DK154856B - DEVICE FOR REGULATING THE QUANTITY AND / OR MIXING RELATIONSHIP OF TWO GAS AND / OR CLEANING FLOWS - Google Patents

Abstract

1. A device for controlling the flow rates and/or the mixing ratio of two gases and/or liquids, at atmospheric pressure or above atmospheric pressure, consisting of a tubular body (1) with two inlet orifices (2, 3) and two inlets (4, 5) for the entry of the two fluids into said device, said inlets being arranged on any side of said tubular body, and an inner tube (6) with not less than one lateral inlet orifice (7) corresponding with one of the inlet orifices of said body and an outlet arranged axially, the inner tube (6) being designed for rotation and/or axial travel by means of an operator entering said device through the face (10) of said body, characterized in that the outside diameter of said inner tube (6) is not less than 10% smaller than the inside diameter of said body (1), and in that not less than three sealing and isolating elements (8, 11, 12), arranged in the space between said inner tube (6) and said body (1), are firmly connected with the mobile inner tube (6) so that two of said elements will simultaneously decrease or increase the unrestricted cross-sectional area of the two orifices in the body referred to hereinabove and spaced axially on any of the sides of said body, as said inner tube (6) is moved in the axial direction, and the third sealing and isolating element (11) located between said other two elements will separate the annular space at all positions of the inner tube (6) into two separate spaces, and in that the two sealing and isolating elements (8, 11) arranged on the two sides of the inlet orifice(s) (7) of the inner tube (6) are firmly connected with a tube section (13) in the area of inlet orifice (3) of the body (1) at the body wall ends of said elements (8, 11), and partly or fully close or open said inlet orifice (3) as the inner tube (6) is rotated, and in that governors of known design are incorporated in the device upstream of the two inlet orifices (2, 3) to maintain equal pressures in said two orifices and/or to maintain a pre-selected pressure difference between said two inlet orifices.

Description

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in

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a device for controlling the amount and / or mixing ratio of two gas and / or liquid streams at normal pressure or a proportionate pressure, which consists of a tubular housing with two inlet openings in the side with connecting plugs for supply. of the two components as well as an inner tube with at least one inlet side of the side, which is connected to one of the inlet openings of the housing, as well as an axial outlet opening, and the inner tube by means of a control device which is passed through the end of the housing, can be rotated in the housing and / or is movable in the axial direction.

In many, especially technical processes of various kinds, single components in certain proportions are necessary. This applies to all kinds of drugs. In the case of gaseous and / or liquid components, which, for example, are to be supplied to consumables or further processing plants, the amount and / or mixing ratio today is largely effected by the incorporation of 20 flow regulators - mainly valves - which are located in the supply lines of the individual components and connected to each other in such a way that, by changing one flow of quantities, the other quantity (s) of flow (s) are also automatically changed accordingly. Thus, in this kind of control, the interrelationship of the components is kept constant regardless of the amount of mixture needed. However, for the known devices, the accuracy of the regulation and the range of control leave mostly much to be desired.

In many cases, it is necessary to change the proportions of the components and, in addition, to vary the mixing volume.

For this purpose, from German patent specification No. 652 764, a device consisting of a tubular housing having 2

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inlet openings for the components, a nozzle body disposed in the housing with corresponding openings and a piston disposed in the nozzle body. The nozzle body and piston are disposed longitudinally independently of each other in the housing and the nozzle body, respectively. In addition, the nozzle body can be rotated together with the piston. In the longitudinal and pivotal movement, the free flow cross-section of the components is changed, and precisely by the longitudinal displacement of the nozzle body and the piston the mixing ratio is regulated, and by the simultaneous rotation of the two movable members, the total flow and the flow of quantities of the two components are respectively controlled. Thus, in order to change the proportions of the components, two parts must be displaced independently of one another in relation to the outer housing. Since the housing and nozzle body, nozzle body and piston respectively are in metallic contact, the frictional forces to be overcome are extremely large. Furthermore, neither the density nor the mobility is ensured if gases or liquids are passed through at a temperature which differs from that of the surroundings.

Since the mixing ratio is also dependent on the flow rates of the components, the ratio is changed inadvertently by changing the flow rate. Consequently, constancy in the quantity ratio cannot be assured in these circumstances by the use of known devices.

It is an object of the invention to provide a device for quantity and ratio control, in which the quantity ratios of the components can be kept constant in alternating flows, and which furthermore allows the components of the components to be changed, e.g.

30, depending on properties or flow rates, and where all control measures, regardless of the effect of temperature, can be re-implemented with great accuracy in simplest manner and using a 3

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of forces for regulation.

This task is solved according to the invention by the features mentioned in the characterizing part of claim 1. The object of the invention differs, inter alia, from the known device in that there is only one movable part in the housing - the inner tube and that its outside diameter is considerably smaller than the inside diameter of the housing, thus creating a circular annular space. wherein and through one of the components flows. A mixture of the components of the circular annular space is prevented by at least one of the sealing and locking elements connected to the inner tube. Adjustment or control of the component flow rate, respectively, is effected by the device according to the invention 15 by moving the inner tube in the axis direction; adjusting or adjusting the mixing ratio, respectively, is done by rotating the inner tube, whereby one of the inlet openings of the housing can be partially or completely closed by means of the pipe piece attached to the inner tube and two sealing and closing elements respectively. Since only the sealing and locking elements, which are equipped with plastic slides known in themselves, are in contact with the housing, the control forces.e are very small. Temperature effects do not affect the movement or density of the device 25. By applying differential or equal pressure regulators known per se to the inlet openings of the housing, the flow rate of the components and thus the volume ratio is kept constant.

Depending on the field of application, the components, after adjusting the amount ratio and / or the flow rates, can be fed either mixed or separated to the consumption site, for example a fireplace. Separate supply is often needed in explosion-protected applications.

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4

According to claim 4, the two components are then routed out of the housing through two coaxial connection lines. While the outer conduit is connected to the housing, the inner conduit of the second component is connected to the inner tube via a flexible conduit connection, e.g., with a bellows, to prevent the longitudinal and pivotal movement of the inner tube from being transmitted to the housing. the continuing lead.

A further development according to the invention of the new device according to claims 5 and 6 makes it possible to produce a homogeneous mixture of the components supplied in controlled quantities.

It is known that the mixing of two components which, through a central tube and a cylindrical tube surrounding it, is fed to a further tube of the same diameter as the cylindrical tube, occurs only after relatively long flow paths. Therefore, countless dynamic and static mixing devices have already been developed.

The advantage of the device parts according to the invention is above all that they can be integrated as components of the control device in the housing of this device, i.e. that with only one structural part both control of the mixture quantities can be achieved and the production of a homogeneous mixture of the components.

The device according to the invention is described in more detail below with reference to the exemplary embodiments shown in the drawing, in which fig. 1 shows a longitudinal section of the mixing control device; FIG. 2 section A-A and 5

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FIG. 3 shows the section B-B in FIG. 1

The mixing control device consists of a housing 1 with the inlet openings 2, 3 for the mixing components supplied through the connecting studs 4, 5. In the housing 15, the inner tube 6 is provided with inlet openings 7, which are connected to the inlet opening 3 of the housing, for the mixing components supplied through the connecting rod 5.

The inner tube 6 is firmly connected to the disc-shaped sealing and closing element 8, which in turn is connected via the axis 9 to the drive not shown for movement of the inner tube. The shaft 9 is, in a known manner, air-tight through the end wall of the housing 10. The two annular sealing and closing elements 11, 12 are fixedly connected to the inner tube. The distance between the two entrance openings 2, 3 of the housing and the distance between the sealing and closing elements 8, 11, 12 is dimensioned such that all the sealing and closing elements are outside the area of the housing entrance openings at full "open" path 11, ie. at maximum flow rate - as shown in the drawing (with fully drawn lines). After axial displacement of the inner tube, i.e. at reduced flow rate, the sealing and closing elements 8 and 12 are located within the inlet openings 2, 3 of the housing, while the element 11, respectively, blocks and seals the circular space between the inlet openings 2 and 3 of the container.

It can be seen that the size of the inlet openings of the housing is reduced only by the width of the elements 8, 12 - or 30 less - by axial displacement of the inner tube, but that the free flow cross-section of the supplied media is reduced according to the axial displacement.

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6, since the mixing components behind the elements 8, 12 cannot flow through the circular annular space or the inner tube, i. E. that the flow rate of the mixing components is regulated and 5 respectively adjusted by the axial movement of the inner tube.

For adjusting the mixing ratio of the components supplied through the connection pins 4, 5, the pipe piece 3 serves as fixedly connected to the sealing and closing elements 8 and 11 and internally against the wall of the housing. FIG. 2 shows the pipe piece 2 in a position where it partially closes the opening 3. The opening of the pipe piece 13 has the same size and shape as the inlet opening of the housing 3. By rotating the inner pipe, the entrance opening 3 of the housing 15 can be closed completely or partially by the pipe piece, ie. that the amount of the mixing components supplied through the connector 5 can be changed independently of the amount of component supplied through the connector 4. Since through the pipe piece 13 and the sealing and closing elements 8 and 11 there is a fixed connection between the inner pipe 6 and the axis 9 of the drive, unlike the one shown in FIG. 1 - omit the part of the inner tube which is between the sealing and closing elements 8 and 11, ie. the entrance opening of the inner 25 pipe can be constituted by the inner pipe piece which is surrounded by the sealing and closing element 11. Furthermore, for a more secure seal between the pipe piece 13 and the inner wall of the housing on the outside of the pipe piece, one or more 30 (not shown in the drawing) sealing strips in the axial direction of the housing.

In practice, the entrance openings 2, 3 of the housing can be of any shape, e.g., round, square, square 7

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or trapezoid, where the narrowest area of axial displacement of the inner tube is ultimately reduced and confined, which has the advantage that, with small flow rates, a particularly accurate regulation is obtained since a given axial displacement causes a relatively minor change of the amount than in the large (base) region of the trapezoidal opening. However, when using trapezoidal inlet openings 2, 3 in the housing, it must be ensured that the free flow cross sections for different quantities of flow in all cases, ie. also at different proportions, are similar. This can be achieved either by a corresponding trapezoidal shape of the opening in the pipe piece 13 or by using a known functional drive device to achieve the rotational movement of the inner pipe 15 - and thus the pipe piece. Various known devices can be used as regulators for the inner tube, for example, the turning movement can be triggered by an (electrically driven) sprocket attached to a sprocket on the axis 9.

The axial movement of the inner tube may e.g.

20 is actuated by a pneumatic or hydraulically acting device, conveniently interconnected by a rotary clutch, to prevent the rotary movement from acting back on the axial movement. The choice of start-up devices can be adapted within wide limits according to the given circumstances at the mounting location and the available energy.

In order to ensure a rapid, homogeneous mixing of the components supplied through the two connecting studs 4, 5, respectively, the circular annular space and the inner tube of the mixing regulator, a baffle is disposed in the housing at a small distance from the inner tube 6 opening. plate 14, which is connected to the inner tube through, for example, three spacers 15. The distance of the plate 14 from the outlet opening of the inner tube, respectively.

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The length of the spacers is dependent on the diameter of the inner tube or the amount of component supplied through the inner tube, which is to be passed around the baffle plate and against the wall of the housing and into the component flowing from the circular space. Since these measures do not in all operating conditions, ie. In particular, when a small amount of component is passed through the inner tube, a homogeneous mixture of the two components is ensured, according to the invention 10, in the flow direction of the mixture, behind the baffle plate, another mixing device is arranged. As can be seen in Figs. 1 and 3, it consists of blending elements 16, 17 and 18 positioned behind and offset relative to one another in the housing as a star, each element being comprised of three flow guide plates 19, which has a growing width from the midpoint, the axis of the house to the edge, respectively.

Each of these flow guides is curved in the middle along its longitudinal axis, radially to the axis of the container, respectively.

In the illustrated embodiment, the symmetrically arranged flow guide plates for each mixing element cover a total of one quarter of the cross section of the housing. The top of the vault may be rounded or sharp-edged. The two mixing elements are integrated behind each other in such a way that the longitudinal axes of the second flow guide plates are rotated by 60 ° with respect to the flow guide plate of the first mixture element, ie. lies in the center of the free passage cross-section of the first mixture element. By using three mixing elements, it has proved advantageous to maintain this angular displacement so that the third 30 mixer current guide plates are in the same position as the first. The appropriate or required number of mixing elements, respectively, depends on the physical properties, such as density and toughness, of the media to be mixed. For mixing gases, eg air 35 and fuel gas, the design has three mixing elements

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9 is found to be sufficient to achieve a completely homogeneous mixture of the components. The above described mixing control device according to the invention can in principle be arranged in any way. However, it has been found in practice that a vertical position is particularly suitable for the following reasons: The parts of the sealing and locking elements 8, 11 and 12, which lie against the wall of the housing, are then only subject to minimal wear, since, unlike a horizontal placement, weight-related irregular forces do not act upon it. In addition, in a downward flow, storage of media contained in the media, especially solid - cannot be accumulated by mixing gases with liquid impurities in the inner tube or in the circular ring-shaped space in the device.

Finally, the mixing control device according to the invention can also - by correspondingly select the distance between the sealing and closing means II and 12 relative to the mixing input opening 2 - fulfill the function of a blocking means, which is achieved, on the one hand, by the sealing and closing means 12. is closed (by axial displacement of the inner tube) to a position with the flow relative to the inlet opening 2 of the housing, and on the other hand (in the case of rotation of the inner tube) the inlet opening 3 of the housing is closed by the tube piece 13.

Finally, as an example, mention should be made of the use of the new mixing regulator for generating gas at peak loads in the public gas supply. In order to meet the peak load that is particularly prevalent in the winter of 30, the usually distributed natural gas is often added to a mixture of air and liquid gas whose calorific value and the Wobbe index must be adapted to the natural gas.

Since the conventional liquid gas, which is mainly

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10 of propane and butane, may contain these principal components in alternating quantities and, in special cases, almost exclusively consisting of one of these components, the proportions of air and liquid gas must accordingly. is adapted to the liquid gas used at all times. Moreover, the amount of mixture produced must of course be adjusted to the need. In order to produce a mixture suitable for the public gas supply with a van's value of 12.31 kWh / m, the mixture ratio of air at, for example, a liquid gas mixture of 95% propane and 5% butane 1: 1.32 . If a liquid gas mixture of 10% propane and 90% butane is used, the air to air mixture ratio is 1: 1.95. Such mixing ratios are most easily regulated by means of the new mixing regulator with an accuracy of less than 1%. At the same time, the mixing amount between the maximum or nominal output and approx. 10% of this value is also simply and accurately regulated.

Claims (6)

Device for controlling the amount and / or mixing ratio of two gas and / or liquid streams at normal pressure or a proportionally elevated pressure, said device consisting of a tubular housing (1) with two inlet openings (2.3 ) in the side with connecting plugs (4,5) for supplying the two components as well as an inner tube (6) with at least one inlet opening (7) in the side, which is connected to one of the housing inlets, and an axial outlet opening, and wherein the inner tube (6) 10 can be rotated in the housing and / or movable in the axis direction by means of a control device (9) which is passed through the end (10) of the housing, characterized in that the outer tube (6) is external diameter is at least 10¾ smaller than the inside diameter of the housing (1), that between the inner tube (6) and the housing (1) there are three sealing and locking elements (8, 11, 12) firmly connected to the movable inner pipe (6) in such a way that two of these elements move by the insert axial tubing terminates uniformly diminishes or enlarges the free flow cross-sections of both housing inlet openings (2,3), and the three sealing and interlocking elements (11) located between these two position the inner tube (2) to divide the circular space into two, the sealing and locking elements (8, 11) located on both sides of the inner opening of the inner tube 25 on the side which face the inner wall of the housing are firmly connected to a pipe piece (13) located within for the area of the housing entrance opening (3) and when rotating the inner tube (6), the opening partially or completely closes or opens and that on the housing entrance openings are known per se differential and / or direct pressure regulators. DK 154856 B 12 Device according to claim 1, characterized in that the inner tube (6) within the area of the housing entrance opening (3) has several inlet openings evenly distributed on the periphery of the inner tube, whose total free passage cross-section is at least as large as the largest free cross-section of the entrance opening of the housing (3). Device according to claim 1 or 2, characterized in that the sealing and closing element, 10 which, when moving the inner tube in the axial direction, reduces or enlarges the free flow cross-section of the inlet opening of the housing which communicates with the entrance opening (s) of the inner tube. , is disc-shaped and on one side is fixedly connected to the inner tube 15 (6) and on the other hand to the regulator for the inner tube. Device according to one of claims 1 to 3, characterized in that the inner tube (6) is connected via a flexible pipe connection piece to a connection line which is coaxially passed in a conduit connecting to the housing (1). Device according to one of claims 1-3, characterized in that the inner tube in the flow direction ends behind the entrance opening (2) of the housing and that behind the axial outlet opening of the inner tube a baffle plate (14) is provided which guides it from the internal pipe flowing component stream in radial direction towards the wall of the housing. Device according to one of claims 1-4, characterized in that in the housing (1) behind the inner tube 30 (6) the axial exit opening, preferably behind the baffle plate (14), is at least two behind one another and vertically relative to DK. The planes of the housing axis displaced relative to each other in the direction of flow of the mixture are arranged three center vaulted flow elements (18), the width of which increases from the center to the edge.