Rotary vane pump with guide slots

Abstract

This utility model relates to the field of vane pump technology, and discloses a rotary vane pump with guide grooves, including a housing with an outwardly facing pump inlet and pump outlet; a rotor rotatably disposed inside the housing, with the rotor center offset towards the pump inlet; multiple vanes evenly distributed along the circumference of the rotor, each vane's inner end hinged to the rotor rim via a hinge; a pair of cover plates covering the upper and lower sides of the housing; a pair of guide grooves located on the inner sides of the upper and lower cover plates, the guide grooves being closed loops and eccentrically arranged with respect to the rotor; and a connecting member located at the outer end of each vane and embedded in the upper and lower guide grooves, used to guide the vane to swing around its hinge point when the rotor rotates, causing a change in the chamber volume and realizing the transport of fluid from the pump inlet to the pump outlet. This utility model avoids direct friction between the vanes and the housing, reducing wear and extending service life. The vanes are made of rigid or flexible materials, making it widely applicable and improving the pump's volumetric efficiency and reliability.

Description

Technical Field

[0001] This utility model relates to the field of vane pump technology, and in particular to a rotary vane pump with guide groove. Background Technology

[0002] The commonly used oscillating vane pump, also known as a sliding vane pump, works by having vanes oscillate outwards under centrifugal force, while simultaneously forming a dynamic sealed cavity constrained by the cylinder body contour. When the vanes oscillate to the suction zone, the volume of the sealed cavity gradually increases, creating a partial vacuum, and oil is drawn into the cavity through the inlet. As the rotor continues to rotate, when the vanes oscillate to the pressure zone, the cylinder body contour forces the vanes to swing back towards the rotor center, reducing the volume of the sealed cavity. The oil pressure inside the cavity increases and is forced out through the outlet to the system. Each vane completes one suction and pressure cycle per rotor revolution, achieving continuous oil delivery.

[0003] Existing vane pumps, such as Figure 1 The blades (vanes) are mounted on the upper slots of the rotor. The rotor 1 and the housing 3 are eccentrically arranged with an eccentricity of e. As the rotor 1 rotates, the vanes 2 reciprocate relative to the rotor in the rotor slots. To maintain a seal and contact, the vanes 2 and the housing 3 generally slide. Rolling motion of balls is also sometimes used. Some blades have a certain angle of inclination with the rotor, and the extension line of the slot does not pass through the center of the rotor. (See...) Figure 2 Some vane pumps use a method where vanes are mounted on grooves in the housing and reciprocate in motion, see... Figure 3 These existing technologies, due to the contact and relative movement between the rotor groove and the vane, and between the vane and the housing, and the high rotor speed, inevitably lead to wear between the vane, the rotor, and the housing. The blades need to withstand the combined load of radial centrifugal force and contact reaction force, so high rigidity materials (such as metals) must be used. If flexible materials are used, they are prone to deformation and failure, and there are problems such as poor sealing, large volume leakage, and low volumetric efficiency.

[0004] A Chinese patent with publication number CN2890421Y discloses a rotary vane pump. This pump features vanes with one end hinged to the rotor and the other end in contact with the pump casing. However, this type of pump relies primarily on gravity or spring force to achieve a seal between the vanes and the casing. Consequently, vane wear is significant, and the sealing efficiency is poor. Summary of the Invention

[0005] The purpose of this invention is to provide a rotary vane pump with guide grooves, which solves the problems of poor sealing of the oscillating vanes, rapid wear between the vanes and the casing, sharp drop in volumetric efficiency after wear, high noise, short lifespan, and the limitation of materials to high-rigidity metals.

[0006] This utility model provides the following technical solution:

[0007] A rotary vane pump with guide grooves, comprising:

[0008] The housing (8) has a pump inlet (7) and a pump outlet (6) facing outwards;

[0009] The rotor (5) is rotatably disposed inside the housing (8), and the center of the rotor (5) is offset toward the pump inlet (7);

[0010] Multiple blades (3) are evenly distributed along the circumference of the rotor (5), and the inner end of each blade (3) is hinged to the rim of the rotor (5) by a hinge (9);

[0011] A pair of cover plates (10) cover the upper and lower sides of the housing (8) respectively;

[0012] The guide grooves (2) are a pair, respectively located on the inner side of the upper and lower cover plates (10). The guide grooves (2) are closed rings and are eccentrically arranged with respect to the rotor (5).

[0013] A connector is provided at the outer end of each blade (3) and embedded in the guide groove (2) above and below, for guiding the blade (3) to swing around its hinge point when the rotor (5) rotates, so that the volume of the chamber (4) between adjacent blades (3) changes, thereby realizing the delivery of fluid from the pump inlet (7) to the pump outlet (6).

[0014] According to some possible implementations, the connector includes a connecting post (1), the upper and lower ends of which are respectively embedded in the upper and lower guide grooves (2).

[0015] According to some possible implementations, the connecting component includes ball bearings (11) or sliding bearings with outer spherical surfaces disposed on the upper and lower sides of the outer end of the blade (3), wherein the ball bearings (11) or the sliding bearings are embedded in the guide groove (2) and can roll or slide along it.

[0016] According to some possible implementations, the guide groove (2) is a circular closed-loop structure.

[0017] According to some possible implementations, the blade (3) is a rectangular sheet structure.

[0018] According to some possible implementations, the blade (3) is made of a rigid material or a flexible material.

[0019] According to some possible implementations, the rim of the rotor (5) is provided with a plurality of grooves for accommodating the inner end hinge structure of the blade (3).

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This utility model provides a rotary vane pump with guide grooves. The outer edge of the vane is guided to the housing via the guide grooves. The pump employs a connecting column or a structure with added balls or bearings, avoiding direct friction or relative movement between the outer edge of the vane and the housing, thus extending the service life of the vane. The vane can be made of either rigid or flexible materials, making it suitable for a wide range of applications and at a lower cost. Attached Figure Description

[0022] Figure 1 The diagram shows the blade arrangement of a conventional vane pump mentioned in the background art of this application (the component numbers in the diagram are not the component numbers of this application).

[0023] Figure 2 This is a blade diagram of an existing vane pump mentioned in the background art of this application.

[0024] Figure 3 The diagram shows the blade arrangement of a certain existing vane pump mentioned in the background art of this application (the component numbers in the diagram are not the component numbers of this application).

[0025] Figure 4 A cross-sectional view of a rotary vane pump with guide grooves provided in an embodiment of this utility model.

[0026] Figure 5 A partial view of the blade connection provided for an embodiment of this utility model.

[0027] Figure 6 A schematic diagram of the rotor provided for an embodiment of this utility model.

[0028] Figure 7 This is a schematic diagram of a rotor with cover plates on both the top and bottom, provided in an embodiment of the present invention.

[0029] Figure 8 A schematic diagram of the housing and guide groove provided for an embodiment of this utility model.

[0030] Figure 9 A schematic diagram of the guide groove on the cover plate provided in an embodiment of this utility model.

[0031] Figure 10 This is a schematic diagram of a guide groove embedded by balls on the outer side of the blade, provided as an embodiment of the present invention.

[0032] Figure 11 This is a partial view of the ball bearing insertion guide groove provided in an embodiment of the present invention.

[0033] In the picture:

[0034] 1-Connecting column, 2-Guide groove, 3-Blade, 4-Cavity, 5-Rotor, 6-Pump outlet, 7-Pump inlet, 8-Housing, 9-Hinge, 10-Cover plate, 11-Ball bearing. Detailed Implementation

[0035] The present invention will now be described in detail with reference to the embodiments and accompanying drawings. However, it should be understood that the embodiments and accompanying drawings are for illustrative purposes only and do not constitute any limitation on the scope of protection of the present invention. All reasonable modifications and combinations that fall within the inventive spirit of the present invention are within the scope of protection of the present invention.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] Example 1

[0039] This embodiment provides a rotary vane pump with guide grooves; please refer to the appendix. Figures 4 to 7 The cylindrical housing 8 has a pair of pump outlets 6 and pump inlets 7 facing outwards. Inside the housing 8 is a rotor 5 for driving rotation. Both the upper and lower surfaces of the housing 8 are provided with cover plates 10 for sealing. Figures 7 to 9The inner sides of both the upper and lower cover plates are provided with circular guide grooves 2. Eight rectangular blades 3 are evenly distributed around the circumference of the rotor 5. The inward-facing end of each blade 3 is fixed to one of eight grooves on the rim of the rotor 5 via a hinge 9. A connecting post 1 is provided at the outer end of each blade 3, and the connecting post 1 moves within the corresponding closed annular guide grooves 2. The guide grooves 2 and the rotor 5 are eccentrically arranged. The blades 3 rotate together with the rotor 5. Due to the constantly changing distance between the guide grooves 2 and the rotor 5, the blades 3 rotate around the rotor 5 at a certain angle, causing a change in the volume of the chambers 4 between adjacent blades, thereby achieving the pumping of liquid from the inlet 7 to the outlet 6. The presence of the guide grooves 2 allows for non-contact movement between the rotor 5, blades 3, and the housing 8. The blades 3 can be made of rigid or flexible materials, still achieving fluid transport. There is no longer relative sliding between the blades 3 and the housing 8 due to the need for sealing, resulting in less wear on the blades 3.

[0040] The eccentricity e between guide groove 2 and rotor 5 is designed based on a trade-off between actual flow requirements, operating speed, maximum operating pressure, and other factors. Preliminary calculations should begin using the displacement formula:

[0041] V=4*π*R*e*b (1)

[0042] In the above formula, V is the displacement (usually measured in milliliters per revolution, ml / rev, or liters per revolution, L / rev); π is pi; e is the eccentricity between the rotor and stator; R is the rotor radius; and b is the blade width. Once the pump is manufactured, R and b become constants. At this point, the displacement V is only proportional to the eccentricity e, and the value of the eccentricity e can be determined based on the displacement requirement.

[0043] When the pump inlet and outlet are not in the same direction, the arrangement should conform to the pressure distribution. The eccentric arrangement is towards the pump inlet side (i.e., the center of rotor 5 is on the pump inlet side). In short, the eccentric direction should be towards the inlet side, and the rotor rotation direction should meet the following requirements: when liquid oil is drawn in at the inlet, the working volume needs to increase from small to large to generate a partial vacuum; when liquid oil is discharged at the outlet, the working volume needs to decrease from large to small to squeeze the liquid oil out.

[0044] The more blades 3 there are, the smaller the flow pulsation will be, but the friction loss and processing complexity will increase. It needs to be considered in conjunction with rotor size, blade width and eccentricity e to achieve the best flow balance.

[0045] Example 2

[0046] like Figures 10 to 11This embodiment provides another rotary vane pump with guide grooves. The outer side of the vane 3 is guided by the rolling of balls 11 at the upper and lower ends of the connecting column 1 into the guide grooves 2. The balls 11 roll within the guide grooves 2 to guide the rotation of the vane 3. Bearings can also be used instead of balls 11 to achieve a rolling connection between the upper and lower ends of the outer side of the vane 3. Unlike Embodiment 1, which uses guide grooves 2 at the upper and lower ends of the connecting column 11, this embodiment uses balls 11 or sliding bearings with spherical outer surfaces, resulting in less wear between the ball 11 and the guide groove 2.

[0047] The above embodiments are merely preferred embodiments of this utility model, and the protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are within its protection scope. It should be noted that improvements and modifications made by those skilled in the art without departing from the principle of this invention should also be considered within the protection scope of this utility model.

Claims

1. A rotary vane pump with guide grooves, characterized in that: include: The housing (8) has a pump inlet (7) and a pump outlet (6) facing outwards; The rotor (5) is rotatably disposed inside the housing (8), and the center of the rotor (5) is offset toward the pump inlet (7); Multiple blades (3) are evenly distributed along the circumference of the rotor (5), and the inner end of each blade (3) is hinged to the rim of the rotor (5) by a hinge (9); A pair of cover plates (10) cover the upper and lower sides of the housing (8) respectively; The guide grooves (2) are a pair, respectively located on the inner side of the upper and lower cover plates (10). The guide grooves (2) are closed rings and are eccentrically arranged with respect to the rotor (5). A connector is provided at the outer end of each blade (3) and embedded in the guide groove (2) above and below, for guiding the blade (3) to swing around its hinge point when the rotor (5) rotates, so that the volume of the chamber (4) between adjacent blades (3) changes, thereby realizing the delivery of fluid from the pump inlet (7) to the pump outlet (6).

2. The rotary vane pump with guide groove according to claim 1, characterized in that, The connector includes a connecting post (1), the upper and lower ends of which are respectively embedded in the upper and lower guide grooves (2).

3. The rotary vane pump with guide groove according to claim 2, characterized in that, The connecting component includes ball bearings (11) or sliding bearings with outer spherical surfaces disposed on the upper and lower sides of the outer end of the blade (3). The ball bearings (11) or the sliding bearings are embedded in the guide groove (2) and can roll or slide along it.

4. The rotary vane pump with guide groove according to any one of claims 1 to 3, characterized in that, The guide groove (2) is a circular closed-loop structure.

5. The rotary vane pump with guide groove according to any one of claims 1 to 3, characterized in that, The blade (3) has a rectangular sheet structure.

6. The rotary vane pump with guide groove according to any one of claims 1 to 3, characterized in that, The blade (3) is made of rigid or flexible material.

7. The rotary vane pump with guide groove according to any one of claims 1 to 3, characterized in that, The rim of the rotor (5) is provided with a plurality of grooves for accommodating the inner end hinge structure of the blade (3).

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