CN1096570A

CN1096570A - Arc point engaged gear pump

Info

Publication number: CN1096570A
Application number: CN 93107157
Authority: CN
Inventors: 赵明
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-06-14
Filing date: 1993-06-14
Publication date: 1994-12-21

Abstract

Gear pump of the present invention is an arc point engaged gear pump, has the involute gear pair that is arranged on outside the pump housing, is used for transferring power; Be arranged on the circular arc gear pair within the pump housing, be used for conveyance fluid, the coaxial gear of going up dissimilar tooth form, its pitch cylinder is measure-alike.The circular arc gear pair, along the rotation of pump housing figure of eight inwall, propelling fluid advances.Because of circle-arc tooth has or not the advantage of undercut, as far as possible increasing modulus, reduce the number of teeth, can increase the flow of pump.A tooth in the gear pair is made with the elastic material that excellent performance is new; Another is a steel, reaches in the engagement and tempers toughness with gentleness, and makes flank of tooth contacting point good airproof performance.

Description

Arc point engaged gear pump

The present invention relates to a kind of arc point engaged gear pump

In the known hydraulic system, the involute gear pump is widely used, but leakage of oil is many, and wearing and tearing are violent, and flow is little, is used in the simple hydraulic system more; Plunger pump, vane pump advantage are many, but get high pressure and big flow, but complex structure costs an arm and a leg, in water system, and the multistage centrifugal high-pressure service pump, though can obtain high pressure, big flow, volumetric efficiency is low.

The objective of the invention is: provide a kind of flow big, pressure height, volumetric efficiency height, arc point engaged gear pump simple in structure, and use in pump for new material and to create conditions.

Circular arc gear has another name called Ke husband of Novi gear, and China works out JB929-67 flute profile standard.Make gear pump with it, can give full play to following five advantages: 1, contact strength of tooth surface height, bearing capacity are 2.5 to 5 times of involute gear, very help making high-pressure gear pump; 2, concavo-convex bidentate working portion radius of arc is very approaching, and contact (area) pattern is actually the bulk area, is far longer than the contact zones area of involute gear, and the system pump can reduce between cog and leak, and improves volumetric efficiency; 3, do not have Undercutting Phenomenon, And is unrestricted Shang the minimum teeth number Zai Li Lun, reduces number of teeth increasing modulus when making gear pump, and beam strength of tooth is improved, and more important is the volume that increases interdental spaces, improves the flow of pump, can make high-capacity pump; 4, engagement loss mainly is the rolling friction loss, the antiscuffing capacity height, and this is very beneficial for making the high gear pump, and the volume that makes pump is little and ability to work is big; 5, compare with involute gear, this gear can save steel nearly half, have the conclusion of " its economic implications be difficult to really estimate ", therefore being used for making gear pump can save raw material, obviously lower than the cost of existing all kinds of pumps.

One of design arc point engaged gear pump structure example is as accompanying drawing 1, by the pump housing 1, arc point engaging tooth 2, recessed tooth 3, end cap 4, bearing 5, axle 6, involute gear pay 7, shaft coupling 8 forms.Wherein involute gear pays 7, is located at outside the pump housing 1, is used for making two axles 6 do rotation relatively by the power of shaft coupling 8 transmission from motor.Circular arc gear pays 2.Be located within the pump housing, be used for conveyance fluid.Fluid is by in the lower-side hole inspiration pump housing, and with gear teeth high speed rotating, sealed volume reduces, and pressure rises, and is extruded by upper-side hole.All have the gear of two kinds of dissimilar tooth forms to work on the every axle 6, though profile of tooth is different, the pitch cylinder size is all identical together, could rotate with the parallel installation of another root axle like this.

The quantity of double wedge 2 shown in the accompanying drawing 1 seldom can adopt the new material (strengthening PTFE as carbon fiber) of excellent performance to make, and dress is inserted in the pitch cylinder, can exchange after the wearing and tearing, can reduce the cost of pump during batch process greatly.Recessed tooth 3 is to make with rubber-like new material (as FPM26 type fluorine rubber), make concavo-convex gear in engagement process, also have resiliently deformable in a small amount, the two-wheeled pitch cylinder Shi Yiyou resiliently deformable in a small amount of colliding, pump inside is leaked for a short time when conveyance fluid like this, and volumetric efficiency and working pressure will be high.These new materials are anticorrosion and heat resistance is fine, and friction factor and thermal expansion coefficient are low, and the also noise free that runs up helps making corrosion-resistant, low sound level pump.

Design example two as accompanying drawing 2, with one of example difference be: 1, two axles 6 are to dispose up and down, and one of example be about configuration, its benefit is the inlet tube flange, the connection of suitable high-pressure service pump and the requirement of installation; 2, the tooth top center of circular arc gear has narrow groove, and diaphragm seal 10 is slidingly matched in the groove, this sheet under high speed is because action of centrifugal force, can be close to the interior wall slip of housing 1, play the radial seal effect, dexterously the advantage of vane pump is transplanted in the gear pump; 3, in the described narrow groove, also can fix "

" shape diaphragm seal 9, to improve the sealability between pump inwall, end cap and the gear face.

When above-mentioned two kinds of diaphragm seal synergy, the flexible distortion of new gear material noted earlier in addition, with give full play to described five advantages of circular arc gear, can make pump obtain high volumetric efficiency, big working pressure, big flow, corrosion-resistant, low noise, pump performance can tend to reach perfection, and the new product of upgrading is provided for hydraulic system and water system.

Claims

1, a kind of arc point engaged gear pump have that the pump housing, circular arc gear are paid, involute gear is paid, end cap, bearing, axle, centrifugal seal sheet, " ㄇ " shape diaphragm seal, feature of the present invention is: involute gear is paid, not outside the pump housing, transmit motor power; Circular arc gear is paid, not in pump housing figure of eight inner chamber, and conveyance fluid; Centrifugally put in the narrow groove of tooth top portion of circular arc gear from mounting and " ㄇ " shape diaphragm seal.

2, according to right 1, the double wedge in the circular arc gear, directly machine shaping, also available another kind of new material is made, and bag is inserted in the pitch cylinder, shown in the accompanying drawing 12.

3, the tooth top according to right 1 described circular arc gear has narrow groove, slides to join the centrifugal seal sheet, shown in the accompanying drawing 2 10.

4, according in the right 3 described narrow grooves, can fix "

" the shape diaphragm seal, shown in the accompanying drawing 29.

5, according to right 1, a gear during circular arc gear is paid has elasticity.