SU1273124A1 - Vacuum system for fire engine - Google Patents

Abstract

The invention allows to improve the reliability of the vacuum shutter used in the vacuum system of a fire engine. For this, mushroom-shaped valves are used in the vacuum seal (VZ) 7. The valve, which is integral with the rod, closes the VZ 7 bypass hole below. Thus, when the vacuum jet pump (VSN) 2 is turned on in the vacuum line of the vehicle’s vacuum system between the vacuum chamber 15 and the cavity of the fire pump 17, connected through the lower part of the VZ 7 and connected by pipeline 8, a vacuum is created. As a result, water enters the cavity of the fire pump 17 from the expansion chamber 15 and, at a certain pressure in the vacuum system vacuum line, lifts one valve, which acts on the other valve by moving it upwards, connecting the VZ 7 chamber to the atmosphere. As a result, the water rushes through the chamber along S (L in two directions: through the holes in the bridge into the chamber and is drunk from the OT 7 in the other direction, through the fitting 9, pipe 9 into the cavity of the hydraulic actuator 4, and acts on the membrane

Description

wound 5. The membrane presses on the pusher 6, which turns the valve 3 and turns off the VSN-2. Due to the disruption of the jet, the pressure in the cavity of the fire pump 7 and, consequently, in the chambers drops, as a result of which the valves return to their original position. In connection with this

the spring located in the hydraulic actuator 4 moves with the membrane 5 and returns the plunger 6 to the initial position. The BCH 2 is turned on, the flap 3 is raised, and the process of filling the fire pump 17 with water is repeated. 2 Il.

The purpose of the invention is to simplify the manufacture and ensure the reliability of the vacuum system of a fire engine.

This goal is achieved by the fact that the vacuum gate valves are mushroom-shaped, and the valve located in the air chamber is spring-loaded.

FIG. shows a diagram of the vacuum system of a fire engine; figure 2 - vacuum shutter section.

The vacuum system contains a vacuum jet nozzle 2 installed in the line of the exhaust line 1 of a fire engine vehicle, in the case of which a spring-loaded butterfly valve 3 is located; the hydraulic actuator 4, in the case of which is located a working body, made in the form of a membrane 5, capable of acting on a pusher 6 having the shape of a lever; a vacuum shutter 7 connected via pipelines 8 and 9 to the pump 2 and hydraulic actuator 4 and consisting of a housing 10, inside of which there are freely installed valves P and 12, which are made mushroom-shaped, and valve 12 is integral with the rod

13, which ensures the alignment of the valve 12. In the case of the vacuum shutter 7 there are also an air chamber.

14, which is connected to the atmosphere and through valve P to the vacuum chamber 15 of the vacuum pump, and the discharge chamber 16 in communication with the vacuum chamber of the vacuum pump,

and through valve 12 - with the cavity of the water pump 17. In the air chamber of the vacuum seal between the valve II and the cap 18 there is a spring 19. The system works as follows.

To fill the pump 17 with water, it is necessary to turn on the vacuum jet pump 2 and increase the frequency of rotation of the engine shaft. In this case, a vacuum is created in the chamber 15, and consequently, in the pipeline 8 and in the discharge chamber 16, under the action of which the valve 12 moves away from the saddle and informs the cavity of the pump casing 17

with a dilution chamber 15.

A vacuum is also created in the cavity of the fire pump 17, as a result of which the latter is filled with water. As the pump impeller rotates, the pressurized water enters the pressure manifold and then under the valve 12, which rises and presses against the upper seat of the discharge chamber 16, while the valve 1 raises through the rod 13, and the valve 12 divides the chamber of the vacuum jet pump 2 the cavity of the water pump 17 and through the chamber 14 communicates it with the atmosphere,

1 thus ensuring the possibility of draining the water from the pipeline 8. At the same time, the pressurized fluid through the chamber 16 and the pipeline 9 enters the hydraulic drive.

4 and, acting on the membrane 5 associated with the pusher, turns the valve 3 and turns off the vacuum pump.

When a jet breaks off, the pressure in the cavity of the fire pump 17, and consequently, in the chambers 16 and 14 connected by pipeline 9, drops. The valve 12 under the action of the force of weight, and the valve 11 under the action of the force of weight and

the springs 19 move to their original position.

Claims (1)

The hydraulic actuator spring through the membrane 5 and the turbine 6 connected to it turns the valve 3, turns on the vacuum pump. Further, the process of filling the fire pump with water is repeated. The valves in the vacuum valve are mushroom-shaped, the valve in the air chamber is spring-loaded, and the valve in the pressure chamber along with the rod simplifies the manufacture of the vacuum valve and ensures the reliability of the vacuum system. Invention formula Vacuum fire engine system containing a vacuum jet pump installed in its exhaust duct line with a spring-loaded rotary valve 244, hydraulic actuator with a working body, a vacuum shutter having a housing inside which are located valves and a rod, an air chamber connected to the atmosphere and through valve — with a vacuum pump vacuum chamber; a discharge chamber in communication with the vacuum pump vacuum chamber and through a valve with a water pump cavity, characterized in that oshchenilas manufacture and provide reliable operation of the system, the vacuum gate valves are made mushroom-shaped valve positioned in the air chamber, podupruzhinen, a valve disposed in the pressure chamber, is formed integrally with the rod.