A guide vane angle adjustable cylinder device

Abstract

The present invention discloses a cylindrical device with adjustable guide vane angles. The device comprises a cylindrical body, a plurality of guide vanes, and an annular top cover. The inner circumference of the cylindrical body is provided with a plurality of evenly spaced semicircular recesses for angle adjustment, with each guide vane sequentially mounted in a respective semicircular recess. The annular top cover coaxially covers the cylindrical body and positions each guide vane. The device of the present invention addresses the existing issue of inducer inlet backflow. Each guide vane in the device can be independently adjusted in angle to reduce backflow vortexes at the inducer inlet, thereby effectively improving the overall performance of the pump.

Description

Technical Field

[0001] The invention relates to an adjustable cylinder device, relates to the field of centrifugal pumps, and in particular to a cylinder device with adjustable guide vane angles. Background Art

[0002] One effective way to improve the cavitation performance and operational stability of a centrifugal pump's main impeller is to install an inducer in front of the pump. Because the impeller flow path in high-speed centrifugal pumps is narrow and long, backflow vortices are easily generated at the inducer inlet. These vortices consume significant energy, reduce pump efficiency, and generate pressure pulsations, leading to vibration and noise. Therefore, it is necessary to improve the backflow vortex at the inducer inlet to effectively improve the pump's overall performance. Summary of the Invention

[0003] In order to solve the problems existing in the background technology, the present invention provides a guide vane angle adjustable cylindrical device. The device of the present invention can improve the backflow vortex at the inlet of the inducer, thereby effectively improving the overall performance of the pump.

[0004] The technical solution adopted in the present invention is:

[0005] The guide vane angle-adjustable cylinder device of the present invention comprises a cylinder, a plurality of guide vanes and an annular top cover. The inner circumference of the cylinder is evenly spaced with a plurality of semicircular recesses for angle adjustment. Each guide vane is sequentially installed in a respective semicircular recess. The annular top cover coaxially covers the cylinder and limits the position of each guide vane. The cylinder device is installed in the upstream pipeline of the inducer of the centrifugal pump through the cylinder.

[0006] The guide vane is plate-shaped and has a teardrop-shaped cross-section composed of a triangle and a semicircle. One side of the guide vane in the longitudinal direction is semi-cylindrical and serves as a connecting side and is provided with a through hole in the axial direction. The ports of the through hole are respectively a first circular hole and a second circular hole. A plurality of semi-cylindrical arc-shaped protrusions are evenly provided along the outer circumference at one end of the connecting side close to the first circular hole, and the length direction of each arc-shaped protrusion is parallel to the circumference of the through hole; the connecting side of the guide vane is installed in the semi-circular recess and is limited in the cylinder and the annular top cover by the first circular hole and the second circular hole.

[0007] The semicircular recess of the cylinder is a semi-cylindrical groove, and the length direction of each semicircular recess is parallel to the axial direction of the cylinder. A first limiting cylinder is provided in one end of the semicircular recess, and a semi-cylindrical arc-shaped groove that makes the angle of the guide vane adjustable is evenly opened in the circumferential direction at the other end of the semicircular recess. The other parts of the semicircular recess are smooth arc segments, and the length direction of each arc-shaped groove is parallel to the axial direction of the cylinder; the first limiting cylinder is sleeved in the second circular hole of each guide vane, and each arc-shaped protrusion of the guide vane is embedded in a respective arc-shaped groove and performs position conversion in each arc-shaped groove, and the guide vane is connected to the annular top cover through the first circular hole.

[0008] The circular periphery of one side of the annular top cover is coaxially connected to the connecting groove of the circular periphery of one side of the cylinder through a connecting protrusion. A plurality of second limiting cylinders are evenly spaced on the circular periphery of one side of the annular top cover, and each second limiting cylinder is sleeved in the first circular hole of a respective guide vane.

[0009] The number of the arc-shaped grooves in the cylinder is smaller than the arc-shaped protrusions in the guide vane, so that the guide vane can be installed in the semicircular recess at different angles.

[0010] A plurality of angle scale lines are provided on the circumferential surface of one side of the cylinder body to which each arc-shaped groove in the cylinder body is close, and each angle scale line faces a respective arc-shaped groove, and the scale line of the guide vane parallel to the central axis of the teardrop-shaped cross section of the guide vane to which the first circular hole of the guide vane is close is oriented toward each angle scale line; when the guide vane rotates in the semicircular recess, the angle of rotation of the guide vane is determined by the various angle scale lines and the scale lines.

[0011] The beneficial effects of the present invention are:

[0012] The device of the present invention aims to improve the existing problem of backflow at the inducer inlet. Each guide vane of the device can independently adjust the angle to reduce the backflow vortex at the inducer inlet, thereby effectively improving the overall performance of the pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is an exploded view of the device of the present invention;

[0014] Figure 2 It is a schematic diagram of the cylinder of the device of the present invention;

[0015] Figure 3 is a schematic diagram of the guide vanes of the device of the present invention;

[0016] Figure 4 It is a schematic diagram of the scale lines of the device of the present invention;

[0017] In the figure: 1. Cylinder, 11. Semicircular recess, 111. Arc-shaped groove, 12. Angle scale line, 13. First limiting cylinder, 14. Connecting groove, 2. Guide vane, 21. Arc-shaped protrusion, 22. Scale line, 23. First circular hole, 24. Second circular hole, 3. Angle top cover, 31. Connecting protrusion, 32. Second limiting cylinder. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1 As shown, the guide vane angle adjustable cylinder device of the present invention comprises a cylinder 1, a plurality of guide vanes 2 and an annular top cover 3. The inner circumference of the cylinder 1 is evenly spaced with a plurality of semicircular recesses 11 for angle adjustment. Each guide vane 2 is sequentially installed in a respective semicircular recess 11. The annular top cover 3 coaxially covers the cylinder 1 and limits the position of each guide vane 2. The cylinder device is installed in the upstream pipeline of the inducer of the centrifugal pump through the cylinder 1. Figure 3 As shown, the guide vane 2 is plate-shaped and has a teardrop-shaped cross-section composed of a triangle and a semicircle. One side of the guide vane 2 in the longitudinal direction is semi-cylindrical and serves as a connecting side and is provided with a through hole in the axial direction. The ports of the through hole are respectively a first circular hole 23 and a second circular hole 24. A plurality of semi-cylindrical arc-shaped protrusions 21 are evenly provided along the outer circumference at one end of the connecting side close to the first circular hole 23. The length direction of each arc-shaped protrusion 21 is parallel to the circumference of the through hole. The connecting side of the guide vane 2 is installed in the semi-circular recess 11 and is limited in the cylinder 1 and the annular top cover 3 by the first circular hole 23 and the second circular hole 24.

[0020] like Figure 2As shown, the semicircular recess 11 of the cylinder 1 is a semi-cylindrical groove, and the length direction of each semicircular recess 11 is parallel to the axial direction of the cylinder 1. A first limiting cylinder 13 is provided in one end of the semicircular recess 11, and a semi-cylindrical arc-shaped groove 111 is evenly opened in the circumferential direction at the other end of the semicircular recess 11 to adjust the angle of the guide vane 2. The other parts of the semicircular recess 11 are smooth arc segments, and the length direction of each arc-shaped groove 111 is parallel to the axial direction of the cylinder 1; the first limiting cylinder 13 is sleeved in the second circular hole 24 of each guide vane 2, and each arc-shaped protrusion 21 of the guide vane 2 is embedded in a respective arc-shaped groove 111 and performs position conversion in each arc-shaped groove 111, and the guide vane 2 is connected to the annular top cover 3 through the first circular hole 23. The circular periphery of the annular top cover 3 is coaxially connected to the connecting groove 14 on the circular periphery of the cylinder body 1 via a connecting protrusion 31. Several second limiting cylinders 32 are evenly spaced on the circular periphery of the annular top cover 3. Each second limiting cylinder 32 is inserted into the first circular hole 23 of a respective guide vane 2. The number of arc-shaped grooves 111 in the cylinder body 1 is smaller than the number of arc-shaped protrusions 21 in the guide vane 2, allowing the guide vane 2 to be installed in the semicircular recess 11 at different angles.

[0021] like Figure 4 As shown, a plurality of angle scale lines 12 are provided on the circumferential surface of one side of the cylinder 1 close to each arc-shaped groove 111 in the cylinder 1, and each angle scale line 12 faces a respective arc-shaped groove 111. The first circular hole 23 of the guide vane 2 faces a scale line 22 of the guide vane 2 parallel to the central axis of the teardrop-shaped cross section of the guide vane 2, and the scale line 22 faces each angle scale line 12. When the guide vane 2 rotates in the semicircular recess 11, the angle of rotation of the guide vane 2 is determined by the various angle scale lines 12 and the scale lines 22.

[0022] A scale line 22 is provided on the symmetry axis of the blade shape of the guide vane 2, and an angle scale line 12 is provided on the bottom surface of the circular ring on the inner side of the front end of the cylinder 1 near the semicircular recess 11. The angle adjustment range is ±(the number of arc-shaped protrusions 21-the number of arc-shaped grooves 111) ÷ 2×the angle between two adjacent arc-shaped grooves 111. The angle can be designed, preferably 5 degrees, and the angle adjustment of each guide vane 2 does not interfere with each other and is adjusted separately.

[0023] This embodiment operates as follows: guide vanes 2 are individually adjusted to the desired angle and then installed in cylinder 1. An annular top cover 3 is then installed to prevent the guide vanes 2 from moving or rotating relative to cylinder 1. The present invention is installed in the upstream pipeline of a centrifugal pump and coaxially with the inducer or centrifugal pump impeller. In a preferred embodiment, cylinder 1 and the pipeline are threaded together. After installation, annular top cover 3 is located at the end away from the inducer. By installing the present invention in front of the inducer of a centrifugal pump, the backflow at the inlet of the centrifugal pump inducer is affected by the guide vanes 2, thereby destroying the vortex structure, thereby improving the flow pattern of the centrifugal pump inlet and reducing backflow at the inducer inlet.

[0024] The above description of the present invention and its embodiments is non-limiting, and the actual embodiments are not limited thereto. In short, if a person skilled in the art is inspired by the above description and, without departing from the purpose of the present invention, designs structures and embodiments similar to the technical solution without creatively designing, they shall fall within the scope of protection of the present invention.

Claims

1. A guide vane angle adjustable cylinder device, characterized by: The invention comprises a cylinder (1), a plurality of guide vanes (2) and an annular top cover (3); the inner circumference of the cylinder (1) is evenly spaced with a plurality of semicircular recesses (11) for angle adjustment; each guide vane (2) is sequentially installed in a respective semicircular recess (11); the annular top cover (3) is coaxially covered on the cylinder (1) and limits each guide vane (2); the cylinder device is installed in the upstream pipeline of the inducer of the centrifugal pump through the cylinder (1); The guide vane (2) is plate-shaped and has a teardrop-shaped cross section consisting of a triangle and a semicircle. One side of the guide vane (2) in the longitudinal direction is semi-cylindrical and serves as a connecting side and is provided with a through hole in the axial direction. The ends of the through hole are respectively a first circular hole (23) and a second circular hole (24). A plurality of semi-cylindrical arc-shaped protrusions (21) are evenly provided along the outer circumference of one end of the connecting side close to the first circular hole (23). The length direction of each arc-shaped protrusion (21) is parallel to the circumference of the through hole. The connecting side of the guide vane (2) is installed in the semi-circular recess (11) and is limited in the cylinder (1) and the annular top cover (3) through the first circular hole (23) and the second circular hole (24). The semicircular recess (11) of the cylinder (1) is a semi-cylindrical groove, the length direction of each semi-circular recess (11) is parallel to the axial direction of the cylinder (1), a first limiting cylinder (13) is provided in one end of the semi-circular recess (11), and semi-cylindrical arc-shaped grooves (111) are uniformly opened along the circumference in the other end of the semi-circular recess (11) so that the angle of the guide vane (2) can be adjusted, and the length direction of each arc-shaped groove (111) is parallel to the axial direction of the cylinder (1); the first limiting cylinder (13) is sleeved in the second circular hole (24) of each guide vane (2), each arc-shaped protrusion (21) of the guide vane (2) is embedded in a respective arc-shaped groove (111) and performs position conversion in each arc-shaped groove (111), and the guide vane (2) is connected to the annular top cover (3) through the first circular hole (23).

2. The guide vane angle adjustable cylinder device according to claim 1, characterized in that: The circular periphery of one side of the annular top cover (3) is coaxially connected to the circular periphery of one side of the cylinder (1), and a plurality of second limiting cylinders (32) are evenly spaced on the circular periphery of one side of the annular top cover (3), and each second limiting cylinder (32) is sleeved in the first circular hole (23) of a respective guide vane (2).

3. The guide vane angle adjustable cylinder device according to claim 1, characterized in that: The number of the arc-shaped grooves (111) in the cylinder (1) is smaller than the number of the arc-shaped protrusions (21) in the guide vane (2).

4. The guide vane angle adjustable cylinder device according to claim 1, characterized in that: A plurality of angle scale lines (12) are provided on a peripheral surface of one side of the cylinder (1) adjacent to each arc-shaped groove (111) in the cylinder (1), each angle scale line (12) faces a respective arc-shaped groove (111), and a scale line (22) of the guide vane (2) parallel to the central axis of the teardrop-shaped cross section of the guide vane (2) adjacent to the first circular hole (23) of the guide vane (2), and the scale line (22) faces each angle scale line (12); when the guide vane (2) rotates in the semicircular recess (11), the angle of rotation of the guide vane (2) is determined by the angle scale lines (12) and the scale lines (22).

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