A circular-arc type recessed blade tip for inhibiting blade tip leakage vortex and a vane pump having the same

Abstract

The application discloses a circular-arc groove blade tip for inhibiting blade tip leakage vortex and a blade pump with the same. The circular-arc groove blade tip is arranged in a pump shell and has a gap between the circular-arc groove blade tip and the pump shell. The circular-arc groove blade tip forms a circular-arc surface, and the circular-arc groove blade tip is provided with a groove. According to the circular-arc groove blade tip for inhibiting blade tip leakage vortex, the groove is arranged on the circular-arc surface of the circular-arc groove blade tip, so that fluid can flow into the groove to form vortex flow when the fluid works on the circular-arc groove blade tip. The fluid flowing through the blade tip gap can be inhibited, the gap leakage vortex in the flow channel can be reduced, the probability of mutual interference between the gap leakage vortex and the main flow can be reduced, the working efficiency of the blade can be improved, the stability of the blade work can be improved, and the overall performance of the blade pump can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pumps, in particular to a circular-arc groove blade tip for suppressing blade tip leakage vortex and a blade pump with the same. BACKGROUND

[0002] A pump is a kind of hydraulic machinery, which can transmit mechanical rotation kinetic energy to fluid to increase fluid energy for the purpose of conveying fluid or increasing fluid pressure. In the related art, there is a gap between the blade top and the pump shell. When the blade rotates to do work, fluid flows from the pressure side of the blade to the suction side of the blade through the blade tip gap under the action of pressure difference, so as to induce gap leakage vortex. The gap leakage vortex and the main flow in the impeller interfere and mix with each other, which easily causes more complex vortex motion and deterioration of the flow state in the impeller, thereby reducing the overall performance of the pump. Therefore, how to reduce the blade tip gap leakage vortex has certain research space. SUMMARY

[0003] The present application aims to at least solve one of the technical problems in the prior art. To this end, one object of the present application is to provide a circular-arc groove blade tip for suppressing blade tip leakage vortex, which can reduce blade tip gap leakage vortex and improve the overall performance of the blade pump.

[0004] The present application also provides a blade pump with a circular-arc groove blade tip for suppressing blade tip leakage vortex.

[0005] According to the circular-arc groove blade tip for suppressing blade tip leakage vortex of the first aspect of the present application, the circular-arc groove blade tip is arranged in the pump shell and has a gap with the pump shell. The circular-arc groove blade tip forms a circular-arc surface, and the circular-arc groove blade tip is provided with a groove.

[0006] According to the circular-arc groove blade tip for suppressing blade tip leakage vortex of the present application, the groove is arranged on the circular-arc surface of the circular-arc groove blade tip, so that the fluid can flow into the groove to form vortex when the circular-arc groove blade tip does work. The flow of fluid through the blade tip gap can be suppressed, the gap leakage vortex in the flow passage can be reduced, the probability of mutual interference between the gap leakage vortex and the main flow can be reduced, the working efficiency of the blade can be improved, the stability of the blade work can be improved, and the overall performance of the blade pump can be improved. By arranging the groove on the circular-arc groove blade tip to reduce the gap leakage vortex, the structure of the blade can be simplified, the blade can be easily processed, and the adaptability of the blade can be improved, so that the blade can be applied to various blade pumps.

[0007] According to some embodiments of the present application, a plane is defined, the plane is perpendicular to the width direction of the circular-arc groove tip, and the circular-arc groove tip is projected on the plane; a center line is defined, the projection of the circular-arc groove tip on the plane is symmetrical about the center line; on the plane, the intersection point of the groove bottom and the center line is the coordinate zero point, and on the center line, the distance between the coordinate zero point and the pump shell is δ, the center line is the Y axis, the line perpendicular to the center line and passing through the coordinate zero point is the X axis, and on the X axis, the minimum thickness dimension of the circular-arc groove tip is b, wherein the control equation of the projection curve of the circular-arc surface of the circular-arc groove tip on the plane is y=a(x-b)(x+b), and a=-0.5δ / b2.

[0008] In some examples, the projection of the groove on the plane is semicircular, and the diameter of the semicircle is δ.

[0009] In some examples, the circular-arc groove tip comprises a body part and a tip part, the tip part is arranged on the side of the body part facing the pump shell and connected with the body part, the side surface of the tip part away from the body part forms a circular-arc surface, and the groove is arranged on the tip part, wherein on the X axis, the maximum thickness dimension of the tip part is greater than the maximum thickness dimension of the body part.

[0010] In some examples, on the X axis, the thickness dimension of the body part is b.

[0011] In some examples, on the X axis, the part of the tip part protruding from the body part forms a protrusion, the protrusion has a first side surface close to the body part, and the first side surface is an arc surface.

[0012] In some examples, on the plane, the first side surface and the circular-arc surface of the circular-arc groove tip intersect to form an acute angle.

[0013] In some examples, the first side surface is tangent to the side wall surface of the body part.

[0014] In some examples, the first side surface is a circular-arc surface with a radius of 0.5b, the distance between the center of the first side surface and the Y axis is b, and the distance between the center of the first side surface and the X axis is 0.5b.

[0015] The vane pump with the circular-arc groove tip of the second aspect embodiment of the present application comprises a pump housing and the circular-arc groove tip of the first aspect embodiment of the present application. By using the circular-arc groove tip, the gap leakage vortex in the flow passage can be reduced, the probability of the mutual interference between the gap leakage vortex and the main flow can be reduced, the operation efficiency of the vane pump can be improved, the stability of the vane pump operation can be improved, and the overall performance of the vane pump can be improved.

[0016] Additional aspects and advantages of the present application will be made apparent from the following description of embodiments of the present application, which is given for the purpose of explanation and illustration only, and will be appreciated by those skilled in the art. BRIEF DESCRIPTION OF DRAWINGS

[0017] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description of embodiments of the present application, taken in conjunction with the accompanying drawings in which:

[0018] Figure 1 is a schematic view of a partial structure of a vane pump according to some embodiments of the present application;

[0019] Figure 2 is a schematic view of a three-dimensional structure of a circular-arc groove tip according to some embodiments of the present application.

[0020] REFERENCE NUMERALS

[0021] Vane pump 100, center line n, coordinate zero point O,

[0022] Circular-arc groove tip 10, body portion 11, tip portion 12, first side surface 121, groove 122,

[0023] Pump housing 20. DETAILED DESCRIPTION

[0024] Embodiments of the present application are described in detail below with reference to the attached drawings, which are given by way of example and are not limitative of the present application. In the drawings, like reference numerals indicate like elements throughout the several views.

[0025] In the description of the present application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0026] In the description of the present application, it needs to be understood that the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] Reference will now be made to the following description Figures 1-2 The arc-shaped groove tip 10 for suppressing tip leakage vortex according to the embodiment of the present application is described.

[0028] As Figures 1-2 shown, the arc-shaped groove tip 10 for suppressing tip leakage vortex according to the embodiment of the present application is the top of the blade, the whole blade is arranged inside the pump shell 20, that is, the arc-shaped groove tip 10 is located on the side of the blade close to the pump shell 20, and there is a gap between the arc-shaped groove tip 10 and the pump shell 20, when the blade rotates to work in the pump shell 20, the fluid can flow from the pressure side (such as the front side shown in Figure 1 ) of the arc-shaped groove tip 10 to the suction side (such as the rear side shown in Figure 1 ) of the arc-shaped groove tip 10 through the gap.

[0029] Among them, the arc-shaped groove tip forms an arc surface, and the arc surface protrudes in the direction close to the pump shell 20 (such as the direction from bottom to top shown in Figure 1 ), which can reduce the tip gap, and in turn can reduce the leakage amount of the fluid, at the same time, the arc surface can guide the flow of the fluid, so as to reduce the load of the arc-shaped groove tip when the fluid flows through the tip gap, and can reduce the flow intensity of the leakage fluid, which is beneficial to reduce the probability of occurrence of the gap leakage vortex.

[0030] The circular-arc groove tip is provided with a groove 122, and fluid can flow into the groove 122 when flowing through the tip gap, so that a vortex is formed at the groove 122, the flow of fluid from the pressure side of the circular-arc groove tip 10 to the suction side of the circular-arc groove tip 10 can be inhibited, the leakage amount of fluid can be reduced, the gap leakage vortex in the flow passage can be reduced, the pressure pulsation in the tip gap can be inhibited, the working efficiency of the blade can be improved, and the stability of the blade operation can be improved.

[0031] According to the circular-arc groove tip 10 for inhibiting tip leakage vortex provided by the embodiment of the present application, the groove 122 is arranged on the circular-arc surface of the circular-arc groove tip 10, so that fluid can flow into the groove 122 to form a vortex when the blade is working, the flow of fluid through the tip gap can be inhibited, the gap leakage vortex in the flow passage can be reduced, the probability of mutual interference between the gap leakage vortex and the main flow can be reduced, the working efficiency of the blade can be improved, the stability of the blade operation can be improved, and the overall performance of the blade pump 100 can be improved; and the groove 122 is arranged on the circular-arc groove tip to reduce the gap leakage vortex, so that the structure of the blade can be simplified, the blade is convenient to process, and the adaptability of the blade can be improved, so that the blade can be applied to various blade pumps 100.

[0032] As shown in Figure 1 and Figure 2 According to some embodiments of the present application, a plane is defined, the plane is perpendicular to the width direction (such as the left-right direction shown in Figure 2 ) of the circular-arc groove tip, the circular-arc groove tip 10 is projected on the plane, a center line n is defined, the projection of the circular-arc groove tip 10 on the plane is symmetrical about the center line n, and on the plane, the intersection point of the groove bottom of the groove 122 and the center line n is the coordinate zero point O, and on the center line n, the distance between the coordinate zero point O and the pump shell 20 is δ, the center line n is the Y axis, the straight line perpendicular to the center line n and passing through the coordinate zero point O is the X axis, and on the X axis, the minimum thickness size of the circular-arc groove tip 10 is b.

[0033] The control equation of the projection curve of the circular-arc surface of the circular-arc groove tip on the plane is y=a(x-b)(x+b), and a=-0.5δ / b2; it can be understood that if b and δ are increased respectively, the projection curve of the circular-arc surface of the circular-arc groove tip on the plane tends to be gentle, which is easy to increase the leakage amount of fluid, and if b and δ are reduced respectively, the projection curve of the circular-arc surface of the circular-arc groove tip on the plane tends to be steep, which is conducive to reducing the leakage amount of fluid; thus, by reducing the tip gap before the groove 122 is arranged and by reducing the minimum thickness size of the circular-arc groove tip 10, the leakage amount of fluid can be reduced, the gap leakage vortex in the flow passage can be reduced, the probability of mutual interference between the gap leakage vortex and the main flow can be reduced, and the stability of the blade operation can be improved.

[0034] As shown in Figure 1 In some examples, the projection of the groove 122 on the plane is semicircular, and the diameter of the semicircle is δ, that is, in the XOY coordinate system, the semicircular groove tip is milled to form a groove 122 with a smooth inner wall, with the center of the circle being the coordinate point (0, 0.5δ) and the radius being 0.5δ, which is beneficial for the fluid to enter the groove 122 and form a vortex in the groove 122 to reduce the leakage amount of the fluid at the tip gap, and is also convenient for processing.

[0035] It should be noted that before the groove 122 is opened, the gap between the highest point of the semicircular groove tip and the pump housing 20 is 0.5δ. On the basis of reducing the tip gap, the size of the groove 122 can be increased, which is beneficial for the fluid to enter the groove 122 to form a vortex before flowing through the tip gap, can reduce the leakage amount of the fluid, reduce the gap leakage vortex in the flow passage, and can suppress the pressure pulsation in the tip gap, thereby improving the working efficiency of the blade and improving the stability of the blade operation.

[0036] As shown in Figure 1 In some examples, the semicircular groove tip 10 includes a body portion 11 and a tip portion 12, the tip portion 12 is arranged on the side of the body portion 11 facing the pump housing 20 (as shown in the upper side Figure 1 The tip portion 12 is connected to the body portion 11, and the side of the tip portion 12 away from the body portion 11 (as shown in the upper side Figure 1 The groove 122 is arranged on the upper side of the tip portion 12, so that the fluid can enter the groove 122 to form a vortex before flowing through the tip gap, which is beneficial for reducing the gap leakage vortex in the flow passage.

[0037] In the X axis, the maximum thickness dimension of the tip portion 12 is greater than the maximum thickness dimension of the body portion 11, which can increase the flow passage length of the tip gap, thereby weakening the pressure gradient in the tip gap, weakening the entrainment of the leakage vortex on the gap leakage flow, thereby suppressing the pressure pulsation in the tip gap and reducing the gap leakage vortex in the flow passage, which is beneficial for improving the working efficiency of the blade and improving the stability of the blade operation; it can be understood that the body portion 11 and the tip portion 12 are integrally formed, which can improve the structural strength of the semicircular groove tip 10 and is convenient for processing, which is beneficial for reducing the processing cost.

[0038] As shown in Figure 1 In some examples, in the X axis, the thickness dimension of the body portion 11 is b, that is, the two side surfaces of the body portion 11 in the thickness direction (as shown in the front-rear direction Figure 1 The structure of the blade can be simplified, processing is convenient, and the processing cost can be reduced.

[0039] As shown in Figure 1As shown, in some examples, on the X-axis, a portion of the blade top 12 protrudes from the main body 11 to form a bulge, which can increase the thickness of the blade top 12 and increase the flow path length of the blade tip gap, thereby weakening the pressure gradient in the blade tip gap and weakening the suction effect of the leakage vortex on the gap leakage flow, thereby suppressing the pressure pulsation in the blade tip gap and reducing the gap leakage vortex in the flow path, which is beneficial to improving the working efficiency of the blade and improving the stability of the blade operation.

[0040] The protrusion has a first side surface 121 close to the main body 11, that is, the first side surface 121 is located on the side of the blade top 12 close to the main body 11 (such as Figure 1 The first side surface 121 is located on the outer side of the main body portion 11 (as shown in FIG. Figure 1 The front and rear sides shown in the figure), the first side surface 121 is a curved surface, which can improve the guiding effect on the fluid flow direction, reduce the impact of the fluid on the blade top 12, and thus reduce the speed change of the fluid at the arc-shaped groove blade top, which is beneficial to hinder the fluid from flowing through the blade top gap, and is beneficial to optimizing the pressure difference between the pressure side and the suction side of the blade, thereby reducing the leakage of the fluid, reducing the gap leakage vortex in the flow channel, improving the stability of the blade operation, and reducing the energy loss of the vane pump 100 during operation.

[0041] like Figure 1 As shown, in some examples, on a plane, the first side surface 121 and the arc surface of the arc-shaped groove blade tip intersect to form a sharp angle, and the arc-shaped groove blade tip 10 is formed in the thickness direction (such as Figure 1 Sharp corners are set on both sides (in the front-to-back direction as shown), so that the flow of the mainstream fluid is smoother, and the load on the arc-shaped groove blade top can be reduced, the flow intensity of the fluid leakage at the arc-shaped groove blade top is reduced, and the leakage vortex is hindered from contacting the fluid on the suction side of the blade body, which is beneficial to reducing the energy loss of the vane pump 100 during operation.

[0042] like Figure 1 As shown, in some examples, the first side surface 121 is tangent to the side wall of the main body 11, so that the transition between the side wall of the blade top 12 and the side wall of the main body 11 is smoother, thereby making the arc-shaped groove blade top 10 smoother in the thickness direction (such as Figure 1 The side walls on both sides (in the front-to-back direction as shown) are smoother, which can reduce the resistance to the fluid and help improve the working efficiency of the blade.

[0043] like Figure 1As shown in some examples, the first side surface 121 is a circular arc surface with a radius of 0.5b, and the distance between the center of the circular arc surface and the Y axis is b, and the distance between the center of the circular arc surface and the X axis is 0.5b, that is, in the XOY coordinate system, the coordinate point (-b, -0.5b) and the coordinate point (b, 0.5b) are taken as the centers of the circular arc surface, and the radius of the circular arc surface is 0.5b, and the blade top 12 is milled to form a smooth first side surface 121, which can reduce the resistance of the fluid and improve the working efficiency of the blade.

[0044] As shown in some examples, Figure 2 and Figure 1 As shown in some examples, Figure 1 The front-rear direction shown in the figure is the thickness direction of the circular arc groove blade top 10, as shown in Figure 2 The up-down direction shown in the figure is the length direction (the extension direction of the circular arc groove blade top) of the circular arc groove blade top 10, as shown in Figure 1 The left-right direction shown in the figure is the width direction of the circular arc groove blade top 10; or, as shown in Figure 2 The up-down direction shown in the figure is the width direction of the circular arc groove blade top 10, as shown in Figure 1 The left-right direction shown in the figure is the length direction (the extension direction of the circular arc groove blade top) of the circular arc groove blade top 10.

[0045] As shown in some examples, ​ The blade pump 100 with the circular arc groove blade top for suppressing blade top leakage vortex according to the embodiment of the present application includes a pump housing 20 and a circular arc groove blade top 10 for suppressing blade top leakage vortex. By using the circular arc groove blade top 10 described above, the gap leakage vortex in the flow passage can be reduced, the probability of mutual interference between the gap leakage vortex and the main flow can be reduced, the operation efficiency of the blade pump 100 can be improved, the stability of the operation of the blade pump 100 can be improved, and the overall performance of the blade pump 100 can be improved.

[0046] Other configurations and operations of the blade pump 100 according to the embodiment of the present application are known to those skilled in the art, and will not be described in detail here. In the description of the present application, "a first feature" and "a second feature" can include one or more features. Among them, the up-down direction, the left-right direction and the front-rear direction are based on the up-down direction, the left-right direction and the front-rear direction shown in the figure.

[0047] In the description of the present application, unless otherwise explicitly specified and limited, the first feature is "above" or "below" the second feature, which can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is "above", "above" and "above" the second feature, which includes that the first feature is directly above and obliquely above the second feature, or only means that the first feature is higher than the second feature in height.

[0048] In the description of the specification, reference to "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" means that a particular feature, structure, material or characteristic is included in at least one embodiment or example of the present application. The appearances of the phrases "in one embodiment", "in some embodiments", "in an embodiment", "for example", "specific example" or "in some examples" in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0049] Although embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, alternatives and variations to these embodiments could be made without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A circular-arc shaped squealer tip for suppressing tip leakage vortex, characterized by, The circular-arc groove tip is arranged in the pump housing and has a gap with the pump housing, the circular-arc groove tip forms a circular-arc surface, and the circular-arc groove tip is provided with a circular-arc groove; A plane is defined, the plane is perpendicular to the width direction of the circular-arc groove tip, and the circular-arc groove tip is projected on the plane; A center line is defined, the projection of the circular-arc groove tip on the plane is symmetrical about the center line; On the plane, the intersection point of the groove bottom and the center line is a coordinate zero point, and on the center line, the distance between the coordinate zero point and the pump housing is δ, the center line is the Y axis, a line perpendicular to the center line and passing through the coordinate zero point is the X axis, and on the X axis, the minimum thickness size of the circular-arc groove tip is b, The projection curve control equation of the circular-arc surface of the circular-arc type groove tip on the plane is ; The circular-arc groove tip comprises a body part and a tip part, the tip part is arranged on the side of the body part facing the pump housing and connected with the body part, the side surface of the tip part away from the body part forms a circular-arc surface, and the groove is arranged in the tip part.

2. The circular-arc shaped squealer tip for suppressing tip leakage vortex according to claim 1, wherein The projection of the groove on the plane is semicircular, and the diameter of the semicircle is δ.

3. The circular-arc shaped squealer tip of claim 1, wherein On the X axis, the maximum thickness size of the tip part is greater than the maximum thickness size of the body part.

4. The circular-arc shaped squealer tip of claim 3, wherein On the X axis, the thickness size of the body part is b.

5. The circular-arc shaped squealer tip of claim 3, wherein On the X axis, a part of the tip part protruding from the body part forms a protrusion, the protrusion has a first side surface close to the body part, and the first side surface is an arc surface.

6. The circular-arc shaped squealer tip of claim 5, wherein On the plane, the first side surface and the circular-arc surface of the circular-arc groove tip intersect to form an acute angle.

7. The circular-arc shaped squealer tip of claim 5, wherein The first side surface is tangent to the side wall surface of the body part.

8. The circular-arc shaped squealer tip of claim 5, wherein The first side surface is an arc surface with a radius of 0.5b, the distance between the center of the first side surface and the Y axis is b, and the distance between the center of the first side surface and the X axis is 0.5b.

9. A vane pump having a circular-arc type recessed tip of a vane with a tip leakage vortex suppressed, characterized by, The circular-arc groove tip for suppressing tip leakage vortex comprises a pump housing and the circular-arc groove tip according to any one of claims 1-8.

Images