RU1809423C - Pressure regulator - Google Patents

Abstract

The invention relates to mechanical engineering. The field of application is automotive, pneumatic brake drives of automobiles. The purpose of the invention, the simplification of the regulator, is achieved by the fact that the diameter of the seat of the atmospheric valve is larger than the diameter of the stem and less than the diameter of the follower piston. 1 silt

Description

The invention relates to the field of mechanical engineering. An advantageous area of its use is pneumatic brake drives of automobiles.

The purpose of the invention is to simplify the design of a pressure regulator.

The goal in the pressure regulator, comprising a housing divided into inlet and outlet pressure cavities communicated between each other by a check valve, a spring-loaded follow-up piston is located in the outlet pressure cavity, controlling by means of a rod movably sealed in the housing by an atmospheric valve connected to rod and located in the inlet pressure cavity, is achieved by the fact that the diameter of the sealing edge of the atmospheric valve is larger than the diameter of the stem at the seal and less than the diameter of the spring loaded next th piston Due to this design, after the atmospheric valve moves away from the seat and the pressure above and below the atmospheric valve is equalized, the follower piston rises further, overcoming the spring force corresponding to the force proportional to the pressure in the outlet cavity and the area of the follower piston

(dc2-du, T2), (1).

where dc is the diameter of the sealing edge of the atmospheric valve;

dun is the diameter of the movable stem seal movably sealed in the housing (see Fig. 1).

Due to this, by selecting the values: dc dun, movably sealed diameter of the Follower piston and spring force of the Follower piston, the outlet pressure is adjustable. the torus will be in the range of 0.65 ... 0.8 MPa, i.e. the atmospheric valve will open at a pressure in the outlet cavity of 0.8 MPa and close at 0.65 MPa, without a cup spring. This simplifies the design of the pressure regulator.

The structural scheme of the controller is shown in the drawing.

ate

with

with

ABOUT

2

u with

The controller includes a housing 1, a check valve 2, a servo piston 3, a stem 4, a baffle 5 in the housing 1, an atmospheric valve 6, an atmospheric valve spring 7, an atmospheric valve seat 8, a spring 9, an inlet pressure chamber 10, an outlet pressure chamber 11 .

The pressure regulator operates as follows.

In the absence of pressure in the cavities 10 and 11, the piston 3, under the influence of the spring 9, presses the valve 6 against the seat 8. In this case, the piston 3 is lowered to the stop in the housing 1. Valve 6, in this position, moves away from the stop in the stem 4, of compression spring 7. The force of the spring 7 is much less than the force of the spring 9. The spring 7 is designed to exclude the possibility of damage to the seal of the atmospheric valve b from the force of the spring 9. The valve 2 is closed by the action of its spring. When compressed air enters the cavity 10, the valve 2 opens and the compressed air from the cavity 10 enters the cavity 11. Under pressure, the piston 3, having overcome the force of the spring 9, starts to rise up. After valve 6 rests against the stop in the stem 4, the valve 6, together with the piston 3, departs from the seat 8 and the air from the cavity 10 begins to escape into the atmosphere. No air will escape from the cavity 11 into the atmosphere through the hole in the seat 8, since as soon as the pressure in the cavity 10 becomes lower than the pressure in the cavity 11, valve 2 will close. As the pressure in the cavity 10 decreases and the pressures equalize above and below the atmospheric valve, the piston 3 together with the valve 6 will additionally rise somewhat, compressing the spring 9. This will happen for the following reason. Before the valve 6 to move away from the seat 8 on the system, the valve 6 - piston 3 down together with the force of the spring 9 acted force

  Pa (dc2-Dc.K2). (2)

where Ra is the pressure in the cavity 10;

dc is the diameter of the saddle;

beige. - diameter of the valve stem 6.

As the pressure in the cavity 10 decreases and the pressures equalize above and below the valve 6, due to an increase in the difference in the forces acting on the system, the valve 6 - the piston 3 up and down (i.e., the force acting down decreases and the force acts

up practically does not change, only slightly increases) the piston 3 together with the valve 6 rises somewhat, compressing the spring 9, even with constant pressure in the cavity 11

After the pressure in the cavity 11 decreases by a certain amount (А Р «0.15 MPa), due to the useful flow rate of compressed air in the actuator, the piston 3 will lower and the valve 6 will be pressed against the seat 8, thus disconnecting the cavity 10с the atmosphere. The maximum pressure at which the valve 6 moves away from the seat 8 is controlled by changing the pre-compression of the spring 9.

After the valve 6 closes, the pressure in the cavity 10 will begin to increase and when it becomes more than the pressure in the cavity 11, the valve 2 will open and the pressure in the cavity 11 will also begin to increase.

The technical effect is to simplify the design of the pressure regulator.

The economic effect of using the proposed technical solution can be achieved by excluding from

design of the disc spring regulator and its adjustment mechanism.

Claims (1)

The claims A pressure regulator comprising a housing divided by a baffle into an outlet pressure cavity in which a spring-loaded follow-up piston is installed, and an inlet pressure cavity in which an atmospheric valve is installed connected through a rod passing through the baffle with a seal and a spring-loaded follow-up piston, the cavities inlet and outlet pressures are connected between through the non-return valve, with the exception of the fact that, in order to simplify the regulator, the diameter of the atmospheric valve seat in it is larger than the diameter of the stem and less than the diameter of the spring-loaded follow-up piston.