CN110870960A - Dry powder spraying system and elevating fire truck - Google Patents
Dry powder spraying system and elevating fire truck Download PDFInfo
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- CN110870960A CN110870960A CN201911321471.1A CN201911321471A CN110870960A CN 110870960 A CN110870960 A CN 110870960A CN 201911321471 A CN201911321471 A CN 201911321471A CN 110870960 A CN110870960 A CN 110870960A
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- 239000000843 powder Substances 0.000 title claims abstract description 231
- 238000005507 spraying Methods 0.000 title claims abstract description 70
- 230000003028 elevating effect Effects 0.000 title description 11
- 238000005243 fluidization Methods 0.000 claims description 12
- 230000001965 increasing effect Effects 0.000 claims description 9
- 239000007921 spray Substances 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 28
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 229940098458 powder spray Drugs 0.000 abstract description 5
- 238000007664 blowing Methods 0.000 abstract description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 11
- 230000001276 controlling effect Effects 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 239000007789 gas Substances 0.000 description 6
- 230000005514 two-phase flow Effects 0.000 description 5
- 238000010926 purge Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000012885 constant function Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C27/00—Fire-fighting land vehicles
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/005—Delivery of fire-extinguishing material using nozzles
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C35/00—Permanently-installed equipment
- A62C35/02—Permanently-installed equipment with containers for delivering the extinguishing substance
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
- A62C37/40—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone with electric connection between sensor and actuator
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- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Nozzles (AREA)
Abstract
The present disclosure relates to a dry powder spray delivery system, comprising: a high pressure gas source; the dry powder tank comprises an air inlet and a powder outlet, and the air inlet is communicated with the high-pressure air source; the dry powder ejector is communicated with the powder outlet; the first pressure reducing valve is connected between the air inlet and the high-pressure air source; and the flow balance assembly is arranged between the high-pressure air source and the dry powder tank, and can make the flow passing through the air inlet and the powder outlet identical by controlling the air inflow from the high-pressure air source to the dry powder tank. Therefore, according to the dry powder spraying system that this application embodiment provided, can realize that the blowing pressure of dry powder jar keeps stable in the injection process, solve current dry powder spraying system and lead to easily appearing lifting the difficult problem that the pressure is not enough that spouts in the later stage of spouting because of the step-down spraying.
Description
Technical Field
The utility model relates to a fire control unit field especially relates to a dry powder spraying system and elevating fire engine.
Background
The dry powder spraying system is a working device which adopts inert gas such as nitrogen and the like as driving gas, fluidizes dry powder stored in a dry powder tank, conveys the fluidized dry powder to a dry powder gun or a dry powder gun through a conveying pipeline, and finally sprays the fluidized dry powder from the dry powder gun or the dry powder gun, and the main working process of the dry powder spraying system comprises the following steps of ① inflating the dry powder tank by a high-pressure gas storage bottle, fluidizing the dry powder in the dry powder tank under a set pressure, ② opening a dry powder tank outlet valve to enable a dry powder-nitrogen two-phase flow to enter the conveying pipeline, and ③ supplying the dry powder-nitrogen two-phase flow to a dry powder sprayer to spray and spray the dry powder-nitrogen two-phase flow to a.
In the above working process, the pressure is one of the core parameters of the dry powder spraying system, specifically, the rated working pressure of the dry powder tank needs to be considered in the above step ①, the on-way pressure loss and the local pressure loss of the dry powder-nitrogen two-phase flow in the delivery pipeline need to be considered in the above step ②, and the head pressure loss caused by the lifting condition of the dry powder sprayer needs to be considered in the above step ③.
Further considering the sequence relationship between the above steps, the final dry powder discharge pressure is obtained through the pressure loss in steps ②, ③ based on the rated working pressure of the dry powder tank in step ①.
Furthermore, considering that the flow area of the air inlet of the dry powder tank is often smaller than that of the powder outlet, the pressure of the dry powder tank in step ② will decrease rapidly with the spraying process, so the rated working pressure of the dry powder tank related to step ① needs to reserve enough pressure reserve to deal with the rapid pressure decay during the spraying process.
Theoretically, if the inflation pressure of the air storage bottle to the dry powder tank can be increased, so that the dry powder spraying system obtains a high enough initial pressure in step ①, the pressure loss in the subsequent steps can be well dealt with, enough pressure reserves are reserved, and finally enough spraying pressure is obtained.
It can be seen that the spray pressure, the pipeline length and the lifting condition of the existing dry powder spray delivery system are all limited by the rated working pressure of the dry powder tank. Especially for a lifting fire truck with a large lifting height, the height difference of the conveying pipelines is large, the distance is long, and more prominent head pressure loss and pipeline pressure loss can be brought.
Therefore, when the existing elevating fire truck, especially the elevating fire truck with a large elevating height, is used for elevating and spraying, along with the rapid attenuation of the spraying pressure, the problem of serious insufficient spraying pressure is often generated in the later period of spraying. And with the reduction of the injection pressure, the conveying speed of the dry powder-nitrogen two-phase flow is also reduced remarkably, which can cause the dry powder in the conveying pipeline to be settled, further reduce the powder outlet efficiency of the dry powder tank and finally cause the dry powder residual rate of the dry powder tank to be higher after the injection is finished, therefore, the existing dry powder injection system is also provided with a purging pipeline for cleaning the dry powder deposition in the pipeline after the injection is finished.
Disclosure of Invention
In view of this, the embodiment of the present disclosure provides a dry powder spraying system, which can keep the blowing pressure of a dry powder tank stable in the spraying process, and solve the problem that the lifting spraying pressure is insufficient in the later stage of spraying due to the reduced pressure spraying of the existing dry powder spraying system.
In one aspect of the present disclosure, there is provided a dry powder spray delivery system comprising:
a high pressure gas source;
the dry powder tank comprises an air inlet and a powder outlet, and the air inlet is communicated with a high-pressure air source;
the dry powder ejector is communicated with the powder outlet;
the first pressure reducing valve is connected between the air inlet and the high-pressure air source; and
and the flow balance assembly is arranged between the high-pressure air source and the dry powder tank, and can make the flow passing through the air inlet and the powder outlet identical by controlling the air inflow from the high-pressure air source to the dry powder tank.
In some embodiments, the first pressure reducing valve is an electro-proportional pressure reducing valve, and the flow balancing assembly comprises:
the timer is used for recording the spraying time of the dry powder tank; and
the pressure sensor is used for measuring the real-time pressure in the dry powder tank;
wherein the electro-proportional pressure reducing valve is communicatively coupled to the timer and the pressure sensor and configured to: and adjusting the outlet pressure of the electro-proportional pressure reducing valve according to the spraying time and the real-time pressure.
In some embodiments, the electro-proportional pressure reducing valve is further configured to:
when the dry powder tank is in a fluidization state, controlling the outlet pressure of the dry powder tank to be less than or equal to a first pressure value; and
when the dry powder tank is in a spraying state, controlling the outlet pressure of the dry powder tank to be equal to a second pressure value;
and the second pressure value is greater than or equal to the first pressure value.
In some embodiments, the first pressure value is a constant function of the maximum working pressure of the dry powder tank minus 0.1-0.2 MPa, and the second pressure value is a variable function of the real-time pressure and the spraying time, so that the real-time pressure is not greater than the first set pressure minus 0.1-0.3 MPa.
In some embodiments, the electro-proportional pressure reducing valve is further configured to:
and when the real-time pressure is equal to the first set pressure minus 0.1-0.3 MPa, reducing the outlet pressure of the electric proportional pressure reducing valve.
In some embodiments, the first pressure reducing valve is an electro-proportional pressure reducing valve, the flow balancing assembly further comprising:
the first flowmeter is used for measuring a first real-time flow of the air inlet; and
the second flowmeter is used for measuring the second real-time flow of the powder outlet;
wherein the electro proportional pressure reducing valve is communicatively connected to the first flow meter and the second flow meter and configured to: and adjusting the opening of the electric proportional pressure reducing valve according to the first real-time flow and the second real-time flow.
In some embodiments, the electro-proportional pressure reducing valve is further configured to: when the first real-time flow is larger than the second real-time flow, the opening degree of the electric proportional pressure reducing valve is reduced, and when the first real-time flow is smaller than the second real-time flow, the opening degree of the electric proportional pressure reducing valve is increased, so that the second real-time flow is in a set flow interval.
In some embodiments, the flow balancing assembly comprises:
and the second pressure reducing valve is connected between the air inlet and the high-pressure air source and is connected with the first pressure reducing valve in parallel.
In some embodiments, the outlet pressure of the first pressure reducing valve and the second pressure reducing valve is set to be not more than the maximum working pressure of the dry powder tank minus 0.1 to 0.2MPa, and the outlet flow rate of the second pressure reducing valve is set to be greater than the outlet flow rate of the first pressure reducing valve.
In some embodiments, the flow balancing assembly further comprises:
the first switch valve is arranged between the first reducing valve and the air inlet; and
the second switch valve is arranged between the second reducing valve and the air inlet;
wherein the first and second pressure relief valves are configured to: when the dry powder tank is in a fluidization state, opening the first switch valve and closing the second switch valve; when the dry powder tank is in a spraying state, the first switch valve and the second switch valve are opened.
In some embodiments, the dry powder canister further comprises an exhaust port, and the dry powder delivery system further comprises:
the third switch valve is arranged between the first reducing valve and the dry powder ejector;
the exhaust valve is arranged between the exhaust port of the dry powder tank and the external environment; and
and the filtering device is arranged between the exhaust valve and the exhaust port.
In another aspect of the present disclosure, an elevated fire engine is provided, including a dry powder dispensing system as in any of the preceding embodiments.
Therefore, according to the dry powder spraying system and the elevating fire truck provided by the embodiment of the disclosure, the blowing pressure of the dry powder tank can be kept stable in the spraying process, and the problem that the elevating spraying pressure is insufficient in the later stage of spraying due to the depressurization spraying of the conventional dry powder spraying system is solved.
And this disclosure through the method that increases the air input in the process of spouting, neither influence the flow fluidization process that has ripe technology, guaranteed the spouting pressure of dry powder jar through increasing the air input of spouting again, improved the powder injection rate of dry powder and the powder efficiency of dry powder jar, avoid leading to the reduction of gas powder conveying speed because of the rapid decay of spouting pressure to and transport the dry powder settlement in the pipeline, and then guaranteed the jet velocity of dry powder.
In addition, the nitrogen which is sprayed in a large amount and provided by the method for increasing the air input can also reduce the oxygen content of the air around the fire scene, which has significant positive significance for fire prevention and explosion suppression, thereby improving the comprehensive fire extinguishing efficiency of the fire-fighting vehicle.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.
The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:
fig. 1 is a schematic structural view of a dry powder dispensing system according to some embodiments of the present disclosure;
FIG. 2 is a schematic structural view of a dry powder dispensing system according to further embodiments of the present disclosure;
in the figure:
1. the high-pressure dry powder spraying device comprises a high-pressure air source, 2, a high-pressure ball valve, 3, a pressure gauge, 4, a first pressure reducing valve, 4B, a second pressure reducing valve, 5, a third switch valve, 6, a dry powder tank outlet valve, 7, a first switch valve, 7B, a second switch valve, 8, a dry powder tank, 9, an exhaust valve, 10, a tank top dry powder gun, 11, a safety valve, 12, a dry powder sprayer switch valve, 13, an on-off turning body, 14, a telescopic arm/ladder, 15, an arm/ladder top dry powder gun, 16, a dry powder gun, 17, a dry powder pipe winding drum, 18, a controller, 19 and a pressure sensor.
It should be understood that the dimensions of the various parts shown in the figures are not drawn to scale. Further, the same or similar reference numerals denote the same or similar components.
Detailed Description
Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.
The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.
In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, the particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.
All terms including technical or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs unless specifically defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
As shown in FIGS. 1-2:
in one aspect of the present disclosure, there is provided a dry powder spray delivery system comprising:
a high-pressure gas source 1;
the dry powder tank 8 comprises an air inlet and a powder outlet, and the air inlet is communicated with the high-pressure air source 1;
the dry powder ejector is communicated with the powder outlet;
the first pressure reducing valve 4 is connected between the air inlet and the high-pressure air source 1; and
and the flow balance assembly is arranged between the high-pressure air source 1 and the dry powder tank 8, and can make the flow passing through the air inlet and the powder outlet identical by controlling the air inflow from the high-pressure air source 1 to the dry powder tank 8.
In the conventional dry powder spraying system, in order to ensure the sufficiency of the dry powder fluidization process in the dry powder tank 8 and the spraying rate of the dry powder sprayer, the drift diameter of an air inlet of the dry powder tank 8 is usually smaller than that of a powder outlet, and the drift diameter ratio of the air inlet is usually 0.2-0.4. After the dry powder is fluidized, the pressure in the dry powder tank 8 will be rapidly reduced because the air intake amount is much smaller than the air powder ejection amount.
In view of the above, the flow balance assembly is arranged in the present disclosure, and on the basis of keeping the original dry powder fluidization process unchanged, the pressure in the dry powder tank 8 is kept unchanged in the spraying process only by regulating and controlling the flow balance of the inlet and the outlet of the dry powder tank 8. Therefore, the problem that the spraying pressure is insufficient in the later spraying period caused by reduced pressure spraying in the conventional dry powder spraying system is solved.
This openly stabilizes the jet pressure of gas powder through flow balance subassembly, can effectively improve the play powder efficiency of dry powder jar 8, reduce the dry powder settlement in the transport pipeline, and then guaranteed the jet velocity and the vehicle efficiency of putting out a fire of dry powder.
In addition, this application only increases the air input through flow balance subassembly at the spraying process, guarantees that the ripe process flow of fluidization process is unchangeable, and need not to carry out institutional advancement to dry powder jar 8, dry powder sprayer and transport pipeline, can strengthen and reform transform current dry powder spraying system more conveniently and low-cost, has better suitability and popularization nature.
Further, in some embodiments, the first pressure reducing valve 4 is an electro-proportional pressure reducing valve, and the flow balancing assembly includes:
a timer for recording the spray time of the dry powder tank 8; and
a pressure sensor 19 for measuring the real-time pressure in the dry powder tank 8;
wherein the electro proportional pressure reducing valve is communicatively connected to the timer and the pressure sensor 19 and configured to: and adjusting the outlet pressure of the electro-proportional pressure reducing valve according to the spraying time and the real-time pressure.
When the pressure is a key parameter in the dry powder spraying system, the pressure in the dry powder tank 8 can be flexibly and timely adjusted by measuring the pressure in the dry powder tank 8 and selecting the first pressurization valve with adjustable pressure.
In addition, considering that the pressure in the dry powder tank 8 changes along with the spraying time as the dry powder spraying continues, the outlet pressure of the electro-proportional pressure reducing valve can be controlled according to the change rule of the real-time pressure along with the spraying time in the spraying process to increase the air inflow of the dry powder tank 8.
Further, in some embodiments, the electro-proportional pressure reducing valve is further configured to:
when the dry powder tank 8 is in a fluidization state, controlling the outlet pressure of the dry powder tank to be less than or equal to a first pressure value; and
when the dry powder tank 8 is in a spraying state, controlling the outlet pressure of the dry powder tank to be equal to a second pressure value;
and the second pressure value is greater than or equal to the first pressure value.
Further, in some embodiments, the first pressure value is a constant function of the maximum working pressure of the dry powder tank 8 minus 0.1-0.2 MPa, and the second pressure value is a variable function of the real-time pressure and the spraying time, so that the real-time pressure is not greater than the first set pressure minus 0.1-0.3 MPa.
When the dry powder tank 8 is aerated in a fluidized state, the outlet pressure of the electro-proportional pressure reducing valve should be controlled not to exceed the maximum working pressure of the dry powder tank 8 so as to ensure the working safety of the dry powder tank 8. Of course, in order to further improve the safety, the pressure of 0.1-0.2 MPa may be reduced on the basis of the maximum working pressure of the dry powder tank 8 to form the rated working pressure of the dry powder tank 8.
And after the dry powder tank 8 is in a spraying state, the core control target of the electric proportional pressure reducing valve is to enable the real-time pressure in the dry powder tank 8 to be maintained at the level of the rated working pressure of the dry powder tank 8, and in order to ensure that the real-time pressure does not exceed the rated working pressure, the real-time pressure can be reduced by 0.1-0.3 MPa on the basis of the rated working pressure.
Further, in order to keep the real-time pressure always within the predetermined interval, in some embodiments, the electro-proportional pressure reducing valve is further configured to:
and when the real-time pressure is equal to the first set pressure minus 0.1-0.3 MPa, reducing the outlet pressure of the electric proportional pressure reducing valve.
Further, the pressure adjustment of the dry powder tank 8 may also indirectly use the flow rate as a control factor, and in some embodiments, the first pressure reducing valve 4 is an electro-proportional pressure reducing valve, and the flow balancing assembly further comprises:
the first flowmeter is used for measuring a first real-time flow of the air inlet; and
the second flowmeter is used for measuring the second real-time flow of the powder outlet;
wherein the electro proportional pressure reducing valve is communicatively connected to the first flow meter and the second flow meter and configured to: and adjusting the opening of the electric proportional pressure reducing valve according to the first real-time flow and the second real-time flow.
After the dry powder tank 8 is aerated and fluidized in a qualified mode, whether the dry powder tank 8 is in a flow balance state can be directly judged according to the measurement results of the first flow meter and the second flow meter. Therefore, the pressure change condition in the dry powder tank 8 can be judged through the flow rate only by ensuring that the pressure of the dry powder tank 8 at the initial spraying meets the requirement.
If it is desired to ensure that the pressure in the dry powder tank 8 is within a specified range throughout the entire spray regime, it is necessary to further measure the pressure in the dry powder tank 8 to ensure the accuracy of the control of the dry powder spray system with flow as an indirect factor of control.
Further, in some embodiments, the electro-proportional pressure reducing valve is further configured to: when the first real-time flow is larger than the second real-time flow, the opening degree of the electric proportional pressure reducing valve is reduced, and when the first real-time flow is smaller than the second real-time flow, the opening degree of the electric proportional pressure reducing valve is increased, so that the second real-time flow is in a set flow interval.
Further, in some embodiments, the flow balancing assembly comprises:
and the second pressure reducing valve 4B is connected between the air inlet and the high-pressure air source 1 and is connected with the first pressure reducing valve 4 in parallel.
Through the arrangement of the second pressure reducing valve 4B, the newly added air supply pipeline is connected in parallel on the original air supply pipeline between the dry powder tank 8 and the high-pressure air source 1, and the pressure of the newly added air supply pipeline is controlled through the second pressure reducing valve 4B, so that the newly added air supply pipeline is also suitable for the requirement of the dry powder tank 8 on the air supply pressure.
Further, in order to ensure that the dry powder tank 8 always operates in a safe pressure range, and considering that the air supply demand of the dry powder tank 8 in the spray state is greater than that of the dry powder tank 8 in the fluidization state, in some embodiments, the outlet pressures of the first and second pressure reducing valves 4 and 4B are set to be not greater than the maximum operating pressure of the dry powder tank 8 minus 0.1 to 0.2MPa, and the outlet flow rate of the second pressure reducing valve 4B is set to be greater than the outlet flow rate of the first pressure reducing valve 4.
Further, in order to make the air supply flow of the high pressure air source 1 to the dry powder tank 8 adjustable, in some embodiments, the flow balancing assembly further comprises:
a first on-off valve 7 provided between the first pressure reducing valve 4 and the intake port; and
a second on-off valve 7B provided between the second pressure reducing valve 4B and the intake port;
wherein the first pressure reducing valve 4 and the second pressure reducing valve 4B are configured to: when the dry powder tank 8 is in a fluidization state, the first switch valve 7 is opened, and the second switch valve 7B is closed; when the dry powder tank 8 is in the spraying state, the first and second on-off valves 7 and 7B are opened.
Further, in some embodiments, the dry powder tank 8 further comprises an exhaust port, and the dry powder delivery system further comprises:
a third on/off valve 5 provided between the first pressure reducing valve 4 and the dry powder injector;
the exhaust valve 9 is arranged between the exhaust port of the dry powder tank 8 and the external environment; and
and the filtering device is arranged between the exhaust valve 9 and the exhaust port.
The exhaust valve 9 is used for controlling the connection and disconnection between the exhaust port and the external environment, and the third on-off valve 5 is used as a control valve on a dry powder ejector purging pipeline and can control the purging process through the opening and closing of the third on-off valve.
Further, in another aspect of the present disclosure, there is provided an elevated fire engine including a dry powder dispensing system as in any of the preceding embodiments.
Therefore, according to the dry powder spraying system and the elevating fire truck provided by the embodiment of the disclosure, the blowing pressure of the dry powder tank 8 can be kept stable in the spraying process, and the problem that the elevating spraying pressure is insufficient in the later stage of spraying due to the depressurization spraying of the conventional dry powder spraying system is solved.
In addition, by the method for increasing the air input in the spraying process, the flow fluidization process with a mature process is not influenced, the spraying pressure of the dry powder tank 8 is ensured by increasing the air input in the spraying process, the spraying speed of the dry powder and the powder discharging efficiency of the dry powder tank 8 are improved, the reduction of the air powder conveying speed caused by the rapid attenuation of the spraying pressure and the dry powder sedimentation in a conveying pipeline are avoided, and the spraying speed of the dry powder is further ensured.
In addition, the nitrogen which is sprayed in a large amount and provided by the method for increasing the air input can also reduce the oxygen content of the air around the fire scene, which has significant positive significance for fire prevention and explosion suppression, thereby improving the comprehensive fire extinguishing efficiency of the fire-fighting vehicle.
The present application is further described below with reference to the accompanying drawings 1-2:
the dry powder sprayer comprises an arm/ladder top dry powder gun 15, a dry powder gun 16 and a tank top dry powder gun 10, wherein the arm/ladder top dry powder gun 15 is communicated with a powder outlet of a dry powder tank 8 through a telescopic arm/ladder 14, an upper and lower vehicle revolving body 13 and a dry powder sprayer switch valve 12, the dry powder gun 16 is communicated with the powder outlet of the dry powder tank 8 through a dry powder pipe winding drum 17 and the dry powder sprayer switch valve 12, and the tank top dry powder gun 10 is directly communicated with the powder outlet of the dry powder tank 8 through the dry powder sprayer switch valve 12.
The third switch valves 5 are arranged between the high-pressure air source 1 and the arm/ladder top dry powder gun 15, between the high-pressure air source 1 and the dry powder gun 16, and between the high-pressure air source 1 and the tank top dry powder gun 10, and can control the high-pressure air source 1 to supply air to purge the dry powder injector.
The controller 18 in the figure is connected with the pressure sensor 19 and the electric proportional pressure reducing valve in a communication way, it should be noted that the controller 18 can be used as an intermediate component of the communication connection and has the functions of signal conversion and transmission, and the electric proportional pressure reducing valve can respond to the signal of the controller 18 or directly respond to the signal of the pressure sensor 19 to adjust the opening degree of the electric proportional pressure reducing valve.
Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.
Claims (12)
1. A dry powder dispensing system, comprising:
a high pressure gas source (1);
the dry powder tank (8) comprises an air inlet and a powder outlet, and the air inlet is communicated with the high-pressure air source (1);
the dry powder ejector is communicated with the powder outlet;
a first pressure reducing valve (4) connected between the air inlet and the high-pressure air source (1); and
and the flow balance assembly is arranged between the high-pressure air source (1) and the dry powder tank (8), and can make the flow passing through the air inlet and the powder outlet identical by controlling the air inflow from the high-pressure air source (1) to the dry powder tank (8).
2. Dry powder dispensing system according to claim 1, wherein the first pressure reducing valve (4) is an electro proportional pressure reducing valve and the flow balancing assembly comprises:
a timer for recording the spray time of the dry powder tank (8); and
a pressure sensor (19) for measuring a real-time pressure within the dry powder tank (8);
wherein the electro proportional pressure reducing valve is communicatively connected to the timer and the pressure sensor (19) and configured to: and adjusting the outlet pressure of the electro-proportional pressure reducing valve according to the spraying time and the real-time pressure.
3. The dry powder dispensing system of claim 2, wherein the electro proportional pressure relief valve is further configured to:
when the dry powder tank (8) is in a fluidization state, controlling the outlet pressure of the dry powder tank to be less than or equal to a first pressure value; and
when the dry powder tank (8) is in a spraying state, controlling the outlet pressure of the dry powder tank to be equal to a second pressure value;
wherein the second pressure value is greater than or equal to the first pressure value.
4. The dry powder delivery system of claim 3, wherein the first pressure value is a fixed function of the maximum working pressure of the dry powder canister (8) minus 0.1 to 0.2MPa, and the second pressure value is a variable function of the real-time pressure and the delivery time, such that the real-time pressure is not greater than the first set pressure minus 0.1 to 0.3 MPa.
5. The dry powder dispensing system of claim 4, wherein the electro proportional pressure relief valve is further configured to:
and when the real-time pressure is equal to the first set pressure minus 0.1-0.3 MPa, reducing the outlet pressure of the electric proportional pressure reducing valve.
6. The dry powder dispensing system of claim 1, wherein the first pressure relief valve (4) is an electro proportional pressure relief valve, the flow balancing assembly further comprising:
the first flowmeter is used for measuring a first real-time flow of the air inlet; and
the second flowmeter is used for measuring a second real-time flow of the powder outlet;
wherein the electro-proportional pressure reducing valve is communicatively connected to the first flow meter and the second flow meter and configured to: and adjusting the opening degree of the electric proportional pressure reducing valve according to the first real-time flow and the second real-time flow.
7. The dry powder dispensing system of claim 6, wherein the electro proportional pressure relief valve is further configured to: when the first real-time flow is larger than the second real-time flow, the opening degree of the electric proportional pressure reducing valve is reduced, and when the first real-time flow is smaller than the second real-time flow, the opening degree of the electric proportional pressure reducing valve is increased, so that the second real-time flow is in a set flow interval.
8. The dry powder delivery system of claim 1, wherein the flow balancing assembly comprises:
and the second pressure reducing valve (4B) is connected between the air inlet and the high-pressure air source (1) and is connected with the first pressure reducing valve (4) in parallel.
9. The dry powder delivery system according to claim 8, wherein the outlet pressures of the first pressure reducing valve (4) and the second pressure reducing valve (4B) are set to be not more than 0.1 to 0.2MPa less the maximum working pressure of the dry powder tank (8), and the outlet flow rate of the second pressure reducing valve (4B) is set to be larger than the outlet flow rate of the first pressure reducing valve (4).
10. The dry powder delivery system of claim 9, wherein the flow balancing assembly further comprises:
a first on-off valve (7) provided between the first pressure reducing valve (4) and the intake port; and
a second on-off valve (7B) provided between the second pressure reducing valve (4B) and the intake port;
wherein the first pressure reducing valve (4) and the second pressure reducing valve (4B) are configured to: when the dry powder tank (8) is in a fluidization state, opening the first switch valve (7) and closing the second switch valve (7B); when the dry powder tank (8) is in a spraying state, the first switch valve (7) and the second switch valve (7B) are opened.
11. The dry powder delivery system of claim 1, wherein the dry powder canister (8) further comprises an exhaust port, the dry powder delivery system further comprising:
a third on/off valve (5) provided between the first pressure reducing valve (4) and the dry powder injector;
the exhaust valve (9) is arranged between the exhaust port of the dry powder tank (8) and the external environment; and
a filtering device arranged between the exhaust valve (9) and the exhaust port.
12. A fire-fighting truck comprising a dry powder delivery system according to any one of claims 1 to 11.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911321471.1A CN110870960A (en) | 2019-12-20 | 2019-12-20 | Dry powder spraying system and elevating fire truck |
| EA202092789A EA038911B8 (en) | 2019-12-20 | 2020-12-17 | System for feeding and injecting a powder fire-extinguishing agent and lifting fire truck |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911321471.1A CN110870960A (en) | 2019-12-20 | 2019-12-20 | Dry powder spraying system and elevating fire truck |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110870960A true CN110870960A (en) | 2020-03-10 |
Family
ID=69717540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911321471.1A Pending CN110870960A (en) | 2019-12-20 | 2019-12-20 | Dry powder spraying system and elevating fire truck |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110870960A (en) |
| EA (1) | EA038911B8 (en) |
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| CN114470586A (en) * | 2022-01-28 | 2022-05-13 | 三一汽车制造有限公司 | Fire extinguishing system and working machine |
| CN115920289A (en) * | 2023-03-15 | 2023-04-07 | 飞龙消防技术有限公司 | Fire extinguishing agent sprinkling system with fire extinguishing early warning function |
| CN115970207A (en) * | 2022-12-27 | 2023-04-18 | 湖南中联重科应急装备有限公司 | Fire extinguishing system for fire truck and fire truck |
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Also Published As
| Publication number | Publication date |
|---|---|
| EA202092789A1 (en) | 2021-06-30 |
| EA038911B1 (en) | 2021-11-08 |
| EA038911B8 (en) | 2022-01-26 |
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