US2207493A - Means for feeding a continuously uniform quantity of fluids - Google Patents

Description

my 9, i940- J. VAN DARTELEN Y 2,207,493

MEANS FOR FEEDING A -CONTINUOUSLY UNIFORM QUANTITY 0F FLUIDS Filed JulyG, 1937 zbmion .JOHANNES VAN DARTELEN l BY W7 MMM Patented July 9, 1940 UNITED STATES MEANS FOR FEEDING A CONTINUOUSLY UNIFORM QUANTITY F FLUIDS Johannes van Dartelen, Vlissingen, Netherlands,

assignor to Deutsche fabrken A.G., Berlin-Charlottenburg,

Waffenund Munitions- (gier-A many, a joint-stock company` of Germany Application July 6, 1937, Serial No. 152,203

In Austria 3 Claims.

This invention relates to a device, or in general to means for feeding continuously uniform quantities especially of liquids but also of vapors or gas and of spinning solutions for the manufacture of artificial silk, artificial fibres or the like, by combining a feeding device with a discharge regula-ting device. In connectionv with this arrangement the quantity fed by the feeding device should be greater than the quantity taken up and fed by the regulating device. Furthermore, in the device a diaphragm responsive to pressure should be inserted.

The main feature of the invention consists in the fact that two or more feeding devices are arranged before the device regulating the quantity. These feeding devices Vmay be arranged as geared pumps one behind the other, that is in line, or one beneath the other, that is in parallel. The feeding elements of one pump are arranged so with respect the feeding elements of the other as to give a phase-displacement.

Devices are known which tend to give a uniform and equal feeding of liquids even in respect of a changing resistance within the discharging tubes. However, with these known devices the desired effect of acompletely uniform feeding' even in the case of an elevated pressure of resistance within the discharging pipes cannot be attained, because these known devices consist of only two rotary-or geared-*pumps arranged in line and driven in such a manner that the feeding effect of the first pump is greater than. the feeding effect of the second pump arranged ber hind the rst and fed by the same. The rearward flow of the fed liquid in connection with changing pressures and the faults created thereby cannot be avoided with these known devices, because they contain a single feeding device only in connectionwith a pressure regulating device, by which only the feeding to a second device producing the final feeding may be regulated.

Furthermore, these known devices even with some constructional changes cannot be used in practice because they can beinserted into a .great number of existing machines, especially into the machine for the manufacture of artificial silk,

only if these machines are subjected to greatv changes, which cannot be made without stopping with these machines the continuously uniform feeding is of greatest importance, because the 55 pressures in the discharging tubes sometimes "July 9. 1936 (Cl. 103-11) i climb up to such a height that a uniform feeding cannot be maintained.

Up to now there has not become known a single device, which would ensure a. uniform feeding, that is with a pressure of -40 atmospheres in the feeding and the discharging elements forming the transporting organs of cthe pump. This great disadvantage causes heavy faults in the product, e. g., when manufacturing artificial silk so that this product becomes useless.

The demand to feed a completely uniform and continuous quantity of liquid even within the smallest time-intervals cannot, be fulfilled with a single feeding device, and consequently the invention proposes a device in which the feeding of, the liquid or the like to the regulating device will be effected by means of two or more geared pumps which in. the best manner may be arranged in line, but which can be arranged in parallel as well. The position of the feeding teeth of the pairs of gear wheels of the two or more feeding devices will be such that the teeth are offset with respect to the feeding phase so that the number of periods may be increased in a simple manner. If for instance, two pumps are arranged one behind the other the number of periods will be nearly doubled,` and it will be increased further in connection with a still greater number of feeding pumps. At the same time the periods are diminished with respect to the difference of uctuation thus ensuring within smallest intervals of time a uniform -and shockless feeding of liquid even if the -pressure difference within the feeding and discharging tubes changes, that is, rises. 3

In order to cut ofi the discharging pipe behind the regulating device and in order to thus avoid loss of packing or the like in View of wear of the feeding teeth of the regulating device according to the invention a cut-of! device maybe 40 used consisting of a diaphragm entering into action at once if the regulating device transports.

a small quantity. This sudden entering into action may be attained according to the invention (in contrast with known constructions) by a completely symmetrical arangement of this diaphragm with respectto the feeding and discharging pipes. A further safety valve may be provided, for instance as a small frangible plate which will break in a known manner if a certain maximum pressure is reached, and thus-serving as a safety valve protecting the device from high-l er pressures than the desired pressure admitted by the construction.

According to the invention also this safety device is inserted into the stream of the discharged liquid, and thus dead spaces, as they appear in connection with other constructions, are com-- pletely avoided.

-To more clearly describe the present invention the annexed drawing may serve in connection with the following description. 'I'he drawing shows an example.

Fig. 1 is a longitudinal section of a feeding and regulating device according to the invention.

Fig. 2 is a longitudinal section taken atright angles to the section according to Fig. 1.

Fig. 3 is a fragmentary view of the feeding teeth of the feeding pumps.

In order to render the illustrations perfectly clear a number of arrows are indicated in Figs. 1 and 2 toshow the feeding direction of the uid.

The fluid (liquid, vapor, gas or the like) is fed with a certain pressure created by air-pressure or a compressing device (not shown) to the channel I (Fig. 1). This channel I is in communication with the suction channel 2 of the feeding pumps 3, and furthermore with the opening 4 of the right chamber 5 of'a chamber 6 which is divided by means of an elastic diaphragm 8 into a right chamber 5 and a left chamber 1. The elastic diaphragm may consist of rubber or a thin platel of steel clamped between th'e plates 9 and I forming a part of the housing of the device according to the invention.

By means of. an opening II the right chamber of the chamber 6 is connected to the channel I2 which is in communication with the feeding devices 3 and an opening I3 connected to the suction channel I4 (Fig. 2) which latter connects the/feeding devices and the regulating device I5. The pressure channel I6 of this regulating device l5 opens at I1 into the left chamber 1 of the room or chamber 6, and connected to this cham ber 1 is the opening I8 which is in communication with the discharging channel I9. Into this channel I9 a safety valve 20 is" inserted constituted by a frangible plate covering an opening 'of this channel and being capable of breaking, if

a certain maximum pressure will be exceeded.

The feeding device 3 feeds a greater quantity of fiuid'than that taken up by the regulating device I5 arranged behind the feeding device 3. This feeding device 3 consists of at least two pumps, but according to the invention a greater number of these pumps maybe used as well. The operation of the device is as follows: Under the action of the pressure createdby an outer pressure source (not shown) the fluid enters through the channel 2 into the feeding pumps 3, by means of which it is brought through the channel I2 and the opening II into the right chamber 5 and further through the opening I3 into the channel I4 of the regulating device. In view of the pressure created by the feeding pumps 3 the diaphragm 8 will be bent to the left thus completely or partially closing the discharging pipe I8. The surplus of the fed fluid which will not be taken up b y the regulating device I5 flows to the right chamber 5 and back to the channel I through the opening 4.

The regulating device I5 feeds the fluid through the channel I6 and the opening I1 into the left chamber 1. In the case of equalfpressures in the right and the left chambers 5 and 1 the opening I3 will be free, so that the fluid to be fed flows throughthe channel I9 to the device which feeds the fluid to the place of use. If the counter-pressure within the channel I9 becomes too great the closing pressure, at which the opning 4 will be closed, will be determined by this counter-pressureand the opening 4 will be free only if this counter-pressure will be overcome by the pressure created' by the feeding pumps.l Thus it can be attained that the pressures within the suction channel and within the discharging channel Il are always equal, so that the feeding effect will be uniform and will always remain independent of any wear of the feeding teeth or of any changing pressure, as may arise in practice by clogging of the spinning holes, by an elevated viscosity or by other reasons.

As may be clearly seen from the drawing the channel openings 4, II, I3, I1 and I3 are arranged symmetrically with respect to the divided chamber 6 so that faults in the working of the regulat-r ing diaphragm 3, in view of a difference of pressure, may be avoided as in similar known arrangements. If a pressure difference exists this diaphragm acts to 'one side as a throttling device and to the other side it increases the passage to greater quantities of fed fluid, thus en suring a very rapid restoration of equal pres- 'sures at both sides of the diaphragm.

`and that the amount of any possible differences may always be uniform as well.

By means of the plurality of pumps with setoff feeding elements or teeth the stream created and caused to flow to the regulating device will always be as uniform as possible, because there will not arise any`interruptions which would be of any 4practical importance.

Practical trials have shown that even in cases of high counter-pressures no changes in the feeding effect will arise, and certainly this effect is due to the setting of the feeding elements of 'the plurality of feeding pumps as well as to the symmetrical arrangement of the diaphragm with respect to the feeding and= discharge pipes and their openings controlled by the diaphragm.

- Having nowvpa-rticularly described and ascerdiaphragm being transversely movable in respouse to the differential pressure thereon to control the central inlet and the outletv ports, pump means, a conduit between said inlet opening and the intake side of the pump means, a supply conduit for theow medium connected to said rst mentioned conduit, a regulator device in the form of a gear pum-p, a conduit between the discharge side of the pump means and the inlet side of the regulator, a conduit between the discharge side of the pump means and the 'inlet side of the diaphragm near its periphery, a conduit betweenthe discharge side of the regulator and the outlet side of the diaphragm near its periphery. and a conduit from the outlet opening, said .pump means including a pair of gear wheel pumps the teeth of one pump being out of phase with the teeth of the other pump.

2. A device for uniformly delivering a medium comprising pumps, the rst of said pumps supplying the medium in excess to the second of said pumps; a diaphragm regulating means; an overow channel for the quantity in excess arranged ibetween the said pumps which connects to an inlet port of said ilrst pump and the diaphragm regulating means;1 said diaphragm regulating means comprising a casing, a diaphragm, and i'nlet and outlet ports provided in the walls of the said diaphragm regulating means, the said. inletv port of said means being connected with the said inlet port of vsaid first pump, and the outlet port being connected with the outlet p ort of said second port, the said overilow channel 'passing the diaphragm at the inlet port so as to exert pressure on the said diaphragm which is adapted by its deflection under this pressure to control the outlet of the said diaphragm regulating means; and a conduit connected to the said outlet port of said diaphragm means so as to exert pressure on the said diaphragm which is adapted under this pressure by its deflection 'in the other direction to control the inlet port of said diaphragm means and the said passage way ofthe said overiiow channel.

3. A'ow quantity regulating system comprising a casing having central inlet and outlet openings in opposite walls thereof, a diaphragm in said casing disposed hetweensaid walls, said diaphragm being transversely movable in resp'onse to the diierential pressure thereon to control the central inlet and the outlet ports, pump means, a conduit between said inlet opening and the intake side of the pump means, a supply conduit for the ow medium connected to said rst mentioned conduit, a regulator device of lesser capacity than the output of the pump means, a conduit between the discharge side of 'the pump means and the inlet side of the regulator, a conduit between the discharge side of the pump means and the inlet side of the dlaphragm near its periphery, a conduit between the discharge side of the regulator and the outlet side of the diaphragm near its periphery, and a conduit from the outlet opening, said pump means including a gear wheel pump.

JOHANNES VAN DARTELEN.

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