CN110848126B

CN110848126B - Plunger type digital pump

Info

Publication number: CN110848126B
Application number: CN201911186068.2A
Authority: CN
Inventors: 李少年; 王煜; 常露丹; 李毅; 代鹏云
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2019-11-28
Filing date: 2019-11-28
Publication date: 2020-12-25
Anticipated expiration: 2039-11-28
Also published as: CN110848126A

Abstract

A plunger type digital pump mainly comprises a flow distribution end cover, a shell, a low-pressure valve body, a high-pressure valve body, a cylinder body, a roller plunger, a flow distribution slideway, a sleeve, an output shaft, a bearing and an end cover; the cylinder body is formed by superposing five parts, a roller plunger is arranged in the fifth cylinder body, the fourth cylinder body divides a plunger cavity into an oil suction channel and an oil pressing channel, the first cylinder body and the third cylinder body are internally embedded with the second cylinder body, low-pressure valve bodies and high-pressure valve bodies are uniformly arranged at intervals in the circumferential direction, and valve core controllers are uniformly arranged at intervals in the circumferential direction of the second cylinder body; a first flow distribution slideway, a second flow distribution slideway and a third flow distribution slideway are fixedly arranged on the output shaft, a first rectifying valve seat and a high-speed valve core are embedded in the low-pressure valve body, the closing control can be carried out through an electric signal, and a second rectifying valve seat and a valve core are embedded in the high-pressure valve body; through adjusting the working state and the sequence of the valve cores in each low-pressure valve body, the discrete control of the flow can be realized, and further the variable control of the output flow of the plunger pump can be realized.

Description

Plunger type digital pump

Technical Field

The invention relates to an axial plunger type hydraulic pump, in particular to an axial plunger type digital hydraulic pump.

Background

Plunger pumps are widely applied in the hydraulic field, variable mechanisms are added on the basis of quantitative plunger pumps in order to realize the adjustment of output displacement, the variable mechanisms are mainly swash plate mechanisms, and the variable mechanisms are complex and have poor reliability, so that the weight and the volume of unit power of the variable mechanisms are larger. A great deal of research is currently being conducted on the displacement adjustment of plunger pumps, mainly based on incremental digital control, such as a digital pump with the grant CN201510658229.9, in which the plunger is driven by an eccentric shaft collar and displacement pulse width modulation is achieved by a high-speed switching valve. The structure has the following defects that the plungers are radially arranged, and the number of the high-speed switch valves is the same as that of the plungers, so that the structure is complex and not compact enough, and the overall dimension is large; the rated displacement range is smaller under the control of the size of the eccentric shaft sleeve, and the rated displacement can be improved only by increasing the quantity of plungers and high-speed switching valves on the structure; in addition, the control oil path is more complex along with the increase of the number of the plungers, so that the throttling loss is serious and the mechanical efficiency is reduced.

Disclosure of Invention

The invention aims to provide a novel plunger type digital pump. The control of output flow is realized by controlling the embedded high-low pressure valve body.

The invention relates to a plunger type digital pump, which comprises a flow distribution end cover 5, a shell 1, a low-pressure valve body, a high-pressure valve body, a first cylinder body 6, a second cylinder body 8, a third cylinder body 11, a fourth cylinder body 14, a fifth cylinder body 15, a roller plunger, a first flow distribution slide way 17, a second flow distribution slide way 29, a third flow distribution slide way 33, a first sleeve 18, a second sleeve 35, an output shaft 26, a first bearing 23, a second bearing 24 and an end cover 22, wherein the roller plunger is arranged in the fifth cylinder body 15, a plunger cavity is divided into an oil suction channel and an oil pressing channel by the fourth cylinder body 14, the second cylinder body 8, the low-pressure valve body and the high-pressure valve body are embedded in the first cylinder body 6 and the

third cylinder body

11, and 9 valve core controllers 42 are embedded in the second; the output shaft 26 is provided with a second distribution slide way 29 and a third distribution slide way 33, and a first distribution slide way 17 is fixed through a sleeve; the low-pressure valve body mainly comprises a first rectifier valve body 38, a second rectifier valve body 41, a coil 39, a permanent magnet 40 and a low-pressure valve core 36, the low-pressure valve core 36 can be controlled to be closed through an electric signal, and a third rectifier valve seat 43 and a high-pressure valve core 45 are embedded in the high-pressure valve body.

The invention has the advantages that: the hydraulic system has the advantages of sensitive control, compact structure, low noise, no external leakage, lower manufacturing and maintenance cost, more convenient installation and maintenance, wider application range and capability of improving the efficiency of the hydraulic system. The element can meet the requirements of working environment and has a wide application prospect.

Drawings

Fig. 1 is a schematic structural view of the present invention, fig. 2 is a schematic structural view of a low pressure valve body of the present invention, fig. 3 is a schematic structural view of a high pressure valve body of the present invention, and fig. 4 is a schematic mounting view of the low pressure valve body and the high pressure valve body of the present invention. Reference numerals and corresponding names: 1-housing, 2-first gasket, 3-first pipe joint, 4-first O-ring, 5-distribution end cap, 6-first cylinder, 7-main controller, 8-second cylinder, 9-second pipe joint, 10-second O-ring, 11-third cylinder, 12-first spring gasket, 13-first screw, 14-fourth cylinder, 15-fifth cylinder, 16-second screw, 17-first distribution slide, 18-first sleeve, 19-third screw, 20-second gasket, 21-second spring gasket, 22-end cap, 23-first bearing, 24-second bearing, 25-seal ring, 26-output shaft, 27-fourth screw, 28-fifth screw, 29-a second distribution slide way, 30-a roller, 31-a pin, 32-a plunger, 33-a third distribution slide way 34-a first spring, 35-a second sleeve, 36-a low-pressure valve core, 37-a snap spring, 38-a first rectifier valve body, 39-a coil, 40-a permanent magnet, 41-a second rectifier valve body, 42-a valve core controller, 43-a third rectifier valve body, 44-a second spring and 45-a high-pressure valve core.

Detailed Description

As shown in fig. 1 to 4, the invention is a plunger-type digital pump, which comprises a flow distribution end cover 5, a shell 1, a low-pressure valve body, a high-pressure valve body, a first cylinder 6, a second cylinder 8, a third cylinder 11, a fourth cylinder 14, a fifth cylinder 15, a roller plunger, a first flow distribution slideway 17, a second flow distribution slideway 29, a third flow distribution slideway 33, a first sleeve 18, a second sleeve 35, an output shaft 26, a first bearing 23, a second bearing 24 and an end cover 22, wherein the roller plunger is installed in the fifth cylinder 15, a plunger cavity is divided into an oil suction channel and a pressure oil channel by the fourth cylinder 14, the second cylinder 8, the low-pressure valve body and the high-pressure valve body are embedded in the first cylinder 6 and the

third cylinder

11, and 9 valve core controllers 42 are embedded in the second cylinder 8; the output shaft 26 is provided with a second distribution slide way 29 and a third distribution slide way 33, and a first distribution slide way 17 is fixed through a sleeve; the low-pressure valve body mainly comprises a first rectifier valve body 38, a second rectifier valve body 41, a coil 39, a permanent magnet 40 and a low-pressure valve core 45, can be controlled to be closed through an electric signal, and is internally embedded with a third rectifier valve seat 43 and a high-pressure valve core 45.

As shown in fig. 1 and 4, the cylinder of the plunger type digital pump is composed of a first cylinder 6, a second cylinder 8, a third cylinder 11, a fourth cylinder 14 and a fifth cylinder 15, the five cylinders are installed in a shell 1 and fixed through an end cover 22 and a flow distribution end cover 5, and low-pressure valves and high-pressure valves are embedded in the first cylinder and the second cylinder at uniform intervals in the circumferential direction.

As shown in FIG. 1, a roller 30 in the roller plunger is mounted on a plunger 32 through a pin 31, the plunger 32 is mounted in cooperation with the fifth cylinder 15, and the roller 30 is mounted among the first distribution chute 17, the second distribution chute 29 and the third distribution chute 33 and can move relative to the distribution chutes.

As shown in fig. 2 and 3, the low-pressure valve body is composed of a first rectifier valve body 38, a second rectifier valve body 41, a coil 39, a permanent magnet 40 and a low-pressure valve core 45, the low-pressure valve core 36 can be controlled to be closed through an electric signal, and a third rectifier valve seat 43 and a high-pressure valve core 45 are embedded in the high-pressure valve body; the flow state of oil in the plunger cavity can be improved by the rectifier valve seat, and meanwhile, the closing control is carried out through an electric signal.

Full flow output, wherein 9 low-pressure valve bodies are realized by the main controller to obtain control signals, all the low-pressure valve bodies are in a working state, and the plunger pumps oil through the oil suction passage and discharges the oil through the oil pressing passage; the output of combined working conditions is realized, N low-pressure valve bodies are controlled by a main controller to obtain control signals, the number of working plungers is N, and plunger cavities of the remaining 9-N plungers are communicated with an oil tank all the time and are in an unloading state; zero flow output, wherein 9 low-pressure valve bodies are realized by a main controller without control signals, and the number of working plungers is 0; all the plungers are communicated with the oil tank through the oil suction channels all the time and are in an unloading state, and at the moment, the plunger pump does not output flow.

The present invention will be further described with reference to the accompanying drawings, which should not be construed as limiting the invention.

As shown in fig. 4: the figure is a schematic view of the installation of the high pressure valve body and the low pressure valve body of the present invention.

The invention has the following matching: the 1-shell, the 2-first gasket and the 5-flow distribution end cover are hermetically installed through a 13-first screw and a 12-first spring gasket, a 9-second hydraulic pipe joint is installed on the 5-flow distribution end cover through a 10-second O-shaped sealing ring, a 6-first cylinder body, an 8-second cylinder body, an 11-third cylinder body, a 14-fourth cylinder body and a 15-fifth cylinder body are installed in the 1-shell from bottom to top in a split mode, 9 36-low-pressure valve cores are embedded in the 6-first cylinder body and the 8-second cylinder body at uniform intervals in the circumferential direction, and 9 45-high-pressure valve cores are embedded in the 6-first cylinder body and the 11-third cylinder body at uniform intervals in the circumferential direction. 7-the main controller is installed on a 5-flow distribution end cover through threads, 1-a shell, 20-a second gasket, 22-an end cover and realizes sealing installation through 19-a third screw and 21-a second spring gasket, 17-a first flow distribution slide way and 18-a first sleeve are fixedly installed through 16-a second screw, 26-an output shaft and 33-a third flow distribution slide way realize fixed installation through 27-a fourth screw, 26-an output shaft, 29-a second flow distribution slide way and 18-a first sleeve realize fixed installation through 28-a fifth screw, 30-a roller and a 32-plunger are installed together through 31-a pin, the outer ring of a first bearing 23 is installed with a fifth cylinder body 15 in a matching mode, and the inner ring of the first bearing 23 is installed with the output shaft 26 in a matching mode; the outer ring of a second bearing 24 is installed in a matched mode with an end cover 22, the inner ring of the second bearing 24 is installed in a matched mode with an output shaft 26, the end cover 22 and the output shaft 26 are sealed through a 25-sealing ring, a low-pressure valve core 36 is provided with a clamp spring 37, a second sleeve 35 is installed on a low-pressure valve core 36 through a clamp spring 37 and a first spring 34, a permanent magnet 40 is fixedly installed at the tail end of the low-pressure valve core 36, a coil 39 is installed in a second rectifier valve body 41 in an embedded mode, a first rectifier valve body 38 is embedded in a first cylinder body 6, a second rectifier valve body 41 is embedded in a second cylinder body 11, a valve core 42 controller is embedded in a second cylinder body 8, and a high-pressure valve body is composed of a high-pressure valve core 45, a, 44-the second spring, 43-the third rectifier valve body is embedded in the 6-the first cylinder body.

The working process of the invention is as follows: the single plunger control case is as follows:

1. under the condition of no control signal, the low-pressure valve body is in an initial state, the oil suction channel is communicated with the oil tank, and the plunger is in an unloading state at the moment.

2. Under the condition of a control signal, when the plunger absorbs oil, the low-pressure valve body does not have an electric signal and is in an initial state, the oil absorption channel is communicated with the oil tank, namely oil is supplemented through the oil absorption cavity; when the plunger discharges oil, the low-pressure valve body has an electric signal, the valve core overcomes the spring force to close the oil suction channel and the oil tank, the high-pressure valve body is opened under the action of high-pressure oil, and the oil is discharged through the oil pressing channel to realize work.

The multi-plunger combined control comprises the following steps:

and (3) outputting the full flow: the main controller enables 9 low-pressure valve bodies to obtain control signals, the number of the working plungers is 9 at the moment, the 9 plungers have control signals at the same time, the low-pressure valve bodies are in a working state, the plungers supplement oil through oil absorption channels, when the plungers discharge oil, the low-pressure valve cores are closed, high-pressure oil is discharged through oil pressing channels, and the plunger pump achieves a maximum flow state at the moment.

And (3) outputting a combined working condition: the N low-pressure valve bodies are enabled to obtain control signals through the main controller, the number of the working plungers is N, the number of the plungers in an unloading state is 9-N, and plunger cavities of the remaining 9-N plungers are communicated with the oil suction channel and the oil tank all the time and are in the unloading state.

Zero flow output: the main controller enables the 9 low-pressure valve bodies to have no control signal, the number of the working plungers is 0, plunger cavities of the 9 plungers are communicated with the oil tank through the oil suction channel all the time and are in an unloading state, and the plunger pumps do not output flow at the moment.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims

1. A plunger type digital pump comprises a flow distribution end cover (5), a shell (1), a low-pressure valve body, a high-pressure valve body, a first cylinder body (6), a second cylinder body (8), a third cylinder body (11), a fourth cylinder body (14), a fifth cylinder body (15), a roller plunger, a first flow distribution slideway (17), a second flow distribution slideway (29), a third flow distribution slideway (33), a first sleeve (18), a second sleeve (35), an output shaft (26), a first bearing (23), a second bearing (24) and an end cover (22), the hydraulic control valve is characterized in that a roller plunger is installed in a fifth cylinder body (15), a fourth cylinder body (14) divides a plunger cavity into an oil suction channel and an oil pressing channel, a second cylinder body (8), a low-pressure valve body and a high-pressure valve body are embedded in a first cylinder body (6) and a third cylinder body (11), and 9 valve core controllers (42) are embedded in the second cylinder body (8); a second flow distribution slide way (29) and a third flow distribution slide way (33) are arranged on the output shaft (26), and a first flow distribution slide way (17) is fixed through a first sleeve (18); the low-pressure valve body mainly comprises a first rectifier valve body (38), a second rectifier valve body (41), a coil (39), a permanent magnet (40) and a low-pressure valve core (36), and a third rectifier valve seat (43) and a high-pressure valve core (45) are embedded in the high-pressure valve body.

2. The plunger-type digital pump as set forth in claim 1, wherein: the plunger type digital pump cylinder body is composed of a first cylinder body (6), a second cylinder body (8), a third cylinder body (11), a fourth cylinder body (14) and a fifth cylinder body (15), the five cylinder bodies are installed in the shell (1) and fixed through an end cover (22) and a flow distribution end cover (5), and low-pressure valve bodies and high-pressure valve bodies are embedded in the first cylinder body and the second cylinder body at uniform intervals in the circumferential direction.

3. The plunger-type digital pump as set forth in claim 1, wherein: the roller plunger middle roller (30) is installed on the plunger (32) through a pin (31), the plunger (32) and the fifth cylinder body (15) are installed in a matched mode, the roller (30) is installed among the first flow distribution slide way (17), the second flow distribution slide way (29) and the third flow distribution slide way (33), and relative movement with the flow distribution slide ways can be achieved.

4. The plunger-type digital pump as set forth in claim 1, wherein: the low-pressure valve body consists of a first rectifier valve body (38), a second rectifier valve body (41), a coil (39), a permanent magnet (40) and a low-pressure valve core (36), the low-pressure valve core (36) can be controlled to be closed through an electric signal, and a third rectifier valve seat (43) and a high-pressure valve core (45) are embedded in the high-pressure valve body; the third rectifier valve seat can improve the flowing state of oil in the plunger cavity.