EA038911B1 - System for feeding and injecting a powder fire-extinguishing agent and lifting fire truck - Google Patents

Abstract

The invention relates to a system for feeding an injecting a powder fire-extinguishing agent and to a lifting fire truck. Said system for feeding an injecting a powder fire-extinguishing agent includes a high pressure gas source; a pot for the powder fire-extinguishing agent having an inlet for gas and an outlet for the powder fire-extinguishing agent, wherein said inlet for gas is communicated with said high pressure gas source; an injector for the powder fire-extinguishing agent that is communicated with said outlet for the powder fire-extinguishing agent; a first pressure relief valve fluidly coupled between said inlet for gas and the high pressure gas source; and a flow balancing unit located between said high pressure gas source and said pot for the powder fire-extinguishing agent to ensure the flow capacity through said inlet for gas, equal to the flow capacity through the outlet for the powder fire-extinguishing agent, by controlling the amount of incoming gas from said high pressure gas source towards said pot for the powder fire-extinguishing agent. According to the embodiment of the invention, the pressure in said pot for the powder fire-extinguishing agent is maintained stable during the injecting process.

Description

Technology area

The present invention relates to the technical field of fire extinguishing and, in particular, to a system for supplying and pumping a powder extinguishing agent and a fire truck with a lift.

State of the art

According to the powder fire extinguishing agent supply and injection system, the powder fire extinguishing agent stored in the powder fire extinguishing agent tank is fluidized with an inert gas such as nitrogen and the like taken as a working gas, fed into the powder fire nozzle, or the powder fire monitor through the transport pipeline and as a result is injected by means of the specified powder fire barrel or the specified powder fire monitor. The main process of operation of the specified system for supplying and pumping a powder fire extinguishing agent includes the following stages:

- filling a container for a powder fire extinguishing agent using a high pressure cylinder for storing gas and fluidizing said powder fire extinguishing agent in said container for a powder fire extinguishing agent under a predetermined pressure;

- opening the outlet valve for the powder extinguishing agent and connecting the two-phase flow of the specified powder extinguishing agent and nitrogen to the specified transport pipeline; and

- supply of the specified two-phase flow of powder extinguishing agent and nitrogen to the blower of powder extinguishing agent for injection and injection into the place of fire extinguishing.

In the above-described working process, pressure is one of the main parameters of the specified system for supplying and pumping a powder extinguishing agent. In particular, at stage 1, it is necessary to take into account the design working pressure of the specified container for the powder extinguishing agent; at stage 2, it is necessary to take into account the decrease in pressure in the process and the local decrease in the pressure of the specified two-phase flow of powder extinguishing agent and nitrogen in the specified transportation pipeline; at stage 3, it is necessary to take into account the decrease in the head pressure caused by the operating state of the lift of the specified blower of the powder extinguishing agent.

In addition, taking into account the interconnection of the sequence of the above stages, the final discharge pressure of the powder fire extinguishing agent is achieved by including the pressure reduction in stages 2 and 3 in the calculations based on the calculated working pressure of the container for the powder fire extinguishing agent in stage 1. Therefore, in the process of feeding, it is necessary to comprehensively take into account the indicated calculated operating the pressure of the specified container for the powder extinguishing agent and the decrease in pressure in each link, so that the specified final discharge pressure of the powder extinguishing agent meets the fire requirements.

In addition, considering that the flow area at the gas inlet of the specified powder fire extinguishing agent tank is usually less than the flow area at the outlet for the powder extinguishing agent, and the pressure of the specified powder fire extinguishing agent tank in step 2 rapidly decreases during the injection process, is it is necessary that the specified design working pressure of the specified container for a powder fire extinguishing agent in stage 1 additionally creates a sufficient pressure margin to respond to the effect of a rapid drop in pressure during supply and injection.

Theoretically, if the filling pressure of the gas storage cylinder on the indicated container for the powder extinguishing agent can be increased so that the supply and injection system of the powder extinguishing agent acquires a sufficiently high initial pressure at stage 1, then the pressure reduction in subsequent stages can be easily dealt with, a sufficient supply pressure can be built up and a sufficient discharge pressure can be obtained as a result. However, an increase in the specified filling pressure requires an increased ability of the specified container for a powder extinguishing agent to withstand the pressure, which will inevitably lead to an increase in the wall thickness of the specified container for a powder extinguishing agent, thereby increasing the weight and cost of the body of the specified container; in addition, high operating pressures can create a new potential safety hazard for the entire powder supply and injection system.

Thus, the discharge pressure, pipeline length, and the lift operating state of the existing powder fire extinguishing agent supply and discharge system will be limited by the design operating pressure of the powder fire extinguishing agent container. In particular, for a fire truck with a hoist having a large lift height, a significant difference in height and a noticeable length of the transport pipeline will cause a more pronounced decrease in head pressure and a decrease in pressure in the pipeline.

Consequently, existing lift trucks, especially those with high lift heights, often have a serious problem of insufficient delivery pressure at a later stage of supply and discharge, with a rapid drop in discharge pressure during discharge during lifting. In addition, with a decrease in the discharge pressure, the feed rate of the two-phase flow of a powder fire extinguishing agent and nitrogen is significantly reduced, which leads to the deposition of the specified powder

- 1 038911 the discharge rate of the powder extinguishing agent from the powder extinguishing agent container and as a result causing a high percentage of the remaining powder extinguishing agent in said powder extinguishing agent container after injection. Accordingly, it is necessary to design a blowdown pipeline in the existing system for supplying and pumping a powder fire extinguishing agent so as to clean the sediment of said powder fire extinguishing agent in said blowdown pipeline after injection.

The essence of the invention

With this in mind, an embodiment of the present invention provides a powder extinguishing agent supply and injection system that can maintain a stable pressure in the powder extinguishing agent container during the injection process.

In one aspect of the present invention, a powder extinguishing agent delivery and injection system is provided. The specified system of supply and injection of a powder fire extinguishing agent includes:

high pressure gas source;

a container for a powder extinguishing agent having a gas inlet and an outlet for a powder extinguishing agent, said gas inlet communicating with said high pressure gas source;

a powder extinguishing agent blower, which communicates with the specified outlet for a powder extinguishing agent;

a first pressure reducing valve fluidly connected between said gas inlet and a high pressure gas source; and a flow balancing unit positioned between said high pressure gas source and said powder extinguishing agent container to provide a flow rate through said gas inlet equal to the flow rate through said powder extinguishing agent outlet by controlling the amount of inlet gas from the specified source of high pressure gas to the specified container for the powder fire extinguishing agent.

In some embodiments, the implementation of the specified first pressure reducing valve is an electrical proportional pressure reducing valve. The specified flow balancing unit includes:

a timer configured to record the time of supply and discharge of the specified container for the powder extinguishing agent;

a pressure sensor configured to measure the current pressure in the specified container for the powder extinguishing agent; and wherein said electric proportional pressure reducing valve is in communication with said timer and pressure transducer, and the outlet pressure of said electric proportional decreasing pressure valve is adjusted in accordance with said delivery and delivery times and said current pressure.

In some embodiments, the implementation of the specified outlet pressure of the electric proportional pressure reducing valve is set equal to or less than the first pressure value when the container for the extinguishing powder is in a fluidized state; and said outlet pressure of the electric proportional pressure reducing valve is set equal to a second pressure value in which said second pressure value is greater than or equal to said first pressure value.

In some embodiments, the implementation of the specified first pressure value is calculated by subtracting 0.1-0.2 MPa from the maximum working pressure of the specified container for the powder extinguishing agent, the specified second pressure value is calculated as a variable function of the specified current pressure and the specified delivery and injection times, and the specified the current pressure does not exceed the value of the difference obtained by subtracting 0.1-0.3 MPa from the specified first pressure value.

In some embodiments, the implementation of the specified outlet pressure of the electric proportional pressure reducing valve is set such that it decreases when the specified current pressure is equal to the value of the difference obtained by subtracting 0.1-0.3 MPa from the specified first pressure value.

In some embodiments, said first pressure reducing valve is an electrical proportional pressure reducing valve, and said flow balancing unit further includes:

a first flow rate meter configured to measure a first current flow rate of the gas inlet;

a second flow rate meter configured to measure a second current flow rate of the powder extinguishing agent outlet; and in which said electrical proportional pressure reducing valve is in

- 2 038911 communication connection with the specified first flow rate meter and the specified second flow rate meter, and the degree of opening of the specified electric proportional pressure reducing valve is adjusted in accordance with the specified first current flow rate and the specified second current flow rate.

In some embodiments, the implementation of the specified degree of opening of the electric proportional pressure reducing valve decreases when the specified first current flow rate is greater than the specified second current flow rate, and increases when the specified first current flow rate is less than the specified second current flow rate, such that the specified second current flow rate is in the specified bandwidth range.

In some embodiments, the implementation of the specified flow balancer includes:

a second pressure reducing valve connected between said gas inlet and a high pressure gas source and connected in parallel with said first pressure reducing valve.

In some embodiments, the implementation of the specified outlet pressure of the specified first pressure reducing valve and the specified outlet pressure of the second pressure reducing valve are set so that they are not higher than the value of the difference from subtracting 0.1-0.2 MPa from the maximum operating pressure of the specified container for powder extinguishing agent and the flow rate at the outlet of said second pressure reducing valve is set to be higher than the flow rate of said first pressure reducing valve.

In some embodiments, said flow balancing unit further includes:

a first changeover valve located between said first pressure reducing valve and a gas inlet;

a second switching valve located between said second pressure reducing valve and a gas inlet; and wherein said first switching valve is open when said powder extinguishing agent container is in a fluidized state and said second switching valve is closed when said powder extinguishing agent container is in a fluidized state; and said first switching valve and said second switching valve are open when said powder fire extinguishing agent container is in the supply and pumping state.

In some embodiments, said powder extinguishing agent container has an exhaust port and said powder extinguishing agent supply and injection system further includes:

a third switching valve located between said first pressure reducing valve and a powder extinguishing agent blower;

an exhaust valve located between the specified exhaust port and the external environment; and a filtering device located between said exhaust valve and an exhaust port.

In another aspect of the present invention, a lift truck is provided. Said hoist fire truck includes said powder extinguishing agent supply and injection system, in accordance with any of the above embodiments.

Thus, in accordance with said powder extinguishing agent supply and injection system and said elevator-equipped fire engine, which are proposed in an embodiment of the present invention, the pressure of said powder extinguishing agent container is kept stable during the injection process, and the problem associated with the fact that The existing powder extinguishing agent supply and discharge system tends to lack the discharge pressure at a later stage due to injection under reduced pressure, it is solved.

In addition, in an embodiment of the present invention, an increase in the amount of inlet gas in the process of feeding and pumping does not affect the maturation process on the process of fluidization of the flow, provides the supply and discharge pressure of the specified container for the powder fire extinguishing agent, increases the rate of injection of the powder the specified container for a powder fire extinguishing agent, and also allows you to avoid a decrease in the feed rate of the gas-powder fire extinguishing agent, which is caused by a rapid decrease in the supply and injection pressure, as well as the deposition of the powder fire extinguishing agent in the transport pipeline, thereby ensuring the rate of injection of the powder fire extinguishing agent.

In addition, the large amount of nitrogen introduced by increasing the amount of incoming gas can reduce the oxygen content in the air around the fire site and has an obvious positive value in preventing fires and reducing the effect of explosions, thereby increasing the overall fire fighting efficiency of firefighters. Vehicle.

Brief Description of Drawings

The accompanying drawings, forming a part of this description, illustrate embodiments of the present invention and together with this description serve to explain the principles of the present invention.

In view of the accompanying drawings and in accordance with the following detailed description, the present invention may be more fully understood in which:

fig. 1 is a schematic diagram of the structure of some embodiments of a powder extinguishing agent supply and injection system in accordance with the present invention; and FIG. 2 is a schematic diagram of the structure of other embodiments of a powder extinguishing agent supply and injection system in accordance with the present invention.

In the accompanying drawings, reference numbers and related terms are as follows:

- high pressure gas source, 2 - high pressure ball valve, 3 - pressure gauge, 4 - first pressure reducing valve, 4B - second pressure reducing valve, 5 - third switching valve, 6 - powder extinguishing agent outlet valve, 7 - first switching valve, 7B - second switching valve, 8 - powder fire extinguishing agent container, 9 exhaust valve, 10 - powder fire monitor on top of the container, 11 - safety valve, 12 - powder fire extinguishing agent blower switching valve, 13 - rotating loading / unloading housing between the top of the frame and the chassis, 14 - telescopic pull-out arm / ladder, 15 - powder fire monitor at the top of the manipulator / ladder, 16 - powder fire nozzle, 17 - cylindrical reel for powder extinguishing agent, 18 - controller, 19 - pressure sensor ...

It should be noted that the dimensions of each part shown in the indicated accompanying drawings do not represent actual proportional fit. In addition, the same or similar reference numbers represent the same or similar components.

Detailed description

Exemplary embodiments of the present invention are described in detail below with reference to the aforementioned accompanying drawings. The description of these exemplary embodiments is illustrative only and in no way represents any limitation with respect to the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are offered in order to make the present disclosure complete and exhaustive, and in order to fully express the scope of the present invention to those skilled in the art. It should be noted that, unless otherwise indicated, the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values illustrated in these embodiments are to be construed as exemplary only and should not be construed as limiting.

The words first, second and other similar words do not mean any order, quantity or importance, but are only intended to distinguish different details. The words include or contain and other similar words mean that the elements specified before such a word cover the elements listed after the specified word, but do not exclude the possibility of including other elements. The words up, down, left, right and the like are used only to indicate a relative relationship with a location. When the absolute location of the object being described changes, the specified relative relationship to the location may also change accordingly.

In the present invention, when a specific device is described to be located between a first and a second device, an intermediate device may or may not be present between the specified device and the specified first or specified second device. When it is described that a specific device is connected to another device, then the specified specific device may be directly connected to the specified other device and may not have the specified intermediate device, and also may not be directly connected to the specified other device and may have the specified intermediate device.

All terms used in this disclosure (including technical terms or scientific terms) have the same meaning as terms used by those of ordinary skill in the art to which this disclosure relates, unless otherwise specifically defined. It should be borne in mind that terms defined, for example, in a general vocabulary should be interpreted as having meanings corresponding to those in the context of the prior art, and should not be interpreted in an idealized or highly formal sense unless explicitly defined. form in this document.

The technologies, methods and equipment known to those skilled in the prior art may not be discussed in detail, but if necessary, these technologies, methods and equipment should be considered as part of this description.

FIG. 1 is a schematic diagram of the structure of some embodiments of a powder extinguishing agent supply and injection system in accordance with the present invention. FIG. 2 is a schematic diagram of the structure of other embodiments of a powder extinguishing agent supply and injection system in accordance with the present invention. With reference to FIG. 1 and 2, in some embodiments, said powder extinguishing agent supply and injection system includes: a high pressure gas source 1, a powder extinguishing agent container 8, a powder extinguishing agent blower, a first pressure reducing valve 4, and a flow balancing unit. The specified container 8 for powder extinguishing agent has an inlet for gas and an outlet for powder extinguishing agent, and the specified gas inlet communicates with the specified source 1 of high pressure gas. The specified blower of powder fire extinguishing agent communicates with the specified outlet for the powder fire extinguishing agent. Said first pressure reducing valve 4 is fluidly connected between said gas inlet and high pressure gas source 1. The specified flow balancing unit is located between the specified source 1 of high pressure gas and the specified container 8 for powder extinguishing agent and provides a flow capacity through the specified gas inlet equal to the flow capacity through the outlet for powder extinguishing agent, by controlling the amount of incoming gas from the specified source 1 of high pressure gas to the specified container 8 for powder fire extinguishing agent.

In the existing system of supply and injection of a powder extinguishing agent, to ensure complete fluidization of the specified powder extinguishing agent in the specified container 8 for the powder extinguishing agent and the injection rate of the specified blower of the powder extinguishing agent, the diameter of the specified gas inlet of the specified container 8 is less than the diameter of the specified outlet of the powder extinguishing agent , and the ratio of the diameter of the specified gas inlet to the diameter of the specified outlet of the powder extinguishing agent is 0.2-0.4. After fluidization of the powder extinguishing agent, the amount of the incoming gas is much less than the amount of the gas-powder extinguishing agent injected during feeding and pumping, therefore, the pressure in the specified container 8 for the powder extinguishing agent decreases rapidly.

In this regard, an embodiment of the present invention proposes a flow balancing unit, ensuring that the pressure in said container 8 for a powder extinguishing agent is maintained practically unchanged during the supply and injection process by adjusting and controlling the balance of the capacity of the container 8 through the inlet and outlet during the supply and injection process. on the basis of maintaining the initial fluidization process of said powder extinguishing agent unchanged, thereby solving the problem that the existing system for supplying and pumping a powder extinguishing agent tends to lack the injection pressure at a later stage due to injection under reduced pressure.

In accordance with an embodiment of the present invention, said discharge pressure of the gas-powder extinguishing agent is stabilized by the said flow balancing unit, the discharge rate of the powder extinguishing agent from said container 8 for the powder extinguishing agent is actually increased, and the deposition of the powder extinguishing agent in the transport pipeline is reduced, which provides the injection rate of the specified powder fire extinguishing agent and the fire-fighting efficiency of fire-fighting vehicles.

In addition, in this embodiment of the present invention, the amount of inlet gas is increased by the flow balancing unit in the supply and injection process, and there is no need to change the maturation process in the fluidization process and improve the design of said powder fire extinguishing agent tank 8, powder extinguishing agent blower and transportation pipeline; therefore, the existing system of supply and injection of powder extinguishing agent can be conveniently and inexpensively improved and transformed, and high applicability and popularizing work results can be achieved.

In some embodiments, the implementation of the specified first pressure reducing valve 4 is an electrical proportional pressure reducing valve. The specified flow balancing unit additionally includes: a timer and a pressure sensor 19. The specified timer is configured to record the time of supply and discharge of the specified container 8 for a powder fire extinguishing agent. The specified pressure sensor 19 is configured to measure the current pressure in the specified container 8 for a powder fire extinguishing agent. Said electrical proportional pressure reducing valve is in communication with said timer and pressure transducer 19, and the outlet pressure of said electric proportional decreasing pressure valve is adjusted in accordance with the indicated delivery time

- 5 038911 and discharge and indicated current pressure.

If pressure is a key parameter in said powder extinguishing agent supply and injection system, then the pressure in said powder extinguishing agent container 8 can be flexibly and timely adjusted by measuring said pressure in said container 8 and using said first pressure-controlled pressure reducing valve.

In addition, given that the pressure in said powder fire extinguishing agent container 8 changes over time of supply and discharge along with continuous supply and discharge of said powder extinguishing agent, the outlet pressure of said electric proportional pressure reducing valve can be controlled in accordance with the change rule , according to which the current pressure changes with the time of supply and discharge in the process of supply and discharge, thereby increasing the amount of incoming gas in the specified container 8 for the powder extinguishing agent.

In some embodiments, the implementation of the specified outlet pressure of the specified electric proportional pressure reducing valve is set equal to or less than the first pressure value when the specified container 8 for powder extinguishing agent is in a fluidized state; and said outlet pressure of said electric proportional pressure reducing valve is set equal to the second pressure value when said powder fire extinguishing agent container 8 is in a supply and pumping state. The specified second pressure value is greater than or equal to the specified first pressure value.

In some embodiments, the implementation of the specified first pressure value is calculated by subtracting 0.1-0.2 MPa from the maximum operating pressure of the specified container 8 for powder extinguishing agent, and the specified second pressure value is calculated as a variable function of the specified current pressure and the specified delivery and injection times. The specified current pressure does not exceed the value of the difference obtained by subtracting 0.1-0.3 MPa from the specified first pressure value.

When said powder fire extinguishing agent container 8 is filled in a fluidized state, said outlet pressure of said electric proportional pressure reducing valve does not exceed the maximum operating pressure of said powder container 8, thereby ensuring the safe operation of said powder fire extinguishing agent container 8. To further increase safety, the specified pressure can be reduced by 0.1-0.2 MPa, taking into account the maximum working pressure of the specified container 8, in order to form the design working pressure of the specified container 8 for the powder fire extinguishing agent.

After the transition of the specified container 8 for the powder fire extinguishing agent in the state of supply and injection, the main task of the specified electric proportional pressure reducing valve is to maintain the current pressure in the container 8 for the powder fire extinguishing agent at the level of the design working pressure of the specified container 8; in addition, so that the current pressure does not exceed the design working pressure, the specified pressure can be reduced by 0.1-0.3 MPa, taking into account the design working pressure.

In order for the current pressure to remain within a predetermined range, in some embodiments, the outlet pressure of the specified electric proportional pressure reducing valve is set to decrease when the specified current pressure is equal to the value of the difference obtained by subtracting 0.1 to 0.3 MPa from the specified first pressure value.

Adjusting the pressure in the powder fire extinguishing agent container 8 can indirectly take the flow rate as a control factor. In some embodiments, the implementation of the specified first pressure reducing valve 4 is an electrical proportional pressure reducing valve. The flow balancing unit additionally includes: a first flow rate meter and a second flow rate meter. The specified first flow rate meter is configured to measure the first current throughput of the gas inlet. The specified second flow rate meter is configured to measure the second current throughput of the outlet for the powder extinguishing agent. Said electrical proportional pressure reducing valve is in communication with said first flow rate meter and said second flow rate meter. The degree of opening of said electric proportional pressure reducing valve is controlled in accordance with said first current flow rate and said second current flow rate.

After the powder fire extinguishing agent container is properly filled and fluidized, it is possible to directly determine whether said powder fire extinguishing agent container 8 is in a capacity balance state according to the measurements of said first and second flow rate meters. Therefore, the change in pressure in the specified container 8 can be determined by the throughput provided that the pressure in the container 8 for the powder extinguishing agent at the initial injection meets the requirements.

- 6 038911

To ensure that the pressure in the container 8 for powder extinguishing agent is within the specified range during the entire time of the supply and discharge state, the specified pressure in the container 8 can be additionally measured to ensure accurate control of the supply and injection system of powder extinguishing agent with a throughput that serves as an indirect control factor.

In some embodiments, the implementation of the specified degree of opening of the electric proportional pressure reducing valve decreases when the specified first current flow rate is greater than the specified second current flow rate, and increases when the specified first current flow rate is less than the specified second current flow rate, such that the specified second current flow rate is in the specified bandwidth range.

With reference to FIG. 2, said flow balancing unit includes a second pressure reducing valve 4B. Said second pressure reducing valve 4B is fluidly connected between the gas inlet and the high pressure source 1, and is connected to said first pressure reducing valve 4 in parallel.

To the original supply gas pipeline, a parallel supply gas pipeline is added between said container 8 for powder extinguishing agent and said source 1 of high pressure gas, and the pressure is regulated by said second pressure reducing valve 4B in said parallel gas pipeline, so that the newly added gas pipeline is equal to the requirements of said container 8 by the pressure of the supplied gas.

To ensure that the powder fire extinguishing agent tank 8 continues to operate within a safe pressure range and the volume of supplied gas required for said tank 8 in a supply and discharge state is greater than the volume of supplied gas required for said tank 8 in a fluidized state, in some embodiments implementation, the outlet pressure of the specified first lowering pressure valve 4 and the outlet pressure of the specified second lowering pressure valve 4B are set at a level not exceeding the value of the difference obtained by subtracting 0.1-0.2 MPa from the maximum operating pressure of the specified container 8 for powder fire extinguishing agent and the flow rate at the outlet of said second pressure reducing valve 4B is set to be higher than the flow rate at the outlet of said first pressure reducing valve 4.

In order to be able to adjust the feed gas throughput of said high pressure gas source 1 to the powder extinguishing agent container 8, in some embodiments, said flow balancing unit further includes: a first changeover valve 7 and a second changeover valve 7B. The specified first changeover valve 7 is located between the specified first pressure reducing valve 4 and the gas inlet. The specified second switching valve is located between the specified second pressure reducing valve 4B and the gas inlet. Said first switching valve 7 is open when said powder container 8 is in a fluidized state and said second switching valve 7B is closed when said powder container 8 is in a fluidized state. Both said first switching valve 7 and said second switching valve 7B are open when said powder container 8 is in the supply and pumping state.

In some embodiments, the implementation of the specified container 8 for powder extinguishing agent has an exhaust port. The specified system for supplying and pumping a powder extinguishing agent further includes: a third switching valve 5, an exhaust valve 9 and a filtering device. Said third switching valve 5 is located between said first pressure reducing valve 4 and the powder blower and serves as a control valve on the blowdown line of said powder blower to control the purging process by opening and closing said third switching valve 5. Said exhaust valve 9 positioned between said outlet of said powder fire extinguishing agent container 8 and an external environment for controlling connection and disconnection between said outlet and the external environment. The specified filtering device is located between the specified exhaust valve 9 and the exhaust port.

An embodiment of the present invention provides a hoist fire engine including said powder extinguishing agent supply and injection system according to any of the above embodiments.

Thus, in accordance with said powder fire extinguishing agent supply and injection system and said elevator fire engine provided in an embodiment of the present invention, the pressure in the powder fire extinguishing agent container 8 is kept stable during the injection process, and the problem that the existing the powder extinguishing agent supply and injection system has a tendency to insufficient injection pressure at a later stage due to injection under reduced pressure, it is solved.

In addition, in the embodiment of the present invention, an increase in the amount of inlet gas in the process of supplying and pumping does not affect the maturation process on the process of fluidizing the flow, provides the supply and discharge pressure of the specified container 8 for the powder extinguishing agent, increases the rate of injection of the powder extinguishing agent and the productivity the specified container 8 for a powder fire extinguishing agent, and also allows you to avoid a decrease in the feed rate of a gas-powder fire extinguishing agent, which is caused by a rapid decrease in the supply and injection pressure, as well as the deposition of a powder fire extinguishing agent in the transport pipeline, thereby ensuring the rate of injection of the powder fire extinguishing agent.

In addition, the large amount of nitrogen introduced by increasing the amount of gas entering can reduce the oxygen content in the air around the fire site and has obvious positive benefits in preventing fires and reducing the effect of explosions, thereby increasing the overall fire fighting efficiency of fire fighting vehicles.

One embodiment of said powder extinguishing agent supply and injection system in accordance with the present invention is described below with reference to FIG. 1 and 2.

The powder extinguishing agent blower includes a powder fire monitor 15 on the top of the manipulator / ladder, a powder fire barrel 16 and a powder fire monitor 10 on the top of the vessel. The specified powder fire monitor 15 on the upper part of the manipulator / ladder communicates with the outlet of the powder extinguishing agent of the container 8 for the powder extinguishing agent through the telescopic retractable manipulator / ladder 14, the rotating body 13 of loading and unloading between the upper part of the frame and the chassis and the switching valve 12 of the powder blower fire extinguishing agent. The specified powder fire nozzle 16 communicates with the outlet of the powder fire extinguishing agent of the container 8 for the powder fire extinguishing agent through the cylindrical coil 17 for the powder fire extinguishing agent and the switching valve 12 of the powder fire extinguishing agent blower, and the specified powder fire monitor 10 on the top of the container directly communicates with the outlet of the powder fire extinguishing agent substances of the container 8 for the powder extinguishing agent through the switching valve 12 of the blower of the powder extinguishing agent.

Said third switching valve 5 is located between the high pressure gas source 1 and said powder fire monitor 15 on the top of the manipulator / ladder, between said high pressure gas source 1 and said powder fire nozzle 16, and also between said high pressure gas source 1 and said powder fire monitor 10 on the top of the vessel, and can control the specified source 1 of high pressure gas to purge the specified blower of powder extinguishing agent.

The controller 18 is in communication with a pressure sensor 19 and an electrically proportional pressure reducing valve. It should be noted that said controller 18 may serve as an intermediate part of a communication connection to obtain a signal conversion and transmission function, and said electrical proportional pressure reducing valve may respond to a signal from said controller 18 or directly respond to a signal from said pressure sensor 19 to control the degree of opening of said electrical proportional pressure reducing valve.

So far, embodiments of the present invention have been described in detail. In order not to obscure the principles of the present invention, some details known in the art are not described. Specialists in this field can fully understand how to implement the technical solution disclosed in this document, in accordance with the above description.

While some specific embodiments of the present invention have been illustrated in detail using examples, those skilled in the art should keep in mind that the above examples are intended to be illustrative only and not to limit the scope of the present invention. Specialists in this field should take into account that the above options for implementation may be changed or part of the technical features may be equivalently replaced without departing from the scope and essence of the present invention. The scope of the present invention is defined by the appended claims.

Claims (12)

1. The system of supply and injection of powder fire extinguishing agent, containing: a source of (1) high pressure gas; a container (8) for a powder extinguishing agent having an inlet for a gas and an outlet for a powder extinguishing agent, and said inlet for a gas communicates with said source (1) of a high pressure gas; a powder extinguishing agent blower, which communicates with the specified outlet for - 8 038911 powder fire extinguishing agent; a first pressure reducing valve (4) fluidly connected between said gas inlet and a high pressure gas source (1); and a flow balancing unit located between said high pressure gas source (1) and said powder extinguishing agent container (8) to provide a flow rate through said gas inlet equal to the flow rate through the powder extinguishing agent outlet, by controlling the amount of incoming gas from said high pressure gas source (1) to said powder extinguishing agent container (8). 2. A powder extinguishing agent supply and injection system according to claim 1, wherein said first pressure reducing valve (4) is an electrical proportional pressure reducing valve, and said flow balancing unit comprises: a timer configured to record the time of supply and discharge of said container (8) for a powder extinguishing agent; a pressure sensor (19) configured to measure the current pressure in said container (8) for a powder extinguishing agent; and wherein said electrical proportional pressure reducing valve is in communication with said timer and pressure sensor (19), and the outlet pressure of said electrical proportional decreasing pressure valve is controlled in accordance with said delivery and delivery times and said current pressure. 3. The powder extinguishing agent supply and injection system according to claim 2, wherein said outlet pressure of the electric proportional pressure reducing valve is set equal to or less than the first pressure value when the powder extinguishing agent container (8) is in a fluidized state; and said outlet pressure of the electric proportional pressure reducing valve is set equal to the second pressure value when the powder extinguishing agent container (8) is in a supply and discharge state in which said second pressure value is greater than or equal to said first pressure value. 4. The system for supplying and pumping a powder extinguishing agent according to claim 3, in which said first pressure value is calculated by subtracting 0.1-0.2 MPa from the maximum working pressure of said container (8) for a powder extinguishing agent, said second pressure value is calculated by a variable function of the specified current pressure and the specified time of supply and injection, and the specified current pressure does not exceed the value of the difference obtained by subtracting 0.1-0.3 MPa from the specified first pressure value. 5. The powder extinguishing agent supply and injection system according to claim 4, wherein said outlet pressure of the electric proportional pressure reducing valve is set such that it decreases when said current pressure is equal to the value of the difference obtained by subtracting 0.1-0.3 MPa from the specified first pressure value. 6. The powder extinguishing agent supply and injection system according to claim 1, wherein said first pressure reducing valve (4) is an electrical proportional pressure reducing valve, and said flow balancing unit further includes: a first flow rate meter configured to measure a first current flow rate of the gas inlet; a second flow rate meter configured to measure a second current flow rate of the powder extinguishing agent outlet; and wherein said electrical proportional pressure reducing valve is in communication with said first flow rate meter and said second flow rate meter, and the degree of opening of said electrical proportional pressure reducing valve is adjusted in accordance with said first current flow rate and said second current flow rate ... 7. The powder extinguishing agent supply and injection system of claim 6, wherein said opening degree of the electrical proportional pressure reducing valve decreases when said first current flow rate is greater than said second current flow rate, and increases when said first current flow rate is less than said second current bandwidth, so that the specified second current bandwidth is in the specified bandwidth range. 8. The powder extinguishing agent supply and injection system according to claim 1, wherein said flow balancing unit comprises: a second pressure reducing valve (4B) fluidly connected between said gas inlet and a high pressure gas source (1) and connected to the specified first pressure reducing valve (4) in parallel. 9. The powder extinguishing agent supply and injection system according to claim 8, wherein said outlet pressure of said first pressure reducing valve (4) and said outlet pressure of said second pressure reducing valve (4B) are set so that they are not higher than - 9 038911 the difference from subtracting 0.1-0.2 MPa from the maximum working pressure of the specified container (8) for the powder extinguishing agent, and the throughput at the outlet of the specified second pressure reducing valve (4B) is set so that it is higher than the throughput said first pressure reducing valve (4). 10. The system for supplying and pumping a powder extinguishing agent according to claim 9, wherein said flow balancing unit further comprises: a first switching valve (7) located between said first pressure reducing valve (4) and a gas inlet; a second switching valve (7B) located between said second pressure reducing valve (4B) and the gas inlet; and wherein said first switching valve (7) is open when said powder extinguishing agent container (8) is in a fluidized state and said second switching valve (7B) is closed when said powder extinguishing agent container is in a fluidized state; and said first switching valve (7) and said second switching valve (7B) are open when said powder extinguishing agent container (8) is in the supply and pumping state. 11. The system for supplying and pumping a powder extinguishing agent according to claim 1, in which said container (8) for a powder extinguishing agent has an exhaust port, and said system for supplying and pumping a powder extinguishing agent further comprises: a third switching valve (5) located between said first pressure reducing valve (4) and a powder extinguishing agent blower; an exhaust valve (9) located between the specified exhaust port and the external environment; and a filtering device located between said exhaust valve (9) and an exhaust port. 12. Fire engine with a lift, containing the specified supply and injection of a powder extinguishing agent in accordance with any of claims 1-11.