CN115634403B - Foam mixing device, system, foam fire engine and method - Google Patents
Foam mixing device, system, foam fire engine and method Download PDFInfo
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- CN115634403B CN115634403B CN202211396513.XA CN202211396513A CN115634403B CN 115634403 B CN115634403 B CN 115634403B CN 202211396513 A CN202211396513 A CN 202211396513A CN 115634403 B CN115634403 B CN 115634403B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/28—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture specially adapted for farming
Abstract
The invention discloses a foam mixing device, a foam mixing system, a foam fire engine and a foam fire engine method, and relates to the field of foam mixing devices, systems and foam fire engines for realizing different foaming requirements for different types of fires. The foam mixing device comprises a foam supply device, a water supply device, a fire pump, a first supply branch, a second supply branch and a control device. The fire pump comprises an inlet and an outlet; the inlet of the fire pump is in fluid communication with the foam supply and the water supply. The first supply branch is arranged between the outlet of the foam supply device and the inlet of the fire pump, and comprises a negative pressure power source. The second supply branch is arranged between the foam supply device and the inlet of the fire pump, and the first supply branch and the second supply branch are arranged in parallel; the second supply branch comprises a foam pump set. The control device is configured to execute the following control strategy: and controlling to start only the foam pump set, and starting both the foam pump set and the negative pressure power source according to the requirement. The technical scheme ensures the adjustment precision of large displacement and small displacement at the same time.
Description
Technical Field
The invention relates to the field of fire engines, in particular to a foam mixing device, a foam mixing system, a foam fire engine and a foam fire engine method.
Background
Foam mixing systems are used to produce fire fighting foam to achieve fire suppression. As the traditional foam mixing system is mostly used for class A fires, the proportion of class A foam is smaller (the range is 0.1% -1%), and the flow rate of the foam raw liquid output by a pump used for class A fires is about 18L/min. The displacement requirements for the foam pump unit are therefore smaller. For large petrochemical fires, because the foam mixing system belongs to a B type fire, when the foam mixing system is adopted for putting out a fire, the B type foam needs to be utilized, because the proportion of the common B type foam is higher (up to 6%), the displacement of the foam pump set is higher, and the proportion precision under the working condition of small flow can be reduced by increasing the displacement of the foam pump set.
The inventors have found that there is a need in the industry for a foaming system that can be adapted to different types of fires, meeting different foaming requirements.
Disclosure of Invention
The invention provides a foam mixing device, a foam mixing system, a foam fire engine and a foam fire engine method, which are used for realizing different foaming requirements for different types of fires.
The embodiment of the invention provides a foam mixing device, which comprises:
a foam supply device configured to supply a foam stock solution;
a water supply device configured to supply water;
a fire pump comprising an inlet and an outlet; an inlet of the fire pump is in fluid communication with the foam supply, the water supply; an outlet of the fire pump is configured to output a foam mixture;
a first supply branch arranged between an outlet of the foam supply device and an inlet of the fire pump, the first supply branch comprising a negative pressure power source;
a second supply branch also arranged between the outlet of the foam supply device and the inlet of the fire pump, and the first supply branch is arranged in parallel with the second supply branch; the second supply branch comprises a foam pump group; and
a control device electrically connected to both the flow meter and the foam pump unit, the control device configured to execute the following control strategy: when the flow of the required foam stock solution is smaller than or equal to the rated flow of the foam pump set, the negative pressure power source is closed, and the foam pump set is opened; when the flow rate of the required foam stock solution is larger than the rated flow rate of the foam pump set and the flow rate of the required foam stock solution is larger than the rated flow rate of the negative pressure power source, the negative pressure power source is started to the rated flow rate, and the foam pump set is configured to provide the foam stock solution according to the difference value between the set flow rate and the rated flow rate of the negative pressure power source.
In some embodiments, the first supply branch further comprises:
a first foam flow meter mounted upstream of the negative pressure power source; the first foam flow meter is configured to measure a flow rate of foam concentrate into the negative pressure power source; and
the first butterfly valve is arranged between the foam supply device and the negative pressure power source to control the connection and disconnection of the first supply branch.
In some embodiments, the foam mixing device further comprises:
the first supplementing branch comprises a second butterfly valve; the second butterfly valve is arranged in parallel with the first butterfly valve; the first supply branch is configured to be in fluid communication with an external source of foam.
In some embodiments, the second supply branch further comprises:
a second foam flow meter mounted upstream of the negative pressure power source; the second foam flow meter is configured to measure a flow rate of foam concentrate entering the negative pressure power source via the second supply branch;
and the third butterfly valve is arranged between the foam supply device and the foam pump set so as to control the connection and disconnection of the second supply branch.
In some embodiments, the foam mixing device further comprises:
the second supplementing branch comprises a fourth butterfly valve; the fourth butterfly valve is arranged in parallel with the third butterfly valve; the second supply branch is configured to be in fluid communication with an external source of foam.
In some embodiments, the foam mixing device further comprises:
a water pump inlet pipe interface arranged in parallel with the water supply, the water pump inlet pipe interface configured to be in fluid communication with an external water source; at least one of the water supply device and the water pump inlet pipe interface provides water to the inlet of the fire pump.
In some embodiments, the number of the water inlet pipe interfaces of the water pump is a plurality, and a plurality of the water inlet pipe interfaces of the water pump are arranged in parallel.
In some embodiments, the negative pressure power source comprises a venturi.
In some embodiments, the number of negative pressure power sources and the number of foam pump sets are one.
The embodiment of the invention also provides a foam mixing system, which comprises:
the mixing chamber comprises a first inlet, a second inlet and a outflow; the outflow port is configured to output foam for fire suppression;
a high pressure gas supply upstream of the mixing chamber and in fluid communication with the first inlet; and
the foam mixing device provided by any one of the aspects of the invention is also located upstream of the mixing chamber and in fluid communication with the second inlet;
wherein the mixing chamber is configured to mix the high pressure gas delivered by the high pressure gas supply device with the foam delivered by the foam mixing device to obtain fire fighting foam.
The embodiment of the invention also provides a foam fire engine, which comprises the foam mixing system provided by any technical scheme of the invention.
The embodiment of the invention also provides a foam proportion mixing method, which comprises the following steps:
calculating whether the flow of the required foam stock solution is smaller than or equal to the rated flow of the foam pump set;
if the flow of the required foam stock solution is smaller than or equal to the rated flow of a foam pump set of the foam mixing device, closing a negative pressure power source of the foam mixing device and opening the foam pump set of the foam mixing device; and if the flow rate of the required foam stock solution is greater than the rated flow rate of the foam pump set, starting the negative pressure power source to the rated flow rate, wherein the foam pump set is configured to provide the foam stock solution according to the difference value between the flow rate of the required foam stock solution and the flow rate provided by the negative pressure power source so that the total flow rate delivered by the fire pump is equal to the flow rate of the required foam stock solution.
In some embodiments, the required flow rate of the foam concentrate is determined according to the following: and calculating the flow of the foam stock solution according to the flow of the foam mixed solution output by the fire pump and the proportion of the foam stock solution input.
The foam mixing device provided by the technical scheme; the device has two working states: when the flow rate of the foam raw liquid required by the control device is calculated to be within the rated flow rate of the foam pump set according to the current flow rate and the foam proportion, only the foam pump set is started, and the foam raw liquid with the required flow rate is output; when the flow rate of the foam raw liquid required by the control device is calculated to exceed the rated working condition of the foam pump group, the negative pressure power source is completely started to provide foam raw liquid with a certain flow rate; at this time, the control device compares the difference between the flow value and the flow value required by the system, and starts the foam pump group to output the difference flow. According to the technical scheme, the high-flow output of the system is met under the condition that the displacement of the foam pump set is not increased, and meanwhile, the system is guaranteed to have high adjusting precision under the conditions of high displacement and low displacement.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
fig. 1 is a schematic structural diagram of a foam mixing device according to an embodiment of the present invention.
Reference numerals:
1. a foam supply device; 2. a water supply device; 3. a fire pump; 4. a first supply branch; 5. a second supply branch; 6. a first supply branch; 7. a second supply branch; 8. a water inlet pipe joint of the water pump; 9. a water flow meter; 10. a first check valve; 11. a first pressure gauge; 13. cleaning a ball valve; 14. a vacuum gauge;
41. a negative pressure power source; 42. a first foam flow meter; 43. a first butterfly valve; 44. a pressurized water ball valve; 45. a sixth butterfly valve;
51. a foam pump set; 52. a second foam flow meter; 53. a third butterfly valve; 54. a fifth butterfly valve; 55. a pressure gauge; 56. a second check valve;
61. a second butterfly valve;
71. and a fourth butterfly valve.
Detailed Description
The technical scheme provided by the invention is described in more detail below with reference to fig. 1.
A foam fire engine is a fire engine that can deliver foam to extinguish a fire. The foam fire engine has two functions: and independently outputting fire-fighting foam and independently outputting water.
The foam mixing system is to inject foam stock solution into pure water by using a foam pump set 51 to form foam mixed solution, and then to inject compressed air into the foam mixed solution to generate foam. The foam produced by the foam mixing system has the characteristics of uniformity, fineness, long liquid separation time, good stability, high fire extinguishing efficiency and strong re-burning resistance. From the above description, it is known that fire fighting foam is obtained by mixing a foam mixture and a high pressure gas. The foam mixed liquid is obtained by adopting the foam mixing device provided by the embodiment of the invention. The ratio of foam to water in the foam mixture is adjustable. The mixing ratio of the foam stock solution and water in the required foam mixed solution is also different according to the type of fire. The foam mixing device provided by the embodiment of the invention is used for meeting the requirements of different mixing ratios of foam stock solution and water.
Fire is classified into A, B, C, D, E, F according to the national standard fire classification. The foam fire engine is suitable for class A fire and class B fire. Class a fires refer to solid matter fires. Such materials are generally of an organic nature and produce burning embers when burned; such as fires in wood, hay, coal, cotton, wool, hemp, paper, etc. Class B fires refer to liquid or meltable solid matter fires; such as kerosene, diesel oil, crude oil, methanol, ethanol, asphalt, paraffin wax, plastics, etc.
When fire is extinguished in a type A fire, the ratio of the foam stock solution to the foam mixed solution is smaller, generally 0.1% -1%, and the required foam stock solution is less. The technical scheme of the embodiment of the invention can be suitable for a foam mixing system with a large flow of ten thousand liters. Naturally, class a fires can also be extinguished. The foam mixed liquid required by the type A fire disaster is too little, and the fire disaster can be realized by adopting a common foam mixed system, and the universal liter high-flow foam mixed system is not needed.
When fire is extinguished in B-type fire, the ratio of fire-fighting foam to foam mixed liquid is high, and the ratio of the common water film-forming foam liquid can reach 6%. For a foam mixing system with a large flow rate of ten thousand liters, the required foam raw liquid flow rate is large. The technical scheme of the embodiment of the invention can be suitable for a foam mixing system with a large flow of ten thousand liters. The large flow of the foam mixture is 10000L/min. The flow rate of the foam stock solution required is at least 600L/min calculated according to the foam stock solution proportion of the lowest 6 percent. Considering the applicability of different foam liquids, the adjusting proportion of the foam mixing system needs to be adjustable by 1-10%, and the maximum flow of the foam stock solution needs to reach 1000L/min. However, the current maximum flow foam pump sets are also up to 600L/min. The foam pump set has extremely high cost and extremely large size, and the flow requirement of about 1000L/min can not be met by increasing the quantity of the foam pump sets. About 1000L/min means 1000L/min to 1100L/min.
According to the technical scheme, the universal liter high-flow foam mixing device can be provided on the premise of accurate control, so that the fire extinguishing requirement of B-type fires is met.
The embodiment of the invention provides a foam mixing device, which comprises a foam supply device 1, a water supply device 2, a fire pump 3, a first supply branch 4, a second supply branch 5 and a control device. The foam supply device 1 is configured to supply a foam stock solution; the water supply device 2 is configured to supply water; the fire pump 3 comprises an inlet and an outlet; the first supply branch 4 is arranged between the outlet of the foam supplier 1 and the inlet of the fire pump 3, the first supply branch 4 comprising a negative pressure power source 41 and a first foam flow meter 42. The second supply branch 5 is also arranged between the outlet of the foam supply device 1 and the inlet of the fire pump 3, and the first supply branch 4 is arranged side by side with the second supply branch 5; the second supply branch 5 comprises a foam pump set 51 and a second foam flowmeter 52. The control device is electrically connected to both the flow meter and the foam pump unit 51, the control device being configured to execute the following control strategy: when the set flow rate is smaller than or equal to the rated flow rate of the foam pump unit 51, the negative pressure power source 41 is turned off, and the foam pump unit 51 is turned on. When the set flow rate is greater than the rated flow rate of the foam pump unit 51, the negative pressure power source 41 is turned on to the rated flow rate, and the foam pump unit 51 is configured to supply the foam concentrate in accordance with the difference between the set flow rate and the rated flow rate of the negative pressure power source 41.
The foam supply device 1 is, for example, a foam tank, in which a foam concentrate is contained. The foam supply device 1 can move along with the fire engine so as to rapidly and flexibly meet the field fire extinguishing requirements of different sites. The capacity of the foam supply device 1 is determined according to the model of the fire truck, and the larger the model of the fire truck is, the stronger the carrying capacity is, and the larger the capacity of the water supply device 2 is correspondingly. The foam mixing device provided by the embodiment of the invention can meet the fire extinguishing requirements of various B-type fires. The capacity of the foam supply device 1 is designed based on the large foam concentrate demand. Of course, in some embodiments, a replenishment branch is provided in addition to the foam supplier 1 to introduce foam concentrate from the outside when the foam concentrate in the foam supplier 1 is insufficient to meet fire extinguishing requirements. In some embodiments hereafter, two replenishment branches are provided as needed to meet the requirements of replenishing foam stock solution from different supply branches.
The water supply device 2 is, for example, a water tank, in which water is contained. The water supply device 2 can also move along with the fire engine so as to rapidly and flexibly meet the field fire extinguishing requirements of different sites. The capacity of the water supply device 2 is determined according to the model of the fire truck, and the larger the model of the fire truck is, the stronger the carrying capacity is, and the larger the capacity of the water supply device 2 is correspondingly.
In some embodiments, the foam mixing device further comprises a water pump inlet pipe interface 8. The water inlet pipe joint 8 of the water pump is used for being communicated with an external water pipe and a water source so as to additionally introduce water when the water quantity in the water tank does not meet the requirement or the water flow rate does not meet the requirement. A water inlet pipe interface 8 of the water pump is arranged in parallel with the water supply device 2, the water inlet pipe interface 8 of the water pump being configured to be in fluid communication with an external water source; at least one of the water supply device 2 and the water pump inlet pipe connection 8 provides water to the inlet of the fire pump 3.
For a fire truck with a large flow rate of ten thousand liters, the required fire foam flow rate is very large, which requires a particularly large flow rate of the foam mixture. The foam mixed solution is obtained by mixing water and foam stock solution, and accordingly, the flow rates of the water and the foam stock solution are also required to be very large. Simply relying on one water pipe to drink water from the water supply device 2 may result in an insufficient amount of water or a very thick water pipe being required. If water is introduced from the water inlet pipe interfaces 8 of the plurality of water pumps or a plurality of water pipes are arranged between the water supply device 2 and the fire pump 3, the water flow can be effectively improved, so as to meet the requirement of generating fire-fighting foam by a fire truck with a large flow of ten thousand liters. Therefore, in some embodiments, the number of water pump inlet pipe interfaces 8 is plural, and the plurality of water pump inlet pipe interfaces 8 are arranged in parallel to effectively increase the flow of water into the fire pump 3.
Both the first supply branch 4 and the second supply branch 5 serve to introduce the foam supply 1 or an external foam concentrate into the fire pump 3. The flow difference of the high-flow and low-flow fire-fighting foam can be 50 times to 100 times. With such a large flow gap, if the flow of the foam concentrate from the foam supply apparatus 1 to the fire pump 3 is achieved using only the foam pump unit 51, a plurality of foam pump units 51 need to be provided. Each foam pump unit 51 is sold up to several hundred thousand yuan and is very large in size. If a plurality of foam pump groups 51 are provided, not only the overall manufacturing cost of the fire engine is greatly increased, but also a large amount of size space of the fire engine is occupied, which results in insufficient arrangement space of the foam supply device 1 and the water supply device 2, and also the foam supply device 1 and the water supply device 2 with large capacity cannot be provided. According to the technical scheme provided by the embodiment of the invention, different power sources are arranged for the first supply branch 4 and the second supply branch 5: the first supply branch 4 adopts a negative pressure power source 41 to supply foam stock solution, and the second supply branch 5 adopts a foam pump group 51 to supply. The foam pump unit 51 is a mechanism for delivering foam liquid and pressurizing the foam liquid.
And the supply strategy of the negative pressure power source 41 and the foam pump group 51 is designed: the foam pump unit 51 adopts a foam pump unit 51 with small displacement, when the required foam stock solution proportion is low, namely, the set flow rate of the foam stock solution is smaller than or equal to the rated flow rate of the foam pump unit 51, the foam pump unit 51 is independently started at the moment, namely, only the second supply branch 5 is used for supplying, and the first supply branch 4 does not work at the moment. The foam pump unit 51 enables precise control over the rated flow range of the foam pump unit 51.
When the ratio of the required foam stock solution is high, that is, the set flow rate of the foam stock solution is greater than the rated flow rate of the foam pump set 51, and the set flow rate of the foam stock solution is greater than the rated flow rate of the negative pressure power source 41, for example, when the foam stock solution is used for the fire extinguishing requirement of the class B fire, the negative pressure power source 41 is started at this time, and the negative pressure power source 41 is started to the rated flow rate state, so that an additional control element is not required to be arranged to adjust the opening degree of the negative pressure power source 41.
The negative pressure power source 41 is, for example, a venturi tube including a first opening, a second opening, and a third opening, as shown in fig. 1. The first opening is in fluid communication with the first supply branch 4 for effecting a supply of foam concentrate in the foam supply device 1. The second opening is in fluid communication with the outlet of the fire pump 3 to create a negative pressure. The third opening is in fluid communication with the inlet of the fire pump 3 to deliver foam concentrate sucked into the venturi to the fire pump 3.
With continued reference to FIG. 1, a pressurized water ball valve is provided at the third opening of the venturi. When the venturi tube is needed to be used, the pressure water ball valve is in an open state, and a branch where the pressure water ball valve is located is conducted, so that negative pressure can be formed in the venturi tube to suck foam stock solution in the foam supply device 1.
In order to achieve a precise control of the foam mixture output by the fire pump 3, it is necessary to precisely obtain the flow rate of the foam concentrate into the first supply branch 4. The first supply branch 4 comprises a first foam flow meter 42, and the flow rate of the foam concentrate in the first supply branch 4 is measured by the first foam flow meter 42, so that the control device controls the opening degree of the foam pump group 51 according to the relation between the required flow rate, the rated flow rate of the foam pump group 51 and the flow rate of the foam concentrate in the first supply branch 4. Within the rated flow range of the foam pump unit 51, the foam pump unit 51 can achieve accurate control of any flow.
For example, the flow rate of the foam concentrate is a, the rated flow rate of the negative pressure power source 41 is B, and the rated flow rate of the foam pump unit 51 is C. If a is greater than C and a is greater than B, the negative pressure power source 41 is turned on to the maximum state, and theoretically, the flow rate provided by the first supply branch 4 should be B. However, the negative pressure power source 41 has low accuracy due to the specific structure, so that the actual flow in the first supply branch 4 also needs the first foam flowmeter 42 to accurately measure, for example, the flow obtained by measuring the first foam flow is B'. The foam pump unit 51 actually needs to provide a flow rate C '=a-B'. The foam pump set 51 is accurate in control, and can realize accurate control of flow by adjusting working parameters of the foam pump set in the rated flow range so as to meet the proportion requirement of foam mixed liquid.
In some embodiments, the control device is employed to implement a control strategy. The control device is, for example, a central control device of a fire truck, and also a PLC controller or the like.
With continued reference to fig. 1, in some embodiments, the first supply branch 4 further includes a first butterfly valve 43, where the first butterfly valve 43 is disposed between the foam supply device 1 and the negative pressure power source 41 to control the on and off of the first supply branch 4. The first butterfly valve 43 is used to control the state of the first supply branch 4. In a state where the first butterfly valve 43 is opened, the first supply branch 4 is conductive, and the foam supply apparatus 1 can supply the foam concentrate to the negative pressure power source 41. In a state where the first butterfly valve 43 is closed, the first supply branch 4 is open, and the foam supply apparatus 1 cannot supply the foam concentrate to the negative pressure power source 41.
As introduced above, to increase the flexibility of use of the foam mixing apparatus, it is convenient to replenish the foam concentrate, and in some embodiments the foam mixing apparatus further comprises a first replenishment branch 6, the first replenishment branch 6 comprising a second butterfly valve 61; the second butterfly valve 61 is arranged in parallel with the first butterfly valve 43; the first supply branch 6 is configured to be in fluid communication with an external source of foam.
The first supply branch 6 and the first supply branch 4 are juxtaposed, and share the negative pressure power source 41, or the negative pressure power sources 41 may be provided separately. In some embodiments, the description will be given taking the case where the negative pressure power source 41 is shared by both. For a fire engine with a large flow rate of ten thousand liters, the size of the single negative pressure power source 41 is already very large, and if two fire engines are provided, the size of the fire engine is further increased, and the installation space of the foam supply device 1, the water supply device 2 and other components is reduced. Therefore, it is preferable that the first supply branch 6 and the first supply branch 4 share the same negative pressure power source 41.
With continued reference to fig. 1, in some embodiments, the second supply branch 5 further comprises a third butterfly valve 53, the third butterfly valve 53 being arranged between the foam supply device 1 and the foam pump stack 51 to control the on and off of the second supply branch 5. The third butterfly valve 53 is used to control the state of the second supply branch 5. In a state where the third butterfly valve 53 is opened, the second supply branch 5 is conductive, and the foam supply apparatus 1 can supply the foam concentrate to the negative pressure power source 41. In a state where the third butterfly valve 53 is closed, the second supply branch 5 is open, and the foam supply apparatus 1 cannot supply the foam concentrate to the negative pressure power source 41.
The first supply branch 4 and the second supply branch 5 are arranged in parallel, and the working states of the first supply branch 4 and the second supply branch 5 are two types: the second supply branch 5 is individually conductive and both the first supply branch 4 and the second supply branch 5 are conductive. These two states correspond to the fire extinguishing requirements of the class B fire disaster with small flow accurate control and the fire extinguishing requirements of the class B fire disaster with large flow accurate control respectively. Class B fires themselves can also be classified into various types depending on the degree of fire. The foam mixing device provided by the embodiment of the invention can meet the fire extinguishing requirements of B-type fires of various degrees.
To increase the flexibility of the foam mixing device, to extend the applicable scenario, to increase the flexibility of the foam concentrate supply, in some embodiments the second supply branch 5 further comprises a second replenishment branch 7, the second replenishment branch 7 comprising a fourth butterfly valve 71; the fourth butterfly valve 71 is arranged in parallel with the third butterfly valve 53; the second supply branch 7 is configured to be in fluid communication with an external source of foam.
Referring to fig. 1, in some embodiments, the number of negative pressure power sources 41, foam pump stacks 51 is one. Therefore, on the basis of the minimum power source, the high flow and the low flow can be accurately controlled, and a large amount of production and manufacturing cost is saved.
The operation of the foam mixing device is described below.
The foam supply device 1 employs a foam tank, and the water supply device 2 employs a water tank. The fire pump 3 supplies water from an inlet through a water source of the water tank fire engine or an external water source of a water inlet pipe connector 8 of the water pump, and forms pressurized water at an outlet of the fire pump 3 through rotation of an impeller, and a water flow meter 9 is arranged at the outlet of the fire pump 3. At this time, the water flowmeter 9 displays the current flow value, and the control device calculates the flow value and the foam proportion input by the user to obtain the required foam raw flow value. The outlet of the fire pump 3 is also provided with a first check valve 10 and a first pressure gauge 11. A vacuum gauge 14 can be installed at the water inlet pipe joint 8 of the water pump.
If this flow value is smaller than the rated flow of the foam pump unit 51 (here set to 600L/min), only the foam pump unit 51 is started. The outlet of the foam pump group 51 is provided with a second foam flowmeter 52, a fifth butterfly valve 54, a second pressure gauge 55 and a second check valve 56. At this time, the third butterfly valve 53 and the fifth butterfly valve 54 are opened, the foam pump set 51 is started, the system automatically controls the foam rotation speed according to the foam flow, and finally, the required foam raw liquid flow value is output, so that the current foam proportion is consistent with the user input value.
If the flow value is greater than the rated flow of the foam pump unit 51, which is set to 600L/min here, the foam pump unit 51 is started simultaneously with the negative pressure power source 41. A sixth butterfly valve is also mounted downstream of the first foam flow meter 42. For a negative pressure system, the pressure water ball valve 44, the first butterfly valve 43 and the sixth butterfly valve 45 are simultaneously opened; the venturi tube forms negative pressure, and foam stock solution enters the inlet of the fire pump 3 through the first butterfly valve 43 and the sixth butterfly valve. For a positive pressure system, the fourth butterfly valve 71 and the fifth butterfly valve are opened, the foam pump set 51 is started, and at the moment, the control device reads the first foam flowmeter 42 and compares the flow value of the first foam flowmeter 42 with the flow value difference of the foam raw liquid required by the system. And adjusts the rotation speed of the foam pump group 51 to make the output flow consistent with the difference value, that is, the sum of the measured value of the first foam flowmeter 42 and the second foam flowmeter 52 is the foam flow value required by the system.
When cleaning is needed, flushing is achieved by cleaning the ball valve 13.
According to the technical scheme, when the negative pressure system works, the valve is fully opened, the control device detects the foam flow on the pipeline and compares the foam flow with the total flow required by the system, and the difference value is calculated, so that the foam pump set 51 is regulated, the output flow is equal to the difference value, and the flow required by the system is achieved. The overall flow regulation accuracy of the system depends on the control accuracy of the positive pressure system. Therefore, the working flow of the whole system is improved by adding the negative pressure system on the basis of the foam pump group 51, and meanwhile, the precision of the system is maintained.
Other embodiments of the present invention provide a foam mixing system, including a mixing chamber, a high pressure gas supply device, and a foam mixing device provided in any of the embodiments of the present invention. The mixing chamber comprises a first inlet, a second inlet and an outlet; the outflow opening is configured to output foam for fire suppression. A high pressure gas supply is located upstream of the mixing chamber and in fluid communication with the first inlet. A foam mixing device is also located upstream of the mixing chamber and is in fluid communication with the second inflow port. Wherein the mixing chamber is configured to mix the high pressure gas delivered by the high pressure gas supply device with the foam delivered by the foam mixing device to obtain the fire fighting foam.
The foam mixing system is a system for actively mixing high-pressure gas with foam mixed liquid in a mixing chamber to generate foam for extinguishing fire, and comprises a foam pump group 51, an air compressor, a foam gun, related pipelines and the like.
The foam mixing system mixes the foam mixed liquid generated by the foam mixing device with high-pressure gas to obtain the fire-fighting foam. The pressure range of the high-pressure gas is the same as the pressure required in the production of the existing fire fighting foam.
Still other embodiments of the present invention provide a foam fire engine comprising the foam mixing system provided by any one of the aspects of the present invention.
The embodiment of the invention also provides a foam proportion mixing method which can be realized by adopting the foam mixing device. The foam proportion mixing method comprises the following steps:
first, it is calculated whether the flow rate of the foam concentrate required is less than or equal to the rated flow rate of the foam pump unit 51.
The flow rate of the foam concentrate required is determined according to the conditions of the fire scene and the flow rate data is input to a control device (not shown). The control device is, for example, a central control device of a fire engine, and also a PLC control device or the like.
In some embodiments, the required flow rate of the foam concentrate is determined according to the following: and calculating the flow of the foam stock solution according to the flow of the foam mixed solution output by the fire pump 3 and the proportion of the foam stock solution input. The ratio of the foam stock solution is input into the control device by an operator.
And secondly, if the required set flow rate is smaller than or equal to the rated flow rate of the foam pump group 51 of the foam mixing device, the negative pressure power source 41 of the foam mixing device is turned off, and the foam pump group 51 of the foam mixing device is turned on. If the required set flow rate is greater than the rated flow rate of the foam pump unit 51, the negative pressure power source 41 is turned on to the rated flow rate, and the foam pump unit 51 is configured to supply the foam concentrate according to the difference between the set flow rate and the rated flow rate of the negative pressure power source 41 so that the total flow rate delivered by the fire pump 3 is equal to the required flow rate of the foam concentrate.
The negative pressure power source 41 is simply controlled to the rated flow, and the problem that the flow cannot be accurately controlled due to large control error of the negative pressure power source 41 can be avoided.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate description of the present invention and simplify the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the protection of the present invention.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be replaced with others, which may not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (13)
1. A foam mixing device, comprising:
a foam supply device (1) configured to supply a foam stock solution;
a water supply device (2) configured to supply water;
a fire pump (3) comprising an inlet and an outlet; an inlet of the fire pump (3) is in fluid communication with the foam supply device (1) and the water supply device (2); the outlet of the fire pump (3) is configured to output a foam mixture;
a first supply branch (4) arranged between an outlet of the foam supply device (1) and an inlet of the fire pump (3), the first supply branch (4) comprising a negative pressure power source (41);
a second supply branch (5) also arranged between the outlet of the foam supply device (1) and the inlet of the fire pump (3), and the first supply branch (4) being arranged in parallel with the second supply branch (5); the second supply branch (5) comprises a foam pump group (51); and
a control device electrically connected to the foam pump unit (51), the control device being configured to execute the following control strategy: when the flow rate of the required foam stock solution is smaller than or equal to the rated flow rate of the foam pump set (51), the negative pressure power source (41) is closed, and the foam pump set (51) is opened; when the flow rate of the required foam stock solution is larger than the rated flow rate of the foam pump group (51) and the flow rate of the required foam stock solution is larger than the rated flow rate of the negative pressure power source (41), the negative pressure power source (41) is started to the rated flow rate, and the foam pump group (51) is configured to provide the foam stock solution according to the difference value between the flow rate of the required foam stock solution and the rated flow rate of the negative pressure power source (41), so that the system has high regulation precision under large displacement and small displacement.
2. Foam mixing device according to claim 1, wherein the first supply branch (4) further comprises:
a first foam flow meter (42) mounted upstream of the negative pressure power source (41); the first foam flow meter (42) is configured to measure a flow rate of foam concentrate entering the negative pressure power source (41) via the first supply branch (4); and
and a first butterfly valve (43) arranged between the foam supply device (1) and the negative pressure power source (41) for controlling the connection and disconnection of the first supply branch (4).
3. The foam mixing device of claim 2, further comprising:
a first replenishment branch (6) comprising a second butterfly valve (61); the second butterfly valve (61) is arranged in parallel with the first butterfly valve (43); the first replenishment branch (6) is configured to be in fluid communication with an external source of foam.
4. Foam mixing device according to claim 1, wherein the second supply branch (5) further comprises:
a second foam flow meter (52), the outlet of the foam pump group (51) is provided with the second foam flow meter (52); and
and a third butterfly valve (53) is arranged between the foam supply device (1) and the foam pump group (51) so as to control the connection and disconnection of the second supply branch (5).
5. The foam mixing device of claim 4, further comprising:
a second supply branch (7) comprising a fourth butterfly valve (71); the fourth butterfly valve (71) is arranged in parallel with the third butterfly valve (53); the second replenishment branch (7) is configured to be in fluid communication with an external foam source.
6. The foam mixing device of claim 1, further comprising:
a water pump inlet pipe interface (8) arranged in parallel with the water supply device (2), the water pump inlet pipe interface (8) being configured to be in fluid communication with an external water source; at least one of the water supply device (2) and the water pump inlet pipe connector (8) provides water to the inlet of the fire pump (3).
7. Foam mixing device according to claim 6, wherein the number of water inlet pipe interfaces (8) of the water pump is plural, a plurality of water inlet pipe interfaces (8) of the water pump being arranged in parallel.
8. Foam mixing device according to claim 1, wherein the negative pressure power source (41) comprises a venturi.
9. Foam mixing device according to claim 1, wherein the number of negative pressure power sources (41) and the number of foam pump groups (51) is one.
10. A foam mixing system, comprising:
the mixing chamber comprises a first inlet, a second inlet and a outflow; the outflow port is configured to output foam for fire suppression;
a high pressure gas supply upstream of the mixing chamber and in fluid communication with the first inlet; and
the foam mixing apparatus of any one of claims 1-9, also located upstream of the mixing chamber, and in fluid communication with the second inflow port;
wherein the mixing chamber is configured to mix the high pressure gas delivered by the high pressure gas supply device with the foam delivered by the foam mixing device to obtain fire fighting foam.
11. A foam fire engine, comprising: the foam mixing system of claim 10.
12. A method of mixing foam proportions comprising the steps of:
calculating whether the flow rate of the required foam stock solution is smaller than or equal to the rated flow rate of a foam pump group (51) of the foam mixing device according to any one of claims 1 to 9;
if the flow rate of the required foam stock solution is smaller than or equal to the rated flow rate of a foam pump set (51) of the foam mixing device, closing a negative pressure power source (41) of the foam mixing device, and opening the foam pump set (51); if the flow rate of the required foam concentrate is greater than the rated flow rate of the foam pump unit (51), the negative pressure power source (41) is turned on to the rated flow rate, and the foam pump unit (51) is configured to supply the foam concentrate according to the difference between the flow rate of the required foam concentrate and the flow rate supplied by the negative pressure power source (41).
13. The foam proportioning method of claim 12, wherein the flow rate of the foam stock required is determined according to the following: and calculating the flow of the foam stock solution according to the flow of the foam mixed solution output by the fire pump (3) and the proportion of the foam stock solution input.
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| CN202211396513.XA CN115634403B (en) | 2022-11-09 | 2022-11-09 | Foam mixing device, system, foam fire engine and method |
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| CN202211396513.XA CN115634403B (en) | 2022-11-09 | 2022-11-09 | Foam mixing device, system, foam fire engine and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8307907B2 (en) * | 2008-02-28 | 2012-11-13 | Hale Products, Inc. | Hybrid foam proportioning system |
| CN104492008B (en) * | 2015-01-05 | 2016-04-13 | 北京中卓时代消防装备科技有限公司 | The pouring-in positive/negative-pressure foam proportioning system of a kind of foam truck |
| CN207545664U (en) * | 2017-04-17 | 2018-06-29 | 上海博灿信号设备有限公司 | The intelligent froth ratio mixed layout structure of Integral positive/negative pressure |
| CN107519595A (en) * | 2017-10-11 | 2017-12-29 | 南京德沃克自动化有限公司 | A kind of big flow CAFS |
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