阅读说明：本技术 流体移动装置 (Fluid moving device ) 是由 M·雷哈德 于 2018-06-14 设计创作，主要内容包括：本发明涉及一种用于移动流体的装置,包括：计量头,在该计量头中布置有计量腔室；以及可在第一位置和第二位置之间移动的位移元件,其中,该位移元件邻接计量腔室,并且在第一位置中的计量腔室的容积不同于在第二位置中的计量腔室的容积,其中,设有用于将位移元件从第一位置移动到第二位置的驱动单元和用于将位移元件从第二位置移动到第一位置的返回机构。根据本发明,为了确保该装置具有紧凑的设计并允许计量头和位移元件可靠地工作,返回机构具有两个部件,每个部件都是磁体或由铁磁材料制成的元件,第一部件放置在计量头上,第二部件连接到位移元件,并且这两个部件设计成使得作用在这两个部件之间的磁力会引起在第一位置的方向上施加到该位移元件的力。(The invention relates to a device for moving a fluid, comprising: a metering head having a metering chamber disposed therein; and a displacement element movable between a first position and a second position, wherein the displacement element abuts the metering chamber and the volume of the metering chamber in the first position is different from the volume of the metering chamber in the second position, wherein a drive unit for moving the displacement element from the first position to the second position and a return mechanism for moving the displacement element from the second position to the first position are provided. According to the invention, in order to ensure a compact design of the device and to allow a reliable operation of the metering head and the displacement element, the return mechanism has two parts, each of which is a magnet or an element made of ferromagnetic material, the first part being placed on the metering head and the second part being connected to the displacement element, and the two parts being designed such that a magnetic force acting between the two parts causes a force to be applied to the displacement element in the direction of the first position.)

1. Device for moving a fluid, having a metering head (2) in which a metering chamber (3) is provided, and a displacement element which is reciprocally movable between a first position and a second position, wherein the displacement element defines the metering chamber (3) and the volume of the metering chamber (3) in the first position of the displacement element is different from the volume of the metering chamber (3) in the second position, wherein a drive unit is provided for moving the displacement element from the first position to the second position, and a return mechanism is provided for moving the displacement element away from the second position to the first position, characterized in that the return mechanism comprises two parts (9, 10), wherein each part is a magnet or an element made of ferromagnetic material, wherein a first part (9) is provided on the metering head (2), a second part (10) is connected to the displacement element, and the two parts (9, 10) are configured such that a magnetic force acting between the two parts (9, 10) exerts a force on the displacement element in the direction of the first position.

2. An arrangement according to claim 1, characterized in that the two parts (9, 10) of the return mechanism are constructed and arranged such that magnetic repulsion forces act between them.

3. Device according to claim 1, characterized in that the two parts (9, 10) of the return mechanism are constructed and arranged so that a magnetic attraction is exerted between them.

4. Device according to one of claims 1 to 3, characterized in that a recess (11) is provided in the wall of the metering chamber (3), in which recess (11) a part (9) of the return mechanism provided on the metering head (2) is positioned, wherein preferably also a part (10) of the return mechanism provided on the displacement element is at least partially positioned in the recess (11).

5. Device according to one of claims 1 to 4, characterized in that the return mechanism comprises a third component (12), the third component (12) being a magnet or an element formed of ferromagnetic material, wherein the third component (12) is connected to the metering head (2) and the three components (9, 10, 12) of the return mechanism are constructed and arranged such that a magnetic attraction force acts between the third component (12) and the second component (10) of the return mechanism.

6. Device according to one of the preceding claims, characterized in that the drive unit is a hydraulic drive unit.

7. The device of one of claims 1 to 6, wherein the displacement element is a diaphragm.

8. Device according to one of claims 1 to 7, characterized in that the magnet is a permanent magnet.

9. The device according to one of claims 1 to 8, characterized in that the volume of the metering chamber (3) is smaller in the second position than in the first position.

10. Device according to claim 9, characterized in that the metering head (2) comprises a head cover (15), a fluid outlet (19) and a drive unit block (17), in which head cover (15) a metering chamber (3) is provided, from which metering chamber (3) fluid can leave the metering head (2) via the fluid outlet (19), wherein preferably the first part (9) of the return mechanism is provided in the head cover (15).

Technical Field

The invention relates to a device for moving a fluid, having a metering head in which a metering chamber is arranged, and having a displacement element which can be moved back and forth between a first position and a second position, wherein the displacement element delimits the metering chamber and the volume of the metering chamber of the displacement element in the first position differs from the volume of the metering chamber in the second position, wherein a drive unit for moving the displacement element from the first position into the second position is provided, and wherein a return mechanism for moving the displacement element out of the second position into the first position is provided.

Background

Devices of this type are known and are used, for example, as metering pumps. They are commonly used for metering chemicals. In particular, these applications include applications such as the treatment of drinking water with disinfectants, the metering of corrosion inhibitors and disinfectants in cooling circuits, the metering of flocculants in waste water treatment, the metering of additives in the paper industry and the metering of additives in the production of synthetic materials.

The metering chamber of this type of pump comprises a fluid outlet through which fluid located in the metering chamber can be pushed out. This occurs because of the volume change in the metering chamber caused by the displacement element, which is controlled by the drive unit. The fluid is forced out due to the reduction in volume in the metering chamber. Typically, the metering chamber will additionally have a fluid inlet through which fluid may be drawn into the metering chamber. The fluid may be delivered by alternating the volume of the metering chamber, wherein with increasing volume the fluid is drawn into the metering chamber via the fluid inlet and with decreasing volume the fluid is forced out of the metering chamber via the fluid outlet.

To prevent accidental reverse flow of fluid, a properly arranged one-way valve is used.

Alternatively, the described fluid moving device may also be used as a pulsator (pulser). The pulsator may, for example, drive the extraction column.

In contrast to the metering pump, the pulsator has no fluid inlet (or the fluid inlet is closed). Here too, the volume of the metering chamber is cyclically alternately increased and decreased, so that the pressure of the fluid is also cyclically changed. In this regard, in contrast to pumps, no fluid is transferred from the fluid inlet to the fluid outlet. Instead of this, a periodically varying pressure is generated in the working line connected to the fluid outlet.

The drive unit for moving the displacement element of this type of device may be a hydraulic drive unit. A device of this type is known, for example, from DE 102014010108B 4. Wherein a displacement element configured as a diaphragm delimits the metering chamber from the hydraulic chamber. This moves the displacement element from the first position to the second position if the pressure of the hydraulic fluid in the hydraulic chamber increases, and the negative pressure generated by the hydraulic pressure additionally supports the return of the displacement element from the second position to the first position. In addition, recovery is usually accomplished by means of a spring force. When using a spring force to restore the displacement element, the displacement element must comprise a guide for the spring.

The restoring of the displacement elements, which is supported by means of a hydraulically generated underpressure, must take a great deal of effort to generate a continuous underpressure and limits the generation of underpressure, since the hydraulic oil can be degassed, while the restoring by means of elastic forces takes up a large space in order to accommodate the building elements necessary for the restoring. The result of the large amount of space required is a higher cost of the displacement element and its guide.

Disclosure of Invention

It is therefore an object of the present invention to provide a device which overcomes the above-mentioned disadvantages. In particular, it is an object of the invention to provide a device which is compact in design and reliable in operation.

At least one of these objects is achieved by means of a device of the above-mentioned type, wherein the return mechanism comprises two parts, wherein each part is a magnet or an element made of ferromagnetic material, wherein a first part is arranged on the metering head and a second part is connected to the displacement element, and wherein the two parts are configured such that a magnetic force acting between the two parts exerts a force on the displacement element in the direction of the first position.

The basic idea of the invention is the magnetic operation of the return mechanism. Thus, in addition, at least one of the two components must be configured as a permanent magnet or an electromagnet.

By using a component made of a magnet or ferromagnetic material in the return mechanism, no additional guide is required for the displacement element.

In this respect, these elements may be applied to the parts of the return mechanism or in front of these parts, which parts have a damping effect, when these parts are pressed against each other and/or may serve as spacers between the parts of the return mechanism.

In one embodiment of the invention, the two parts of the return mechanism are constructed and arranged such that a magnetic repulsion force is exerted between them.

In order to generate magnetic repulsion forces, the two components must be magnetized or magnetizable such that the same magnetic poles face each other. Thus, each component may comprise a permanent magnet or an electromagnet.

The first part of the return mechanism may be fixedly attached to the metering head at a position such that a second part of the return mechanism connected to the displacement element repels the first part, thereby moving the displacement element in the direction of the first position.

Therefore, the closer the displacement element is to the second position, the greater the magnetic restoring force.

As an example, the material of the permanent magnet may be an alloy formed of neodymium, iron, and boron. This type of permanent magnet may be in the form of a disc and have a minimum repulsion force of about 150N with a 1mm stroke.

In another embodiment of the invention, the two parts of the return mechanism are constructed and arranged so that a magnetic attraction is applied between them.

In order to generate the magnetic attraction force, the two parts must be arranged so that different magnetic poles face each other. This can be achieved, for example, by means of two suitably arranged permanent magnets or electromagnets. However, as an alternative, one of the two parts of the return mechanism may comprise a ferromagnetic element, so that it is magnetized and attracted by the other part. In this case, the closer the displacement element is to the first position, the greater the magnetic restoring force.

In a further preferred embodiment, a recess is provided in the wall of the metering chamber in which a part of the return mechanism provided on the metering head is positioned, wherein preferably also a part of the return mechanism provided on the displacement element is at least partially positioned in the recess.

As an example, the metering chamber may comprise a recess having dimensions corresponding to those of the first member such that the first member lies flush in the recess. Alternatively, the recess can also be configured such that the second part of the return mechanism provided on the displacement element is at least partially positioned in the recess.

The recess may additionally serve as a guide for the second part of the return mechanism.

When the two components of the return mechanism are configured such that there is a repulsive force acting between each other, the first component does not have to be attached to the metering head, because the repulsive force of the second component forces it into the recess.

In another preferred embodiment of the invention, the return mechanism comprises a third component which is a magnet or an element formed from a ferromagnetic material, wherein the third component is connected to the metering head and the three components of the return mechanism are constructed and arranged such that a magnetic attraction force acts between the third component and the second component of the return mechanism.

In this case, the first and third parts of the return mechanism are arranged on opposite sides of the displacement element such that the first part exerts a repulsive force on the second part and thus on the displacement element, and the third part exerts an attractive force on the second part and thus on the displacement element. This embodiment has in particular the advantage that the strong dependence of the magnitude of the magnetic force on the distance between the attracting or repelling poles is significantly reduced, but at the same time the other of the two forces becomes larger, because in practice one of the two forces is greatly reduced upon the movement of the displacement element, i.e. the attraction force between the third component and the second component or the repulsion force between the first component and the second component.

In another embodiment of the invention, the drive unit is a hydraulic drive unit.

The hydraulic drive unit may for example comprise a displacement piston which performs an alternating movement and in this way periodically pressurizes the hydraulic fluid. The hydraulic fluid then periodically transmits a force to the displacement element, whereby the displacement element also performs a periodic movement in the direction of the actuation force. In this way, the volume of the metering chamber increases and decreases. With the return mechanism according to the invention, a pressure reduction in the hydraulic system causes the displacement element to move quickly back into the first position.

In another embodiment of the invention, the displacement element is a diaphragm.

As an example, a short stroke diaphragm may be used as the displacement element. Short stroke diaphragms are characterized by the fact that the distance between the first and second positions is much smaller, typically at least 95% smaller than the nominal diameter. In this respect, the nominal diameter is the maximum diameter of the movable part of the diaphragm. Short stroke diaphragms are used for example in odorizing pumps. They are usually made of metal. For an odorizing pump, the typical dimensionless ratio of nominal diameter to theoretical diaphragm offset is 69.

Alternatively, a long stroke diaphragm may be employed. Typical materials for use as long-stroke diaphragms are suitable synthetic materials, such as, for example, PTFE or rubber. In another embodiment of the device according to the invention, the magnet is a permanent magnet.

Depending on the field of application, different geometries are conceivable, such as disk magnets, ring magnets, cone magnets, bar magnets, cube magnets, block-shaped magnets or spherical magnets.

In particular in case the displacement element has to perform a relatively large movement between the first and the second position, an embodiment with a three-part return mechanism may be employed due to the large variation in the magnitude of the magnetic force associated therewith during the movement of the displacement element. As an example, three identically constructed disc magnets may be employed, wherein a first magnet (as a first component) is fastened to the surface of the metering chamber, a second magnet (as a second component) is fixedly attached to the diaphragm as a displacement element, and a third magnet (as a third component) is inserted into the hydraulic block.

In this case, the second magnet may also be integrated into the diaphragm; in this case, in particular, when the diaphragm includes several layers, the magnet may be simply disposed between the respective layers.

In another embodiment of the device according to the invention, the volume of the metering chamber is smaller in the second position than in the first position.

In a further embodiment of the device according to the invention, the metering head comprises a head cover in which the metering chamber is arranged, a fluid outlet via which fluid from the metering chamber can leave the metering head, and the drive unit block, wherein the first component is preferably arranged in the head cover.

Typically, one-way valves are provided at both the fluid inlet and the fluid outlet.

Drawings

Other advantages, features and applications of the present invention may become apparent from the following description of embodiments and the associated drawings.

Figure 1 shows a schematic cross-sectional view of an embodiment with a short stroke diaphragm according to the present invention, where the magnetic force of the return mechanism acts repulsively.

Figure 2 shows a schematic cross-sectional view of an embodiment with a short stroke diaphragm according to the present invention, where the magnetic force of the return mechanism acts attractively.

Figure 3 shows a schematic cross-sectional view of an embodiment with a long stroke diaphragm according to the present invention, where the return mechanism is constructed in three parts.

Detailed Description

Fig. 1 is a schematic cross-sectional view of a metering head 2 having a short stroke diaphragm 4.

The metering head 2 is constructed in two parts and includes a head cover 15 and a driving unit block 17. A hydraulic channel 13 is arranged in the drive unit block 17, which hydraulic channel 13 is connected to a hydraulic drive unit (not shown). Furthermore, a metering chamber 3 is located in the metering head 2, in which a displacement element configured as a diaphragm 4 is located. The diaphragm 4 is sandwiched between the head cover 15 and the driving unit block 17. The cavity provided between the head cover 15 and the drive unit block 17 is divided by the diaphragm 4 into the metering chamber 3 and the hydraulic chamber 5. By means of the hydraulic drive unit, an alternating pressure can be applied to the hydraulic chamber 5.

The metering chamber 3 is connected to the fluid outlet 19 via a pressure side check valve 21 and to the fluid inlet 20 via a suction side check valve 22.

If an alternating pressure is applied to the hydraulic chamber 5 by means of the hydraulic drive unit, this results in a reciprocating movement of the diaphragm 4, as a result of which the volume of the metering chamber 3 alternately increases and decreases. If the pressure in the hydraulic chamber 5 rises, the diaphragm 4 in fig. 1 moves to the left and the volume in the metering chamber 3 decreases, as a result of which the pressure in the metering chamber 3 rises. As soon as the pressure in the metering chamber 3 is greater than the fluid pressure in the pressure line connected to the fluid outlet 19, the pressure side check valve 21 opens and fluid is forced out of the metering chamber 3 via the fluid outlet 19.

When the pressure in the hydraulic chamber 5 decreases, the pressure in the metering chamber 3 will drop and the diaphragm 4 will move to the right in fig. 1. The pressure side check valve 21 is then closed. As soon as the pressure in the metering chamber 3 is lower than the pressure in the suction line connected to the fluid inlet 20, the suction side check valve 22 opens and draws the metering fluid into the metering chamber 3 via the fluid inlet 20. This process is then repeated continuously.

This embodiment comprises a return mechanism comprising a first part 9 and a second part 10. In the embodiment shown, the first part 9 and the second part 10 are each configured as permanent magnets, which are arranged such that the same poles face each other, so that the second part 10 is repelled by the first part 9.

The head cover 15 has a recess 11, and the first member 9 is disposed in the recess 11. The second part 10 is connected to the diaphragm 4 and is also partly arranged in the recess 11. The recess 11 here also serves as a guide for the second component 10.

In fact, the pressure provided by the hydraulic drive unit is increased in this embodiment, since now an additional force has to be applied to the diaphragm 4 acting as a resistance against the magnetic repulsion between the first part 9 and the second part 10, whereas the return movement of the diaphragm 4, i.e. assuming a support for the diaphragm 4 to move to the right, is accelerated by the magnetic force between the first part 9 and the second part 10.

Fig. 2 shows a schematic cross-sectional view of a second embodiment of the device according to the invention. Wherever possible, the same reference numerals as those already used in fig. 1 are used.

Similar to fig. 1, fig. 2 shows a metering head 2, which metering head 2 is constructed in two parts and which consists of a head cap 15 and a drive unit block 17. The drive unit block 17 comprises adjacent hydraulic channels 13, which hydraulic channels 13 are connected to a hydraulic drive unit (not shown). In addition, a metering chamber 3 is provided in the metering head 2; the diaphragm 4 is located in the metering chamber and is sandwiched between the head cover 15 and the drive unit block 17. Adjacent to the diaphragm 4 and opposite the cavity is a second cavity, which is configured as a metering chamber 3, which corresponds to a hydraulic chamber 5. In addition to these elements, the head cover 2 also comprises a pressure side check valve 21 and a suction side check valve 22, the pressure side check valve 21 connected to the fluid outlet 19 being adjacent to and in fluid communication with the metering chamber 3, the suction side check valve 22 being connected to the fluid inlet 20.

In contrast to the embodiment in fig. 1, in this case the first part 9 is not provided in the head cap 15, but in the recess 11 in the drive unit block 17.

Furthermore, the two components configured as magnets are in this case arranged with different poles facing each other, so that the two components 9, 10 attract each other. In this case, the magnet of the second component 10 is integrated into the diaphragm 4.

The function substantially corresponds to that of the embodiment shown in fig. 1. In this case, however, the hydraulic drive unit must, in addition, overcome the attractive force between the first part 9 and the second part 10. If the pressure in the hydraulic chamber 5 decreases, the attractive force between the first and second parts will ensure a reliable and quick return of the diaphragm 4 to the first (right-hand) position.

Fig. 3 shows a schematic cross-sectional view of a metering head 2 configured in two parts, the metering head 2 comprising a head cover 15 and a drive unit block 17. The metering head 2 has a metering chamber 2 disposed therein, the metering chamber 2 being connected to the fluid outlet 19 via a pressure side check valve 21 and to the fluid inlet 20 via a suction side check valve 22. The hydraulic chamber 5 is adjacent to the metering chamber but is interrupted by a diaphragm sandwiched between the drive unit block 17 and the head cover 15, wherein the hydraulic chamber 5 is connected to a hydraulic drive unit (not shown) via a hydraulic channel 13.

In this case the diaphragm used is a long stroke diaphragm 6, by means of which a larger amount of fluid can be delivered than a short stroke diaphragm, due to the long stroke, i.e. the larger distance between the first (right) and second (left) positions of the diaphragm. Since the magnetic force used according to the invention depends to a large extent on the spacing between the parts of the return mechanism, the use of the embodiment shown in fig. 1 and 2 is only limited, since the additional magnetic force desired according to the invention is only very weak if the spacing is too large.

Thus, in the embodiment shown in fig. 3, the return mechanism is provided with three parts, wherein the three parts are arranged such that the first part 9 of the return mechanism is supported in the recess 11 in the head 15, the second part 10 of the return mechanism is connected to the diaphragm 6 and the third part 12 is connected to the drive unit block 17. In this example, the three components of the return mechanism comprise three permanent magnet sets, preferably three identical disc magnets.

These magnets are constructed and arranged so that magnetic repulsion forces prevail between the first part 9 and the second part 10 of the return mechanism, whereas attraction forces prevail between the second part 10 and the third part 12.

Basically, the third embodiment is a combination of the first and second embodiments.

If the pressure in the hydraulic chamber 5 is increased by means of the hydraulic drive unit, the diaphragm 6 is moved to the left against the magnetic attraction between the second part 10 and the third part 12 and against the magnetic repulsion between the first part 9 and the second part 10.

If the hydraulic drive unit no longer applies any force, the superposition of the magnetic repulsion and magnetic attraction of the magnets will cause the diaphragm to return from the second position to the first position.

With the help of the superposition of the magnetic forces, a larger magnetic force is obtained by using the third part of the return mechanism, as a result of which, with this embodiment of the device according to the invention, a longer stroke length is possible as is required in pumps using a long stroke diaphragm 6.

List of reference numerals

2 measuring head

3 metering chamber

4 short stroke diaphragm

5 Hydraulic Chamber

6 long stroke diaphragm

9 first part of the return mechanism

10 second part of the return mechanism

11 recess

Third part of 12-way return mechanism

13 Hydraulic channel

15 head cover

17 drive unit block

19 fluid outlet

20 fluid inlet

21 pressure side check valve

22 suction side check valve