CN86200564U

CN86200564U - Radial radiation seven-piston-pump used in universal testing machine

Info

Publication number: CN86200564U
Application number: CN 86200564
Authority: CN
Inventors: 陈干
Original assignee: SHANGHAI TESTING MACHINE FACTORY
Current assignee: SHANGHAI TESTING MACHINE FACTORY
Priority date: 1986-02-26
Filing date: 1986-02-26
Publication date: 1987-02-11

Abstract

The utility model provides a radial radiation seven-piston-pump used in universal testing machine. The existing radial radiation six-piston-pump has small noises, whose structure is suitable for a universal testing machine, flow pulsation of the oil pump is unsteady, and flow non-uniform factor amounts to 13.9%. The utility model keeps the feature of small noises on the base of the original structure and adopts a radiation seven-piston-pump comprising seven pistons and piston sleeves. The centre lines of the seven pistons are not through the crankshaft rotation center. As a result, the oil-out flow pulsation of the oil pump is decreased and the flow non-uniform factor is reduced to 2.53%. The other feature is that a spiral sealing structure is adopted on the belt pulley so as to prevent the leakage of the oil from spattering.

Description

Radial radiation seven-piston-pump used in universal testing machine

The utility model is applied on the universal testing machine, belongs to the liquid pump technical field.

The utility model is improved according to the 582nd page of radial radiation six plungers circle of volume (Science Press's version in 1980) in " power value and hardness measurement handbook " pump.

Existing six plungers circle pump, plunger is radiation to be arranged, compact structure, flow is little, the pressure height, noise is low.Compare with other quantitative radial plunger side pump or quantitative axial piston pump, be applicable to the requirement of universal testing machine.But this circle pump is the same with other oil pumps on being used for testing machine, exists the unsettled phenomenon of fuel-displaced flow pulsation, and the factor of non-uniform flow of this circle pump is 13.9% as calculated.Fuel-displaced flow pulsation is excessive, the steady load in the time of influencing the testing machine dynamometry.

The purpose of this utility model is the little radiating type plunger circle pump of fuel-displaced flow pulsation of design on the basis that keeps former round pump advantage.

The method that solves the utility model task is not form the radial radiation seven-piston-pump by the plunger and the plunger bushing at crankshaft rotating center with seven center lines.Through oil pump flow pulsation computational analysis, newly the factor of non-uniform flow of round pump is reduced to 2.53%, thereby fuel-displaced flow pulsation is reduced.

Utilize the embodiment shown in the accompanying drawing, the utility model is described further.

Fig. 1: the main sectional view of the utility model circle pump.

Fig. 2: the II among Fig. 1-II sectional drawing.

The new round pump that designs according to the crank connecting rod sliding block principle has been described in Fig. 1 and Fig. 2.

Seven pairs of radially plunger of radiation (2) and plunger bushings (6) are outwards arranged from the pump housing (1) center.The center line of each plunger does not just in time pass through the rotating center of bent axle (4), parallel the radial ray of And by bent axle (4) rotating center with radial ray by bent axle (4) rotating center be that sense of rotation is regarded tossing about of start bit as but five equilibrium is arranged on, its side-play amount is about half of crankshaft journal throw of eccentric, can make the suffered moment of plunger (2) reduce to minimum like this, thereby reduce the friction between plunger (2) and the plunger (6), increase the service life.

When bent axle (4) rotates, lean on the thrust of plunger stage clip (10) to make plunger (2) always to the inner close fitting eccentric journal.Bent axle (4) seven plungers (2) that whenever circle make a round trip, and all have a plunger (2) to be pulled to outermost position every (360 °)/7.It is the oil suction stroke that plunger (2) moves inward, and outwards motion is the oil extraction stroke.When the oil suction stroke, plunger bushing (6) cavity volume increases, and pressure is lower than barometric pressure oil sucting valve (11) and enters in plunger bushing (6) chamber from the fuel tank oil suction.When pressing oily stroke, plunger is advanced and has just been sealed the oil suction valve port about 2mm voluntarily, the oil of plunger bushing (6) inner chamber is compressed, pressure raises, when going out oil pressure and surpassing the oil pressure on outlet valve top and fuel-displaced check valve spring (8) pressure, the steel ball (9) that pressure oil is just pushed fuel-displaced one-way valve open enters high-pressure system.Along with the rotation of bent axle (4), seven plungers (2) of circle pump are also oil suction and oil extraction constantly in turn like this.

Because the eccentric journal of plunger (2) head and bent axle (4) has friction, frictional force improves with oil pressure in the pump and increases, so adorn a single-row radial ball bearing (5) in crankshaft eccentric axle journal outside frictional force is reduced.In order to make oil pump not fuel-displaced, fuel-displaced inhomogeneous or reduce oil pump capacity, the air in outer-hexagonal exhaust bolt (7) excavationg pump of can back-outing because of the existence of air.The connection motor connects cover (12) and connection motor joint chair (13) can directly be connected in the circle pump on the motor.

When between plunger (2) and plunger (6) during to-and-fro motion, leak oil and can lubricate three bearings on the bent axle (4).But too much leakage oil is understood excessive and is radially splashed.Therefore, go up screw thread opposite of design, when bent axle (4) rotates, play the thread seal effect, force the oily orientation of leakage to be released, thereby prevented to leak radially splashing of oil with the crankshaft rotating direction at the belt pulley (3) that drives bent axle (4).

The utility model has the advantages that and reduced the oil pump flow pulsation. The oil pump flow pulsation is excessive, and the steady load in the time of can affecting the testing machine dynamometry should not be less than 30 seconds by standard force-measuring pointer duration of load during the universal testing machine examination. Its another advantage is to have prevented that with a simple structure leakage oil from radially splashing, thereby has kept the clean and tidy of testing machine workplace.

Claims

1, the radially width of cloth that is used on the universal testing machine is penetrated seven-piston-pump, have one therefrom the outer width of cloth of mind-set penetrate the circular pump housing (1) of plunger, thrust by plunger stage clip (10) makes plunger (2) be close to ecto-entad motion on the rotating eccentricity axle journal, make plunger bushing (6) cavity volume Zeng Jia And open the existing oil suction of oil sucting valve (11) cause for gossip voluntarily, eccentric journal makes plunger (2) do motion from inside to outside to the thrust of plunger (2) during by bent axle (4) rotation, when plunger (2) has sealed oil sucting valve (11) mouth voluntarily, the oil of plunger bushing (6) inner chamber is compressed, pressure is increased to the steel ball (9) of pushing one-way valve open and enters high-pressure system, rotation along with bent axle (4), seven plungers (2) of circle pump are also oil suction and oil extraction constantly in turn like this, feature of the present utility model is: the plunger center line five equilibrium of seven plungers (2) is arranged on and parallels And with width of cloth ray by bent axle (4) rotating center is that sense of rotation is regarded tossing about of start bit as with the width of cloth ray by bent axle (4) rotating center, and its side-play amount is about half of crankshaft journal throw of eccentric.

2, round pump as claimed in claim 1 is characterized in that: on belt pulley (3), have one with the opposite worm structure of bent axle (4) sense of rotation.