CN115569336A - Fire monitor mechanism design and method thereof - Google Patents
Fire monitor mechanism design and method thereof Download PDFInfo
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- CN115569336A CN115569336A CN202211176213.0A CN202211176213A CN115569336A CN 115569336 A CN115569336 A CN 115569336A CN 202211176213 A CN202211176213 A CN 202211176213A CN 115569336 A CN115569336 A CN 115569336A
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The invention relates to a fire monitor mechanism design and a method thereof, which comprises a nozzle, a monitor tube support, a central main shaft, a movable platform, a support rod, a rocker, a worm gear, a bearing support, a worm gear shaft rack and a motor, wherein the monitor tube is connected with the central main shaft into a whole under the fixation of the monitor tube support, the motor drives an upper worm gear, the upper worm gear rotates together with the central shaft to drive the monitor tube and the nozzle to rotate for 360 degrees, one of the horizontal rotation motions of the fire monitor during working is realized, simultaneously, the motor drives a lower worm gear to further drive a lower worm gear, a threaded hole for installing a pin is formed in the lower worm gear, a groove for opening the bearing is formed in the lower rocker, the pin is installed in the threaded hole of the worm gear to further be matched with the bearing in the lower rocker, when the lower worm gear rotates, the pin forces the lower rocker to perform reciprocating swing within a certain angle range, and the lower rocker pulls down or pushes the upper rocker upwards. Has the advantages that: the fire extinguishing gun improves the fire extinguishing range of the fire extinguishing gun, increases the reaction agility of fire extinguishing, and practically improves the fire extinguishing efficiency.
Description
Technical Field
The invention relates to the technical field of fire-fighting appliance design methods, in particular to a fire monitor mechanism design and a fire monitor mechanism design method.
Background
The fire water monitor is one of the most widely used fire extinguishing equipments in fire fighting practice, which enables the fire fighter to stand far away from the radiation heat, explosion hazard and toxic dense smoke area in the fire scene for fire extinguishing, and meanwhile, the fire water monitor not only has high fire extinguishing efficiency, but also has great power, thereby being widely used on a mobile fire truck, a fire ship or conventional fire extinguishing equipment. In some areas where malignant regional fires are likely to occur, such as petrochemical industry, airports, docks, etc., fire monitors also play an irreplaceable role.
The fire monitor has the characteristics of large flow, long range, stable and reliable work and the like, and becomes one of the most widely applied fire extinguishing devices in fire fighting practice. The traditional fire monitor has a plurality of bends due to the structure of the monitor body, so that the water flow energy loss directly influences the firing range of the fire monitor, the energy consumption is increased, the fire extinguishing efficiency is reduced, and the common traditional fire monitor mainly comprises an inlet connecting accessory, a monitor body and an injection part. The gun body realizes the change of the spraying direction by adjusting the selection of the horizontal direction and the pitching motion of the vertical direction. However, in the conventional gun body, a plurality of sections of bent pipelines are connected in series, the positions of two adjacent bent pipes are changed by worm and gear transmission, and the change of the injection direction is realized by the rotation of the bent pipes. The fire monitor with the serial structure forms larger resistance to water flow due to the bending of the monitor body, so that the pressure loss directly influences the range, the energy consumption is increased, and the fire extinguishing efficiency is reduced.
Disclosure of Invention
The invention aims to provide a fire monitor mechanism design and a method thereof, which solve the technical problems that a pipeline is large in hydraulic resistance and large in fire monitor range, energy consumption is increased, and fire extinguishing efficiency is reduced, and are realized through the following scheme.
In order to achieve the above purpose, the invention adopts the technical scheme that: a fire monitor mechanism design is characterized by comprising a nozzle, a monitor tube support, a central main shaft, a movable platform, a supporting rod, a rocker, a worm gear, a bearing support, a worm gear shaft rack and a motor, wherein the monitor tube is connected with the central main shaft into a whole under the fixation of the monitor tube support, the motor drives an upper worm, the upper worm gear rotates together with the central shaft to drive the monitor tube and the nozzle to rotate 360 degrees, one of the horizontal rotation motions of the fire monitor during working is realized, the motor drives a lower worm to further drive a lower worm gear, a threaded hole for installing a pin is formed in the lower worm gear, a groove for opening the bearing is formed in the lower rocker, the pin is installed in the threaded hole of the worm gear to further match with the bearing in the lower rocker, when the lower worm gear rotates, the pin forces the lower rocker to perform reciprocating swing within a certain angle range, the lower rocker pulls down or upwards pushes the upper rocker, the upper rocker drives the movable platform to perform pitching motion in the vertical direction
A design method of a fire monitor mechanism is characterized by comprising a fire interface, a main flow path and a nozzle diameter; the fire-fighting interface is any one of an inner buckle type, a bayonet type and a thread type;
the inner diameter of a flow channel in the main flow path is generally a circular pipeline with a uniform section;
the structure of nozzle includes runner shape, whole length and import and export diameter size, and after the rated flow and the rated operating pressure of fire gun confirmed, because the water jet need can reach the range requirement with certain efflux speed, consequently the export diameter of nozzle is corresponding to definite, and the size of nozzle diameter corresponds with the size of fire gun's ability of overflowing under certain operating pressure, and operating pressure is unchangeable, and the water spray flow increases along with the diameter increase of nozzle, and the export speed of fire gun nozzle can be according to following calculation:
wherein: v out : nozzle water flow exit velocity, m/s;
g is the gravity acceleration of 9.8m/s;
H 1 the conversion relation between the pressure and the pressure water head is 1MPa, which is equivalent to 100m;
relationship of fire monitor flow to nozzle exit area:
Q＝A 0 V out
in the formula, Q is the flow of the water cannon, L/s: a. The 0 Is the cross-sectional area of the outlet of the nozzle, mm 2 ；
Nozzle exit area calculation:
in the formula d 0 Is the diameter of the nozzle outlet, mm;
in conclusion, the nozzle diameter expression is finished:
the rated working pressure of the fire monitor is 1MPa, the pressure loss of water flow in the straight pipe flow channel is 0.0125MPa, and meanwhile, the water flow reaches the vertical height of the straight pipe flow channel inlet from the ground and needs energy to cause pressure loss, so that the final inlet pressure of the nozzle is as follows:
P 1 ＝P forehead (D) -ΔP 1 -ρgh×10 -6
In the formula: p 1 Is the nozzle inlet pressure, MPa; p Forehead (forehead) The pressure is the rated working pressure of the fire monitor, and is MPa;
p is the density of water, 1000Kg/m 3 ；
h is the height of the fire monitor moving platform, 0.65m,
calculating to obtain:
by comparison
And judging whether the water flow is turbulent flow or slow flow.
Further, the entrance velocity of the gun barrel flow channel is also included, and the following can be known from the continuity of the fluid:
in the formula: v. of m Is the inlet speed of the water cannon barrel flow passage, m/s, A 1 Is the cross section area of the water cannon barrel flow passage inlet in mm 2 ；
The cross section area of the gun barrel flow channel is calculated according to the following formula:
in the formula: d 1 The diameter of the flow passage is mm;
the inlet speed of the water cannon can be calculated as follows:
further, the nozzle is any one of a low-pressure nozzle, a hollow conical nozzle and a streamline nozzle, the streamline nozzle is provided with a flow channel generatrix which is similar to a function graph of a tangent function from-pi/2 to pi/2 on an x axis, and the flow channel generatrix is expressed by the following equation:
x is the value of the projection of the point on the flow path generatrix onto the x axis of the coordinate, d 1 Is the diameter at the fluid inlet of the nozzle, d 0 Is the diameter of the nozzle outlet, beta is the size of the flow channel angle, and the value is between 0 and 85 degrees, y is the value of the point on the flow channel projected on the y coordinate axis, and H is the nozzle length.
Furthermore, the fire-fighting connector also comprises a sealing ring sleeve made of aluminum alloy, one end of the sealing ring sleeve is provided with a groove, the other end of the sealing ring sleeve is used for connecting a water hose, and the circular convex part on the fire-fighting connector is connected with the groove.
The invention has the technical effects that:
1. the fire extinguishing system of the fire monitor is analyzed, and the performance parameters and the structural parameters of the fire monitor are determined according to the national relevant standards and the product information on the market. Through mechanism innovation and combination of relevant theoretical knowledge of mechanical design, a series-parallel mechanism which meets two rotational degrees of freedom required by the fire monitor during working, namely the fire monitor based on a parallel structure, is designed, and a straight pipe flow channel is successfully applied to the fire monitor. The stress of the fire monitor tube wall is checked and verified by using a third strength theory;
2. aiming at the optimal length value of the streamline nozzle of the fire monitor, the influence of streamline nozzles with different lengths on the jet performance of the fire monitor is simulated by adopting a Fluent numerical simulation method, and the optimal length value range is obtained by analyzing the speed, pressure and the turbulent kinetic energy physical change rule of the jet of the nozzle. After the length value is determined, a nozzle solid section model is established by adopting three-dimensional modeling software, and coordinate values corresponding to different angles of a nozzle flow channel bus are obtained by utilizing Matlab calculation. Selecting the material of the nozzle by analyzing the spraying medium, the abrasion degree and the like of the nozzle of the fire monitor;
3. the fire monitor with the traditional serial structure and the fire monitor based on the parallel structure designed by the project are taken as research objects, the flow passage pressure drop and the jet flow recoil force of the fire monitor with the traditional serial structure and the fire monitor based on the parallel structure are calculated by using relevant hydraulics theory knowledge, and the flow passage pressure field of the fire monitor and the jet flow recoil force are subjected to simulation analysis by using Fluent software, so that the hydraulic performance superiority of the fire monitor with the parallel structure is verified.
Drawings
FIG. 1 is a front view of the fire monitor mechanism of the present invention;
FIG. 2 is a left side view of the fire monitor mechanism of the present invention;
FIG. 3 is a flow bus bar of a functional diagram of a streamlined nozzle of the present invention;
FIG. 4 is a cross-sectional view of a streamlined nozzle of the present invention;
fig. 5 is a table of the range of pitch angles for different modes of use of the fire monitor of the present invention.
Reference numeral, 1-barrel; 2-gun barrel support; 3, a motor; 4-upper worm; 5-upper worm gear; 6-lower worm; 7-lower worm gear; 8-lower rocker; 9-upper rocker.
Detailed Description
Referring to attached figures 1-4, a fire monitor mechanism design is characterized by comprising a nozzle, a monitor tube support, a central spindle, a movable platform, a support rod, a rocker, a worm gear, a bearing support, a worm gear shaft rack and a motor, wherein the monitor tube 1 is connected with the central spindle into a whole under the fixation of the monitor tube support 2, the motor 3 drives an upper worm 4, an upper worm wheel 5 rotates together with the central spindle to drive the monitor tube 1 and the nozzle to rotate for 360 degrees, one of the horizontal rotation motions of the fire monitor during working is realized, meanwhile, the motor 3 drives a lower worm 6 to further drive a lower worm wheel 7, a threaded hole for installing a pin is formed in the lower worm wheel 7, a groove for releasing the bearing is formed in the lower rocker 8, the pin is installed in the threaded hole of the worm wheel to further be matched with the bearing in the lower rocker 8, when the lower worm wheel 7 rotates, the pin forces the lower rocker 8 to reciprocate in a certain angle range, the lower rocker 8 pulls or pushes the upper rocker 9 upwards, and the upper rocker 9 drives the movable platform to perform pitching motion in the vertical direction
A design method of a fire monitor mechanism is characterized by comprising a fire-fighting interface, a main flow path and a nozzle diameter; the fire-fighting interface is any one of an inner buckle type, a bayonet type and a thread type;
the inner diameter of a flow channel in the main flow path is generally a circular pipeline with a uniform cross section;
the structure of nozzle includes runner shape, overall length and exit diameter size, and after the rated flow and the rated operating pressure of fire monitor confirmed, because the water jet need just can reach the range requirement with certain jet velocity, consequently the exit diameter of nozzle is corresponding to definite, and the size of nozzle diameter corresponds with the size of fire monitor ability of overflowing under certain operating pressure, and operating pressure is unchangeable, and the water spray flow increases along with the diameter increase of nozzle, and the exit velocity of fire monitor nozzle can be according to following calculation:
wherein: v out : nozzle water flow outlet speed, m/s;
g is the gravity acceleration of 9.8m/s;
H 1 the pressure head at the outlet of the nozzle, namely the pressure potential energy of water flow, m, and the conversion relation between the pressure and the pressure head is 1MPa, which is equivalent to 100m;
relationship of fire monitor flow to nozzle exit area:
Q＝A 0 V out
in the formula, Q is the flow of the water cannon, L/s: a. The 0 Is the cross-sectional area of the outlet of the nozzle, mm 2 ；
Nozzle exit area calculation:
in the formula d 0 Is the diameter of the nozzle outlet, mm;
in conclusion, the nozzle diameter expression is finished:
the rated working pressure of the fire monitor is 1MPa, the pressure loss of water flow in the straight pipe flow channel is 0.0125MPa, and meanwhile, the water flow reaches the vertical height of the straight pipe flow channel inlet from the ground and needs energy to cause pressure loss, so that the final inlet pressure of the nozzle is as follows:
P 1 ＝P forehead (forehead) -ΔP 1 -ρgh×10 -6
In the formula: p 1 Is the nozzle inlet pressure, MPa; p is Forehead (forehead) The pressure is the rated working pressure of the fire monitor, and is MPa;
p is the density of water, 1000Kg/m 3 ；
h is the height of the fire monitor moving platform, 0.65m,
calculating to obtain:
by comparison
And judging whether the water flow is turbulent flow or slow flow.
The specific embodiment of the scheme is that the method further comprises the inlet speed of the gun barrel flow channel, and the inlet speed can be known from the continuity of the fluid:
in the formula: v. of m Is the inlet speed of the water cannon barrel flow passage, m/s, A 1 Is the cross section area of the water cannon barrel flow passage inlet in mm 2 ；
The cross-sectional area of the gun barrel flow channel is calculated by the following formula:
in the formula: d is a radical of 1 The diameter of the flow passage is mm;
the inlet speed of the water cannon can be calculated as follows:
the specific embodiment of the scheme is that the nozzle is any one of a low-pressure nozzle, a hollow conical nozzle and a streamline nozzle, the streamline nozzle is provided with a flow channel bus similar to a function graph of a tangent function from-pi/2 to pi/2 on an x axis, and the flow channel bus is represented by the following equation:
x is the value of the projection of the point on the flow path generatrix onto the x axis of the coordinate, d 1 Is the diameter at the fluid inlet of the nozzle, d 0 Is the diameter of the nozzle outlet, beta is the size of the flow channel angle, and the value is between 0 and 85 degrees, y is the value of the point on the flow channel projected on the y coordinate axis, and H is the nozzle length.
The specific embodiment of the scheme is that the fire-fighting connector further comprises a sealing ring sleeve made of aluminum alloy, one end of the sealing ring sleeve is provided with a groove, the other end of the sealing ring sleeve is used for connecting a water hose, and a circular raised part on the fire-fighting connector is connected with the groove.
The specific embodiment of the scheme is that the design performance index parameters of the fire monitor mainly comprise the working flow, the working pressure, the firing range and the pitch angle of the water monitor. Only if the parameters are correctly selected, the designed fire monitor can be guaranteed to meet the working requirements.
(1) Working flow
When the fire monitor works, under the action of pressurization of a fire monitor pump, water flow enters from the runner port and is sprayed into the air from the nozzle port. The amount of water jet flow is mainly related to the jet time, the working pressure and the diameter of the nozzle. Under the condition of working pressure, the volume of the water flow sprayed out of the nozzle in unit time is the working flow, the unit is L/s, and the volume can also be expressed by L/min. Therefore, under the condition of a certain working pressure, the larger the diameter of the nozzle is, the larger the working flow rate is. Conversely, the nozzle diameter is fixed, and the working pressure is higher, the working flow is higher. Generally, the fire extinguishing efficiency is continuously improved along with the increase of the flow.
(2) Operating pressure
The fire monitor pump is a special pump for conveying liquid fire extinguishing agents such as water or other foam solutions, and when the fire monitor works, the pressure which can be provided by the fire monitor pump at the outlet is working pressure and is also the pressure at the inlet of the fire monitor injection pipe, and the unit is MPa. There is a certain difference between the operating pressure and the pressure at the nozzle outlet. Because when the fluid flows in the flow channel, friction is generated between the fluid and the inner wall and between fluid layers to cause energy loss, and the pressure loss caused by different flowing states of the fluid in the flow channel is different. Therefore, improving the smoothness of the inner wall of the flow channel and reducing the turbulence intensity of the fluid are the main methods for reducing the pressure loss.
(3) Fire monitor shooting range
The range generally refers to the horizontal range that a fire monitor can reach at an elevation angle of 30 degrees, and is mainly influenced by factors such as working pressure, flow, elevation angle of the fire monitor, external working environment and the like. The range of the water cannon is determined mainly according to the distance between the water cannon and the protected object and the height of the protected object. When the working pressure of the fire-fighting water bubbles is designed according to actual requirements, the working pressure is found to be inconsistent with the rated working pressure, and the actual working pressure should not exceed the specified range. The design range of the fire water monitor can be determined according to the following calculation formula:
wherein:
D S : the design range of the water cannon, m;
D SO : the range m of the water cannon under the rated working pressure state;
P e : the design working pressure of the water cannon is MPa;
P o : rated working pressure of the water cannon is MPa.
The design flow parameter of the water cannon is calculated according to the following formula:
wherein:
Q S : the design flow of the water cannon is L/s;
Q S0 : rated flow of the water cannon, L/s.
(4) Pitch angle of water cannon
The pitch angle of the water monitor refers to the range of the pitch angle of the fire monitor in the vertical direction when the fire monitor rotates in the horizontal direction during working. The larger the pitch angle of the water cannon is, the larger the working range is, but the range of the pitch angle is required to be different due to different using modes. Traditional fire monitor mainly relies on the worm gear who installs on crooked big gun barrel body to realize different pitch angles.
As can be seen from the attached figure 5 in the specification, the fire water monitor has different using modes, the horizontal height of the nozzle from the ground is different, so the minimum depression angle and the maximum elevation angle required by the fire water monitor are different, and the horizontal rotation angle also has different requirements.
The specific embodiment of the scheme is that the main flow path of the fire water monitor refers to the inner diameter of a flow channel from the inlet of the monitor tube to the water outlet. The inner diameter of the flow passage is generally a circular pipeline with a uniform section. A plurality of curves exist in a flow channel of a traditional fire monitor, so that a section path is changed sharply, friction of water flow on the inner wall of the flow channel is increased, and the on-way pressure loss is increased. When water flows through a bend, the curvature radius of the bend is small, and the section change is rapid, so that the water flow generates local turbulence and causes local resistance loss. The main flow path of the fire water monitor corresponds to the fire-fighting interface, so that after the fire-fighting interface is determined, the size of the main flow path is correspondingly determined. The diameter of the circular flow channel is expressed in mm, and the equivalent diameter is used for expressing the non-circular flow channel.
The specific embodiment of the scheme is that the structure of the nozzle mainly comprises three parts: the shape of the flow passage, the overall length and the diameter of the inlet and the outlet. The fire pump provides the effect of certain pressure, and rivers get into the barrel runner with certain flow, and the final arrival nozzle export sprays in the air with the form of water column after through whole runner. After the rated flow and the rated working pressure of the fire monitor are determined, the water jet needs to reach the range requirement at a certain jet speed, so that the diameter of the outlet of the nozzle is correspondingly determined. The diameter of the nozzle corresponds to the flow capacity of the fire monitor under certain working pressure, the working pressure is unchanged, and the water spraying flow is increased along with the increase of the diameter of the nozzle.
The specific embodiment of the scheme is that the laminar flow refers to stable axial motion of fluid, the flow lines are well-arranged and not mixed with each other, and fluid particles do not generate transverse motion perpendicular to the main flow direction. Turbulent flow corresponds to laminar flow, which means that fluid does not move regularly and has the characteristics of complexity, irregularity and randomness. The laminar and turbulent flow can be defined by a parameter R e I.e. the value of Reynolds number, the Reynolds number is determined by a large number of experiments to obtain the lower critical Reynolds number R e =2320, upper critical reynolds number R e ＝13800
When the temperature is higher than the set temperature
When the fluid state is laminar flow(ii) a When in use
When the utility model is used, the water is discharged,
the fluid state is a transition flow. Since 2320 is generally difficult to achieve, 2000 is taken as the value of the lower critical reynolds number. The difference of different values of the experimental conditions is large, so the upper critical reynolds number has no practical significance, and the lower reynolds number is used as the judgment basis of laminar flow and turbulent flow.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. The utility model provides a fire monitor mechanism design, a serial communication port, include by the nozzle, the barrel support, central main shaft, move the platform, the bracing piece, the rocker, the worm gear, the bearing support, worm-gear shaft frame and motor constitute, the barrel is linked together with central main shaft under the fixed of barrel support, the motor drives the worm, it rotates with the center pin to go up the worm, it drives the barrel and carries out 360 rotations with the nozzle to go up the worm wheel, realize one of them horizontal rotation motion of fire monitor during operation, the motor drives the worm and then drives lower worm wheel simultaneously, it has the screw hole of dress round pin to open in the lower worm wheel, and open the groove of open bearing in the lower rocker, install the round pin in the screw hole of worm wheel and then cooperate with the bearing in the lower rocker, when lower worm wheel rotated, the round pin forces lower rocker to carry out reciprocal sway in certain angle range, lower rocker is the lower rocker is drawn or is upwards promoted the rocker, upper rocker drives the platform and carries out luffing motion in the vertical direction.
2. A design method of a fire monitor mechanism is characterized by comprising a fire interface, a main flow path and a nozzle diameter; the fire-fighting interface is any one of an inner buckle type, a bayonet type and a thread type;
the inner diameter of a flow channel in the main flow path is generally a circular pipeline with a uniform cross section;
the structure of nozzle includes runner shape, overall length and exit diameter size, and after the rated flow and the rated operating pressure of fire monitor confirmed, because the water jet need just can reach the range requirement with certain jet velocity, consequently the exit diameter of nozzle is corresponding to definite, and the size of nozzle diameter corresponds with the size of fire monitor ability of overflowing under certain operating pressure, and operating pressure is unchangeable, and the water spray flow increases along with the diameter increase of nozzle, and the exit velocity of fire monitor nozzle can be according to following calculation:
wherein: v out : nozzle water flow outlet speed, m/s;
g is the gravity acceleration of 9.8m/s;
H 1 the pressure head at the outlet of the nozzle, namely the pressure potential energy of water flow, m, and the conversion relation between the pressure and the pressure head is 1MPa, which is equivalent to 100m;
relationship of fire monitor flow to nozzle exit area:
Q＝A 0 V out
in the formula, Q is the flow of the water cannon, L/s: a. The 0 Is the cross-sectional area of the outlet of the nozzle, mm 2 ；
Nozzle exit area calculation:
in the formula d 0 Is the diameter of the nozzle outlet, mm;
in conclusion, the nozzle diameter expression is finished:
the rated working pressure of the fire monitor is 1MPa, the pressure loss of water flow in the straight pipe flow channel is 0.0125MPa, and meanwhile, the water flow reaches the vertical height of the straight pipe flow channel from the ground and needs energy to cause pressure loss, so that the final inlet pressure of the nozzle is as follows:
P 1 ＝P forehead (forehead) -ΔP 1 -ρgh×10 -6
In the formula: p is 1 Is the nozzle inlet pressure, MPa; p Forehead (D) The pressure is the rated working pressure of the fire monitor, and is MPa;
p is the density of water, 1000Kg/m 3 ；
h is the height of the fire monitor moving platform, 0.65m,
calculating to obtain:
by comparison
And judging whether the water flow is turbulent flow or slow flow.
3. The method of claim 2, further comprising an entry velocity of the barrel flow path, as determined by the continuity of the fluid:
in the formula: v. of m Is the inlet speed of the water cannon barrel flow passage, m/s, A 1 Is the cross section area of the water cannon barrel flow passage inlet in mm 2 ；
The cross-sectional area of the gun barrel flow channel is calculated by the following formula:
in the formula: d 1 Is the drift diameter of the flow channel, mm;
the inlet speed of the water cannon can be calculated as follows:
4. the method of claim 2, wherein the nozzle is any one of a low pressure nozzle, a hollow cone nozzle, and a streamline nozzle, the streamline nozzle has a flow path generatrix similar to a function diagram of a tangent function from-pi/2 to pi/2 on the x-axis, and the flow path generatrix is expressed by the following equation:
x is the value of the projection of the point on the flow path generatrix onto the x axis of the coordinate, d 1 Is the diameter at the fluid inlet of the nozzle, d 0 The diameter of the outlet of the nozzle, beta is the size of the flow channel angle and is between 0 and 85 degrees, y is the value of the point on the flow channel projected on the y coordinate axis, and H is the length of the nozzle.
5. The method of claim 4, wherein the fire fighting attachment further comprises a sealing ring made of aluminum alloy, the sealing ring has a groove at one end and a water hose at the other end, and the circular protruding portion of the fire fighting attachment is connected to the groove.
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2022
- 2022-09-26 CN CN202211176213.0A patent/CN115569336A/en active Pending
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| 沙毅 等: "《工程流体力学》", 机械工业出版社, article 郑子军, pages: 101 - 217 * |
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