CN119267140A - A variable device, control method and plunger pump - Google Patents
A variable device, control method and plunger pump Download PDFInfo
- Publication number
- CN119267140A CN119267140A CN202411579262.8A CN202411579262A CN119267140A CN 119267140 A CN119267140 A CN 119267140A CN 202411579262 A CN202411579262 A CN 202411579262A CN 119267140 A CN119267140 A CN 119267140A
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- China
- Prior art keywords
- variable
- oil
- piston
- oil sump
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000006073 displacement reaction Methods 0.000 claims description 25
- 239000012530 fluid Substances 0.000 claims description 3
- 230000003247 decreasing effect Effects 0.000 claims 1
- 239000003921 oil Substances 0.000 description 92
- 230000001276 controlling effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
- F04B1/30—Control of machines or pumps with rotary cylinder blocks
- F04B1/32—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block
- F04B1/324—Control of machines or pumps with rotary cylinder blocks by varying the relative positions of a swash plate and a cylinder block by changing the inclination of the swash plate
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a variable device, a control method and a plunger pump, wherein an electric driving device drives a variable piston to move to adjust the angle of a swash plate, a hydraulic valve and a return spring in the existing device are abandoned, the control stability is better, the response time is short, the whole structure is simple, and the cost is low.
Description
Technical Field
The invention relates to a variable device, a control method and a plunger pump, and belongs to the field of hydraulic pumps.
Background
With the development trend of miniaturization and structural simplification of plunger pumps, in recent years, plunger pump products with smaller volumes have appeared, and particularly miniaturization designs for variable devices have been performed. Referring to fig. 1, the structure redesigns a variable device based on a conventional constant power control mode of a plunger pump, and changes a swash plate by controlling hydraulic oil to flow into or out of a variable piston 1 through a control valve, thereby changing pump displacement. In the variable device, one side of a swash plate is contacted with a variable piston 1, the other side of the swash plate is contacted with a return spring 2, and the return stroke of the swash plate, namely the process of changing the swash plate from 0 displacement to large displacement, mainly depends on spring force. The structure is determined by 1) the valve clamping phenomenon is easy to occur due to the adoption of hydraulic valve control, the control stability is poor, 2) the structure is complex, the processing difficulty is high, the cost is high, 3) the variable response time is long due to the fact that a swash plate is a return spring 2 return stroke, 4) the spring force is small, the area of a variable piston 1 is large, the pressure behind the valve is low, the control structure is easily influenced by the outlet pressure and the return oil pressure, and the control stability is poor.
Disclosure of Invention
The invention provides a variable device, a control method and a plunger pump, which solve the problems disclosed in the background art.
According to one aspect of the present disclosure, there is provided a variable displacement device comprising a variable displacement piston disposed in a piston bore of a pump housing, the variable displacement piston being rotatably connected to a swash plate at one end of the variable displacement piston facing the interior of the pump housing, and an electric drive device being connected to one end of the variable displacement piston facing the exterior of the pump housing.
In some embodiments of the present disclosure, an oil sump is formed between the variable piston and the piston bore, the oil sump is externally connected with an oil supply port and an oil return cavity, the variable piston moves towards the inner cavity of the pump housing, the volume of the oil sump becomes large, the variable piston moves towards the outside of the pump housing, and the volume of the oil sump becomes small.
In some embodiments of the present disclosure, the oil sump is externally connected to the oil supply port through an electronic control device, wherein the electronic control device controls the pressure of the fluid between the oil sump and the oil supply port.
In some embodiments of the present disclosure, the electric drive is a motor driven lead screw, a moving mass of the lead screw being connected to the variable displacement piston.
In some embodiments of the present disclosure, the electric drive device includes a motor, an output end of the motor is connected to a screw, and a screw hole is provided at an end of the variable piston facing the outside of the pump housing, and the screw is screwed into the screw hole.
According to another aspect of the present disclosure, there is provided a control method of a variable device, the variable device being the variable device described above, the control method including:
Controlling an electric driving device to drive a variable piston to move towards the outside of the pump shell in response to the need of adjusting the angle of the swash plate;
in response to a need to increase the swash plate angle, the electric drive is controlled to drive the variable piston to move toward the inner cavity of the pump housing.
In some embodiments of the present disclosure, if the variable device comprises an oil sump and the oil sump is externally connected to the oil supply port through the electronic control device;
if the variable device comprises an oil pool, the oil pool is externally connected with an oil supply port and an oil return cavity through an electric control device;
in response to the need of increasing the angle of the sloping cam plate, controlling an electric control device between the oil sump and the oil supply port to be opened, closing the electric control device between the oil sump and the oil return cavity, and controlling an electric driving device to drive the variable piston to move towards the inner cavity of the pump shell;
And in response to the need of adjusting the angle of the swash plate to be small, controlling an electric control device between the oil sump and the oil supply port to be closed, opening the electric control device between the oil sump and the oil return cavity, and controlling the electric drive device to drive the variable piston to move towards the outside of the pump shell.
According to another aspect of the present disclosure, there is provided a plunger pump characterized by comprising the variable displacement device described above.
In some embodiments of the present disclosure, if the variable device includes an oil sump and the plunger pump is rotated in only one direction, an oil drain port of a port plate of the plunger pump is connected to the oil sump.
In some embodiments of the present disclosure, if the variable device includes an oil sump and the plunger pump rotates bi-directionally, the oil ports of the port plate of the plunger pump are all connected to the oil sump through a shuttle valve.
The invention has the beneficial effects that the variable piston is driven by the electric driving device to move to adjust the angle of the swash plate, the hydraulic valve and the return spring in the existing device are abandoned, the control stability is better, the response time is short, the whole structure is simple, and the cost is low.
Drawings
FIG. 1 is a schematic diagram of a conventional plunger pump;
FIG. 2 is a schematic diagram of a variable device of the present invention;
FIG. 3 is a schematic view of a first construction of a plunger pump according to the present invention;
FIG. 4 is a schematic view of a second construction of the plunger pump of the present invention;
fig. 5 is a schematic view of a third construction of the plunger pump of the present invention.
Detailed Description
The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless it is otherwise stated.
Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description.
Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that like symbols and letters represent like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In order to solve the problems of a variable device in an existing plunger pump, the disclosure provides a variable device, a control method and a plunger pump.
Fig. 2 is a schematic diagram of an embodiment of a variable displacement device of the present disclosure, which may specifically include a variable displacement piston 1 embedded in a piston hole 4 of a pump housing 9, where the variable displacement piston 1 is rotatably connected to a swash plate 3 toward one end of the inner cavity of the pump housing 9, and where the variable displacement piston 1 is connected to an electric drive device toward one end of the variable displacement piston facing the outer side of the pump housing 9.
The piston hole 4 is inclined at an angle of about 30 degrees, and may be divided into two coaxial sections, and the aperture near one section of the swash plate 3 is larger than the aperture at the other end. The variable piston 1 is matched with the piston hole 4, and can be divided into two sections, namely a thick section and a thin section, wherein the thick section can only move in the big hole.
In order to ensure smooth rotation of the swash plate 3, a positioning pin may be used to realize rotational connection between the variable piston 1 and the swash plate 3.
It should be noted that the structure of the electric driving device may be various, such as an electric cylinder, and the telescopic end of the electric cylinder is directly connected to the variable piston 1. However, in order to make the control more stable, in some embodiments, the electric driving device may use a screw driven by the motor 6, a mounting seat may be fixed at the outward end of the piston hole 4, the screw and the motor 6 are mounted on the mounting seat, a moving block of the screw is directly connected to the variable piston 1, and the motor 6 drives the screw to drive the variable piston 1 to move along the piston hole 4.
In some embodiments, the electric driving device may further include a screw 7 driven by the motor 6, which may specifically include the motor 6 and the screw 7, similar to a screw, and a mounting seat may be fixed at an outward end of the piston hole 4, where the motor 6 is mounted on the mounting seat, an output end of the motor 6 is connected to the screw 7, and an end of the variable piston 1 facing the pump housing 9 is provided with a screw hole 8, or a positioning pin is mounted with a nut, the screw 7 is screwed into the screw hole 8, the motor 6 drives the screw 7 to rotate, and the screw hole 8 drives the variable piston 1 to move along the piston hole 4.
It should be noted that, in order to miniaturize the device, it is necessary to use as small an electric drive device (i.e. the motor 6) as possible, while the small motor 6 can only output a small thrust force, so that in order to enhance the thrust force to the swash plate 3, an auxiliary device, in particular an oil sump 5 between the variable piston 1 and the piston bore 4, is provided in some embodiments.
In fig. 2, with the movement of the piston, the thin section of the piston will enter the large hole, and at this time, a space, i.e. an oil pool 5, will be formed between the inner wall of the large hole, the thin section of the piston and the thick section of the piston, when the variable piston 1 moves towards the inner cavity of the pump housing 9, the volume of the oil pool 5 will become large, when the variable piston 1 moves towards the outside of the pump housing 9, the volume of the oil pool 5 will become small, the oil pool 5 is externally connected with an oil supply port and an oil return cavity (not shown in the figure) in the pump housing 9, and by inputting pressure oil into the oil pool 5, the auxiliary driving variable piston 1 moves towards the inner cavity of the pump housing 9, otherwise, by outputting pressure oil to the oil pool 5, the auxiliary driving variable piston 1 moves towards the outside of the pump housing 9. The oil sump 5, in combination with the pressurized oil, can assist the electric drive in accomplishing a variable motion, which results in a reduced thrust of the electric drive, contributing to a reduced electric drive size.
It should be noted that, in order to make the control more stable, in some embodiments, an electric control device may be installed between the oil sump 5 and the oil supply port and between the oil sump 5 and the oil return cavity, where the electric control device between the oil sump 5 and the oil supply port is used to control the pressure of the fluid between the oil sump 5 and the oil supply port, specifically, the electromagnetic proportional valve 17 may be adopted, and the electric control device between the oil sump 5 and the oil return cavity is mainly used to control the on-off of the oil path, and may be a simple electric control valve.
It should be noted that, since the driving and the like are all electrically controlled, the unified control can be performed by one controller, and the specific control method can be as follows:
when the variable piston 1 is driven by the electric drive device only:
the electric driving device is controlled to drive the variable piston 1 to move towards the outside of the pump housing 9 in response to the need of adjusting the angle of the swash plate 3, and the electric driving device is controlled to drive the variable piston 1 to move towards the inner cavity of the pump housing 9 in response to the need of adjusting the angle of the swash plate 3.
When the variable piston 1 is driven by an electric driving device and an electric control device:
In response to the need of adjusting the angle of the sloping cam plate 3, the electric control device between the oil sump 5 and the oil supply port is controlled to be opened, the electric control device between the oil sump 5 and the oil return cavity is closed, the electric drive device is controlled to drive the variable piston 1 to move towards the inner cavity of the pump shell 9, in response to the need of adjusting the angle of the sloping cam plate 3, the electric control device between the oil sump 5 and the oil supply port is controlled to be closed, the electric control device between the oil sump 5 and the oil return cavity is opened, and the electric drive device is controlled to drive the variable piston 1 to move towards the outside of the pump shell 9.
Taking the same controller as an example for controlling the motor 6 and the electromagnetic proportional valve 17, the motor 6 receives proportional signals, and when the pressure of the electromagnetic proportional valve 17 is set, the pump variable works, the motor receives on-off signals sent by the controller, and the two signals are cooperatively controlled to finish variable actions:
When a positive signal is output to the motor 6, so that the swash plate rotates to a large angle, at the same time, the electromagnetic proportional valve 17 is connected with the signal, the oil way from the oil drain port of the pump to the oil sump 5 is opened, and meanwhile, the oil way from the oil sump 5 to the oil return cavity of the shell is cut off, so that the swash plate is pushed to rotate to a large angle by the auxiliary variable piston. When a negative signal is output to the motor 6, so that the swash plate rotates to a small angle, at the same time, the electromagnetic proportional valve 17 cuts off the signal, cuts off the oil path from the oil drain port of the pump to the oil sump 5, and simultaneously opens the oil path from the oil sump 5 to the oil return cavity of the shell, so that the variable piston pulls the swash plate to rotate to a small angle.
According to the device, the variable piston 1 is driven by the electric driving device to move to adjust the angle of the swash plate 3, so that a hydraulic valve and a return spring in the existing device are abandoned, meanwhile, an auxiliary device is electrically controlled, the control stability is better, the response time is short, the whole structure is simple, and the cost is low.
Fig. 3 is a schematic diagram of an embodiment of a plunger pump of the present disclosure, specifically including the variable displacement device described above.
It should be noted that other structures of the plunger pump are common structures, including a rear cover 10 fixed to the pump housing 9, where a valve plate 14 is installed on a side of the rear cover 10 facing the inner cavity, and the valve plate 14 has opposite arc-shaped oil ports, which are defined as a first arc-shaped oil port 13 and a second arc-shaped oil port 15.
Referring to fig. 4, if the plunger pump rotates only in one direction, the first arc-shaped oil port 13 is an oil drain port, the second arc-shaped oil port 15 is an oil suction port, and the first arc-shaped oil port 13 is connected with the oil sump 5 through the electromagnetic proportional valve 17.
Referring to fig. 5, if the plunger pump rotates bidirectionally, the oil ports of the valve plate 14 are all connected with the oil pool 5 through the shuttle valve 18, namely, the first arc-shaped oil port 13 and the second arc-shaped oil port 15 can be connected by using the shuttle valve 18, and no matter which oil port is high-pressure, high-pressure side pressure oil can be introduced into the electromagnetic proportional valve 17 through the shuttle valve 18 and finally reaches the oil pool 5.
The electromagnetic proportional valve 17 is arranged to reduce the pump outlet pressure to a set pressure, and in specific implementation, the output pressure of the electromagnetic proportional valve 17 can be positively correlated with the input signal or negatively correlated with the input signal.
It should be noted that the pump housing 9 includes an outer wall (i.e., 16 in fig. 3) at an angle (i.e., 30 degrees) to the axial direction, and the piston hole 4 is opened in the outer wall. The swash plate 3 is supported by a semicircular rail 11 formed in the pump housing 9, and one end of the swash plate 3 remote from the variable piston 1 is rotatably connected by a plunger 12 so that the swash plate 3 can move around the semicircular rail 11.
According to the plunger pump, the variable piston 1 is driven by the electric driving device to move so as to adjust the angle of the swash plate 3, a hydraulic valve and a return spring in the conventional device are abandoned, meanwhile, the auxiliary device is electrically controlled, the control stability is better, the response time is short, the whole structure is simple, and the cost is low.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. The variable device is characterized by comprising a variable piston arranged in a piston hole of a pump shell, wherein one end of the variable piston, which faces towards the inner cavity of the pump shell, is connected with a swash plate in a rotating way, and one end of the variable piston, which faces towards the outer part of the pump shell, is connected with an electric driving device.
2. The variable displacement device of claim 1, wherein an oil sump is formed between the variable displacement piston and the piston bore, the oil sump being circumscribed by the oil supply port and the oil return chamber, the variable displacement piston moving toward the pump housing interior chamber, the volume of the oil sump being increased, the variable displacement piston moving toward the pump housing exterior, the volume of the oil sump being decreased.
3. The variable device of claim 2, wherein the oil sump is externally connected to the oil supply port via an electronic control device, and wherein the electronic control device controls the pressure of the fluid between the oil sump and the oil supply port.
4. A variable displacement device according to claim 1, wherein the electric drive means is a motor driven screw, the moving mass of which is connected to the variable displacement piston.
5. The variable displacement device according to claim 1, wherein the electric driving device comprises a motor, an output end of the motor is connected with a screw, and a screw hole is formed in one end of the variable displacement piston, which faces the outside of the pump shell, and the screw is screwed into the screw hole.
6. A control method of a variable device, wherein the variable device is the variable device according to any one of claims 1 to 5, the control method comprising:
Controlling an electric driving device to drive a variable piston to move towards the outside of the pump shell in response to the need of adjusting the angle of the swash plate;
in response to a need to increase the swash plate angle, the electric drive is controlled to drive the variable piston to move toward the inner cavity of the pump housing.
7. The control method of the variable device according to claim 6, wherein if the variable device includes an oil pool and the oil pool is externally connected with the oil supply port and the oil return cavity through the electric control device;
in response to the need of increasing the angle of the sloping cam plate, controlling an electric control device between the oil sump and the oil supply port to be opened, closing the electric control device between the oil sump and the oil return cavity, and controlling an electric driving device to drive the variable piston to move towards the inner cavity of the pump shell;
And in response to the need of adjusting the angle of the swash plate to be small, controlling an electric control device between the oil sump and the oil supply port to be closed, opening the electric control device between the oil sump and the oil return cavity, and controlling the electric drive device to drive the variable piston to move towards the outside of the pump shell.
8. A plunger pump comprising the variable displacement device according to any one of claims 1 to 5.
9. The plunger pump of claim 8, wherein the oil drain port of the port plate of the plunger pump is connected to the oil sump if the variable device comprises the oil sump and the plunger pump is rotated in only one direction.
10. The plunger pump of claim 8, wherein if the variable device comprises an oil sump and the plunger pump is rotated bi-directionally, the ports of the port plate of the plunger pump are all connected to the oil sump through a shuttle valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411579262.8A CN119267140A (en) | 2024-11-06 | 2024-11-06 | A variable device, control method and plunger pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411579262.8A CN119267140A (en) | 2024-11-06 | 2024-11-06 | A variable device, control method and plunger pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN119267140A true CN119267140A (en) | 2025-01-07 |
Family
ID=94123160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202411579262.8A Pending CN119267140A (en) | 2024-11-06 | 2024-11-06 | A variable device, control method and plunger pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN119267140A (en) |
-
2024
- 2024-11-06 CN CN202411579262.8A patent/CN119267140A/en active Pending
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