AT524763A1 - Device and method for the controlled supply of high-pressure fluid - Google Patents

Abstract

The invention relates to a device for the regulated provision of high-pressure fluid. In order to minimize the disadvantages of the prior art in terms of a complicated design, noticeable wear, complex controllability at low speed and to achieve economical operation, the invention provides that the pressure generator (D) each have an electric linear motor (L) with a stator (9) and forcer (10) for driving the high-pressure plunger (17) in the high-pressure cylinder (15) and the electric linear motor(s) (L, L') is (are) connected to an electric control unit (12).

Description

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Device and method for the controlled supply of high-pressure fluid

The invention relates to a device for the regulated provision of high-pressure fluid by means of a pressure generator formed with a fluid supply and a fluid supply in the high-pressure cylinder and in this movable high-pressure plunger with a drive of the same and a supply of high-pressure fluid in a high-pressure line, optionally with a pulsation damper in this, with a pressure sensor for a control of the drive and possibly a

switchable pressure relief valve.

The invention also relates to a method for providing high-pressure fluid for consumers, for example water jet cutting systems with controllable parameters when using pressure generators with high-pressure cylinders and high-pressure plungers according to the above device.

Devices for the production of high-pressure fluid of different types are becoming increasingly important in process engineering, with these devices having to meet demands for maximum precision while at the same time increasing the speed of the controls.

Especially at high fluid pressures, pressure fluctuations that can result from pressure intensifiers must be minimized for process engineering reasons, but also for material reasons, of plant components because these pressure fluctuations cause alternating mechanical stress on parts of the device and lead to material fatigue or fatigue fractures

be able.

In a hydraulic drive for providing high-pressure fluid, it was proposed according to EP 2 610 490 B1 to increase the quantity and/or the pressure thereof using a pressure intensifier having two plungers and a switching block with a pump driven by a controllable servo motor

regulate.

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In order to keep a pressure drop in the high-pressure fluid low during the switching of a pressure intensifier for systems for water jet cutting with two plungers, it was suggested according to EP 3 012 453 A2 that the servo drive for a hydraulic pump should be bidirectional, i.e. with a reversible motor and

such a direct application of a hydraulic pressure intensifier takes place.

EP 3 012 075 B1 discloses a method for operating a system for water jet cutting with a high-pressure pump that has several plungers and is connected to a water tank, with the plungers of the high-pressure pump being moved via a crankshaft, stopped by a drive using a servomotor and then again be put into operation. Bearing play on the crankshaft and also on the plunger piston joints and the inertial forces during acceleration and deceleration in the course of controlling the drive can have a disadvantageous effect.

The known devices that can be assigned to the prior art can have disadvantages in terms of a complicated design, noticeable wear, complicated controllability with the speed possibly being too low, and improved economics.

It is now the object of the invention to create a new device for the regulated provision of high-pressure fluid of the type mentioned at the outset, with which the disadvantages of the prior art are overcome.

The object is achieved according to the invention in that the pressure generator or several cooperating pressure generators each have an electric linear motor with a stator and forcer for driving the high-pressure plunger in the high-pressure cylinder and the electric linear motor(s) with an electric control unit, which has an electric power supply, a servo converter for electric linear motors, a programmable computing unit and

Measured value feeds includes connected (are).

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The advantages achieved with the invention consist in particular in a simple design, economical operation, comprehensive controllability and a high control speed of the device.

The possibly cooperating pressure generators each have an electric linear motor with stator and forcer, whereby the designations “stator and forcer” do not describe an embodiment of a force introduction, but describe a definition of the motor parts that can be moved relative to one another in the device.

For a pressure generator with a high-pressure cylinder and a high-pressure plunger that can be moved in this cylinder, an axially identical arrangement of an electric linear motor has significant functional advantages.

A power flow takes place directly in the direction of movement of the high-pressure plunger without a usual path with a conversion of rotational energy into translational energy, whereby the inertial forces during acceleration or deceleration of the

Transmission parts are minimized

With a secure provision of high-pressure fluid in the high-pressure cylinder, a drive of the high-pressure plunger by means of an electric linear motor represents a highly economical solution for all operating modes and pumping of the fluid.

Electric linear motors have a simple design and direct, precise controllability for a direct translational working movement

an electrical control unit.

An electrical control unit, which includes an electrical power supply, a servo converter for one or more electrical linear motors, which can also be positioned in cooperating pressure generators, a programmable computing unit and measured value feeds, can coordinate the respective movement of the individual electrical linear motors with the

Precise control of high-pressure plungers.

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In one embodiment of the invention, the forcer of the linear motor and thus the high-pressure plunger can be moved at increased speed into any filling position in the high-pressure cylinder by means of the electrical control unit and in such a way for a programmable with secured fluid supply into the high-pressure cylinder

or adjustable high-pressure stroke.

According to the aforementioned embodiment of the invention, the device for the regulated provision of high-pressure fluid can be formed with two or more than two pressure generators, which are connected to a common high-pressure line. Connecting the electric linear motors to an electric control unit enables the pressure generators to be combined in terms of function with a view to reducing pressure fluctuations in the

High-pressure line or a requirement for a pulsation dampener.

In a further embodiment of the invention, the pressure generators are formed with two high-pressure cylinders with high-pressure plungers located opposite one another at a distance in the axial direction, and an electric linear motor connected to an electric control unit is positioned between these high-pressure cylinders. The forcer or the moving part of the linear motor has fastening means or power connections for the high-pressure plunger.

Advantageously, during the movements of the forcer of the electric linear motor, a filling with a fluid from a high-pressure cylinder and a pressure feed of high-pressure fluid into a high-pressure line from the opposite high-pressure cylinder with a

intermediate controllable electric linear motor take place.

It can also be advantageous for providing high-pressure fluid with low pressure fluctuations if two or more systems are connected to a high-pressure fluid line and the electric linear motors can be activated phase-shifted by an electric control unit.

To intensify the force effects of the high-pressure plunger in the

High-pressure cylinders can, or can with advantage, or the

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Pressure generators with two or more coupled electric linear motors can be driven in a regulated manner with an electric control unit, with a parallel or serial arrangement of the forcers of linear motors in the pressure system on the high-pressure plunger being usable to increase the translatory forces.

The present invention also relates to a method for providing high-pressure fluid with controllable parameters for consumers of the type mentioned initially, for example for water jet cutting systems.

Due to the general technological development in process engineering, especially in the above-mentioned systems, the shortcomings of the previous methods for providing high-pressure fluid with controllable parameters for consumers when using pressure generators with high-pressure cylinders and high-pressure plungers that can be moved in these must be eliminated, which is the further goal of the invention.

This goal is achieved in that the high-pressure plunger(s) is (are) moved by the electric linear motor(s), with the regulation of the process parameters being carried out by an electric control unit. The control unit includes a power supply, a servo converter for the electric linear motor(s), a programmable computing unit with measured value inputs of at least high fluid pressure and plunger position in the high-pressure cylinder(s) and regulates the servo converter.

The advantages achieved with the method according to the invention can essentially be seen in the fact that the electric linear motor(s) drives the high-pressure plunger(s) directly, ie an advantageous direct translational movement of the high-pressure plunger and forcer or drive is achieved.

The power flow in the high-pressure plunger is thus achieved in a favorable manner without converting rotational energy into linear energy, with a simple, robust, compact design of the transmission means, high accuracy due to increased recognition of the current position of the parts, improved

Precision of motion control at high speed and albeit too

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Force impacts of the stator in an anchoring of the same at a high acceleration of the forcer that are given in fractions of milliseconds.

In a preferred embodiment of the method according to the invention, it is provided that the high-pressure plunger transmits a signal to the control unit when a definable penetration depth into the high-pressure cylinder is reached, and the servo converter is regulated in such a way that the forcer of the linear motor moves the high-pressure plunger at increased speed into a changed position,

in particular in the starting position for a maximum pressure stroke.

Using the above embodiment of the method, it is advantageously possible to reduce the filling time of a high-pressure cylinder of the pressure generator and thereby to limit the pressure drop in the high-pressure fluid when using a high-volume pulsation damper.

When using two pressure generators in the system, which are operated phased by a control unit with linear motors controlled according to the above procedure, there is no need for a pulsation damper in the high-pressure line, because faster filling of the high-pressure cylinder with subsequent pressurization by the high-pressure plunger increases the pressure in the

High-pressure fluid is retained even when the pressure generator is changed in funding.

In order to provide a high-pressure fluid with minimal fluctuations in the case of two or more than two interacting devices, which are each formed with high-pressure cylinders with high-pressure plungers located opposite one another at a distance in the axial direction and have linear motors in between, which move the high-pressure plungers, it is advantageously provided that a control unit the linear motor movements of the individual devices are synchronized with a servo converter and according to an actual pressure determination

in the high-pressure line and the set specifications. In the following, the invention is based on basic sketches and schematic

Representations that only show one way of execution are explained in more detail

will.

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Show it:

Fig. 1 high-pressure pump with a pressure generator and el. Linear motor drive

Fig. 1A High-pressure curve pump according to Fig. 1

Fig. 2 high-pressure pump with phased pressure generator

Fig. 2A High-pressure curve pump according to Fig. 2

Fig. 3 High-pressure pump with two opposite pressure generators in the axial direction with an electric linear motor drive

Fig. 3A High-pressure curve pump according to Fig. 3

Fig. 4 high-pressure pump with synchronized pressure generators

Fig. 5 high-pressure pump with coupled linear motor drive

Fig. 6 high-pressure pump with longitudinally coupled linear motor drive

Fig. 7 high-pressure pump with two-stage pressure increase

The following list of reference symbols is intended to make it easier to allocate the parts and components in the illustrations and sketches:

D, D', D", D"* pressure generator

L, L', L" Electric linear motor P1, P2 Generating pressure

[p] pressure in high-pressure fluid [{f] time

1 fluid inlet

2 shut-off valve

3 pressure reducers

4 booster pump

5 filter unit

6 base plate

7 guide rail

8 guide carriages

9 stator

10 forcers

11 control line

12 Electrical control unit 13 Suction valve

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14 pressure valve

15 high-pressure cylinder 16 connection flange

17 High-pressure plunger 18 Plunger attachment 19 Connection plate 20 Pulsation dampener 21 Pressure sensor

22 High-pressure connection 23 Pressure relief valve 24 Drainage connection

Fig. 1 shows a high-pressure pump with a fluid inlet 1, a pressure generator D, an electric linear motor L and a high-pressure connection 22.

Because the high-pressure pumps shown in the schematic diagrams (FIGS. 1 to 7) can also be used advantageously as high-pressure pumps for water jet cutting systems, a water supply in the usual way has been drawn in schematically for the fluid supply.

The symbols mean: shut-off valve for the fluid: 2; Pressure reducing agent (if required): 3; Booster pump: 4 for rapid filling of the high-pressure cylinder: 15 of the pressure generator: D; Filter unit for cleaning the fluid: 5; Check suction valve: 13.

However, it is expressly stated that the high-pressure pumps according to the invention can be used in a favorable manner for all fluid media.

According to FIG. 1, a pressure generator D with a high-pressure cylinder 15 and a high-pressure plunger 17 that can be pushed into this is fixed on a base plate 6 via a connecting flange 16 . The high-pressure plunger 17 is moved via a plunger attachment 18 directly in the axial direction thereof by a forcer 10 of an electric linear motor L, with a stator 9 being connected to the base plate 6

connected is.

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In the description of an electric linear motor, the terms forcer and stator mean the moving part and the stationary part, regardless of the structure of the parts! It is also possible for the stator to be designed as a moving part and for the forcer to be stationary

is.

The electric linear motor L is connected to an electric control unit 12, which at least one electric power supply, a servo converter for the electric linear motor L, a programmable

Includes arithmetic unit and measured value feeds.

An electrical control unit 12 regulates the direction of movement of the forcer and a direct force effect on the high-pressure plunger 17 in a high-pressure cylinder 15 of a pressure generator D, with a non-return suction valve 13 being provided in the fluid inlet and a further non-return valve 14 for conveying high-pressure fluid.

In the area where high-pressure fluid is made available at a connection 22 , pressure fluctuations are to be kept low, which is accomplished by a pulsation damper 20 .

A pressure sensor 21 transmits the control unit 12 measured values for a respective fluid pressure in the high-pressure range, which measured values for controlling the

Linear motor movement can contribute.

As is known, a pressure relief valve 23 with a drainage connection 24 can be provided in the line 20 for the high-pressure fluid.

In Fig. 1A is a schematic diagram of a course of pressure [p] in the high-pressure line 22 of a device according to Fig. 1 as a function of time [t].

shown.

By a movement of the forcer 10 of the control unit 12 controlled

electric linear motor L, the high-pressure plunger 17 in the high-pressure cylinder

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15 is pressed, wherein in the high-pressure line 20 the fluid pressure [p] in the region a is reduced to an intended pressure p+; increases.

After a fluid delivery phase in region β, the high-pressure plunger 17 is returned by the forcer 10 of the electric linear motor L, which return stroke can be done at increased speed or in a shorter time, controlled by the electric control unit 12 .

The pressure valve 14 closes and the fluid pressure in the pump system would fall to an ambient pressure as a result of a withdrawal in the region v of the illustration according to FIG. 1A. However, by means of a pulsation damper 20 in the high-pressure line, high-pressure fluid is subsequently supplied to the

System, so that a pressure drop p» in area 6 is delayed.

When the high-pressure plunger 17 reaches the starting position in the high-pressure cylinder 15, a renewed pressure phase of the forcer 10 immediately follows, as a result of which the pressure drop pz in the fluid is intercepted in area 5 of the diagram and the specified delivery pressure p+; is adjusted again.

In Fig. 2 is a high-pressure pump with phased, or in phase

operated pressure generator D shown.

The individual pressure generators D, D', D" are each constructed in the same way as that shown in FIG. 1, but the associated electric linear motors L, L', L" are connected to a control unit 12 which controls the movement of the high-pressure plungers 17, 17°, 17". In this way, fluid delivery into the high-pressure line 20 is balanced and pressure fluctuation therein is minimized, as illustrated in FIG. 2A.

3 schematically shows a high-pressure pump with two opposite pressure generators D and D' in the axial direction, with an electric linear motor in between. Although such a positioning of pressure generators D, D 'is known per se, but by arranging an intermediate

electric linear motor L with a control unit 12 in terms of system technology and

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achieves decisive advantages in terms of process technology, which also solve problems in the prior art from an economic point of view.

In detail, the forcer 10 of an electric linear motor L by means of plunger attachments 18, 18' with the opposite high-pressure plungers 17, 17' of the two high-pressure cylinders 15, 15' of the pressure generator D, D' is a highly advantageous, compact, backlash-free, lightweight unit

tied together.

When high-pressure fluid is removed from a connection 22, the function of the electric linear motor L is regulated directly by the electric control unit 12. A linear movement of the forcer 10, in whatever direction, causes fluid to be delivered to a pressure generator D and at the same time to the opposite pressure generator D' a filling of the high-pressure cylinder 17°.

A representation of the pressure [p] over time [t] in an aforementioned high-pressure pump in operation is shown in FIG. 3A.

The two high-pressure cylinders 15, 15', which deliver alternatively and are filled with fluid, cause a largely stable delivery pressure p+ in the high-pressure fluid with small drops in pressure p»2, caused by a switchover of the two pressure generators D, D'.

A high-pressure pump with synchronized pressure generators can be seen schematically in FIG.

Such a fluid delivery device, which has minimal pressure fluctuations in the area of the high-pressure connection 22, is formed with four synchronized pressure generators D, D', D", D'" or with two devices with pressure generators located opposite one another in the axial direction.

In such a high-pressure pump, as shown in Fig. 4, the electric linear motors L, L 'by means of the electric control unit 12 such

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synchronously regulated that at all times at least one pressure generator D promotes high-pressure fluid under the conditions determined by the electrical control unit 12 .

An intensification of the pressure forces on the high-pressure cylinders 17 from the pressure generator D by means of coupled electric linear motors is shown below

schematic representations disclosed.

5 shows a high-pressure pump with two pressure generators D, D' lying opposite one another in the direction of the axis. To increase the translatory forces between the hydraulic pressure generators D, D', a

Arrangement of electric linear motors L is provided.

Fig. 6 shows schematically a serial arrangement of electric linear motors L,

L' between the hydraulic pressure generators D, D'.

7 shows a high-pressure pump with a double pressure increase by two pumps driven by electric linear motors L, L'.

The first pressure increase of the fluid from an inlet pressure 1 in a high-pressure area takes place by means of a first linear motor pump system. From this high-pressure area, a further increase in the pressure of the high-pressure fluid is brought about by means of a second electric linear motor pump system. The control unit 12 regulates and coordinates the two electric linear motors L, L' of the two pumps.

Claims (10)

15 20 25 30 13 patent claims 1. Device for the regulated provision of high-pressure fluid by means of a pressure generator (D) formed with a fluid supply and a fluid inlet (1) in the high-pressure cylinder (15) and a high-pressure plunger (17) movable in this with a drive of the same and a supply of high-pressure fluid in a high-pressure line (22 ), optionally with a pulsation damper (20) in this, with a pressure sensor (21) for controlling the drive and optionally with a switchable pressure relief valve (23), characterized in that the pressure generator (D) or several cooperating pressure generators (D, D') each having an electric linear motor (L) with stator (9) and forcer (10) for driving the high-pressure plunger (17) in the high-pressure cylinder (15) and the electric linear motor(s) (L, L') with an electrical control unit (12) which has an electrical energy supply, a servo converter for electrical linear motors (L), a programmable computing unit and measured value additions includes, is (are) connected. 2. Device according to claim 1, characterized in that the pressure generator (D) is formed with a high-pressure cylinder (15) and the high-pressure plunger (17) from each determined position in the high-pressure cylinder (15) with a secured fluid inlet (1) in this by means of a electric linear motor drive (L) can be moved by an electric control unit (12) and can be positioned in such a way for a programmed and controllable high-pressure stroke. 3. Device according to claim 1, characterized in that this device is formed with two or more than two pressure generators (D, D', D'") according to claim 2, which pressure generators (D) are connected to a common high-pressure line (22). stand and the electric linear motors (L) have a connection to an electric control unit (12) and so functionally can be coordinated. 4. The device according to claim 1, characterized in that the pressure generator (D, D') with two opposite ones at a distance in the direction of the axis High pressure cylinders (15, 15 °) formed with high pressure plunger (17, 17 °) and between 15 20 25 30 14 a linear motor (L) connected to an electrical control unit (12) is positioned in these high-pressure cylinders (15, 15°) and power connections or plunger attachments (18, 18°) are spaced apart in the longitudinal direction on the forcer (10) of the linear motor (L), which are connected to the respective connecting parts for a plunger movement are arranged standing. 5. Device according to claim 4, characterized in that two systems are connected to a high-pressure fluid line (22) and the electric linear motors (L, L') can be driven out of phase by an electric control unit (12). 6. Device according to claim 1, characterized in that the pressure generator(s) (D) can be driven in a regulated manner with two or more coupled electric linear motors (L, L) with an electric control unit (12). 7. Method for providing high-pressure fluid (22) with controllable parameters for consumers when using pressure generators (D, D', D", D"") with high-pressure cylinder (15) and high-pressure plunger (17) moved in this, characterized in that the high-pressure plunger(s) (17) is (are) moved by the electric linear motor(s) (L, L', L'"), with the process parameters being regulated by means of an electric control unit (12), which control unit (12) an energy supply, a servo converter for the electric linear motor(s) (L, L', L'*), a programmable arithmetic unit with measured value inputs of at least fluid high pressure (21) and plunger position in the (the) high pressure cylinder (n) (15) and performs control of the servo converter. 8. The method according to claim 7, characterized in that the high-pressure plunger (17) transmits a signal to the control unit (12) when it reaches a definable immersion depth in the high-pressure cylinder (15) and the servo converter is regulated in such a way that the forcer (10) of the Linear motor (L) spends the high-pressure plunger (17) at increased speed in a changed position, in particular in the starting position for a maximum pressure stroke. 9. The method according to claim 7, wherein two or more than two pressure generators 15 15 (D, D', D", D"') with a function according to claim 8 are brought together in a fluid high-pressure line (22), with the proviso that the electric linear motors (L, L') are controlled by servo converters by means of a control unit (12). , L'") are operated in a phased manner, i.e. after a pressure phase or delivery phase of a first pressure generator (D), during which at least one further pressure generator (D') delivers high-pressure fluid, the high-pressure cylinder (15) is filled and pressure builds up in the fluid in the first pressure generator (D) in such a way that towards the end of the pressure phase of the further pressure generator(s) (D', D") the first pressure generator (D) takes over the delivery of fluid and a pressure drop in the fluid high-pressure line (22) is avoided. 10. The method according to claim 7, wherein two or more than two cooperating devices, which are each formed with high-pressure cylinders (15) with high-pressure plungers (17) spaced apart in the axial direction and located opposite one another and have linear motors (L, L') in between, which have the high-pressure plungers ( 17) move with the proviso that a control unit (12) with a servo converter synchronizes the linear motor movements of the individual devices and corresponds to an actual pressure determination (21) in the high-pressure fluid (22) and regulates the pressure specifications.