CN115337578B - Foam mixed liquid control method, device and system, fire-fighting vehicle and storage medium - Google Patents
Foam mixed liquid control method, device and system, fire-fighting vehicle and storage medium Download PDFInfo
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- CN115337578B CN115337578B CN202210998223.6A CN202210998223A CN115337578B CN 115337578 B CN115337578 B CN 115337578B CN 202210998223 A CN202210998223 A CN 202210998223A CN 115337578 B CN115337578 B CN 115337578B
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- 239000006260 foam Substances 0.000 title claims abstract description 451
- 239000007788 liquid Substances 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 303
- 239000011259 mixed solution Substances 0.000 claims abstract description 19
- 239000011550 stock solution Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 90
- 238000012545 processing Methods 0.000 claims description 23
- 238000001514 detection method Methods 0.000 claims description 15
- 239000012141 concentrate Substances 0.000 claims description 8
- 230000006870 function Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000004891 communication Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 235000019800 disodium phosphate Nutrition 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C5/00—Making of fire-extinguishing materials immediately before use
- A62C5/002—Apparatus for mixing extinguishants with water
-
- 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
- A62C37/00—Control of fire-fighting equipment
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C5/00—Making of fire-extinguishing materials immediately before use
- A62C5/02—Making of fire-extinguishing materials immediately before use of foam
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C99/00—Subject matter not provided for in other groups of this subclass
- A62C99/0009—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames
- A62C99/0036—Methods of extinguishing or preventing the spread of fire by cooling down or suffocating the flames using foam
Abstract
The disclosure provides a foam mixed liquid control method, device and system, a fire-fighting vehicle and a storage medium, and relates to the field of control. The foam mixed liquid control method comprises the following steps: starting the water pump and opening the pressure water valve so that water in the reservoir enters the venturi tube; determining a corresponding foam proportion gradient value according to a preset foam proportion value; inquiring an outlet pressure target value related to an inlet pressure value of the water pump according to a functional relation corresponding to the foam proportion gradient value; adjusting the rotational speed of the water pump so that the outlet pressure value of the water pump reaches the outlet pressure target value; opening a foam sucking proportional valve so that foam stock solution in the foam pool enters a venturi tube and is mixed with water in the venturi tube to generate foam mixed solution; and adjusting the opening of the foam sucking proportional valve according to a preset foam proportional value so that the foam ratio of the foam mixed solution is equal to the preset foam proportional value.
Description
Technical Field
The present disclosure relates to the field of control, and in particular, to a foam mixed solution control method, device and system, fire-fighting vehicle and storage medium.
Background
The foam system used by the fire engine can be divided into a positive pressure foam system and a negative pressure foam system, and the negative pressure foam system is widely used due to low price and large flow of foam fire-fighting liquid.
In the negative pressure type foam system, when the pressure difference of water flowing through the venturi tube reaches a certain value, negative pressure is generated inside the venturi tube. Under the condition, the foam sucking proportional valve is opened, foam stock solution in the foam pool is sucked into the venturi tube and mixed with water to generate foam mixed solution, and finally the foam mixed solution is sprayed out through the water cannon or the water gun to perform fire-fighting and fire-extinguishing operation.
Before the foam-sucking proportional valve is opened, it must be ensured that the venturi has developed a negative pressure, whereby the suction of the foam concentrate into the venturi is ensured. If the foam sucking proportional valve is opened under the condition that the venturi tube does not form negative pressure, water can enter the foam pool through the foam sucking proportional valve, so that the pollution of the foam stock solution is disabled.
In order to solve this problem, the currently common solutions are the following three:
1. and the time for opening the foam sucking proportional valve is pushed back, and meanwhile, the outlet pressure of the water pump is increased, so that the hydraulic pressure difference of water flowing through the venturi tube is increased, and the venturi tube is ensured to form enough negative pressure.
2. A one-way valve is additionally arranged between the foam sucking proportional valve and the foam pool, so that the liquid in the foam pool is only allowed to flow unidirectionally to the foam sucking proportional valve, and is not allowed to flow reversely.
3. And a pressure sensor is arranged at the foam sucking port of the venturi tube and is used for detecting whether the venturi tube generates enough negative pressure.
Disclosure of Invention
The inventors have noted that in the three related art described above, which address the entry of water into the foam pool, there are the following drawbacks:
in the first scheme, the speed of foam mixing is reduced due to the time for opening the back suction foam proportional valve, and the liquid outlet time of the foam mixture is prolonged, so that the fire extinguishing efficiency is affected.
In the second scheme, as the one-way valve is additionally arranged between the foam sucking proportional valve and the foam pool, the pipeline resistance of foam sucking can be increased, the flow of foam liquid is insufficient, and the generated foam mixed liquid has poor fire extinguishing effect.
In the third scheme, as the pressure sensor is required to be arranged at the foam suction port of the venturi tube, the cost of the fire-fighting vehicle is increased, meanwhile, the hidden trouble is increased, and the reliability of the vehicle is reduced.
Accordingly, the present disclosure provides a foam mixed liquid control scheme, which can effectively prevent water from flowing into a foam tank, cause foam liquid pollution failure, and simultaneously can accelerate the foam liquid mixing speed and shorten the foam mixed liquid discharging time.
According to a first aspect of embodiments of the present disclosure, there is provided a foam mixed liquor control method, performed by a foam mixed liquor control apparatus, including: starting the water pump and opening the pressure water valve so that water in the reservoir enters the venturi tube; determining a corresponding foam proportion gradient value according to a preset foam proportion value; inquiring an outlet pressure target value related to an inlet pressure value of the water pump according to a functional relation corresponding to the foam proportion gradient value; adjusting the rotation speed of the water pump so that the outlet pressure value of the water pump reaches the outlet pressure target value; opening a foam sucking proportional valve so that foam stock solution in a foam pool enters the venturi tube and is mixed with water in the venturi tube to generate foam mixed solution; and adjusting the opening of the foam sucking proportional valve according to the preset foam proportional value so that the foam ratio of the foam mixed solution is equal to the preset foam proportional value.
In some embodiments, adjusting the opening of the foam suction proportional valve according to the preset foam proportional value includes: determining the foam ratio of the foam mixed liquid according to a water flow value Q1 at the outlet of the water pump and a foam raw liquid flow value Q2 entering the venturi tube; and if the foam ratio of the foam mixed solution is smaller than the preset foam ratio value, increasing the opening of the foam sucking proportional valve until the foam ratio of the foam mixed solution is equal to the preset foam ratio value.
In some embodiments, if the foam ratio of the foam mixture is greater than the preset foam ratio value, the opening of the foam suction proportional valve is decreased until the foam ratio of the foam mixture is equal to the preset foam ratio value.
In some embodiments, the froth ratio of the froth mixture is the ratio of the froth raw liquid flow value Q2 to the sum of the water flow value Q1 and the froth raw liquid flow value Q2.
In some embodiments, the above method further comprises: determining a functional relationship between an inlet pressure value of the water pump and an outlet pressure target value of the water pump under the condition of a preset foam proportion gradient value; wherein determining the functional relationship comprises: selecting a preset foam proportion gradient value and a plurality of different water pump inlet pressure values; starting the water pump and opening the pressure water valve so that water in the reservoir enters the venturi tube; adjusting the rotation speed of the water pump according to the inlet pressure value of each water pump, and opening a foam sucking proportional valve under the condition that the venturi tube forms negative pressure, wherein the opening of the foam sucking proportional valve is the largest; determining the foam ratio of the foam mixed liquid according to the water flow value Q1 at the outlet of the water pump and the foam raw liquid flow value Q2 entering the venturi tube; the rotation speed of the water pump is regulated, and when the foam ratio of the foam mixed liquid reaches a preset foam proportion gradient value, the current outlet pressure value of the water pump is used as the outlet pressure target value; and performing data fitting by using each water pump inlet pressure value and the corresponding water pump outlet pressure value to obtain the functional relation.
In some embodiments, the plurality of different water pump inlet pressure values are in an arithmetic progression.
In some embodiments, the minimum value of the plurality of different water pump inlet pressure values is 0Bar and the maximum value is 4Bar.
According to a second aspect of embodiments of the present disclosure, there is provided a foam mix control device including: a first treatment module configured to activate the water pump and open the pressure water valve so that water in the reservoir enters the venturi; the second processing module is configured to determine a corresponding foam proportion gradient value according to a preset foam proportion value, and inquire out an outlet pressure target value related to an inlet pressure value of the water pump according to a functional relation corresponding to the foam proportion gradient value; a third processing module configured to adjust a rotational speed of the water pump so that an outlet pressure value of the water pump reaches the outlet pressure target value; a fourth processing module configured to open the foam-sucking proportional valve so that the foam concentrate in the foam pool enters the venturi and mixes with the water in the venturi to generate a foam mixture; and a fifth processing module configured to adjust the opening of the foam sucking proportional valve according to the preset foam proportional value so that the foam ratio of the foam mixture is equal to the preset foam proportional value.
In some embodiments, the fifth processing module is configured to determine a foam ratio of the foam mixture based on a water flow value Q1 at an outlet of the water pump and a raw foam flow value Q2 into the venturi, and if the foam ratio of the foam mixture is less than the preset foam ratio value, increase the opening of the foam suction proportional valve until the foam ratio of the foam mixture is equal to the preset foam ratio value.
In some embodiments, the fifth processing module is configured to decrease the opening of the foam suction proportional valve if the foam ratio of the foam mixture is greater than the preset foam ratio value until the foam ratio of the foam mixture is equal to the preset foam ratio value.
In some embodiments, the froth ratio of the froth mixture is the ratio of the froth raw liquid flow value Q2 to the sum of the water flow value Q1 and the froth raw liquid flow value Q2.
In some embodiments, the apparatus further comprises: a sixth processing module configured to determine a functional relationship between an inlet pressure value of the water pump and an outlet pressure target value of the water pump in the case of a predetermined foam ratio gradient value, wherein a predetermined foam ratio gradient value and a plurality of different water pump inlet pressure values are selected, the water pump is started, the pressure water valve is opened so that water in the reservoir enters the venturi tube, a rotation speed of the water pump is adjusted for each water pump inlet pressure value, a foam suction ratio valve is opened in the case of a negative pressure formed by the venturi tube, an opening degree of the foam suction ratio valve is maximum, a foam ratio of a foam mixture is determined according to a water flow value Q1 at an outlet of the water pump and a foam raw liquid flow value Q2 entering the venturi tube, a rotation speed of the water pump is adjusted, and in the case that the foam ratio of the foam mixture reaches the predetermined foam ratio gradient value, a current water pump outlet pressure value is used as the outlet pressure target value, and data fitting is performed by using each water pump inlet pressure value and the corresponding water pump outlet pressure value to obtain the functional relationship.
In some embodiments, the plurality of different water pump inlet pressure values are in an arithmetic progression.
In some embodiments, the minimum value of the plurality of different water pump inlet pressure values is 0Bar and the maximum value is 4Bar.
According to a third aspect of embodiments of the present disclosure, there is provided a foam mixed liquid control device including: a memory configured to store instructions; a processor coupled to the memory, the processor configured to perform a method according to any of the embodiments described above based on instructions stored in the memory.
According to a fourth aspect of embodiments of the present disclosure, there is provided a foam mix control system comprising: the foam liquid mixture control apparatus as described in any one of the above embodiments; a water pump configured to, after being started according to control of the foam mixed liquid control device, allow water in a reservoir to reach an outlet of the water pump; a pressure water valve configured to allow water at an outlet of the water pump to enter a venturi tube after being opened according to control of the foam mixed liquid control device; a foam sucking proportional valve configured to allow the foam raw liquid in the foam pool to enter the venturi tube after being opened according to the control of the foam mixed liquid control device; a water pump inlet pressure sensor configured to detect an inlet pressure value of the water pump and transmit a detection result to the foam mixed liquid control device; a water pump outlet pressure sensor configured to detect an outlet pressure value of the water pump and send a detection result to the foam mixed liquid control device; a raw foam liquid flow sensor configured to detect a raw foam liquid flow value entering the venturi tube and send a detection result to the foam mixed liquid control device; and the water flow sensor is configured to detect the water flow value at the outlet of the water pump and send the detection result to the foam mixed liquid control device.
In some embodiments, the apparatus further comprises: a venturi pressure sensor configured to detect a pressure of the venturi and transmit a detection result to the foam mixed liquid control device.
According to a fifth aspect of embodiments of the present disclosure, there is provided a fire fighting vehicle comprising a foam mix control system as described in any of the embodiments above.
According to a sixth aspect of embodiments of the present disclosure, there is provided a computer readable storage medium, wherein the computer readable storage medium stores computer instructions which, when executed by a processor, implement a method as in any of the embodiments described above.
Other features of the present disclosure and its advantages will become apparent from the following detailed description of exemplary embodiments of the disclosure, which proceeds with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the solutions in the prior art, the drawings that are required for the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present disclosure, and that other drawings may be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic flow chart of a foam mix control method according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a foam mix control system according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a foam mix control system according to another embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a foam mix control device according to an embodiment of the present disclosure;
FIG. 5 is a schematic view of a foam mix control device according to another embodiment of the present disclosure;
FIG. 6 is a schematic structural view of a foam mix control device according to yet another embodiment of the present disclosure;
FIG. 7 is a schematic diagram of a foam mix control system according to yet another embodiment of the present disclosure;
FIG. 8 is a schematic diagram of a foam mix control system according to yet another embodiment of the present disclosure;
fig. 9 is a schematic structural view of a fire-fighting vehicle according to an embodiment of the present disclosure.
Detailed Description
The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be made by one of ordinary skill in the art without inventive effort, based on the embodiments in this disclosure are intended to be within the scope of this disclosure.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
Fig. 1 is a flow chart of a foam mix control method according to an embodiment of the present disclosure. In some embodiments, the following foam mix control method is performed by a foam mix control device.
At step 101, the water pump is started and the pressure water valve is opened so that water in the reservoir enters the venturi.
Fig. 2 is a schematic structural view of a foam mix control system according to an embodiment of the present disclosure. As shown in fig. 2, the foam mixed liquor control system comprises a water pump 1, a water reservoir 2, a foam pool 3, a venturi tube 4, a foam sucking proportional valve 5, a pressure water valve 6, a water sucking valve 7, a foam raw liquid flow sensor 8, a water pump outlet pressure sensor 9, a water pump inlet pressure sensor 10, a water sucking valve 11, a water flow sensor 12, a water outlet valve 13 and a water gun 14.
In fig. 2, after the water pump 1 is started, water in the reservoir 2 reaches the outlet of the water pump 1. After opening the pressure water valve 6, water at the outlet of the water pump 1 will enter the venturi 4.
In step 102, a corresponding foam scale gradient value is determined from a preset foam scale value.
It should be noted that the foam ratio value of the negative pressure foam system is usually 3% -6%. To ensure margin, a foam ratio gradient value greater than the foam ratio value, for example, 4% -7%, is typically selected.
In step 103, an outlet pressure target value associated with the inlet pressure value of the water pump is queried according to a functional relationship corresponding to the foam proportional gradient value.
For example, if the foam gradient value is 4%, the corresponding functional relationship is P out ＝f(P in ). Whereby according to the inlet pressure value P of the water pump in Determining an associated outlet pressure target value P out 。
In step 104, the rotational speed of the water pump is adjusted so that the outlet pressure value of the water pump reaches the outlet pressure target value.
It should be noted that, when the outlet pressure value of the water pump reaches the outlet pressure target value, it indicates that the venturi tube enters the negative pressure state.
In step 105, the foam-absorbing proportional valve is opened so that the foam concentrate in the foam pool enters the venturi and mixes with the water in the venturi to produce a foam mix.
As shown in fig. 2, in the case where the venturi tube 4 is brought into a negative pressure state, the foam suction proportional valve 5 is opened, and the foam concentrate in the foam pool 3 is brought into the venturi tube 4 and mixed with water in the venturi tube 4 to generate a foam mixture.
In step 106, the opening of the foam sucking proportional valve is adjusted according to the preset foam proportional value so that the foam ratio of the foam mixture is equal to the preset foam proportional value.
That is, the foam ratio of the foam mixture flowing out of gun 14 is equal to the preset foam ratio value.
In some embodiments, the froth ratio of the froth mixture is determined from a flow value Q1 at the outlet of the water pump and a froth raw flow value Q2 into the venturi.
And if the foam ratio of the foam mixed solution is smaller than the preset foam ratio value, increasing the opening of the foam sucking proportional valve until the foam ratio of the foam mixed solution is equal to the preset foam ratio value.
And if the foam ratio of the foam mixed solution is larger than a preset foam ratio value, reducing the opening of the foam sucking proportional valve until the foam ratio of the foam mixed solution is equal to the preset foam ratio value.
In some embodiments, the froth ratio of the froth mixture is the ratio of the froth raw liquid flow value Q2 to the sum of the water flow value Q1 and the froth raw liquid flow value Q2. Namely, the foam ratio R of the foam mixture is: r=q2/(q1+q2).
In the foam mixed liquid control method provided by the embodiment of the disclosure, the preset functional relation is utilized to determine the target value of the outlet pressure of the water pump corresponding to the current inlet pressure value of the water pump, and when the outlet pressure value of the water pump reaches the target value of the outlet pressure, the venturi tube is indicated to enter a negative pressure state, and the foam sucking proportional valve is opened at the moment, so that the foam liquid can be effectively prevented from flowing into the foam tank to cause pollution failure of the foam liquid, the mixing speed of the foam liquid can be accelerated, and the liquid outlet time of the foam mixed liquid can be shortened.
In some embodiments, a functional relationship between the inlet pressure value of the water pump and the outlet pressure target value of the water pump is determined with a predetermined foam proportional gradient value.
Fig. 3 is a schematic structural view of a foam mix control system according to another embodiment of the present disclosure. Fig. 3 is different from fig. 2 in that in the foam mixture control system shown in fig. 3, a venturi pressure sensor 15, a water pump 16 and a reservoir 17 are further included.
It should be noted that, the water in the reservoir 2 may reach the inlet of the water pump 1, and the water pump 16 may also provide the water in the reservoir 17 to the inlet of the water pump 1, so that the water pressure at the inlet of the water pump 1 may be effectively adjusted.
In some embodiments, determining a functional relationship between an inlet pressure value of the water pump and an outlet pressure target value of the water pump comprises the steps of:
1) A preset foam proportional gradient value and a plurality of different water pump inlet pressure values are selected.
It should be noted that the foam ratio value of the negative pressure foam system is usually 3% -6%. To ensure margin, a foam ratio gradient value that is greater than the foam ratio value is typically selected, for example, four gradient values of 4%, 5%, 6% and 7% are used.
In addition, the water pump supplies water in different modes, and the inlet pressure value of the water pump is also different. If water is absorbed from a water tank or reservoir, the inlet pressure of the water pump is close to 0Bar. If a pressurized water supply is used, the pressure of the water supplied to the inlet of the water pump should be not more than 4Bar. I.e. the inlet pressure of the water pump is in the range of 0-4 Bar, and the pressure can be continuously changed.
In some embodiments, the plurality of different water pump inlet pressure values are in an arithmetic progression. For example, the minimum value of the inlet pressure value of the water pump is 0Bar, and the maximum value is 4Bar.
For example, to enable a more accurate function to be obtained, the water pump inlets are respectively supplied with water at a pressure starting from 0Bar and stepping by 0.5Bar until 4Bar ends, i.e. 0Bar, 0.5Bar, 1Bar, 1.5Bar, 2Bar, 2.5Bar, 3Bar, 3.5Bar and 4Bar, for a total of 9 test points.
2) The water pump is started and the pressure water valve is opened so that water in the reservoir enters the venturi.
As shown in fig. 3, the water pumps 1 and 16 are activated and the pressure water valve 6 is opened so that water in the reservoirs 2 and 17 enters the venturi tube 4.
3) And (3) adjusting the rotating speed of the water pump according to the inlet pressure value of each water pump, and opening the foam-sucking proportional valve under the condition that the venturi tube forms negative pressure, wherein the opening of the foam-sucking proportional valve is the largest.
For example, in the case where the water pump inlet pressure value is 0Bar, the rotation speed of the water pump 1 is adjusted, and it is judged whether the venturi 4 forms a negative pressure or not based on the pressure data collected by the venturi pressure sensor 15. The foam-sucking proportional valve 5 is opened in the case where the venturi tube 4 forms a negative pressure, and the opening degree of the foam-sucking proportional valve 5 is set to be maximum.
4) The foam ratio of the foam mixture is determined based on the flow value Q1 at the outlet of the water pump and the foam raw flow value Q2 entering the venturi tube.
In some embodiments, the froth ratio of the froth mixture is the ratio of the froth raw liquid flow value Q2 to the sum of the water flow value Q1 and the froth raw liquid flow value Q2. Namely, the foam ratio R of the foam mixture is: r=q2/(q1+q2).
5) And (3) adjusting the rotating speed of the water pump, and taking the current outlet pressure value of the water pump as an outlet pressure target value under the condition that the foam ratio of the foam mixed liquid reaches a preset foam proportion gradient value.
For example, the foam ratio gradient value is selected to be 4%, the inlet pressure of the water pump 1 is 0Bar, and when the foam ratio of the foam mixture reaches 4%, the current water pump outlet pressure value is taken as the outlet pressure target value A1.
Next, the selected foam ratio gradient value was 4%, the inlet pressure of the water pump 1 was 0.5Bar, and in the case where the foam ratio of the foam mixture reached 4%, the current water pump outlet pressure value was taken as the outlet pressure target value A2. By analogy, in the case of a selected foam ratio gradient value of 4%, if the inlet pressure of the water pump 1 is 0Bar, 0.5Bar, 1Bar, 1.5Bar, 2Bar, 2.5Bar, 3Bar, 3.5Bar and 4Bar, the corresponding outlet pressure target values are A1 to A9, respectively, as shown in table 1.
Next, in the case where the selected foam ratio gradient values are 5%, 6% and 7%, respectively, if the inlet pressure of the water pump 1 is 0Bar, 0.5Bar, 1Bar, 1.5Bar, 2Bar, 2.5Bar, 3Bar, 3.5Bar and 4Bar, the corresponding outlet pressure target values are B1-B9, C1-C9 and D1-D9, respectively, as shown in table 1.
TABLE 1
6) And performing data fitting by using each water pump inlet pressure value and the corresponding water pump outlet pressure value to obtain a functional relation.
For example, as shown in Table 1, in the case of a foam proportional gradient value of 4%, data fitting is performed using the inlet pressure value 0Bar-4Bar of the water pump and the corresponding outlet pressure target values A1-A9 to obtain a corresponding functional relationship P out ＝f(P in ). Similarly, the functional relationship between the inlet pressure value and the corresponding outlet pressure target value of the water pump is obtained under the conditions that the foam proportion gradient values are 5%, 6% and 7% respectively.
Fig. 4 is a schematic structural view of a foam mix control device according to an embodiment of the present disclosure. As shown in fig. 4, the foam mixture control apparatus includes a first process module 41, a second process module 42, a third process module 43, a fourth process module 44, and a fifth process module 45.
The first treatment module 41 is configured to activate the water pump and open the pressure water valve so that water in the reservoir enters the venturi.
The second processing module 42 is configured to determine a corresponding foam proportional gradient value from a preset foam proportional value, and query an outlet pressure target value associated with an inlet pressure value of the water pump from a functional relationship corresponding to the foam proportional gradient value.
It should be noted that the foam ratio value of the negative pressure foam system is usually 3% -6%. To ensure margin, a foam ratio gradient value greater than the foam ratio value, for example, 4% -7%, is typically selected.
For example, if the foamThe ratio gradient value is 4%, and the corresponding function relation is P out ＝f(P in ). Whereby according to the inlet pressure value P of the water pump in Determining an associated outlet pressure target value P out 。
The third processing module 43 is configured to adjust the rotational speed of the water pump such that the outlet pressure value of the water pump reaches the outlet pressure target value.
It should be noted that, when the outlet pressure value of the water pump reaches the outlet pressure target value, it indicates that the venturi tube enters the negative pressure state.
The fourth processing module 44 is configured to open the foam-absorbing proportional valve so that the foam concentrate in the foam pool enters the venturi and mixes with the water in the venturi to produce a foam mix.
The fifth processing module 45 is configured to adjust the opening of the foam suction proportional valve according to a preset foam proportional value so that the foam ratio of the foam mixture is equal to the preset foam proportional value.
In some embodiments, the fifth processing module 45 determines the foam ratio of the foam mixture based on the flow value Q1 at the outlet of the water pump and the raw foam flow value Q2 entering the venturi, and if the foam ratio of the foam mixture is less than the preset foam ratio value, increases the opening of the foam suction proportional valve until the foam ratio of the foam mixture is equal to the preset foam ratio value.
In some embodiments, the fifth processing module 45 decreases the opening of the foam suction proportional valve if the foam ratio of the foam mixture is greater than the preset foam ratio value until the foam ratio of the foam mixture is equal to the preset foam ratio value.
In some embodiments, the froth ratio of the froth mixture is the ratio of the froth raw liquid flow value Q2 to the sum of the water flow value Q1 and the froth raw liquid flow value Q2. Namely, the foam ratio R of the foam mixture is: r=q2/(q1+q2).
In the foam mixed liquid control device provided by the embodiment of the disclosure, the preset functional relation is utilized to determine the target value of the outlet pressure of the water pump corresponding to the current inlet pressure value of the water pump, and when the outlet pressure value of the water pump reaches the target value of the outlet pressure, the venturi tube is indicated to enter a negative pressure state, and the foam sucking proportional valve is opened at the moment, so that the water can be effectively prevented from flowing into the foam tank, the foam liquid pollution failure is caused, the foam liquid mixing speed can be accelerated, and the foam mixed liquid discharging time is shortened.
Fig. 5 is a schematic structural view of a foam mix control device according to another embodiment of the present disclosure. Fig. 5 differs from fig. 4 in that in the embodiment shown in fig. 5, the foam mix control device further comprises a sixth processing module 46.
The sixth processing module 46 is configured to determine a functional relationship between the inlet pressure value of the water pump and the outlet pressure target value of the water pump in the case of a predetermined foam proportional gradient value, wherein:
1) A preset foam proportional gradient value and a plurality of different water pump inlet pressure values are selected.
It should be noted that the foam ratio value of the negative pressure foam system is usually 3% -6%. To ensure margin, a foam ratio gradient value that is greater than the foam ratio value is typically selected, for example, four gradient values of 4%, 5%, 6% and 7% are used.
In addition, the water pump supplies water in different modes, and the inlet pressure value of the water pump is also different. If water is absorbed from a water tank or reservoir, the inlet pressure of the water pump is close to 0Bar. If a pressurized water supply is used, the pressure of the water supplied to the inlet of the water pump should be not more than 4Bar. I.e. the inlet pressure of the water pump is in the range of 0-4 Bar, and the pressure can be continuously changed.
In some embodiments, the plurality of different water pump inlet pressure values are in an arithmetic progression. For example, the minimum value of the inlet pressure value of the water pump is 0Bar, and the maximum value is 4Bar.
For example, to enable a more accurate function to be obtained, the water pump inlets are respectively supplied with water at a pressure starting from 0Bar and stepping by 0.5Bar until 4Bar ends, i.e. 0Bar, 0.5Bar, 1Bar, 1.5Bar, 2Bar, 2.5Bar, 3Bar, 3.5Bar and 4Bar, for a total of 9 test points.
2) The water pump is started and the pressure water valve is opened so that water in the reservoir enters the venturi.
3) And (3) adjusting the rotating speed of the water pump according to the inlet pressure value of each water pump, and opening the foam-sucking proportional valve under the condition that the venturi tube forms negative pressure, wherein the opening of the foam-sucking proportional valve is the largest.
4) The foam ratio of the foam mixture is determined based on the flow value Q1 at the outlet of the water pump and the foam raw flow value Q2 entering the venturi tube.
In some embodiments, the froth ratio of the froth mixture is the ratio of the froth raw liquid flow value Q2 to the sum of the water flow value Q1 and the froth raw liquid flow value Q2. Namely, the foam ratio R of the foam mixture is: r=q2/(q1+q2).
5) And (3) adjusting the rotating speed of the water pump, and taking the current outlet pressure value of the water pump as an outlet pressure target value under the condition that the foam ratio of the foam mixed liquid reaches a preset foam proportion gradient value.
For example, as shown in fig. 3, if the selected foam ratio gradient value is 4%, the inlet pressure of the water pump 1 is 0Bar, and if the foam ratio of the foam mixture reaches 4%, the current water pump outlet pressure value is taken as the outlet pressure target value A1.
Next, the selected foam ratio gradient value was 4%, the inlet pressure of the water pump 1 was 0.5Bar, and in the case where the foam ratio of the foam mixture reached 4%, the current water pump outlet pressure value was taken as the outlet pressure target value A2. By analogy, in the case of a selected foam ratio gradient value of 4%, if the inlet pressure of the water pump 1 is 0Bar, 0.5Bar, 1Bar, 1.5Bar, 2Bar, 2.5Bar, 3Bar, 3.5Bar and 4Bar, the corresponding outlet pressure target values are A1 to A9, respectively, as shown in table 1.
Next, in the case where the selected foam ratio gradient values are 5%, 6% and 7%, respectively, if the inlet pressure of the water pump 1 is 0Bar, 0.5Bar, 1Bar, 1.5Bar, 2Bar, 2.5Bar, 3Bar, 3.5Bar and 4Bar, the corresponding outlet pressure target values are B1-B9, C1-C9 and D1-D9, respectively, as shown in the above table 1.
6) And performing data fitting by using each water pump inlet pressure value and the corresponding water pump outlet pressure value to obtain a functional relation.
For example, as shown in Table 1, in the case of a foam proportional gradient value of 4%, data fitting is performed using the inlet pressure value 0Bar-4Bar of the water pump and the corresponding outlet pressure target values A1-A9 to obtain a corresponding functional relationship P out ＝f(P in ). Similarly, the functional relationship between the inlet pressure value and the corresponding outlet pressure target value of the water pump is obtained under the conditions that the foam proportion gradient values are 5%, 6% and 7% respectively.
Fig. 6 is a schematic structural view of a foam mix control device according to a further embodiment of the present disclosure. As shown in fig. 6, the foam mix control device includes a memory 61 and a processor 62.
The memory 61 is for storing instructions and the processor 62 is coupled to the memory 61, the processor 62 being configured to perform a method as referred to in any of the embodiments of fig. 1 based on the instructions stored by the memory.
As shown in fig. 6, the foam mixture control apparatus further includes a communication interface 63 for information interaction with other devices. Meanwhile, the foam mixture control device further comprises a bus 64, and the processor 62, the communication interface 63 and the memory 61 are in communication with each other through the bus 64.
The memory 61 may comprise a high-speed RAM memory or may further comprise a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 61 may also be a memory array. The memory 61 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules.
Further, the processor 62 may be a central processing unit CPU, or may be an application specific integrated circuit ASIC, or one or more integrated circuits configured to implement embodiments of the present disclosure.
The present disclosure also relates to a computer readable storage medium having stored thereon computer instructions which, when executed by a processor, implement a method as referred to in any of the embodiments of fig. 1.
Fig. 7 is a schematic structural view of a foam mix control system according to yet another embodiment of the present disclosure. As shown in fig. 7, the foam mixed liquor control system includes a foam mixed liquor control device 70, a water pump 1, a pressure water valve 6, a foam suction proportional valve 5, a water pump inlet pressure sensor 10, a water pump outlet pressure sensor 9, a foam raw liquid flow sensor 8 and a water flow sensor 12. The foam concentrate control device 70 is a foam concentrate control device according to any one of the embodiments of fig. 4 to 6. The water pump 1, the pressure water valve 6, the foam suction proportional valve 5, the water pump inlet pressure sensor 10, the water pump outlet pressure sensor 9, the foam raw liquid flow sensor 8 and the water flow sensor 12 are arranged as shown in fig. 2 or 3.
The water pump 1 is configured such that, after being activated according to the control of the foam mixed liquor control device 70, water in the reservoir reaches the outlet of the water pump 1.
The pressure water valve 6 is configured such that after being opened according to the control of the foam mixture control device 70, water at the outlet of the water pump 1 enters the venturi tube 4.
The foam-sucking proportional valve 5 is configured such that, after being opened according to the control of the foam-mixed liquid control device 70, the foam raw liquid in the foam pool enters the venturi tube 4 to mix the foam raw liquid and water in the venturi tube 4 to generate the foam-mixed liquid.
The water pump inlet pressure sensor 10 is configured to detect an inlet pressure value of the water pump 1 and transmit the detection result to the foam mix control device 70.
The pump outlet pressure sensor 9 is configured to detect an outlet pressure value of the pump 1 and send the detection result to the foam liquid mixture control device 70.
The raw foam liquid flow sensor 8 is configured to detect the raw foam liquid flow value entering the venturi tube and send the detection result to the foam mixed liquid control device 70.
The water flow sensor 12 is configured to detect a water flow value at the outlet of the water pump 1 and transmit the detection result to the foam mix control device 70.
Fig. 8 is a schematic structural view of a foam mix control system according to yet another embodiment of the present disclosure. Fig. 8 differs from fig. 7 in that in the embodiment shown in fig. 8, the foam mix control system further comprises a venturi pressure sensor 11. The venturi pressure sensor 11 is arranged as shown in fig. 3.
The venturi pressure sensor 11 is configured to detect the pressure of the venturi and transmit the detection result to the foam mix control device 70.
Fig. 9 is a schematic structural view of a fire-fighting vehicle according to an embodiment of the present disclosure. As shown in fig. 9, the fire-fighting vehicle 90 includes a foam mix control system 91, and the foam mix control system 91 is the foam mix control system shown in any one of the embodiments of fig. 2, 3, 7, or 8.
By implementing the above embodiments of the present disclosure, the following advantageous effects can be obtained:
1) The foam liquid mixing speed can be accelerated, the foam liquid mixing time can be shortened, and the fire extinguishing efficiency can be improved;
2) The foam liquid pollution control device can effectively prevent foam liquid from polluting and failing due to the fact that water flows into the foam tank;
3) The method and the device do not need to add new components and parts, do not increase the cost of the vehicle, and do not influence the reliability of the vehicle.
In some embodiments, the functional units described above may be implemented as general-purpose processors, programmable logic controllers (Programmable Logic Controller, abbreviated as PLCs), digital signal processors (Digital Signal Processor, abbreviated as DSPs), application specific integrated circuits (Application Specific Integrated Circuit, abbreviated as ASICs), field programmable gate arrays (Field-Programmable Gate Array, abbreviated as FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof for performing the functions described in the present disclosure.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program for instructing relevant hardware, where the program may be stored in a computer readable storage medium, and the storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (17)
1. A foam mixture control method, performed by a foam mixture control apparatus, comprising:
in the case of a predetermined foam proportional gradient value, determining a functional relationship between an inlet pressure value of a water pump and an outlet pressure target value of the water pump so as to query the outlet pressure target value for bringing the venturi into a negative pressure state from the inlet pressure value of the water pump using the functional relationship corresponding to the foam proportional gradient value, wherein determining the functional relationship comprises: selecting a preset foam proportion gradient value and a plurality of different water pump inlet pressure values, starting the water pump, opening the pressure water valve so that water in the reservoir enters the venturi tube, adjusting the rotating speed of the water pump according to each water pump inlet pressure value, opening a foam suction proportion valve under the condition that the venturi tube forms negative pressure, determining the foam ratio of foam mixed liquid according to the water flow value Q1 at the outlet of the water pump and the foam raw liquid flow value Q2 entering the venturi tube, adjusting the rotating speed of the water pump, taking the current water pump outlet pressure value as the outlet pressure target value under the condition that the foam ratio of the foam mixed liquid reaches the preset foam proportion gradient value, and performing data fitting by utilizing each water pump inlet pressure value and the corresponding water pump outlet pressure value to obtain the functional relation;
Starting the water pump and opening the pressure water valve so that water in the reservoir enters the venturi tube;
determining a corresponding foam proportion gradient value according to a preset foam proportion value;
inquiring an outlet pressure target value related to an inlet pressure value of the water pump according to a functional relation corresponding to the foam proportion gradient value;
adjusting the rotating speed of the water pump so that the outlet pressure value of the water pump reaches the outlet pressure target value, and enabling the venturi tube to enter a negative pressure state;
opening a foam sucking proportional valve so that foam stock solution in a foam pool enters the venturi tube and is mixed with water in the venturi tube to generate foam mixed solution;
and adjusting the opening of the foam sucking proportional valve according to the preset foam proportional value so that the foam ratio of the foam mixed solution is equal to the preset foam proportional value.
2. The method of claim 1, wherein adjusting the opening of the foam-absorbing proportional valve according to the preset foam proportional value comprises:
determining the foam ratio of the foam mixed liquid according to a water flow value Q1 at the outlet of the water pump and a foam raw liquid flow value Q2 entering the venturi tube;
And if the foam ratio of the foam mixed solution is smaller than the preset foam ratio value, increasing the opening of the foam sucking proportional valve until the foam ratio of the foam mixed solution is equal to the preset foam ratio value.
3. The method of claim 2, further comprising:
and if the foam ratio of the foam mixed solution is larger than the preset foam ratio value, reducing the opening of the foam sucking proportional valve until the foam ratio of the foam mixed solution is equal to the preset foam ratio value.
4. The method of claim 2, wherein,
the foam ratio of the foam mixed liquid is the ratio of the foam raw liquid flow value Q2 to the sum of the water flow value Q1 and the foam raw liquid flow value Q2.
5. The method according to any one of claims 1 to 4, wherein,
the plurality of different water pump inlet pressure values are in an arithmetic progression.
6. The method of claim 5, wherein,
the minimum value of the plurality of different water pump inlet pressure values is 0Bar, and the maximum value is 4Bar.
7. A foam mix control device comprising:
a sixth processing module configured to determine a functional relationship between an inlet pressure value of a water pump and an outlet pressure target value of the water pump in case of a predetermined foam ratio gradient value, so as to query the outlet pressure target value of the venturi tube into a negative pressure state according to the inlet pressure value of the water pump using the functional relationship corresponding to the foam ratio gradient value, wherein a preset foam ratio gradient value and a plurality of different inlet pressure values of the water pump are selected, the water pump is started, the pressure water valve is opened so that water in the reservoir enters the venturi tube, a rotation speed of the water pump is adjusted for each inlet pressure value of the water pump, the foam suction ratio valve is opened in case of a negative pressure being formed by the venturi tube, an opening degree of the foam suction ratio valve is maximum, a foam ratio of a foam mixture is determined according to a water flow value Q1 at an outlet of the water pump and a foam raw flow value Q2 entering the venturi tube, a rotation speed of the water pump is adjusted, and when the foam ratio of the foam mixture reaches the preset foam ratio gradient value, a current outlet pressure value of the water pump is used as the outlet pressure target value, the water pump and the corresponding outlet pressure value is used to perform fitting function;
A first treatment module configured to activate the water pump and open the pressure water valve so that water in the reservoir enters the venturi;
the second processing module is configured to determine a corresponding foam proportion gradient value according to a preset foam proportion value, and inquire out an outlet pressure target value related to an inlet pressure value of the water pump according to a functional relation corresponding to the foam proportion gradient value;
a third processing module configured to adjust a rotational speed of the water pump so that an outlet pressure value of the water pump reaches the outlet pressure target value, so that the venturi tube enters a negative pressure state;
a fourth processing module configured to open the foam-sucking proportional valve so that the foam concentrate in the foam pool enters the venturi and mixes with the water in the venturi to generate a foam mixture;
and a fifth processing module configured to adjust the opening of the foam sucking proportional valve according to the preset foam proportional value so that the foam ratio of the foam mixture is equal to the preset foam proportional value.
8. The apparatus of claim 7, wherein,
the fifth processing module is configured to determine a foam ratio of the foam mixed liquid according to a water flow value Q1 at the outlet of the water pump and a foam raw liquid flow value Q2 entering the venturi tube, and if the foam ratio of the foam mixed liquid is smaller than the preset foam ratio value, increasing the opening of the foam sucking proportional valve until the foam ratio of the foam mixed liquid is equal to the preset foam ratio value.
9. The apparatus of claim 8, wherein,
the fifth processing module is configured to reduce the opening of the foam sucking proportional valve if the foam ratio of the foam mixture is greater than the preset foam ratio value until the foam ratio of the foam mixture is equal to the preset foam ratio value.
10. The apparatus of claim 8, wherein,
the foam ratio of the foam mixed liquid is the ratio of the foam raw liquid flow value Q2 to the sum of the water flow value Q1 and the foam raw liquid flow value Q2.
11. The device according to any one of claims 7-10, wherein,
the plurality of different water pump inlet pressure values are in an arithmetic progression.
12. The apparatus of claim 11, wherein,
the minimum value of the plurality of different water pump inlet pressure values is 0Bar, and the maximum value is 4Bar.
13. A foam mix control device comprising:
a memory configured to store instructions;
a processor coupled to the memory, the processor configured to perform the method of any of claims 1-6 based on instructions stored by the memory.
14. A foam mix control system comprising:
A foam mix control device as defined in any one of claims 7 to 13;
a water pump configured to, after being started according to control of the foam mixed liquid control device, allow water in a reservoir to reach an outlet of the water pump;
a pressure water valve configured to allow water at an outlet of the water pump to enter a venturi tube after being opened according to control of the foam mixed liquid control device;
a foam sucking proportional valve configured to allow the foam raw liquid in the foam pool to enter the venturi tube after being opened according to the control of the foam mixed liquid control device;
a water pump inlet pressure sensor configured to detect an inlet pressure value of the water pump and transmit a detection result to the foam mixed liquid control device;
a water pump outlet pressure sensor configured to detect an outlet pressure value of the water pump and send a detection result to the foam mixed liquid control device;
a raw foam liquid flow sensor configured to detect a raw foam liquid flow value entering the venturi tube and send a detection result to the foam mixed liquid control device;
and the water flow sensor is configured to detect the water flow value at the outlet of the water pump and send the detection result to the foam mixed liquid control device.
15. The system of claim 14, further comprising:
a venturi pressure sensor configured to detect a pressure of the venturi and transmit a detection result to the foam mixed liquid control device.
16. A fire fighting vehicle comprising the foam mix control system of claim 14 or 15.
17. A non-transitory computer readable storage medium storing computer instructions which, when executed by a processor, implement the method of any one of claims 1-6.
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| CN202210998223.6A CN115337578B (en) | 2022-08-19 | 2022-08-19 | Foam mixed liquid control method, device and system, fire-fighting vehicle and storage medium |
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| CN201529337U (en) * | 2009-11-06 | 2010-07-21 | 徐州重型机械有限公司 | Fire-fighting foam mixing ratio control system and fire engine with same |
| CN102053631A (en) * | 2009-11-06 | 2011-05-11 | 徐州重型机械有限公司 | Fire-fighting foam mixing ratio control method, system and fire-fighting truck provided therewith |
| CN202005970U (en) * | 2011-03-24 | 2011-10-12 | 李春旭 | Integrated control system for fire trucks |
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| US6991041B2 (en) * | 2003-02-28 | 2006-01-31 | Hale Products, Inc. | Compressed air foam pumping system |
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| US4729434A (en) * | 1986-04-28 | 1988-03-08 | Rohrbach Jerry T | Portable fire-fighting apparatus |
| CN201529337U (en) * | 2009-11-06 | 2010-07-21 | 徐州重型机械有限公司 | Fire-fighting foam mixing ratio control system and fire engine with same |
| CN102053631A (en) * | 2009-11-06 | 2011-05-11 | 徐州重型机械有限公司 | Fire-fighting foam mixing ratio control method, system and fire-fighting truck provided therewith |
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