RU68326U1 - AEROSOL SPRAY GUN - Google Patents

Abstract

A barrel is proposed for receiving water jets of aerosol spray containing a housing 1 with a channel. The channel of the housing 1 is made in the form of a consecutively located portion of the confuser 2 with an inlet d ₁ , an angle of the confuser α ₁ and a length of the section ℓ ₁ , a cylindrical section 3 of a critical section with a diameter of d ₂ and a length of the section ℓ ₂ , the first diffuser 4 with the inlet d ₂ the diffuser angle α ₂ and the section length ℓ ₃ , the second diffuser 5 with the inlet d ₃ , the diffuser angle α ₃ and the section length ℓ ₄ , and the second cylindrical section 6 with the diameter d ₄ and the section length ℓ ₅ . The angle of the confuser 2 α ₁ is an angle from 45 ° to 90 °. The angle of the first diffuser 4 α ₂ is an angle from 14 ° to 90 °. The angle of the second diffuser 5 α ₃ should be no more than 14 °. The length of the cylindrical section 3 of the critical section ℓ ₂ is not more than two of its diameters d ₂ . The length of the first diffuser 4 ℓ ₃ is not more than ten diameters of its inlet d ₂ . The length of the second diffuser ℓ ₄ is not more than ten diameters of its inlet d ₃ . Moreover, the diameter of the second cylindrical section d _{4 is} less than the input diameter of the confuser d ₁ , and the length of the second cylindrical section ℓ ₅ is not more than ten of its diameters d ₄ . 1 ill.

Description

The invention relates to the field of fire fighting equipment, and more particularly to barrels for receiving aerosol spray jets.

A well-known barrel for supplying extinguishing agents contains a longitudinal body with a channel for extinguishing agent, a nozzle for forming a jet of extinguishing agent emanating from the body and a tube for regulating the size of the outgoing jet, installed with the possibility of longitudinal movement along the body and nozzle and covering the latter. The nozzle is made in the form of a nozzle with a confuser rigidly connected to the housing, on the surface of the tube for regulating the size of the outgoing jet, bushings of material with low thermal conductivity are rigidly mounted, and a perforated tube is formed on the sleeves, forming a handle for moving the tube and adjusting the size of the outgoing jet (patent No. 48795 dated June 17, 2005, А62С 31/03).

However, when using such a device to adjust the size of the outgoing jet of extinguishing agents, it will have a large expansion angle, and therefore a small range. This is due to the fact that under supercritical regimes of the outflow of two-phase media, gas - superheated water has a pressure that leads to additional expansion of the jet.

For effective fire fighting, it is necessary that the fire extinguishing agent jets created by the barrels in some cases have the maximum possible range, in other cases they should have a large spray angle with a small range to increase the efficiency of the jet.

This technical result of the utility model is achieved due to the fact that the barrel for receiving water jets of aerosol spray contains a body with a channel made in the form of consecutive sections of the confuser, a cylindrical section of a critical section, a first diffuser, a second diffuser, and a second cylindrical section. The confuser angle is between 45 ° and 90 °. The angle of the first diffuser is from 14 ° to 90 °. The angle of the second diffuser should be no more than 14 °. The length of the cylindrical section of the critical section is not more than two diameters. The length of the first diffuser is not more than ten diameters of its inlet. The length of the second diffuser is not more than ten diameters of its inlet. Moreover, the diameter of the second cylindrical section is less than the input diameter of the confuser, and the length of the second cylindrical section is not more than ten of its diameters. This ratio of the parameters of the housing with the channel allows you to get a steady stream of water aerosol spray of high dispersion, and therefore with high fire extinguishing properties.

The utility model is illustrated in more detail by the drawing, which shows the proposed barrel for receiving water jets of aerosol spray, a general view.

The barrel for receiving water jets of aerosol spray housing 1 with a channel (means of connection with the sleeve of a fire installation in the drawing is not shown). The channel of the housing 1 is made in the form of a consecutively located portion of the confuser 2 with an inlet d ₁ , an angle of the confuser α ₁ and a length of the section ℓ ₁ , a cylindrical section 3 of a critical section with a diameter of d ₂ and a length of the section ℓ ₂ , the first diffuser 4 with the inlet d ₂ the angle of the diffuser α ₂ and the length of the section ℓ ₃ , the second diffuser 5 with the input

the hole d ₃ , the diffuser angle α ₃ and the length of the section ℓ ₄ , and the second cylindrical section 6 with a diameter of d ₄ and the length of the section ℓ ₅ . The angle of the confuser 2 α ₁ is an angle from 45 ° to 90 °. The angle of the first diffuser 4 α ₂ is an angle from 14 ° to 90 °. The angle of the second diffuser 5 α ₃ should be no more than 14 °. The length of the cylindrical section 3 of the critical section ℓ ₂ is not more than two of its diameters d ₂ . The length of the first diffuser 4 ℓ ₃ is not more than ten diameters of its inlet d ₂ . The length of the second diffuser 5 ℓ ₄ is not more than ten diameters of its inlet d ₃ . Moreover, the diameter of the second cylindrical section 6 d _{4 is} less than the input diameter of the confuser d ₁ , and the length of the second cylindrical section 6 ℓ ₅ is not more than ten of its diameters d ₄ .

To obtain the maximum range of the aerosol spray jet from 8 to 10 m at a feed rate of 1.0 l / s superheated water with a temperature of 165 ° C to 170 ° C and at a pressure in front of the confuser of 1.0 MPa (10 atm.), The following are optimal barrel bore dimensions: d ₃ α ₃ ℓ ₅

The input diameter d _{1 of the} confuser 2-20 mm;

Angle α _{1 of the} confuser 2-60 °;

The diameter d _{2 of the} cylindrical section 3-4.8 mm;

The angle α _{2 of the} first diffuser 4-19 °;

Length ℓ _{3 of the} first diffuser 4-15 mm;

The angle α _{3 of the} second diffuser 5-4 °;

Diameter d _{4 of the} second cylindrical section 6-18 mm;

The length ℓ _{5 of the} second cylindrical section is 6-120 mm.

The device operates as follows.

Superheated water enters the channel of the barrel body 1 to receive water jets of aerosol spray and, passing through the confuser 2, increases its speed to a maximum speed, but not more than the speed of sound in a cylindrical section 3 of a critical section. However, due to a pressure greater than the pressure of saturated water vapor, the water does not boil

(evaporates) neither in the confuser 2, nor in the cylindrical section 3 of the critical section.

Passing through the first diffuser 4, the stream of superheated water breaks off from the channel walls, part of the superheated water boils and forms a steam-water mixture, which is located between the stream of non-evaporated (boiled) water and the channel walls (inner surface of the barrel). The temperature of superheated water due to the evaporation of water decreases with increasing distance to the critical section. The amount of evaporated superheated water depends on the angle α ₂ and length ℓ _{3 of the} first diffuser 4: with increasing angle α ₂ and length ℓ _{3, the} amount of evaporated superheated water increases, and the temperature decreases. Therefore, in each cross section of the channel of the barrel body 1, the steam-water mixture creates a pressure between the channel walls and the jet surface greater than or equal to the saturated vapor pressure of superheated water. The angle α ₂ and the length ℓ _{3 of the} first diffuser 3 are selected so that the jet of superheated water either completely evaporates when passing through the first diffuser 4 or only partially evaporates.

If, when passing through the first diffuser 4, the stream of superheated water completely disintegrated (lost its integrity) and turned into a steam-water mixture, then, when passing through the second diffuser 5, the speed of the steam-water mixture expands and accelerates. The angle α ₃ and the length ℓ _{4 of the} second diffuser 5 are selected so that the steam-water mixture does not detach from the channel walls. When passing the steam-water mixture through the second cylindrical section 6, there is a further increase in its speed of movement, as well as a decrease in temperature and pressure of the steam-water mixture. The length ℓ ₅ and the diameter d _{4 of the} second cylindrical section 6 are selected so that the pressure of the steam-water mixture at the outlet of the barrel is equal to the atmospheric pressure outside the barrel.

If, when passing through the first diffuser 4, the stream of superheated water did not completely decompose (lost integrity) and not all of the superheated water turned into a steam-water mixture, then when passing through the second

diffuser 5 is the further evaporation of superheated water, as well as the expansion and increase in the speed of movement of the steam-water mixture. The angle α ₃ and the length ℓ _{4 of the} second diffuser 5 are selected so that the steam-water mixture does not detach from the walls of the channel of the housing 1, and so that the remaining integral jet of superheated water either completely evaporates when passing through the second diffuser 5 or only partially evaporates . When passing through the second cylindrical section 6, there is a further increase in the speed of movement of the steam-water mixture, as well as a decrease in temperature and pressure of the steam-water mixture.

If, when passing through the second diffuser 5, the superheated water completely transferred to the steam-water mixture, then the length ℓ ₅ and the diameter d _{4 of the} second cylindrical section 6 are selected so that the pressure of the steam-water mixture at the outlet of the barrel is equal to the atmospheric pressure outside the barrel.

If, when passing through the second diffuser 5, the stream of superheated water did not completely decompose (lost integrity) and not all superheated water turned into a steam-water mixture, then when passing through the second cylindrical section 6, further evaporation of superheated water occurs, as well as expansion and increase of the speed of movement steam-water mixture. The length ℓ _{5 of the} second cylindrical section 6 is selected so that the remaining integral stream of superheated water either completely evaporates when passing through this section or only partially evaporates.

If, during the passage of the second cylindrical section 6, the remaining part of the jet of superheated water completely transfers to the water-vapor mixture, then the length ℓ ₅ and diameter d _{4 of the} second cylinder section 6 are selected so that the pressure of the water-vapor mixture at the outlet of the barrel is equal to atmospheric pressure outside the trunk.

If, when passing through the second cylindrical section 6, the jet of superheated water did not completely dissolve (lost integrity) and not all the superheated water turned into a steam-water mixture, then when a jet exits the barrel, the jet of superheated water completely passes into the steam-water mixture

(stream). At the exit of the barrel, the jet expands.

The stated correlation of the geometry parameters of the channel of the barrel housing 1 were established experimentally, and allow to obtain the optimal parameters of water jets of aerosol spray with high fire extinguishing properties.

With the input diameter of the confuser 2 d ₁ less than the diameter of the second cylindrical section 6 d ₄ , it is impossible to implement all of the above modes of operation of the barrel.

If the angle α _{1 of the} confuser 2 is less than 45 °, the barrel length is unreasonably increased.

If the length of the cylindrical section 3 of the critical section exceeds two diameters d ₂ , then the hydraulic resistance of the barrel increases significantly and the range of the water jet of aerosol spray decreases. It is necessary to strive for a minimum length ℓ _{2 of the} cylindrical section 3.

If the angle α _{2 of the} first diffuser 4 is less than 14 °, then during operation of the device there is no separation of the jet of superheated water from the channel walls. If the length ℓ _{3 of the} first diffuser 4 is more than 10 d ₂ , then only the first mode of operation of the barrel can be realized in the barrel — complete evaporation of the jet in the first diffuser 4.

If the angle α _{3 of the} second diffuser 5 is greater than 14 °, then the second diffuser 5 detaches the jet of steam-water mixture from the channel walls, which increases the turbulence of the jet and reduces its range. If the length ℓ _{4 of the} second diffuser 5 is more than 10 d ₃ , then the first and second modes of operation of the barrel can be realized in the barrel, that is, the complete evaporation of the jet in the first and second diffuser.

If the length ℓ _{5 of the} second cylindrical section 6 is greater than 10 d ₄ , then the first, second and third modes of operation of the barrel can be realized in the barrel — complete evaporation of the jet in the first, second diffuser and second

a cylindrical section, while significantly increasing the hydraulic resistance of the barrel and decreases the range of the water jet of aerosol spray.

Claims (1)

A barrel for receiving water jets of aerosol spray containing a body with a channel made in the form of consecutive sections of a confuser, a cylindrical section of a critical section, a first diffuser and a second diffuser, and a second cylindrical section, with the angle of the confuser from 45 to 90 °, the angle of the first diffuser from 14 to 90 °, the angle of the second diffuser is not more than 14 °, while the length of the cylindrical section of the critical section is not more than two diameters, the length of the first diffuser is not more than ten diameters of its inlet, and the length of the second diffuser is not more than ten diameters of its inlet, and the diameter of the second cylindrical section is less than the input diameter of the confuser, and the length of the second cylindrical section is not more than ten diameters.