CN111577717A - Overflow loss recovery system based on hydraulic motor and control method thereof - Google Patents
Overflow loss recovery system based on hydraulic motor and control method thereof Download PDFInfo
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- CN111577717A CN111577717A CN202010436156.XA CN202010436156A CN111577717A CN 111577717 A CN111577717 A CN 111577717A CN 202010436156 A CN202010436156 A CN 202010436156A CN 111577717 A CN111577717 A CN 111577717A
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- valve
- oil
- hydraulic motor
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/14—Energy-recuperation means
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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
- F15B11/16—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors
- F15B11/18—Servomotor systems without provision for follow-up action; Circuits therefor with two or more servomotors used in combination for obtaining stepwise operation of a single controlled member
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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
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
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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
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention provides an overflow loss recovery system based on a hydraulic motor, which comprises an oil tank, a main pump, a first one-way valve, a first reversing valve, a first overflow valve and a hydraulic cylinder, wherein the first overflow valve is provided with a first valve oil outlet and a pilot oil outlet, the first valve oil outlet is connected with a second reversing valve, the second reversing valve is provided with a second oil outlet and a second oil inlet, one of the second oil outlets is connected with the hydraulic motor, and the hydraulic motor is in transmission connection with a generator. The invention also provides an overflow loss recovery control method based on the hydraulic motor. Through the organic combined action to switching-over valve, overflow valve, check valve, hydraulic motor and generator etc. realize realizing the energy recuperation to overflow valve port overflow loss, realize energy recuperation through adopting hydraulic motor and generator to turn into the electric energy with the hydraulic energy of overflow valve exit loss, because the generator can carry out active control, can solve valve port pressure differential loss in order to realize high-efficient energy recuperation.
Description
Technical Field
The invention relates to an energy-saving control system and a control method thereof, in particular to an overflow loss recovery system based on a hydraulic motor and a control method thereof.
Background
The outlet of the proportional overflow valve (conventional) is generally connected with an oil tank, the overflow valve works, the valve port differential pressure loss of the proportional overflow valve is the inlet pressure of the overflow valve, the higher the overflow pressure grade is, the higher the valve port differential pressure loss is, the overflow flow is different along with the different types of hydraulic systems, and the problem of the overflow loss is more serious along with the trend of high-pressure grade of the hydraulic systems. The overflow loss of the overflow valve is related to the type of the hydraulic system, the actual working condition in the working process and the operation mode of an operator. The overflow loss is mainly divided into pressure-regulating overflow loss and safe overflow loss according to the function of the overflow valve. In the inlet throttling speed regulation loop and the outlet throttling speed regulation loop, the overflow valve has an overflow pressure regulation function, and part of hydraulic oil always passes through the overflow valve oil return tank, so that the overflow valve always has overflow loss. When the overflow valve acts as a safety valve, the overflow valve can work only under certain working conditions, but overflow loss also exists. At present, traditional energy-saving hydraulic driving systems such as a positive flow technology, a negative flow technology, a load sensing technology and the like all belong to flow coupling systems, although the energy utilization rate of a hydraulic excavator can be improved to a certain degree, the problem of throttling loss of the hydraulic system is solved more, or the flow passing through an overflow valve port is reduced as much as possible through flow optimization matching, and the problem of overflow loss of an overflow element is not solved fundamentally.
The conventional overflow valve overflow loss recovery and recycling system based on the hydraulic accumulator disclosed in the Chinese patent with the publication number of CN106122188B is a system designed by the applicant in the early stage, the hydraulic accumulator is used as an energy storage element, although the problem of overflow loss of the overflow element can be solved under certain conditions, because the pressure of the accumulator cannot be actively controlled, in a proportional overflow valve with the target pressure dynamically adjusted, the pressure difference of an overflow valve port cannot be set according to the minimum pressure difference, certain valve port pressure difference loss still exists, and efficient energy recovery is difficult to realize.
In view of the above, the applicant has made intensive studies to solve the above problems and has made the present invention.
Disclosure of Invention
The invention aims to provide a hydraulic motor-based overflow recovery system and a control method thereof, which can solve the problem of valve port differential pressure loss to realize efficient energy recovery.
In order to achieve the purpose, the invention adopts the following technical scheme:
an overflow loss recovery system based on a hydraulic motor comprises an oil tank, a main pump with an oil inlet connected with the oil tank, a first one-way valve with an oil inlet connected with an oil outlet of the main pump, a first reversing valve and a first overflow valve with an oil inlet connected with an oil outlet of the first one-way valve respectively, and a hydraulic cylinder connected with the first reversing valve, wherein the first reversing valve is provided with a first oil discharge port and two first oil outlets, one of the first oil outlets is communicated with a rod cavity of the hydraulic cylinder, the other first oil outlet is communicated with a rodless cavity of the hydraulic cylinder, the first oil discharge port is communicated with the oil tank, the first overflow valve is provided with a first valve oil outlet and a pilot oil outlet communicated with the oil tank, the first valve oil outlet is connected with a second reversing valve, and the second reversing valve is provided with two second oil outlets and a second oil inlet communicated with the first valve oil outlet, one of the second oil outlets is connected with a hydraulic motor, the other second oil outlet is connected with the oil tank, the hydraulic motor is connected with a generator in a transmission mode, an electric interface of the generator is connected with a motor driver, and a power supply is connected to the motor driver.
As a modification of the present invention, the power source is a battery.
As an improvement of the invention, a second one-way valve is also connected to the second oil outlet connected with the hydraulic motor, an oil inlet of the second one-way valve is communicated with the first oil outlet connected with the hydraulic motor, and an oil outlet of the second one-way valve is communicated with the oil tank.
As an improvement of the invention, a second overflow valve is also connected to the first oil outlet connected with the hydraulic motor, and the oil outlet of the second overflow valve is communicated with the oil tank.
As an improvement of the invention, the first reversing valve is a three-position four-way reversing valve, and the second reversing valve is a two-position two-way reversing valve.
As an improvement of the present invention, the second relief valve is a pilot relief valve or a direct relief valve.
The oil pressure sensor is characterized by further comprising a controller in communication connection with the motor driver, and a first sensor used for detecting the oil pressure of an oil outlet of the first valve and a second sensor used for detecting the oil pressure of an oil inlet of the first overflow valve are further in communication connection with the controller.
The overflow loss recovery control method based on the hydraulic motor comprises the steps of collecting oil pressure of an oil inlet of a first overflow valve to obtain inlet pressure, collecting oil pressure of an oil outlet of the first valve to obtain outlet pressure, and controlling the rotating speed of the hydraulic motor and/or a generator by taking the difference value of the inlet pressure and the outlet pressure as a target value and the outlet pressure as a feedback quantity to ensure that the difference value of the inlet pressure and the outlet pressure is maintained within a preset range.
By adopting the technical scheme, the invention has the following beneficial effects:
1. through the organic combined action to switching-over valve, overflow valve, check valve, hydraulic motor and generator etc. realize realizing the energy recuperation to overflow valve port overflow loss, realize energy recuperation through adopting hydraulic motor and generator to turn into the electric energy with the hydraulic energy of overflow valve exit loss, because the generator can carry out active control, can solve valve port pressure differential loss in order to realize high-efficient energy recuperation.
2. By adopting the variable-speed-based valve port differential pressure control method, the system can effectively solve the problem of differential pressure loss of the overflow valve port in the overflow valve with dynamically changed target pressure and overflow flow, realize efficient energy recovery and simultaneously improve the pressure control precision of the overflow valve and the stability of the system flow.
Drawings
FIG. 1 is a schematic diagram of a hydraulic motor based spill loss recovery system according to the present invention;
FIG. 2 is a flow chart of a control strategy of the control method of the present invention.
The corresponding designations in the figures are as follows:
1-an oil tank; 2-main pump;
3-a first one-way valve; 4-a first reversing valve;
5-a first overflow valve; 6-hydraulic cylinder;
7-driving a motor; 8-a second reversing valve;
9-a hydraulic motor; 10-a second one-way valve;
11-a second overflow valve; 12-a generator;
13-a motor driver; 14-a power supply;
15-a controller.
Detailed Description
The invention will be further described with reference to specific examples:
as shown in fig. 1, the embodiment provides an overflow loss recovery system based on a hydraulic motor, which includes an oil tank 1, a main pump 2 having an oil inlet connected to the oil tank, a first check valve 3 having an oil inlet connected to an oil outlet of the main pump 2, a first reversing valve 4 and a first overflow valve 5 having oil inlets connected to oil outlets of the first check valve 3, and a hydraulic cylinder 6 connected to the first reversing valve 4. The main pump 2 can be a fixed displacement pump or a variable displacement pump, and can be selected according to actual needs; the main pump 2 is driven by a driving motor 7, and specifically, an input shaft of the main pump 2 and an output shaft of the driving motor 7 are coaxially connected through a coupler. In addition, each valve mentioned in the present embodiment is a solenoid valve.
The first reversing valve 4 is a three-position four-way reversing valve, which has a first oil discharge port (i.e. a port T of the reversing valve), two first oil discharge ports (i.e. a port a and a port B of the reversing valve), and an oil inlet (i.e. a port P of the reversing valve) communicated with the oil outlet of the first check valve 3, the first oil discharge port is communicated with the oil tank 1, one of the first oil discharge ports (in this embodiment, the port a of the reversing valve) is communicated with the rod chamber of the hydraulic cylinder 6, and the other first oil discharge port (in this embodiment, the port B of the reversing valve) is communicated with the rodless chamber of the hydraulic cylinder 6, for controlling the telescopic action of the hydraulic cylinder 6, specifically, when the oil flows into the rodless chamber, the oil in the rod chamber flows back to the oil tank 1 through the port B of the reversing valve, the hydraulic cylinder 6 performs the piston rod extending action, otherwise, the hydraulic cylinder 6 performs the piston rod retracting, the hydraulic drive device is widely applied to various hydraulic drive devices such as excavators, can be directly purchased and obtained from the market, is not the key point of the embodiment, and is not detailed here.
The second reversing valve 8 is a two-position two-way reversing valve, and has two second oil outlets (i.e. a port a and a port B of the reversing valve) and a second oil inlet (a port P of the reversing valve) communicated with the oil outlet of the first valve, wherein one of the second oil outlets (in this embodiment, the port a of the reversing valve) is connected with the hydraulic motor 9, and the other second oil outlet (in this embodiment, the port B of the reversing valve) is connected with the oil tank 1, preferably, in order to prevent the hydraulic motor 9 from generating a suction phenomenon, the second oil outlet (i.e. the port a of the reversing valve) connected with the hydraulic motor 9 is further connected with a second one-way valve 10, the oil inlet of the second one-way valve 10 is communicated with the first oil outlet connected with the hydraulic motor, and the oil outlet of the second one-way valve 10 is communicated with the oil tank 1, so that oil can be replenished through the second one-way; in addition, in order to prevent the pressure of the inlet of the hydraulic motor 9 from suddenly changing at the moment of starting or stopping the system to affect the normal operation of the first overflow valve 5, in this embodiment, the first oil outlet connected with the hydraulic motor 9 is further connected with a second overflow valve 11, and the second overflow valve 11 may be a pilot-operated overflow valve or a direct-operated overflow valve, and the oil outlet thereof is communicated with the oil tank 1 for pressure relief at the moment of starting or stopping the system.
An oil outlet of the hydraulic motor 9 is communicated with the oil tank 1, the hydraulic motor 9 is in transmission connection with a generator 12, and specifically, an input shaft of the generator 12 is coaxially connected with an output shaft of the hydraulic motor 9 through a coupler. A motor drive 13 is connected to the electrical interface of the generator 12, and a power source 14, preferably a battery, is connected to the motor drive 13. In addition, the system provided by the present embodiment further includes a controller 15 in communication connection with the motor driver 13, and a first sensor for detecting the oil pressure at the oil outlet of the first valve and a second sensor for detecting the oil pressure at the oil inlet of the first relief valve 5 are also in communication connection with the controller 15. It should be noted that the controller 15 is a conventional controller, and can be directly purchased from the market and configured according to actual functional requirements, and the specific communication connection structure between the controller and the motor driver 13, the first sensor and the second sensor is also a conventional structure, such as a wire connection or a bluetooth wireless connection, and is not a focus of the embodiment, and is not described in detail herein.
As shown in fig. 2, the present embodiment also provides a spill loss recovery control method based on a hydraulic motor, the method is realized by adopting the overflow loss recovery system of the hydraulic motor, and particularly, when the system is used, the oil pressure of the oil inlet of the first overflow valve 5 is collected to obtain the inlet pressure, the oil pressure of the oil outlet of the first valve is collected to obtain the outlet pressure, the speed of the hydraulic motor 9 and/or generator 12 is then controlled with the difference between the inlet and outlet pressures as a target value and the outlet pressure as a feedback amount to ensure that the difference between the inlet and outlet pressures is maintained within a predetermined range, typically the target value, the specific numerical value of the pressure difference valve is determined according to actual conditions, and in a system with the overflow valve target pressure capable of changing dynamically, the valve port pressure difference can be set according to the minimum value, so that the problem of pressure difference loss of the overflow valve is effectively solved.
When the system works in a traditional working mode, the second reversing valve 8 works in the lower position (the upper position and the lower position of the second reversing valve 8 are shown in figure 1), and hydraulic oil flows back to the oil tank 1 through the pilot oil outlet of the first overflow valve 5; when the system works in an energy recovery mode, the second reversing valve 8 works in an upper position, hydraulic oil passing through the oil outlet of the first valve of the first overflow valve 5 enters the hydraulic motor 9, and oil is supplemented through the second one-way valve 10 to prevent the hydraulic motor 9 from being empty; the highest pressure at the inlet of the hydraulic motor 9 is controlled by the second overflow valve 11, so that the pressure at the inlet of the hydraulic motor 9 is prevented from suddenly changing when the system is started or stopped, and the normal work of the first overflow valve 5 is prevented from being influenced.
The system and the method provided by the embodiment are suitable for oil paths comprising an inlet throttling and speed regulating loop, an outlet throttling and speed regulating loop, an inlet and outlet linkage throttling and speed regulating loop, a bypass throttling and speed regulating loop and the like, and energy recovery is carried out on pressure regulating overflow loss or safety overflow loss generated by the loops. The system and the method provided by the embodiment are mainly used for recovering overflow valve overflow loss energy of walking machines such as excavators, forklifts and loaders and various types of fixed machines, and under various working conditions, the valve port pressure difference value is controlled to be the minimum value which ensures the normal work of the overflow valve all the time, so that the problem of pressure difference loss of the overflow valve is solved, the recovery pressure range of the overflow loss is expanded, and the energy recovery utilization rate is improved.
According to the overflow loss recovery system based on the hydraulic motor and the control method thereof, most of the original pressure difference consumed on the overflow valve port is converted into electric energy through the hydraulic motor and the generator to be recovered; the system adopts a variable-speed-based valve port differential pressure control method, controls the inlet and outlet differential pressure value of the overflow valve to be the minimum value for ensuring the normal work of the overflow valve, and solves the problem of differential pressure loss on the overflow valve. When the target pressure and the overflow flow of the overflow valve are dynamically changed, the pressure of the system can be quickly responded, so that the system has good recovery efficiency. The energy recovery mode increases the outlet pressure of the overflow valve, which improves the stability of the hydraulic system and the pressure control characteristic of the overflow valve to a certain extent.
The present invention is described in detail with reference to the attached drawings, but the embodiments of the present invention are not limited to the above embodiments, and those skilled in the art can make various modifications to the present invention based on the prior art, which fall within the scope of the present invention.
Claims (8)
1. An overflow loss recovery system based on a hydraulic motor is characterized by comprising an oil tank, a main pump with an oil inlet connected with the oil tank, a first one-way valve with an oil inlet connected with an oil outlet of the main pump, a first reversing valve and a first overflow valve with oil inlets respectively connected with oil outlets of the first one-way valve, and a hydraulic cylinder connected with the first reversing valve, wherein the first reversing valve is provided with a first oil discharge port and two first oil outlets, one of the first oil outlets is communicated with a rod cavity of the hydraulic cylinder, the other first oil outlet is communicated with a rodless cavity of the hydraulic cylinder, the first oil discharge port is communicated with the oil tank, the first overflow valve is provided with a first valve oil outlet and a pilot oil outlet communicated with the oil tank, the first valve oil outlet is connected with a second reversing valve, the second reversing valve is provided with two second oil outlets and a second oil inlet communicated with the first valve oil outlet, one of the second oil outlets is connected with a hydraulic motor, the other second oil outlet is connected with the oil tank, the hydraulic motor is connected with a generator in a transmission mode, an electric interface of the generator is connected with a motor driver, and a power supply is connected to the motor driver.
2. A hydraulic motor based spill loss recovery system as claimed in claim 1, wherein said power source is a battery.
3. The hydraulic motor based overflow loss recovery system of claim 1, wherein a second one-way valve is further connected to the second oil outlet to which the hydraulic motor is connected, an oil inlet of the second one-way valve is communicated with the first oil outlet to which the hydraulic motor is connected, and an oil outlet of the second one-way valve is communicated with the oil tank.
4. The hydraulic motor based spill loss recovery system of claim 1, wherein a second spill valve is further connected to the first outlet port to which the hydraulic motor is connected, an outlet port of the second spill valve being in communication with the oil tank.
5. The hydraulic motor based spill loss recovery system of claim 1, wherein the first directional valve is a three-position, four-way directional valve and the second directional valve is a two-position, two-way directional valve.
6. A hydraulic motor based spill loss recovery system as claimed in claim 1, wherein said second spill valve is a pilot-operated spill valve or a direct-operated spill valve.
7. The hydraulic motor based spill loss recovery system of claim 1, further comprising a controller communicatively coupled to the motor drive, the controller further communicatively coupled to a first sensor for detecting oil pressure at the first valve outlet and a second sensor for detecting oil pressure at the first spill valve inlet.
8. A hydraulic motor-based overflow loss recovery control method is characterized in that the overflow loss recovery system of the hydraulic motor is adopted, the oil pressure of an oil inlet of a first overflow valve is collected to obtain inlet pressure, the oil pressure of an oil outlet of a first valve is collected to obtain outlet pressure, the difference value of the inlet pressure and the outlet pressure is used as a target value, and the outlet pressure is used as a feedback quantity to control the rotation speed of the hydraulic motor and/or the generator so as to ensure that the difference value of the inlet pressure and the outlet pressure is maintained within a preset range.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010436156.XA CN111577717B (en) | 2020-05-21 | 2020-05-21 | Overflow loss recovery system based on hydraulic motor and control method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010436156.XA CN111577717B (en) | 2020-05-21 | 2020-05-21 | Overflow loss recovery system based on hydraulic motor and control method thereof |
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| CN111577717A true CN111577717A (en) | 2020-08-25 |
| CN111577717B CN111577717B (en) | 2022-07-08 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101408212A (en) * | 2008-10-31 | 2009-04-15 | 浙江大学 | Energy recovery system of hybrid power engineering machinery actuating element |
| CN201288721Y (en) * | 2008-10-31 | 2009-08-12 | 浙江大学 | Energy recovery system of mixed power single-valve multiple actuator assembly |
| US20160289925A1 (en) * | 2013-10-15 | 2016-10-06 | Xuzhuo Xugong Excavator Machinery Co., Ltd. | Rotatory energy recycling control device for hydraulic excavator |
| CN106122188A (en) * | 2016-08-12 | 2016-11-16 | 华侨大学 | Conventional overflow valve overflow based on hydraulic accumulator loss recycle and reuse system |
-
2020
- 2020-05-21 CN CN202010436156.XA patent/CN111577717B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101408212A (en) * | 2008-10-31 | 2009-04-15 | 浙江大学 | Energy recovery system of hybrid power engineering machinery actuating element |
| CN201288721Y (en) * | 2008-10-31 | 2009-08-12 | 浙江大学 | Energy recovery system of mixed power single-valve multiple actuator assembly |
| US20160289925A1 (en) * | 2013-10-15 | 2016-10-06 | Xuzhuo Xugong Excavator Machinery Co., Ltd. | Rotatory energy recycling control device for hydraulic excavator |
| CN106122188A (en) * | 2016-08-12 | 2016-11-16 | 华侨大学 | Conventional overflow valve overflow based on hydraulic accumulator loss recycle and reuse system |
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| CN111577717B (en) | 2022-07-08 |
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