DE1653426A1 - Electromagnetic oscillating armature pump - Google Patents

Description

The invention relates to an electromagnetic oscillating armature pump with an exciter part and a piston pump provided with a suction and pressure valve ", the piston of which is made of magnetizable material exists and against the action of a helical spring closes the interrupted magnetic positive synchronously with the excitation frequency and opens.

In the known pumps of this type is located in the oscillating piston a non-return valve, which is used when the medium is conveyed closed iat and a check valve, either in the suction line or in the pressure line »depending on whether the oscillating armature

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ORIGINAL INSPECTED

pump is used as a suction pump alone or as a pressure pump. % In order to achieve a particularly good suction capacity, efforts are made to clear the dead space between the oscillating piston and the non-return valve with these pumps to keep it as small as possible.

The characteristic of these pumps is that at low pressure a large stroke of the piston takes place and at high pressure the The piston makes a very small stroke to the point where the pressure is so high that the piston is practically delivering SuIl reached. The regularity of this characteristic is similar a hyperbola. Because the medium to be conveyed is almost incompressible is, for example, according to its characteristics at high pressure, the piston executes a very small stroke, as mentioned above, and pushes a correspondingly small amount of the medium out against the column resting on the pressure check valve «The stroke of the piston depends on the counter pressure (oil column above the check valve or working pressure) and the stored work capacity in the piston, be it that the stroke is carried out by the electrical energy or by the energy of the spring, which was previously was preloaded by the electrical energy during the stroke of the piston

The way described above to keep the dead space as small as possible and the characteristics described lead to inclusion of air bubbles in the pumped medium, the pump no longer delivers. The dead space is filled with air and the ability to work

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OWGlNAL INSPECTED

of the piston is consumed during the stroke by the compression work of this air, so that the dead space at the end of the compression stroke Although it is filled with compressed air, the necessary final pressure is no longer reached to counteract the check valve and to promote the ulcer that weighs on it.

These air bubbles cannot be avoided in oil extraction systems because, on the one hand, from a certain suction height onwards, the dissolved air in the oil is in the form of bubbles is eliminated and, on the other hand, leaks occur during installation that allow air to enter during the suction stroke «.

The invention is now based on the object of a pump of the above mentioned genus in such a way that such inevitable Air pockets do not cause the pump to fail. According to the invention, this is achieved in that the pressure check valve no longer completely closes the pressure line, but preferably through a groove or hole either in the check valve or through the seat, on purpose is made "leaky". In addition, in the suction line, just below the reciprocating piston, a second non-return valve is arranged, which the line in contrast to the upper non-return valve seals tightly.

When an air bubble enters, the following happens: The oscillating piston compresses the air as described above his working capacity ms to some pressure. If this pressure is below the required delivery pressure, the flow through the

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wrote groove or bore oil back into the dead space, so that sioh this refills with oil after a number of strokes. The dead space is then no longer just filled with air and this during compression Air-oil mixture, the corresponding delivery pressure is reached again and both air and oil are pumped into the system. The lower additional check valve has according to the invention the task of creating a second pressure chamber between the piston and this check valve during the working stroke of the piston both oil can flow under pressure into the upper dead space through the check valve in the piston, and on the other hand any additional air bubble / jko ^ P ^ iniiß ^ t and part in the upper Lets dead space flow.

Through these two punctures that work together:

1. the return flow of the oil through the throttle point,

2. the possibility of compression under the piston

a temporary unavoidable air flow is guaranteed.

The invention is based on the drawing, which one Shows a longitudinal section through an embodiment of the invention, explained in more detail.

The oscillating armature pump consists of two E-shaped sheet metal packages 1 and I ¹ with the same section. The middle pair of legs 2 and 2 'is shortened, creating an air gap 3 in the middle of the laminated core. The excitation coil 13 is arranged between the legs. The middle pair of legs is provided with a longitudinal bore. By

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a complete pump unit is pushed through this longitudinal bore, which has a thin-walled ^ ylinder tube 4 in which the pierced Piston 5 runs, which consists of magnetizable material. This piston is pressed into the rest position by a helical spring 6.

A pressure valve 7 is built into the piston on the side opposite the helical spring. The two ends of the tube 4 are closed by two end pieces 8 and 8 ». Check valves 9 and 9 ¹ are located in these end pieces. At the same time, they are provided with threads for the suction or pressure line connection. ^x m the upper end piece 8, the pressure check valve 9 is bypassed by a throttle bore 10, whereby the upper dead space 11 and the pressure line 12 are in connection. The suction check valve 9 ^{1 is} installed in the lower end piece 8 ′. The inserted pump is supported by two yoke plates 14 and 15> the two

/ Ii un-l 17
Press rings, held by screws 18

Ö8! (3! NAL INSPECTED

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Claims (1)

Claims x [T J Electromagnetic oscillating armature pump with an exciter part and a piston pump equipped with a suction and pressure valve, whose piston is made of magnetizable material and, against the action of a helical spring, closes and opens the interrupted magnetic flux synchronously with the excitation frequency, characterized! that the upper dream (11) of the pump is in communication with the pressure line (12) via a throttle point (10) 2 «Electromagnetic oscillating armature pump according to claim 1, characterized characterized in that under the piston (5) by installing an additional check valve (9 ') itf. the suction line second compression space is formed " 3 · Electromagnetic oscillating armature pump according to claims 1 and 2, characterized in that a bore is used as the throttle point (10) or Kut in the valve housing or the valve body of the check valve (9) serves « 4 »Electromagnetic oscillating armature pump according to claims 1 and 2, characterized in that a throttle point through appropriate shape of the non-return valve (9) formed leak serves « 109836/0259