RU2819102C1 - Throttling device - Google Patents

Abstract

FIELD: pneumohydraulic automation.

SUBSTANCE: invention relates to pneumatic-hydraulic automation and can be used in automatic control systems for controlling flow rates of liquid flows. Throttle device comprises a body with a branch pipe, a seat, a disk gate with a rod rotating in the guide hole of the housing from the drive. To ensure smooth change of flow section, a throttle hole is made on the disk spring-loaded to the seat in the form of a non-overlapping round hole with a radial slot from the axis to the periphery, and the axis of rotation of the disk with the rod is parallel to the axis of the seat. Distance between the axes is equal to half the length of the radial slot on the disc, which allows smoothly covering the slot with the edge of the seat wall from the minimum to maximum flow sections of the throttle when the disc is rotated through 180 degrees. On the cylindrical surface of the housing, which covers the output rod, there is a scale for determining the angle of rotation of the rod and accuracy by vernier installed on the end of the rod.

EFFECT: invention makes it possible to smoothly adjust the flow passage of the throttle with possibly identical angular turns of the damper, as well as determine the flow area of the throttle washer for installation in a specific product using a throttle.

1 cl, 3 dwg

Description

Known throttle A.S. SU 431361 A1, which refers to devices for hydraulic systems, for example, the engineering industry in the form of a package of three disks adjacent to each other with ground-in flat surfaces and fixed in a certain position, on the middle of which throttle channels are made, located around the circumference in the middle disk and interconnected by cylindrical cavities made in the outer disks. The throttle channel is formed by through holes in the middle disk, which are connected in series by cylindrical cavities, the centers of which are located between these holes, and the cavities of one outer disk are offset relative to the cavities of the other. One of the outer disks is equipped with several outlet holes, which makes it possible to increase the degree of throttling. The discs are compressed together with a bolt and a nut. A plug is installed in the outlet hole, which can be moved to other holes to change the throttle resistance. The working fluid enters the internal cavity through the hole and is throttled through the holes and cylindrical cavities, and exits at a given flow rate through one open outlet hole.

The disadvantages of the throttle are:

- discrete adjustment to the required throttle resistance;

- complexity of the design;

- instability of characteristics due to the presence of leaks between the throttle discs.

A shut-off and control valve is known, patent RU 113805 U1, containing a sealed housing with pipes, a fixed seat installed in the housing and a movable damper with windows made in them, and a movable damper driver with a lever installed at its outer end, and the lever is connected to the driver by means of an elastic clamp

A multi-way valve is known according to utility model patent No. 26333. The crane is simple in design and reliable in operation. The valve contains a housing with inlet and outlet pipes. In the cavity of the hollow cylindrical body, between the openings of the pipes, there are plates, a fixed seat and a movable damper with windows made in them, interacting with each other at their ends. One plate is fixed in the housing cavity, and the other damper is connected by a driver to the mechanism for its rotation, mounted on its outer end by a lever, which is connected to the driver by means of an elastic clamp. The clamp is made in the form of a collet with petals located on a leash. A washer made of anti-friction material is installed between the movable damper driver and the housing cover, ensuring smooth operation of the valve.

The disadvantages of the throttle are:

- uneven regulation of valve resistance at equal angular rotations of the damper;

- rough adjustment to the required flow rate due to unstable leaks between the installed plates interacting with each other at their ends;

- impossibility of application at high pressures of the working fluid and high-precision hydraulic requirements for adjusting the flow rate of the working fluid with small flow sections.

The purpose of the invention is to smoothly regulate the flow area of the throttle with possibly identical angular rotations of the damper in a wide range of pressures of the working fluid, as well as to determine the flow area and manufacture a throttle washer of the required flow area for installation in a specific product based on the results of its determination using a throttle.

In the body of the proposed design of the throttle device there are two cavities separated by a wall with a hole and a shoulder in the form of a saddle. One high-pressure cavity - the inlet cavity is closed with a lid with an inlet pipe. The other low pressure cavity is the outlet cavity with a side outlet and an axial guide hole for the rod that rotates the valve and exits the body to connect to the actuator. The axis of the rod is parallel to the axis of the seat and located at a certain distance. The butterfly valve is rigidly connected to the rod (made in one piece). A spring is installed in the inlet cavity, which presses the damper disk against the seat, and the rod passes through the seat and through the guide hole of the body and exits the body to connect to the actuator.

The damper disk has a non-closable calibrated round through hole and a radial narrow slot from it towards the periphery of the rod. The length of the slot is twice the distance between the axes, and the slot smoothly overlaps when rotated 180 degrees by the edge of the housing seat wall, reducing the flow area. The non-closable hole in the minimum flow area of the throttle is formed by the circular edge and the wall of the seat; the slot is completely blocked. To ensure tightness along the seat, the butterfly valve is pressed by a spring, and the rod extending from the body is sealed in the body with a gland seal, which is pressed by a spring installed above the rod. On the outer surface of the body at the exit of the rod from the body there is a circular division scale to determine the rotation of the damper rod, and a vernier is attached to the end of the rod. The width of the slot can be used to achieve a smooth and uniform change in the area of the flow section depending on the angle of rotation of the valve on the seat and its conversion to the equivalent circular cross-section of the washer being manufactured.

The essence of the invention is illustrated by the drawing FIG. 1. In Fig. Figure 1 shows a general view of the proposed design of the throttle device.

The throttle consists of a body 1 with a pipe 2 and a seat 3 connecting the high-pressure cavity with the low-pressure cavity, a butterfly valve 4 with a rod 5, which passes through the seat into the low-pressure cavity and exits the housing 1 through a guide hole, in which it is sealed with seal 6. The axis of the seat does not coincide with the axis of the rod by the amount of A cm, and is made with an offset towards the outlet pipe 2. A cover with an inlet pipe 7 is installed at the inlet of the housing.

On the damper disk 4 (see Fig. 1, Fig. 2 and Fig. 3 and callouts B and C) there is a non-overlapping round throttle hole 8 from which, to the side of the axis from the non-overlapping hole, a narrow slot 9 is made with a length equal to twice the size - distance from the axis of the hole of the seat 3 to the axis of the rod 5. A spring 10 is installed between the inlet cover 7 and the damper disc 4, which presses the damper to the seat 3 through the hinge support 11. The disc damper rotates when the rod coming out of the body rotates, while the slot 9 rotation of the rod 5 is gradually completely blocked by the wall 13 of the housing, separating the high-pressure cavity with spring 10 from the low-pressure cavity with exit to pipe 2. On the cylindrical surface of the housing, which covers the rod, sealed with an oil seal 6 and spring 12, coming out of the housing, there is a scale 14, and a vernier 15 is attached to the end of the rod to accurately determine the flow area of the throttle hole.

On the disk (see Fig. 2) the throttle passage is completely open.

On the disk (see Fig. 3) the throttle passage hole is minimal and is determined only by hole 8, slot 9 is blocked by wall 13.

Claims (1)

A throttle device comprising a housing with pipes, a seat, a valve with a hole in the disk and an adjacent rod extending from the housing for connection to the drive, and characterized in that the axis of the valve disk, rigidly connected to the rod rotating the disk, and the axis of the seat are parallel and the rod passes through the seat and through the guide hole with a seal from the body to the drive, and the disk is pressed against the seat by a spring and there is an unobstructed round hole on it with a radial slot from the axis to the periphery, the length of which is equal to twice the distance between the axis of the seat and the axis of the rod , and the slot smoothly overlaps with the edge of the seat wall, when the disk slides along the seat when the rod rotates 180 degrees from the minimum to maximum flow sections, and on the cylindrical surface of the body covering the exiting rod, a scale is applied that determines the angle of rotation of the rod and the accuracy of the vernier mounted on end of the rod.

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