Regulating valve

FIELD: manufacture of fittings and adjusting units for piping systems.

SUBSTANCE: proposed valve has body with inlet, outlet and main holes; body is provided with adjusting member made in form of piston moving coaxially in main hole of body. Outer surface of piston and inner surface of main hole are embossed in form of radial circular fins or honeycombs.

EFFECT: reduction of erosion wear; improved service characteristics in contaminated media containing solid particles.

5 cl, 10 dwg

 

The invention relates to the field of valve industry, in particular to regulating devices pipelines for steam, water, other gases and liquids.

Known control valve, comprising a housing with an inlet, an outlet and a seat connected with the rod shut-off body in the form of a cylinder with a conical section for regulating the flow area of flow, the actuator stem (see the patent of Russia №2064110, F 16 K 1/02, publ. in BI No. 20, 1996). Known needle valve with replaceable seat and needle, cone-parabolic, the regulatory authority (see Blagov E.YE., ivnitskii BJ Throttle valves fossil and nuclear power plants. - M.: Energoatomizdat, 1990, p.54, RIS).

The disadvantage of the devices is the difficulty of adjusting for large pressure drops across the valve at low cost operating environment, it is necessary to maintain a very small gap between the seat and the locking body (for triggering a greater portion of an input pressure), which creates difficulties in adjustment. While in the specified clearance are high flow rate, which leads to erosion of the surfaces of the valve seat and mating with a surface of the locking body further adjustment in the field of low cost becomes impossible, and shut-off function of the valve is lost. When hit solid particles from the fluid flow in the above the data gaps may damage the surfaces of the valve seat and valve body, and malfunction (loss stop function) valve. Based throttling based on the principle of inertial resistance (pressure loss associated with the inertial forces and blows jets environment). Change the conditional throughput characteristics require changes in the design of the valve.

Known multistage Ledovy valve for high flow rate, comprising a housing with an inlet, outlet, saddle-sleeve (cage) with radially perforated holes connected with the rod shut-off body in the form of perforated radial holes of the plunger associated with the saddle-sleeve (see valves Honeywell, Introl in the book. Blagov E.YE., ivnitskii BJ, Throttle control valves fossil and nuclear power plants. - M.: Energoatomizdat, 1990., p.58-61, 4.8, 4.10).

This valve has the advantage over the above-described analog, because by replacing the bushings (cells) can be modified conditional throughput characteristics (over a wide control range).

Disadvantages valve are: the complexity of design and manufacture (hundreds or thousands of holes needed to be done in the solid material of the bushing and plunger, often with erosion-resistant surfacing); to adjust in the field of low and extremely low costs is difficult because it is impossible to make thousands of holes of small diameter, less than 0.5...0.1 mm). Latitude adjustment range is limited, and when you change the word performance is necessary to replace the sleeve(cage) and(or) regulatory authority or make them larger. Thus, the functionality of the valve is limited. The valve cleavage type is not recommended for contaminated solids environments due to hit the last one in the friction zone of the plunger with Bush, increased wear of the friction surfaces and rapid failure (jamming of the plunger).

Objectives of the invention are: the extension of functionality by providing regulation in the areas of small and large spending environment, increased resistance in environments that contain solid particles, reducing the erosive wear of the elements of the throttling of the flow.

The technical result is achieved in that the regulating valve, comprising a housing with inlet, outlet and main holes, connected with the rod of the regulating element in the form of a piston which is installed with a gap in the main bore of the housing and has the ability to move coaxially located with him the main housing bore, the piston is made with outdoor relief, and the main hole with embossed inner surfaces, for example, in the form of a radial annular ribs or honeycomb.

The invention consists in that the use of embossed ribbed, cell surface of the piston and fixed holes can significantly reduce erosive wear on the hoist valve, to improve the operability of the valve in contaminated environments solid particles, since the valve has a constant relatively large clearance between the piston and the main hole, sufficient for the passage of solid particles with dimensions smaller than the size of the gap.

Brief description of drawings.

In figures 1, 2 shows a frontal cross-section of the complete valve in the working position, figure 3, 4 form a, B on the side surface of the piston, the inner surface of the main hole. Figure 5-10 presents the cross-section of the holes of the honeycomb and the intercostal space.

The regulating valve includes a housing 1 with an inlet 2, output 3, core 4 holes. With the rod 5 is connected to the control element in the form of the piston 6 with the axis 7, which has the ability to move coaxially located mostly the hole 4 with the axis 8 of the housing 1 and a diameter less than the diameter of the main hole 4. The outer part 9 of the piston 6 provided with a relief surface, for example, in the form of a radial annular ribs 10 (3), square, for example rectangular, square or hexagonal honeycomb 11 (figure 3). The annular ribs 10, cell 11 of the outer part 9 of the piston 6 can be performed with an inclination to the axis 7 of the piston 6 (Fig 3). The main hole 4 is made with a relief surface, for example, in the form of a radial annular ribs 12, honeycomb 13 (figure 4). The annular ribs 19, 12, cell 11, 13 mo the ut to be performed with an inclination to the axis 8 of the main hole 4 (2), and for dissimilar parts of the slope may be performed in opposite directions.

Cell 10, 12 may be with the internal multi-faceted prismatic shape, for example square shape, for example rectangular in normal cross-section or multi-faceted pyramid shape. The shape of the cross section of the honeycomb holes 11, 13 and the space between the edges 10, 12 shown in figure 5-10 and can be: with the radial location of the side walls (5, 6, 7), with sloped side walls (Fig, 9, 10), flat cylindrical in cross-section look the same) the shape of the bottom (6, 8), with the spherical shape of the bottom (6, 7, 9, 10), with a parallel arrangement of the internal surfaces is a multi - faceted (prismatic), cylindrical (figure 5, 6, 8, 9), with non-parallel inclined arrangement of the internal surfaces, for example with the formation of pyramidal or conical inner surface of the hole (7, 10). For intercostal space may be possible, with the cylindrical shape of the bottom (5, 8), with the toroidal shape of the bottom (6, 7, 9, 10), with a parallel arrangement of the inner surfaces of the ribs (5, 6, 8, 9) and non-parallel arrangement of the inner surfaces of the ribs (7, 10).

For the relief surfaces of the piston and fixed holes can be used: corrosion-resistant material, for example stainless steel, wear-resistant material is ial group, for example, the mineralokeramiki, erosive resistant material (steam, gas, corrosive environments), such as Stellite, simple materials, but with corrosion-resistant, erosive-resistant coating throughout the volume of the material.

The valve operates as follows.

The working medium enters through the inlet 2 into the main hole 4 to the piston 6, choked, passing through a slit formed in one of the main hole 4 and the outer surface 9 of the piston 6 in the form of ribs 10, 12, or grades 11, 3 (3, 4). In the stream environment is the emergence of smartcompany jets (vortices) in the wells of a cell or intercostal relief surface generated by the friction of viscous flow about the rigid surface, which increase the resistance of the channel to the channel environment, depending on the design features of the ridges (ribs) or honeycomb, form, size and crack size (see VAX Iageopete and other tornado-like energy exchange on the three-dimensional concave reliefs - self-organizing structure of currents, their visualization and mechanisms of body surface// Proceedings of the second Russian conference on heat transfer. V.6. ): And in MEI, 1998, pp.37-42). When this is triggered, a certain part of the input working pressure. The lower lowered the piston 6 in the hole 4, the greater the length of the channel duct environment, resistance to the passage of the working medium increases, per the pad on the valve at the same flow rate increases or at a constant differential pressure decreases the flow rate, passing through the valve. When the piston 6 is fully seated in the main hole 4, the resistance to the passage of a working environment as possible. The use of honeycomb 11, 13 allows you to tighten the design, which is important for large expenses, where large flow rate, as honeycombs are significant tangential effort on the part of the stream environment. In each well of cells 11, 13 are formed vortices - the tornadoes, the velocity vector which, when properly selected size of the holes is directed against the movement of the main flow, which leads to his dynamic damping, i.e. the vortex caused by flow around wells, reduces flow velocity and activated pressure environment. The implementation of the edges 10, 12, or grades 11, 13 inclined to the axis 7 of the piston 6 and to the axis 8 of the main hole 4 with the formation of an acute angle between their walls and the direction of flow (figure 2) increase the total braking the flow, the energy of the vortices and their velocities vectors directed against the flow. While the slopes of the edges 10, 12, cell 11, 13 on the piston 6 and the main hole 4 have opposite directions for the formation of an acute angle between the flow direction and the walls of the ribs and honeycomb.

The reduction of the gap between the piston 6 and the main hole 4 increases resistance to flow, not only by increasing the forces of viscous friction with increasing flow rate, but with the et increase energy vortexes, which is proportional to the speed of flow of degree > 2 are more readily repay the speed and power of the main stream because of the mutual oncoming traffic.

Running honeycomb 11, 13 multi-faceted, especially hexagonal, provides the greatest structural strength in the tangential direction, tetrahedral - greater adaptability and ease of manufacture. Running honeycomb flat and cylindrical bottom technologically, but when working with contaminating impurities hampered the evacuation of solid particles that can get into the stagnant corner zones (figure 5, 8). A more rational design of the cross section of the honeycomb with a spherical shape of the bottom (6, 7, 9, 10)that provides a self-cleaning cell of the honeycomb, and also provides the effect of increasing the speed and energy of the vortex by creating favorable to spin conditions on the spherical surface of the bottom of the wells. The above effects can be amplified due to the inclination of the lateral walls of the honeycomb (Fig.9) by improving the conditions of entrance to the main thread in the hole of the honeycomb and due to pyramidal, conical (figure 10), forms the inner surface of the hole, where no stagnant corner zones. For intercostal space, this means the execution of the form of the bottom section of the toroidal shape (6, 7, 9, 10) and with the conical shape of the section of the internal mejreberna the space (7, 10).

One of the features of the valve - low sensitivity to changes in the size of the gap when the erosive wear of the ribs and the ribs of the honeycomb embossed surface, changing the size of the gap decreases the resistance of the gap, but the basic is the right choice of the parameters of the edges and holes of the honeycomb to arrange vortices-tornadoes maximum power and speed for braking the main thread.

Another important feature of the valve - centering, adjust to any misalignment of the piston and the lack of self-oscillatory processes, since the radial centripetal forces acting on the piston side of the vortices, is very significant and the reduction of the gap in some place will lead to an increase in the radial component of the force acting on the piston in the same place, which will lead to its displacement and alignment of the gap, i.e. the adjust to any misalignment. The piston is constantly in a state of balance, so there is no effort to promote the education of its oscillatory movement, and means of vibration and noise, moreover, the valve reduces the available pressure pulsations of flow and stabilizes its output.

The main feature of the valve, the application of the principle of viscous friction and hydrodynamic damping rate of flow vortices that are formed in the wrapping thread relief cellular surface, in which codats is to minimize the wear of the elements of the valve, due to the distance from the wire surface (in the middle of the gap flow) of the process of collision of vortices with the main stream. The valve has a low level of noise and can operate in the condition of contamination of the working environment.

Valve has enhanced functionality by providing a wide range, variety of possible characteristics of regulation in the areas of small and large spending environment, low wear items throttling and opportunities to work with contaminated environments.

Valve design has a simplicity, as used in relief-porous materials that are typically used for sealing of turbomachines, so there is no need in the technological operations of drilling, firmware holes, with simplified manufacturing technology. Relief-porous surface can be obtained and methods of rolling, forging, pressing, wire EDM machining, etc.

Usually hit a few of the abrasive particles in the area of regulation or closing of the valve causes for its failure. In this case, the valve has the advantage because it is less sensitive to contamination of the working environment, the size of which is comparable to the gap between the piston and the main hole. Larger particles are removed from the gap by sticky in the hole hundred or intercostal issue is space.

This control valve can be used in systems, hydraulics, Pneumatics, energy, medicine.

1. The regulating valve, comprising a housing with inlet, outlet and main holes, connected with the rod of the regulating element in the form of a piston which is installed with a gap in the main bore of the housing and has the ability to move coaxially located with him the main housing bore, wherein the piston is made with outdoor relief, and the main hole with embossed inner surfaces, for example, in the form of a radial annular ribs or honeycomb.

2. The valve according to claim 1, characterized in that the ribs or honeycomb embossed surfaces of the piston and the main holes are made with an inclination to the axis of the piston and fixed holes in different directions.

3. The valve according to claim 1 or 2, characterized in that the honeycomb is made with internal polyhedral prism, for example, square shape, for example, rectangular in normal section, or many-sided pyramid shape.

4. The valve according to claim 1 or 2, characterized in that the honeycomb is made with an internal cylindrical, conical or spherical surface of the hole.

5. The valve according to claim 1 or 2, characterized in that the intercostal space is made with non-parallel, for example, a conical shape of the inner wall of the donut is enoy the inner surface of the bottom.



 

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