RU1839094C - Fire nozzle - Google Patents

Description

The invention relates to fire fighting equipment.

A barrel for extinguishing fires with a liquid is known, consisting of a body with a spray nozzle, a handle and a trigger connected to an overlapping device. The overlapping device is connected to the body cavity by a bypass channel, over which a valve with a rod mounted on the trigger is mounted (ed. St. USSR No. 164797, class A 62 C 31/02, 09/23/06).

The disadvantage of this barrel is that when extinguishing, the firefighter must exert more force when pulling the trigger, increasing with increasing pressure in the supply line.

Closest to the technical nature of the invention is the spray gun, consisting of a body, a handle with a lever, a rod with a tip located in the bore of the barrel and connected with the lever, a nozzle and a hydraulic shock absorber (A. Mcheche and Anisov V.N. Water and Foam Supply Equipment for Modern Firefighters (Overview, Series 9, Issue 2, p. 7).

The disadvantages of this barrel include the following.

This barrel during operation cannot provide at different pressures, for example, when extinguishing tasks of the same flow rate on different floors.

When pressing the lever, great physical force must be applied, since it is necessary to overcome the force on the pressure tip of the supplied fluid.

It is not possible to reduce or increase consumption during operation.

It is not possible to adjust the flow depending on the physical strength of the firefighter.

It is impossible to transfer the wisp from the reaction of the jet from the hands to the body of the fireman.

The aim of the invention is to increase safety and reduce physical effort.

This is achieved by the fact that the barrel contains a fluid supply handle, a spring-loaded lever, a housing with a seat located in the channel and provided with a valve stem located in the partition of the housing, which divides the cavity of the latter into the outlet and the blind, has a piston at the end dividing in turn a deaf cavity on

rod and piston, the latter being larger in volume; inside, the rod has a channel, the input of which is located in the inlet cavity, and the rod and piston outputs are equipped with equal doses; the housing is equipped with a butt having a channel, with

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the outside the butt is covered by a spring-loaded sleeve with a stop, and inside the channel there is a rod having a conical section located with a smaller base to the cone and connecting the channel communicated with the piston cavity with the channel communicated with a normally closed lever valve, the outlet of which is connected to the atmosphere .

In FIG. 1, 2 shows a fire barrel in section; in FIG. 3 is a view along arrow A in FIG. 1; in FIG. 4 is a section BB in FIG. 3.

The barrel consists of a housing 1, butt 2 and nozzle 3.

. The housing 1 has a partition 4 dividing the internal cavity into the outlet cavity 5 and the blind 6. A handle 7 is located outside the housing to which a hose 8 for supplying extinguishing fluid is connected. The handle 7 is equipped with a lever 9, sitting on the axis 10 and a spring-loaded spring 11. The lever 9 is equipped with a protrusion 12. The protrusion 12 is in contact with the spring-loaded spring 13 of the valve stem 14 of the valve 15.

In the housing 1, a through hole 16 and a blind hole 17 are made, through the first of which passes, and in the second, the tube 18 is sealed.

Clalan 15 is located in a stepped socket 19, having a saddle 20. Socket 19 is in communication with the hole 17 channel 21.

Inside the housing 1, there is a rod 22, which has a valve 23 in contact with the seat 24 of the nozzle 3, and a piston 25, rigidly mounted on the rod 22. Inside the rod 22, channel 26 is made. The piston 25 cuts off cavity 27 from cavity B. The channel 26 has exit to the cavity by the cavity 27 nozzles 28 and 28 a, equal in cross section. The cavity 6 in volume is not less than the cavity 27.

The butt 2 has a central channel 29 in which the stem 30 is located, having a tapered portion 31, sealed with rings 32 and fixed at the opposite end in a threaded sleeve 33, which in turn is located on the butt 2. The sleeve 33 and the stem 30 have freedom of movement with respect to butt 2 along the axis. An adjusting nut 34 is located on the sleeve 33. A spring 35 is supported on the sleeve 33, the opposite end of which is supported by the butt 2. An abutment 36 is fixed to the end of the sleeve 33.

In butt 2, a channel 37 and a channel 38 are provided, having an exit to the cavity 39. The channels 37 and 38 have an exit to the channel 29, and their exit is located in the region of the conical section 31. The conical section 31 is located on a smaller base to the body

against the outputs of the channels 37 and 38 in the initial position.

The cavity 39 is connected by a tube 18 to the hole 17. The socket 19 is in communication with the atmosphere. The nozzle 3 is provided with a handle 41.

The trunk works as follows.

In the initial position, the lever 9 is released, the spring 13 presses the valve 15 against the seat 20, the spring 35 butt 2 with an emphasis 36 has moved to the right to failure. Valve 23 is closed.

At the beginning of the operation, the extinguishing fluid through the sleeve 8 is fed into the cavity 5 (not shown when opening the supply tap). From the cavity 5, the liquid flows through the channel 26 through the nozzles 28 and 28 a into the cavities 6 and 27. From the cavity 27, the liquid fills the channels 37, 38, tube 18, hole 17 and channel 21. Claen 15 is closed and does not discharge liquid yes- iee.

Since cavity 27 is smaller in volume

juveniles 6, and nozzle 28 a larger in cross section, and filling the cavity 27 with liquid is faster. The fluid in the cavity 27 leads to the piston 25. When filling the cavities 6 and 27, the force on the piston from the side of the cavity 27 is greater due to the difference in area,

After filling the cavities b and 27, the liquid i osto barrel is ready for work,

The firefighter presses the emphasis 36 to the shoulder, I takes the uchka 41 into the left, and the handle 7 into the f equal arm. When you press the lever 9, the valve 5 moves away from the seat 20, and the liquid from the cavity (27 begins to flow out along the path: channel 37, section 31 of the rod 30, channel 38, tube 18, bore 17, channel 21, socket 19, cavity 9 into the cavity 40. The pressure in the cavity 27 is reduced, and the stem 22 begins to move to the right, opening the valve 23. The liquid from the cavity 5 begins to flow to the fire source 4. After the outflow begins, the reaction of the stream occurs, the player’s fireman is perceived. The reaction of the jet causes C km to spring 35, to compress and move the rod 30 to the left. Moving the rod i 30 to the left, respectively, leads to the displacement of section 31. in this case, the last one is set against the transition from the arm 37 to the channel 38 with a large diameter, which decreases and decreases the liquid exit from the cavity 27. The latter leads to the pressure in cavity 27 is increased. Pressure increase (neither in cavity 27 leads to a decrease in the valve cover О 23. The position of section 31 depends on the setting of spring 35, which is adjusted by the firefighter according to his physical forces. If the firefighter is physically weaker, then the spring 35 nut 34 must be loosened, stronger - In addition, the reaction of the jet does not depend on the dosing of the liquid supplied along the sleeve 8.

At high intensity from the jet stem, the reaction of the latter will lead to greater compression of the spring 35 and even more overlapping by the conical section 31 of the cross-section of the transition from channel 37 to channel 38. As a result, the outflow of fluid from the cavity 27 is compared with the inflow through the nozzle 28a, the piston 25 will stop. and there will come a uniform flow of fluid, which the firefighter can physically hold.

If you want to reduce the flow of fluid, you need to barrel for the handle 7 and the handle 41 to press against the shoulder. In this case, the spring 35 will compress more and the rod 30 will move to the left, blocking the cross section of the transition from the channel 37 to the channel 38. The pressure in the cavity 27 will increase and the force on the piston 25 from the side of the latter will increase in comparison with the force from the side of the cavity 6. The piston 25 will move to the left by reducing fluid flow from nozzle 3.

If you want to increase the flow rate of the liquid, you must do the opposite - to move the barrel away from yourself. The spring 35 will loosen, the pressure in the cavity 27 will decrease, and the piston 25 will move to the right, closing the valve 23 more.

In all the described cases of barrel operation, a dynamic equilibrium occurs, providing a uniform flow of fluid, depending only on the reaction force of the jet and spring setting 35 and not depending on the pressure of the supplied fluid.

To close the barrel (stop feeding), release the lever 9. In this case, the outflow of fluid from the cavity 27 is blocked by the valve 15. The pressure in the shaft 27 increases, the piston 25 moves to the left, closing the valve 23.

When the barrel falls out of the hands, the lever 9 is released, and the barrel is operated as described above.

Thus, this barrel allows to reduce the opening force, to adjust the flow rate to the forces of a particular fireman to supply fluid at various pressures supplied by the pump.

(56) Overview Water and foam supply equipment for modern fire engines, 9 series. 2, p. 7, 1984.

Claims (1)

The claims  A fire barrel comprising a body with a seat located in its channel with a valve and a rod and means for supplying liquid, made in the form of a handle with a lever, characterized in that, in order to increase safety and reduce physical effort, the body has a partition that divides the channel housing to the outlet and the muffled cavity, the valve stem is installed in the partition and has at the end opposite the valve a piston dividing the muffled cavity on the rod and rodless, the volume of which is greater than the volume of the rod cavity, the rod has a channel, the input of which communicates with the output cavity, and the rod and rodless outlets are equipped with equal nozzles, the housing is equipped with a butt having a channel, the buttstock being covered with a spring with an emphasis outside, and the stock having a tapered section connecting the channel in communication with the piston cavity with the channel in communication with the normally closed lever valve, which has an outlet to the atmosphere. AA 39 sg pt / & 2 k7Ya Ma r $ 27 7 26 22 // 628- SS. Fi.1 zz for 2 34 behind B G7 p # & 3 G-s f # cpt / &&