Title

Vane pump and vanes thereof

Technical Field

The present application relates to a vane pump and vanes thereof, and in particular to a vane pump and vanes thereof for reducing the influence of friction between the vanes and an inner peripheral surface of a stator.

Background Art

A vane pump is a pump widely used in the industrial field. In general, the vane pump comprises a stator having an empty space, and a rotor eccentric from the stator is provided in the empty space. A plurality of vane grooves extending in a radial direction of the rotor are provided in the rotor, and vanes are provided in the vane grooves. The vanes can radially reciprocate in the vane grooves along the vane grooves. A cover plate and a base plate are provided on an upper side and a lower side of the stator and the rotor and seal the above-mentioned empty space. Upper end faces of the vanes come into contact with and are sealed to the cover plate, and lower end faces of the vanes come into contact with and are sealed to the base plate. By means of the reciprocating motion of the vanes in the vane grooves, the top of the vanes can be pressurized with a fluid sealed in the empty space.

With the above-mentioned method, a basic pressurized function of the vane pump can be achieved, however, the vanes reciprocate in the vane grooves and rotate with the rotor; front end faces of the vanes, under the action of a

centrifugal force, come into contact with and are sealed to an inner peripheral face of the stator; and with a high-speed rotational linear speed between the stator and the rotor, relatively large frictions are provided between front ends of the vanes and the inner peripheral face of the stator.

It is necessary to provide a novel vane pump and vanes thereof to solve the problem of large friction between the front end faces of the vanes and the inner peripheral face of the stator.

Summary of the Invention

The object of the present application is to provide a vane pump and vanes thereof for reducing the friction between the vanes and an inner peripheral surface of a stator.

The present application provides a vane pump, comprising a stator having an accommodation groove, a rotor provided in the accommodation groove, a plurality of vane grooves radially formed in the rotor, and a plurality of vanes able to reciprocally slide in the vane grooves, each of the vanes being provided with a front end face and an opposite rear end face, and the front end face being able to come into contact with and be sealed to an inner surface of the

accommodation groove, wherein the vane is provided with a through hole running from a rear end face to a front end face, and a hollowed-out portion provided in the vane.

Preferably, a plurality of hollowed-out portions are provided, and the hollowed-out portion is a side groove running from the front end face to the rear end face. The vane pump further comprises a cover plate provided over the accommodation groove, and a base plate provided under the accommodation groove, wherein the vane comes into contact with and is sealed to the cover plate via an upper end face and comes into contact with and is sealed to the base plate via a lower end face, and the side groove is provided in the upper end face and/or the lower end face. The vane is made of an aluminium alloy or a magnesium alloy or a titanium alloy.

The present application furthermore provides a vane for a vane pump, wherein the vane is provided with a through hole running from a rear end face to a front end face, and a hollowed-out portion provided in the vane.

The present application further provides a vane pump, comprising a stator having an accommodation groove, a rotor provided in the accommodation groove, a plurality of vane grooves radially formed in the rotor, and a plurality of vanes able to reciprocally slide in the vane grooves, each of the vanes being provided with a front end face and an opposite rear end face, and the front end face being able to come into contact with and be sealed to an inner surface of the accommodation groove, wherein an upper end face and/or a lower end face of the vane is provided with a side groove running from the front end face to the rear end face.

The vane of the present application uses the hollowed-out portion, and can also use a material with a relatively low mass; therefore, the self weight of the vane is reduced, and in the case of the same rotational angular speed of the rotor, the friction between the rotor and the inner peripheral face of the stator is relatively small.

Brief Description of the Drawings

Exemplary embodiments of the present application will be described hereinafter in detail with reference to the accompanying drawings, and it should be understood that the embodiments described below are merely for explaining the present application and do not limit the scope of the present application, in which:

Fig. 1 is a perspective exploded view of a vane pump in the prior art, for illustrating the basic structure of the vane pump.

Fig. 2 is a perspective structural view of a vane in the vane pump in the prior art.

Fig. 3 is a perspective exploded view of a vane pump in an embodiment of the present application, for illustrating the basic structure of the vane pump.

Fig. 4 is a perspective structural view of a vane in an embodiment of the present application.

Fig. 5 is a section view of a vane in a vane pump in an embodiment of the present application, for displaying the condition of the vane in contact with an inner peripheral surface of a stator in a vane groove.

Detailed Description of Embodiments

In various drawings, the same reference numerals denote the same or similar parts.

It should be understood that the drawings are merely used to illustrate this application, and the dimension, proportion and number of parts in the drawings are not to be construed as limiting the present application.

Please refer to Fig. 1 , which is a perspective exploded view of a vane pump 900 in the prior art. The vane pump 900 comprises a stator 1 , the stator 1 is provided with an accommodation groove 1 1 , the accommodation groove 1 1 is cylindrical, a cover plate 5 is provided on an upper side of the stator 1, and a base plate 4 is provided on a lower side of the stator 1. The cover plate 5, the stator 1 and the base plate 4 mentioned above can be fixedly combined, so that the accommodation groove 1 1 is partially enclosed. A rotor 2 disposed eccentrically from the stator 1 is provided in the accommodation groove 1 1. A plurality of vane grooves 21 are radially formed in the rotor 2, and a vane 92 is provided in each of the vane grooves 21. The vane 92 can reciprocate in the vane groove 21.

Please refer to Fig. 2, which is a perspective view of the vane 92 in the prior art. The vane 92 is provided with a front end face 921 close to an inner surface of the stator 1, and a rear end face 922 opposite the front end face 921. An end face of the vane 92 close to the cover plate 5 is provided with an upper end face 923, and an end face close to the base plate 4 is provided with a lower end face 924.

The front end face 921 can be sealed to an inner peripheral surface of the stator 1, the upper end face 923 can be sealed to the cover plate 5, and the lower end face 924 can also be sealed to the base plate 4.

Since the vane 92, when rotating in the rotor 2 and under the action of a thrust of an elastic member at a rear end of the vane 92 and a centrifugal force, slides along the vane groove 21 to an outer side, the front end face 921 of the vane 92 abuts against the inner peripheral surface of the stator 1, and a relatively large friction may occur if the self weight of the vane 92 is relatively heavy.

Please refer to Fig. 3, which shows a vane pump 100. The vane pump comprises a stator 1 , the stator 1 is provided with an accommodation groove 1 1 , the accommodation groove 1 1 is cylindrical, a cover plate 5 is provided on an upper side of the stator 1 , and a base plate 4 is provided on a lower side of the stator 1. The cover plate 5, the stator 1 and the base plate 4 mentioned above can be fixedly combined, so that the accommodation groove 1 1 is partially enclosed. A rotor 2 disposed eccentrically from the stator 1 is provided in the

accommodation groove 1 1. A plurality of vane grooves 21 are radially formed in the rotor 2, and a vane 22 is provided in each of the vane grooves 21. The vane 22 can reciprocate in the vane groove 21.

Please refer to Fig. 4, the vane 22 is provided with a front end face 221 close to an inner surface of the stator 1 , and a rear end face 222 opposite the front end face 221. An end face of the vane 22 close to the cover plate 5 is provided with an upper end face 223, and an end face close to the base plate 4 is provided with a lower end face 224. The front end face 221 can be sealed to an inner peripheral surface of the stator 1, the upper end face 223 can be sealed to the cover plate 5, and the lower end face 224 can also be sealed to the base plate 4.

Please combine and refer to Fig. 5, which is a structural view of the vane 22 provided in the vane pump 100. The vane 22 is provided with a through hole 228 running from the front end face 221 to the rear end face 222, the part of the through hole 228 close to the rear end face 222 can accommodate the elastic member, and the elastic member in this embodiment is a spring 6. The spring 6 can apply a force from an inner side to an outer side of the vane groove 21 on the vane 22, so that under the combined action of the centrifugal force of the vane 22, the front end face 221 of the vane 22 always abuts against the inner peripheral surface of the stator 1. A plurality of hollowed-out portions 229 can be provided in the vane 22, in this application, the purpose of arranging the hollowed-out portions 229 is to reduce the self weight of the vane 22, and certainly a lightweight alloy material can also be used to manufacture a vane to reduce the self weight of the vane 22. The lightweight alloy material can be an aluminium alloy, a magnesium alloy, a titanium alloy, etc.

Please continue to refer to Fig. 4, in this embodiment, the hollowed-out portions 229 are side grooves provided in the upper end face 223 and the lower end face 224 of the vane 22 and both run from the rear end face 222 to the front end face 221. The side grooves can be provided in the upper and lower end faces, or can be provided in either one. Of course, in other embodiments, the hollowed- out portions 229 can be other parts formed on the vane 22, including a

honeycomb-like hollowed-out portion, etc.

Since in this embodiment, the vane 22 uses the arrangement of the hollowed-out portions 229, the vane uses a lightweight alloy, the self weight of the vane 22 is reduced, thus reducing the influence of the centrifugal force, when the rotor 2 rotates, with respect to the friction between the front end face 221 of the vane 22 and the inner peripheral surface of the stator 1. By means of the regulation of an elastic force of the spring, frictions can be reduced under the premise of ensuring sealing.

The present application is described above with reference to the most practical preferred embodiments currently considered. It should be understood that the above description is not a limitation of this application. This application is also not limited to the above examples. Any changes, modifications, additions or substitutions made by those of ordinary skill in the art within the essential scope of the present application should also fall within the protection scope of the present application.