DE2301503A1 - PUMPING SYSTEM - Google Patents

Description

y. Bellmore. New York 11710 V.St.A.

Our sign; F 876

Pumping system

The invention relates to "a pump system that is used to transfer Liquids or fluids, in particular in the graphic field, can be used.

The present invention relates generally to transmission of active solvents and liquids with different viscosities individually or in combination with other substances by means of a pumping device; it relates in particular to the pumping of paint solutions or printing inks, adhesives, varnishes, Paints and cleaning fluids in the graphic field.

Heretofore, in the graphic arts field, color solutions have been transferred (Printing inks), adhesives and other liquids from storage containers in dispensing, transfer or application stations on printing presses and other facilities various

Dr Hn/bgr

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Types of pumping systems used. These pumps are generally rotary, impeller or piston pumps and they consist of rigid materials that are resistant to chemical attack by the materials to be pumped. However, these conventional pumps are subject to high wear (Wear), because the wear surfaces are exposed to the materials being pumped, and their maintenance costs are high. If the materials to be pumped are changed in terms of their color or for other reasons, results There is a delay in the operation of these pumps because either the pump surfaces exposed to the liquid are cleaned and need to be cleaned or the pumps need to be replaced with a different pump. For certain operations, where numerous changes occur, no pumps are used at all and the materials are manually added to the System introduced. In all cases in which pumps are used, adequate cleaning of the Pumping requires considerably large amounts of solvents or detergent compounds, resulting in high ongoing material costs and leads to a high storage room. The cleaning time for the pumps is a significant downtime cost factor for the press or other equipment that depends on the use of the pump and for reducing of the failure factor, a reserve store for pumps is maintained in many systems, so that the Ρμιηρβη exchanged and become one can be cleaned later.

The main object of the present invention is now to solve the above-mentioned and other difficulties and disadvantages of the previous The practice to be avoided and overcome by a pump that uses the principle of squeezing an elastomeric tube the only part of the device that comes into contact with the material to be pumped is the inside of the Pipe, the connecting line and the coupling device are.

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Another object of the present invention is to provide a Specify a method and a device with the help of which it is possible to reduce the flow properties to the required extent set so that they meet the requirements for a wide variety of materials and viscosities. Another goal of the invention consists in specifying a liquid pump in which the elastic part can be quickly exchanged in order to to keep downtime in the production process to a minimum. Another aim of the invention is to provide a new method of pumping to be specified by means of a pumping system with a new coordination and combination of parts.

The above goals and other goals are achieved according to the invention by a number of features, steps and elements, which are lined up in a row and in reciprocal combination Working together that the effects of the invention are achieved.

Tests in this regard have shown that by using the pumping method according to the invention and by using the pumping method according to the invention Pump device in relation to reducing the downtime for cleaning the pump in relation to the required Amount of solution compared to the previously known or practiced Pumping method advantageous results can be achieved that justify that an already existing pumping device is completely replaced by the apparatus according to the invention.

According to an essential embodiment of the invention that must Pipe through which the material is pumped, of an elastomeric nature and yet against the dissolving effect of solvents, such as methyl ethyl ketone, toluene, xylene, ethyl acetate and others Esters as well as different alcohols individually or in different combinations, be resistant. A request from various Chemicals, rubber and plastics manufacturers have shown that that there is currently no material commercially available that meets the requirements for the practical application of the

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inventive method for pumping the above formulations must be fulfilled.

An essential feature of the present invention is therefore the development of an elastomeric material that meets the required conditions fulfilled and which has proven to be commercially practicable. This elastomeric material is made by Polymerization of polyvinyl alcohol with a monomer such as methyl methacrylate. The polymerization takes place by immersion of the polyvinyl alcohol base material into the monomer and then irradiated. Polyvinyl alcohol is hygroscopic and is therefore rapidly degraded when exposed to water or other water-soluble solvents. However, if you have him the above Subject to the treatment method described, the end result is a very "water-resistant material that is also inert if it comes into contact with the solvents described above.

Another essential feature of the present invention is that there is an outer tube or jacket which is also of an elastomeric nature and of the same or a different material, e.g. polyvinyl chloride (PVC). The outer tube protects the inner tube against wear and abrasion caused by the roller, which increases the service life of the inner tube.

The device according to the invention can be used over long periods of time operated continuously before a pipe burst requires replacement and this far exceeds that Requirements that are placed on economic efficiency.

According to a preferred embodiment, there is the inventive Pumping system from a housing which contains practically all of the various integrated structures according to the invention, a suitable

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Enable control of the liquid to be pumped through.

Further objects, features and advantages of the invention will become apparent from the following description taken in conjunction with the accompanying drawings Drawings in which like reference numbers are used to denote like parts throughout. Mean:

1 shows a perspective view of a pump system according to the invention j

Figure 2 is a cross-sectional view taken along line 2-2 of Figure 1;

Figure 3 is a fragmentary cross-sectional view of the pumping action;

4 shows a cross-sectional view through the housing device;

Figure 5 is a cross-sectional view of another embodiment the invention;

Fig. 6 is a cross-sectional view illustrating the use of a concentric pipe system; and

7 is a cross-sectional view illustrating the use of a pipe system with a jacket.

In Fig. 1 of the accompanying drawings, the inventive Apparatus generally designated by the reference numeral 10 and it comprises a support means 12 on which a housing 25 is mounted is, which contains inside the pumping device 30, which is for pumping a liquid (fluid) at a controlled rate suitable and is provided with an adjusting device 75 which protrudes from the housing and the correct setting of the pump device enables. In addition, the housing 25 contains a regulating device 120, with the help of which the flexible pipe

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system by which the liquid (fluid) is pumped through the pump, the pressure exerted can be set correctly, to control the flow rate in a suitable manner, the regulating device also from the housing stands out. A drain device 130 is also connected to the system 10 and has an outlet opening through the housing 25 has so that spilled or overflowed liquid can drain and be collected within the housing. the The mutual relationship between the various elements of the device according to the invention is evident from the following description emerged.

Carrier device ^ The carrier device 12 has the shape of a Stand with 4 vertical supports 14 connected to each other by horizontal rods 16 at the upper inde of the same the rods being connected to the supports 14 by means of connecting pieces 18 at the upper ends thereof. To the lower end 14 are provided in the same way horizontal rods l6, which by means of connecting pieces 20 in the usual way are connected to the supports 14. From the bottom of each support 14 protrudes a pivotable roller 22 with wheels, with the Help it is possible to transport the carrier device 12 to different locations where the pump system within a Plant can be used. On the 'remote side of the rods 16, a platform 24 is arranged in a conventional manner can be attached to the rods 16.

Housing ^ The housing 25 surrounds practically the entire pumping device 30 and comprises, as can be seen in particular from FIGS is, a bottom wall (bottom wall) 26, an opposing top wall 28, opposing side walls 32 and and a rear wall 35 which are connected to one another in a conventional manner. The lower wall 26 of the housing can be in a conventional manner

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(not shown) are attached to the carrier device 12 in such a way that that it is rigidly connected to it. The housing 25 further includes an access for the pumping device 30 within the housing 25 by a front panel 36, which is provided with a removable entrance flap 38 with a handle or button 40 which extends outward in the usual manner. the Entrance flap 38 may be hinged or detachable to front panel 36 in any other manner be attached and it can consist of a transparent plastic or glass. This makes it possible to remove the internal parts of the Housing to be observed visually. In the housing 25 are various Openings and cutouts are provided to provide the necessary access so that the elements of the system can be interconnected can function as described in more detail below.

Pump_einrichtung2, The pump device 30 comprises a peristaltic Pump, which has the task of pumping through the various liquids or fluids according to the invention and which the Control of the various forces that are used to control the pumping forces when the pipe material is to be replaced as well as in relation to the consistency of the liquids pumped through. The pumping device 30 has a rotating assembly 31 comprising a pair of disks 42, which are arranged at a distance from one another, as can be seen in particular from FIG. 4, and those in an axial direction Alignment with one another have central bearings 44 and are carried within the housing by a shaft 45 attached to their one end has an upset portion 46 and extends through rear wall 35 and through respective bearings 44 and terminates at the opposite end of the housing in a support channel 48 in a thread or some other device. The disks 42 are driven by rollers 50 which are located between the inner surfaces of the pair of axially aligned disks extend, with an enlarged head portion 54 to maintain

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the fixed position of the disks 42 at a distance from one another held. The channel 48 has a base 49 that the upper wall 28 abuts with the arms 51 extending downward. The arms 51 are by means of fasteners attached to the housing walls. The discs 42 are mounted so that they act as a rotational arrangement and about the shaft 45 angularly can be rotated.

TJm a rotation of the rotating structure 31 in the direction of To obtain arrow 55, a rotation device 60 is provided and connected to the rotating structure 31. The rotating device 60 comprises a conventional electric motor 62, the adjacent is arranged to the platform 24 and attached to the rear wall of the housing by means of fastening devices, extending through the projections or stud portions 66 protruding from the motor housing, the fasteners 64 extend through this, as can be seen in particular from FIG. 4, that the threaded Section extends through the mounting holes 68 so that a sealing ring 70 is attached to the inner surface of the Wall 35 abuts and is held in place by means of the lock nut 72. Through a clearance opening 68 provided in the wall 35 fine adjustment of the physical relationship between the motor and the rotating device 60 by means of the adjusting device 75 can be achieved. The adjusting device 75 is used for fine control and adjustment of the motor 62 so that the shaft 72 can be set correctly for the reasons explained below.

^The adjustment device 75 shown in FIG. 4 comprises a bracket 76 which is fastened to the rear wall 35 by fasteners 78 and has a substantially horizontal arm 80 protruding therefrom for receiving an adjustment screw 82 with a threaded portion 84,

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which extends through a mating threaded portion 84 which passes through a mating threaded portion 86 in the arm 80 extends into the motor housing 62 in such a way that clockwise rotation of the screw 82 will adjust the Motor shaft 72 supported by opening 88. The shaft 72 extends through the rear wall 35 and a rotation of the Screw 82, in turn, causes the tension (tension) in the drive connection between the motor 62 and the pulley 42 changes.

A wide variety of drive devices can be used to couple the rotating motor shaft 72 to drive the rotating structure 31 be used. As can be seen from the Pig, 2 and 4, the drive means comprises a belt belt 90 which extends within a groove 92 extends on the roller 94, and a complementary one Groove 96 is on the outer periphery of the disk 42. The adjuster 75 allows the proper tensioning of the Tape 90 so that it can be easily inserted between the groove 92 and 96 and adjusted depending on the abrasion results, that occur with continuous use of the tape.

2 The regulator 120 is provided to regulate the pressure (tension) in the tube 98 when the rollers (Rollers) 50 are continuously in contact therewith to achieve the peristaltic pumping action, as explained in FIG. 3. Each roller 50 is supported by metal bearings 126, which one allow free rotation of the rollers 50 about the respective axis, which by the shaft 52 corresponding to the rotation of the shaft 45 is formed by the drive device explained above. If now the roller 50 is in the left section of the cavity is located, it presses on the tube 98 and flattens the tube 98, as shown in cross section in FIG. This will make the Liquid (fluid) pushed forward in the compressed area. When the tube 98 returns to its normal shape when

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once the roller 50 has passed over it, it becomes in the tube creates a vacuum that pulls the liquid through in the desired direction, by repeating this process the liquid (fluid) is continuously pumped from the inlet line 102 into the outlet line 124. To regulate the pressure A regulating device 120 is provided in the line 92, which regulates a regulating button 128 and protruding from the housing 25 a regulating shaft 130 which extends into the housing 25 and has a threaded portion 132 which is in a complementary threaded section 13 * 1 fits in the housing wall 138, so that a vertical movement of the shaft 130 is generated by an angular rotation of the control knob 128, which in turn is coupled to the fluid block (fluid block) 136; A peristaltic mode of operation of the pump is obtained by that a liquid is passed through a conduit 98 which is deformable and elastic, i.e. that after deformation returns to its original shape. As is common with peristaltic pumps, when one or more compression travel sections along the length of tube 98 are provided, under the action of the compressed portions which push the liquid forward, and under the action of the tube, which returns to its original, uncompressed shape, a vacuum that causes that the liquid in the tube flows in the direction of movement of the compression sections. The tube 98 is at its inlet end 99 connected by means of a bracket 103 to a quickly detachable coupling device 100, which is can act any of the known coupling devices and which in turn is in communication with the inlet line 102, which extends through the rear wall of the housing 25 and into which the liquid (fluid) in the direction of arrow 104 entry. The tube 98 then protrudes over the rotating structure 31 in such a way that it comes into contact with the roller 50, and when compressed the wall practically forms one

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upper section 106 and a lower section 108, the liquid 110 being contained in these different sections, as in particular from the-Fig. 3 can be seen, so that the entering in the direction of arrow 112 during the pumping process Liquid a peristaltic mode of operation is achieved when the pumping device is operated in the direction of arrow 55.

The outlet section 114 of the tube 98 is correspondingly means a mounting device 103 is connected to a quickly detachable device 115, which extends through the regulating device 120 and through a conduit 116 extending through an opening 118 in the side wall 32 and through a knee connector which in turn is connected to a line 124 so that the liquid can exit in the direction of arrow 112. The arrangement of the outlet line 124 and the arrangement of the Quickly removable couplings can of course vary depending on their location inside or outside the housing or a any other arrangement that is appropriate for the use.

^{To enable the} regulating device 120 to move vertically, a guide device is provided and an embodiment of the same is illustrated in the figure; as can be seen therefrom, it comprises a pair of spaced-apart columns 142 attached to the upper

themselves
Wall 128 are attached and / from this to the lower wall and may take the form of fasteners with screws 144 at each end to maintain the required tension. The columns 142 extend through the liquid block 136 in such a way that the liquid block is freely displaceable on the two columns 142 when the required adjustment of the regulating device is made by turning the knob 128.

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Drainage device :. In connection with the housing 25, a drainage device 150 is provided which enables an overflowing or otherwise escaping liquid 110 to easily escape from the housing 25. The drainage device 150 is illustrated in Figures 2 and 4 and is in the form of a conduit 152 attached to the lower wall 26 and having a head portion which is positioned within the housing so that when the Escaping liquid (fluid) reaches the height of the 'head 15 ¹ J, it automatically drains through the line in the direction of arrow 55.

In Fig. 5 of the accompanying drawings, another embodiment of the invention 10a is shown in which the rotating device 68a is arranged with respect to the pump device 38a so that the shaft 72a of the motor 62a is in longitudinal axial alignment extends or part of the shaft 42a • forms, so that there is a direct drive and not a belt. tape or any other facility is required. The disks 42a are on the shaft i'5a on the one described above Manner with the rollers 50a coming into contact with the conduit 98a and compressing it to form a upper portion 106a and a lower portion 108a. The shaft 45a can form a unit with the motor shaft 72a or be mechanically coupled to this and it is carried by ball bearings 160a which are arranged in the support channel 48a are.

Another aspect is shown in Figure 6 of the accompanying drawings of the invention explained, wherein the conduit pipe 98b consists of two concentric pipe parts which are arranged one inside the other. As can be seen therefrom, it consists of the inner conduit pipe 98b and the outer conduit pipe l62b. It has been found that the use of concentric tubes made of plastic or a other material offers certain advantages both in relation to that

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Pumping method as well as in terms of added security in that when the inner tube 98b is made of any The base breaks or tears, the outer tube 162b acts as a protective cover and at the same time ensures the further puncture of the unit, since the respective tubes are clamped at their free ends and held in their position. If now the inner Pipe 98b has a defect due to its manufacture and cracks at one point, then it is unlikely that it will outer tube l62b has a weakened wall at the same point. If a break now occurs, it also lasts outer tube l62b returns the liquid. This makes it possible that by an inspection of the unit from time to time or at a noticeable decrease in the pumping power, the device can be switched off in good time to avoid leakage.

In Fig. 7 of the accompanying drawings is another Aspect of the present invention explained, this time the tube 98c having an outer coating or layer 164c and a inner coating or layer 167c, which have been produced by polymerization. The outer coating l64c penetrates into the wall of tube 98c to one indicated by dashed line l65c during the procedure discussed below Penetration depth and, in a corresponding manner, the inner coating on the inside of the wall penetrates into one the depth indicated by dashed line 168c.

An example of the polymerization process is the filling of the tubes 98c in a container that is evacuated and with a Inert gas, such as nitrogen, and then with the monomer material, such as methyl methacrylate, which is in liquid form, is filled, thereby surrounding the inner and outer surfaces of the tube 98c. During a soaking time (Humidification time) of, for example, 24 hours that penetrates Monomers effectively into the polyvinyl alcohol tube. The entire

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"- 14 -

container is then a radiation source, for example cobalt 60, exposed for such a period of time that the desired polymerization is achieved. The length of time can vary up to 24 hours and it appears to depend on a number of variables away. The amount of time required for wetting can be decreased by introducing ultrasonic energy into the monomer liquid will. The vibration frequency can be in the range of 20 to 100 kHz. The time can also be dependent can be varied by the monomer. This process can be done on a polien material or some other shape using the same end result can be applied. The inside tube diameter is about 1.27 to about 12.7 cm (0.5 to 5 inches) and the wall thickness is about 0.051 to about 1.27 cm (0.02 to 0.5 inches). The pipe obtained in this way has proven to be very good well suited for the use for the transport of liquids (fluids), such as the color solutions mentioned above and Printing inks, proven in the device according to the invention.

The liquid conduit pipe which can be used according to the invention can be made in different ways and another example for its manufacture consists in coating the tube with a polymerizing material such as triallyl isocyanurate can be achieved, for example, by immersing tube 98c in a container and then inside the container creates a vacuum of about 3 mm of mercury and then fills the vacuum container with nitrogen. The polymerizing material is then for a certain period of time, for example 4 hours, added to the container. The pipe 98c is connected to a radiation source, for example cobalt 60, irradiated. In this way, a core made of a plastic material can become a technically usable one Moldings are processed. The core can be in the form of a tube or a sheet (plate).

The invention has been described above with reference to

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attached drawings based on preferred embodiments The invention is explained in more detail, but it is clear that it is not limited thereto and that it is modified in many ways and can be modified without departing from the scope of the present invention.

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Claims (43)

Claims Pump system, characterized by (A) a housing (25) having an inlet port and an outlet port extending therethrough, (B) a pump device (30) secured within the housing (25) and connected to the inlet and outlet openings in. Is in communication, wherein a liquid enters through the inlet opening, is pumped by the pumping device (30) and exits through the outlet opening, the pumping means (30) includes (1) a structure of rotation ('3I) * which is inside the housing rotatable ^: (25l / is attached and comprises a multitude of rotating parts arranged at a distance from one another, which are rotatably mounted on it so that they can rotate independently of each other, (2) a liquid conduit pipe (98) referring to the rollers is arranged so that it comes into contact with them one by one, and (3) Rotary devices that are coupled to the rotary structure (3D, (C) a coupling device (IOC) at each end of the fluid line pipe (98) for connecting to the inlet and outlet ports and (D) a regulator (120) in communication with the liquid conduit pipe (98) at substantially one end thereof stands, with the help of which a relative movement to the rotating part can be generated, whereby the pressure in the Line pipe (98) can be regulated. 309829/0496 2. Pump system according to claim 1, characterized in that it also comprises a drainage device which is connected to the housing (25) is in connection, through which liquid can flow out of the housing. 3. Pump system according to claim 2, characterized in that the drainage device is provided on the bottom of the housing. 4. Pump system according to claim 1, characterized in that the regulating device also has an associated guide device with the help of which their direction of movement can be controlled during adjustment. 5. Pump system according to claim 4, characterized in that the guide device is a pair of spaced apart Includes pillars attached to the housing and extending through the regulator so that the latter is freely movable on it. 6. Pump system according to claim 1, characterized in that the regulating device comprises (a) a fluid block (fluid block) communicating with one end of the fluid conduit pipe, (b) a shaft protruding from the liquid block and rotatably mounted with respect to one end thereof, and the opposite end of which is rotatable relative to the housing, the rotation of the shaft relative to the Housing causes a linear movement of the liquid block and a control of the pressure in the conduit pipe, 7. Pump system according to claim 6, characterized in that (a) the shaft extends outwardly through the housing and has a threaded portion, and that the housing 309829 / 0A96 has a complementary threaded section for receiving the shaft and (b) that it also has a control knob _T attached to the shaft at its free end. 8. Pump system according to claim 1, characterized in that the liquid line pipe consists of an inner and a concentric one outer tube is made. 9. Pump system according to claim 1, characterized in that it also has a support device connected to the housing having. 10. Pump system according to claim 9 *, characterized in that the Carrier device has pivotable rollers to make the pumping system movable. 11. Pump system according to claim 1, characterized in that the liquid line pipe consists au.ii Ca) a plastic core and (b) an inner coating produced thereon, the opposite is resistant to the liquid being pumped through. 12. Pump system according to claim 11, characterized in that the core consists of polyvinyl alcohol. 13 · Pump system according to claim 11, characterized in that the inner coating consists of a polymerizing material. 14. Pump system according to claim 13, characterized in that it see the polymerizing material to triallyl isocyanurate acts. 09829/0496 15. Pump system according to claim 1, characterized in that the The housing also has an access opening for facilitating visual inspection of the interior of the housing. 16. Pump system, characterized by (A) a housing (25) with one extending through the housing Inlet port and an outlet port, (B) a pumping device (30) which is arranged within the housing (25) and having the inlet and outlet openings is in communication, with a liquid entering through the inlet opening, pumped by the pumping device (30) and exits through the outlet port, the pumping means (30) comprising: (1) a rotational structure (31) »which is rotatable within the Housing (25) attached isv and a plurality of spaced rotating parts on- ' has, which are rotatably mounted on it so that they can rotate independently of each other, (2) a liquid conduit tube (98) which, with respect to the Rolls is arranged so that it successively comes into contact with it, and (3) a rotating device which is coupled to the rotating structure (31) and comprises an electric motor, (C) a coupling device (100) at each end of the liquid line pipe (98), which connects the inlet and outlet ports with it, (D) a regulator (120) at one end thereof is connected to the liquid line pipe (98), with the help of which it is possible to relate this to the rotating parts to move whereby the pressure in the conduit (98) can be regulated, the regulating means (100) comprising: 309829/0496 "- 20 - (1) A fluid block (136) tied to one end of the Liquid line pipe (98) is in communication, and (2) a shaft (130) protruding from the liquid block (136) and rotatable with respect to one end thereof is attached and is rotatable at the opposite end relative to the housing (25), whereby through the Rotation of the shaft (130) relative to the housing (25) a linear movement of the liquid block (136) and a control of the pressure in the conduit (98) is effected, (E) a guide device (l40) associated with the regulating device (120) is in connection, for controlling the direction of movement of the same during the adjustment, the at least a column (142) attached to the housing (25) and extending through the regulator (120), so that the latter can be moved freely on it, (F) an adjusting device (75) for adjusting the position of the electric motor (62) relative to the rotating structure (31) and (G) a carrier device (12) which is connected to the housing (25). 17 · Pump system according to claim 16, characterized in that it also has its drainage device which is on the floor of the housing is provided and allows the drainage of liquid. 18. Pump system after. Claim 16, characterized in that a) the shaft protrudes from the housing and has a threaded part and that the housing has a complementary thread for receiving this shaft and that 309829/0496 ι * "b) a control button is mounted on the free end of the wire is. 19. Pump system after. Claim 16, characterized in that the rotation structure contains: a) a shaft mounted relative to the housing, b) a pair of spaced discs, which are rotatably mounted on the shaft, c) a plurality of rotating parts mounted at a distance from one another on the disks and d) a belt connecting the electric motor to one of the pulleys. 20. Pump system according to claim 16, characterized in that the liquid conduit tube consists of an inner tube and a concentric outer tube. 21. Pump system according to claim 16, characterized in that the carrier device has swiveling rollers to make the pumping system movable * 22. Pump system according to claim 16, characterized in that the liquid line pipe consists of a) a plastic core and b) an inner upper pull produced on it, the opposite one is resistant to the liquid being pumped through. 23. Pump system according to claim 22, characterized in that the core consists of polyvinyl alcohol. 24. Pump system according to claim 22, characterized in that the inner coating consists of a polymerizing material. 25. Pump system according to claim 24 »characterized in that the polymerizing material is triallyl isocyanurate acts. 309829/0496 26. Pump system according to claim 16, characterized in that the housing also has an access opening to facilitate visual inspection of the interior of the housing. 27. Pump system according to claim 16 _9, characterized in that the rotational structure comprises a) a shaft rotatably attached to the housing, b) a pair of spaced-apart disks rotatably mounted on the shaft, c) a plurality of rotating parts mounted at a distance from one another on the disks and d) a device for direct coupling of the electric motor on the shaft in axial alignment with it. 28. Pump system according to claim 16, characterized in that a) the housing has a lower wall, an upper wall, side walls, comprises a rear wall and a front panel, which are arranged at a distance from each other, b) that a flap is attached to the front panel to have access to the pumping device, and c) that the electric motor is mounted on the rear wall so that its shaft extends through the same. 29. A method for producing a molded body with a plastic core, characterized in that one A) put the plastic core in a container, B) creates a vacuum in the container, C) fills the container with an inert gas, D) the plastic core, immersed in a monomeric material, so that this virtually completely surrounds the inner and outer surfaces of the core and has a coating thereon forms, 309829/0496 (E) leaving the core in the monomer for a period of time and (P) irradiated the core for a certain time / long to complete the polymerization to effect the upper layer on the core with the formation of the desired shaped body. 30. The method according to claim 29 _S, characterized in that nitrogen is used as the inert gas. 31. The method according to claim 2 9> characterized in that the The vacuum in the container corresponds to about 3 mm of mercury. 32. The method according to claim 29, characterized in that methyl methacrylate is used as the monomeric material 33. The method according to claim 32, characterized in that the Methyl methacrylate is in liquid form. 34. The method according to claim 29 »characterized in that the The core consists of polyvinyl alcohol. 35. The method according to claim 29 »characterized in that the core is immersed in the polymer for about 4 hours, when the vacuum is kept at about 3 mm of mercury. 36. The method according to claim 29 » characterized in that the immersion time is about 4 to about 2k hours. 37. The method according to claim 29 _S, characterized in that cobalt 60 is used as the radiation source. 38. The method according to claim 29, characterized in that also 309 8 297 049 vibrating energy on the polymerizing material at a frequency within the range of about 20 to about 100 kHz. 39. The method according to claim 29, characterized in that the core used has the shape of a tube. 4®. Method according to claim 29, characterized in that the tube has an inside diameter within the range of 1.27 to 12.7 cm (0.5 to 5 inches). 41. The method according to claim 40 »characterized in that the wall thickness of the tube is within the range of 0.51 to 1.27 cm (0.2 to 0.5 inches). ^ i2. Method according to Claim 2, characterized in that the core used is in the form of a film or plate. 43. The method according to claim 20, characterized in that the coating is formed on both sides of the core. 309829/0496