RU137877U1 - EJECTION TYPE FOAM GENERATOR - Google Patents

Abstract

1. An ejection-type foam generator containing a flange, an ejector, a mixing chamber located along the axis, a diffuser and an air duct located in a plane perpendicular to the axis of the foam generator, characterized in that the flange is equipped with two nozzles connecting the foam generator mixing chamber with an automated regulator for supplying foam components, an ejector made in the form of dies installed in a flange rigidly connected to the mixing chamber, which consists of two interconnected sections, the first of which aspolozhenny inlet foamer has a greater diameter, the second portion forming the ripening chamber is rigidly connected to the diffuser and has a length of at least 10 m, and the duct is located at the beginning smeshivaniya.2 chamber. The ejection-type foam generator according to claim 1, characterized in that the diameter of the mixing chamber D is (1.2-1.4) · d, where d is the diameter of the ripening chamber, the automated controller for feeding the foaming components consists of two identical components supply units, each of which contains a tank with components for foaming in the liquid phase, a pump for supplying components to the mixing chamber, a ball valve to control the flow of components and two pressure transducers, while air is supplied to the mixing chamber using a compress ora, and air flow control is carried out using a third ball valve, equipped with feedback from two other pressure transducers.

Description

The proposed utility model relates to fire fighting equipment, designed to produce carbide-formaldehyde polystyrene (CFP), equipped with an automated regulator for feeding components, and can be used in systems for extinguishing fires in tanks with flammable liquids.

Known installation for self-curing polymer composition [see RF patent No. 2159648, IPC 7 A62C 5/00, decl. 04/23/1999, publ. 11/27/2000]. The well-known installation is intended for use in emergency rescue operations, including on the premises of vehicles: railway, air, water, automobile and other transports, as well as in the ignition of oil, oil products, combustible chemicals. The installation is equipped with the necessary number of tanks for the initial components of the formulation composition, a heating system for the formulation components, component dispensers, a mixing chamber, a mixed mixture receiving chamber, and a gas-generating solid fuel charge. In a charged state, the installation is in constant readiness and can immediately be brought into operation at any ambient temperature, as well as in automatic fire extinguishing systems. The known installation allows the use of compositions of various formulations and can also be used for construction work, insulation of heating mains, window and door openings, ceiling ceilings, insulation of housing in the northern regions and for sorption of spilled oil and oil products, including from the surface of the water.

A disadvantage of the known installation is the presence of explosive valves in its composition. After completion of the installation, the installation must be dismantled and it is necessary to replace the specified valves with new ones. Other disadvantages of the installation include the fact that it is enclosed in a bulky case and, with an increase in the volume of containers with the original components, the installation practically loses its mobility.

Significant disadvantages of the installation should also include the fact that the supply of the starting components in the tank is not regulated. The use of dispensers in the installation does not affect the change in the characteristics of the resulting foam, since they do not provide adjustment of the flow rate of the components entering the installation.

A foam generator is also known [see certificate of the Russian Federation for utility model No. 43927, IPC 7 F04F 5/02, decl. 04/23/1999, publ. November 27, 2000], which contains a cylindrical body with flanges at the ends, in one of which a nozzle for supplying an aqueous solution of a foaming agent is installed. Openings for air supply are made in the side surface of the housing. Inside the casing, opposite the nozzle, there is a mixing chamber attached with a large base to the flange opposite the nozzle.

A disadvantage of the known technical solution is the limited functionality, which consists in the fact that the known generator can only be used to produce foam based on an aqueous solution of a foaming agent. The use of other, namely, rapidly hardening mixtures, will lead to blockage of the internal cavity of the chamber.

Another disadvantage of the known foam generator is the lack of the ability to supply a mixture of two components in it, if they were not premixed.

It should also be noted that the known design of the foam generator does not provide for the ability to control the multiplicity of the resulting foam.

Closest in technical essence to the proposed utility model is an ejection-type foam generator selected as a prototype [see RF patent for the invention No. 2401678, IPC A62C 5/00 (2006.01), decl. 08/06/2009, publ. 04/27/2010]. Known foam generator is designed for sub-layer fire extinguishing in tanks with flammable liquids. The foam generator contains: a cylindrical body with a mixing chamber, made with flanges at the ends. In one of the flanges, a nozzle is installed with an opening providing the supply of an aqueous solution necessary for foaming. Openings for air supply are made in the side surface of the housing. To increase the efficiency of the foam generator, the nozzle is made of a conical shell facing the top of the cone in the direction opposite to the flange for supplying an aqueous solution of the foaming agent. Inside the nozzle there is an ejector made in the form of a conical shell with a cowl forming a conical cavity with a conical shell and having the shape of a second-order rotation surface, for example, a ball, an ellipsoid. The conical shells of the nozzle and ejector are coaxial and between them there is a gap of the annular type with a variable cross section. The conical surfaces of the nozzle and ejector have equal angles at the vertices of the cone that forms them, and the ejector is attached to the nozzle by means of at least three ejector tubular elements, one end of which is located in the cavity of the ejector and the other in the cavity of the cylindrical body. A cylindrical horizontal duct is coaxially attached to the cone shell of the ejector, at the cut of which at least three radial ducts are located, located in a plane perpendicular to the axis of the housing and fixed at one end to the housing. The axes of the ducts are located radially and evenly in this plane, and the free end of the radial ducts is located at the cut of the horizontal duct.

The disadvantage of the closest analogue is the complexity, and, therefore, the unreliability of the design. In addition, the known foam generator can only be used to obtain foam based on an aqueous solution of a foaming agent. When using other, for example, quick-hardening mixtures, the internal cavity of the chamber will clog. The indicated phenomenon may occur as a result of the penetration of foam components between the cylindrical part and the outer casing of the foam generator.

Significant disadvantages of the closest analogue are the impossibility of supplying a mixture of two components to the foam generator if they were not mixed in advance, as well as the inability to control the multiplicity of the resulting foam.

The task set in the development of the claimed utility model is to expand the functionality of the foam generator while simplifying its design, increasing reliability, as well as reducing material costs for its manufacture.

To solve these problems, an ejection-type foam generator is proposed, which, like the closest foam generator selected as a prototype, contains a flange, an ejector, a mixing chamber, a diffuser and an air duct located along the axis, which is located in a plane perpendicular to the axis of the foam generator.

A feature of the proposed foam generator that distinguishes it from the well-known foam generator adopted as a prototype is that the flange is equipped with two nozzles connecting the foam generator mixing chamber with an automated regulator for supplying foam components. The foam generator ejector is made in the form of dies installed in a flange rigidly connected to the mixing chamber. The mixing chamber consists of two interconnected sections, the first of which, located at the inlet of the foam generator, has a larger diameter. The second section, which forms the ripening chamber, is rigidly connected to the diffuser and has a length of at least 10 meters. The air duct of the foam generator is located at the beginning of the mixing chamber.

The diameter of the mixing chamber "D" is in the range (1.2-1.4) d, where d is the diameter of the ripening chamber.

An automated controller for feeding foam components can consist of two identical components supply blocks, each of which contains a tank with components for foaming in the liquid phase, a pump for feeding components to the mixing chamber, a ball valve to control the flow of components, and two pressure transducers. Air is supplied to the mixing chamber by a compressor. Air flow control is carried out using a third ball valve, equipped with feedback from two other pressure transducers.

The most important tasks that were solved when creating the proposed utility model were:

- expanding the functionality of the foam generator;

- simplification of the design of the foam generator;

- reduction of material costs for its manufacture;

- improving the reliability of the foam generator.

The tasks were solved due to the following design features of the foam generator. Firstly, in comparison with the closest analogue, the design of the foam generator was fundamentally improved and simplified, from which all elements were removed that unnecessarily complicate and increase the cost of the structure, and, most importantly, generate unreliability and instability of its operation. Among these elements, it is necessary to note the case, inside which the foam generator itself is mounted, as well as the conical shell, which is an element of the ejector, the cowling of which is a technologically complex product, since its surface is a second-order rotation surface. In the proposed design, all elements having conical surfaces serving in the prototype for forming a gap of an annular type with a variable section are also eliminated. In addition, in the claimed design, instead of a large number of tubes (3 ejection tubes and 3 radial ducts), a single duct is installed at the beginning of the foam generator mixing chamber, which functionally replaces all the tubes mentioned above that are included in the construction of the closest analogue. Thus, when creating the proposed utility model, such an important task was solved as reducing material costs for the manufacture of a foam generator. The fundamentally new ejector design proposed in the claimed utility model contains a minimum number of parts that are simple and inexpensive to manufacture, namely: 4 threaded parts (dies) made on the basis of a standard M8 screw with axial holes of small diameter through which component solutions are pressed through the foam generator during operation No. 1 and No. 2. The most important task posed and solved when creating the proposed foam generator is to expand the functionality of the device. This problem was solved by introducing into the design of the foam generator an automated regulator for supplying foam components, with which you can control the multiplicity of the resulting foam, and two nozzles designed for its connection with the mixing chamber. One of the specific options for the pneumohydraulic circuit of an automated component feed controller is presented in paragraph 2 of the formula of the proposed utility model. It is necessary to emphasize the following. The proposed scheme is simple, consists of inexpensive purchased parts of domestic and foreign production, but, of course, requires material costs for its manufacture. However, these very insignificant material costs are offset by a significant savings in the funds required for the manufacture of the foam generator of the proposed design. Thus, the combination of the above features allows us to solve the tasks.

Below is described one of the specific examples of the implementation of the proposed utility model. The utility model is illustrated by drawings, which depict:

in FIG. 1 schematically shows a mixing chamber of the inventive ejection-type foam generator with an automated component feed regulator;

in FIG. 2 shows a foam generator in section;

in FIG. 3 is a section AA in FIG. 2 (view of the ejector).

The ejection-type foam generator (see Fig. 1-3) consists of a mixing chamber 1 and an automated controller 2 for supplying components. The mixing chamber 1 is rigidly connected to the flange 3, equipped with two nozzles 4 and 5, designed to connect the foam generator with an automated controller 2 for supplying components. Four dies 6 are installed in the flange 3, which are an ejector of the foam generator. The mixing chamber 1 consists of two interconnected sections, while the first part of the mixing chamber 1 has a larger diameter. The second section of the mixing chamber 1 forms a ripening chamber 7, which is rigidly connected to the diffuser 8. The diameter "D" of the mixing chamber 1 is (1.2-1.4) · d, where d is the diameter of the ripening chamber 7. In this particular example, the inner the diameter of the ripening chamber 7 is about 40 mm, while the inner diameter of the mixing 1 is 60 ± 5 mm. The length of the ripening chamber 7 is at least ten meters, which is due to the duration of the process of mutual diffusion of the components and their saturation with air. The duct 9 of the foam generator is located at the beginning of the mixing chamber 1. The position of the duct 9 is not random. The air entering the mixing chamber 1 in its initial section should immediately begin to swirl the flow of foaming components coming through the nozzles 4 and 5, contributing to their intensive mixing. The automated controller 2 of the supply of components in this particular example implementation of the proposed utility model consists of two blocks 10 and 11 of the supply of components. Each of the blocks contains a tank 12, 13 with components for foaming in the liquid phase, a pump 14, 15 for supplying components to the mixing chamber 1, ball valves 16, 17 for regulating the flow of components, and two pressure transducers 18.19 and 20, 21 The air in the mixing chamber 1 is supplied by means of a compressor 22. The air flow rate is regulated by means of a third ball valve 23, equipped with feedback with two pressure transducers 24 and 25.

In the claimed utility model, pump NMSh 5-25-2.5 / 6-5 (Livmash LLC, Russia) that can be used commercially available by the domestic industry can be used as pump 14;

- as pump 15 - pump Lowarra SHE 25-200 / 40 (Lowarra, Italy);

- as a compressor 22 - compressor Fiac NEW SILVER 20/300 (Fiac, Italian production);

- as ball valves 16, 17 and 23 - R323 valves with electric Belimo LR24A-SR (Belimo, Switzerland);

- as pressure transducers 18, 19, 20, 21, 24, 25 - pressure transducers Trafag NAT 10.0 A (Trafag, Switzerland).

The operation of the ejection-type foam generator to obtain carbide-formaldehyde foam (CFP) with an automated component feed regulator is as follows.

In the mixing chamber 1 of the foam generator (see Fig. 1 and Fig. 2) 3 components are supplied: from the tanks 12 and 13 with the help of pumps 14 and 15, the components No. 1 and No. 2 in the liquid phase are supplied to the corresponding nozzles 4 and 5. Through the nozzles 6, these components are pressed and fed into the mixing chamber 1. Air is supplied via the air compressor 22 through the duct 9 to the mixing chamber 1. The flow rate control of components No. 1 and No. 2 occurs using ball valves 16 and 17, respectively. Ball valves 16 and 17, regulating the flow of components No. 1 and No. 2, are equipped with feedback from pressure transmitters 18, 19 and 20, 21, respectively. Regulation of air flow occurs due to the ball valve 23, equipped with feedback from pressure transducers 24 and 25.

During the operation of the foam generator through the use of ball valves 16 and 17, the components supplied to the mixing chamber 1 are regulated. From the mixing chamber 1, air-saturated components No. 1 and No. 2 enter the ripening chamber 7, in which the mutual diffusion of components No. 1 and No. 2, and the process of saturating them with air continues (ripening). Unused components are returned to tanks 12 and 13, respectively. Unused air flow is released into the atmosphere through a ball valve 23 (see Fig. 1).

Thus, in the inventive utility model, due to the significant simplification of the design of almost all the main components of the foam generator, the creation of a fundamentally new ejector, as well as equipping the foam generator with an automated regulator for the supply of foam components, the reliability of its design is significantly increased and its functionality is expanded. Using a foam generator of the claimed design, it became possible to obtain carbide-formaldehyde foam of different multiplicity.

Claims (2)

1. An ejection-type foam generator containing a flange, an ejector, a mixing chamber located along the axis, a diffuser and an air duct located in a plane perpendicular to the axis of the foam generator, characterized in that the flange is equipped with two nozzles connecting the foam generator mixing chamber with an automated regulator for supplying foam components, an ejector made in the form of dies installed in a flange rigidly connected to the mixing chamber, which consists of two interconnected sections, the first of which aspolozhenny foam generator at inlet has a larger diameter, the second portion forming the ripening chamber is rigidly connected to the diffuser and has a length of at least 10 m, and the duct is located at the beginning of the mixing chamber. 2. The ejection-type foam generator according to claim 1, characterized in that the diameter of the mixing chamber D is (1.2-1.4) · d, where d is the diameter of the ripening chamber, the automated controller for feeding the foaming components consists of two identical components supply units each of which contains a tank with components for foaming in the liquid phase, a pump for supplying components to the mixing chamber, a ball valve to control the flow of components and two pressure transducers, while air is supplied to the mixing chamber using a compressor litter, and air flow regulation is carried out by a third ball valve provided with feedback from the other two pressure transducers.

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