CN112303468B

CN112303468B - Vane type oil pump capable of reducing friction work and improving low-speed state volumetric efficiency

Info

Publication number: CN112303468B
Application number: CN202011299099.1A
Authority: CN
Inventors: 杨福柱; 许仲秋; 刘光明; 佘笑梅
Original assignee: Hunan Oil Pump Co Ltd
Current assignee: Hunan Meihu Intelligent Manufacturing Co.,Ltd.
Priority date: 2020-11-19
Filing date: 2020-11-19
Publication date: 2022-01-04
Anticipated expiration: 2040-11-19
Also published as: CN112303468A

Abstract

The utility model provides a reduce friction work and improve blade type oil pump of low-speed state volumetric efficiency, relates to oil pump technical field, and it includes the pump body, pump cover, pump shaft, rotor, stator, spring, two holding rings and a plurality of blade, the bottom of the pump body is equipped with the first high pressure oil groove that feeds through the pump outlet, the bottom surface correspondence of pump cover is equipped with second high pressure oil groove, the up end of rotor is equipped with the step groove, the lower terminal surface is equipped with the lower step groove, the rear end of each blade all stretches into in last step groove and the lower step groove, the bottom of the pump body is equipped with one and is used for introducing the first oil groove that draws in the lower step groove with the fluid in the first high pressure oil groove, the bottom surface of pump cover is equipped with one and is used for introducing the second oil groove that draws in the upper step groove with the fluid in the second high pressure oil groove. The invention can reduce the oil leakage condition of the volume area generated under the low speed state of the oil pump to a great extent by keeping the arc part of the outer end of the blade tightly attached to the inner wall of the stator.

Description

Vane type oil pump capable of reducing friction work and improving low-speed state volumetric efficiency

Technical Field

The invention relates to the technical field of oil pumps, in particular to a vane type oil pump capable of reducing friction work and improving low-speed state volumetric efficiency.

Background

The outer ends of the blades of the conventional blade type oil pump and the inner wall of the stator have a certain movement clearance, and when the oil pump works normally, the blades are thrown outwards under the action of centrifugal force, so that the arc parts at the outer ends of the blades are tightly attached to the inner wall of the stator, and the oil in a volume area formed between the adjacent blades is ensured not to leak to other volume areas basically. However, when the oil pump operates at a low speed, the centrifugal force of the blades is small, and the blades may not be fully thrown out under the influence of the friction force, so that the arc positions at the outer ends of the blades cannot be tightly attached to the inner wall of the stator, and therefore a more obvious oil leakage condition can be formed in the volume area, and further the volume efficiency is reduced.

Disclosure of Invention

The invention aims to provide a vane type oil pump which reduces friction work and improves the volume efficiency in a low-speed state, and the situation of volume region oil leakage generated in the low-speed state of the oil pump is greatly reduced by keeping the arc part at the outer end of a vane tightly attached to the inner wall of a stator.

In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a reduce friction work and improve blade type oil pump of low-speed state volumetric efficiency, includes the pump body, pump cover, pump shaft, rotor, stator, spring, two holding rings and a plurality of blade, the bottom of the pump body is equipped with the first high-pressure oil groove of intercommunication pump export, the bottom surface correspondence of pump cover is equipped with second high-pressure oil groove, the up end of rotor is equipped with the step groove, the lower terminal surface is equipped with the lower step groove, and the rear end of each blade all stretches into in last step groove and the lower step groove, the bottom of the pump body is equipped with one and is arranged in introducing the first oil groove of leading of fluid in the first high-pressure oil groove to the lower step groove, the bottom surface of pump cover is equipped with one and is arranged in introducing the second oil groove of leading of fluid in the second high-pressure oil groove to the step groove, be equipped with the guide bar that inserts in the spring on the inner wall of the pump body.

Preferably, the upper stepped groove and the lower stepped groove are arranged around a shaft hole in the center of the rotor.

More preferably, the bottom surface of the upper stepped groove is annular, and the wall surface of the upper stepped groove extends to the outer edge close to the rotor; the groove bottom surface of the lower step groove is annular, and the groove wall surface of the lower step groove extends to the outer edge close to the rotor.

More preferably, the upper end of the shaft hole of the pump body is provided with a first oil storage hole with the diameter larger than that of the pump shaft; and a second oil storage hole with the diameter larger than that of the pump shaft is formed in the lower end of the shaft hole of the pump cover.

More preferably, the first oil guide groove and the second oil guide groove are both arranged in a bending manner towards the rotation direction of the rotor so as to form an arc-shaped groove body structure.

The invention has the beneficial effects that: the upper and lower end surfaces of the rotor are respectively provided with the upper step groove and the lower step groove, and the oil liquid in the corresponding first high-pressure oil groove and the second high-pressure oil groove is respectively led into the corresponding step grooves through the first oil leading groove and the second oil leading groove, so that the step grooves at the upper and lower ends of the rotor can be filled with the oil liquid and establish certain oil pressure, since the rear ends of the vanes extend into the upper stepped groove and the lower stepped groove, even if the centrifugal force of the vanes is small due to the low-speed operation of the oil pump, the oil hydraulic pressure in each stepped groove can act on the rear ends of the vanes to push against the vanes, and the arc part of the outer end of the blade is tightly attached to the inner wall of the stator, so that the condition of volume area oil leakage generated in the low-speed state of the oil pump is greatly reduced, the friction work of the blade is reduced, and the volume efficiency in the low-speed state is improved.

Drawings

FIG. 1 is a schematic view of an overall structure of an embodiment of the present invention when a pump cover is hidden;

FIG. 2 is a schematic sectional view taken along line A-A in FIG. 1;

FIG. 3 is a schematic diagram of an embodiment with the pump cover, pump shaft, rotor, and positioning ring hidden.

The reference signs are:

1-pump body 2-pump cover 3-pump shaft

4-rotor 5-stator 6-spring

7-vane 8 a-first high-pressure oil groove 8 b-second high-pressure oil groove

9 a-upper step groove 9 b-lower step groove 10 a-first oil drainage groove

10 b-second oil guide groove 11 a-first oil storage hole 11 b-second oil storage hole

12-positioning ring.

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention.

It should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are used broadly in the present invention, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Further, in the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may comprise the first and second features being in direct contact, or may comprise the first and second features being in contact, not in direct contact, but via another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature. The terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the invention.

As shown in fig. 1-3, a vane-type oil pump for reducing friction work and improving volumetric efficiency in a low-speed state includes a pump body 1, a pump cover 2, a pump shaft 3, a rotor 4, a stator 5, a spring 6, two positioning rings 12, and a plurality of vanes 7, a first high-pressure oil groove 8a communicating with the pump outlet is provided at the bottom of the pump body 1, a second high-pressure oil groove 8b is correspondingly provided at the bottom of the pump cover 2, an upper stepped groove 9a is provided at the upper end surface of the rotor 4, a lower stepped groove 9b is provided at the lower end surface, the rear end of each vane 7 extends into the upper stepped groove 9a and the lower stepped groove 9b, a first oil guiding groove 10a for guiding oil in the first high-pressure oil groove 8a into the lower stepped groove 9b is provided at the bottom of the pump body 1, a second oil guiding groove 10b for guiding oil in the second high-pressure oil groove 8b into the upper stepped groove 9a is provided at the bottom of the pump cover 2, the inner wall of the pump body 1 is provided with a guide rod (not shown in the drawings) inserted in the spring 6.

When the vane type oil pump provided by the embodiment reduces the friction work and improves the volumetric efficiency in the low-speed state runs at a high speed, the rotor 4 drives the vanes 7 to rotate, the vanes 7 are thrown outwards under the action of centrifugal force, the arc parts at the outer ends of the vanes are tightly attached to the inner wall of the stator 5, and the oil pump works normally.

Preferably, the upper step groove 9a and the lower step groove 9b are both arranged around the shaft hole in the center of the rotor 4, and the groove bottom surface of the upper step groove 9a is annular and the groove wall surface thereof extends to the outer edge close to the rotor 4, and the groove bottom surface of the lower step groove 9b is annular and the groove wall surface thereof extends to the outer edge close to the rotor 4, so that the oil storage capacity of the upper step groove 9a and the lower step groove 9b cannot be maximized, and the end surface of the rotor 4 can be subjected to more stable and uniform oil pressure, and the oil pressure at the two ends can play a certain supporting role for the rotor 4, reduce the contact area between the end surface of the rotor 4 and the pump body 1 and the pump cover 2, and further reduce the rotation friction force of the rotor 4.

More preferably, the upper end of the shaft hole of the pump body 1 is provided with a first oil storage hole 11a with a diameter larger than that of the pump shaft 3; the lower end of the shaft hole of the pump cover 2 is provided with a second oil storage hole 11b with the diameter larger than that of the pump shaft 3. First oil storage hole 11a is direct intercommunication with lower step groove 9b, and second oil storage hole 11b is direct intercommunication with last step groove 9a, and this makes and can both store certain fluid in first oil storage hole 11a and the second oil storage hole 11b, and the oil pressure that forms in the step groove of rotor 4 both sides can promote these fluid to enter into the shaft hole of the pump body 1 and the shaft hole of pump cover 2 again to play the lubrication action, improve the rotation frictional force that each position shaft hole wearing and tearing and pump shaft 3 received.

In addition, in the present embodiment, as shown in fig. 3, preferably, the first oil guiding groove 10a and the second oil guiding groove 10b are both bent toward the rotation direction of the rotor 4 to form an arc-shaped groove body structure, and since the rotor 4 drives the oil to rotate, the oil itself has a certain inertia force, and then the oil guiding grooves are both arranged in the arc-shaped groove body structure, so that the oil can flow along the direction of the inertia force of the oil itself when the oil enters, and the oil in the high pressure oil groove can enter the corresponding oil guiding groove more smoothly, thereby reducing the pressure fluctuation of the oil to a certain extent.

The above embodiments are preferred implementations of the present invention, and the present invention can be implemented in other ways without departing from the spirit of the present invention.

Some of the drawings and descriptions of the present invention have been simplified to facilitate the understanding of the improvements over the prior art by those skilled in the art, and some other elements have been omitted from this document for the sake of clarity, and it should be appreciated by those skilled in the art that such omitted elements may also constitute the subject matter of the present invention.

Claims

1. The utility model provides a reduce frictional work and improve low-speed state volumetric efficiency's vane type oil pump, includes the pump body (1), pump cover (2), pump shaft (3), rotor (4), stator (5), spring (6), two holding rings (12) and a plurality of blade (7), the bottom of the pump body (1) is equipped with first high-pressure oil groove (8 a) that the intercommunication pump was exported, the bottom surface correspondence of pump cover (2) is equipped with second high-pressure oil groove (8 b), its characterized in that: the improved pump is characterized in that an upper stepped groove (9 a) is formed in the upper end face of the rotor (4), a lower stepped groove (9 b) is formed in the lower end face of the rotor, the rear end of each blade (7) extends into the upper stepped groove (9 a) and the lower stepped groove (9 b), a first oil leading groove (10 a) used for leading oil in a first high-pressure oil groove (8 a) into the lower stepped groove (9 b) is formed in the bottom of the pump body (1), a second oil leading groove (10 b) used for leading oil in a second high-pressure oil groove (8 b) into the upper stepped groove (9 a) is formed in the bottom face of the pump cover (2), and a guide rod inserted into the spring (6) is arranged on the inner wall of the pump body (1).

2. The vane-type oil pump that reduces frictional work and improves low-speed state volumetric efficiency according to claim 1, characterized in that: the upper step groove (9 a) and the lower step groove (9 b) are arranged around the shaft hole in the center of the rotor (4).

3. The vane-type oil pump that reduces frictional work and improves low-speed state volumetric efficiency according to claim 2, characterized in that: the bottom surface of the upper step groove (9 a) is annular, and the wall surface of the upper step groove extends to the outer edge close to the rotor (4); the bottom surface of the lower step groove (9 b) is annular, and the wall surface of the lower step groove extends to the outer edge close to the rotor (4).

4. The vane-type oil pump that reduces frictional work and improves low-speed state volumetric efficiency according to claim 1, characterized in that: a first oil storage hole (11 a) with the diameter larger than that of the pump shaft (3) is formed in the upper end of the shaft hole of the pump body (1); and a second oil storage hole (11 b) with the diameter larger than that of the pump shaft (3) is formed in the lower end of the shaft hole of the pump cover (2).

5. The vane-type oil pump that reduces frictional work and improves low-speed state volumetric efficiency according to claim 1, characterized in that: the first oil guide groove (10 a) and the second oil guide groove (10 b) are both arranged in a bending mode towards the rotating direction of the rotor (4) so that an arc-shaped groove body structure is formed.