DE202006014665U1 - Motor-driven stirrer has sealing system on shaft which slides down to seal sample container which is evacuated during stirring - Google Patents

Abstract

A motor-driven stirrer has a sealing system on the shaft (8) which slides down to seal the sample container which is evacuated during stirring.

Description

The The invention relates to a dispersing device with a motor, a by the motor driven shaft with a stirring tool, a container for Picking up a dispersing material and the stirring tool and a sealing system for sealing the container across from the wave for the "expressing" of the dispersing material. With these expressions the dispersing material is expressed through a closable opening in the container. Of the Dispersing process can be done with and without beads, with beads especially for the fine grinding can be used.

• 1. Die Benetzung der Oberfläche des einzuarbeitenden Feststoffes durch flüssige Bestandteile des Dispergiergutes;
• 2. die mechanische Zerteilung von Agglomeraten in kleinere Agglomerate und Primärartikel und
• 3. die Stabilisierung von Primärartikeln, Agglomeraten und Aggregaten gegen erneute Zusammenlagerung (= Floc-kung).

By such a device, a distribution of fine and feinstteiligen solid components in the liquid phase is achieved. In the dispersing process, three partial steps run side by side:

• 1. The wetting of the surface of the incorporated solid by liquid components of the dispersion;
• 2. the mechanical fragmentation of agglomerates into smaller agglomerates and primary articles and
• 3. the stabilization of primary articles, agglomerates and aggregates against re-assembly (= floc-kung).

To the dispersing, the interior of the container is pressurized, around the product located between the grinding beads (dispersing material) expel. For sealing the shaft with respect to the housing is in known dispersing devices an expensive mechanical seal with a barrier fluid and an associated cooling system intended. Occasionally, a cheaper lip seal comes to Use, however, during of the operation get very hot can and therefore burns when touched by a user can cause.

There The mechanical seals permanently run, they are without a cooling very hot. consequently have to the systems cooled and are therefore relatively expensive, e.g. EUR 2,000, - up to 3,000, - at a speed of 20,000 rpm. They are therefore also subject to them a relatively high wear. Further needed the mechanical seal a significant torque of engine power to the occurring resistances to overcome the sealing system.

alternative to the mechanical seal can Also radial shaft seals can be used without cooling. These Sealing systems can due to the permanent running and the occurring heat with a risk of burns for be connected to the user, especially in fast-running Machines with a peripheral speed of up to 20 m / sec.

Of the Invention is the technical problem underlying a generic dispersing device continue to develop so that the aforementioned disadvantages, at least partially avoided. At the same time, the dispersing device have a simple structure, inexpensive and easy to maintain be.

According to the invention this in a dispersing device of the type mentioned by solved, that the sealing system comprises a sealing element that only for the Duration of the evacuation from a rest position in a sealing position can be transferred. The seal can for a the pressurization when "expressing" the Dispersiertguts be used. About that but she is also for the purposes of "evacuation" can be used.

Thus, according to the invention the known from the prior art permanent seal one for replaced the duration of the evacuation switchable seal. Since that Sealing element is only connected as needed, this has thus also a longer one Lifespan. Since waived a permanent mechanical seal is, the system is opposite the state of the art much cheaper, smaller and more filigree. The sealing system according to the invention is not just for the Pressurization for the above-described "squeezing" of the dispersing suitable, but also for the "evacuation" with a negative pressure, to expel air in the dispersion or regrind and to obtain an air-free product.

In the simplest variant, the sealing element can be switched by hand and thus very small and compact. In an alternative training for larger devices can the connection of the sealing element via an electric motor, preferably a servomotor, which in a preferred embodiment can also be timed.

The sealing system according to the invention is both for Systems with vertical shaft as well as with horizontal shaft usable, but preferably for Floor models with vertical shaft. Preferably, the sealing element has a Radial shaft seal on, allowing for an existing standard component resorted can be. The sealing system is both in dispersing device usable with pearls as well as without pearls.

Preferably, the sealing element is by means of a linear gear axially along a shaft axis from the rest position to the sealing position movable. In the particularly preferred embodiment, when using a radial shaft seal as a sealing element this is simply pushed onto a sealing seat in the sealing position.

A Particularly simple training is feasible when the linear gear a rotatable ring bushing with a in a lateral surface of this ring bushing formed groove with a slope (slope groove) includes, in which is guided a pin connected to the sealing element. By turning the ring bush, the pin runs in this groove and thus causes the desired Axial displacement of the sealing element.

Especially easy to use is the system, if in the case of a manual activity the sealing system automatically after releasing by the user is decoupled.

It has proven to be particularly advantageous on the sealing system to provide a display device with which the rest position and the sealing position from the outside easily recognizable to the user is. When using the aforementioned ring bush this can for Example be done by that below the rotatable ring bushing colored red and green marked sections are formed. When exposing this red marked section through the ring bush, this is located in the sealing position; when exposing the green section, however, in the resting position.

Further Details, advantages and features of the invention can be the refer to the following part of the description, in which a preferred embodiment the dispersing device according to the invention closer to the drawing explained becomes. Show it:

1 a side view of the dispersing device according to the invention, partly in cross section ,;

2 an enlargement of the section A according to 1 with the sealing system in rest position; and

3 the enlargement of the section A according to 1 with the sealing system in sealing position.

Same or equivalent parts are provided with the same reference numerals.

Accordingly, the dispersing device according to the invention consists of one in one foot 2 used, vertically extending stand 4 , at the upper end of an electric motor 6 height adjustable is attached. The electric motor 6 drives a vertically extending wave 8th at, at the lower end of a trained by two axially spaced annular disks agitating tool 10 is arranged. This stirring tool 10 runs in a container 12 that has a crossbar 14 on the stand 4 is attached. A sealing ring inserted into the upper container opening in a sealing manner 16 extends vertically from the container 12 around the shaft 8th to a sealing system 18 , which is below the electric motor 6 on an upper flange 20 is attached. A guide bush 22 connects the lower shaft protection tube 16 on the outside with the upper flange 20 , This guide bush 22 has a groove in its lateral surface 24 with a slope up. The outer side encloses the guide bush 22 a locking bush 26 which is rotatable relative to the guide bushing 22 , Two diametrically opposed threaded pins 28 . 30 connect the locking socket 26 with a sealing bush 32 placed on the inside of the guide bush 22 between the lower shaft protection tube 16 and the flange 20 is arranged. Between the lower shaft protection tube 16 and the flange 20 is provided an axial clearance, so that the sealing bushing 32 is axially displaceable.

The movement of the sealing bush 32 from the in 2 illustrated resting position in the in 3 shown sealing position is achieved by a rotation of the locking sleeve 26 causes. During the rotation of the locking bush 26 be the grub screws 28 . 30 so guided in the groove of the guide bush that the sealing bushing 32 raising.

The sealing bush 32 has on its inside a paragraph for receiving a radial shaft seal 34 on. When lifting the sealing bushing 32 pushes this radial shaft seal 34 sealing on the outer circumferential surface of a cylindrical shaft sleeve 36 , by means of several offset threaded pins 38 outside on the shaft 8th is attached. Outer side on the upper end of the shaft sleeve 36 is a pump 42 screwed to the realization of the explosion protection laws.

The shaft protection sleeve 36 has at its lower end on the inside an annular groove for receiving an O-ring 40 on which the shaft sleeve 36 opposite the wave 8th seals.

To move the Dichtungssytems from the rest position according to 2 in the in 3 shown sealing position only has the locking bushing 26 to be turned around. This will be the sealing bushing 32 with the radial shaft seal 34 raised so that it seals on the outer surface of the shaft sleeve 36 seated. Thus, the interior of the housing 12 sealed for evacuation.

The guide bush 22 has at its lower end on the outside a red-painted groove 44 on, in the rest position through the locking socket 26 is covered. One at the top of the guide bush 22 externally formed, green painted groove 46 On the other hand, it is free in the rest position and symbolizes the rest position of the sealing system for the operator. The rotational movement of the locking bush 26 on the other hand, the red painted groove lays 44 free and signals to the user that the sealing system is in the sealing position.

Of the The subject of the present invention is not exclusive the subject of the individual claims, but from the combination the individual claims among themselves. All information and characteristics disclosed in the documents, in particular the spatial illustrated in the drawings Training are claimed as essential to the invention, as far as they are individually or in combination over the prior art new are.

2

foot

4

stand

6

electric motor

8th

wave

10

agitator

12

container

14

crossbeam

16

lower Shaft protection tube

18

sealing system

20

flange

22

guide bush

26

Arretierungsbuchse

28

Set screw

30

Set screw

32

sealing bush

34

Radial shaft seal

36

Shaft sleeve

38

Set screw

40

O-ring

42

impeller

44

red lacquered groove

46

painted green groove

Claims (8)

Dispersing device with a motor, a shaft driven by the motor ( 8th ) with a stirring tool ( 10 ), a container ( 12 ) for receiving a dispersing material and the stirring tool ( 10 ), a sealing system for sealing the container ( 12 ) opposite the shaft ( 8th ), Characterized in that the sealing system comprises a for the duration of the evacuation from a rest position into a sealing position switchable sealing element. Dispergiervorrichtung according to claim 1, characterized in that the sealing element is a radial shaft seal ( 34 ). Dispersing device according to one of the preceding Claims, THEREFORE CHARACTERIZED that the sealing element by means of a Linear gear axially along a shaft axis from a rest position is movable in a sealing position. Dispergiervorrichtung according to claim 3, characterized in that the linear transmission, a rotatable locking bushing ( 26 ) comprising a pitch groove formed in a lateral surface, in which a pin connected to the sealing element ( 28 . 30 ) is guided. Dispersing device according to one of the preceding Claims, This indicates that the sealing system can also be operated manually and automatically released after releasing. Dispergiervorrichtung according to any one of claims 3 or 4, characterized in that the linear gear by means of a Electric motor is operable. Dispersing device according to one of the preceding Claims, THAT CHARACTERIZED that the sealing system is a display device to indicate the rest position and the seal position. Dispersing device according to Claim 7, characterized *** in that the display device comprises differently marked rings of color with a first color for the rest position and a second color for the sealing position, and in that the rings are alternately inserted through the locking bushing (Fig. 26 ) are coverable and exposable to indicate whether the seal system is in the rest or seal position.