A Compact Labyrinth Control Valve with High Adjustable Ratio and Sleeve Assembly

Abstract

The present invention belongs to the technical field of control valves, and particularly relates to a compact labyrinth control valve with a high adjustable ratio and a sleeve assembly. A compact labyrinth control valve with a high adjustable ratio and a sleeve assembly, which comprises a valve body, a replaceable special-shaped valve seat, a sleeve assembly, a special-shaped plunger valve core, a sealing gasket, a valve stem and a valve cover. The technical solution of the present invention has the following advantages compared with the prior art: it enhances the adjustability under small opening and high pressure difference, improves the adjustment accuracy and adjustable ratio; reduces the radial width of the laminated sheet, reduces the production cost of the control valve; the laminated sheet is replaceable, and the maintenance is convenient; it has functions of vibration reduction, noise reduction and cavitation prevention.

Description

Technical Field

[0001] The present invention belongs to the technical field of regulating valves, and particularly relates to a compact labyrinth regulating valve with a high adjustable ratio and a sleeve assembly. Background Art

[0002] In order to prevent phenomena such as cavitation and noise from occurring in regulating valves applied to high-pressure difference working conditions during use, a labyrinth structure with a multi-stage pressure reduction function is often adopted in design. In existing labyrinth regulating valves, each labyrinth flow channel is basically machined on a lamination. The regulating valve composed of this lamination structure has two main disadvantages: on the one hand, there is a dead zone in the regulating valve, and the flow coefficient has a sudden change during the regulation process; on the other hand, the flow channels arranged on a single lamination cannot be circumferentially arranged under the requirement of a large flow coefficient, and the width of the lamination is large under a high pressure reduction stage number, which in turn leads to a large middle cavity of the valve body, and is not conducive to the economy, portability, and compact design of the regulating valve. Summary of the Invention

[0003] Aiming at the problems existing in the prior art, the present invention provides a compact labyrinth regulating valve with a high adjustable ratio and a sleeve assembly.

[0004] The present invention aims to achieve two functions. On the one hand, it realizes the regulation accuracy and adjustable ratio at a small opening of the valve, which is specifically achieved by an irregular plunger valve core and a labyrinth flow channel; on the other hand, while providing a high pressure reduction stage number, it reduces the radial width of the lamination, which is specifically achieved by the staggered superposition of through holes and straight slots distributed on different laminations. The through holes between adjacent laminations or between the through holes and the straight slots are arranged in a radial offset, forming a plurality of semi-arch multi-stage pressure reduction flow channels in the direction perpendicular to the lamination. This longitudinally arranged labyrinth pressure reduction flow channel can significantly reduce the radial width of the lamination, and at the same time has the functions of vibration reduction, noise reduction, and cavitation prevention.

[0005] The specific technical solution adopted by the present invention is as follows:

[0006] A compact labyrinth regulating valve with a high adjustable ratio and a sleeve assembly, which includes a valve body, a replaceable irregular valve seat, a sleeve assembly, an irregular plunger valve core, a sealing gasket, a valve stem, and a valve cover.

[0007] The sleeve assembly includes a lower lamination, N equal-thickness middle laminations (N≥10), and an upper lamination; two rows of circumferentially distributed semi-straight slots are machined on the lowermost layer of the equal-thickness middle laminations, which are respectively connected to the inner and outer flow channels of the sleeve assembly, a circumferentially distributed straight slot is machined on the uppermost layer of the equal-thickness middle laminations, and the remaining equal-thickness middle laminations are machined with multiple rows of circumferentially distributed through holes and straight slots;

[0008] The outer surface of the plunger spool is a cylindrical surface within the range of 0%-50% of the adjustable height of the spool, and the flow rate is adjusted by relying on the sleeve assembly. The outer surface within the range of 50%-100% of the adjustable height of the spool is a variable curvature radius surface calculated according to the flow coefficient requirements, and the flow rate is adjusted by relying on the plunger spool.

[0009] Preferably, the through holes on the adjacent equal-thickness middle laminations or between the through holes and the straight slot openings are arranged in a radial offset manner, and the formed flow area is less than half of the minimum flow area of the through holes.

[0010] Preferably, the through holes have equal diameters, and the arc radius of the straight slot opening is equal to the radius of the through hole.

[0011] Preferably, the number of pressure reduction stages during the rise or fall of a single longitudinal maze flow channel does not exceed 6 stages.

[0012] Preferably, at an integer multiple of one-tenth of the adjustable height of the plunger spool, the number of maze flow channels is an integer.

[0013] Preferably, one-tenth of the adjustable height of the plunger spool is an integer multiple of the thickness of the equal-thickness middle lamination.

[0014] Preferably, circular holes with a diameter of 1 mm are machined on both sides of the symmetry plane of the regulating valve on different laminations of the sleeve assembly and are fixed by a fixed shaft.

[0015] The technical solution of the present invention has the following advantages compared with the prior art:

[0016] (1) It enhances the adjustability under small opening and high pressure difference, and improves the regulation accuracy and adjustable ratio;

[0017] (2) It reduces the radial width of the lamination and lowers the production cost of the regulating valve;

[0018] (3) The lamination is replaceable and the maintenance is convenient;

[0019] (4) It has functions of vibration reduction, noise reduction and cavitation prevention. Description of the Drawings

[0020] Figure 1 is a half-sectional view of the compact maze regulating valve involved in the present invention;

[0021] Figure 2 is a half-sectional view of the plunger spool of the compact maze regulating valve designed by the present invention;

[0022] Figure 3 is a schematic diagram of the sleeve assembly involved in the present invention; (a) perspective view; (b) half-sectional view; (c) description of the maze flow channel;

[0023] Figure 4 is a schematic diagram of the first lamination of the equal-thickness middle lamination of the sleeve assembly involved in the present invention;

[0024] Figure 5 Schematic diagram of the uppermost lamination of the equal-thickness middle laminations of the sleeve assembly related to the present invention;

[0025] FIG. 6 is a schematic diagram of the key equal-thickness middle laminations in the sleeve assembly of the present invention. (a) The fourth lamination; (b) The fifth lamination.

[0026] In the figure: 1. Valve body, 2. Sealing gasket, 3. Replaceable special-shaped valve seat, 4. Sleeve assembly, 5. Special-shaped plunger valve core, 6. Valve stem, 7. Sealing gasket, 8. Valve cover. Detailed implementation manners

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] As Figure 1 shown, in this embodiment, a highly adjustable compact labyrinth regulating valve includes a valve body 1, a replaceable special-shaped valve seat 3, a sleeve assembly 4, a special-shaped plunger valve core 5, sealing gaskets 2 and 7, a valve stem 6, and a valve cover 8. Among them, the sleeve assembly is composed of a lower lamination 41, N equal-thickness middle laminations 42 (N≥10), and an upper lamination 43.

[0029] As Figure 2 shown, the outer surface of the plunger valve core is a cylindrical surface within the range of 0%-50% of the adjustable height of the valve core, which does not play a role in flow regulation. The outer surface within the range of 50%-100% of the adjustable height of the valve core is a variable curvature radius surface calculated according to the flow coefficient requirements, which plays a role in flow regulation.

[0030] As shown in FIG. 3, in the sleeve assembly, the number of lower laminations is 1, the number of equal-thickness middle laminations is 13, and the number of upper laminations is 1; the thickness of the equal-thickness middle laminations is one-tenth of the adjustable height of the plunger valve core; the through holes on adjacent equal-thickness middle laminations or between the through holes and the straight slot openings are arranged staggeredly, and the formed overlapping area is less than half of the area of the smallest through hole.

[0031] Taking the selection of the number of pressure reduction stages as 5 during the upward process of the longitudinal labyrinth flow channel as an example for illustration. After the medium enters the outer semi-straight slot opening of the first lamination, it flows upward through the outer row of through holes of the second, third, and fourth laminations, and then enters the straight slot opening of the fifth lamination and changes the flow direction to flow downward. After flowing through the inner row of through holes of the second, third, and fourth laminations, it enters the inner semi-straight slot opening of the first lamination, and finally completes the flow of a semi-arch labyrinth flow channel. The labyrinth flow of other laminations is the same.

[0032] Similarly, taking the selection of the number of pressure reduction stages as 5 during the upward process of the longitudinal labyrinth flow channel, the opening method on each equal-thickness middle lamination 42 is described. AsFigure 4 As shown in Figure 6, the equal-thickness middle laminations 42.1 are machined with two rows of circumferentially distributed semi-straight notches; the equal-thickness middle laminations 42.2 - 42.4 are machined with two rows of circumferentially distributed semi-straight notches and through holes; the equal-thickness middle laminations 42.5 - 42.10 are machined with two rows of circumferentially distributed semi-straight notches, through holes and circumferentially distributed straight notches; the equal-thickness middle laminations 42.11 - 42.12 are machined with two rows of circumferentially distributed through holes and circumferentially distributed straight notches; the equal-thickness middle lamination 42.13 is machined with circumferentially distributed straight notches. Each equal-thickness middle lamination 42 is machined with a circular hole 421 with a diameter of 1 mm, and can be fixed to the lower lamination and the upper lamination through a fixed shaft.

[0033] The above specific embodiments are used to explain and illustrate this patent, rather than to limit this patent. Any modifications and changes made to this patent within the spirit and scope of the claims of this patent fall within the protection scope of this patent.

Claims

1. A compact labyrinth control valve with a high adjustable ratio, characterized in that: It mainly includes a valve body (1), a replaceable special-shaped valve seat (3), a sleeve assembly (4), and a special-shaped plunger valve core (5); The sleeve assembly (4) includes a lower lamination (41), N middle laminations (42) with equal thickness, where N ≥ 10, and an upper lamination (43). The lower lamination (41), the middle laminations with equal thickness (42), and the upper lamination (43) are all cylindrical, and their inner and outer diameters are equal. The middle laminations with equal thickness (42) are processed with m rows of circumferentially arranged through holes, p rows of circumferentially arranged straight notch openings, and two rows of circumferentially arranged semi-straight notch openings according to different discharge orders from bottom to top. m ≥ 2, p ≥ 1. The two rows of semi-straight notch openings on the middle laminations with equal thickness (42) are respectively connected to the inner and outer flow channels of the sleeve assembly and serve as the inlets and outlets of the labyrinth flow channel. The through holes between adjacent laminations and between the through holes and the straight notch openings on the middle laminations with equal thickness (42) are arranged in a staggered manner to form a longitudinal labyrinth flow channel perpendicular to the lamination direction, and the overlapping area is less than half of the area of the smallest through hole; During the upward process of the longitudinal labyrinth flow channel, the pressure reduction level is 5 levels. After the medium enters the outer semi-straight notch opening of the first layer of middle laminations with equal thickness, it flows upward through the outer row of through holes of the second, third, and fourth layers of middle laminations with equal thickness, then enters the straight notch opening of the fifth layer of middle laminations with equal thickness and changes the flow direction to flow downward. After flowing through the inner row of through holes of the second, third, and fourth layers of middle laminations with equal thickness, it enters the inner semi-straight notch opening of the first layer of middle laminations with equal thickness, and finally completes the flow of a semi-arch labyrinth flow channel; The outer surface of the special-shaped plunger valve core (5) is a cylindrical surface within the range of 0% - 50% of the adjustable height of the valve core and does not play a role in flow regulation. The outer surface is a variable curvature radius surface calculated according to the flow coefficient requirement within the range of 50% - 100% of the adjustable height of the valve core and plays a role in flow regulation; The through holes on the middle laminations with equal thickness (42) are circular, rectangular, square, or triangular; The arc radius R of the through holes and the straight notch openings on the middle laminations with equal thickness (42) is adjustable; One-tenth of the adjustable height of the plunger valve core (5) is an integer multiple of the thickness of a single middle lamination with equal thickness (42); Two circular holes (421) with a diameter of 1 mm are processed on each lamination of the sleeve assembly (4) and are arranged on both sides of the symmetry plane of the regulating valve. The relative positions between the laminations are ensured by connecting with a fixed shaft; The height of the replaceable special-shaped valve seat (3) is less than the inner wall thickness of the valve body, and the inner surface of the replaceable special-shaped valve seat (3) is a variable-diameter hole.

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