A roller vane pump

Abstract

The present invention discloses a roller vane pump, which comprises a roller (1), a stator (2), a rotor (3), an upper end cover (4) and a lower end cover (5); the inner profile line (201) of the stator (2) includes 8 curves, which are in sequence: top circular arc AB, first transition curve BC, first Archimedean spiral CD, second transition curve DE, bottom circular arc EF, third transition curve FG, second Archimedean spiral GH, and fourth transition curve HA, and the adjacent curves of each section are smoothly connected; two Archimedean spirals and four transition curves are adopted to connect the top circular arc AB and the bottom circular arc EF, so as to ensure the continuity of the second derivative of the radius vector at each connection point of the inner profile line (201) of the stator, thereby ensuring no impact during the working process; the formed closed working chamber for pressurizing the liquid has an annular shape, and the rotation of the rotor in this part does not change the volume of the closed working chamber, thereby avoiding the problem of water hammer, and at the same time having good sealing performance.

Description

Technical Field

[0001] The present invention relates to a positive displacement rotary pump, in particular to a roller vane pump. Background Art

[0002] Roller vane pumps are widely used in machine tool equipment, hydraulic transmission, construction machinery and chemical machinery fields, and are particularly suitable for automotive continuously variable transmissions. Roller vane pumps have the characteristics of simple structure, small friction and wear, low failure rate and long service life. A roller vane pump includes rollers, a stator, a rotor, an upper end cover and a lower end cover; the rotor is installed inside the stator. As the rotor rotates, the rollers contact the inner side of the stator under the action of centrifugal force, forming multiple periodically changing working chambers, thereby realizing the suction, pressurization and discharge of liquid; in the liquid discharge area, energy acts directly on the liquid in the form of dynamic pressure and discharges it; at the same time, due to the rotation of the rotor, the volume of the working chamber gradually increases in the liquid suction area, forming a low pressure, so that the liquid is continuously sucked in.

[0003] The patent with the publication number CN101052806A proposes a roller vane pump, which designs the inner profile of the stator by changing the angular indexing of each arc segment. This pump has a relatively large volume, but there are inflection points in the transition section of the inner profile of the stator. The second derivative of the radius vector of the inner profile of the stator is discontinuous at each connection point, with sudden changes in speed and acceleration, so the friction and wear are relatively large, and it is easy to cause vibration and noise. At the same time, the problem of water hammer is likely to occur due to the incompressibility of the liquid and the reduction of the volume of the closed working chamber. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a roller vane pump, the inner profile of whose stator consists of 8 curves: top arc AB, first transition curve BC, first Archimedean spiral CD, second transition curve DE, bottom arc EF, third transition curve FG, second Archimedean spiral GH, fourth transition curve HA, and the adjacent curves of each segment are smoothly connected; two Archimedean spirals and four transition curves are used to connect the top arc AB and the bottom arc EF, ensuring the continuity of the second derivative of the radius vector of the inner profile (201) of the stator at each connection point, so as to ensure that no rigid impact occurs during the working process. The inner profile (201) of the stator includes the concentric top arc AB and bottom arc EF. The rotor (3) is installed concentrically with the stator (2), and the closed working chamber formed for pressurizing the liquid has an annular shape. The rotation of the rotor in this part does not change the size of the volume of the closed working chamber, thus avoiding the generation of the water hammer problem, and at the same time, the working chamber has good sealing performance. There are two liquid suction ports and two liquid discharge ports. The reasonable combination of the liquid suction ports, liquid discharge ports and the inner profile of the stator improves the flow rate and prevents the water hammer problem that is likely to occur due to the reduction of the volume of the closed working chamber during the liquid pressurization process.

[0005] The technical solution adopted by the present invention to solve its technical problems is as follows:

[0006] A roller vane pump includes a roller (1), a stator (2), a rotor (3), an upper end cover (4) and a lower end cover (5). The inner profile curve (201) of the stator (2) of the stator includes 8 curves, which are in turn: the top arc AB, the first transition curve BC, the first Archimedean spiral CD, the second transition curve DE, the bottom arc EF, the third transition curve FG, the second Archimedean spiral GH, and the fourth transition curve HA; the adjacent curves of each section are smoothly connected, and the second derivative of the radius vector at each connection point of the adjacent curves of each section is continuous; the inner profile curve (201) of the stator (2) has a symmetry axis Z-axis, and the inner profile curve (201) of the stator is symmetric about the symmetry axis Z-axis on the left and right; the first transition curve BC and the fourth transition curve HA are symmetric about the Z-axis on the left and right, the second transition curve DE and the third transition curve FG are symmetric about the Z-axis on the left and right, and the first Archimedean spiral CD and the second Archimedean spiral GH are symmetric about the Z-axis on the left and right; the top arc AB and the bottom arc EF share the same center of the circle, and the center point is the rotation center O point; the stator (2) and the rotor (3) are concentrically installed, and the upper end cover (4) and the lower end cover (5) are respectively installed on both axial sides of the stator (2); five identical U-shaped grooves are provided on the rotor (3), and the five U-shaped grooves are rotationally symmetric about the rotation center O point at 72°.

[0007] A roller vane pump, with the rotation center O point as the origin to establish a coordinate system, the equations of the component curves of the inner profile curve (201) of the stator (2) are as follows:

[0008] ① The polar coordinate equation of the top arc AB is:

[0009] Where, R1—the radius of the top arc, mm;

[0010] ② The polar coordinate equation of the bottom arc EF is:

[0011] Where, R2—the radius of the bottom arc, mm;

[0012] ③ The polar coordinate equation of the first Archimedean spiral CD is:

[0013] Where, a and b are constants, which are determined by the following system of equations:

[0014]

[0015] Where, the value range of δ1 is 0.08 to 0.10 mm, and the value range of δ2 is 0.09 to 0.11 mm;

[0016] ④ The polar coordinate equation of the first transition curve BC is:

[0017]

[0018] Wherein, c0, c1, c2, c3, c4, c5 are constants, which are determined by the following system of equations:

[0019]

[0020] ⑤ The polar coordinate equation of the second Archimedean spiral GH is:

[0021] ⑥ The polar coordinate equation of the second transition curve DE is:

[0022]

[0023] Wherein, m0, m1, m2, m3, m4, m5 are constants, which are determined by the following system of equations:

[0024]

[0025] ⑦ The polar coordinate equation of the third transition curve FG is:

[0026] ⑧ The polar coordinate equation of the fourth transition curve HA is:

[0027] Above: t - polar angle, rad; ρ - radius vector, mm.

[0028] A roller vane pump has a single - side liquid suction and single - side liquid discharge structure; two liquid suction ports are opened on the upper end cover (4): the first liquid suction port (401) and the second liquid suction port (402); during operation, the outer contour of the first liquid suction port (401) coincides with the third transition curve FG, the second Archimedean spiral GH and the fourth transition curve HA on the inner stator profile (201) of the stator (2); two liquid discharge ports are opened on the lower end cover (5): the first liquid discharge port (501) and the second liquid discharge port (502); during operation, the outer contour of the first liquid discharge port (501) coincides with the first transition curve BC, the first Archimedean spiral CD and the second transition curve DE on the inner stator profile (201) of the stator (2).

[0029] The beneficial effects of the present invention are:

[0030] ① The inner stator profile (201) of the proposed roller vane pump stator (2) is continuous and smooth, and the second derivative of the radius vector is continuous. During operation, it reduces the friction and wear between the roller (1) and the inner stator profile (201), eliminates the impact points between the roller (1) and the inner side of the stator (2), and there are no sudden changes in the speed and acceleration of the roller (1) during operation. As a result, noise and vibration are reduced, and the reliability and lifespan of the roller vane pump are improved.

[0031] ② The inner stator profile (201) of the proposed roller vane pump includes a top circular arc AB and a bottom circular arc EF with a common center. The rotor (3) is concentrically installed with the stator (2), and the enclosed working chamber formed for pressurizing the liquid has an annular shape. In this part, the rotation of the rotor (3) does not change the volume of the enclosed working chamber; the reasonable combination of the liquid suction port, liquid discharge port, and the inner stator profile (201) prevents the liquid hammer problem that is likely to occur due to the reduction of the enclosed volume during the liquid pressurization process, and at the same time, the working chamber has good sealing performance.

[0032] ③ The inner stator profile (201) of the stator (2) includes eight curves, which can increase the liquid suction volume of the roller vane pump and also enrich the types of the inner stator profile. Description of the Drawings

[0033] Figure 1 It is a three-dimensional structure diagram of the proposed roller vane pump.

[0034] Figure 2 It is a two-dimensional structure diagram of the proposed roller vane pump.

[0035] Figure 3 It is a diagram of the inner stator profile (201) of the stator (2).

[0036] Figure 4 It is a diagram of the rotor (3).

[0037] Figure 5 It is a diagram of the upper end cover (4).

[0038] Figure 6 It is a diagram of the lower end cover (5).

[0039] Figure 7 It is a diagram at the end moment of the liquid suction process of the inner stator working chamber.

[0040] Figure 8 It is a diagram at the end moment of the liquid suction process of the U-shaped groove working chamber.

[0041] Figure 9 It is a diagram of the clearance volume at the end of the liquid discharge process.

[0042] Figure 10 It is a diagram of the clearance volume when the liquid suction process is about to start.

[0043] In the figure: 1 - roller; 2 - stator; 3 - rotor; 4 - upper end cover; 5 - lower end cover; 201 - inner profile line of the stator; R1 - radius of the top arc; R2 - radius of the bottom arc; 401 - first liquid suction port; 402 - second liquid suction port; 501 - first liquid discharge port; 502 - second liquid discharge port; A1 - maximum volume of the working chamber on the inner side of the stator; A2 - maximum volume of the working chamber of the U-shaped groove; AB - top arc, BC - first transition curve, CD - first Archimedean spiral, DE - second transition curve, EF - bottom arc, FG - third transition curve, GH - second Archimedean spiral, HA - fourth transition curve. Detailed implementation manners

[0044] The present invention will be further described below in conjunction with the accompanying drawings.

[0045] As Figure 1 shown, it is a three-dimensional structure diagram of the proposed roller vane pump, including a roller (1), a stator (2), a rotor (3), an upper end cover (4) and a lower end cover (5).

[0046] As Figure 2 shown, it is a two-dimensional structure diagram of the proposed roller vane pump. Five identical U-shaped grooves are provided on the rotor (3), and a roller (1) is installed in each U-shaped groove; the stator (2) is concentrically installed with the rotor (3), and the upper end cover (4) and the lower end cover (5) are respectively installed on both axial sides of the stator (2). During operation, with the rotation of the rotor, the roller (1) contacts the inner side of the stator (2) under the action of centrifugal force, forming multiple periodically changing working chambers, thereby realizing the suction, pressurization and discharge of the liquid.

[0047] As Figure 3 shown, it is a diagram of the inner profile line (201) of the stator (2). The inner profile line (201) of the stator (2) includes 8 curves, which are in sequence: top arc AB, first transition curve BC, first Archimedean spiral CD, second transition curve DE, bottom arc EF, third transition curve FG, second Archimedean spiral GH, fourth transition curve HA, and the adjacent curves of each section are smoothly connected; the second derivative of the radius vector of the inner profile line (201) of the stator (2) at each connection point is continuous.

[0048] The equation of the inner profile line (201) of the stator (2) is:

[0049] ① The polar coordinate equation of the top arc AB is:

[0050] wherein, R1 - radius of the top arc, mm;

[0051] ② The polar coordinate equation of the bottom arc EF is:

[0052] wherein, R2—the radius of the bottom arc, mm;

[0053] ③ The polar coordinate equation of the first Archimedean spiral CD is:

[0054] wherein, a and b are constants determined by the following system of equations:

[0055]

[0056] wherein, the value range of δ1 is 0.08 to 0.10 mm, and the value range of δ2 is 0.09 to 0.11 mm;

[0057] ④ The polar coordinate equation of the first transition curve BC is:

[0058]

[0059] wherein, c0, c1, c2, c3, c4, and c5 are constants determined by the following system of equations:

[0060]

[0061] ⑤ The polar coordinate equation of the second Archimedean spiral GH is:

[0062] ⑥ The polar coordinate equation of the second transition curve DE is:

[0063]

[0064] wherein, m0, m1, m2, m3, m4, and m5 are constants determined by the following system of equations:

[0065]

[0066] ⑦ The polar coordinate equation of the third transition curve FG is:

[0067] ⑧ The polar coordinate equation of the fourth transition curve HA is:

[0068] Above: t—polar angle, rad; ρ—radius vector, mm.

[0069] As Figure 4 shown, it is a diagram of the rotor (3). There are five identical U-shaped grooves on the rotor (3), and the five U-shaped grooves are rotationally symmetric about the rotation center O point by 72°.

[0070] As Figure 5As shown in the figure, it is a diagram of the upper end cover (4). There are two liquid suction ports on the upper end cover (4): the first liquid suction port (401) and the second liquid suction port (402). The outer contour of the first liquid suction port (401) coincides with the third transition curve FG, the second Archimedean spiral GH, and the fourth transition curve HA of the stator inner profile line (201) of the stator (2).

[0071] As Figure 6 shown in the figure, it is a diagram of the lower end cover (5). There are two liquid discharge ports on the lower end cover (5): the first liquid discharge port (501) and the second liquid discharge port (502). The outer contour of the first liquid discharge port (501) coincides with the first transition curve BC, the first Archimedean spiral CD, and the second transition curve DE of the stator inner profile line (201) of the stator (2).

[0072] As Figure 7 shown in the figure, it is a diagram of the end moment of the liquid suction process in the inner working cavity of the stator. The roller (1), the inner side of the stator (2), and the rotor (3) form a closed inner working cavity of the stator. The shaded part A1 represents the maximum volume of the inner working cavity of the stator, and the radius of the top arc AB corresponding to this part does not change, forming an annular working cavity. In this part, the rotation of the rotor does not change the volume of the inner working cavity of the stator, thus avoiding the problem of liquid hammer in the inner working cavity of the stator, and at the same time having good sealing performance.

[0073] As Figure 8 shown in the figure, it is a diagram of the end moment of the liquid suction process in the U-shaped groove working cavity. The roller (1) and the rotor (3) form a closed U-shaped groove working cavity. The shaded part A2 represents the maximum volume of the U-shaped groove working cavity, and the radius of the top arc AB corresponding to this part does not change, forming an annular working cavity. In this part, the rotation of the rotor does not change the volume of the U-shaped groove working cavity, thus avoiding the problem of liquid hammer in the U-shaped groove, and at the same time having good sealing performance.

[0074] As Figure 9 shown in the figure, it is a diagram of the clearance volume at the end of the liquid discharge process. At the end of the liquid discharge, the roller (1) is just tangent to the liquid discharge terminal curve of the two liquid discharge ports, and at this time the liquid is just discharged, and no liquid hammer phenomenon will occur.

[0075] As Figure 10 shown in the figure, it is a diagram of the clearance volume at the moment when the liquid suction process is about to start. At this time, the roller (1) is just tangent to the liquid suction start curve of the liquid suction port and starts to suck in the liquid.

[0076] Although the specific implementation manners of the present invention are described above in conjunction with the accompanying drawings, it is not a limitation to the protection scope of the present invention. Those skilled in the art should understand that based on the technical solutions of the present invention, various modifications or deformations that can be made by those skilled in the art without creative efforts are still within the protection scope of the present invention.

Claims

1. A roller vane pump, comprising a roller (1), a stator (2), a rotor (3), an upper end cover (4) and a lower end cover (5), characterized in that: The inner stator profile (201) of the stator (2) includes 8 curves, which are in sequence: top circular arc AB, first transition curve BC, first Archimedean spiral CD, second transition curve DE, bottom circular arc EF, third transition curve FG, second Archimedean spiral GH, and fourth transition curve HA; adjacent curves of each section are smoothly connected, and the second derivative of the radius vector at each connection point of adjacent curves of each section is continuous; the inner stator profile (201) of the stator (2) has a symmetry axis Z-axis, and the inner stator profile (201) is symmetric about the symmetry axis Z-axis left and right; the first transition curve BC and the fourth transition curve HA are symmetric about the Z-axis left and right, the second transition curve DE and the third transition curve FG are symmetric about the Z-axis left and right, and the first Archimedean spiral CD and the second Archimedean spiral GH are symmetric about the Z-axis left and right; the top circular arc AB and the bottom circular arc EF share the same center of the circle, and the center point is the center of rotation O; the stator (2) and the rotor (3) are concentrically installed, and an upper end cover (4) and a lower end cover (5) are respectively installed on both axial sides of the stator (2); five identical U-shaped grooves are formed on the rotor (3), and the five U-shaped grooves are rotationally symmetric at 72° about the center of rotation O. Taking the center of rotation O as the origin to establish a coordinate system, the equations of the component curves of the inner stator profile (201) of the stator (2) are as follows: ① The polar coordinate equation of the top arc AB is: ρ AB (t) = R1, where, R1—the radius of the top circular arc, mm; ② The polar coordinate equation of the bottom arc EF is: ρ EF (t) = R2, where, R2—the radius of the bottom circular arc, mm; ③ The polar coordinate equation of the first Archimedean spiral CD is: ρ CD (t) = a + bt, where, a and b are constants, which are determined by the following system of equations: where, the value range of δ1 is 0.08 - 0.10 mm, and the value range of δ2 is 0.09 - 0.11 mm; ④ The polar coordinate equation of the first transition curve BC is: ρ BC (t) = c0 + c1t + c2t 2 + c3t 3 + c4t 4 + c5t 5 , where, c0, c1, c2, c3, c4, c5 are constants, which are determined by the following system of equations: ⑤ The polar coordinate equation of the second Archimedean spiral GH is: ρ GH (t) = ρ CD (π - t), ⑥ The polar coordinate equation of the second transition curve DE is: ρ DE (t) = m0 + m1t + m2t 2 + m3t 3 + m4t 4 + m5t 5 , where, m0, m1, m2, m3, m4, m5 are constants, which are determined by the following system of equations: ⑦ The polar coordinate equation of the third transition curve FG is: ρ FG (t) = ρ DE (π - t), ⑧ The polar equation of the fourth transition curve HA is: ρ HA (t) = ρ BC (π - t), Above: t—polar angle, rad; ρ—radius vector, mm; The described roller vane pump has a single-sided liquid suction and single-sided liquid discharge structure; two liquid suction ports are opened on the upper end cover (4): the first liquid suction port (401) and the second liquid suction port (402); during operation, the outer contour of the first liquid suction port (401) coincides with the third transition curve FG, the second Archimedean spiral GH, and the fourth transition curve HA on the inner stator profile (201) of the stator (2); two liquid discharge ports are opened on the lower end cover (5): the first liquid discharge port (501) and the second liquid discharge port (502); during operation, the outer contour of the first liquid discharge port (501) coincides with the first transition curve BC, the first Archimedean spiral CD, and the second transition curve DE on the inner stator profile (201) of the stator (2).

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