CN105257494A - Multi-row digital axial plunger piston pump controlled by flow discrete combination switch and control method for multi-row digital axial plunger piston - Google Patents

Abstract

A multi-row digital axial piston pump controlled by flow discrete combination switches and a control method thereof. The plunger pump casing, the rear end cover and the rear end cover are sealed in sequence; the swash plate is installed inside the plunger pump casing through the first bearing; the main shaft passes through the plunger pump casing, the swash plate, and the plunger cavity in sequence and the second bearing; the main shaft is connected with the swash plate through a key, and the rotation of the main shaft drives the swash plate to rotate; the ball head of the inner plunger is installed in the spherical sleeve of the inner shoe; the ball head of the outer plunger is installed in the spherical sleeve of the outer shoe middle; the inner shoe and the outer shoe are tightly pressed on the swash plate, and the rotation of the swash plate will drive the inner plunger, and the outer plunger will reciprocate in the plunger cavity; There are oil inlet passages and oil outlet passages; the first inlet on-off valve and the first outlet on-off valve are installed at the inner plunger oil inlet passage and oil outlet passage; the outer plunger oil inlet passage and oil outlet passage Correspondingly install the second inlet on-off valve and the second outlet on-off valve.

Description

Multi-row digital axial piston pump controlled by flow discrete combination switch and its control method

technical field

The invention relates to digital hydraulic component technology, in particular to designing a multi-row digital axial plunger pump controlled by flow discrete combined switches and a control method thereof.

Background technique

Digital switch control technology is a new type of control technology in the field of hydraulics. It greatly reduces the throttling loss and anti-interference of traditional hydraulic valve control systems and components through the control characteristics of fully open or fully closed switch valves. At the same time, combined with digital control technology, the operability and flexibility of the components can be effectively improved. With the improvement of the frequency response of the switch valve, each output plunger (piston) of the multi-cylinder pump can be independently controlled, making the variable mode of the pump easier and more convenient to control. At the same time, through the combination of each output plunger (piston), the output pulsation of the pump can be effectively reduced, and the service life of the pump can be improved.

Contents of the invention

The purpose of the present invention is to design a multi-row digital axial piston pump controlled by a flow discrete combination switch, through the combined control of the inlet switch valve and the outlet switch valve, the variable characteristics of the axial piston pump can be realized.

In order to achieve the above object, the technical scheme adopted in the present invention is as follows:

A multi-row digital axial plunger pump controlled by a flow discrete combination switch includes a plunger pump housing, an inner plunger, an outer plunger, a plunger cavity, a swash plate, a main shaft, a first inlet switch valve, and a second inlet On-off valve, first outlet on-off valve, second outlet on-off valve, rear end cover, inner sliding shoe, outer sliding shoe, key, first bearing, second bearing, rear end cover; the interconnection relationship is as follows:

The plunger pump casing, the rear end cover and the rear end cover are sealed in sequence; the swash plate is installed inside the plunger pump casing through the first bearing; the main shaft passes through the plunger pump casing, the swash plate, and the plunger cavity in turn and the second bearing; the main shaft is connected to the swash plate through a key, and the rotation of the main shaft drives the swash plate to rotate; the ball head of the inner plunger is installed in the spherical sleeve of the inner sliding shoe; the ball end of the outer plunger is installed in the spherical sleeve of the outer sliding shoe middle; the inner and outer sliders are tightly pressed on the swash plate, and the rotation of the swash plate will drive the inner plunger and the outer plunger to reciprocate in the plunger cavity; There are oil inlet passages and oil outlet passages; the first inlet on-off valve and the first outlet on-off valve are installed at the inner plunger oil inlet passage and oil outlet passage; the outer plunger oil inlet passage and oil outlet passage Correspondingly install the second inlet on-off valve and the second outlet on-off valve.

The first inlet on-off valve, the second inlet on-off valve, the first outlet on-off valve, and the second outlet on-off valve realize the control of the input flow and output flow of each plunger through pulse control.

The axial plunger pump is a multi-row plunger pump. Multiple rows of plungers can be installed on the plunger cavity, and the diameters of the installed plungers can be the same or different.

The key is a flat key, a semicircular key, a wedge key, a tangential key or a spline.

The number of plungers installed in each row of the plunger cavity can be even or odd.

The digital axial piston pump controlled by a flow discrete switch also includes an oil inlet and an oil outlet, and the oil inlet and the oil outlet are arranged on the rear end cover.

The flow control method of the plunger pump is characterized in that: three output modes of zero flow output, full flow output and combined flow output are realized by combining the plunger in the output working condition,

At zero flow output, when the inner plunger and outer plunger are sucking oil, the first inlet on-off valve and the second inlet on-off valve are always in the open state, and the plunger pump has no flow output at this time;

At full flow output, when the pump sucks oil, open all the first inlet switch valves corresponding to the inner plunger, open all the second inlet switch valves corresponding to the outer plunger, and open all the first outlets corresponding to the inner plunger when the pump discharges oil On-off valve, open all the second outlet on-off valves corresponding to the outer plunger;

When combined flow output, because the distribution circle diameters of the inner plunger and the outer plunger are different, the output flow corresponding to the inner plunger and the outer plunger is also different. First, determine the number n1 of the inner plunger and the outer The number of plungers is n2. At this time, the number of inner plungers that do not need to output oil flow in the plunger pump is m1-n1, where m1 is the total number of inner plungers, and the number of outer plungers that do not need to output oil flow is m2 -n2 where m2 is the total number of outer plungers; when the plunger pump sucks oil, open all the first inlet on-off valve and the second inlet on-off valve, and when the plunger pump discharges oil, open n1 inner plunger volumes for flow output The first outlet switch valve corresponding to the cavity makes the pump discharge oil, and the remaining m1-n1 inner plungers open their corresponding first inlet switch valves, and at the same time open the second corresponding to the n2 outer plunger cavities for flow output. The outlet switch valve makes the pump discharge oil, and the remaining m2-n2 outer plungers open their corresponding second inlet switch valves, so that the oil in the inner and outer plunger chambers flows back into the pump oil inlet to adjust the output flow of the plunger pump .

The beneficial effects that the present invention has are:

1. Since the output flow corresponding to the inner and outer plungers is different, the pulsation of the plunger pump can be effectively reduced by combining the output modes of the inner and outer plungers;

2. The flow discrete switch control digital axial piston pump has the advantages of digital control technology, flexible control, strong anti-interference ability and good control characteristics;

3. Discrete flow switch control The digital axial piston pump applies switch control technology, which has the advantages of simple structure, fast action, strong anti-pollution ability, high reliability and low processing cost.

Description of drawings

Figure 1 is a schematic structural diagram of a multi-row digital axial piston pump controlled by a flow discrete combination switch;

Figure 2 is a cross-sectional view of the structure of a multi-row digital axial piston pump controlled by a flow discrete combination switch;

Fig. 3 is a schematic diagram of a control method for a multi-row digital axial piston pump controlled by flow discrete combination switches.

In the figure: 1. Piston pump casing, 2. Inner plunger, 3. Outer plunger, 4. Plunger cavity, 5. Swash plate, 6. Main shaft, 7. First inlet switch valve, 8. Second Two inlet on-off valves, 9, the first outlet on-off valve, 10, the second outlet on-off valve, 11, the rear end cover, 12, the inner sliding shoe, 13, the outer sliding shoe, 14 key, 15, the first bearing, 16, Second bearing, 17, rear end cover plate, 18, oil inlet, 19, oil outlet.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific examples, and this embodiment should not be regarded as a limitation of the present invention.

As shown in Figure 1 and Figure 2, a multi-row digital axial plunger pump controlled by a flow discrete combination switch includes a plunger pump housing 1, an inner plunger 2, an outer plunger 3, a plunger cavity 4, an inclined Disc 5, spindle 6, first inlet on-off valve 7, second inlet on-off valve 8, first outlet on-off valve 9, second outlet on-off valve 10, rear end cover 11, inner shoe 12, outer shoe 13, key 14. The first bearing 15, the second bearing 16, and the rear end cover plate 17; the interconnection relationship is as follows:

The plunger pump casing 1, the rear end cover 11 and the rear end cover plate 17 are sequentially sealed and connected; the swash plate 5 is installed inside the plunger pump casing 1 through the first bearing 15; the main shaft 6 passes through the plunger pump casing 1 in sequence , the swash plate 5, the plunger chamber 4 and the second bearing 16; the main shaft 6 is connected with the swash plate 5 through the key 14, and the rotation of the main shaft 6 drives the swash plate 5 to rotate; the ball head of the inner plunger 2 is installed in the inner sliding shoe 12 The ball head of the outer plunger 3 is installed in the spherical sleeve of the outer shoe 13; the inner shoe 12 and the outer shoe 13 are tightly pressed on the swash plate 5, and the rotation of the swash plate 5 will drive the inner plunger 2, The outer plunger 3 reciprocates in the plunger cavity 4; the position of the rear end cover 8 corresponding to the inner and outer plungers is respectively provided with an oil inlet channel and an oil outlet channel; the inner plunger 2 has an oil inlet channel and an oil outlet channel. The first inlet on-off valve 7 and the first outlet on-off valve 9 are correspondingly installed at the flow channel; the second inlet on-off valve 8 and the second outlet on-off valve 10 are correspondingly installed on the oil inlet and outlet channels of the outer plunger 3 .

The first inlet on-off valve 7, the second inlet on-off valve 8, the first outlet on-off valve 9, and the second outlet on-off valve 10 realize the control of the input flow and output flow of each plunger through pulse control.

The axial plunger pump is a multi-row plunger pump. Multiple rows of plungers can be installed on the plunger cavity 4, and the diameters of the installed plungers can be the same or different.

The key 14 is a flat key, a semicircular key, a wedge key, a tangential key or a spline. The number of plungers installed in each row of the plunger cavity 4 can be an even number or an odd number.

According to an embodiment of the present invention, the digital axial piston pump controlled by a flow discrete switch further includes an oil inlet 18 and an oil outlet 19, and the oil inlet 18 and the oil outlet 19 are arranged on the rear end cover 11 on.

As shown in Figure 3, it is a flow control method of a digital axial piston pump controlled by a flow discrete switch. The output modes that can be realized by combining the plungers in the output state include zero flow output, full flow output and combined flow output. It is characterized in that: when there is zero flow output, when the inner plunger 2 and the outer plunger 3 absorb oil, the first inlet on-off valve 7 and the second inlet on-off valve 8 are always in the open working condition, and the plunger pump has no flow output at this time ;When outputting at full flow, when the pump sucks oil, open all the first inlet on-off valves 7 corresponding to the inner plunger 2, open all the second inlet on-off valves 8 corresponding to the outer plunger 3, and open the inner plunger 2 when the pump discharges oil. All corresponding first outlet on-off valves 9 open all the second outlet on-off valves 10 corresponding to the outer plunger 3; when combined flow output, since the distribution circle diameters of the inner plunger 2 and the outer plunger 3 are different, the inner column The output flow corresponding to the plug 2 and the outer plunger 3 is also different, so the number n1 of the inner plunger and the number n2 of the outer plunger used for oil discharge are firstly determined. At this time, there is no need for oil flow output in the plunger pump The number of inner plungers is m1-n1 (m1 is the total number of inner plungers), and the number of outer plungers that do not need to output oil flow is m2-n2 (m2 is the total number of outer plungers); when the plunger pump sucks oil, open All the first inlet on-off valve 7 and the second inlet on-off valve 8, when the plunger pump discharges oil, open the first outlet on-off valve 9 corresponding to the n1 inner plunger cavities used for flow output to discharge the pump, and the remaining m1 -n1 inner plunger will open its corresponding first inlet on-off valve 7, and at the same time open the second outlet on-off valve 10 corresponding to n2 outer plunger cavities for flow output to discharge oil from the pump, and the remaining m2-n2 The outer plunger opens its corresponding second inlet switch valve 8, so that the oil in the inner and outer plunger cavities flows back into the pump oil inlet to adjust the output flow of the plunger pump.

Claims (7)

1. many rows digital axial piston pump of a flow discrete combination switch control rule, it is characterized in that: comprise plunger pump shell (1), inner plunger (2), outer plunger (3), plunger cavity (4), swash plate (5), main shaft (6), first inlet switch valve (7), second inlet switch valve (8), first gate out switch valve (9), second gate out switch valve (10), rear end cover (11), interior piston shoes (12), outer piston shoes (13), key (14), clutch shaft bearing (15), second bearing (16), rear-end plate (17), interconnected relationship is as follows:

Plunger pump shell (1), rear end cover (11) and rear-end plate (17) are tightly connected successively; It is inner that swash plate (5) is arranged on plunger pump shell (1) by clutch shaft bearing (15); Main shaft (6) is successively through plunger pump shell (1), swash plate (5), plunger cavity (4) and the second bearing (16); Main shaft (6) is connected with swash plate (5) by key (14), and main shaft (6) rotarily drives swash plate (5) and rotates; The bulb of inner plunger (2) is arranged in the sphere cover of interior piston shoes (12); The bulb of outer plunger (3) is arranged in the sphere cover of outer piston shoes (13); Interior piston shoes (12) and outer piston shoes (13) are pressed on swash plate (5), and swash plate (5) rotation can drive the to-and-fro motion in plunger cavity (4) of inner plunger (2), outer plunger (3); The position of the upper corresponding interior outer plunger of rear end cover (8) has oil-feed runner and fuel-displaced runner; Inner plunger (2) oil-feed runner and fuel-displaced runner place correspondence install the first inlet switch valve (7) and the first gate out switch valve (9); Outer plunger (3) oil-feed runner and fuel-displaced runner place correspondence install the second inlet switch valve (8) and the second gate out switch valve (10).

2. many rows digital axial piston pump of a kind of flow discrete combination switch control rule according to claim 1, it is characterized in that: the first described inlet switch valve (7), second inlet switch valve (8), first gate out switch valve (9), the second gate out switch valve (10) realizes the control to each plunger input flow rate and output flow by Pulse Width Control.

3. many rows digital axial piston pump of a kind of flow discrete combination switch control rule according to claim 1, it is characterized in that: more described axial piston pump arranges plunger pump, (4) can install many organ timberings plug to plunger cavity, and the diameter of the plunger installed can be the same or different.

4. many rows digital axial piston pump of a kind of flow discrete combination switch control rule according to claim 1, is characterized in that: described key (14) is flat key, woodruff key, wedge key, tangent key or spline.

5. many rows digital axial piston pump of a kind of flow discrete combination switch control rule according to claim 1, is characterized in that: the plunger number that plunger cavity (4) often arranges installation can be even number also can be odd number.

6. a kind of flow discrete switch control figure formula axial piston pump according to claim 1, characterized by further comprising filler opening (18) and oil outlet (19), filler opening (18) and oil outlet (19) are arranged on rear end cover (11).

7. a flow control method for plunger pump as claimed in claim 1, is characterized in that: be in by combination the plunger exporting operating mode and realize that zero delivery exports, full flow exports and combined flow exports three kinds of way of outputs,

When zero delivery exports, when inner plunger (2) and outer plunger (3) oil suction, the first inlet switch valve (7) and the second inlet switch valve (8) are in all the time opens operating mode, and now plunger pump does not have flow to export;

When full flow exports, during pump oil suction, open whole first inlet switch valves (7) that inner plunger (2) is corresponding, open whole second inlet switch valves (8) that outer plunger (3) is corresponding, during pump oil extraction, open whole first gate out switch valves (9) that inner plunger (2) is corresponding, open whole second gate out switch valves (10) that outer plunger (3) is corresponding;

When combined flow exports, due to inner plunger (2), the pitch circle diameter of outer plunger (3) is different, therefore its inner plunger (2) is not identical with the output flow of outer plunger (3) correspondence yet, first inner plunger number n1 and the outer plunger number n2 of oil extraction is determined, the inner plunger number carrying out the output of fluid flow is not now needed to be m1-n1 in plunger pump, wherein m1 be inner plunger sum, do not need the outer plunger number carrying out the output of fluid flow be m2-n2 wherein m2 be outer plunger sum, when plunger pump oil suction, open whole first inlet switch valve (7) and the second inlet switch valve (8), during plunger pump oil extraction, the the first gate out switch valve (9) opened for n1 inner plunger cavity volume of flow output is corresponding makes pump oil extraction, remain the first inlet switch valve (7) that m1-n1 inner plunger then opens its correspondence, the the second gate out switch valve (10) simultaneously opened for n2 outer plunger cavity volume of flow output is corresponding makes pump oil extraction, remain the second inlet switch valve (8) that m2-n2 outer plunger then opens its correspondence, inside and outside plunger cavity inner fluid is made to pass back into pump filler opening with the output flow of this pilot plunger pump.