CN2241788Y

CN2241788Y - Low-noise liquid control system for double cylinder single-purpose pump

Info

Publication number: CN2241788Y
Application number: CN 95219306
Authority: CN
Inventors: 刘晓军
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-08-18
Filing date: 1995-08-18
Publication date: 1996-12-04
Anticipated expiration: 2005-08-18

Abstract

This technique belongs to fluid machinery class. This solution is presented to overcome the insufficiency of large impact vibration in the oil circuit and the only application to low power usage for a single-cylinder bi-functional pump. The solution is composed of an oil pump, a main switching valve and a pilot valve, characterized in that the main switching valve is a three-position four-way valve; an oil circuit for the pilot valve to control the main switching valve is connected in series with the parallel non-return valve and baffler; two working cylinders are respectively controlled by two oil cylinders whose heads are connected with the pressure oil and oil return circuit of the main valve; the pressure oil in front of the main valve is also connected through the baffler and a pressure reducing valve with the cylinder tails of the two oil cylinders which can work alternately. Practice proves that this solution has the advantages of homogeneous displacement, little noise and vibration.

Description

The low noise hydraulic control system that is used for the twin-tub single-acting pump

The utility model belongs to fluid machinery, and it relates to a kind of structure of low noise hydraulic control system of twin-tub single-acting pump.

The inventor has proposed the new departure of a kind of " Sungle-cylinder, double-action type hydraulic slurry pump " in the CN92108815.9 patent, it is specially adapted to the transmission of the mud liquid of the big proportion of petroleum industry medium-high viscosity.Before this, carrying the pump of the single-cylinder single-acting form of liquid is 3.14 because of nonuniformity of displacement, does not therefore have Practical significance; The nonuniformity of displacement of duplex double action pump is 0.314; And occurred and three developed cylinder single-acting formula pumps since the sixties, its uneven degree is 0.141, make working efficiency be significantly improved, but these all are that employing is mechanically operated, the inventor has adopted the hydraulic transmission mode of hydraulic pressure automatic control reversing arrangement in aforementioned patent, adopted the two hydraulic jacks of lifting one's head piston rod of the coaxial double-action of single cylinder to drive, by facts have proved that it has replaced Mechanical Driven with hydraulic transmission, shown compact structure, volume is little in light weight, and efficient height, fault is few, and it has obtained nonuniformity of displacement and has been almost 0 ideal curve and working stability.But also find following problem: directly drive the single-cylinder dual-action pump that the piston of clutch release slave cylinder makes with oil cylinder and have the contradiction that can't overcome through practice, for making the fluid jet that pumps continuous as far as possible, significantly do not interrupt, must shorten the turn around time of oil cylinder, accelerate its commutating speed.And commutating speed fastoperation is just big more in the inertial force of intrasystem liquid more, the hydraulic shock of generation and noise and vibration are just big more, force this pump only to be suitable for low power occasion.

The purpose of this utility model is to overcome the existing problem of aforementioned single-cylinder dual-action pump, adapts to powerful needs, and satisfies form and adapted novel hydraulic-control system that discharge capacity is stable, noise is low requirement spy provides following twin-tub single-acting formula oil hydraulic pump.

By as above design, this programme proposes to be used for the low noise hydraulic control system of twin-tub single-acting pump, include the pilot valve (4) of two ends band pilot valve controllers (12), main reversing valve (3), handcontrolled manipulation valve (2), relief valve (9) and oil pump (1), asphalt network between them is that the two-way of pressure oil and oil return leads to the two ends of oil cylinder and leads to the inner of pilot valve controller simultaneously through selector valve, this two-way is controlled the liquid controlling device at its selector valve two ends through pilot valve, the signal pipeline at oil cylinder two ends leads to the outer end of pilot valve controller, its concrete feature is: all go here and there the assembly of an one-way valve in parallel (11) and throttle valve (10) between the liquid controlling device at its pilot valve (4) and main reversing valve (3) two ends, each one-way valve all points to the direction that pressure oil is passed through, the pipeline of pressure oil and oil return leads to two oil cylinders that work alone (7) through main reversing valve (3), (8) cylinder head, two oil cylinders (7), (8) cylinder tail oil circuit UNICOM, pressure oil circuit P point before main reversing valve communicates with the oil circuit H of two oil cylinder tails through big throttle valve (18) and reduction valve (6), and W o'clock while communicated with oil sump (7) through a back pressure valve (5); Its main reversing valve (3) is a 3-position 4-way control valve, its position, left side and the oily flow path direction of the right interchangeable change in position, and position is the cylinder head that the pressure oil separated into two parts is flowed to two oil cylinders in the middle of it, no oil return circuit.

Two oil cylinders (7) in this programme, (8) drive two single-acting clutch release slave cylinders (13) (14) arranged side by side respectively coaxially and form two complementary work loops in parallel.

Adopt this programme can embody following superiority: 1. two replace the piston that automatic reciprocating oil cylinder drives two clutch release slave cylinders respectively, form twin-tub single-acting formula oil hydraulic pump, the discharge capacity of two cylinders compensates automatically in replacing the discharge opeing commutation process, make synthetic discharge capacity become a flat curve, do not have the interruption on a fluid stream; 2. the oil cylinder commutation time have one section overlapping, the overlapping time is adjustable, thereby has adjusted commutating speed, and noise and vibration are significantly descended; 3. this programme is a kind of low noise hydraulic control system, also can electricity consumption prosecutor formula realize.

Fig. 1 is a complete set of schematic diagram that this programme is used for the low noise hydraulic control system of twin-tub single-acting pump.

Fig. 2 is the structural representation of pilot valve controller.

Fig. 3 is the hydraulic schematic diagram of patent " Sungle-cylinder, double-action type hydraulic slurry pump " before the inventor.

The embodiment of existing accompanying drawings present technique.The pressure oil that oil pump (1) pumps enters the hydraulic control system loop through manual control valve (2), pressure oil leads to oil sump (17) through relief valve (9) before hand control valve, pressure oil leads to two oil cylinders (7) through main reversing valve (3), (8), two oil cylinders drive two clutch release slave cylinders (13) respectively, (14), pilot valve controller (12) all is equipped with at the two ends of pilot valve (4), in small plunger (16) and big plunger (15) are arranged, all go here and there the assembly of one-way valve in parallel (11) and throttle valve (10) between the liquid controlling device at pilot valve and main reversing valve two ends, pressure oil before the main reversing valve also also can lead to oil sump (17) through back pressure valve (5) when a big throttle valve (18) and reduction valve (16) lead to the oil cylinder afterbody

The motion of the oil cylinder in this programme (7), (8) is controlled by main reversing valve (3), the working position of main reversing valve (3) is controlled by pilot valve (4), and the working position of pilot valve (4) changes the hydraulic pressure signal control of generation by the piston position of oil cylinder (7), (8), thereby constitutes the automatic control system of closed loop.When a certain oil cylinder is pushed to right-hand work by pressure oil, the oil that it is discharged drives another cylinder and makes drawback movement, simultaneously pressure oil through expenditure and pressure after the W point is delivered to H, make another oil cylinder have opening speed greater than feed speed, arrive the backhaul dead point in advance, the cylinder of feeding reduced speed now before arriving reversing point, the cylinder of backhaul has simultaneously commutated and has finished, and also begins to travel forward, like this, two cylinders have one section march forward simultaneously to process, first cylinder slows down gradually, and second cylinder quickens gradually, first cylinder during to reversing point speed drop to 0, it is maximum that second cylinder speed reaches, march forward to second cylinder fluid of discharging make the cylinder of winning quicken to return.So alternate reciprocating motion is gone down.The length-adjustable of that section overlapping time of two cylinders feeding simultaneously.

The working principle of this machine is as follows: the hydraulic fluid port P that is delivered to main reversing valve (3) by prime mover driven oil pump (1) pressure oil output through manual control valve (2) simultaneously, the hydraulic fluid port Q of the hydraulic fluid port R of pilot valve (4) and reduction valve (6), pressure oil enters the piston cavity of oil cylinder (7) through PAC, push piston right lateral feeding at full speed, make clutch release slave cylinder (13) discharge working medium, fluid in the rod end chamber of oil cylinder (7) enters the rod end chamber of oil cylinder (8) through H, meanwhile, pressure oil also enters the rod end chamber of oil cylinder (8) after the QWH decompression, make piston fast to left movement, clutch release slave cylinder (14) sucks working medium.Fluid in the piston cavity of oil cylinder (8) returns oil sump (17) through DBTZG, dead point after the piston of oil cylinder (8) arrives in advance, and the piston of oil cylinder (7) still continues to move right, at this moment, the fluid of discharge is through HWG oil return pond (17).The function of back pressure valve (5) and reduction valve (6) is that the assurance oil cylinder can be return fast.

Pressure oil acts on the A2 area of pilot valve controller (12) through PAJ, small plunger (16) is stretched out to the right, keep pilot valve to be in the working state of position, a left side, pressure oil also enters the left liquid control chamber of main reversing valve (3) through RSM, make main reversing valve (3) also be in the work of position, a left side, keep oil cylinder (7) stable operation.

When the piston back edge of oil cylinder (7) skims over hydraulic fluid port E, pressure oil enters in the right controller (12) of pilot valve through EL, the structure of two pilot valve controllers is identical, but the directed in opposite of small plunger, big plunger (15) is to left movement, the A1 area of right-hand member is greater than the A2 of left end, right-hand member thrust left is greater than left end thrust to the right, the pilot valve displacement becomes the work of right position, pressure oil is through the right liquid controling cavity of PRVN to main reversing valve, make the main reversing valve commutation, the fluid of the left liquid controling cavity of main reversing valve (3) is through MSUZG oil return pond (17).In the MS way, to pass through the size that throttle valve (10) changes restriction, the travelling speed of can regulate main reversing valve spool, the meta function of main reversing valve is that special PAB can make the piston of oil cylinder (7), (8) move right simultaneously, reach right position up to main valve, switch and finish the side, the piston of oil cylinder (7) reaches preceding dead point, and the piston of oil cylinder (8) reaches right lateral feeding at full speed when preparing to return.

This programme pilot sample is through running proof: it have discharge capacity steadily desirable, noise is low, Vibrate little advantage, applicable to working in the power 400KW scope.

Claims

1, a kind of low noise hydraulic control system that is used for the twin-tub single-acting pump, it includes the pilot valve (4) of two ends band pilot valve controllers (12), main reversing valve (3), handcontrolled manipulation valve (2), relief valve (9) and oil pump (1), asphalt network between them is that the two-way of pressure oil and oil return leads to the two ends of oil cylinder through selector valve, the inner of leading to the pilot valve controller simultaneously, this two-way is controlled the liquid controlling device at its selector valve two ends through pilot valve, the signal pipeline at oil cylinder two ends leads to the outer end of pilot valve controller, all go here and there the assembly of an one-way valve in parallel (11) and throttle valve (10) between the pilot valve (4) that it is characterized in that it and the oil circuit of main reversing valve (3) two ends liquid controlling device, each one-way valve all points to the direction that pressure oil is passed through, the pipeline of pressure oil and oil return leads to two oil cylinders that work alone (7) through main reversing valve (3), (8) cylinder head, two oil cylinders (7), (8) cylinder tail oil circuit UNICOM, pressure oil circuit P point before main reversing valve communicates with the oil circuit H of two oil cylinder tails through big throttle valve (18) and reduction valve (6), and W o'clock while communicated with oil sump (7) through a back pressure valve (5); Its main reversing valve (3) is a 3-position 4-way control valve, its position, left side and the oily flow path direction of the right interchangeable change in position, and position is the cylinder head that the pressure oil separated into two parts is flowed to two oil cylinders in the middle of it, no oil return circuit.

2, according to the described hydraulic control system of claim 1, it is characterized in that its two oil cylinders (7), (8) drive two single-acting clutch release slave cylinder (13), (14) arranged side by side respectively coaxially, they are two complementary work loops in parallel.