DE102005048765A1 - Oscillating anchor pump used in household appliances, e.g. coffee machines comprises a sliding surface formed as a sealing surface for sealing the cylinder of a pump housing during axial displacement of a plunger using a sealing element - Google Patents

Abstract

Oscillating anchor pump (1) comprises a sliding surface formed as a sealing surface for sealing the cylinder of a pump housing (2) during axial displacement of a pump plunger using a sealing element. Independent claims are also included for the following: (1) Pump plunger for the above pump; (2) Pump housing for the above pump; and (3) Method for the production of an oscillating anchor pump. Preferred Features: The sealing and sliding surface is produced by deep drawing in the axial direction. The pump plunger is mounted in the pump housing so that it does not twist.

Description

The The invention relates to a vibration pump according to the preamble of Claim 1.

An oscillating armature pump is for example in the document EP 0 288 216 B1 described. In this document, a two-part composite piston is described with a part of a ferromagnetic, metallic material and a part of a non-metallic and non-ferromagnetic material.

Vibration pumps are characterized by a vibrating in a movement axis back and forth Pump piston, at least partially made of magnetic or consists of magnetizable material and an electromagnetic Coil is driven.

Of the Piston of a vibration tank pump displaces when immersed in a Cylinder a fluid therein. When extending out of the cylinder is this over a bore of the pump piston refilled with fluid, so that cyclic pumping while the oscillation of the pump piston can take place.

By This operation requires the interior of the cylinder to make fluid-tight. This seal must be in every position of the piston ensured which is why usually one sliding surface as a sealing surface is formed, this sealing function also in the axial movement the piston perceives.

at Known oscillating armature piston is this sealing and sliding surface on the Outer peripheral surface of Piston provided in the axial movement of the piston to a stationary Seal along slides. So far, such pump piston machined. To ensure a permanent sealing function is therefore a time-consuming post-treatment required to have circumferential structures, for example, at a production be produced as a turned part to smooth.

task The invention is to propose a vibrating armature pump, at this expense can be eliminated.

Accordingly is characterized by an oscillating armature pump according to the invention according to the generic term of claim 1 characterized in that the sealing and sliding surface by a machining is made in the axial direction.

By the machining in the axial direction ensures that any Surface structures in the Area of the sealing and sliding surface in the axial direction. When applying an elastic seal Such a seal forms on such surface structures at. Because of these possibly existing manufacturing structures run in the axial direction, takes place during the movement of the pump piston in the axial direction no further deformation of the adjacent sealing element instead of.

On this way it is possible the production costs for an oscillating armature pump according to the invention while still a long life with low Wear too guarantee.

A according to the invention and sliding surface can be made for example by deep drawing in the axial direction become. In this way, a production in large numbers with little effort possible. In particular, a post-processing of the sealing and sliding surface either completely eliminated or at least significantly reduced.

In a particular embodiment According to the invention, the cylinder comprises the sealing and sliding surface. In In this case, the sliding on the sealing and sliding surface sealing element firmly attached to the piston.

In a preferred embodiment the invention, however, the sealing and sliding surface on the pump piston arranged and the associated sealing element stationary on the pump housing or arranged on the cylinder.

advantageously, is inside the pump piston, a fluid passage for filling the Cylinder provided which is closable with a check valve. Such a check valve can be formed for example by a spring-loaded valve body be supported against a compression spring in the pump cylinder.

Of the Cylinder is advantageously opposite to the pump piston Page with a passage for provided the fluid which is also closed by a check valve. This check valve can basically identical to the check valve for the Closure of the piston passage are formed.

In order to make full use of the wear-reducing design of the sealing and sliding surface according to the invention, the piston is preferably mounted against rotation in the oscillating armature pump, so that it is preferably fixed in its angular position only in the axial direction. For this purpose, for example, appropriate guide elements before can be seen, however, should be spaced in the axial direction of the sealing and sliding surface.

In an advantageous embodiment invention, the pump piston is formed at least in two parts, wherein a dipping into the cylinder piston part and a via a Magnetic field influencing magnetic part is provided.

The the sealing and sliding surface having piston part is thereby smaller than this one-piece Piston would be the case and thus with less effort and higher precision according to the invention, for example can be produced by deep drawing. In contrast, a simple base body, for example, for the magnetic part a pipe is chosen become. As a result, a large magnetic mass is available with little effort, the only with the piston part, the pumping and sealing function guaranteed to connect.

The Connection of the two parts, for example, by caulking, rolling, clamping, pressing, gluing, welding, shrinking or by other types of production.

The Magnetic part can be designed as an attachment or use for the piston part be so that both parts before attaching the above Art are plugged into each other, whereby the assembly is facilitated.

In a particular embodiment the pump piston comprises a front-side centering element. By a frontal centering can facilitate the assembly and a centric and axial course of the pump movement without major circumferential Wall contact low-friction and tip over can be realized.

In a development of this embodiment if two centering elements are attached on both sides of the magnet part, for a better leadership of the To cause pump piston.

One Centering can, for example, as an annular shoulder in the magnetic part be formed, which can serve as a stop for a compression spring at the same time. Such an annular shoulder is circumferentially or within a hole conceivable.

In of the embodiment described above the compression spring at the same time as a guide element for the centered and axis-parallel movement of the pump piston serve. In the above mentioned embodiment with arranged on both sides of the magnet part centering these can again on both sides as an annular shoulder with stop for compression springs be designed. This not only benefits in the Regard to the leadership the pump piston, but a two-sided spring mounting means Pressure springs leads about that out to a low-noise Run the pump without audible Stop at one or both dead centers.

at Using a compression spring as a guide, this example simultaneously over a suitable attachment to the pump housing on the one hand and on the pump piston on the other hand also for a rotationally secure angular position of the pump piston can be used, to the advantages of the invention to fully use in the manufacture of the sealing and sliding surface.

In an advantageous embodiment The invention is followed by the dipping into the cylinder Piston part of the pump piston, a transverse bore provided to the caused by the fluid flow resistance when swinging to reduce the pump piston. That way you can to improve the efficiency of the vibration tank pump according to the invention.

Inventive Schwingankerpumpen come increasingly in home appliances, like vending machines, Coffee machines, egg cookers or the like for use. Your application However, this is not limited by this. They can be used everywhere where a space-saving, low-noise and electrically easily controllable pump is needed. She offers all the advantages a piston pump, in particular, is in communication with the check valves ensures compressive strength even in the de-energized state.

One embodiment The invention is illustrated in the drawing and is based on the Figure closer below explained. In detail shows

1 a longitudinal section through an oscillating armature pump according to the invention.

The vibration tank pump 1 according to the 1 includes a two-piece pump housing 2 at a yoke 3 an electromagnetic coil 4 through a screw connection 5 is attached.

The pump housing 2 includes a tubular anchor receptacle 6 that go into the interior of the coil 4 is plugged in and a cylinder part 7 that has a flange 8th at the yoke 3 is applied.

The anchor seat 6 is frontally with an annular shoulder 9 provided so that about tightening the screw 5 both parts 6 . 7 of the pump housing 2 on the one hand with the yoke 3 or the coil 4 attached and to each other get connected.

A pump piston 11 is in the pump housing 2 inserted and includes a piston part 11 as well as a magnetic part 12 , The piston part 11 is tubular with an axial passage and immersed in a cylinder 13 one in the cylinder part 7 is trained. The cylinder 13 is towards the magnet part 12 over a ring seal 14 sealed, which in this case consists of two nested sealing rings. An O-ring is used for the elastic pressure radially inward, while an annular surface seal for the tight seal against the piston part 11 provides. The piston part 11 is on the outer circumference for this purpose with a sealing and sliding surface 15 Mistake. The pump piston 10 and thus also the piston part 11 perform cyclic axial displacements in operation in the direction of the double arrow A, ie it oscillates periodically in the axial direction back and forth.

At the magnet part 12 opposite side is the cylinder 13 through a crossbar 16 closed, which has a central passage opening 17 having. The piston side is supported on the cross bar 16 a compression spring 18 starting with a sealing body 19 on the outlet of the tubular piston part 11 suppressed.

On the piston 11 opposite side of the crosspiece 16 is the cylinder part 7 elongated tubular and forms at its outer end the pressure-side connecting piece 20 the vibration tank pump 1 , A support ring 21 is in the connecting piece 20 inserted and forms a stop for another compression spring 22 that is a sealing body 23 to the crossbar 16 presses while the through hole 17 closes.

The pump piston 10 is starting from the piston part 11 towards the magnet part 12 provided with a two-stage cross-sectional widening. To the piston part 11 with small cross-section thus closes an intermediate part 24 with medium cross section and the magnetic part 12 with a large cross section. In the middle part 24 is a cross hole 25 attached to the axial passages 26 . 27 of the piston part 11 on the one hand and magnetic part 12 on the other hand.

A first compression spring 28 encloses the intermediate part 24 and relies on the gradation to the magnet part 12 with large cross-section on one side. On the opposite side is the compression spring 28 on a stop disc 29 supported between the anchor seat 6 and the cylinder part 7 of the pump housing 2 is used.

On the piston part 11 opposite side has the magnetic part 12 a gradation on which is an annular shoulder 30 forms. A second compression spring 31 encloses the extension formed by the gradation 32 and rests on the ring shoulder 30 from. On the opposite side of the compression spring 31 this is due to a gradation 33 the anchor seat 6 at. The anchor seat 6 is out of the coil 4 extends out and forms at its end a connector grommet 34 for connecting a supply line.

The vibration tank pump 1 works as follows.

By applying the coil 4 with alternating current is the pump piston 10 oscillated in the axial direction A. He oscillates periodically to one by the springs 28 . 31 and optionally also the compression spring 18 defined neutral position.

Upon penetration of the piston part 11 in the cylinder 13 will that be in the cylinder 13 displaced fluid displaced. This closes the sealing body 19 the exit opening of the axial passage 26 in the piston part 11 from. That in the cylinder 13 As a result, fluid located seeks its way through the passage opening 17 of the crossbar 16 in the connecting piece 20 , wherein the sealing body 23 against the pressure of the compression spring 22 from the passage opening 17 is pushed away by the pressurized fluid.

When swinging back the pump piston 10 in the opposite direction, the piston part pulls 11 out of the cylinder 13 back. That in the cylinder 13 Residual fluid is thereby relaxed and placed in the subsequent sequence under negative pressure. As a result, the passage opening 17 by means of the compression spring 22 and the sealing body 23 locked. The compression spring 22 and the sealing body 23 form a check valve, through which the return flow of the once in the area of the connecting piece 20 reached fluid is prevented.

During the retraction of the piston part 11 forms in the cylinder 13 a negative pressure, which causes the sealing body 19 from the exit of the axial passage 26 lifts off, allowing fluid through the passage 26 in the cylinder 13 nachströmt. The liquid or gaseous Fuid passes over the inlet nozzle 34 inside the anchorage 6 as well as through the axial passage 27 of the magnetic part 12 for axial passage 26 of the piston part 11 ,

After the cylinder 13 in the backward movement of the piston part 11 is filled, that is in the cylinder 13 located fluid in the forward movement of the piston member 11 turn out of the cylinder 13 through the passage opening 17 repressed.

In the illustrated embodiment, the magnetic part is located 12 with its large cross section close to the inner wall of the anchor seat 6 , The oscillation movement of the pump piston 10 However, requires the cyclic filling and emptying of the interior of the anchor receptacle 6 on both sides of the magnet part 12 , As in this embodiment of the magnetic part 12 only a very small gap between the magnetic part 12 and inner wall of the anchor receptacle 6 is present, is located in this embodiment, the transverse bore 25 in the intermediate area 24 , allowing unimpeded fluid flow from one side of the magnet part 12 is guaranteed to the other and vice versa.

The function of the cross hole 25 However, it can also be otherwise, for example by longitudinal bores or notches in the magnet part 12 be realized. However, the present embodiment offers the advantage of a large magnetic mass in the range of effect of the coil 4 ,

Due to the double-sided spring mounting of the pump piston 10 by means of the compression springs 28 . 31 During springing to each dead center in the axial movement, a spring-loaded reversal of the movement takes place so that no hard stop takes place. This results in a very quiet running of the pump. In addition, this arrangement is a mechanically oscillatory system, so that less energy from the coil 4 is required to keep the mechanical components of the oscillating armature pump in vibration.

By supporting the compression springs 31 . 28 at the respective gradations of the pump piston 10 form the compression springs 28 . 31 in connection with the extension 32 or the intermediate part 24 Center section at the same time centering for the pump piston 10 ,

As can be seen from the above functional description, manufacturing technology is the on the outer circumference of the piston part 11 located sealing and sliding surface 15 great demands on the surface property to ensure a permanent tightness without major wear of the ring seal 14 to enable.

In conventional machining of this sealing and sliding surface 15 arise in the production annular structures on the surface, in the axial sliding movement in the installed state, the seal 14 strain.

According to the invention now at least the sealing and sliding surface 15 comprehensive part 11 of the pump piston 10 produced by machining in the axial direction, for example by deep drawing. Production-related surface structures thus run in the axial direction, to which the ring seal 14 Although once must adapt, as a result of the axial movement A of the sealing and sliding surface 15 However, no longer appreciably affected.

Thus, by the production according to the invention is a production of the oscillating armature pump 1 With little effort and a long service life possible.

The pump piston 10 can be carried out in several parts without further notice. The interface between the different parts can be before or after the intermediate part 24 be provided. The connection between the individual parts can be made in various ways, already mentioned above types.

In a multi-part design of the pump piston 10 there is still the possibility of different material selection between magnetic part 12 and piston part 11 , The material selection at the piston part 11 can thus be selected with regard to the sealing function, wherein the magnetic properties play a minor or no role. For this part of the pump piston 10 Accordingly, magnetic or non-magnetic materials can be used as needed.

It is essential, however, that in the magnetic part 12 in the immediate area of effect of the coil 4 a sufficiently large mass of magnetic material is arranged. To the material of the magnetic part 12 no appreciable properties in terms of tightness of the pump are made, so that at this point, for example, a choice of materials in terms of efficiency or the performance of the pump can be made. In addition, the two- or multi-part design of the pump piston offers 10 in the area of the magnetic part 12 the possibility of a simple production, for example by cutting to length of the magnetic part 12 from a pipe section with a corresponding diameter and axial passage 27 Made of suitable magnetic or magnetizable material.

1

The vibration pump

2

pump housing

3

yoke

4

Kitchen sink

5

screw

6

anchor recording

7

cylinder part

8th

flange

9

annular shoulder

10

pump pistons

11

piston part

12

magnetic part

13

cylinder

14

ring seal

15

sealants and sliding surface

16

crosspiece

17

Through opening

18

compression spring

19

sealing body

20

spigot

21

support ring

22

compression spring

23

sealing body

24

intermediate part

25

cross hole

26

axial passage

27

axial passage

28

compression spring

29

stop disc

30

annular shoulder

31

compression spring

32

extension

33

gradation

34

connection nozzle

Claims (15)

Vibrating anchor pump having a pump housing, which comprises a cylinder for receiving a pump piston, and having a sealing surface designed as a sealing surface for sealing the cylinder during axial displacement of the pump piston by a sliding on the sealing and sliding surface sealing element, characterized in that the sealing and sliding surface ( 15 ) is made by machining in the axial direction. Vibrating anchor pump according to claim 1, characterized in that the sealing and sliding surface ( 15 ) is made by deep drawing in the axial direction. Oscillating pump according to one of the preceding claims, characterized in that the cylinder ( 13 ) comprises the sealing and sliding surface. Oscillating tank pump according to one of the preceding claims, characterized in that the pump piston ( 10 ) the sealing and sliding surface ( 15 ). Oscillating tank pump according to one of the preceding claims, characterized in that the pump piston ( 10 ) against rotation in the pump housing ( 2 ) is mounted. Oscillating tank pump according to one of the preceding claims, characterized in that the pump piston ( 10 ) is at least in two parts, with one in the cylinder ( 13 ) immersed piston part ( 11 ) and a magnetic part which can be influenced by a magnetic field ( 12 ) is provided. Oscillating tank pump according to one of the preceding claims, characterized in that the magnetic part ( 12 ) as an attachment or insert for the piston part ( 11 ) is trained. Oscillating tank pump according to one of the preceding claims, characterized in that the pump piston ( 10 ) a front-side centering element ( 30 ) having. Oscillating tank pump according to one of the preceding claims, characterized in that the pump piston ( 10 ) is spring loaded. Oscillating pump according to one of the preceding claims, characterized in that as centering an annular shoulder ( 30 ) is provided, which at the same time as a stop for a compression spring ( 31 ) is trained. Oscillating tank pump according to one of the preceding claims, characterized in that the pump piston ( 10 ) on both sides of the magnetic part ( 12 ) is spring loaded. Vibrating anchor pump according to one of the preceding claims, characterized in that a transverse bore ( 25 ) in the pump piston ( 10 ) is provided as a fluid passage. Pump piston for a vibration pump with a cylinder for receiving the pump piston, which comprises a sealing surface designed as a sealing surface for sealing the cylinder during axial displacement of the pump piston by a sliding on the sealing and sliding surface sealing element, characterized in that the sealing and sliding surface ( 15 ) is manufactured by machining in the axial direction. Pump housing for a vibration pump, which comprises a cylinder for receiving a pump piston, and provided with a sealing surface designed as a sealing surface for sealing the cylinder during axial displacement of the pump piston by a sliding on the sealing and sliding surface sealing element, characterized in that the sealing and sliding surface ( 15 ) is manufactured by machining in the axial direction. A method for producing a vibration pump with a pump housing, which comprises a cylinder for receiving a pump piston and is provided with a sealing surface designed as a sealing surface for sealing the cylinder during axial displacement of the pump piston by a sliding on the sealing and sliding surface sealing element, characterized in that the Sealing and sliding surface ( 15 ) is manufactured by machining in the axial direction.