RU174264U1 - The tank is membrane expansion - Google Patents

Abstract

The invention relates to the design of expansion tanks used in liquid recirculation devices, in particular, it can be used in the field of fire fighting equipment in foam fire extinguishing systems and is designed to smooth (compensate) and accumulate foam concentrate. The technical result is to increase the reliability of the tank design and its efficiency. The claimed technical result is achieved by the fact that in the expansion tank is a membrane containing a housing, in which an e astichnaya membrane separating the interior of the housing to the air chamber and the cavity with fluid, according to the utility model in the air cavity in the housing wall in the lower part of the sensor disturbances elastic membrane integrity, which is sensitive to a medium other than water. The elastic membrane is made of butyl rubber. 2 ill.

Description

The invention relates to the construction of expansion tanks used in liquid recirculation devices, in particular, it can be used in the field of fire fighting equipment in foam fire extinguishing systems and is intended for smoothing (compensation) and accumulating foam concentrate.

The prior art known expansion tank (patent for utility model RU No. 46079) containing a rigid body with an elastic membrane dividing it into a sealed expansion and atmospheric cavities of mutually changing volumes. The expansion cavity is configured to communicate with the hydraulic system. The elastic membrane is equipped with gas valves that allow only gas to pass from the expansion cavity into the atmospheric cavity. Gas locks are installed opposite the zones of probable gas accumulation in the expansion cavity, that is, at the upper points of the elastic cuff. The number of gas gates is one or more, depending on the number of zones of probable gas accumulation.

Also known from the prior art is the arrangement of a membrane expansion tank described on the website http://stroy-svoimi-rukami.ru/vodoprovod/bak/9/. The membrane expansion tank is a sealed vessel containing two compartments separated by a flexible membrane: the air compartment contains air at a certain constant pressure, the water compartment is connected to a water supply or heating system, and water comes under different pressure. The compartments are separated by an elastic membrane, which is able to compress and stretch, thereby changing the ratio between the volumes of one and the second compartments. The air compartment has a valve with a nipple through which air pressure can be changed, thereby regulating the operation of the membrane tank.

As the closest analogue (prototype), a deaeration-expansion membrane tank (patent for invention RU No. 2467254) was selected, consisting of a housing inside which a membrane was installed, which was hermetically fixed in it with a flange, while the internal volume of the membrane was made equal to the volume of deaeration - an expansion membrane tank, and in the lower part of the housing there are installed heating medium coolant pipes and an overflow pipe nozzle, while the membrane and the housing in the upper part are equipped with non-return valves, while the ear volume of the body of the deaeration-expansion membrane tank is connected to the atmosphere through a non-return valve and is insulated with thermal insulation.

The technical problem to which the claimed utility model is directed is the difficulty in determining the integrity of the elastic membrane of the expansion tank and the timely replacement of the elastic membrane.

The technical result is to increase the reliability of the design of the tank and its efficiency.

The claimed technical result is achieved by the fact that in the expansion tank is a membrane containing a housing in which an elastic membrane is fixed using a flange that separates the interior of the housing into an air cavity and a cavity with a working medium, according to a utility model, in the air cavity on the wall of the housing in its lower part of the installed sensor leakage of the elastic membrane, which is sensitive to a medium other than water. The elastic membrane is made of butyl rubber.

The presence of a casing in which an elastic membrane is fixed with a flange that separates the internal space of the casing into an air cavity and a cavity with a working medium ensures the operability of the tank, its tightness and contributes to the reliable operation of the tank.

The presence of a leakage sensor of the elastic membrane provides timely detection, as well as the possibility of indicating a leakage of the elastic capacity, which increases the reliability of the device and increases its efficiency.

The installation of a sensor for leakage of the elastic membrane on the wall of the housing in its lower part ensures optimal placement of the sensor in the housing from the point of view of early detection of leakage of the working medium as a result of violation of the tightness of the elastic membrane, which improves the reliability and efficiency of the device.

The implementation of the sensor is sensitive to a medium other than water, which makes it possible to detect in the air cavity a working medium that has an acidity (pH) other than the pH of the water, which also helps to increase the reliability and efficiency of the device.

The use of butyl rubber as a membrane material is due to the properties of this material, which can withstand up to 100 thousand loading cycles, which helps to increase the reliability and efficiency of the device.

Patent studies have not identified devices characterized by the claimed combination of features, therefore, we can assume that this device meets the criterion of "novelty."

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

The essence of the claimed technical solution is illustrated by drawings, where in FIG. 1 shows the internal cavities of the tank; FIG. 2 - tank outside.

The expansion membrane tank contains a housing 1 (Fig. 1, 2), in which an elastic membrane 3 made of butyl rubber is fixed using a flange 2.

The membrane 3 divides the internal space of the tank body into an air cavity 4 and a cavity with a working medium (foaming agent) 5. In the air cavity on the wall of the body 1 in its lower part there is a sensor for leakage of the elastic membrane 6, which is sensitive to an environment other than water. The specified sensor responds to the appearance inside the housing 1 of the working medium (foaming agent) having an acidity (pH) other than the pH of the aqueous medium.

The housing 1 can be made, for example, in the form of a steel sealed tank.

The membrane 3 is connected to the fire extinguishing system through the flange 7, while the pressure of the foam is fixed by the sensor 8. The valve 10 is designed to order in the cavity 4 of the air, while the air pressure in the cavity 4 is controlled by a pressure gauge 9.

The expansion membrane tank operates as follows.

Pre-carry out the injection of air into the cavity 4 to 0.15 MPa, the value of which is controlled using a pressure gauge 9.

The membrane tank is built into the fire extinguishing system, and through the flange 7, the cavity with the working medium (foaming agent) 5 is connected to the specified fire extinguishing system. The nominal volume of the cavity 5 with the working medium of the tank, described further in the example of a specific embodiment, is 500 l. With increasing temperature, the volume of the foam increases by 140 l., The membrane 3 expands, while the pressure in the air cavity 4 increases to 0.42 MPa - temperature compensation occurs.

In case of leakage of the working medium in the fire extinguishing system lines or when the fire extinguishing system is triggered in case of fire, the membrane 3 discharges the foam into the system in the required volume, while the main fire extinguishing system pumps are not turned on until the pressure in the system reaches 0.5 MPa. Thus, in the presence of expansion membrane tanks, pumps are switched on much less frequently, their service life is increased, and the use of expansion membrane tanks is economically feasible.

In case of violation of the integrity of the elastic membrane 3, foaming agent leaks into the lower part of the housing 1, a change in the pH value fixes the sensor 6 and sends a signal through the electronic control unit (not shown) to the operator’s workstation.

An example of a specific implementation of an expansion membrane tank is the BDP-027 (BMR) tank, developed at the applicant’s enterprise, which is a steel tank under pressure for working with foam concentrate.

The maximum working pressure of the tank is 3 bar, the operating temperature range is -10 ... + 100 ° C, the preliminary air pressure is 1.5 bar.

Operating parameters BMR at Po = 0.15MPa:

V = 100 l (Extinguishing agent, cavity 5, Fig. 1) Po = 0.15MPa
(Cavity 4, Fig. 1) Po = 0.05 (Pump start) 250 0.20 (Leakage = 250l) 500 (Nominal Volume) 0.30 (Pump shutdown) 640 0.42 (Max temp. Extensions) = 140l 850 1.00 875 1.20 Air triggered. safety valve 880 (Max Qty) 1.25

The specified expansion membrane tank is used in water supply systems, fire extinguishing, pressure boosting installations to compensate for the thermal expansion of water, eliminate water hammer in the system, accumulate excess volume, which should provide a set of organizational and technical measures to maintain the filled solution pipelines in constant readiness to extinguish fires,

namely:

- control of pipelines filled with the working solution for leaks, by maintaining the pressure in them within the established limits and issuing signals to the automated fire extinguishing control system (ACS ПТ), in case of pressure exceeding the working range;

- compensation for a certain amount of leaks of extinguishing agents in filled pipelines;

- Compensation of temperature expansions of extinguishing agents in filled pipelines;

- fixing the fence of extinguishing agents from the external networks of filled pipelines through fire hydrants, combs when a mobile fire or other adapted equipment is connected to them.

The proposed solution eliminates the difficulty in determining the integrity of the elastic membrane of the expansion tank in the process of its operation, allows you to timely eliminate the collapsed elastic membrane, which helps to increase the reliability of the design of the tank and its efficiency.

Claims (2)

1. The expansion tank is a membrane containing a housing in which an elastic membrane is fixed using a flange that separates the interior of the housing into an air cavity and a cavity with a working medium, characterized in that an elastic leakage sensor is installed in the air cavity on the wall of the housing in its lower part membranes that are sensitive to a medium other than aqueous. 2. The tank membrane expansion according to claim 1, characterized in that the elastic membrane is made of butyl rubber.

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