RU2694714C1 - Straight-flow valve, three-position with cam drive - Google Patents

Abstract

FIELD: pipeline systems.

SUBSTANCE: invention relates to pipeline valves and is intended for control of fluid medium flow in pipelines and quick disconnect connections of pipes. Valve comprises tubular housing 1 with seat 2 and gate 3 with spring 4 and slide 5, arranged in chamber 6 with cover 7 inside gate 3. External surface of gate 3 is formed by longitudinal ribs 8, between which there are channels 9 for passage of liquid. Mechanical gate drive comprises cam shaft 10 with cams 11 fixed on shaft sleeve 12 fixed thereon by means of pin 13 and control handle 14 fixed in radial hole 15 of cam shaft 10 at its end extending outward from housing 1. Chamber 6 in the bolt can be provided with support 16 for slide 5. Cams 11 can have flat tops 17. Slider 5 can be made with rod 18 extending to end face of gate 3 through hole with ring seal 19 pressed to gate 3 by spring 4. Same ring seals 19 with springs 20 resting on bushing 12 can be installed on cones of cam shaft 10 for sealing of its joint with housing 1.

EFFECT: valve design is characterized by reduced weight and dimensional parameters, high reliability and heat resistance, as well as additional functions.

8 cl, 8 dwg

Description

The invention relates to pipeline equipment and is designed to control the flow of fluid in pipelines and quick-disconnect pipe connections (BRS).

Known direct-flow valves containing a tubular body with a saddle and bolt with a mechanical drive control valve from entering the shaft housing through a gear (see. RU 2234018 and RU 2455543).

The disadvantages of these valves are large weight and dimensions and production costs associated with the complex design of the housing and additional parts, centering the valve in the housing, as well as the lack of fixation of the valve in the closed and open positions. In addition, they cannot perform the additional function of a check valve, which requires springs on the valves.

Known direct-flow valves containing a body with a saddle and a spring-loaded gate, widely used in the BRS (see EN 2170873 and in the book of OF.F. Nikitin, KM Kholin "Volumetric hydraulic and pneumatic actuators" Fig. 6.25 p. 164. - M .: Mashinostroenie, 1981)

The disadvantage of such valves are significant weight and dimensions due to the presence of the supporting elements of the valves and springs and the ability to drive the valve only from the outlet of the housing, which does not allow the valves to be controlled after docking the BRS to shut off the fluid flow through the pipeline and makes it difficult .

The closest to the claimed invention in technical essence is a straight-flow valve with two seats and spring-loaded valves with a mechanical control drive using a camshaft extending out of the housing (see RU 2184295 and in the book by GA Nikitin, AA Komarov ” Distributing and regulating devices of hydraulic systems "Fig. 55 p. 106. - M .: Mashinostroenie, 1965).

A feature of this valve is the ability to control two shutters from one camshaft, which expands its functionality.

The disadvantages of the prototype:

1. High weight and size parameters caused by the complex configuration of the body and the presence of its covers to hold and control the valves, springs and camshaft supports.

2. Insufficient reliability due to the lack of fixation of the valves in the open position under conditions of vibration of the housing, since Only the friction force on the cam prevents the cam shaft from turning from open to closed.

3. The inability to improve the reliability and heat resistance of the valve without increasing the size of the use of seals with spring-loaded pressure.

4. The inadmissibility of the application in the BRS due to the increase in the volume of fluid flowing when disconnecting the BRS.

The technical problem posed in the present invention is to preserve the advantages of the prototype while eliminating the indicated disadvantages by using its finned surface with channels between the ribs for fluid flow, supporting the spring to the camshaft via a slide controlling the position of one or two valves , and the use of removable cams on the cam shaft, as well as the use of spring-loaded seals.

The technical result consists in reducing the weight and size indicators and production costs, improving reliability and heat resistance, as well as expanding the functionality of the number of working positions and application in the BRS.

The essence of the invention is that the three-position straight-flow valve with a cam drive includes a tubular body with a seat and a spring-loaded mechanically actuated valve using a camshaft extending out of the body to the control handle through annular seals perpendicular to the axis of the body. According to the invention, the outer surface of the shutter is formed by longitudinal ribs, and inside the shutter there is a chamber equipped with a lid, in which the cam shaft and the bolt spring supported through the slider are located on the cam of this shaft.

In particular cases of implementation:

- the slider is placed in the chamber of the shutter with the possibility of emphasis in its end in the closed position of the valve;

- the cam of the camshaft is made removable with the possibility of fixed fixation on the shaft through the sleeve surrounding the shaft, for example with a pin;

- the camshaft is made with two opposedly spaced cams, and the slider is provided with a rod that faces the end of the valve through an opening with an annular seal;

- the annular seals of the camshaft and the slider stem are equipped with axial pressure springs;

- the valve bolt spring is supported on the slide of the slider rod;

- the top of the cam is made flat;

- the control knob of the camshaft is fixed in a radial hole at its end with the possibility of rotation around the axis of this hole and made of spring wire.

FIG. Figure 1 shows the valve design in the first position of the camshaft with a check valve function.

FIG. 2 is a section along A-A in FIG. one.

FIG. 3 is a section along BB in FIG. one.

FIG. 4 - condition of parts in the process of assembling the valve.

FIG. 5 - valve in the second position of the camshaft with the function of the open state.

FIG. 6 - valve in the third position of the camshaft with the function of the closed state.

FIG. 7 - valve design for the BRS in the closed position.

FIG. 8 - valve in FIG. 7 in the open position.

The valve includes a tubular body 1 with a saddle 2 and a bolt 3 with a spring 4 and a slider 5 placed in a chamber 6 with a lid 7 inside the bolt 3. The outer surface of the bolt 3 is formed by longitudinal ribs 8, between which there are channels 9 for fluid flow. The mechanical shutter drive includes a cam shaft 10 with cams 11 mounted on a sleeve 12 which surrounds the shaft and fixed to it by means of a pin 13, and a control knob 14 fixed in a radial hole 15 of the cam shaft 10 at its end, which extends outside of the housing 1. Camera 6 in the gate 3 can be provided with an abutment 16 for the slide 5. The cams 11 can have flat peaks 17 (FIG. 3). The slider 5 can be performed with the rod 18 (Fig. 7) facing the end of the shutter 3 through the holes with an annular seal 19, pressed against the shutter 3 by a spring 4. The same annular seals 19 with springs 20 supported on the sleeve 12 can be mounted on the ends a cam shaft 10 for sealing its joint with the housing 1 (FIG. 2).

In the case of using the valve in the coupling (Fig. 7, 8), the rod 18 may abut against the bolt 21, docked to the body 1 of the valve 22.

The assembly of the valve parts in the housing 1 (FIG. 4) is performed using a mandrel 23, replacing the cam shaft 10 until the valve 3 is installed in the housing 1 until it stops in the seat so that the mandrel 23 is opposed to the O-rings 19.

After that, the mandrel 23 is squeezed out of the sleeve 12 by the cam shaft 10, and the sleeve 12 is fixed on the shaft 10 with a pin 13. Then the cover 7 is mounted on the shutter 3.

The removability of the cam 11 together with the bushing 12 from the cam shaft 10 ensures its installation into the housing 1 through minimal openings with o-rings 19 without commonly used caps with additional seals, which significantly reduces the dimensions of the housing 1. Uses the o-rings in the joints of the cam shaft 10 19 with springs 20 axial clamping provides the valve with increased reliability and heat resistance, since The elastic properties of such springs depend little on the storage time and temperature. The implementation of the support of the spring 4 on the ring seal 19 on the rod 18 allows it to be used simultaneously for pressing this ring and the gate 3, which reduces the number of valve parts and the cost of its production. The implementation of the control knob 14 of spring wire passing through the radial hole 15 at the end of the camshaft 10, allows it to rotate around the axis of this hole 90 ° or 180 ° from the vertical position, which reduces the radial envelope of the valve. Fixing the handle 14 in the hole 15 of the camshaft 10 is due to the fact that the handle 14 of the spring wire before installation in a cylindrical hole has an initial bend, which straightens after installation and creates a clamping force in the contact zone, fixing the position of the handle. When turning the control knob 14 to 180 °, it additionally fixes the position of the “closed” position of the camshaft 10 by touching the ends of the housing 1 with its ends.

The valve operates as follows. In the first position (Fig. 1, 3) of the cam shaft 10, its cam 11 and the control knob 14 are oriented transversely to the axis of the housing 1. In this case, the spring 4 tightly presses the shutter 3 to its saddle 2, and the slider 5 to the sleeve 12. In case of exceeding fluid pressure from the seat 2 over the pressure from the cam shaft 10, the shutter 3 is pressed from the saddle 2 and moves to the cam 11 until it stops 16 in the slider 5, allowing the fluid to pass around the shutter 3. In the case of a reverse pressure drop, the valve is tight, t .to. the shutter is additionally pressed against the saddle, i.e. works in check valve mode.

In the second position of the cam shaft 10 (FIG. 5), which it takes after turning the control knob 14 by 90 ° so that the cam 11 faces the lid 7, the valve is constantly open, since the shutter 3 is held by the cam at the maximum distance from the saddle 2. In this case, the flat top 17 of the cam 11 reliably fixes the cam shaft 10, since the rotation of this shaft at the beginning of its stroke is accompanied by an additional pressing of the spring 4.

In the third position of the cam shaft 10 (FIG. 6), which it takes after turning the control knob 14 from position two 180 °, the cam 11 through the slider 5, which rests against the stop 16, presses the shutter 3 to the saddle 2, preventing it from being spun even the differential pressure on the gate 3 from the side of the seat 2. In the case of a valve assembly with a second, opposedly mounted cam and stem 18 for using the valve in the RLL (Fig. 7) when the control knob 14 and the cams 11 are oriented across the axis of the housing 1, the valve is closed by pressing 3 to the saddle 2 spring 4, and its rod 18 is not you blunt over the end of the shutter 3 and does not open the shutter 21 of the docked valve 22. When turning the control knob 14 by 90 ° (Fig. 8), one of the cams 11, resting on the cover 7, retracts the shutter 3 from the saddle 2, overcoming the force of the spring 4. When This second cam 11 moves the slider 5 with the rod 18 beyond the end of the body 1 and, resting against the bolt 21 of the docked valve 22, opens this valve as well. When the control knob is rotated through 90 °, the spring 4 restores the initial position of the shutter 3 and the stem 18. Using the valve in the coupling unit ensures that the minimum amount of fluid loss during disconnection and the ability to shut off the flow of the fluid in the coupled valve position, i.e. perform an additional function. From the foregoing it follows that the proposed valve design differs from the prototype by significantly reduced mass-dimensional indicators and production costs, increased reliability and heat resistance, as well as additional functions.

Claims (8)

1. The valve is direct-flow, three-position with a cam drive, containing a tubular body with a seat and a spring-loaded mechanically-driven gate using a cam shaft, extending outside the body to the control handle through an annular seal perpendicular to the axis of the body, characterized in that the outer surface of the gate is formed by longitudinal ribs , and inside the shutter there is a chamber equipped with a lid in which the cam shaft and the bolt spring supported through the slider on the cam of this shaft are located. 2. Valve under item 1, characterized in that the slider is placed in the chamber of the shutter with the possibility of focusing on its end in the closed position of the valve. 3. Valve under item 1, characterized in that the cam of the cam shaft is made removable with the possibility of fixed fixation on the shaft through the sleeve surrounding the shaft, for example, using a pin. 4. Valve according to claim 1, characterized in that the cam shaft is made with two opposedly spaced cams, and the slide is provided with a rod extending to the end of the valve through an opening with an o-ring seal. 5. Valve according to Claim. 1, characterized in that the annular seals of the camshaft and the slide shaft are provided with axial bias springs. 6. Valve under item 4, characterized in that the valve bolt spring is supported on the O-ring seal of the slide. 7. Valve under item 1, characterized in that the top of the cam is made by a strip. 8. Valve under item 1, characterized in that the cam shaft control knob is fixed in a radial hole at its end with the possibility of rotation around the axis of this hole and made of spring wire.

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