WO2006071136A1

WO2006071136A1 - Method for specified mixture formation and device for carrying out said method

Info

Publication number: WO2006071136A1
Application number: PCT/RU2005/000658
Authority: WO
Inventors: Anatoly Vasilievich Medvedev
Original assignee: Doronin, Igor Viktorovich; Ovchenkova, Oksana Anatolievna
Priority date: 2004-12-27
Filing date: 2005-12-22
Publication date: 2006-07-06
Also published as: RU2271857C1

Abstract

The invention relates to mixture-forming engineering by a method for volumetrically dosing initial component specified flows. The aim of said invention is to ensure the stability of formation of a specified component proportionality or a mixture formation multiplicity in a continuous flow associated with a subsequent mixture humanisation in such a way that a proportional homogeneity independent of hydrodynamic variations at the input channels of the initial components is attained. The inventive method consists in carrying out the volumetric dosing of the specified flows of the initial components by toothed rotors of a gear-type pump mechanism by means of separate input channels, in separately forming the input flows of the initial components in the form of discrete elementary doses closed in an intertooth space, in combining said doses in a successively alternating order and in supplying said doses to an additional separator or a dispergator.

Description

Method of normalized mixture formation and device for its implementation

The present invention relates to a technique of mixture formation by the method of volumetric dosing of normalized flows of the starting components with their subsequent combination, homogenization and can be used in any industry for the preparation of liquid, gas, gas-liquid suspensions, dispersions, granular and viscous mixtures with a given ratio of the starting components. The proposed device relates to gear mixers of the discharge type.

State of the art

Existing mixing processes are carried out in two ways. The first way - volume dosing, consists in the fact that in a regulated sequence, certain volumes of components are introduced with continuous stirring and they are mixed until a homogeneous mixture is formed. The disadvantages of this method are: the error of the input volumes, the heterogeneity of the mixture and the duration of the process. The second method is combining the normalized flows of the starting components, followed by mixing during transportation. The disadvantages of this method include the effect on the homogeneity of the mixture of the error in the dosage of the starting components, the randomness of the process of mixing, the complexity of the control system for the dosage of the starting components. In addition, the implementation of any of the above methods in design differs from each other depending on the rheological properties of the starting components. All these factors do not guarantee uniformity of mixture formation, since the ratio of components at arbitrary points of the mixture is a random quantity, and for its normalization, either a long time for mixing or special devices for averaging the mixture to the required uniformity are needed.

A technical solution is known [RF patent 2181620 7B01F5 / 04, 15/04, A61M5 / 168, published on 04/27/2002 Bull. N ° 12], which describes a device and method for mixing continuously flowing liquid with one or more dosed added minor liquids. According to this method for mixing continuously flowing liquid with one or more added small doses of minor liquids, the latter are supplied under pressure into the main fluid using needle-like nozzles that are introduced through a rubber-like septum installed in the pressure pipe through which the main fluid passes. This solution has the following disadvantages: the complexity of the technical implementation of this solution consists in the design and control of the initial flows with the aim of their proportional normalization according to the mixing ratio.

The closest in technical essence and the achieved result is a method of mixing solid and liquid substances and a device for its implementation [RF patent 2079353 6B01F5 / 16, published 05/20/97 Bull. JNal4]. The design of the device allows you to provide conditions under which the ratio of solid to liquid remains constant from the moment of preliminary contact with each other until the moment of release from the device as a mixture. The pressure of the supplied fluid is regulated so that it exceeds the minimum pressure and is less than the maximum pressure of the rotating mass of liquid, the fluid flow is supplied perpendicular to its annular cross section. That is, the mixing method is based on a pressure balance. Hence, the disadvantages of this method are obvious, consisting in the need for constant regulation of the pressures and feed rates of the components into the mixing region. Such “indirect dosing)) of the initial components depends on the error of their dosing, the accuracy of flow control to ensure the desired mixing mode.

Disclosure of invention

The aim of the invention is to ensure the constant formation of a given proportionality of the components or the multiplicity of mixture formation in a continuous stream with subsequent homogenization of the mixture to proportional homogeneity regardless of fluctuations in the hydrodynamic parameters on the input lines of the original components, as well as simplifying the design of the device for implementing the proposed method. This goal is achieved in that the volumetric dosing of normalized flows of the starting components is created by gear rotors of the gear pump mechanism using separate input channels, while the input flows of the starting components are separately formed in the form of discrete elementary doses enclosed in the interdental space, and then these elementary doses are combined into sequentially alternating order and served on an additional mixer or dispersant. Moreover, by rationing is meant the ordered formation by a discrete-dispensing agent of the starting components in a predetermined proportionality into one stream, characterized by a constant proportional distribution of the components in the volume of the formed mixture before homogenization or dispersion.

To implement this method, a device is proposed that uses a gear pump as a discretely dosing means, which is equipped with separate input channels communicating with the rotor cavities of the gear pump. Important factors in the mixture formation is the discreteness of the mixture formation of the initial components in a given proportionality and its constancy in the mixing process. The term “dispersion of mixture formation)) is understood to mean a proportionally specified minimum number of components that enter into the process of mixture formation, ensuring the uniformity of the mixture supplied to homogenization or dispersion. In the proposed device that implements this method, the magnitude of the discreteness of the mixture formation is determined by the size of the interdental space and depends on the tooth module and the width of the crown, and the performance on the number of teeth and the number of revolutions. Such a solution allows for a constant dosing regardless of fluctuations in the hydrodynamic parameters of the input lines of the source components, does not require special means of flow control and eliminates the error in the dosage of the source components.

In the proposed device, additional sections can be introduced, consisting of gear pumps with separate input channels communicating with the corresponding rotor cavities of gear pumps. In this case, gear pumps must be kinematically connected among themselves, have a common drive, and their outputs are combined by a common mixer having an output channel. Separating partitions must be installed between sections.

The following device options are possible:

- mixing chambers are introduced into each section, communicating with the outputs of gear pumps and with each other by means of holes in the dividing partitions, and one of the mixing chambers is in communication with the output channel;

- spring mixers are introduced into the mixing chamber of each section;

- in each section, mixing chambers isolated from each other are introduced, communicating with the outputs of gear pumps, and additional chambers communicating with holes in the dividing partitions, while additional chambers communicate with the corresponding mixing chambers, and one of the additional chambers communicates with the output channel;

- spring mixers are introduced into additional chambers.

In the case when the proposed device is made in the form of sections separated by partitions and united by a common drive, and each mixing section is connected to each other by means of holes in the partition of the mixing chamber, one of which communicates with the output channel, we get a mixing unit with a given mixing ratio of several components. Such an aggregate is theoretically deprived of the possibility of a random process of mixture formation, since the receipt of normalized discrete initial doses for mixing is ensured constructively. In addition, this method of mixture formation does not depend on input vibrations, does not have an error, and does not require any control, a monitoring system for monitoring the constancy of dosing, and does not require feedback. If springs are installed in the mixing chambers of such an aggregate, then not only mixing but also an ultrasonic effect can be obtained in the volumes of these chambers. Developing the technical solution further, it is possible to introduce at the output of the mixing chamber in each section an additional camera, communicating with the previous camera. Equipping the additional chamber with a spring and a partition with holes for communication with similar cameras of other sections and previously isolated with a solid partition of the mixing chamber, you can get a mixing and dispersing unit to obtain, for example, technical oil in a continuous stream. A similar mixing scheme can be implemented on typical serial gear pumps. For this, it is necessary to kinematically connect them with a single drive or couplings, or transmission gears, or a combination thereof. If one component is supplied separately to each gear pump, dosing will occur, transforming into normalized flows combined in one mixer or dispersant. However, in this case, the role of the random component in the mixing process itself will increase. All of the above structures are able to work without a drive, like hydraulic motors. In this case, it is necessary to apply one of the components under pressure, and the remaining components can enter the other sections in the vacuum absorption mode, due to the kinematic connection of the pumps.

Brief Description of the Drawings

The proposed technical solution is conventionally shown in the drawings, where: in Fig. L shows a diagram of a device explaining the method of mixture formation;

- figure 2 shows a diagram of a packet-sectional device with mixing chambers;

- FIG. 3 shows a section A-A of FIG. 2;

- in FIG. 4 shows a diagram of a batch section device with mixing chambers and spring mixers;

- figure 5 shows a section B-B of figure 4;

- figure 6 shows a diagram of a device with an additional camera;

- Fig.7 shows a section C-C of Fig.6;

- on Fig shows a diagram of the implementation of the proposed method on serial gear pumps with mixing, for example, four components;

- in FIG. 9 shows a mixing scheme of two components.

An embodiment of the invention The mixing device shown in FIG. 1 consists of a housing 1, input channels 2, 3, gear rotors 4, 5 and an output channel 6. Component 1 is fed to input 1, and component 2 is fed to input 2. FIG. 2 shows sectional design of the device, where a mixing chamber 7 is introduced in each section and dividing partitions 8 are installed, containing holes 9. In this case, component 1 is fed to input 1, component 2 to input 2, component 3 to input 3, component 4 to input 4, input 5 is component 5, and input 6 is component 6 (even inputs are not shown in the drawing). In the mixing chambers 7, spring mixers 10 can be installed (FIG. 4, FIG. 5). The device may comprise an additional chamber 11 with spring mixers 10, while the holes 9 in the separating partition 8 are located in the zone of the additional chamber 11, and in the chamber zone mix 7 they are absent. Implementation of the proposed method using serial gear pumps (Fig. 8, Fig. 9) includes consumable containers 12 of the original components, gear pumps 13 kinematically connected by one drive 14, mixers 15, 16 and 17.

The proposed method is implemented as follows. Component 1 and component 2, respectively, are fed into the input channels 2 and 3 (Fig. 1), which are divided into discrete doses by rotating gear rotors 4 and 5 and fed into the tooth engagement zone, where they are extruded into the output channel 6, in which mixing occurs . Thus, the dosing and mixing of the two components in a ratio of 1: 1 occurs. Sections similar to those shown in Fig. 1 can be combined into a package of the same type sections (Fig. 2) with dividing partitions. In this case, two components enter each section, paired mixtures are squeezed out into the mixing chambers 7, of which through openings 9 into one of the mixing chambers, which is in communication with the output channel 6. The next embodiment (Fig. 4, Fig. 5) differs from the previous one, in that the components are forced through spring mixers 10, which cut the pair mixtures into jet streams and exert an acoustic effect on the mixtures passing through them. To implement a more intense mass-energy exchange (Fig.6, Fig.7) introduced additional chambers ll with spring mixers. In this case, the mixing chambers are separated by partitions, and additional chambers are interconnected by openings 9. Paired components through spring mixers are mixed by intersecting jets in mixing chambers 7, then they enter additional chambers 11 through spring mixers, then through openings 9 they communicate with one of the additional chambers, which communicates with the output channel b. A similar process can be organized using serial gear pumps, each of which performs the task of the input channels. A prerequisite for the use of gear pumps is a common drive and a kinematic connection between them. On Fig shows a four-component mixing scheme with four gear pumps, where the performance of each pump corresponds to its share of the mixture. From consumable containers 12, the initial components by gear pumps 13 are first fed to paired mixers 15 and 16 using a common drive 14, and then paired mixtures are mixed in mixer 17, forming a mixture with a given mixing ratio. The drawing of Fig.9 shows a diagram of the same components, but assembled differently. The mixture obtained from component 1 and component 2 in mixer 15 is further diluted with component 2 in component 16 in mixer 16, and then diluted again with component 2 in mixer 17, thereby increasing the content of component 2 to a predetermined ratio.

In the literature to date, the author has not found a description of the method of mixture formation by one gear pump mechanism using separate input channels.

The use of the proposed method of mixing and devices for its implementation allows you to implement a proportionally-normalized mixing with increased accuracy at lower energy and labor costs.

Claims

Claim

1. The method of normalized mixture formation, including volumetric dosing of normalized flows of the starting components, characterized in that the separated streams of components in the form of divided normalized discrete doses are formed using the gear pump mechanism, and then they are combined in a sequentially alternating order into a common output stream and fed to an additional mixing or dispersing.

2. The device normalized mixing, consisting of a housing with input channels of the source components and the output channel for the removal of the mixture, characterized in that it is equipped with a discrete metering means in the form of a gear pump mechanism, while the input channels of the components are separately communicated with the corresponding rotor cavities of the gear pump.

3. The device according to claim 2, characterized in that additional sections are introduced, consisting of gear pumps with separate input channels communicating with the corresponding rotor cavities of the gear pumps, while the gear pumps are kinematically connected to each other, have a common drive and a common mixer, between sections installed separating partitions.

4. The device according to p. 3, characterized in that mixing sections are introduced into each section, communicating with the outputs of gear pumps and with each other through openings in the separating partitions, and one of the mixing chambers is a common mixer and communicated with the output channel.

5. The device according to claim 4, characterized in that spring mixers are introduced into the mixing chamber of each section.

6. The device according to p. 3, characterized in that each section contains mixing chambers isolated from each other, communicating with the outputs of gear pumps and additional chambers dividing the partitions of which have openings, while additional chambers communicate with the corresponding chambers of mixing, one of additional chambers is a common mixer and communicated with the output channel.

7. The device according to claim 6, characterized in that spring mixers are introduced into the additional chambers.