Subsidiary vane for a vane pump

Abstract

A kind of for vane pump sub-mother blade, it includes the stator in vane pump, the rotatable rotor is equipped in the stator, the outer surface of the rotor is equipped with multiple blade slots, the mother blade that can slide in and out of blade slot is equipped in the blade slot, the side of the mother blade towards the root of blade slot is equipped with sub-leaf slot, the sub-leaf slot is equipped with the sub-leaf blade that can slide in and out of sub-leaf slot, the width of the sub-leaf blade is 1 / 6 to 1 / 13 of the width of mother blade.The width of sub-leaf blade is reduced by reducing the width ratio between sub-leaf and mother blade, so that the friction between mother blade and inner wall of stator is reduced, energy is saved, noise is reduced, flow is increased, oil temperature is reduced, overheating is prevented, and the service life of vane pump is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydraulic pump, more particularly, the present application relates to a kind of for vane pump sub-mother vane. BACKGROUND

[0002] Vane pump is compact in structure, and has the characteristics of large flow, high pressure, small pulsation, high efficiency and low noise during operation, which makes vane pump widely used in machine tool, plastic machine, leather machinery, forging and pressing machinery, engineering machinery and other fields. With the development of the times and the continuous expansion of the application field, under the use requirement of high speed and high pressure, the service life of vane is difficult to meet the requirement due to too fast wear. Therefore, sub-mother vane pump emerges as the times require. The sub-vane groove is opened on one side of the mother vane towards the vane groove root, the sub-vane is arranged in the sub-vane groove, the rotor and the side plate are provided with oil passage, so that the pressure at the top and the bottom of the mother vane is the same. In this way, the force of the mother vane pressing towards the stator is equal to the force of the high-pressure oil acting on the end surface area of the sub-vane. According to the design specification of the sub-mother vane pump, the width of the sub-vane is generally 1 / 3 to 1 / 5 of the width of the mother vane. Therefore, by adopting the sub-mother vane form, the force of the vane pressing towards the stator can be reduced to 1 / 3 to 1 / 5 of the original, thereby at least prolonging the service life of the vane by 3 to 5 times. In the past ten years or so, with the rapid development of injection molding machine industry, heavy machinery industry and military industry, higher requirements have been put forward for the speed and pressure of vane pump.

[0003] To overcome this problem, the State Intellectual Property Office published a patent No. CN102094816A on June 15, 2011, entitled “Sub-mother vane pump”. The sub-mother vane pump disclosed in the patent comprises a pump body, a cavity in the pump body, a rotor in the cavity, a vane groove on the rotor, a mother vane in the vane groove, a sub-vane groove on the mother vane, a sub-vane in the sub-vane groove, a high-pressure cavity formed by one end of the sub-vane and the sub-vane groove, a low-pressure cavity formed by the other end of the sub-vane and the vane groove, a chamfer formed by removing the material along the length direction of the side surface of the sub-vane and the mother vane, a pressure relief channel formed by the chamfer, the side wall of the sub-vane groove and the side wall of the vane groove, one end of the pressure relief channel being communicated with the high-pressure cavity, and the other end of the pressure relief channel being communicated with the low-pressure cavity. The sub-mother vane pump disclosed in the patent reduces noise, saves electric energy and prolongs service life. However, the patent increases processing procedures and sets four pressure relief channels, thereby greatly increasing the manufacturing cost of the vane pump. SUMMARY

[0004] To overcome the above-mentioned defects, the technical problem to be solved by the present application is to provide a sub-mother vane pump which can greatly reduce the interaction force between the mother vane and the stator under the premise of not increasing processing procedures and manufacturing cost, thereby reducing friction, saving electric energy, preventing overheating, reducing noise and prolonging service life.

[0005] The technical scheme of the present application solves the problems in the prior art: a primary-secondary vane for a vane pump, which comprises a stator in the vane pump, a rotatable rotor is arranged in the stator, the outer surface of the rotor is provided with a plurality of vane grooves, a secondary vane is arranged in each vane groove and can slide in and out of the vane groove, the secondary vane is provided with a primary vane groove on the side facing the root of the vane groove, and a primary vane is arranged in the primary vane groove and can slide in and out of the primary vane groove, the width of the primary vane is 1 / 6 to 1 / 13 of the width of the secondary vane.

[0006] Since the birth of the primary-secondary vane pump, the width of the primary vane is 1 / 3 to 1 / 5 of the width of the secondary vane has become a design specification, and after being introduced into China, people regard it as a golden rule, so when improving the interaction force between the secondary vane and the stator, no one has ever considered improving it from the perspective of the width of the primary vane, and the comparative documents in the background art are all improved from other angles, and the comparative documents in the background art are formed by removing the material on the two sides of the primary vane and the secondary vane along the length direction to form four chamfers, the chamfers and the side walls of the primary vane groove and the vane groove form pressure relief channels, and the pressure difference between the top and the bottom of the vane is improved through the four pressure relief channels, so as to achieve the purpose of reducing friction, saving electric energy, reducing noise and prolonging service life.

[0007] The inventor of the present application realized the reason and principle of why the primary vane is arranged on the secondary vane when studying the primary-secondary vane, and obtained inspiration after that, and decided to break the golden rule that the width of the primary vane is 1 / 3 to 1 / 5 of the width of the secondary vane, and solve the problem from the perspective of the width of the primary vane. Therefore, the width of the primary vane in the technical scheme of the present application is 1 / 6 to 1 / 13 of the width of the secondary vane. According to the principle of the primary vane: “the force of the secondary vane pressing towards the stator is equal to the force of the high-pressure oil acting on the area of the end surface of the primary vane”, the thickness of the primary vane is unchanged, so the area of the end surface of the primary vane is proportional to the width of the primary vane, the width of the primary vane in the technical scheme of the present application is smaller than that of the prior art, therefore, the force of the secondary vane pressing towards the stator in the present application is smaller than that in the prior art, that is, the friction force acting on the secondary vane in the present application is smaller, so the power required to drive the rotor to rotate is relatively small, which saves electric energy and reduces noise; the wear between the secondary vane and the inner cavity wall of the stator is less, which can prolong the service life of the secondary vane and the stator; further, the heat generated by friction is less, which can prevent the primary-secondary vane pump from overheating; and the reduction of the width of the primary vane does not increase the processing procedure and the manufacturing cost; due to the small width of the primary vane, the amount of leakage through the channel is also small, which can increase the flow. The technical effects of the technical scheme of the present application are verified by comparison test, and the experimental results are recorded in Table A in the examples.

[0008] As a further technical solution, the width of the sub-leaf blade is 1 / 7 to 1 / 12 of the width of the mother leaf blade.

[0009] As a further technical solution, the width of the sub-leaf blade is 1 / 8 to 1 / 11 of the width of the mother leaf blade.

[0010] As a further technical solution, the width of the sub-leaf blade is 1 / 9 to 1 / 11 of the width of the mother leaf blade.

[0011] As a further technical solution, the width of the sub-leaf blade is 1 / 10 of the width of the mother leaf blade.

[0012] The present application reduces the width of the sub-leaf blade by reducing the width ratio between the sub-leaf blade and the mother leaf blade, thereby reducing the friction between the mother leaf blade and the inner wall of the stator, saving electric energy, reducing noise, increasing flow, reducing oil temperature, preventing overheating, and prolonging the service life of the leaf blade pump. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural sectional view of a sub-mother leaf blade pump;

[0014] Figure 2 is a structural schematic view of the prior art of the present application;

[0015] Figure 3 is a structural schematic view of the present application.

[0016] In the figure: stator 1, mother leaf blade 2, sub-leaf blade 3, rotor 4. DETAILED DESCRIPTION

[0017] The present application will be further described below through specific examples and in conjunction with the drawings.

[0018] Example: a sub-mother leaf blade for a leaf blade pump, as shown in Figure 1 , which comprises a stator in a leaf blade pump, a rotatable rotor is arranged in the stator, the outer surface of the rotor is provided with a plurality of leaf blade grooves, a mother leaf blade which can slide in and out of the leaf blade groove is arranged in the leaf blade groove, the side of the mother leaf blade facing the root of the leaf blade groove is provided with a sub-leaf groove, and a sub-leaf blade which can slide in and out of the sub-leaf groove is arranged in the sub-leaf groove, as shown in Figure 3 , the width of the sub-leaf blade is 1 / 10 of the width of the mother leaf blade.

[0019] Test verification: the pump core model of prior art sub-mother blade pump is 35V-3A, the width of the mother blade is 40.162mm, the thickness is 3.114mm, and the height is 18.100mm; the width of the sub-blade is 8.42mm (marked as sub-width 8mm), the thickness is 3.114mm, and the height is 10.13mm; the pump core model of the patent is also 35V-3A, the width of the mother blade is 40.162mm, the thickness is 3.114mm, and the height is 18.100mm; the width of the sub-blade is 4mm (marked as sub-width 4mm), the thickness is 3.114mm, and the height is 10.13mm. According to the test method of hydraulic vane pump issued by the Ministry of Mechanical Industry, JB-T 7040-1993, the comparative test is carried out on the same test table, and the test results are recorded as shown in the following table A.

[0020] Table A

[0021]

[0022] From the test data, it can be seen that the technical scheme of the present application achieves beneficial effects and is effectively verified.

[0023] The above-described embodiments are only a preferred scheme of the present application, and do not limit the present application in any form, and other variants and modifications can be made without exceeding the technical scheme recorded in the claims.

[0024] The contents not described in detail in the specification belong to the prior art known to the professional technical personnel.

Claims

1. A sub-primary vane for a vane pump, comprising a stator in a vane pump, a rotatable rotor provided in the stator, an outer surface of the rotor provided with a plurality of vane grooves, a primary vane provided in each of the vane grooves so as to be slidable in and out of the vane groove, the primary vane provided on a side thereof toward a root of the vane groove with a sub-vane groove, and a sub-vane provided in the sub-vane groove so as to be slidable in and out of the sub-vane groove, characterized in that, the sub-vane groove is provided with a plurality of sub-vane grooves, and the sub-vane is provided in each of the sub-vane grooves so as to be slidable in and out of the sub-vane groove. The width of the sub-leaf is 1 / 6 to 1 / 13 of the width of the parent leaf.

2. The sub-multiple vane for a vane pump according to claim 1, characterized in that, The width of the sub-leaf is 1 / 7 to 1 / 12 of the width of the parent leaf.

3. The sub-multiple vane for a vane pump according to claim 2, characterized in that, The width of the sub-leaf is 1 / 8 to 1 / 11 of the width of the parent leaf.

4. The sub-multiple vane for a vane pump according to claim 2, characterized in that, The width of the sub-leaf is 1 / 9 to 1 / 11 of the width of the parent leaf.

5. The sub-multiple vane for a vane pump according to claim 2, characterized in that, The width of the sub-leaf is 1 / 10 of the width of the parent leaf.

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