ES2773043T3 - Pump device - Google Patents

Abstract

Pump device (1) with a pushbutton as actuating element for a main pump head (11), which is located in a supply line (15), and whose working space (18) is provided with a check valve (16) on the suction side, and of a check valve (17) on the pressure side, where the working space (20) of the push button is connected through an oscillating conduit (12), loaded by means pumping (21), to the working space (18) of the main pump head (11), so that the button draws, oscillating pumping medium (21), from the supply line (15) towards the working space (18) of the main pump head (11) or presses from the work space (18), a ventilation valve (9) being provided to ventilate the work space (20) of the push button, characterized in that the ventilation valve (9) is a time controlled valve and / or pressure controlled double seat valve ion and because a device is provided for introducing a liquid into the working space of the button and / or of the oscillating conduit (12).

Description

DESCRIPTION

Pump device

The invention relates to a pump device with a push button as the actuating element for a main pump head, which is located in a supply line, and whose working space is provided with a check valve on the suction side and a check valve on the pressure side, according to the preamble of claim 1.

In the sense of the present description of the invention, a diaphragm pushbutton is to be understood as corresponding to a piston diaphragm pump which does not necessarily have non-return valves on the suction and pressure side, but otherwise As a general rule, it has all the characteristics of a piston diaphragm pump. By a piston diaphragm pump, the person skilled in the art understands a diaphragm coupled plunger pump, wherein the deflection of the plunger is transmitted through a hydraulic coupling to the diaphragm. Diaphragm pushbuttons can have, in particular like piston diaphragm pumps, a refilling and / or venting device preferably with diaphragm position control for hydraulic fluid as known, for example from EP 0085725 A1 . In particular the invention relates to a pump device with a push button, in particular a membrane push button, as an actuating element for a main pump head, which is located in a supply line and whose working space is provided with a check valve on the suction side and a check valve on the pressure side. The pulsator workspace is connected via a pump-loaded oscillating line directly to the main pump head workspace so that the pulsator sucks in oscillating pumping medium from the supply line into the workspace. from the main pump head or press from the workspace. The pump device according to the invention is especially good for conveying suspensions, for example biomass-water mixtures above the critical point, and in particular suitable for high pressures and temperatures.

Pumps of this type are known from EP 0919724 B1, US 3,216,360 and EP 1898093 A1. In this sense, a main pump head located in the supply line is actuated by an additional pump head called a push button. Such a pump device is also called a remote head pump ( "remóte head '). Such pump devices are normally used for pumps of liquids with a high percentage of solids and high temperatures. However, the pumps can be used without problems. in particularly aggressive feed media, such as aqueous solutions above the critical point, in particular when processes with a large volumetric flow rate under high temperatures and high pressures are present. Another type of pump device, and in particular a metering pump membrane for dosing an effervescence gas is described in document US 2004/062662 A1. This pump has a pump head with a product chamber with an inlet end with an inlet valve and an outlet end with an outlet valve. A movable membrane element defines a boundary of the product chamber. The membrane element can reciprocate to cause pump displacements. An outlet side is arranged downstream of the outlet valve. A passage is arranged in fluid connection between the delivery side and the product chamber. A valve is arranged in the passage. The valve is opened intermittently so that the liquid in an amount can return to the product chamber with which the gas can be removed from the product chamber to avoid a leak through ventilation.

The invention is based on the aim of indicating a pump device of the type mentioned at the beginning that can be used for pumps of aggressive feed media with high temperature, and that, however, works with low costs with high reliability, whereby in particular Solid particles should be prevented from entering the button.

This object is achieved by means of a pump device according to the features of independent claim 1. Advantageous embodiments of the invention are indicated in the dependent claims. According to the invention a pump device with a push button as actuating element for a main pump head is indicated, which is located in a supply line and the working space of which is provided with a check valve on the suction side and a check valve on the pressure side, the pulsator working space being connected via an oscillating line loaded by pumping to the main pump head working space so that the pulsator sucks in oscillating pumping medium from the line supply to the main pump head workspace or presses from the workspace, a vent valve being provided to vent the pulsator workspace, the vent valve being a time-controlled valve and / or a valve pressure controlled double seat and a device is provided for introducing a liquid into the working space of the push button and / or oscillating driving.

The use of a time controlled valve and / or a pressure controlled double seat valve has the advantage that the time in which the valve is open for ventilation can be kept very short, so double flows can be avoided that could result in a reinforced entry of solid particles into the pulsator.

Introducing liquid into the pulsator workspace or recharging pumping medium in the workspace for loss compensation for example by ventilation of the workspace has the advantage that no liquid compensation needs to be performed by means of the main pump head driven and consequently no solid particles are transported from the main pump head to the pulsator. Preferably the liquid is water and / or pumping medium and / or other suitable liquid.

Preferably the device for introducing a liquid into the workspace of the pushbutton and / or the oscillating conduit comprises a time and / or pressure controlled refill valve and / or a refill tank.

Preferably the recharge valve or vent valve controlled by time and / or by pressure is controlled by time and / or by pressure so that after a start-up phase of the process the recharge valve or vent valve is closed and / or the upper limit value to close the recharge valve or time and / or pressure controlled ventilation valve after a process start phase increases and / or after a process start phase the lower limit value to close the recharge valve or time and / or pressure controlled ventilation valve descends.

Preferably the pressure with which the refill tank is stressed corresponds essentially to the pressure in the working space of the push button.

Preferably the refill valve between the workspace and the refill tank is a time and / or pressure controlled valve. Preferably the working space of the pushbutton is connected via the and / or an additional vent valve to the suction side of the supply line.

Preferably, in this case, the suction side of the supply line is advantageously arranged for automatic ventilation above the ventilation valve.

Alternatively or additionally the working space of the pushbutton is preferably connected via the and / or an additional vent valve to the pressure side of the supply line.

Preferably the vent valve has a forced control in connection with a return pump, in particular a time control.

Alternatively or additionally preferably the pushbutton working space is connected via the and / or an additional vent valve to a refill tank to compensate for the leakage loss in the pushbutton working space and / or the oscillating line .

Alternatively or additionally, the working space of the pulsator is preferably connected via the and / or an additional ventilation valve to a collecting container to collect and eventually return pumping medium exiting during ventilation.

Preferably the valve is time and / or pressure controlled such that it is at least closed above a certain pressure. The pushbutton generates a pressure in the workspace in continuous alternation with a pressure phase and a suction phase. In order to prevent a weakening of the flow from the oscillating line for the expulsion of possibly aspirated solid particles, at least from a certain pressure in the working space, no ventilation should be produced to prevent a pressure drop, even if it may be small in the workspace and thus a reduction in flow from the oscillating drive.

Preferably the valve is time and / or pressure controlled such that it is closed at least below a certain pressure.

As an alternative or additionally, a ventilation below a certain pressure in the working space of the button is preferably avoided, since by reducing the pressure, even if it is small, a greater suction power would appear and therefore a more intense flow in the towards the Oscillating conduction, which could suck more solid particles into the oscillating conduction. Therefore, the valve preferably at least below a certain pressure in the working space is closed.

Preferably the ventilation is carried out only in the lateral zones between the suction phase and the pressure phase, where there is essentially little or no flow of the feed fluid towards the oscillating line. Thus the flow of solid particles into the oscillating line can be prevented.

Preferably the pump device has a refill tank for recharging the pumping medium which is it is applied with a pressure, which essentially corresponds to the system pressure.

Preferably in all embodiments of the invention the oscillating conduit is provided with a cooling element.

Preferably in all embodiments of the invention the push button is arranged above the main pump head. Additionally or alternatively preferably the oscillating line is oriented depending from the push button towards the main pump head. Embodiments of the invention of this type have the advantage that gravity further counteracts an entry of solid particles through the oscillating conduits of the push button.

The oscillating line is preferably provided with a recess as a receiving space for solid particles in the pumping medium.

Preferably the working space of the button is at least temporarily stressed with a compensating means to compensate for the leakage loss.

Preferably the oscillating conduit in at least one section is subdivided into at least two parallel partial sections.

Preferably the oscillating line is also divided along its entire course, that is to say that for example two or more parallel oscillating lines are provided.

These embodiments of the invention have the advantage that the provision of a corresponding control, for example in the suction phase, opens at least two partial sections and in the pressure phases at least one partial section (in the case of two partial sections , preferably alternating between one and the other partial sections), it is closed at least partially, and preferably completely at least during a part of the pressure phase to prevent accumulations of solid particles in the partial sections due to the higher exit velocity consequently in the other partial section (s).

Preferably the volume of the parallel-running partial sections of the oscillating line or the volume of the oscillating lines running in parallel in each case is at least the same size or preferably greater than the displacement volume of the pushbutton. This development of the invention has the advantage that an escape of solid particles in the remaining oscillating line and / or the push button can be prevented with greater probability.

Preferably, control valves are provided for the at least partial opening and closing of the partial sections of the oscillating line or of the parallel oscillating lines.

Preferably a sensor system is provided to synchronize the time control of the control valves with the phase position of the push-button membrane. For example, a sensor and / or switch is provided which in the case of at least one position of the diaphragm of the button switches the control valve. Alternatively or additionally, a sensor and / or switch is provided for the other diaphragm position in order to switch the control valve. As an alternative, the control valves are also only moved into a closed or partially closed position during a part of the pressure phase. It would also be conceivable during a pressure phase to close different control valves in succession at least partially.

Preferably the oscillating line preferably in the area in front of the main pump head is subdivided into several lines connected in parallel, preferably two lines connected in parallel which can be closed at least partially and preferably completely by a time-controlled and / or time-controlled valve. pressure at least partially.

The time control and / or pressure control is preferably set in such a way that during the suction phase all lines are open for as long as possible so that the flow is distributed in the various parallel lines, while in the pressure phases alternatively, a partial line with full pressure and thus a substantially higher flow rate are required. Therefore, the ingress of solid particles into the oscillating line should be safely prevented.

Preferably the main pump head has at least two check valves connected in parallel on the suction side.

This embodiment of the invention has the advantage that during the pressure phase in the pipe section between the outlets of the two check valves on the suction side a higher flow velocity is generated so that the danger of ingress of Solid particles in the oscillating conduit from the check valve on the suction side downstream with respect to the flow direction during the pressure phase is reduced.

Preferably the cross section of the pipeline housing the check valve on the downstream suction side with respect to the flow direction during the pressure phase is larger than the cross section of the pipeline housing the other check valve in the suction side.

This is the preferred embodiment of this preferred embodiment, as more solid particles are then transported through the conduit which offers high safety with respect to solid particles entering the oscillating conduit. As an alternative, the cross sections of the two lines could also be of the same size or more than two lines and a corresponding number of check valves could be provided on the suction side. A larger cross-section of the pipeline housing the check valve on the suction side upstream with respect to the flow direction during the pressure phase would also be conceivable, which always offers an advantage, albeit less with respect to the embodiments with only one check valve on the suction side.

Preferably, a separating piston is arranged in the oscillating line.

These embodiments of the invention have the advantage that the separating plunger prevents solid particles from reaching the pulsator via the oscillating line from the main pump head.

Preferably the mentioned embodiments of the pump device according to the invention are configured with a double action pushbutton and two pump circuits controlled in opposite directions.

Preferably, the pushbutton is configured as a double-action pushbutton, one of the sides of which is configured as an actuating element for the main pump head, and the other side of which is stressed with a pressure, which essentially corresponds to the system pressure.

Embodiments of the invention with a double-acting pushbutton for actuation of two pump circuits controlled in opposite directions are preferred since a uniform lift can be achieved by them. Furthermore, the pushbutton can be actuated in the case of high suction pressures of for example 250 bar with an actuator designed for essentially lower pressures, when for example a double-acting piston is used which must only overcome the differential pressure between the pressure during the pressure phase in one of the button halves and the pressure during the suction phase in the other button half in each case. This advantage is also valid for double-acting pushbuttons for actuation of only one pump circuit when the other side of the pushbutton, which does not actuate the pump circuit, is pressed with pressure. Advantageously, then, in embodiments of the invention with a refill tank for the membrane control space (s) of the button, the refill tank is loaded with a pressure that corresponds approximately to the system pressure so that the actuation also in the process of recharging, which takes place with valve control, when the diaphragm reaches its rear mechanical installation it is not subjected to a pressure higher than the differential pressure between suction phase and pressure phase, and therefore does not need to be dimensioned larger, and the membrane is also not destroyed in the blowing channels of its subsequent mechanical installation. Preferably a membrane position-controlled recharging and / or ventilation device for hydraulic fluid can be provided on the push-button, as known, for example, from EP 0085725 A1.

Preferably there is compensation means to compensate for the leakage loss in the membrane control space in a refill tank which is connected through a valve to the membrane control space, the refill tank being stressed with a pressure that is more higher than atmospheric pressure. This embodiment of the invention has the advantage that the pushbutton can be actuated with a drive (for example, hydraulically, mechanically and / or pneumatically, for example a piston drive) whose power only has to exceed the pressure difference between the suction side and the pressure one. Furthermore, by applying pressure to the refill container to compensate for leakage loss in the diaphragm control space, a jerk towards the drive, for example the piston, can be prevented. Advantageously, this pressure in the refill tank can correspond approximately to the system pressure. According to a further advantageous embodiment of the invention, a pressure regulation adapted by means of the regulation circuit to the system pressure in the refill tank is provided, as is described for example in EP 1 898093 A1.

Preferably the push button is made of a membrane or tubular membrane type of construction.

Preferably the push button is made of a plunger or plunger type of construction.

A fundamental idea of the invention therefore also resides in the fact that the pushbutton requests a main pump head, which in principle is designed as a piston pump head, without however requiring a piston. In this way, a standard component suitable for high temperatures and pressures can be used as the pump head, which in combination with a standard diaphragm push button represents an affordable alternative to known solutions, while maintaining the principle of a pump. remote head ("remóte head"). Wear is further reduced because the particles possibly present in the pumping medium do not come into contact with the working space of the pulsator, since the liquid in the oscillating line only moves back and forth in the range of the pump lift, and it mixes only slightly with liquid that has just been aspirated. The pushbutton can be made of a membrane or tubular membrane type of construction as well as a plunger or plunger type of construction. If the button is a membrane button, the particles do not reach the membrane. Since the high temperatures in the pump medium also decrease during oscillating conduction, diaphragm pushbuttons with inexpensive plastic membranes, for example made of PTFE, can also be used in the case of high pressures and high temperatures in the pipeline. feeding. Therefore, the pump devices according to the invention are especially suitable for conveying biomass in the manufacture of biofuel.

An additional advantage is that due to the ventilation, gases cannot accumulate from the pumping medium or air inclusions in the pump space of the pulsator, but instead return to the process. Preferably the inlet in the supply line on the suction side is for this purpose located above the vent valve, so that the gases automatically exit from the working space. Alternatively a forced guide may be present, for example with a time and / or pressure controlled valve.

A preferred development of the invention is to relieve the diaphragm pulsator even more of the load in terms of temperature, is that the oscillating line is provided with a cooling element.

In addition, the fact that the oscillating line is oriented downward from the diaphragm button towards the main pump head has proven to be advantageous. The particles therefore remain in the area of the main pump head and return to the supply line.

As an alternative, it can be advantageous if the oscillating line is provided with a recess as a receiving space for solid particles in the pump medium. An area is therefore provided in the oscillating line which is located below the working space of the diaphragm button, so that the particles accumulate there due to gravity and do not reach the working space of the button.

It is desirable that the working space of the pulsator is stressed with a compensation means to compensate for the leakage loss so that an oscillating line flow and a displacement of solid particles towards the pulsator are prevented.

In order to further protect the pushbutton against solid particles from the pumping medium, a further advantageous embodiment of the invention consists in providing a separating piston in the oscillating line. This measure separates the part of the oscillating conduit associated with the push button from the part that is associated with the main pump head.

Low motive power is achieved by having a double action pushbutton and two pump circuits controlled in opposite directions, which is especially advantageous when used in recirculation processes with high suction pressures.

The invention is further explained in more detail below by means of exemplary embodiments. They show schematically:

Figure 1 a vertical section through a first embodiment of a pump device;

FIG. 1A is a vertical section corresponding to FIG. 1 through an additional pump device according to the invention with a double action pushbutton and two pump circuits controlled in opposite directions. FIG. 2 a connection diagram of a pump configuration consisting of two pump devices according to FIG. 1 according to the invention;

Figure 3 features of additional embodiments of a pump device according to the invention.

Figure 4 a connection diagram corresponding to Figure 2 of a pump configuration according to the alternative invention;

Figure 5 a connection diagram corresponding to Figure 2 of a pump configuration according to the further alternative invention;

Figure 6 a connection diagram corresponding to Figure 2 of a pump configuration according to the further alternative invention;

Figure 7 a connection diagram corresponding to Figure 2 of a pump configuration according to the further alternative invention;

figure 8 features of further embodiments of a pump device according to the invention.

Figure 9 features of further embodiments of a pump device according to the invention.

FIG. 10 a connection diagram of a pump configuration according to the invention consisting of two pump devices according to FIG. 1;

FIG. 11 is a p-V diagram of the course in time of the pump pressure on the displacement volume with an indication of a possible recharge during the pressure phase.

FIG. 12 is a p-V diagram of the course in time of the pump pressure over the displacement volume with an indication of a possible recharge during the suction phase.

The following reference symbols are used in the description of the embodiments:

I pump device

4 connection (for a refill tank)

5 pressure side (of supply line)

6 direction of transport

7 connection (for oscillating driving)

8 connection (for a ventilation)

9 vent valve

10 membrane button

I I main pump head

12 oscillating driving

12 'oscillating driving

121 Partial Section of Oscillating Drive

122 part section of the oscillating line (connected in parallel to part section 121 of the oscillating line)

123 control valve (preferably a pressure or time controlled shutoff valve)

124 control valve (preferably a pressure or time controlled shutoff valve)

13 entry

14 departure

15 suction side (of supply line)

16 check valve on suction side

161 check valve on suction side

(connected in parallel to check valve 16 on suction side)

17 check valve on pressure side

18 workspace (from main pump head)

20 workspace (of the membrane button)

21 pumped liquid

22 control input (from main pump head)

23 cooling jacket

24 solid particles

25 section (in oscillating driving)

26 membrane

27 membrane control space

28 plunger

281 disc

29 motor

30 deposit refill

31 valve

32 separating plunger

33 zone (on the side of the main pump head)

34 zone (on the membrane button side)

35 transport direction separating piston

36 collecting container

37 membrane check space refill valve

38 hydraulic pump

39 diaphragm control space vent valve

According to FIG. 1, a pump device 1 has a membrane pushbutton 10 serving as a pushbutton, a main pump head 11 and an oscillating line 12. The main pump head 11 has an inlet 13 and an outlet 14 for mounting in a supply line, the pressure side of which is designated 5 and the suction side of which is designated 15. On the inlet side (suction side) a check valve 16 is present in the suction side and on the outlet side (pressure side) a check valve 17 on the pressure side. The direction of transport is marked with the arrow 6. As regards construction although the main pump head 11 corresponds to a pump head of a plunger pump. However, it does not have a plunger. Its working space 18 is rather directly connected via the oscillating line 12 to a working space 20 of the membrane button 10. The membrane button 10 is provided with a connection 7 for the oscillating line 12. Furthermore, it is present a connection 8 for a vent of a vent valve 9 (figure 2) and a connection 4 for a refill tank 30 (figure 2). Consequently, the oscillating stroke of the diaphragm pulsator 10 causes the transport in the main pump head 11 through the liquid column in the oscillating line 12.

The oscillating line 12 is charged with pumped liquid 21. It is guided through a control inlet 22 of the main pump head 11 towards the working space 20 of the diaphragm pulsator 10. The oscillating line 12 is provided with a cooling element which is formed by a cooling jacket 23 urged by a cooling liquid. In this way a temperature drop of, for example, about 360 <0> C can be carried out in the main pump head 11, as the biomass to be transported in the manufacture of biofuel normally exhibits, to about 100 < 0> C on the membrane button 10.

Since the oscillating line 12 contains the pumping liquid 21, which can also contain solid particles 24, there is a section 25 in the oscillating line 12 that descends from the diaphragm pulsator 10 towards the main pump head 11, and which empties directly into the workspace 18 of the main pump head 11. In its deepest place the oscillating line 12 is therefore located at the level of the workspace 18 of the main pump head 11. The solid particles 24 therefore remain due to gravity in the working space 18 of the main pump head 11 and do not reach the working space 20 of the diaphragm pulsator 10. Rather, they are fed into the supply line 5 on the pressure side. The diaphragm pushbutton 10 has a diaphragm 26 which is actuated hydraulically via a diaphragm control space 27. Preferably PTFE is suitable as diaphragm material. As an alternative, elastomers, metallic materials or composite materials can also be used. The diaphragm control space 27 is actuated by a piston 28 which is actuated mechanically, for example by a motor 29 (FIG. 2), and / or hydraulically and / or pneumatically, for example by alternating pressure from the chambers to the side of the disc 281. To compensate for leaks there is a refill tank 30 loaded with a compensation means that through a controlled valve 31 (FIG. 2) emits compensation means into the working space 20 of the membrane button 10. The feed in figure 2 is marked with 4.

With reference to Figure 1 and Figure 2 below, the function of the pump device is described. The configuration shown in figure 2 presents a double action pushbutton with two pump devices, as illustrated in figure 1. The pump devices are connected in parallel in two branches A, B controlled in opposite directions. Mainly a branch pumping operation is described. In an initial state the plunger 28 is inserted into the membrane control chamber 27 and the membrane 26 is bulged in the working space 20 of the diaphragm pushbutton 10. The oscillating line 12 and the working space 18 of the main pump head 11 are fully charged with pumped liquid. The check valve 16 on the suction side and the check valve 17 on the pressure side are closed.

If the piston 28 extends, this causes a flattening of the membrane 26 and a negative pressure in the working space 20 of the diaphragm pulsator 10. The negative pressure acts through the oscillating line 12 in the working space 18 of the pressure head. main pump 11, so that the check valve 16 on the suction side is opened and pumped liquid 21 is drawn in from the suction side 15 of the supply line. During the subsequent opposite stroke of the piston 28 in the bulge of the diaphragm 26, pressure is generated in the working space 20 of the diaphragm push-button 10 which acts via the oscillating line 12 on the working space 18 of the main pump head 11 The pressure causes a closing of the check valve 16 on the suction side and an opening of the check valve on the pressure side 17, so that pumped liquid 21 is pumped to the pressure side 5 of the line feeding. By means of the oscillating movement of the piston 28, a continuous transport is thus carried out.

By controlling two main pump heads 11 in opposite directions by means of the double-acting pushbutton 10 which is preferably implemented in the membrane construction mode, the suction pumping operations are overlapped with the two circuits A and B in such a way that in particular in recirculation processes with high system pressure and relatively low differential pressure between suction line and pressure line, only low power is required for actuation. As an alternative each main pump head 11 can be controlled with a single effect pushbutton in the same or opposite directions.

In figure 3, as a detail of a second embodiment, a section of an oscillating conduit 12 'is illustrated. To separate the liquid column in the oscillating line 12 'a separating piston 32 longitudinally movable according to the double arrow 35 is arranged in the oscillating line 12 '. Any solid particles 24 that may be present therefore remain in a zone 33 on the side of the main pump head 11 and cannot reach a zone 34 on the side of the diaphragm pulsator. Figure 1A shows an embodiment with a double action pushbutton. Figure 1A corresponds essentially to the embodiment shown in Figure 1, the pump device of Figure 1 being present essentially twice and actuated by a common plunger 28. The double action pushbutton is represented extremely simplified in figure 1A, that is to say without actuation and without hydraulic reservoir and its pressure-activated recharge valves. The double-acting piston 28 describes an end position (on the right, the diaphragm 26 is bulged, that is, the pressure stroke or the pressure phase has ended; on the left, the diaphragm 26 is flattened, that is, the suction stroke or the aspiration phase is over).

The embodiments of the invention shown in Figures 2, 4, 5 and 6 differ essentially only by different ventilation or recharging. The same components and features are described by the same reference numbers. Regarding the embodiments of Figures 4, 5 and 6, reference is therefore made to the previous description of the embodiment of Figure 2 and only the differences with respect to the embodiment of the invention are described below.

Figure 2 shows an embodiment with ventilation towards the suction line 15. Recharging takes place from a pressure accumulator 30 (with gas cushion) with time or pressure control during the push-button pressure stroke. The switch sign used for valve 31 describes a controlled check valve in which closure is prevented during control. The pressure in the recharge accumulator 30 must be greater than the system pressure. The recharge volumetric flow must be greater than / equal to the leakage current of the ventilation operation. A following regulation of the varying accumulator pressure is recommended depending on the varying system pressure. In an emergency, manual control is also possible.

FIG. 4 shows an embodiment with ventilation towards the pressure line 5. Recharging takes place from a pressure accumulator 30 (with gas cushion) with time or pressure control during the suction stroke of the push button. The switch sign for valve describes a controlled check valve in which opening is prevented during control. The pressure in the recharge accumulator 30 must be greater than the suction pressure. The recharge volumetric flow must be greater than / equal to the leakage current of the ventilation operation. A subsequent regulation of the accumulator pressure depending on the varying suction pressure is recommended. In an emergency, manual control is also possible.

Figure 5 shows an embodiment with a vent to the refill tank 30. Refill is performed from a time-controlled pressure accumulator 30 (with gas cushion). The symbol for the recharge valve 31 does not show any specific function.

FIG. 6 shows an embodiment with ventilation in any collection or accumulator container 36. Recharging takes place from a time-controlled pressure accumulator 30 (with gas cushion). The symbol for the recharge valve 31 does not show any specific function.

Figure 7 shows an embodiment of the invention of a pump device with a single acting push button. The ventilation or recharging can be carried out corresponding to the aforementioned embodiments of the invention, for example according to FIG. 2, FIG. 4, FIG. 5 or FIG. 6. By way of example, the ventilation to pressure line 5 is shown. as one of the possible variants.

In the embodiment of FIG. 7, instead of the single-acting pushbutton, a double-acting pushbutton could also be used, the unused side of which is applied with a pressure that roughly corresponds to the system pressure, for example by means of a pressure accumulator. The advantages of a pressure-stressed recharging medium for recharging in the membrane control space could thus be exploited. Furthermore, by applying pressure on the side of the double-acting button not used, the advantage is that a smaller dimension drive can be used when high pressures of for example 250 bar must be exceeded by the pump head actuated by the button.

Figure 8 shows a possible configuration of the main pump head 11 of pump devices according to the invention. On the suction side of the main pump head, two check valves 16, 161 are provided on the suction side, which can also have a different size. This embodiment has the advantage that a higher flow rate is generated during the push-button pressure stroke in the line section between the two check valves on the suction side.

The oscillating line 12 has a slope towards the check valves on the suction side 161, 16. In the suction the suction flow according to the cross-sectional relationships is distributed to the check valves on the suction side 161 and 16. For this reason, during the suction it is achieved that in the oscillating pipe section between these two check valves on the suction side a lower flow takes place than it would be when the entire amount of suction is sucked in only via the check valve 16 on the suction side.

The entire flow of the pump flows through the pressure stroke through the oscillating line. This leads to a flow through the oscillating line that is directed more strongly towards the check valve on the suction side 16 overall.

This flow could make the main flow accumulations return rather each time.

Figure 9 shows a possible configuration of the oscillating line 12 of pump devices according to the invention. The oscillating line at least in one section is subdivided into at least 2 sub-sections 121, 122 which with the aid of shut-off valves 123, 124 controlled in the suction phase are used at the same time for the suction and in the pressure phases can be opened and closed alternately in each case to prevent accumulations in the partial sections 121, 122 of the solid particles by the consequently higher exit velocity generated.

The loading volume of each partial section 121, 122 should preferably be at least exactly the same size and preferably greater than the displacement volume of the push button. Thus, solid particles are prevented from reaching behind the control valves by alternating closing in the pressure phase.

In a first suction operation, each partial section would initially be loaded with particles up to a maximum of half its volume. The closed partial section below would possibly maintain this state. In the case of a new suction operation, the partial section would then be fully loaded with particles at most before a complete washing was carried out in the pressure phase.

In the embodiment shown in FIG. 9, time-controlled shut-off valves 123, 124 are provided which with the aid of sensor systems should be exactly synchronized with the respective phase position of the push-button diaphragm.

Figure 10 shows a further embodiment of the invention. The same parts are provided with the same reference numbers. Reference is made to the description of the aforementioned embodiments. In FIG. 10 the pushbutton is represented somewhat more detailed, the actuation for the double-acting piston 28 not being represented. In particular, the course of the hydraulic channels of the double action button is represented in more detail.

The pump device of FIG. 10 has two recharge valves 37 of the diaphragm control space which are preferably actuated with a pressure corresponding approximately to the system pressure. The pressure is supplied by a hydraulic pump 38. Otherwise two ventilation valves 39 are provided for the ventilation of the diaphragm control spaces.

Figures 11 and 12 show schematic PV diagrams that represent the evolution in time of the pump pressure with respect to the displacement volume. Starting at the point on the lower left side, the steep flanks of the pressure rise during the compression phase, the pressure fluctuations due to valve kinetics, the expulsion of the displacement volume (pressure plus high with maximum piston speed), as well as the equally steep decompression phase as well as the suction phase. (Remark: in the case present in both figures for visibility reasons the circuit process is represented in a clockwise direction.) The discontinuous conduction in figure 11 shows the necessary pressure level and a possible time window for a controlled leak recharge operation during the pressure stroke. The mean pulsator working pressure resulting in the pressure stroke (pD) is somewhat higher than the system pressure.

The discontinuous line in Figure 12 shows the necessary pressure level and a possible time window for a controlled leak recharge operation during the suction stroke. Recharging during the suction stroke is sufficient when the pressure level is slightly above the suction pressure.

Claims (18)

1. Pump device (1) with a push button as the actuating element for a main pump head (11), which is located in a supply line (15), and whose working space (18) is provided with a valve check valve (16) on the suction side, and a check valve (17) on the pressure side, where the pulsator working space (20) is connected through an oscillating line (12), loaded by means of pumping (21), to the working space (18) of the main pump head (11), so that the button sucks, the pumping means (21) oscillating, from the supply line (15) towards the space (18) of the main pump head (11) or presses from the work space (18), a ventilation valve (9) being provided to ventilate the work space (20) of the push button, characterized in that the valve Ventilation valve (9) is a time controlled valve and / or a double seat valve controlled by pressure and because a device is provided for introducing a liquid into the working space of the button and / or of the oscillating conduit (12). 2. Pump device (1) according to claim 1, characterized in that the working space (20) of the push-button is connected via the and / or an additional ventilation valve (9) to the suction side (15) of the supply line. Pump device (1) according to one of the preceding claims, characterized in that the working space (20) of the button is connected via the and / or an additional ventilation valve (9) to the pressure side ( 5) of the supply line. Pump device (1) according to one of the preceding claims, characterized in that the working space (20) of the push-button is connected via the and / or an additional ventilation valve (9) to a refill tank (30) to compensate for the leakage loss in the working space (20) of the button and / or of the oscillating conduit (12). Pump device (1) according to one of the preceding claims, characterized in that the working space (20) of the button is connected via the and / or an additional ventilation valve (9) to a collecting container ( 36) to collect and eventually return a pumping medium (21) projecting into the vent. Pump device (1) according to one of the preceding claims, characterized in that the pump device has a refill tank for refilling a pump medium, which is loaded with a pressure that essentially corresponds to the system pressure. Pump device according to one of the preceding claims, characterized in that the oscillating line is provided with a cooling element. Pump device according to one of the preceding claims, characterized in that the push button is arranged above the main pump head. Pump device (1) according to one of the preceding claims, characterized in that the oscillating line (12) is subdivided into at least two parallel sub-sections (121, 122) in at least one section. Pump device (1) according to the preceding claim, characterized in that the volume of the partial sections (121, 122) of the oscillating line (12) running in parallel or the volume of the oscillating lines (121, 122) ) running in parallel, is in each case at least the same size or preferably greater than the displacement volume of the button. Pump device (1) according to claims 9 or 10, characterized in that control valves (123, 124) are provided for opening and closing at least part of the part sections (121, 122) of the oscillating line (12) or parallel oscillating lines. Pump device (1) according to one of the preceding claims, characterized in that the main pump head has at least two check valves (16, 161), connected in parallel on the suction side. Pump device (1) according to the preceding claim, characterized in that the cross section of the pipeline housing the check valve on the suction side, downstream with respect to the flow direction during the pressure phase, is greater than the cross section of the pipe that houses the other check valve on the suction side. Pump device (1) according to one of the preceding claims, characterized in that a separating piston (32) is arranged in the oscillating line (12 '). Pump device according to one of the preceding claims, characterized in that it is configured with a double action pushbutton and two pump circuits (A, B), controlled in opposite directions. Pump device (1) according to one of the preceding claims, characterized in that the pushbutton is configured as a double-action pushbutton, one of the sides of which is configured as a drive element for the main pump head (11), and whose the other side is stressed with a pressure, which essentially corresponds to the system pressure. Pump device according to one of the preceding claims, characterized in that the pushbutton is made of a diaphragm or tubular diaphragm construction. Pump device according to one of the preceding claims 1 to 16, characterized in that the pushbutton is designed as a piston or plunger type.