CN103991780B - Plunger piston type hydraulic pump with double-output-shaft motor - Google Patents

Abstract

The invention discloses a plunger piston type hydraulic pump with a double-output-shaft motor. The plunger piston type hydraulic pump comprises a left plunger piston and a right plunger piston. The left plunger piston and the right plunger piston are cooperatively arranged in corresponding cavities. The plunger piston type hydraulic pump is characterized in that a machine tool is provided with a power input element and a driving device for driving the power input element to rotate, the two ends of the power input element are respectively provided with a lead screw, the axes of the two lead screws are located on the same straight line, the thread screwing directions of the two lead screws are opposite, and the guiding strokes of the two lead screws are the same; each lead screw is in threaded connection with a nut, and each nut is fixedly provided with a nut hinged support; the left plunger piston and the right plunger piston are symmetrically arranged with the axes of the lead screws as the symmetric axis, the left plunger piston and the right plunger piston are respectively provided with two toggle rods in a hinged mode, and the other ends of the toggle rods are hinged to the nut hinged supports respectively. According to the plunger piston type hydraulic pump, the friction mode of the movement process of the plunger pistons is very simple, the service life of the plunger piston type hydraulic pump can be obviously prolonged, the mechanical efficiency can be improved, and energy saving is facilitated.

Description

Use the pluger type hydraulic pump of Dual-output shaft motor

Technical field

The invention belongs to mechanical field, relate to a kind of plunger hydraulic using Dual-output shaft motor Pump, in particular for the pluger type hydraulic pump of hydraulic elevator drive system.

Background technology

At present, in industrial circle wide variety of Metering Flow Control Circuits Hydraulic Adjustable Speed technology, mainly The Metering Flow Control Circuits being made up of dosing pump and choke valve and the pump speed governing driven by variable pump System two kinds.Powerful, flow is mainly inclined disc type axle with the continuously adjustable hydraulic pump of pressure To plunger displacement pump, but the structure of cam-type axial piston pump is extremely complex, and particularly plunger to hold By the moment formed by radial force, so that its friction condition deteriorates, service life and machine Tool efficiency reduces.Additionally, the piston shoes structure being connected to plunger lower end is complicated, friction condition is extremely Badly, flow system adding complexity etc. so that the manufacturing process of plunger displacement pump is extremely complex. Traditional cam-type axial piston pump also has a critical defect that can not be ignored, i.e. flow unstable Fixed, produce so-called pulsation rate, such as flow pulse rate to be reduced, not only need to increase the individual of plunger Number, and needing the number of plunger is prime number, such as 3,5,7,11,13,17,19, 23 etc..Therefore, excessive amounts of plunger is really a kind of helpless selection, not only causes Mechanism is complicated, and manufacturing cost remains high.

The fluid power system of hydraulic elevator, is a kind of hydraulic pressure system typically needing continuous speed adjustment System, considers from energy-conservation and operating cost, uses servo variable displacement axial plunger pump contrast of regulating speed reason Think, but, price that servo variable displacement axial plunger pump is extremely expensive and fault rate higher because of Element, limits its application at hydraulic elevator.

Authorization Notice No. is that the Chinese patent of CN102207066B also discloses that a kind of symmetrical The double-action plunger pump that toggle link drives, but this double-action plunger pump merely illustrates afterbody machine Tool actuating device, if increasing reducing gear and the driving motor of upper front end, it finds that this pair The integral layout of acting ram pump is the most asymmetric.Additionally, the toggle link in this double-action plunger pump Mechanism is to be hinged on the eccentric pin shaft of gear face, and this bearing pin is cantilever beam, force-bearing situation pole Difference.

Summary of the invention

In order to solve the problems referred to above, the present invention provide a kind of simple in construction, with low cost, can Continuously adjusting flow rate and the pluger type hydraulic pump using Dual-output shaft motor of pressure.

A kind of plunger hydraulic using Dual-output shaft motor of offer is provided Pump, it includes left plunger and right plunger, and described left plunger and right plunger are placed in respective ordinatedly In cavity volume, it is characterised in that: also include a Dual-output shaft motor, described Dual-output shaft motor Output shaft two ends respectively arrange a leading screw, and the thread rotary orientation of leading screw described in two is contrary, helical pitch is identical； The most threaded nut on each described leading screw, each described nut is all fixed a nut hinge Bearing；Described left plunger and right plunger are symmetrical arranged with the axis of described leading screw for axis of symmetry, institute Stating the most hinged two toggle links on left plunger and right plunger, the other end of toggle link described in two is respectively articulated with one Described nut hinged-support.

Preferably, described Dual-output shaft motor is Dual-output shaft motor servomotor or double output shaft Alternating-current variable frequency motor.

Preferably, the end of described cavity volume is equipped with in-line and oil extraction road；Described in-line leads to Crossing check valve to communicate with fuel tank, described oil extraction road is connected with external hydraulic system by check valve.

Preferably, the outlet of the check valve on described oil extraction road communicates with manostat, going out of manostat Mouth leads to hydraulic executing system.

Preferably, described manostat is connected to digital pressure switch.

Preferably, described leading screw is ball-screw, is provided with between described nut and described leading screw Ball, described leading screw is provided with the spiral type raceway rolled for described ball.

The pluger type hydraulic pump using Dual-output shaft motor of the present invention is arranged symmetrically with by driving Guilde screw-elbow-bar mechanism, then promote that two plungers carry out inwardly or outwardly simultaneously is right Claim motion, the output pressure of plunger hydraulic pump can not only be made with flow within a large range Carry out Automated condtrol and regulation, and the topmost element plunger of plunger hydraulic pump, Being not subject to any radial force in theory, therefore, the friction mode of plunger motion process is the simplest Single, can not only significantly extend its service life, and mechanical efficiency can be improved, be conducive to Energy-conservation.

Accompanying drawing explanation

Fig. 1 is the pluger type hydraulic pump most preferred embodiment that the present invention uses Dual-output shaft motor Structural representation during reset state；

Fig. 2 is the pluger type hydraulic pump most preferred embodiment that the present invention uses Dual-output shaft motor Structural representation during duty.

Detailed description of the invention

Below the detailed description of the invention of the present invention is described in further detail.

As shown in accompanying drawing 1, accompanying drawing 2, the plunger type liquid using Dual-output shaft motor of the present invention Press pump includes Dual-output shaft motor 1.The two ends of Dual-output shaft motor 1 have been respectively fixedly connected with rotation direction phase Instead, the identical leading screw of helical pitch 2 and leading screw 2 ', leading screw 2 and leading screw 2 ' are provided with ordinatedly Corresponding nut 9, nut is fixed on nut hinged-support 4 and nut hinged-support 4 '；Nut cuts with scissors Bearing 4 respective symmetry upper with nut hinged-support 4 ' is hinged with two secondary toggle links 5,5 ', 6,6 ', and two Secondary toggle link 6 and the other end of toggle link 6 ', be hingedly connected on left plunger 8 and right plunger 8 ', Left plunger 8 and right plunger 8 ' are placed in respective cavity volume ordinatedly；Left and right two cavity volumes 10, The end of 10 ' (the most left plunger 8 and the cavity volumes of right plunger 8 ' correspondence, lower same) is provided with into oil extraction Road (not shown)；In-line (not shown) is by check valve (not shown) with fuel tank (not Diagram) communicate, oil extraction road (not shown) is by check valve and external hydraulic system (not shown) Connect.The outlet of the check valve (not shown) on oil extraction road communicates with manostat (not shown), Hydraulic executing system (not shown) is led in the outlet of manostat；Digital pressure it is connected on manostat Switch (not shown).Enter oil extraction road, check valve, fuel tank, manostat, digital pressure switch It is known to industry and widely used structure with hydraulic executing system, and non-invention innovative point Place.

From accompanying drawing 1,2, when Dual-output shaft motor 1 rotates, leading screw 2 and silk Thick stick 2 ' rotates with, and leading screw 2 is oppositely oriented with leading screw 2 ', helical pitch is identical, is cooperatively disposed to Therefore leading screw 2 is carried out the most inwards or the most outside with nut 3 ' with the nut 3 on leading screw 2 ' Symmetric motion, thus be fixed on nut 3 and cut with scissors with nut with the nut hinged-support 4 on nut 3 ' Bearing 4 ' also can symmetric motion accordingly.

When nut 3 and nut 3 ' the most outwards symmetric motion, it is hinged on nut hinged-support 4 On the toggle link 6 that with toggle link 5 ' and is hinged on nut hinged-support 4 ' of toggle link 5 and toggle link 6 ' just Can drive left plunger 8 and right plunger 8 ' simultaneously to inner side symmetric motion, at this moment, left and right two The volume enlargement of cavity volume, forms negative pressure, and the hydraulic oil in fuel tank under atmospheric pressure, is beaten Open following check valve, respectively enter in the cavity volume of left plunger 8 and right plunger 8 '.Work as dual output Spindle motor reversely rotates, and nut 3 and nut 3 ' are the most symmetrical under the effect of positive and negative leading screw Motion, left plunger 8 and right plunger 8 ' do symmetric motion under the effect of toggle link simultaneously laterally. At this moment, the smaller volume of the cavity volume of left plunger 8 and right plunger 8 ' correspondence, fluid is formed pressure, Making to lead to below the closed check valve of fuel tank, check valve the most above is opened, it is achieved pressure Oil output.

The plunger displacement pump of the present invention, the calculation of pressure formula of output liquid is:

$p=\frac{{8M}_{\mathrm{\η}}}{{\mathrm{sd}}^2\tan \mathrm{\α}}---\left(1\right)$

Wherein:

M motor output torque；

D diameter of plunger；

α toggle link pressure angle；

η overall mechanical efficiency.

From formula (1), the pressure p that hydraulic pump is exported, lead at torque M, leading screw In the case of journey s and diameter of plunger d are certain, it is dependent on the pressure angle α of toggle link.Pressure Angle is the biggest, then the pressure of hydraulic pump output is the least；Pressure angle is the least, then the pressure of hydraulic pump output Power is the biggest.Therefore, by controlling the size of pressure angle, the output pressure of hydraulic pump can be made to exist Change in very wide range.

The formula for displacement calculation of plunger displacement pump of the present invention is:

$V=\frac{{\mathrm{\πld}}^2({\cos \mathrm{\α}}_1-\cos {\mathrm{\α}}_2)\mathrm{\ηv}}{2}---\left(2\right)$

η_VThe volumetric efficiency of plunger displacement pump.

From formula (2), owing to cos α is in α=0⁰-90⁰Constant interval in, be one non- The function of linear decrease, so α₁With α₂Even if difference is identical, when diverse location, the row of pump Amount is also different.α₁With α₂When bigger interval value, discharge capacity is bigger；Less During interval value, discharge capacity is less.Aggregative formula (1), (2) are it can be seen that by control be System so that α runs in the interval that value is bigger, can obtain low pressure and mass flow pump；Otherwise, α is run in the interval that value is less, high-pressure low-flow pump can be obtained.

Owing to the dynamical element of the present invention is servomotor, and by symmetrical guilde screw-elbow Linkage promotes plunger motion, so, the angular displacement of servomotor is controlled by numerical control programming, Can arbitrarily select the interval at α place, and α completely₁With α₂Difference；And by converter, The rotating speed of alternating-current variable frequency motor can also be controlled, add other electric apparatus control apparatus, thus also Can arbitrarily select the interval at α place, and α₁With α₂Difference.Therefore the plunger of the present invention Pressure that pump is exported and flow, it is possible to be carried out continuously within a large range Digital Control with Regulation, is especially suitable for the occasion needing frequently to adjust pressure and flow, is particularly suited for Hydraulic elevators etc. need high-power, the equipment of continuous speed adjustment.

Owing to the plunger delivery side of pump of the present invention is connected to hydraulic pressure regulator, therefore, it is possible to surely Fixed flow is to hydraulic executing system output pressure liquid.Additionally, be connected on hydraulic pressure regulator Digital pressure switch, can carry out Automated condtrol according to the change of pressure so that institute is defeated The pressure gone out disclosure satisfy that different needs.

Above example is only the present invention a kind of embodiment therein, its describe more concrete and In detail, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.Should be understood that It is, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, Can also make some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, The protection domain of patent of the present invention should be as the criterion with claims.

Claims (3)

1. the pluger type hydraulic pump using Dual-output shaft motor, it includes left plunger and right plunger, described left plunger and right plunger are placed in respective cavity volume ordinatedly, it is characterized in that: also include a Dual-output shaft motor, the output shaft two ends of described Dual-output shaft motor respectively arrange a leading screw, and the thread rotary orientation of leading screw described in two is contrary, helical pitch is identical；The most threaded nut on each described leading screw, each described nut is all fixed a nut hinged-support；Described left plunger and right plunger are symmetrical arranged with the axis of described leading screw for axis of symmetry, and the most hinged two toggle links on described left plunger and right plunger, the other end of toggle link described in two is respectively articulated with nut hinged-support described in；

Described Dual-output shaft motor is Dual-output shaft motor servomotor or double output shaft alternating-current variable frequency motor；

The end of described cavity volume is equipped with in-line and oil extraction road；Described in-line is communicated with fuel tank by check valve, and described oil extraction road is connected with external hydraulic system by check valve；

Described leading screw is ball-screw, is provided with ball between described nut and described leading screw, and described leading screw is provided with the spiral type raceway rolled for described ball.

The pluger type hydraulic pump of employing Dual-output shaft motor the most according to claim 1, it is characterised in that: the outlet of the check valve on described oil extraction road communicates with manostat, and hydraulic executing system is led in the outlet of manostat.

The pluger type hydraulic pump of employing Dual-output shaft motor the most according to claim 2, it is characterised in that: it is connected to digital pressure switch on described manostat.