresponding one osignal to the Hegel device 20, which thereupon an output signal manufactures that closes the oil supply valve 14 .. Auf dieue Alternatively, the interface is automatically adjusted to the predetermined normal center position.

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If for some reason the interface L lowers and reaches the level of the sensor 16, the Sensor 16 determines this state and sends a corresponding signal to the control device 20. The control device 20 sets on the basis of this display signal, an output signal to open the valve 22, whereby part of the oil in the ' Chamber 11 through line 21 due to the pressure of the Plungers 2 returns to the oil tank 15. As a result the interface rises, and when it reaches the level of sensor 17, sensor I7 sends a signal to the control device 20, which then closes valve 22. In this way, the normal level of the interface L becomes automatic set to the specified normal position.

In this way, if for any reason the position of the interface L deviates from the correct normal position and reaches a level outside of the range necessary for operation, this state of one of the sensors 16 and 18, and the display signal to the Control device 20 sent, whereby the appropriate valve for the supply or discharge of the oil is automatically opened and is then closed, and the interface is thereby automatically set to its normal position.

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In addition, when air accumulates in the membrane chamber 11 and reaches the specified position of the air sensor 19, the air sensor 19 indicates this state and
sends a display signal to the control device 20. The control device 20 opens on the basis of this signal, the valve 22 for a short time, whereby the accumulated air through the
Line 21 is released into the atmosphere.

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Claims (2)

.PATENT TO SPEECH Oil membrane sludge pump with an oil membrane chamber, in which an oil-sludge interface that forms an oil membrane is established, characterized by a Control system comprising a level indicator for indicating the oil membrane position, an air indicator for displaying the amount of air inside the chamber (11), an oil supply valve (14) and an oil discharge valve (22), and an automatic control device (20) which, depending on the display signals of the Level indicator and the air indicator controls the valves (14, 22) and thereby keeps the oil membrane in a predetermined normal position and removes the air from the Chamber (11) released. 2 Π Π 9 3 2/0566