CN2538979Y

CN2538979Y - Improved gear pump

Info

Publication number: CN2538979Y
Application number: CN 02224643
Authority: CN
Inventors: 朱林森
Original assignee: National Center For Yangling Efficient Irrigation Engineering And Technology Research
Current assignee: National Center For Yangling Efficient Irrigation Engineering And Technology Research
Priority date: 2002-03-22
Filing date: 2002-03-22
Publication date: 2003-03-05
Anticipated expiration: 2012-03-22

Abstract

The utility model relates to an improved wheel pump, which is characterized in that an active lining plate and a fixed lining plate are arranged on the two sides of a meshing gear; a pushing board which can move axially is arranged on the outside of the active lining plate; an adjustment bolt which is arranged on the front end cover pushes the active lining plate forwards via the pushing board, thereby, the gap caused by abrasion can be compensated, the leakage is greatly decreased, the work efficiency and the useful time of the pump are both raised. An overflow tank is arranged on the lining plates on the two sides and is opposite to the gear lag oil zone, and the head of the overflow tank is rounded, and the overflow tank is communicated with a high-handed exhaust chamber of the wheel pump along the middle waist of an 8-shaped lining plate. The spring which is used for oil seal of double-port rubber in the shaft hole is an annular sheet steel with an arc bottom and a plurality of pores, so the sealing performance can be improved. The pump fits to be used for water saving irrigation in agriculture, and has a large flow and a high pump lift. The effect is better when the pump is used in mountain area. The pump can be driven by a motor, a diesel engine, a tractor or a farm truck, and has a strong adaptability.

Description

A kind of improved gear pump

Technical field

The utility model relates to liquid pump, particularly a kind of improved gear pump.

Background technique

Gear pump is mainly used in liquid mediums such as pump oil, water.The gear pump of conventional construction is made up of a pair of pitch wheel, the pump housing and forward and backward end cap etc.Gear is loaded in the pump housing by axle, and bearing is contained in respectively in the end cap of both sides.Usually the modulus of gear pump middle gear is 2～8, wherein sees at most with modulus 5.After the present gear pump assembling, the gear face gap is directly decided by gear thickness and pump housing thickness tolerance, makes very difficult.Very easily wear and tear between actual motion middle gear and sidewall, the wearing and tearing post gap becomes big, causes to leak between the height nip and scurries oil, finally influences flow and efficient.Gear pump is because the controlling mechanism that floats after wearing clearance surpasses certain value, just must be changed component or scrap, thereby maintenance load is big at present, and the life-span of pump is short.Gear pump causes cavitation erosion and noise excessive because gear structure can form the pocketed oil district between engaging tooth.Usually mill compensating groove on pump housing end face, high pressure oil is through the compensating groove oil sucting cavity that refluxes for this reason.The tradition compensating groove is because oil circuit is long, and unreasonable structure causes the off-load difficulty, and oil return is not smooth.The rubber seal of existing in addition gear pump shaft envelope usefulness is because steel wire elasticity is little, and is little to the pressure of sealing position rubber, easily leaks.Gear pump generally is used for oils liquid.As be used for agriculture pumping irrigation and need overcome unfavorable factors such as corrosion, silt particle, little, the unlubricated property of viscosity, thereby be new challenge to gear pump.

Summary of the invention

The purpose of this utility model is the above-mentioned difficulties that will overcome prior art, provides a kind of gear both sides axial clearance adjustable gear pump, and improves the unloading way and the axle envelope mode in engaging gear pocketed oil district on this basis.

Solution of the present utility model comprises the pump housing, front and rear cover and pair of engaged gears and gear shaft thereof etc., it is characterized in that: in engaging gear one side end face fixedly liner plate is set, and can be in the setting of opposite side end face along the movable liner plate of gear axial float; Fixing and movable liner plate all has axis hole, is attached at the engaging gear both sides respectively; Be provided with axially displaceable push pedal in the movable liner plate outside; On front cover, be provided with the adjusting bolt that promotion push pedal and movable liner plate move forward.

Have bypass channel with corresponding position, engaging gear pocketed oil district on above-mentioned fixedly liner plate and the movable liner plate, this bypass channel communicates with gear pump high pressure exhaust chamber along the 8 font liner plate middle parts of the side.

The shape of the relative part with the pocketed oil district of above-mentioned bypass channel head can be circular, and this circular diameter is 1.3～1.5 times of engaging gear tooth root distance; Two gear line of centers zone of high pressure one side, 2～5mm are partial in its center of circle.

The width of the straight channel of above-mentioned bypass channel can be 4～6mm.

In order to improve the sealing of gear pump, the twoport rubber oil sea is housed in the axis hole of said fixing liner plate and movable liner plate, the spring of this oil sealing is that a bottom is the ring-type steel disc of arc, in ring-type steel disc upper punch many apertures that reduce rigidity is arranged; Bore edges has the wiredrawn edge of locating usefulness with rubber oil sea in the ring-type steel disc.

Said fixing and movable liner plate can exceed a pump housing part at thickness direction and use as the end cap location.

The utility model has the advantages that:

1. the wearing clearance on the gear pump end face can be compensated immediately by adjusting bolt, remains the state of fitting tightly, thereby can reduce greatly to leak, and improves the working efficiency and the working life of pump.

2. selected rational compensating groove for use in engaging gear pocketed oil district, the high pressure oil in pocketed oil district enters oil-discharging cavity by the side bypass channel, has improved the force-bearing situation of mechanism, and noise is reduced greatly.

3. owing to adopted better elasticity ring plate shape spring, improved the sealability of axle envelope.

Description of drawings

Fig. 1 is improved gear pump overall structure schematic representation.

Fig. 2 is the structural representation of liner plate and bypass channel.

Fig. 3 is the structural representation of ring piece shape spring.

Fig. 4 is the A-A sectional view of Fig. 3.

Fig. 5 is the user mode schematic representation of ring piece shape spring.

Embodiment

Referring to accompanying drawing, this gear pump comprises the pump housing 1, front cover 10, rear end cover 8 and a pair of intermeshed gear 3,9.Gear is loaded in the pump housing by gear shaft 15,7.Bearing 4 is contained in respectively in the end cap of both sides.The characteristics of this gear pump are that movable liner plate 16 and fixing liner plate 2 are set respectively in the gear both sides.The shape of two side plates is 8 fonts, adapts with the shape of pair of engaged gears, sees Fig. 2.Liner plate can be divided into two-part, also can make an integral body with the line cutting.Separated into two parts is processed easily, and two circular plates mill 8 fonts that can be combined into behind the arcuate section among the figure.Two axis holes 6 are arranged on every side plate, corresponding with two gear shafts.Thereby liner plate 16,2 can be attached at the engaging gear both sides.The movable liner plate 16 of this gear pump can move axially along gear, for floating type.Fixedly liner plate can not move after installing.In movable liner plate 16 outsides push pedal 14 similar with its shape is housed, push pedal is a single piece, props up movable liner plate.Push pedal 14 also can be moved along gear shaft.The adjustment bolt 13 that is located on the front cover is passed movable liner plate 16 forward by push pedal 14, thus the gap of can compensate for wear causing.This type gear pump can be adjusted when wearing and tearing take place in the gear side immediately owing to adopted relocation mechanism.During operation, unclamp lock nut 12 earlier, bolt 13 is adjusted in turn slightly then, watches pump upward pressure list index to rotate simultaneously.When pointing to the groove of the original proper functioning of pump, get final product.At last with nut 12 lockings.Pump along with wearing and tearing constantly take place, can repeatedly be adjusted in running, makes the gear side remain suitable gap.Like this, not only help keeping the degree of vacuum of pump, and can avoid often changing component, help prolonging the working life of pump.

Gear pump is owing to be provided with two side plates, and the off-load problem that helps the pocketed oil district is better solved.Cause two side plates and gear face are in the state of fitting tightly.Oil in the inboard groove of liner plate can obtain sealing.Can offer bypass channel 5 in the two side plates one side relative with gear for this reason.Bypass channel divides two-part, and the circular trough 18 of head is located at pocketed oil district, two gear engagement positions, and its area should be able to contain this pocketed oil district fully.The inventor determines that with measuring and calculating the diameter of circular trough 18 is that 1.3～1.5 times of engaging gear tooth root distance are comparatively suitable after deliberation.Its center of circle O is partial to two gear line of centers zone of high pressure one side, 2～5mm.Module hour is selected lower limit, chooses limit when module is big.With modulus commonly used is that 5 gear pump is an example, the about 16mm of the diameter of circular trough, and it is 3mm that the line of centers distance is departed from its center of circle.The straight channel 19 of bypass channel is along the joint close symmetric arrangement of the 8 font liner plate middle parts of the side that is two blocks of liner plates.Promptly on two blocks of liner plates, respectively open half groove, be merged into a whole groove, pass to the zone of high pressure of the non-hydraulic fluid port of gear pump.The width of straight channel 19 is 8～16mm, the about 3mm of groove depth.This structure can guarantee that the high pressure oil in pocketed oil district is in time dredged, and oil return circuit is short.

Two side plates also have an effect, can be used as the benchmark of the pump housing 1 and 10,8 radial locations of forward and backward end cap exactly.Two side plates 2,16 are loaded in the pump housing 1, and the part that liner plate thickness exceeds the pump housing gives over to end cap location usefulness, can make the pump housing, pump cover easy to assembly, the Location accuracy height.

In order to prevent liquid along the gear pump shaft sealing leakage, this type pump has been done improvement to the self-tightening spring of used rubber oil sea.Traditional J-shaped or U-shaped rubber oil sea are to be made of J-shaped or U-shaped rubber oil sea body and ring-type self-tightening helical spring.Because little, the underpressure of present used spring tension causes sealing effect to be affected.It is the ring-type steel disc 20 of arc that this oil sealing changes traditional garter spring into bottom, as shown in Figure 3.The bottom of this ring is an arc, thereby can bending deflection, and dashes many apertures 21 are arranged, and has reduced rigidity, is more conducive to distortion.There is location wiredrawn edge 22 inside edge of ring.Only need to go into interior the getting final product of groove of twoport oil sealing 11 during use as Fig. 4 concora crush.

Compared with prior art, this type gear pump is owing to adopted movable liner plate compensating axial wearing clearance in time, thereby leakage rate is little between the height nip, and the degree of vacuum height is good from absorption.No matter the high rotating speed or the slow-speed of revolution all can reliably realize self-priming.Have plurality of advantages such as compact structure, easy for installation, durable in use, lift height.This pump is suitable for use as agricultural water-saving irrigation.When module was 5, a pump can be joined 15～25 shower nozzles, can irrigate 10～15 mu of crops simultaneously.The flow of pump can reach 45～50m ³/ h, lift 70～85m.Use in the mountain area, more can the display performance advantage.Available motor, diesel engine, tractor or agricultural vehicle drive, and rotating speed is at 1450～2900rpm, and adaptability is strong.

Claims

1, a kind of improved gear pump, comprise the pump housing (1), front and rear cover (10,8) and pair of engaged gears (3,9) and gear shaft (15,7) thereof, it is characterized in that: in engaging gear (3, a 9) side end face fixedly liner plate (2) is set, can be in the setting of opposite side end face along the movable liner plate (16) of gear axial float; Fixing and movable liner plate all has axis hole (6), is attached at engaging gear (3,9) both sides respectively; Be provided with axially displaceable push pedal (14) in movable liner plate (16) outside; On front cover (10), be provided with the adjusting bolt (13) that promotion push pedal (14) and movable liner plate (16) move forward.

2, gear pump as claimed in claim 1 is characterized in that going up and corresponding position, engaging gear pocketed oil district has bypass channel (5) at fixedly liner plate (2) and movable liner plate (16), and this bypass channel communicates with gear pump high pressure exhaust chamber along the 8 font liner plate middle parts of the side.

3, gear pump as claimed in claim 1 or 2, the shape that it is characterized in that the relative part with the pocketed oil district of bypass channel (5) head is circular, this circular diameter is 1.3～1.5 times of engaging gear tooth root distance; Two gear line of centers zone of high pressure one side, 2～5mm are partial in its center of circle.

4, gear pump as claimed in claim 3 is characterized in that the width of the straight channel (19) of said bypass channel (5) is 4～6mm.

5, gear pump as claimed in claim 1 or 2, it is characterized in that in the axis hole of said fixedly liner plate (2) and movable liner plate (16) twoport rubber oil sea (4) being housed, the spring of this oil sealing is that a bottom is the ring-type steel disc (20) of arc, in ring-type steel disc upper punch many apertures (21) that reduce rigidity is arranged; Bore edges has the wiredrawn edge (22) of locating usefulness with rubber oil sea in the ring-type steel disc.

6, gear pump as claimed in claim 1 or 2 is characterized in that the said fixing movable liner plate (2,16) that reaches exceeds the pump housing (a 1) part at thickness direction.