US684806A - Pressure-regulator for pumps. - Google Patents

Description

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e i t i .falliti KARL nnzinens, or Wenns, GERMANY, .assumera rro THE muren-a nniinrnonursonn MASCHINEN-rasant AKT. ons., VORM. nn. nu;

ZlNGER, OF l/VORMS, GER-MANY.

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Application died March 8, 1900. Serial No. 7,907. (No model.)

To all when@ zit riz/tty concern:

Be it known that I, KARL ENZINGER, a sub ject of the Emperor of Germany, and a resident ot 'Worms Germany, have invented certain new and useful Improvements in Pressure-Regulators for Pumps, of which the following is a full, clear, and exact specification.

The subject of the present invention is a new pressure-regulating device for pumps of all kinds. Regulators for this purpose hitherto in use are usually so constructed that when the pressure in the delivery-pipe is too high either the suction and delivery pipes are connected or the engine is stopped or the speed regulated. With the present regulator, on the contrary, the delivery-passages between the cylinder and delivery-valves coininunicato with chambers each having,r a ilexihle Wall, 0n the other side of this wall a pressure acts, which during; Working exactly eqnalizes the desired pressure of the liquid being delivered. nnnediately the liquidpressure exceeds that desired, however, the Wall yields, and the liquid, instead of entering the delivery-pipe, iows into the extra space set at its disposal by the yielding of the Wall. The area of this space which is thus set at disposal is such that there is sufficient room vfor the whole liquid pumped at one stroke of the piston to be taken up. The yielding walls may most advantageously be constructed as diaphragme acted upon' by compressed air, and this is the form of construction selected .for illustration on the accompanying drawings.

.Figure l shows a vertical. longitudinal section of a pump to which the new reguiator is applied. is a horizontal section of the regulator, showing the two diaphragm casings and cylinders. Fig. 3 is a part vertical sectional View taken through the centerof the regulator, Fig. l.

u is the crank-shaft of a double-acti ng pump, driven from any suitable source of power, by means ot inciting, by an electromotor, or the like The pump-cylinder B is of the ordinary construction for pumps for raising liquids.

, it is provided with two suction-valves e and two deliery-yalves c', each pair being connected yi'ith the .suction and delivery pipes,

respectively. The essential feature of vthe neuy regulator is that two casings or vessels m m are secured laterally of the pum p'f cylinder B, each of which Vessels is divided by a diaphragm 0 into two chambers r1 s. The

chambers r are connected with the pistonoyl' inder by passage u, while the chambers .s are connected by passages to the pipe from an air vessel A, the air in which is compressed by a small air-pump D. This air-pressure is maintained constant by means of a reducing and safety valve, whereby the tension may be regulated as desired. If, for instanceyin working the liquid being pumpedtis to be forced through the delivery-pipe at a pressure of, say, thirty pounds persquare inch, then this is the pressure which mustbe maintained in the air vessel A.

The manner of operation of the new pressure-regulator is as follows: The apparatus is first set in action without any liquid being pumped until the air-pump D has produced.

the desired pressure in the air vessel A.' The liquid to be pumped is then admitted to the suction-pipe of the pump. By reason ofthe pressure in the air vessel A thediaphragms' o o are pressed toward that side of, the Vessels m m which is adjacent to the pumpcyl inder B, so that the area o't the chambers r is diminished to zero, while the chambers s are correspondingly increased in area. The number of revolutions of the crank-shaft o must be so regulated that the output of the pump is greater than the quan tity of liquid required to be delivered. The result is that if more liquid enters the delivery-pipe than can be discharged there will be an increase in the pressure if no other outlet is provided. If, however, the pressure in the air vessel A is exceeded by the pressure in the delivery-pipe, the piston in the cylinder B will no longer force the liquid through the delivery-valves e' e', but will force it into the diaphragm ves sels. The amount so forced will he precisely that which is necessary to equalize the pressure in the delivery-pipe and the aiupressnrc in the vessel A. By reason of the liquid which has entered the diaphragm vessels the diaphragme will be f reed against the opposite side of their easings and the chambers 'r will roo be illed with liquid. lt will thus be clear that the air-pressnre on the diaphragm acting:r from the one side and the pressure from the delivery-pipe acting from the other side 'r will, exactly equalize each other during the delivery period, so that there will not be any increase of pressure in the' delivery-pipe. IE now the suction period com mences in the cylinder B first, the whole of the liquid in the chamber o' of the diaphragm vessel will be forced by the pressure of the air vessel A into the cylinder l5, and the area of the chamber 'i' will again be diminished tozero, and only then will the remaining suction eiiect of the pump-piston open the suction-valves e, letting so much il uid enter the cylinder from the suction-pipe as is necessary to malte up the normal quantity of liquid sucked up at each stroke. It now the delivery period again commences, the liquid will only enter thevdelivery-pipe until the desired pressure is reached,

.any further liquid flowing,r into the chambers fr of the diaphragm vessel ready to be forced into the cylinder B at the next suction period in the manner described.

From the above it is clear that the new pressureregulator admits of both the speed of the piston and lthe quantity of liquid delivered being altered at any time, as desired, without any change eccurri ng in the pressure in the delivery-pipe.

The chief advantages of this new pressure regulator are as follows:

First. In working it is not necessary that the speed of the motor or transmission oi power he uniform.

Second. The liquid to be pumped is always xnaintai ned at exactly the same pressure without there being amyv shock, so that there is no inducement for carbonio-acid gas or the like to escape from the liquid.

Third. The compressed air and the liquid pumped are always separated by the diaphragms, so`that they never come in contact 'with eachother.

seance Fourth. 'lhe apparatus may be adjusted lfor any desired delivery-pressure and this pressure maintained constant.

It will be clear that, although I have described only one particular l'orm of consn'sruction, the new regulator may be arranged. in various ways without departing.; from the es sential feature of the invention. Thus, for instance, the yielding walls need not necessarily be diaphragni-partitions, as shown, nor need theybe contained in casings ol' the partieular design illustrated. The position of such easings and the character of the passages may likewise be varied. The ari-angie ment of a compressedair vessel A and pump D will be found generally practical; but here also it is obvious other means might be applied to the same end.

Ilaving'thus described my invention indetail, what I claim as new, and desire to secure by Letters Patent, is-

The combination with the pump-cylinder and valved suction and delivery pipes, of a chamber in open communication therewith having an interior capacity equal to the interior effective capacity ol the pu 1n pcylinder, a diaphragm in said chamber, means for applying pressure on the side of said diaphragm, opposite the communication with the cylinder whereby said diaphragm may yield when the i liquiddischarge rises above aprer'lcterniined pressure and means whereby said pressure in rear of the diaphragm is kept from increasing as the diaphragm recedes whereby upon the increase in pressure of the liquid-discharge said pump is at once rendered inoperative, substantially as described.

In witness whereof l have hereunto signed my name, this 17th da.yofl1`cbi'ua1'y, 1900, in the presence of two subscribingl witnesses. KARL ltN'ilNt-lh] ll" ilnesscs:

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