Vane pump capable of working stably

Abstract

The utility model discloses a vane pump capable of working stably, which comprises a casing and a pump core, the pump core comprises an oil distribution disc, a stator and a rotor, and an oil discharge groove communicated with the inside of the pump core and an oil outlet is arranged on the end face of the oil distribution disc opposite to the stator. The inner side of the oil discharge groove is provided with a flow guide mechanism for guiding oil to the root of the blade groove on the rotor to push the blade to extend out; the flow guide mechanism comprises an annular groove and a connecting channel, the annular groove is communicated with roots of all blade grooves in the rotor, and the connecting channel is communicated with the annular groove and the oil discharge groove; the oil discharge groove comprises an inner arc-shaped groove and an outer circular groove which are communicated with each other; the inner arc-shaped groove communicates with the interior of the pump core, and the outer circular groove communicates with the oil outlet. The diameter of the outer circular groove is smaller than the outer diameter of the inner arc-shaped groove; the device can enable the blades to be in stable contact with the inner ring surface of the stator to realize stable work of the vane pump.

Description

Technical Field

[0001] The utility model relates to a vane pump, in particular to a vane pump that can work stably Background Art

[0002] A vane pump is a pump in which the vanes in the rotor slots contact the inner ring of the stator, forcing the sucked-in liquid from the oil inlet side to the oil outlet side. The working process of a vane pump is that as the rotor rotates, the ends of the vanes, under the action of centrifugal force and pressurized oil, cling to the inner surface of the stator ring. Two adjacent vanes, together with the rotor and stator inner surfaces, form a working volume. This volume increases as oil is sucked in, and decreases as oil is discharged. However, when the centrifugal force is insufficient, the ends of the vanes cannot effectively maintain contact with the inner surface of the stator ring, resulting in unstable oil suction and discharge operations. Existing vane pumps lack a corresponding structure to ensure stable contact between the vanes and the inner surface of the stator ring. Summary of the Invention

[0003] Purpose of the utility model: The purpose of the utility model is to provide a vane pump that can make the blades in stable contact with the surface of the stator inner ring and can work stably.

[0004] Technical solution: The utility model describes a vane pump that can work stably, including a housing and a pump core. The pump core includes an oil distribution plate, a stator and a rotor. The end surface of the oil distribution plate opposite to the stator is provided with an oil discharge groove connecting the interior of the pump core with the oil outlet. The inner side of the oil discharge groove is provided with a diversion mechanism for diverting the oil therein to the root of the blade groove on the rotor to push the blades out.

[0005] Based on the above technical solution, an oil drain groove is provided on the end face of the oil distribution plate instead of the axial oil drain through hole commonly used in existing vane pumps, and a guide mechanism is provided on the inside, so that the high-pressure oil discharged from the pump core will first impact the oil distribution plate, be obstructed and then diverted to the inner and outer sides of the oil drain groove, ensuring that there is enough high-pressure oil to flow to the inside through the guide mechanism to push the blades out so that they maintain contact with the inner ring surface of the stator. If an axial through hole is used, the high-pressure oil in the pump core will preferentially be discharged directly to the oil outlet from the unobstructed through hole, and it cannot be ensured that there is enough oil to push the blades out through the guide mechanism. Therefore, the structure of the oil drain groove and the guide mechanism of this vane pump can ensure that the blades are in stable contact with the inner ring surface of the stator, thereby achieving stable operation of the vane pump.

[0006] Preferably, the flow guiding mechanism includes an annular groove communicating with the roots of all blade grooves on the rotor, and the annular groove is communicated with the oil drain groove.

[0007] Preferably, the annular groove is connected to the oil drain groove through a single connecting channel.

[0008] The annular groove and the oil drain groove are connected by a single connecting channel instead of multiple connecting channels in order to reduce the total volume of the annular groove and the oil drain groove. Because the oil drain groove, the connecting channel and the annular groove are interconnected to form a whole, if the overall volume is too large and the amount of oil sucked in is insufficient, effective oil drainage may not be achieved.

[0009] Preferably, the oil discharge groove includes an inner arc groove and an outer circular groove which are connected to each other; the inner arc groove is connected to the inside of the pump core, and the outer circular groove is connected to the oil outlet; the diameter of the outer circular groove is smaller than the outer diameter of the inner arc groove.

[0010] The oil drainage groove is configured as an inner arc groove and an outer circular groove that are interconnected. The diameter of the outer circular groove is smaller than the outer diameter of the inner arc groove. In this way, all the oil discharged in the inner arc groove can only be discharged to the oil outlet from the relatively narrow outer circular groove. The oil is not easily discharged directly at the outer circular groove, further ensuring that sufficient oil flows into the guide mechanism to push the blades.

[0011] Preferably, the stator is provided with a groove matching the oil outlet, and the oil drain groove is located inside the edge of the oil distribution plate.

[0012] The stator is provided with a groove that matches the oil outlet, so that the oil discharge groove can be set on the inner side of the edge of the oil distribution plate to connect the interior of the pump core and the oil outlet. In this way, when the oil in the oil discharge groove is discharged, it will radially impact the outer edge of the oil distribution plate and be blocked, which can further ensure that there is enough oil to flow into the guide mechanism to push the blades; if the stator is not provided with a corresponding groove, in order to connect the interior of the pump core and the oil outlet, the outer side of the oil discharge groove must be directly connected to the edge of the oil distribution plate, so that the oil can be discharged directly from the outer edge of the oil discharge groove without being blocked. The oil will be discharged from the outer edge first, and it cannot be ensured that there is enough oil to enter the guide mechanism.

[0013] Preferably, the oil distribution plate is provided with an oil suction groove whose volume is larger than the oil discharge groove, and the oil suction groove is connected to the interior of the pump core and the oil inlet.

[0014] The volume of the oil suction groove is larger than that of the oil discharge groove, so that the oil suction groove can store more oil, which can ensure that the vane pump can continuously and stably absorb sufficient oil even at high speed.

[0015] Preferably, there are two oil distribution plates, which are detachably connected to both sides of the stator.

[0016] Setting up two oil distribution plates can provide more oil suction and discharge channels for the pump core. Connecting the oil distribution plates and the stator together can also connect the pump core into a whole, which is convenient for disassembly and assembly in the housing.

[0017] Beneficial effect: Compared with the prior art, the beneficial effect of the present invention is that by arranging an oil drain groove on the oil distribution plate and arranging a guide mechanism, the discharged high-pressure oil can be used to push the blades of the rotor to extend, ensuring that the ends of the blades can fit with the inner ring surface of the stator, thereby realizing stable operation of the vane pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a side sectional view of the vane pump;

[0019] Figure 2 This is a front view of the oil distribution plate;

[0020] Figure 3 It is an axial cross-sectional view of the oil distribution plate;

[0021] Figure 4 This is a front perspective view of the pump core. DETAILED DESCRIPTION

[0022] As shown in the figure, Figure 2 The mounting holes for the oil distribution plate are shown in the figure. Figure 4 In order to show the main structure more clearly, the mounting holes on the oil distribution plate and stator are omitted.

[0023] The utility model describes a vane pump capable of stable operation, comprising a housing 1 and a pump core 2, the pump core 2 comprising an oil distribution plate 3, a stator 4 and a rotor 5, an oil discharge groove 6 communicating with the interior of the pump core 2 and the oil outlet is provided on the end surface of the oil distribution plate 3 opposite to the stator 4, and a guide mechanism is provided inside the oil discharge groove 6 for guiding the oil therein to the root of the vane groove 7 on the rotor 5 to push the vanes out.

[0024] The housing 1 is provided with a mounting cavity matching the pump core 2 , and radial sides of the housing 1 are respectively provided with an oil inlet and an oil outlet.

[0025] The pump core 2 includes an oil distribution plate 3, a stator 4 and a rotor 5. The end face of the oil distribution plate 3 abuts against the stator 4. Two oil distribution plates 3 can be provided, which are bolted to the two axial sides of the stator 4 and form a relatively closed space with the stator 4, and the rotor 5 is located in the space; or only one oil distribution plate 3 can be provided, and the other side of the stator 4 abuts against the housing 1 to form a relatively closed space. In addition to bolting, the oil distribution plate 3 can also adopt other detachable connection methods; a plurality of blade grooves 7 are provided on the circumference of the rotor 5, and blades are slidably connected in the blade grooves 7. The vane pump also includes a rotating shaft, which passes through the housing 1 and the pump core 2 and is connected to the drive device. The rotor 5 can be connected to the rotating shaft by means of splines or the like and rotates with the rotating shaft; when the rotor 5 rotates, the blades will extend out of the blade grooves 7 under the action of centrifugal force and contact the inner ring surface of the stator 4; two adjacent blades and the outer ring surface of the rotor 5 and the inner ring surface of the stator 4 form a closed oil storage space, the area where the oil storage space gradually increases is the oil suction area, and the area where the oil storage space gradually decreases is the oil discharge area.

[0026] The oil distribution disc 3 is provided with an oil discharge groove 6 on the end face opposite to the stator 4, which communicates with the inside of the pump core 2 and the oil outlet. The oil discharge groove 6 includes an inner arc-shaped groove and an outer circular groove, which are communicated with each other. The inner arc-shaped groove is communicated with the oil discharge area, and the outer circular groove is communicated with the oil outlet. The diameter of the outer circular groove is smaller than the outer diameter of the inner arc-shaped groove. For details, please refer to Figure 2 All the oil to be discharged in the inner arc-shaped groove is discharged from the outer circular groove.

[0027] The stator 4 is provided with a groove matched with the oil outlet and the oil inlet. Since the oil distribution disc 3 is coaxially arranged with the stator 4 and has the same diameter, the stator 4 is provided with a corresponding groove, so that the oil discharge groove 6 can be located inside the edge of the oil distribution disc 3. In this way, when the oil is discharged from the outer circular groove to the oil outlet, it will also be blocked in the radial direction by the edge of the oil distribution disc 3.

[0028] The inner side of the oil discharge groove 6, that is, the inner side of the inner arc-shaped groove is provided with a flow guide device. The flow guide device includes an annular groove 8 and a connecting channel 9. The root of all the blade grooves 7 on the rotor 5 is provided with an axial through hole communicated with the annular groove 8. The connecting channel 9 can adopt a combination of radial channels and axial channels to communicate the annular groove 8 and the inner arc-shaped groove, that is, the oil discharge groove 6. In this way, the oil in the oil discharge groove 6 can enter the annular groove 8 through the connecting channel 9, and then enter the root of the blade groove 7. Since all the oil in the oil discharge groove 6 is high-pressure oil to be discharged, it can effectively push the blades in the blade groove 7 to stretch outwards to keep effective contact with the inner ring surface of the stator 4, thereby realizing stable operation of the vane pump. The connecting channel 9 can be provided with multiple or only one.

[0029] When the rotational speed of the rotor 5 is insufficient, although it can realize oil suction and discharge, the blades cannot always keep in contact with the inner ring surface of the stator 4 due to insufficient rotational speed, so the oil suction area and the oil discharge area cannot be stably formed, and the vane pump cannot work stably. The structure of the present vane pump can effectively solve this problem.

[0030] The end face of the oil distribution disc 3 opposite to the stator 4 can also be provided with an oil suction groove 10 communicated with the inside of the pump core 2 and the oil inlet. The volume of the oil suction groove 10 is greater than that of the oil discharge groove 6. Specifically, the oil suction groove 10 can adopt the same structure as the oil discharge groove 6, but the groove depth is greater than that of the oil discharge groove 6, or some blind holes are arranged to increase the volume of the oil suction groove 10. In addition to the oil suction groove 10, the oil distribution disc 3 can also be directly provided with an axial oil suction through hole communicated with the inside of the pump core 2 and the oil inlet, which is a common structure of the oil distribution disc in the prior art.

Claims

1. A vane pump capable of stable operation, comprising a housing (1) and a pump core (2), wherein the pump core (2) comprises an oil distribution plate (3), a stator (4) and a rotor (5), and is characterized in that: An oil discharge groove (6) communicating with the interior of the pump core (2) and the oil outlet is provided on the end surface of the oil distribution plate (3) opposite to the stator (4), and a guide mechanism is provided inside the oil discharge groove (6) for guiding the oil therein to the root of the blade groove (7) on the rotor (5) to push the blades out.

2. A stably working vane pump according to claim 1, characterized in that: The flow guide mechanism comprises an annular groove (8) and a connecting channel (9), wherein the annular groove (8) is connected to the roots of all blade grooves (7) on the rotor (5), and the connecting channel (9) is connected to the annular groove (8) and the oil discharge groove (6).

3. A stably working vane pump according to claim 2, characterized in that: The annular groove (8) is connected to the oil drain groove (6) via a single connecting channel (9).

4. The stably working vane pump according to claim 1, characterized in that: The oil discharge groove (6) comprises an inner arc groove and an outer circular groove which are connected to each other; the inner arc groove is connected to the interior of the pump core (2), and the outer circular groove is connected to the oil outlet; the diameter of the outer circular groove is smaller than the outer diameter of the inner arc groove.

5. The stably working vane pump according to claim 1, characterized in that: The stator (4) is provided with a groove matching the oil outlet, and the oil discharge groove (6) is located inside the edge of the oil distribution plate (3).

6. The stably working vane pump according to claim 1, characterized in that: The oil distribution plate (3) is provided with an oil suction groove (10) having a volume larger than the oil discharge groove (6), and the oil suction groove (10) is connected to the interior of the pump core (2) and the oil inlet.

7. The stably working vane pump according to claim 1, characterized in that: There are two oil distribution plates (3), which are detachably connected to both sides of the stator (4).

Images