WO1994029033A1

WO1994029033A1 - Hydraulic pumping device

Info

Publication number: WO1994029033A1
Application number: PCT/DE1994/000661
Authority: WO
Inventors: Hans F. Grimm
Original assignee: Idh Maschinen Und Anlagen Handelsgesellschaft Mbh
Priority date: 1993-06-15
Filing date: 1994-06-15
Publication date: 1994-12-22
Also published as: DE4319803A1; AU6967894A

Abstract

A hydraulic pumping arrangement, in particular for liquids mixed with abrasive and/or aggressive solids, supplies a medium to a consumer. A compression unit (3) which only indirectly delivers the liquid allows wearless operation and a long service life.

Description

Hydraulic pump device

The invention relates to a hydraulic pump device, in particular for liquids mixed with abrasive and / or aggressive solids, which supplies a consumer with a medium.

To coat surfaces that claim to have a color build-up (e.g. thin paint coating), such as in the automotive industry, shipbuilding, bridges or acoustic panels of soundproofing ceiling systems, paints or varnishes with a high solids content are sprayed on. The abrasive and / or aggressive fillers contained in these liquids very quickly cause wear on the seals and packings on the known piston pumps used for their delivery. It has been found that the solids-laden liquids in three-shift operation often cause complete wear of the pump components mentioned after only a few days. Apart from this, the use of a compressor is indispensable in the known pneumatically operated piston pumps, i.e. the necessary compressed air is a very expensive energy; In addition, there is usually a high level of noise and the problems that arise due to inevitable icing.

The invention is therefore based on the object of providing a pump device of the type mentioned at the outset which can be operated without the disadvantages mentioned and which ensures long service lives.

According to the invention, this object is achieved by a pressure unit which only indirectly promotes the liquid - or another carrier medium which is loaded with solids. The invention is therefore based on the basic idea that the solid, abrasive and / or aggressive liquid does not even come into contact with the piston, the cylinder tube seals and packings etc. and thus enables a largely wear-free pump device. The liquid flow and a hydraulic circuit acting on the pressure unit are therefore advantageously separated from one another. The hydraulic circuit is used solely to drive the pump, the pressure unit preferably having at least one displacement housing which is connected to a filling station. When the printing unit is in operation, the pressure medium displaced from the filled displacement housing can then be used to convey a separately stored subset of the solids-laden liquid to the consumer.

A preferred embodiment of the invention therefore provides that the displacement housing is connected to a pump chamber of a media separator, which is separated from a pressure chamber by an elastic, walkable partition wall arranged sealingly within the media separator housing. If the pressure chamber is connected on the one hand to a liquid supply line and on the other hand to a consumer line via a suction and pressure line having a suction and an outlet valve, the pressure unit can be operated reversibly in the sense of a hydraulic Bowden cable and the solids-laden liquid can be pumped into the pressure chamber or suction from this, depending on the direction of action of the pressure unit, which preferably consists of two counter-acting plungers, which are reversibly immersed with their piston rods in one and the other of the filled-in displacement housings.

The displacement housings enclose between them a sealed path cylinder, which is separated by a working piston connected to the piston rods into a first and a second working space. By means of the reversible pressure unit, the liquid mixed with abrasive and / or aggressive solids can be pumped into the pressure chamber of the media separator or sucked out of it, and in the case of duplicate pump and pressure chambers as well as associated outlet and suction valves, the pumped a liquid pressure chamber and simultaneously sucked liquid from the other pressure chamber, the On the outlet side, outlet valves open into a common pressure or consumer line. A membrane pressure accumulator, which is known per se, can advantageously be used as the component known as the media separator, which provides the pump and the pressure chamber, in order to cover a peak demand that sometimes occurs briefly in hydraulic systems with different levels of oil consumption.

It is proposed that the working piston be formed in one piece with the two piston rods, so that in this case the piston rods act as plunger ends.

For reversible operation of the working piston, each working area is connected to the hydraulic circuit via a line connection. By reversing, one or the other piston ring surface is acted upon with hydraulic fluid. The control is carried out, for example, by proportional valves with a ramp, black-and-white valves with reversible actuation that can be influenced or with a high-pressure pump that can be regulated in the flow and reversible in the conveying direction. All ways, i.e. fully damped left and right of the working piston, i.e. be extended in the impact-free reversing mode, which makes it possible to achieve the desired displacement, preferably 0.5 l per stroke, in which the hydraulic fluid of the pressure unit separates the media separator which receives the solids-laden fluid.

For reversal, initiators can be arranged in the direction cylinder, which interact with an encoder of the working piston, which enables very precise stroke distances within the scope of an NC control of the printing unit. The working piston can consequently alternately be pressurized or relieved of pressure by the hydraulic fluid under pressure by means of an external reversing device.

If a hydraulic accumulator is arranged in the consumer line, it can serve as a pulsation damper.

The hydraulic one to be executed as a mobile station Pump device can be supplemented in the manner of a modular system by several interconnected pressure units. This makes it possible to vary the performance of the hydraulic pump device accordingly. The pump device is operated at constant pressure - this can be in the range from 15 to 130 bar - and can operate with a pressure ratio of, for example, 1: 1; in principle, all technically feasible high pressures can be realized. Depending on the desired translation, the effective cross section of the annular working spaces of the cylinder can be the same, larger or smaller than that of the plunger or plungers.

It is proposed that spray devices are connected to the consumer line. This can be, for example, a plurality of spray guns connected to a distributor of the consumer line or it can be a nozzle bar, the hydraulic pump device advantageously being able to be used to apply paint to an object. If, for example, acoustic or soundproofing panels of commercial dimensions are to be provided with a color coat, an oscillating nozzle bar with 3 to 12 nozzles, with which 1.5 1 color per minute and nozzle can be applied, results in an optimal coverage.

Further features and advantages of the invention result from the claims and the following description, in which an exemplary embodiment of the subject matter of the invention illustrated in the drawings is explained in more detail. Show it:

Figure 1 is a schematic representation of the overall view of a hydraulic pump device according to the invention;

FIG. 2 shows, as a detail of the pump device according to FIG. 1, the pressure unit having a working piston with two piston rods in a directional cylinder, shown in cross section; and

Figure 3 is a schematic overall view of the use of the pump device according to the invention using the example of equipment to be sprayed acoustic panels.

A pump device 1 consists of a hydraulic unit 2, a pressure unit 3 and two media separators 4, 5, which are connected to a consumer line 6. The printing unit 3 is designed as a travel cylinder 7, which has a displacement housing 8, 9 on each side. Arranged in the direction cylinder 7 is a plunger 10, which consists of a working piston 13 formed in one piece with two piston rods 11, 12, which plunges the interior of the direction cylinder 10 into a first or second pressure chamber 14a or respectively located in front of the piston surfaces of the working piston 13. 14b (see FIG. 2) divided. The displacement housings 8 and 9, which enclose the directional cylinder 13 and are divided by partition walls 15, accommodate the piston rods 11, 12 arranged with seals 16 in the partition walls 15.

For the reciprocating movement of the plunger 10 in the direction of the double arrow 17 (cf. FIG. 1), hydraulic lines 18, 19 coming from the hydraulic unit 2 are connected to the pressure chambers 14a, 14b located in front of and behind the working pistons 13. In order to reverse the piston movement in the end positions, initiators 20, 21, shown schematically in FIG. 2, are arranged in the direction cylinder 7, which cooperate with a sensor 22 provided on the working piston 13 and support the full extension of the stroke paths. The displacement housings 8, 9 of the plunger 10 are connected via lines 23, 24 on the one hand to a pump chamber 25 of the media separators 4, 5 and on the other hand via interposed shut-off valves 26, 27 to a common line 29 leading to an oil reservoir or a filling station 28. The pump chamber 25 of the media separators 4, 5 is separated from a pressure chamber 31 by an elastic, walkable partition wall 30 (cf. FIG. 1) which is arranged sealingly within the media separator housing. The pressure chambers 31 are connected on the one hand to a liquid supply line 36 and on the other hand to the consumer line 6 via a first and a second suction and pressure line 34 and 35, each having a suction valve 32 and an outlet valve 33, since the Outlet valves 33 open together on the outlet side.

To operate the hydraulic pump device 1, the displacer housings 8, 9 are filled with hydraulic fluid fed from the filling station 28. In order to move from the central position of the plunger 10 shown in FIG. 2 to the left stroke end position shown in FIG. 1, hydraulic fluid is fed into the working space 14b from the hydraulic unit 2 via the hydraulic line 19; The working piston 13 then moves to the left, the hydraulic fluid flowing from the working space 14a located in front of the piston 13 in the closed circuit via the hydraulic line 18 back into the hydraulic unit 2. At the same time, the piston rod 11, which dips into the displacer housing 9, displaces a quantity of hydraulic fluid corresponding to its displacement volume via the line 23 into the pump chamber 25 of the media separator 4 on the left in FIG. 4 Line 36 and the suction valve 32 and line 35 previously sucked into the pressure chamber 31 of the media separator 4 amount of liquid through the previously serving as a suction and now as a pressure line 35 and the outlet valve 33 into the consumer line 6. Simultaneously with this working stroke is in the Pressure chamber 31 of the other, in Fig. 1 right media separator 5 via the suction (and pressure) line 34 and the activated suction valve 32, a new, solids-laden liquid supply is sucked out of the supply line 36, the hydraulic fluid from the pump chamber 25 of the medium ntrenners 5 is conveyed back via line 24 into the displacement housing 8.

As a result of the reversal of the direction of movement triggered by the initiators 20, 21 of the directional cylinder 7 or the transmitter 22 of the working piston 13, the above-described process takes place in reverse. During the reversing operation of the working piston 13, on the one hand the hydraulic fluid oscillates between the working spaces 14a and 14b and the hydraulic unit 2 and on the other hand the one filled into the displacement housing 8, 9 - 1 -

Hydraulic fluid between the pumping spaces 25 of the media separators 4, 5 and the displacement housings 8, 9 back and forth. As a result of these work cycles - bypassing the printing unit

3 -. the solid-loaded, abrasive and / or aggressive liquid accordingly in the pressure chamber 31 of the media separator

4 or 5 sucked in or pushed out of this and fed into the consumer line 6. In this way, it is possible to convey the abrasive and / or aggressive liquid without it coming into contact with the pistons, seals and packings of the pressure unit 3, which ensures that the hydraulic pump device 1 operates almost without wear. So that any leaks from the displacement cylinder 7 and the two displacement housings 8, 9 can be discharged separately, the displacement cylinder 7 is provided with leakage oil connections 53 (cf. FIG. 2).

In Figure 3, as an example of the use of the hydraulic pump device, the application of a layer of paint to acoustic panels 37 used for sound insulation is shown, i.e. in this case the liquid to be pumped is color mixed with abrasive solids.

A paint feed designed in the manner of a pigging system

38 ensures a sufficient supply in a paint container 39 equipped with an agitator and a level control. The color is removed from the container by means of a diaphragm pump 40

39 fed to a storage tank 41, into which, in addition, an overhang that accumulates when the acoustic panels 37 are sprayed and collected in a collecting trough 42 is fed in in the return with the aid of a diaphragm pump 43; Both the return liquid and the paint supplied from the paint container 39 pass through a vibrating screen 44 before entering the storage tank 41, in which the paint is filtered.

With the help of the hydraulic pump device 1 described above, which comprises the media high-pressure pump consisting essentially of the printing unit 3 and the media separators 4, 5, the required amount of paint is then drawn off from the storage tank 41 via the feed line 36 and the Consumers 45 promoted continuously. This consists of a nozzle bar 47 having a plurality of spray nozzles 46, which is arranged in an oscillating manner at the end of the consumer line 6 and enables the paint to be sprayed onto the acoustic panels 37 transported by a cable conveyor system 48 with very precise color metering. The pump device 1 is operated taking into account the dynamic pressure building up in the consumer line 6 above the measuring point 49 there; a hydraulic accumulator 50 arranged in the consumer line 6 serves as a pulsation damper. To clean the system, the system is provided at various positions with rinsing water connections 51 and drain lines 52 to a sewage treatment plant.

Claims

1. Hydraulic pump device, in particular for liquids mixed with abrasive and / or aggressive solids, which supplies a consumer with a medium, and a pressure unit which only indirectly conveys the liquid

(3).

2. Pump device according to claim 1, so that the liquid flow and a hydraulic circuit (18, 19) acting on the pressure unit (3) are separated from one another.

3. Pump device according to claim 1 or 2, so that the pressure unit (3) has at least one compression housing (8 or 9) which is connected to a filling station (28).

4. Pump device according to claim 3, characterized in that the displacement housing (8 or 9) with a pump chamber (25) of a media separator (4 or 5) is connected, which is arranged within the media separator housing sealingly arranged, elastic, walkable partition ( 30) separates from a pressure chamber (31).

5. Pump device according to claim 4, characterized in that the pressure chamber (31) via a suction and an outlet valve (32; 33) having suction and pressure line (34; 35) on the one hand with a liquid supply line (36) and on the other hand one Consumer line (6) is connected.

6. Pump device according to one or more of the claims 1 to 5, characterized in that the printing unit (3) consists of two against each other acting ^• plunger (10), with their piston rods (11, 12) immerse reversible in the one and the other of the filled displacement housing (8 or 9), which between them include a sealed path cylinder (7), which is subdivided into a first and a second working space (14a, 14b) by a working piston (13) connected by the working pistons (11, 12).

7. Pump device according to claim 6, d a d u r c h g e k e n n z e i c h n e t that the working piston (13) is integrally formed with the two piston rods (11, 12).

8. Pump device according to claim 6 or 7, so that each work space (14a, 14b) is connected to the hydraulic circuit via a line connection (18, 19).

9. Pump device according to one or more of claims 6 to 8, d a d u r c h g e k e n n z e i c h n e t. that initiators (20, 21) arranged in the directional cylinder (7) interact with an encoder (22) of the working piston (13).

10. Pump device according to one or more of claims 1 to 9, d a d u r c h g e k e n n z e i c h n e t that a hydraulic accumulator (50) is arranged in the consumer line (6).

Pump device according to one or more of claims 1 to 10, characterized in that the effective cross section of the annular working spaces (14a, 14b) is equal to or smaller than that of the plunger (10).

12. Pump device according to one or more of claims 1 to 11, d a d u r c h g e k e n n z e i c h n e t that pressure units (3) are composed in the manner of a modular system.

13. Pump device according to one or more of claims 1 to 12, d a d u r c h g e k e n n z e i c h n e t that spray devices (46, 47) are connected to the consumer line (6).

14. Pump device according to one or more of claims 1 to 13, d a d u r c h g e k e n n z e i c h n e t. that the direction cylinder (7) is provided with leakage oil connections (53).

15. Pump device according to one or more of the _. Claims 1 to 14, characterized in that it is used for applying paint to an object (37).