CN113236616B - Proportional variable pump control device and control method thereof - Google Patents
Proportional variable pump control device and control method thereof Download PDFInfo
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- CN113236616B CN113236616B CN202110580601.4A CN202110580601A CN113236616B CN 113236616 B CN113236616 B CN 113236616B CN 202110580601 A CN202110580601 A CN 202110580601A CN 113236616 B CN113236616 B CN 113236616B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/024—Pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/08—Servomotor systems incorporating electrically operated control means
Abstract
The invention relates to a proportional variable pump control device and a control method thereof, and the proportional variable pump control device comprises a constant pressure variable plunger pump and a proportional pressure regulating mechanism, wherein the proportional pressure regulating mechanism comprises a valve/pump control switching valve, a pilot proportional overflow valve, a valve control overflow valve and a pressure detection mechanism, the pressure detection mechanism is used for detecting the output pressure of a loop of the proportional variable pump control device and feeding the output pressure back to an electric control system, the valve/pump control switching valve is used for switching the control loop of the pilot proportional overflow valve, so that the proportional variable pump control device is in a pump control state or a valve control state, and when the proportional variable pump control device is switched to the pump control state, the pilot proportional overflow valve controls the pilot oil pressure of the constant pressure variable plunger pump to ensure that the constant pressure variable plunger pump automatically changes when reaching the set pressure; when the proportional variable pump is switched to the valve control state, the pilot proportional overflow valve controls the pilot oil pressure of the valve control overflow valve and adjusts the output pressure of the proportional variable pump control device. The invention can select the corresponding mode according to the requirement of the equipment on the output flow, and achieves the aim of saving energy while realizing the performance requirement.
Description
Technical Field
The invention relates to the field of hydraulic transmission, in particular to a proportional variable pump control device and a control method thereof.
Background
The plunger pump is an important device of the hydraulic system. The plunger reciprocates in the cylinder body to change the volume of the sealed working cavity so as to absorb and press oil. The plunger pump has the advantages of high rated pressure, compact structure, high efficiency, convenient flow regulation and the like, and is widely applied to occasions with high pressure, large flow and flow needing regulation, such as hydraulic machines, engineering machinery and ships.
The existing plunger pump comprises a constant-pressure variable plunger pump and a proportional plunger pump, the constant-pressure variable plunger pump can only realize the interconversion between low-pressure large flow and high-pressure small flow, and can not select corresponding proportional control according to the requirements of equipment on output flow and pressure, the proportional plunger pump can adjust the pressure and flow of a system, but the cost of the proportional plunger pump is higher.
Disclosure of Invention
The invention designs a proportional variable pump control device and a control method thereof, and solves the technical problems that the conventional plunger pump comprises a constant-pressure variable plunger pump and a proportional plunger pump, the constant-pressure variable plunger pump can only realize the interconversion between low-pressure large flow and high-pressure small flow, the corresponding proportional control cannot be selected according to the requirements of equipment on output flow and pressure, the proportional plunger pump can adjust the pressure and flow of a system, but the cost of the proportional plunger pump is higher.
In order to solve the technical problems, the invention adopts the following scheme:
a proportional variable pump control device comprises a constant pressure variable plunger pump, wherein the constant pressure variable plunger pump is connected with a proportional pressure regulating mechanism, the proportional pressure regulating mechanism comprises a valve/pump control switching valve, a pilot proportional overflow valve, a valve control overflow valve and a pressure detection mechanism, the pressure detection mechanism is used for detecting the output pressure of a loop of the proportional variable pump control device and feeding the output pressure back to an electric control system, the valve/pump control switching valve is used for switching the control loop of the pilot proportional overflow valve, so that the proportional variable pump control device is in a pump control state or a valve control state, and when the proportional variable pump control device is switched to the pump control state, the pilot proportional overflow valve controls the pilot oil pressure of the constant pressure variable plunger pump to enable the constant pressure variable plunger pump to be automatically variable when the set pressure is reached; when the proportional variable pump is switched to the valve control state, the pilot proportional overflow valve controls the pilot oil pressure of the valve control overflow valve and adjusts the output pressure of the proportional variable pump control device.
Further, when the pump control state is switched, the constant pressure variable plunger pump outputs full flow before the proportional variable pump control device reaches the preset pressure value of the pilot proportional overflow valve, and outputs the minimum flow of the automatic variable after the proportional variable pump control device reaches the preset pressure value of the pilot proportional overflow valve, so that the power is reduced.
Further, when the pump control state is switched, the valve control overflow valve acts as a safety valve to prevent the high pressure overload of the proportional variable pump control device.
Further, when the valve control state is switched, the output flow of the constant-pressure variable plunger pump is constant, and the output pressure is subjected to closed-loop control through a feedback signal of the pressure detection mechanism, so that proportional pressure adjustment is realized.
Further, the pressure detection mechanism is a pressure sensor.
Furthermore, a filter is arranged between the constant-pressure variable plunger pump and the proportional pressure regulating mechanism and used for filtering oil liquid in a loop of the proportional variable pump control device and protecting a hydraulic element.
Further, the proportional pressure regulating mechanism further comprises a pressure relief valve for pressure unloading of the proportional variable pump control device.
And the energy accumulator is used for absorbing the hydraulic pulse and maintaining the output pressure of the proportional variable pump control device to be stable.
Further, an equipment outer cover is arranged on the outer side of the proportional variable pump control device, an electric control system, an oil tank device and a cooling circulation system are arranged in the equipment outer cover, and the constant-pressure variable plunger pump is a constant-pressure variable plunger pump set.
A control method of a proportional variable pump is characterized by comprising the following steps:
step one, starting a motor of a constant-pressure variable plunger pump set, electrifying a pressure release valve after the motor runs stably, and starting to build pressure by a proportional variable pump control device;
selecting a pump control state, setting an output pressure value of a proportional variable pump control device, monitoring the output pressure of the proportional variable pump control device through a pressure sensor, and when the output pressure of the proportional variable pump control device reaches a set value, automatically changing a constant-pressure variable plunger pump set, reducing output power and maintaining stable pressure;
or, selecting a valve control state, setting an output pressure value of the proportional variable pump control device, monitoring the output pressure of the proportional variable pump control device through a pressure sensor, and keeping the output power and the pressure and the flow stable when the output pressure of the proportional variable pump control device reaches a set value and the constant-pressure variable plunger pump set is invariable;
and step three, after the equipment operation is finished, the pressure relief valve loses power, the proportional variable pump control device relieves pressure, and the equipment is shut down.
The proportional variable pump control device and the control method thereof have the following beneficial effects:
the proportional variable pump control device can provide proportional pressure oil source output under two working conditions for hydraulic equipment, and the pressure is controllable in real time; the control mode of the corresponding proportional pump control or proportional valve control can be selected according to the requirement of the equipment on the output flow, so that the proportional regulation of the output pressure can be realized, the variable energy saving under the constant pressure mode can be realized, the variable energy-saving hydraulic pump control system can be suitable for various complex hydraulic oil source power requirements, and the aim of saving energy can be fulfilled while the performance requirement is realized; meanwhile, the control loop of the proportional variable pump adopts a common constant-pressure variable plunger pump and a common hydraulic element to form the high-performance proportional variable plunger pump, so that the equipment cost is greatly reduced, and the proportional variable pump is economical, practical and reliable in performance.
Drawings
FIG. 1: the invention relates to a front view of a proportional pressure regulating mechanism;
FIG. 2: the invention relates to a top view of a proportional pressure regulating mechanism;
FIG. 3: the invention relates to a proportional variable pump control device;
FIG. 4: the invention discloses a side view of a proportional variable pump control device;
FIG. 5: the invention relates to a top view of a proportional variable pump control device;
FIG. 6: the invention discloses a control loop schematic diagram of a proportional variable pump control device.
Description of reference numerals:
1-oil circuit integrated block; 2, a filter; 3-a one-way valve; 4, a pressure relief valve; 5-valve/pump-controlled switching valve; 6-a pilot proportional overflow valve; 7-an accumulator; 8-valve control overflow valve; 9-a pressure sensor; 10-a temperature sensor; 11-outlet ball valve; 12-constant pressure variable plunger pump; 13-proportional pressure regulating mechanism; 14-an electronic control system; 15-equipment housing; 16-a tank device; and 17, cooling the circulating system.
Detailed Description
The invention is further described below with reference to fig. 1 to 6:
as shown in fig. 3 to 5, the proportional variable pump control device includes an equipment housing 15, and a constant-pressure variable plunger pump 12, a proportional pressure regulating mechanism 13, an electronic control system 14, an oil tank device 16, and a cooling circulation system 17 are provided in the equipment housing 15.
An operation interface of the electric control system 14 is arranged on the equipment housing 15, and the constant pressure variable plunger pump 12 is a constant pressure variable plunger pump group, and other plunger pumps can be used.
As shown in fig. 6, the constant pressure variable plunger pump 12 is connected to the proportional pressure regulating mechanism 13 through the check valve 3, the filter 2 is further disposed between the constant pressure variable plunger pump 12 and the proportional pressure regulating mechanism 13, and the filter 2 is a high pressure oil filter and is used for filtering oil in a loop of the proportional variable pump control device and protecting hydraulic elements.
As shown in fig. 1 and 2, the proportional pressure regulating mechanism 13 includes an oil manifold 1, and the oil manifold 1 is provided with a check valve 3, a pressure release valve 4, a valve/pump control switching valve 5, a pilot proportional relief valve 6, an accumulator 7, a valve control relief valve 8, a pressure detection mechanism, a temperature sensor 10, and an outlet ball valve 11. The pressure detection mechanism is a pressure sensor 9, the pressure sensor 9 is used for detecting the output pressure of the proportional variable pump control device loop and feeding the output pressure back to the electric control system 14, and the valve/pump control switching valve 5 is used for switching the control loop of the pilot proportional overflow valve 6, so that the proportional variable pump control device is in a pump control state or a valve control state, and the two states can be selectively switched according to the working condition used by a user and are suitable for different hydraulic output requirements.
When the pump control state is switched, the pilot proportional overflow valve 6 controls the pilot oil pressure of the constant-pressure variable plunger pump 12, the output pressure value of the proportional variable pump control device is preset through the pilot proportional overflow valve 6, the pressure sensor 9 is used for detecting the loop output pressure of the proportional variable pump control device and feeding the loop output pressure back to the electric control system 14, the constant-pressure variable plunger pump 12 outputs full flow before the proportional variable pump control device reaches the output pressure value of the proportional variable pump control device preset by the pilot proportional overflow valve 6, and the constant-pressure variable plunger pump 12 outputs the minimum automatic variable flow after the proportional variable pump control device reaches the output pressure value of the proportional variable pump control device preset by the pilot proportional overflow valve 6, so that the power is reduced, and at the moment, the valve control overflow valve 8 plays a role of a safety valve to prevent the high pressure overload of the proportional variable pump control device;
when the valve control state is switched, the pilot proportional overflow valve 6 controls the pilot oil pressure of the valve control overflow valve 8 to adjust the output pressure of the proportional variable pump control device, the constant-pressure variable plunger pump 12 maintains full-flow output, the pilot proportional overflow valve 6 controls the valve control overflow valve 8 to bear the overflow effect of the proportional variable pump control device to adjust the output pressure of the proportional variable pump control device and provide continuous and stable maximum flow output, and the output pressure is subjected to closed-loop control through a feedback signal of the pressure sensor 9 to realize proportional pressure adjustment.
The pressure relief valve 4 is used for pressure unloading of the proportional variable pump control device, the energy accumulator 7 is used for absorbing hydraulic pulse and maintaining output pressure stability of the proportional variable pump control device, and the pressure relief valve 4 and the valve/pump control switching valve 5 are both electromagnetic valves.
A control method of a proportional variable pump comprises the following steps:
step one, starting a motor of a constant-pressure variable plunger pump set, enabling a pressure release valve 4 to be powered after the motor runs stably, and enabling a proportional variable pump control device to start to build pressure;
selecting a pump control state, setting an output pressure value of the proportional variable pump control device, monitoring the output pressure of the proportional variable pump control device through a pressure sensor 9, and when the output pressure of the proportional variable pump control device reaches a set value, automatically changing a constant-pressure variable plunger pump set, reducing output power and maintaining stable pressure;
or, the valve control state is selected, the output pressure value of the proportional variable pump control device is set, the output pressure of the proportional variable pump control device is monitored through the pressure sensor 9, and when the output pressure of the proportional variable pump control device reaches the set value, the constant-pressure variable plunger pump set is invariant, the output power is kept, and the pressure and the flow are kept stable;
and step three, after the equipment operation is finished, the pressure release valve 4 loses power, the proportional variable pump control device releases pressure, and the equipment is shut down.
The working principle of the invention is as follows:
starting a motor of the constant-pressure variable plunger pump set, enabling a pressure release valve 4 to be powered after the motor runs stably, starting to build pressure by a proportional variable pump control device, and enabling hydraulic oil output by a common constant-pressure variable plunger pump to enter a proportional pressure regulating mechanism 13 through a filter 2;
the switching valve/pump control switching valve 5 selects a valve control state, the valve/pump control switching valve 5 controls a valve control overflow valve 8 through an A channel at the moment, a B channel is disconnected, a constant pressure variable plunger pump set maintains full flow output, a pilot proportional overflow valve 6 controls the valve control overflow valve 8 to bear the overflow effect of a proportional variable pump control device to adjust the output pressure of the proportional variable pump control device, and the output pressure is subjected to closed-loop control through a feedback signal of a pressure sensor 9 to realize proportional pressure adjustment;
the switching valve/pump control switching valve 5 selects a pump control state, at the moment, the valve/pump control switching valve 5 controls the valve control overflow valve 8 through the B passage, the A passage is disconnected, the output pressure value of the proportional variable pump control device is preset through the pilot proportional overflow valve 6, the pressure sensor 9 is used for detecting the loop output pressure of the proportional variable pump control device and feeding the loop output pressure back to the electronic control system 14, the constant pressure variable plunger pump 12 outputs full flow before the proportional variable pump control device reaches the output pressure value of the proportional variable pump control device preset by the pilot proportional overflow valve 6, and the constant pressure variable plunger pump 12 outputs the minimum automatic variable flow after the proportional variable pump control device reaches the output pressure value of the proportional variable pump control device preset by the pilot proportional overflow valve 6, so that the power is reduced.
Wherein, the A channel is communicated with the valve/pump control switching valve 5 and the valve control overflow valve 8, and the B channel is communicated with the constant pressure variable plunger pump 12, the outlet ball valve 11 and the valve control overflow valve 8
The invention is described above with reference to the accompanying drawings, it is obvious that the implementation of the invention is not limited in the above manner, and it is within the scope of the invention to adopt various modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.
Claims (10)
1. A proportional variable pump control device comprising a constant pressure variable plunger pump (12), characterized in that: the constant pressure variable plunger pump (12) is connected with a proportional pressure regulating mechanism (13), the proportional pressure regulating mechanism (13) comprises a valve/pump control switching valve (5), a pilot proportional overflow valve (6), a valve control overflow valve (8) and a pressure detection mechanism, the pressure detection mechanism is used for detecting the output pressure of a proportional variable pump control device loop and feeding back the output pressure to an electric control system (14), the valve/pump control switching valve (5) is used for switching the control loop of the pilot proportional overflow valve (6), so that the proportional variable pump control device is in a pump control state or a valve control state, when the proportional variable pump control device is switched to the pump control state, the pilot proportional overflow valve (6) controls the pilot oil pressure of the constant pressure variable plunger pump (12), the constant pressure variable plunger pump (12) automatically changes when reaching the set pressure, and the valve control overflow valve (8) plays a role of a safety valve at the moment, the high pressure overload of the proportional variable pump control device is prevented; when the valve control state is switched, the pilot proportional overflow valve (6) controls the pilot oil pressure of the valve control overflow valve (8) to adjust the output pressure of the proportional variable pump control device, and the pilot proportional overflow valve (6) controls the valve control overflow valve (8) to bear the overflow effect of the proportional variable pump control device to adjust the output pressure of the proportional variable pump control device.
2. The proportional variable pump control device according to claim 1, wherein: when the pump control state is switched, the constant-pressure variable plunger pump (12) outputs full flow before the proportional variable pump control device reaches the preset pressure value of the pilot proportional overflow valve (6), and automatically outputs minimum variable flow after the proportional variable pump control device reaches the preset pressure value of the pilot proportional overflow valve (6), so that the power is reduced.
3. The proportional variable pump control device according to claim 2, wherein: when the pump control state is switched, the valve control overflow valve (8) acts as a safety valve to prevent the high pressure overload of the proportional variable pump control device.
4. The proportional variable pump control device according to claim 1, wherein: when the valve control state is switched, the output flow of the constant pressure variable plunger pump (12) is constant, and the output pressure is subjected to closed-loop control through a feedback signal of the pressure detection mechanism to realize proportional pressure regulation.
5. The proportional variable pump control device according to claim 4, wherein: the pressure detection mechanism is a pressure sensor (9).
6. The proportional variable pump control device according to any one of claims 1-5, wherein: and a filter (2) is also arranged between the constant-pressure variable plunger pump (12) and the proportional pressure regulating mechanism (13) and is used for filtering oil liquid in a loop of the proportional variable pump control device and protecting a hydraulic element.
7. The proportional variable pump control device according to any one of claims 1-5, wherein: the proportional pressure regulating mechanism (13) further comprises a pressure relief valve (4) for pressure unloading of the proportional variable pump control device.
8. The proportional variable pump control device according to claim 7, wherein: the proportional variable pump control device further comprises an accumulator (7), wherein the accumulator (7) is used for absorbing hydraulic pulses and maintaining the output pressure of the proportional variable pump control device to be stable.
9. The proportional variable pump control device according to claim 1, wherein: the proportional variable pump control device is characterized in that an equipment outer cover (15) is arranged on the outer side of the proportional variable pump control device, an electric control system (14), an oil tank device (16) and a cooling circulation system (17) are arranged in the equipment outer cover (15), and the constant-pressure variable plunger pump (12) is a constant-pressure variable plunger pump set.
10. A proportional variable pump control method including the proportional variable pump control device according to any one of claims 1 to 9, the pressure detection mechanism being a pressure sensor (9), the proportional variable pump control method comprising the steps of:
step one, starting a motor of a constant-pressure variable plunger pump set, enabling a pressure relief valve (4) to be powered after the motor runs stably, and enabling a proportional variable pump control device to start to build pressure;
selecting a pump control state, setting an output pressure value of the proportional variable pump control device, monitoring the output pressure of the proportional variable pump control device through a pressure sensor (9), and automatically changing the constant-pressure variable plunger pump set to reduce the output power and maintain the pressure to be stable when the output pressure of the proportional variable pump control device reaches a set value;
or, selecting a valve control state, setting an output pressure value of the proportional variable pump control device, monitoring the output pressure of the proportional variable pump control device through a pressure sensor (9), and keeping the output power and the pressure and the flow stable by the constant-pressure variable plunger pump set invariant after the output pressure of the proportional variable pump control device reaches a set value;
and step three, after the equipment operation is finished, the pressure relief valve (4) loses power, the proportional variable pump control device relieves pressure, and the equipment is shut down.
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| CN202110580601.4A CN113236616B (en) | 2021-05-26 | 2021-05-26 | Proportional variable pump control device and control method thereof |
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| CN202110580601.4A CN113236616B (en) | 2021-05-26 | 2021-05-26 | Proportional variable pump control device and control method thereof |
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| CN113236616B true CN113236616B (en) | 2022-01-11 |
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