RU137757U1 - AUTOMATIC FOAM FORMER DOSING INSTALLATION - Google Patents

Abstract

1. Automatic installation of dispensing foaming agent containing a pump, hydrostatic transmission, flow meter, control unit and parameter control, characterized in that it additionally introduced a twin pump unit, which is a pair of identical foam pumps with a synchronous drive from a hydrostatic transmission, which includes two a hydraulic motor, a flow divider and one hydraulic oil pump, and a vacuum filling system with the possibility of repeatedly increasing the time of continuous operation installation on fire due to the connection to additional external sources of foaming agent. 2. The automatic dispenser for dosing the foaming agent according to claim 1, characterized in that the vacuum filling system includes a vacuum pump, two vacuum taps (shutters) and two sensors for recording the filled state, containing a pump for supplying the foaming agent under pressure to the injection points (foam pump), driven by hydrostatic transmission.

Description

Automatic installation of dispensing foaming agent The proposed utility model relates to the field of engineering and is used in fire fighting equipment.

The prior art automatic dispensing installation of the foaming agent FoamPro Accu Max (http://www.foampro.com/FileAttachments/FoamPro/en-us//Literature/OIPMS/FSG_847_LR.pdf), selected by the applicant as a prototype for the proposed utility model.

The specified prototype is a technical system, which includes the following elements:

- a pump that supplies the blowing agent under pressure to the injection points (hereinafter referred to as the foam pump);

- hydrostatic transmission of the foam pump;

- one or more control throttles (according to the number of foam mixing channels);

- one or more flowmeters of the foaming agent flow (by the number of foam mixing channels);

- one or more flow meters of the water flow (by the number of foam mixing channels);

- control unit and parameter control;

- connecting, fixing and other auxiliary elements.

The principle of operation of this prototype is based on providing a metered injection of a foaming agent into the water stream. The metered injection of the foaming agent is provided by regulating its flow with the help of a regulating throttle. The specified throttle is controlled by an electronic unit that generates control actions (electrical signals) based on data received from control and measuring devices - water flow meters and a foaming agent. (In the multi-channel version, each control channel has its own regulating throttle).

The supply of the foaming agent from the source (source reservoir) to the injection points in the specified prototype is provided by a foam pump, the drive of which is carried out using a hydrostatic transmission. The hydrostatic transmission has a hydraulic motor and a hydraulic oil pump.

The disadvantages of the prototype are the limited operating range of the flow, due to the performance limit of the foam pump, as well as the inability to connect to additional (external) sources of foaming agent located outside the fire truck, which are installed at a level below the foam pump.

Common features with the new technical solution and prototype are a pump, hydrostatic transmission, flow meter, control unit and parameter control.

The objective of the utility model is to increase the operating range of the flow rate of the automatic installation of the foaming agent dosing, as well as providing the ability to connect to additional (external) sources of the foaming agent.

The technical result consists in a twofold increase in the productivity of the proposed technical solution, as well as the possibility of using additional (external) sources of foaming agent.

An automatic foaming agent dosing unit containing a pump, hydrostatic transmission, flow meter, control and parameter control unit, and a dual pumping unit, which is a pair of identical foam pumps with a synchronous drive from a hydrostatic transmission, which includes two hydraulic motors, a flow divider, and is additionally introduced. one hydraulic oil pump and vacuum filling system, with the possibility of repeatedly increasing the time of continuous operation of the installation re by connecting to additional external sources of foaming agent.

The vacuum filling system includes a vacuum pump, two vacuum valves (shutters) and two sensors for detecting the filled state containing a pump for supplying a foaming agent under pressure to the injection points (foam pump), driven by a hydrostatic transmission.

The technical result is provided by the introduction of additional features, presented in the form of a twin pump unit and a vacuum filling system, which makes it possible to repeatedly increase the time of continuous operation of the installation in a fire due to the possibility of connecting to additional external sources of foaming agent.

In quantitative terms, the obtained technical result can be characterized by the following data. The volume of transportable stock of foaming agent in a fire truck can be about 5 tons. At nominal flow rates, such a stock of foaming agent can be spent in 10 ... 15 minutes of operation. In case of large fires, an additional supply of foaming agent in external containers, in the amount of tens of tons, can be delivered to the extinguishing site. Thus, the increase in the time of continuous operation of the installation as a result of the implementation of the inventive utility model can reach 5 ... 10 times.

The applicant has developed an experimental test sample which showed the possibility of increasing the range of costs of the foaming agent solution from 3 l / s to 180 l / s, as well as the ability to select the foaming agent from extraneous sources from a height of more than 1 m.

According to the functional diagram of FIG. The applicant developed and manufactured an experimental sample, the tests of which showed the efficiency and effectiveness of technical solutions corresponding to the given set of features of a utility model.

The proposed device is illustrated by the functional diagram of the automatic installation of dispensing foaming agent, shown in Fig. To explain the principle of operation, the diagram shows not only elements related to the dosing unit itself, but also adjacent elements of the fire truck.

The proposed technical solution includes the following elements:

- a pumping unit that provides a foaming agent under pressure to the injection points, which consists of two identical foam pumps pos. 16 and pos. 17;

- two identical hydraulic motors pos. 25 and pos. 26, providing the drive of the above foam pumps (pos. 17 and pos. 16, respectively);

- hydraulic oil pump pos. 32, providing oil for operation of hydraulic motors pos. 25 and pos. 26, with safety relief valve pos. 27, designed to relieve excess oil overpressure;

- flow divider pos. 28, providing synchronous operation of hydraulic motors pos. 25 and pos. 26 due to equal distribution (halving) of the total oil flow generated by the hydraulic oil pump pos. 32. Structurally, the flow divider pos. 28 is made of two identical hydraulic motors pos. 29 and pos. 30, the rotors of which are mechanically interconnected.);

- Electrostatic coupling of hydrostatic transmission pos. 31, providing mechanical connection (disconnection) of the hydraulic oil pump pos. 32 to the power unit of the fire truck. In the functional diagram of FIG. the power unit of a fire truck is conventionally shown by three elements that are not part of the automatic foaming agent dosing unit: ICE pos. 1, power take-off pos. 2 and belt drive pos. 33;

- Regulating throttle pos. 9, providing a restriction of the flow of foaming agent directed to the injection into the water line;

- flow meter foaming agent pos. 10, providing continuous measurement of the actual current flow rate of the blowing agent and the transmission of the corresponding electrical signals to the control unit;

- water flow meter pos. 6, providing continuous measurement of the actual current water flow and the transmission of the corresponding electrical signals to the control unit;

- control unit and parameter control pos. 11, which provides the processing of electrical signals from measuring instruments and sensors, the formation and issuance of control actions (electrical signals) on the controlled elements, which are the control throttle pos. 9 and the hydraulic oil pump pos. 32, as well as providing a visual display of controlled parameters;

- auxiliary sensors for monitoring water pressure pos. 4 and the pressure of the foaming agent pos. 14, providing measurement of the corresponding values.

- vacuum pump with autonomous electric drive pos. 12, providing a vacuum in the internal cavities of the suction pipe pos. 23 and foam pump cavities pos. 16 and pos. 17;

- two vacuum taps (shutters) pos. 18 and pos. 13, providing the message of the vacuum pump pos. 12 with internal cavities of the suction pipe pos. 23 and foam pumps pos. 16 and pos. 17 (from the outlet side), respectively, for pumping air and creating a vacuum in these cavities;

- two sensors for recording the filled state pos. 15 and pos. 19, providing the issuance of electrical signals indicating the completion of the process of filling the foaming agent of the respective cavities.

In addition, in the diagram of FIG. Functional elements are shown that are not directly related to the automatic setting of the foaming agent dispensing, but which are adjacent elements of the fire truck, namely:

- The main engine of the fire engine (ICE) pos. one;

- centrifugal water pump pos. 3, providing water for extinguishing fires (main fire pump);

- power take-off pos. 2, providing the drive of the main fire pump pos. 3, as well as the drive of the hydraulic oil pump pos. 32 by means of a belt drive pos. 33 and electrofusion pos. 31;

- check valves pos. 5 and pos. 8, preventing the abnormal movement of extinguishing fluids (water and foaming agent);

- main pressure valve pos. 7, providing the supply of water (or an aqueous solution of a foaming agent) to fire extinguishing barrels and water-jet devices (monitors, foam generators, etc.);

- group of inlet foam gate valves pos. 20, 21 and 22, providing the connection of an automatic installation of dispensing the foaming agent to one or another source (reservoir) of the foaming agent, two of which, as a rule, are located as part of a fire truck, and the third is external (additional);

- suction pipe pos. 23, providing the connection of an automatic installation of dispensing the foaming agent to the sources of the foaming agent;

- oil tank (oil tank) pos. 24, providing the placement of oil necessary for the hydrostatic transmission.

According to the functional diagram of FIG. The applicant developed and manufactured an experimental sample, the tests of which showed the efficiency and effectiveness of technical solutions corresponding to the given set of features of a utility model.

The mentioned experimental sample can be considered as one of the possible options for the constructive implementation of the above circuit solutions. In particular, the following components were used to manufacture the experimental sample:

- as foam pumps (pos. 16 and pos. 17) gear pumps made of corrosion-resistant materials were used;

- hydraulic motors (pos. 25, 26, 29 and 30) - reversible axial piston hydraulic machines with constant displacement (unregulated);

- a hydraulic oil pump (pos. 32) - an axial piston hydraulic machine with a variable displacement (adjustable), with proportional control and an integrated safety bypass valve (pos. 27);

- electrical coupling (pos. 31) - single-friction friction, designed to operate on DC 24 V;

- a regulating throttle (pos. 9) - a ball valve with a direct current electric drive and an integrated gearbox that provides the necessary smoothness of movement;

- flow meters (pos. 6 and pos. 10) - electromagnetic type with frequency output, providing the necessary measurement ranges and speed (update rate of readings);

- control unit (pos. 11) - original design, providing the necessary algorithms for processing signals and generating control actions;

- pressure monitoring sensors (pos. 4 and pos. 14) - strain gauges with current output, providing the necessary measurement ranges;

- a vacuum pump (pos. 12) - gate (plate) type with an independent electric drive, providing the necessary pumping speed;

- vacuum locks (pos. 13 and pos. 18) - ball valves with pneumatic control, with a bore DN 15;

- sensors for recording the filled state (pos. 15 and pos. 19) - sensors for monitoring the fluid level of a posistor type with a current output.

The proposed automatic installation of dispensing foaming agent works as follows:

Fire pump pos. 3 provides water supply through the water line through the check valve pos. 5 and the flow meter pos. 6 to the outlet pressure valve pos. 7. At the same time, information about the amount of consumed water enters the control and monitoring unit pos. eleven.

When the unit is turned on, the electrical coupling pos. 31, and the shaft of the hydraulic oil pump pos. 32, which immediately begins to provide oil at the initial (minimum) level.

From the output of the hydraulic oil pump pos. 32 the oil flow under pressure enters the flow divider pos. 28, which consists of two hydraulic motors (pos. 29 and pos. 30), always rotating only at the same speed (since their shafts are interconnected), are forced to pass the same amount of oil through themselves. Those. oil flow passing through the divider pos. 28, is divided into two equal parts, each of which further enters the hydraulic motors pos. 25 and pos. 26.

Getting equal flows of oil, hydraulic motors pos. 25 and pos. 26 (identical in design and displacement) ensure strictly synchronized rotation of both foam pumps pos. 16 and pos. 17, and the latter (also being the same hydraulic volumetric type machines), in turn, provide the same foaming agent supply.

In the case of a dosing unit operating from the built-in capacities of a fire truck, the foaming agent through a corresponding inlet valve (pos. 20 or pos. 21 or pos. 22) flows by gravity through the pipeline pos. 23 at the entrance of the foam pumps pos. 16 and pos. 17 and further, already under pressure, through the flow meter pos. 10, adjusting the throttle pos. 9 and check valve pos. 8 - for injection into the water main.

Thus, to the outlet pressure valve pos. 7 already mixed solution of the foaming agent.

In the course of work in the control unit pos. 11 compares the data on the current flow rate of water and the current flow rate of the foaming agent, respectively, received from the flow flow meters pos. 6 and pos. 10. If the ratio of these values deviates from the set value, which is previously entered into the control unit as a preset, then from the control unit to the throttle pos. 9, a corresponding control signal is supplied — either to narrow or expand its bore.

As a result of changing the flow area of the control throttle (key 9), a corresponding change in the amount of blowing agent passing through it occurs: when the section is narrowed, the amount of blowing agent decreases, and when expanding, it increases.

In addition, the amount of foaming agent supplied to the injection by foam pumps pos. 16 and pos. 17 is controlled by changing the speed of these pumps, which in turn varies by changing the performance of the hydraulic oil pump pos. 32.

Performance control of hydraulic oil pump pos. 32 is carried out by supplying the corresponding control electrical signals, which are generated by the control unit according to a separate algorithm (said algorithm has no relation to the essence of this application).

In the case of the operation of the dosing unit from external containers in which the foaming agent is located lower in level than the foam pumps, a vacuum filling system is included in the work. The operation of the specified vacuum system is as follows:

When you turn on the vacuum system at the same time open the vacuum valves (gates) pos. 13 and pos. 18 and the vacuum pump pos. 12.

As the vacuum pump operates, a vacuum builds up in the internal cavities of the suction pipe pos. 23, foam pumps pos. 16 and pos. 17, as well as in the cavity of the connecting sleeve connecting the external container with the foaming agent and the suction pipe pos. 23. Due to this vacuum, the foaming agent rises through the pipelines and fills all the vacuumed cavities.

At the end of the filling process, close the vacuum valves (gates) pos. 13 and pos. 18 and stop the vacuum pump pos. 12. Further, foam pumps can already supply a foaming agent from an external source.

The shutdown algorithm of the vacuum filling system, built according to the proposed scheme, works as follows:

- vacuum valve pos. 18 is closed by the signal of readiness of filling, coming from the sensor pos. 19;

- vacuum valve pos. 13 is closed by the signal of readiness of filling, coming from the sensor pos. fifteen;

- vacuum pump pos. 12 stops after closing both vacuum valves (key 13 and key 18).

To ensure the convenience of operation, the specified control algorithm is implemented by issuing appropriate automatic commands generated by the existing control and monitoring unit pos. eleven.

The presence of two separate vacuum lines: from the suction pipe side (through the vacuum valve pos. 18) and from the outlet of the foam pumps (through the vacuum valve pos. 14) ensures guaranteed filling of all cavities and the absence of air plugs in the lines that impede the movement of the foaming agent, which allows provide connection to additional (external) sources of foaming agent.

The proposed development, characterized by the claimed combination of features meets the criterion of "novelty."

The proposed device can be manufactured on an industrial scale and will find application in mechanical engineering, in particular, in fire fighting equipment, i.e. characterized by the criterion of "industrial applicability".

The proposed technical solution provides at least a twofold increase in the productivity of the foaming agent dosing unit, as well as the possibility of using additional (external) sources of the foaming agent.

Claims (2)

1. Automatic installation of dispensing foaming agent containing a pump, hydrostatic transmission, flow meter, control unit and parameter control, characterized in that it additionally introduced a twin pump unit, which is a pair of identical foam pumps with a synchronous drive from a hydrostatic transmission, which includes two a hydraulic motor, a flow divider and one hydraulic oil pump, and a vacuum filling system with the possibility of repeatedly increasing the time of continuous operation installation on fire due to the connection to additional external sources of foaming agent. 2. The automatic dispenser for dosing the foaming agent according to claim 1, characterized in that the vacuum filling system includes a vacuum pump, two vacuum taps (shutters) and two sensors for recording the filled state, containing a pump for supplying the foaming agent under pressure to the injection points (foam pump ), driven by a hydrostatic transmission.

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