EP2016287B1 - Rotary piston machine - Google Patents

Description

State of the art

The invention is based on a rotary piston machine according to claim 1. A generic rotary piston engine is off DE 199 62 804 A1 known, which shows the features of the preamble of claim 1 and is considered to be the closest prior art. A considerable problem in the generic field of pumps and compressors always arises when the substances to be conveyed are toxic substances which are also tough or can only be conveyed at high temperatures, which makes the cleaning of the rotating parts very demanding. make it difficult or even impossible. There are also decision problems in comparing the values of the substances to be conveyed with the value of the machine and possibly the replacement thereof. This is especially true when used for pharmaceutical substances, but also for certain, usually under high temperature to be promoted plastics. A considerable Problem is the cleaning of the pump parts. This is also the case that when using cleaning acids or the like. the pump parts must be resistant accordingly. Again, the remainder of the pump's remaining space, ie the damaging spaces, should be as small as possible, and should approach zero if possible. In practice, attempts are made to counteract this by using stainless steel or expensive resistant materials for the rotary lobes.

The problem underlying the invention

The invention is based on the object in a rotary piston engine of the generic type, in particular by overcoming the bias of the art, a Einsatz-, or manufacturing process, or to develop a special construction, via which such a rotary engine can be supplied to a wide range of uses.

The invention and its advantages

This object is achieved by a rotary piston machine according to the invention according to the main claim. Although it is known per se, in an electrically driven pump which flows through the stream the electrically controlled coil receiving, usually fixedly arranged complex housing part by means of a cup-shaped can of the rotating, the permanent magnet receiving power rotor to separate ( DE 603 00 780 T2 , respectively. AT 28 11 84 ), although there is a completely different problem, namely the cooling of electrical parts of such canned pumps and not, as in the invention, a cost-saving design by combining a disposable part provided as "cheap" pump head with a complex pump housing, which if necessary stationary. Important for the invention is that after releasing the pump head from the main body, the flow-through from the medium to be pumped working spaces are closed on the base housing side facing, so that, for example acids udgl. remain in the disposable part and can be disposed of with this. In the known canned motor ( DE 603 00 780 D2 and AT 28 11 84 ) immersed only the containment shell in the closed state of the pump in the electrically controlled winding, but the housing accommodating the current coil does not form a basic housing, so that when removing the electrically flowed through the coil receiving part of the pump head with respect to the media to be conveyed no longer closed is.

It is also known in a medical metering pump for liquid medication pump unit and motor or the operative connection between the motor and pump to make detachable, thereby, as far as the pump, to achieve a disposable disposable unit, which can be separated from the expensive drive unit (electric motor) so that the latter can be reused ( DE 199 16 876 A1 ). However, this is a peristaltic pump, in which the feature that the pump head is designed as a disposable part, is already removed, but it is neither a quick-release connection is, apart from the fact that, of course, such only by the delivery hose sealed to the outside pumps have a very narrow range of use and is related to the invention of a different type of pump.

According to an advantageous embodiment of the invention, the rotors have an interlocking Trochoidenverzahnung (cycloid toothing). Although such a rotary engine is known (see genus WO 05/024236 A1 ) with the great advantage that the remaining residual spaces of the pump, ie the harmful spaces, are very small, but with respect to the invention there is a considerable bias of the art for such trochoidal rotary piston machines, in particular with regard to utilization methods, production methods or construction.

The very difficult to be solved requirement of a zero-going harmful space are only little-known rotary engines justice ( DE AS 10 11 896 , NSU; WO 2005/024236 A1 , COR) by the teeth of the rotating parts are formed cycloid-shaped, or trochoidenförmig and engage by rounding the teeth sealingly without additional sealing means in the teeth of the other rotating part. In these known rotary engines, the harmful space can therefore be reduced to zero.

Although such a rotary engine with trochoidenförmig trained rotor has the advantage of low harmful space, but so does not solve the above problem, especially in the promotion of substances under high temperatures (plastics) or aggressive materials.

However, in contrast to the known pumps, trochoidal toothing is a complex precision pump whose design is unusual as a disposable part for a person skilled in the art, so that a bias in the art was to be overcome here.

The resulting from the problem underlying the invention, namely to form the existing Trochoidenteilen pump head as a disposable part and to connect it with the main body therefore with a Schnelllösverbindung, is unusual for the expert, with quick connections between the engine and special pumps in a variety of ways, such as mentioned above, are known.

An according to claim 1 to be designed rotary piston conveyor with cup-shaped canned to facilitate the replacement of the pump head is an additional step of thought, which is unusual because the flowed through from the substrate to be pumped pump head forms by its invention interchangeability no conceptual connection to the function of the known gap motor, because for the expert in the known pumps, the split tube during operation, the flowing medium to hermetically separate the electrical part of the pump part.

According to an advantageous embodiment of the invention, therefore, when replacing the pump head as a disposable part of the can with rotors and permanent magnet pulled out of the base housing, after which the replacement part is used.

In order to facilitate the exchange of the pump head according to the invention, according to one embodiment of the invention, the connection between the base housing and the pump head as a Quick coupling formed, which acts on corresponding devices of the base housing and pump head.

• dass sich die Vorrichtung zur Verbindung der Gehäuse von Grundgehäuse und Pumpenkopf an den sich berührenden Stirnflächen zwischen Grundgehäuse und Pumpenkopf befinden,
• dass die Gehäuse in dem sich berührenden Bereich einen einander zugeordneten äußeren Wulst oder Flansch aufweisen und
• dass die Gehäuse über einen diese Wülste oder Flansche übergreifenden, tangential verkürzbaren Ring axial zusammenspannbar sind.

A related advantageous embodiment of the invention is such,

• that the device for connecting the housings of the housing and the pump head are located at the contacting end faces between the base housing and the pump head,
• in that the housings in the contacting area have an associated outer bead or flange and
• in that the housings can be axially clamped together via a tangentially shortenable ring that overlaps these beads or flanges.

drawing

An embodiment of the object of the invention is shown in the drawing.

Fig. 1

eine erfindungsgemäße Drehkolbenförderpumpe in Explosionsdarstellung und im Längsschnitt;

Fig. 2

die Schnellschlussverbindung zwischen Grundgehäuse und Pumpenkopfgehäuse in der Draufsicht und

Fig. 3

die Drehkolbenförderpumpe entsprechend dem Schnitt A aus Fig. 2 in zusammengebautem Zustand.

Show it:

Fig. 1

a rotary piston pump according to the invention in an exploded view and in longitudinal section;

Fig. 2

the quick-release connection between the main body and pump head housing in the plan view and

Fig. 3

the rotary piston pump according to the section A from Fig. 2 in assembled condition.

Description of the embodiment

As in Fig. 1 shown in exploded view, the rotary piston pump according to the invention comprises a base housing 1, with which the pump is anchored correspondingly fixed and in which the electrically controllable coil 2 of an electric motor is arranged. In the right part of the exploded view, a pump head 3 is shown, which can be closed by a pot-shaped can 4. Between a flange-shaped portion 9 of the can 4 and a portion 9 of the can 4 facing flat end face 8 of the pump head 3, a ring seal 5 is disposed in a Stirnringnut 6 of the pump head 3. The pump head 3 has for this purpose an annular bead 7, on which the end face 8 is present and which serves to engage a clamping ring 10, on the other hand engages an annular bead 11 of the base housing 1.

The clamping ring 10 is open at 12 on one side and by a screw which is tangentially inserted into an opening 13, shortened in its scope. The clamping ring 10 also has conically extending webs 14, so that a shortening of the circumference of the clamping ring 10 and by its engagement with the annular beads 7 and 11 of the pump head 3 and the base housing 1 leads to their clamping together.

The pump head 3 receives a power rotor 15 with a permanent magnet 16 in a pot-shaped portion of the can 4, as well as a through the power rotor 15 with driven counter rotor 17 with the pivot bearing 18th

In Fig. 2 In particular, the clamping ring 10 is shown with its open side 12th

At the in Fig. 3 The version shown in the assembly and in longitudinal section is particularly well recognizable that after releasing the clamping ring 10 of the pump head 3 including the flow-through from the medium to be conveyed area separating can 4 in a simple manner from the base housing 1 and the electric coil 2 can be pulled out.

It should be noted that the invention is not limited only to canned machines, but also detects rotary piston machines, in which the seal between the exchanged pump head and the base housing is effected by other known means. Decisive is the simple and practical interchangeability of the pump head with separation of the flow medium.

LIST OF REFERENCE NUMBERS

1

Headers

2

Kitchen sink

3

pump head

4

canned

5

ring seal

6

Stirnringnut

7

Ring bulge of 3

8th

face

9

flange

10

clamping ring

11

Ring bulge of 1

12

open page of 10

13

opening

14

Stege

15

performance rotor

16

permanent magnet

17

against rotor

18

pivot bearing

Claims (2)

1. Rotary piston machine working as a pump or compressor, having a driven, trochoidally toothed power rotor (15), having a counter rotor (17) which engages into the toothing and is thus correspondingly toothed, having a working chamber which is arranged between the rotors, having a pump drive device (2, 16), having a base housing (1) which accommodates parts of the pump drive device (2), having a pump head (3) which supports the counter rotor (17) axially and radially, and having a releasable connecting device (10) between the base housing (1) and the pump head (3), wherein the power rotor (15) is part of a canned motor having a can (4), in that the can (4) extends with a radially extending section (4) between mutually facing sides of the base housing (1) and the pump head (3), and in that the pump drive device (2, 16) is divided by the can (4) into a magnet part (16) which is arranged in the power rotor (15) and into a coil part (2) which is arranged in the base housing (1) and through which current flows, wherein the device (7, 11) for connecting the base housing (1) and the pump head (3) is situated in the region of the end faces (8) which are in contact, in that an outer bulge (7, 11) or flange, assigned to one another, is present in the region of contact, and in that said bulges (7, 11) or flanges are able to be clamped together axially via a ring (10) which engages over them and which is able to be shortened tangentially,
   characterized in that the ring (10) is formed as a clamping ring (10) which is outwardly curved in section and which is open on the circumference at a point (12), said ring having radial webs (14) which are arranged at the open point (12) and which are connected to one another via a screw device, and in that, for accommodating the bearing arrangement and the permanent magnet (16) of the power rotor (15), the can (4) is of pot-shaped form with a wide flange (9) which is clamped radially between the housings, and in that a seal is arranged between the mutually facing faces of the can (4) and the pump head (3), wherein the seal, formed as a ring, is arranged in a face ring groove (6), and in that, in order to close off the entire pump head (3), the face ring groove (6) is arranged on that side of the pump head (3) which faces the flange (9).
2. Rotary piston machine according to Claim 1, characterized in that the connection between the base housing (1) and the pump head (3) is formed as a quick-connection coupling (10) which engages on corresponding devices (7, 11) of the base housing (1) and the pump head (3).

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