Vane pump with new vanes

Abstract

The application discloses a vane pump with new vanes, which comprises a pump body, a rotor arranged in the pump body, a stator with a near-elliptical inner cavity arranged on the rotor, vanes arranged on the rotor in a circumferential direction and capable of moving radially along the rotor, the top end of the vane abutting against the inner cavity wall of the stator, side plates arranged on the two sides of the stator respectively, side grooves arranged on the two sides of the vane towards the side plates respectively, a plug body arranged in the side groove, the plug body matched with the side groove, balance holes penetrating the vane arranged on the vane at positions close to the two side grooves, and lubricating holes arranged on the plug body and communicated with the balance holes. The balance holes and the lubricating holes are arranged on the vane, so that the side groove can be cancelled, the area for blocking the leakage of the oil cavity with higher pressure to the oil cavity with lower pressure is greatly increased, the invalid energy consumption of the pump body is reduced, and the energy-saving efficiency can be further improved.

Description

Technical Field

[0001] The present invention relates to a hydraulic pump, in particular to a vane pump with new vanes. Technical Background

[0002] The basic structure of the vane pump is as follows: a transmission shaft is provided in the pump body, a rotor is fixedly sleeved on the transmission shaft, a stator is provided outside the rotor, and a plurality of blade slots are evenly distributed circumferentially on the outer circumference of the rotor, generally 12 blade slots, and blades that can move along the radial direction of the rotor are provided in the blade slots, and the top of the blade can abut against the inner surface of the stator. Side plates are provided on both sides of the rotor, and the inner surface of the stator is composed of a large arc surface, a variable curvature arc surface, and a small arc surface to form a nearly elliptical inner cavity wall.

[0003] In order to balance the pressure between the top and root ends of the blades in the prior art vane pumps and ensure that the abutment force of the blades against the inner wall of the stator is appropriate, so as to slow down the wear of the blades and extend the service life of the blades, side grooves are respectively provided on the two sides of the blades facing the side plates, such as the invention patent with announcement number CN110131162A announced by the Patent Office of China on August 16, 2019. This invention patent discloses an energy-saving vane pump, including a pump body, a transmission shaft is provided in the pump body, a rotor is sleeved on the transmission shaft, a stator is provided outside the rotor, a blade groove is provided on the rotor, and blades are evenly distributed between the rotor and the stator. The root end of the blade is located in the blade groove, and the top end of the blade faces the stator. Side plates are respectively provided on both sides of the rotor, and a high-pressure cavity and an oil outlet cavity are respectively provided on the side plates. A connecting passage is provided on the side plate between the cavity and the oil outlet cavity, and the rotor, stator, blades and side plates form an oil chamber. The oil chamber includes an oil pressure chamber whose volume changes from large to small as the rotor rotates and an oil suction chamber whose volume changes from small to large as the rotor rotates. A U-shaped top groove is provided at the top of the blade, and the blade top groove, stator and side plate form a top pressure chamber. The top pressure chamber can be connected with the oil pressure chamber and the oil suction chamber. The root end of the blade, the blade groove and the side plate form a root pressure chamber. The root pressure chamber is connected with the high-pressure chamber, and the oil outlet chamber is connected with the oil pressure chamber. The side plate is provided with a partition structure in the connecting passage between the high-pressure chamber and the oil outlet chamber, which blocks the connection between the high-pressure chamber and the oil outlet chamber. A through hole is provided in the blade, and the two ends of the through hole are respectively connected to the top pressure chamber and the root pressure chamber. Side grooves are respectively provided on the two sides of the blade facing the side plate, and the side grooves are respectively connected with the top pressure chamber and the root pressure chamber.

[0004] The technical solution of this invention patent has effectively solved the energy-saving problem of the vane pump during the pressure maintaining stage. Due to the presence of side grooves on both sides of the vane, the energy-saving efficiency of the vane pump can be further improved by reducing the internal leakage of the vane pump. Summary of the Invention

[0005] In order to overcome the above-mentioned defects, the technical problem to be solved by the present invention is: to provide a vane pump with new blades that further improves energy-saving efficiency by reducing internal leakage.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a vane pump with new blades, which includes a pump body, a rotor is provided in the pump body, a stator with a nearly elliptical inner cavity is provided outside the rotor, blades that can move radially along the rotor are evenly distributed on the circumference of the rotor, the top of the blades abuts against the inner cavity wall of the stator, side plates are provided on both sides of the stator, side grooves are provided on both sides of the blades facing the side plates, plugs are provided in the side grooves, the plugs are matched with the side grooves, the blades are provided with balancing holes passing through the blades at positions close to the two side grooves, and the plugs are provided with lubrication holes connected to the balancing holes.

[0007] The side grooves on both sides of the blade have two positive effects. One is to balance the pressure between the tip and the root of the blade, so as to reduce the wear of the blade tip and extend the service life of the blade. The other is to lubricate the friction between the blade and the side plate, which is also intended to reduce the wear of the blade side and extend the service life of the blade. In addition, there is a negative effect, which reduces the area between the side surfaces of the blade and the side plate used to block the leakage of the higher pressure oil cavity to the lower pressure oil cavity, resulting in an increase in the internal leakage of the pump body, thereby increasing the ineffective energy consumption of the pump body. Since the sum of the two positive effects is greater than the negative effect, the blade side grooves have long existed in the existing technology, restricting the further improvement of the energy-saving efficiency of the vane pump. Exploring a technical solution that can maintain its two positive effects and eliminate its negative effects has become a long-term goal pursued by industry insiders. The inventors have now proposed a technical solution that cleverly solves this problem. The technical solution is first to set a balancing hole at the position of the blade close to the side groove to replace the side groove's function of balancing the pressure between the top and root ends of the blade, and then set a lubrication hole on the side of the blade to guide the oil in the balancing hole to the side surfaces on both sides of the blade to replace the side groove's function of lubricating the friction between the blade and the side plate. In this way, the side groove in the prior art can be naturally eliminated, thereby greatly increasing the area used to prevent the leakage of the higher-pressure oil chamber to the lower-pressure oil chamber, reducing the ineffective energy consumption of the pump body, and further improving the energy-saving efficiency.

[0008] Preferably, the plugging body is integrated with the blade. Eliminating the processing of the side grooves on both sides of the blade is equivalent to integrating the plugging body with the blade. Since arc grooves are difficult to process, while round holes are easier to process, eliminating the side grooves can reduce the manufacturing cost of the blade.

[0009] Preferably, the number of the lubrication holes is two. The side of the blade is long and narrow, and two lubrication holes are arranged above and below to facilitate lubrication of both sides of the blade and the side plate.

[0010] Preferably, the axial direction of the balancing hole is the same as the extending direction of the side groove.

[0011] Beneficial effect: Since the balancing holes and lubrication holes are set on the blades, the side grooves can be eliminated, which greatly increases the area used to prevent the leakage of the higher-pressure oil chamber to the lower-pressure oil chamber, reduces the ineffective energy consumption of the pump body, and can further improve energy-saving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the present invention;

[0013] Figure 2 It is a cross-sectional schematic diagram of the assembly of the core components of the present invention;

[0014] Figure 3 is a schematic cross-sectional view of a blade of the present invention;

[0015] Figure 4 It is a structural schematic diagram of the blade of the present invention;

[0016] Figure 5 It is a structural diagram of a blade in the prior art.

[0017] In the figure: pump body 1, stator 2, rotor 3, side plate 4, blade 5, lubrication hole 6, blade groove 7, balance hole 8, side groove 9. Implementation Method

[0018] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0019] Embodiment: A vane pump with new blades, as shown in the figure, includes a pump body 1, a rotor 3 is provided in the pump body 1, and a stator 2 with a nearly elliptical inner cavity is provided on the outer surface of the rotor 3, and twelve blade grooves 7 are evenly distributed on the circumference of the outer surface of the rotor 3. Blades 5 that can move radially along the rotor 3 are provided in the blade grooves 7, and the tops of the blades 5 abut against the inner cavity wall of the stator 2. Side plates 4 are provided on both sides of the stator 2, and blocking bodies are provided in the grooves 9 on both sides of the blades 5 facing the two side plates 4. The blocking bodies are matched with the side grooves 9 and connected as one. The side grooves 9 and the blocking bodies are combined together, which is equivalent to canceling the side grooves 9. The blades 5 are respectively provided with balancing holes 8 passing through the blades 5 at positions close to the two original side grooves 9, and the balancing holes 8 are parallel to the original side grooves 9. The blades 5 are provided with lubrication holes 6 connected to the balancing holes 8 at the position of the original blocking bodies, and two lubrication holes 6 are respectively arranged on the two sides of the blade 5.

[0020] The embodiment described above is only a preferred solution of the present invention and does not limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solution described in the claims.

[0021] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

Claims

1. A vane pump with novel blades, comprising a pump body, a rotor disposed therein, a stator having a nearly elliptical inner cavity disposed therein, blades uniformly distributed circumferentially on the rotor and movable in the radial direction of the rotor, the tips of the blades abutting against the inner cavity wall of the stator, side plates disposed on either side of the stator, and side grooves disposed on either side of the blades facing the side plates, characterized in that: A blocking body is provided in the side groove, and the blocking body matches the side groove. The blade is provided with a balancing hole passing through the blade at a position close to the two side grooves. The blocking body is provided with a lubrication hole connected to the balancing hole, and the axial direction of the balancing hole is the same as the extension direction of the side groove.

2. The vane pump with new vanes according to claim 1, characterized in that: The blocking body is connected to the blades as a whole.

3. The vane pump with new vanes according to claim 2, characterized in that: The number of the lubrication holes is two.

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