riken seiki hydraulic pump made in china

"A single acting cylinder is operated by the remote controlled operating switch. The pump stops automatically and the cylinder returns at a preset pressure of the pressure switch"

Hydraulic pumps are vital to the role of heavy equipment such as excavators, tractors, forklifts and cranes. The hydraulic pump converts mechanical energy into hydraulic energy through the movement of the fluid in the conveying pipeline, thereby driving the equipment to work. It can determine the effectiveness of these devices on the job site. If the hydraulic pump fails or runs below an acceptable level, it needs to be repaired immediately to avoid sudden equipment shutdowns and greater losses.

Elephant Fluid Power provides repair parts for tractor hydraulic pump overhaul, excavator hydraulic pump repair, forklift hydraulic pump repair, etc. It also provides hydraulic pump repair kits for many heavy equipment manufacturers, hydraulic brands and hydraulic product distributors, such as John Deere hydraulic pump repair, rv hydraulic pump repair, enerpac hydraulic pump repair, HITACHI hydraulic pump repair, KAWASAKI hydraulic pump repair, UCHIDA hydraulic pump repair, MITSUBISHI hydraulic pump repair, CAT hydraulic pump repair, Komatsu hydraulic pump repair, NACHI hydraulic pump repair, NABTESCO hydraulic pump repair, KAYABA hydraulic pump repair, LIEBHERR hydraulic pump repair, DOOSAN hydraulic pump repair, DAIKIN hydraulic pump repair, SAUER hydraulic pump repair, SUNDUSTRAND hydraulic pump repair, SHIBAURA hydraulic pump repair, TEIJIN SEIKI hydraulic pump repair, VOLVO hydraulic pump repair, JCB hydraulic pump repair, LINDE hydraulic pump repair, HYDROMATIC hydraulic pump repair, EATON hydraulic pump repair, REXROTH hydraulic pump repair and other major brand repairs

Figure 10 represents the chart that is used for electric power, pump power and the spinner velocity of drive unit according to of the present invention;

The known piston pump that has bent axle and crosshead shown in Fig. 1.As we can see from the figure, although in fact do not comprise motor, bent axle and crosshead still need sizable space and heavy element.In ensuing embodiment, described the driver element that replaces the part in the dotted line among Fig. 1, and driver element comprises drive motor in addition for mode of execution.

The signal principle sketch map of the drive unit 11 of first diaphragm pump shown in Fig. 2 and the second diaphragm pump 13a, 13b.Diaphragm pump 13a, 13b have its inlet valve 15a, 15b respectively separately and have its outlet valve 17a, 17b separately.

The pressure difference that inlet valve and outlet valve rely on thereon opens and closes.Valve also can be controlled by other mode, for example electricity or hydraulic control.The arrow that is comprised is represented the flow direction of diaphragm pump 13a, 13b.

Yet the present invention is not limited to diaphragm pump or such a pump.Thereby can for example be used for the operation of compressor or other equipment according to drive unit of the present invention.The signal principle sketch map of the 13a of diaphragm pump shown in Fig. 3, as shown in Figure 2, and the signal principle sketch map of flexible pipe diaphragm pump 13c.Pump and compressor suppose it is known to those skilled in the art, will be not described further here.As an alternative, the drive unit 11 that is used for this class device will be described in further detail.

Refer again to Fig. 2.Drive unit 11 comprises cylinder blanket 19.Be provided with first piston and the second piston 21a, 21b in shell 19, first piston and the second piston 21a, 21b are connected to each other by piston rod 23.Piston withstands on the internal face of shell 19 by Sealing 25a, 25b, and Sealing 25a, 25b form barrier in each side of each piston 21a, 21b like this.Piston also can be set in place in the other cylindrical body (cylinder) or sleeve pipe of shell 19 inside.Thereby, between the barrier film 29a of the first piston 21a and the first diaphragm pump 13a, the first functional compartments 27a is set at the left-hand side of first piston 21a.Correspondingly, between the barrier film 29b of the second piston 21b and the second diaphragm pump 13a, the second functional compartments 27b is set.

The special advantage of using liquid in shell 19 is that therefore drive unit will be suitable for using under high pressure particularly well, for example at very big sea water advanced place.In addition, if diaphragm pump 13a is connected to identical source with 13b (Fig. 2), the pressure in this source will act on the both sides of drive unit, promptly respectively on left side and the right side of first piston and the second piston 21a, 21b.Thereby electric notor does not need to offset constant back pressure (counter pressure), must offset if it moves a piston.In addition, another advantage is that the pressure on piston 21a, the 21b falls and becomes littler, makes to produce still less leakage on Sealing 25a, 25b.If the driving media in first functional compartments and the second functional compartments 27a, the 27b be with first piston and the second piston 21a, 21b between the identical liquid of liquid in the fluid chamber 41, then this assembly advantageous particularly that becomes.Leaking on Sealing 25a, 25b is the effect that performance is less.In addition, the liquid in the fluid chamber 41 can be advantageously provided under pressure, and the outer liquid of this flowing fluid ratio piston 21a, 21b has higher pressure like this.Possible leakage just will betide the outside direction from this fluid chamber 41, make fluid wherein not have contaminated.This will cause the reliability of long durability of device and operation.Liquid in the fluid chamber 41 will advantageously cool off and lubricated electric notor 31 and other mechanical moving elements, such as cylinder screw device 33.

Replace and use liquid as driving media so that power is transmitted to barrier film 29a, 29b from piston 21a, 21b, the example of mentioning in the image pattern 2 is the same, and this drive unit also can come driven pump or compressor by the mechanical transmission of power.Replace (or two a) piston, this drive unit can thereby directly be connected to, for example, and the barrier film in the diaphragm pump.Also can utilize the device that does not have barrier film 29a, 29b shown in Fig. 2.So piston 21a, 21b directly contact with the media of pumping.

Fig. 4 has shown the mode of execution selected of assembly as shown in Figure 2.Assembly among Fig. 4 only connects a pump.At the right-hand side of assembly, piston 21b is retained, but corresponding to the chamber of the second functional compartments 27b among Fig. 2 vent is arranged, and for example can fill with gas towards barometric pressure or its.By keep the second piston 21b obtain to fluid chamber"s 41 superchargings may, and thereby obtain the above-mentioned advantage of mentioning, although in fact this drive unit only moves a pump.

Fig. 8 and Fig. 9 have shown the specific embodiment of the mode of execution that drive unit is used, such as the above-mentioned drive unit according to first aspect present invention.Shown among the figure and comprised two drive units 103 of type and the pump assembly 101 of four flexible pipe diaphragm pumps 105 as shown in Figure 2.The import of four flexible pipe diaphragm pumps 105 advantageously is connected to same source, and its outlet also makes up, thereby pump assembly 101 has the function of a logic pump unit (logic pump unit).As in reference to figure 2 described driver elements, the import of flexible pipe diaphragm pump 105 is at its inlet valve 15 " separately, and the outlet of flexible pipe diaphragm pump 105 is at its outlet valve 17 " separately.

For functional compartments 27 " and the flexible pipe diaphragm pump 105 that connects drive unit 103, between functional compartments 27 " and flexible pipe diaphragm pump 105, be provided with the fluid passage of connecting tube 109 forms.Connecting tube 109 has been formed the part of common chamber, comprises the chamber 27 of barrier film 111 outsides of functional compartments 27 " in the drive unit 103 and pump 105 " (Fig. 9).

Shown the more details of flexible pipe diaphragm pump among Fig. 9.Barrier film 111 has the shape of flexible pipe and extends between inlet valve 15 " and outlet valve 17 ".Valve 156 ", 17 " is a safety check.

By using two electric notors 31, i.e. the mode that electric notor in each drive unit 103, two electric notors 31 can advantageously in the opposite direction be rotated with them drives.The moment of torsion of entire pump assembly 101 can be cancelled like this.

Two flexible pipe diaphragm pumps 105 that are connected to same drive unit 103 will be driven with opposite phases with this structure.That mean when a pump 105 when drive unit 103 receives the pressure that increases, the pressure that another pump 105 reduces reception.In addition, can be driven by this way as Fig. 8 and 101, two drive units 103 of pump assembly shown in Figure 9: one lags behind another four/one-period (cycle) or 90 °.

Also it is contemplated that the drive unit 103 that in the pump assembly, is provided with more than two.For example, three or more drive units can be set, it is connected to for example six or more pumps.Highly stable suction for the media that will be pumped can be provided like this, will reduce the wearing and tearing and so on of mechanical part.In device, can be for example spend in the cycle each pump and carry out pump at 60 degree and take out 360 with six pumps.Perhaps can its each other the mode of crossover pump is set, such as by this way: each pump is applied to spend 360 and carries out pump in the cycle during 70 degree and take out.During each pumping function first 5 the degree and last 5 the degree thereby can in circulation, be public with a previous and back pump respectively.

Using the special benefits of electric notor in this drive unit is the possibility of quantitative piston rod stroke.Figure 10 has described the example in a complete stroke length (stroke directions) suction, and wherein whole energy of rotations of motor (and nut and possible gearing) are delivered to pump media (liquid in Fig. 2 between piston 21a, 21b and barrier film 29a, the 29b).Can see that from the spinner velocity chart of electric notor rotor process can be divided into boost phase that spinner velocity increases, spinner velocity with general profile, and stabilization sub stage and spinner velocity are reduced to last decelerating phase of zero rotation relatively stably.In addition, more near the end in cycle, many more electric energy are used to piston is advanced towards terminal position, and this is typical.

Figure 11 has shown the example that aspirates in whole running length, be delivered to the pump media in the part of this energy of rotation, and wherein other energy of rotation is taken back by utilizing motor to make rotational delay.Therefore electric notor has the function of generator in the last part of running length.The electric energy that produces can for example be stored in the capacitor battery in the centre or be directly passed to another electric notor, for example the electric notor in another drive unit.

The electric control of electric notor thereby advantageously provide much possibilities about the favourable control of motor.The speed that the media that can for example be pumped based on parameter and the condition (temperature, the fluid type in the fluid chamber, life-span etc.) of condition (temperature, viscosity, proportion etc.) and drive unit thereof are come governor motor, its acceleration and moment of torsion.In addition, when determining the speed that needs, can advantageously pay attention to eigen frequency.

Figure 13 has described the velocity curve of two drive units in the pump assembly.The pump assembly preferably can be with reference to figure 8 and 9 described pump assemblies (101).Two drive units can be according to above-mentioned drive unit 103.

Curve among Figure 13 has been illustrated the absolute velocity of four piston A, B, C and D, and wherein first drive unit 103 comprises two piston A and B, and second drive unit 103 comprises two piston C and D.About the left-hand side of Figure 13, see that piston A accelerates to normal speed 1 from zero velocity, has constant acceleration.At the end of a stroke of piston rod 23, speed is zero.Neutral position between the end positions that is positioned at reciprocating stroke path (reciprocating stroke path), speed is its maximum value.According to the curve among Figure 13, when A had been finished a pumping action to the pump 105 (referring to Fig. 8 and Fig. 9) that is linked to each other with the B piston, the one-period of a drive unit 103 was performed and finishes.

The curve of the C of second drive unit 103 and D piston lags behind 90 ° of the curves or the four/one-period of first drive unit 103.As demonstrating among Figure 13, the summation of two curves of first and second drive units 103 is constants.The addition that is its absolute velocity is " 1 " (standardized) always.This feature causes the constant pumping velocity of pump assembly 101, does not does not rise and fall.

Figure 15 has described the speed that two piston rods of first and second drive units 103 (referring to Fig. 8 and Fig. 9) of pump assembly 101 produce.See obviously among Figure 15 that the velocity curve of generation is " cap function (hat functions) " or leg-of-mutton function.This function is the result of acceleration diagram integration among Figure 16.

Advantageously, according to this embodiment, do not have the mutation movement of piston rod 23.Yet in operation envelope (operational envelope), the motion of piston in fact can be with required equally unsmooth, to guarantee to come the constant compound flow of self-pumping picking device.This feature additional advantage is to have reduced the wearing and tearing on the connection device, such as pipe and valve.

Figure 17 has shown the moment of torsion on two piston rods 23 separately of each drive unit 103 of pump assembly 101.Induce acceleration and the torque curve seen from two drive units 103 electric notor 31 separately are similar to, and equal half of other curves its cycle time.To be constant between two point of intersection in neutral position from motor by the power that cylinder screw arbor assembly 33 is applied on the piston rod.Yet because the direction of electric notor position change endways, torque curve has the cycle of half with respect to curve shown in other.This means that the power that passes to the pump assembly 101 with two drive units 103 will keep constant, as seeing in the power network.Figure 18 has shown the curve identical with Figure 17, yet has some demonstrations about quickening and slow down with driver I and shown two drivers of driver II.

Figure 19 has shown how the piston rod velocity curve relevant with pumping velocity changes.For the constant summation of two speed keeping first and second drive units 103, when first device reduced its speed, second drive unit must correspondingly reduce its speed, and their cycle has identical length like this.This is by having two different speed V among Figure 19

In addition, it is contemplated that in a pump assembly and to use even more than two drive unit 103, such as three, four or even more, as long as the adding and keep constant in time of instantaneous velocity.The described acyclic combination that also comprises velocity curve.

In addition, in the favourable mode of execution of the pump assembly of second aspect, drive unit 103 is suitable for controlling according to the working condition of another driving element 103 according to the present invention.This is illustrated in Figure 20, and Figure 20 has shown the velocity curve of two drive units 103 in the pump assembly 101 (referring to Fig. 8 and Fig. 9).Each drive unit 103 is connected to two pumps 105 or head (pump head).The sensor device of electric notor 31 and/or electric notor controller (not shown) can provide the input about drive unit 103 working conditions.In the situation shown in this figure, the first drive unit A (solid line) in a stroke at time t

1Change its accekeration.The reason of this change can be change or other the outside or inner reason that pump is taken out media.The second drive unit B (dotted line) is suitable for this change to keep constant comprehensive speed (referring to real horizontal curve (continuous horizontal curve)).The second drive unit B thereby at time t

According to the drive unit of first aspect present invention, or the drive unit that uses in the pump assembly according to second aspect present invention can advantageously produce nearly boosting of 90 crust, with the capacity of 3000l/min.More specifically, itself in addition can produce nearly boosting of 120 crust, with the capacity of 4000l/min.