CN111442002A - Temperature control air bag type constant-pressure energy accumulator - Google Patents
Temperature control air bag type constant-pressure energy accumulator Download PDFInfo
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- CN111442002A CN111442002A CN202010382491.6A CN202010382491A CN111442002A CN 111442002 A CN111442002 A CN 111442002A CN 202010382491 A CN202010382491 A CN 202010382491A CN 111442002 A CN111442002 A CN 111442002A
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- air bag
- temperature control
- end cover
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
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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
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
- F15B1/08—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor
- F15B1/10—Accumulators using a gas cushion; Gas charging devices; Indicators or floats therefor with flexible separating 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
The invention relates to a temperature control air bag type constant-pressure energy accumulator, and aims to solve the technical problems that a traditional air bag type energy accumulator cannot output stable pressure in the working process, a hydraulic system can pulsate, and the service life of components is influenced. The energy accumulator comprises a pressure container and an air bag positioned in the pressure container, wherein two connecting ends of the air bag are arranged at the connecting part of an upper shell and a lower shell, the air bag divides the pressure container into an air cavity and a liquid cavity, a temperature control device is arranged in the air cavity, an anti-scalding cover is arranged on the periphery of the temperature control device, a temperature sensor and a pressure sensor are also arranged in the air cavity, a displacement sensor is arranged on the inner wall of the air bag, and the temperature control device, the temperature sensor, the pressure sensor and the displacement sensor are all connected with a processor. The energy accumulator can output stable pressure in the working process, effectively improves the charging and discharging characteristics of the energy accumulator, improves the power density of the energy accumulator, and can meet the requirements of modern hydraulic systems on economy, high efficiency, environmental protection, energy conservation, safety and reliability.
Description
Technical Field
The invention belongs to the technical field of hydraulic transmission control technology and energy storage, and particularly relates to a temperature control air bag type constant-pressure energy accumulator.
Background
The utility of conventional accumulators in conventional hydraulic systems can be divided into three broad categories: storing energy, reducing pressure impact and absorbing pressure pulsation. The energy accumulator has obvious effects of economy, energy conservation, safety, reliability and the like brought to the system. Are commonly used in modern hydraulic systems. However, with the development of hydraulic system research and the development of novel components, the existing energy accumulator can not meet the use requirement and restricts the overall development of hydraulic system research to a certain extent.
The most common hydraulic accumulator used today is the airbag accumulator. It is based on the Boyle's law of gas and can convert energy by compressing gas. The gas and oil are separated by a gas bag in the accumulator. When in use, the air bag is firstly inflated with gas with preset pressure. When the pressure of the hydraulic system exceeds the internal pressure of the energy accumulator, the oil compresses gas, and the pressure in the oil is converted into gas internal energy; when the hydraulic system pressure is lower than the accumulator internal pressure, the oil in the accumulator flows to the external system under the action of the high pressure gas, releasing energy.
According to the gas Boyle's law, under the condition of quantitative constant temperature, the volume and the pressure of ideal gas are in an inverse proportion relation, so that the traditional airbag type energy accumulator cannot output stable pressure in the working process, the pulsation of a hydraulic system can be caused, and the service life and the reliability of components are influenced. When the pressure difference between the inside and the outside of the energy accumulator is small, the charging and discharging characteristics of the energy accumulator are poor, so that the power density of the energy accumulator is low, and the overall working performance of the system is influenced.
Disclosure of Invention
Aiming at the problems, the invention provides a temperature control air bag type constant pressure energy accumulator which can output stable pressure in the working process, effectively improve the charge and discharge characteristics of the energy accumulator, improve the power density of the energy accumulator and meet the requirements of modern hydraulic systems on economy, high efficiency, environmental protection, energy conservation, safety and reliability.
In order to solve the technical problems, the invention adopts the technical scheme that:
a temperature control air bag type constant-pressure energy accumulator comprises a pressure container, wherein the pressure container consists of an upper shell and a lower shell, an upper end cover is arranged at the upper end of the upper shell, an air valve base is arranged in the middle of the upper end cover, an air vent is arranged in the middle of the air valve base, an inflation valve is arranged on the air valve base, a lower end cover is arranged at the lower end of the lower shell, and an oil side connector is arranged in the middle of the lower end cover;
the temperature control device is characterized by further comprising an air bag located in the pressure container, the two connecting ends of the air bag are arranged at the joint of the upper shell and the lower shell, the air bag divides the pressure container into an air cavity and a liquid cavity, a temperature control device is arranged in the air cavity, an anti-scalding cover is arranged on the periphery of the temperature control device, a temperature sensor and a pressure sensor are further arranged in the air cavity, a displacement sensor is arranged on the inner wall of the air bag, the temperature control device, the temperature sensor, the pressure sensor and the displacement sensor are all connected with the processor.
Furthermore, the temperature control device is a section of heating pipe wound spirally, the heating pipe sequentially comprises a heat conduction insulation outer layer, a resistance wire, a heat conduction insulation inner layer and a hollow pipeline from outside to inside, and two connecting ends of the temperature control device penetrate through the upper end cover and are communicated with a cooling medium through a hydraulic valve. And a resistance wire of the temperature control device is connected with a power supply through an on-off switch, and the on-off state of the on-off switch is controlled by a processor.
Furthermore, the inflation valve is in threaded connection with the air valve base, and a metal gasket is arranged between the inflation valve and the air valve base.
Furthermore, the upper end cover is in threaded connection with the air valve base, the position of the air valve base is fixed through a stop nut, and a check ring and an O-shaped rubber sealing ring are installed between the upper end cover and the air valve base.
Furthermore, the upper shell is connected with the upper end cover through a threaded ring, and a check ring and an O-shaped rubber sealing ring are arranged between the upper shell and the upper end cover.
Furthermore, the lower shell is connected with the lower end cover through a threaded ring, and a check ring and an O-shaped rubber sealing ring are arranged between the lower shell and the lower end cover.
Further, the upper shell and the lower shell are connected through bolts, and the connection position of the upper shell and the lower shell is in a v shape.
Furthermore, the air bag adopts a foldable and telescopic structure, a gap is reserved between the outer walls of the two sides of the air bag and the inner wall of the lower shell, and the thickness of the bottom of the air bag is greater than that of the side wall.
Further, prevent scalding the cover and be tube-shape hollow out construction, prevent scalding the upper end of cover and press as an organic whole with the bottom mould of upper end cover.
Further, both outer sides of the lower case are replaced by composite material layers.
Further, the device also comprises an alarm device, and the alarm device is connected with the processor.
The invention has the beneficial effects that:
1. the invention adopts the air bag structure, and the composite material layers are arranged on the two outer sides of the lower shell, so that the integral structure has small size, light weight, high strength, good impact resistance, convenient installation and easy maintenance. The air bag has small inertia, sensitive response and reliable work.
2. The invention can stably output stable pressure oil with any specified pressure value in a certain range, and reduces pressure impact and flow pulsation in the system. Based on an ideal gas state equation and a gas dynamic theory, the gas temperature in the gas bag is adjusted in real time in the working process and is matched with the gas volume, so that the gas pressure value can be constant, and the accumulator is ensured to output oil with stable pressure.
3. The invention improves the charge and discharge characteristics of the energy accumulator and improves the working efficiency of the energy accumulator. The invention solves the problem that the energy of the system can not be fully absorbed or released due to the reduction of the internal and external pressure difference in the later stage of charging and discharging of the traditional energy accumulator by ensuring the stable pressure of the gas in the air bag, thereby causing the waste of the energy.
4. The invention can convert hydraulic energy into gas pressure energy and heat energy, and improves the energy recovery efficiency.
5. The invention can monitor the working state of the energy accumulator in real time and adopts the alarm device, thereby improving the safety and the convenience of the use of the equipment.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional detail view of the temperature control device of the present invention;
FIG. 3 is a schematic structural view of the scald-proof cover of the present invention;
FIG. 4 is a schematic view of the accumulator operating condition of the present invention;
FIG. 5 is a flow chart of the accumulator control of the present invention;
FIG. 6 is a schematic diagram of a hydraulic circuit of a swing mechanism of a hydraulic excavator in an embodiment of the invention;
in the figure: 1-upper shell, 2-lower shell, 3-upper end cover, 4-lower end cover, 5-air valve base, 6-vent hole, 7-inflation valve, 8-oil side interface, 9-air bag, 10-air cavity, 11-liquid cavity, 12-temperature control device, 12-1 heat conduction insulation outer layer, 12-2 resistance wire, 12-3 heat conduction insulation inner layer, 12-4 hollow pipeline, 13-scald preventing cover, 14-metal gasket, 15-stop nut, 16-retainer ring, 17-O-shaped rubber sealing ring, 18-thread ring, 19-screw, 20-composite material layer, 21-oil tank, 22-motor, 23-one-way variable hydraulic pump, 24 and 25-electromagnetic switch valve, 26-overflow valve, 27 and 28-electro-hydraulic proportional throttle valve, 29-four distribution window bidirectional variable hydraulic pump motor and 30-three-position four-way electro-hydraulic proportional reversing valve.
Detailed Description
The invention is further described below with reference to examples and figures.
As shown in fig. 1, the temperature control air bag type constant pressure energy accumulator described in this embodiment includes a pressure container, the pressure container is composed of an upper casing 1 and a lower casing 2, an upper end cover 3 is provided on the upper end of the upper casing 1, an air valve base 5 is provided in the middle of the upper end cover 3, an air vent 6 is provided in the middle of the air valve base 5 as an air passage, an inflation valve 7 is provided on the air valve base 5, a lower end cover 4 is provided at the lower end of the lower casing 2, and an oil side interface 8 is provided in the middle of the lower end cover 4 for connecting the energy accumulator into a hydraulic system.
The air bag type air compressor further comprises an air bag 9 positioned in the pressure container, two connecting ends of the air bag 9 are arranged at the connecting position of the upper shell 1 and the lower shell 2, and the air bag 9 is installed, fixed and sealed through extrusion of the two shells. The air bag 9 divides the pressure container into an air cavity 10 and a liquid cavity 11, a temperature control device 12 is arranged in the air cavity 10, and an anti-scald cover 13 is arranged on the periphery of the temperature control device 12 and used for protecting the air bag 9 and the temperature control device 12. The air cavity 10 is also internally provided with a temperature sensor and a pressure sensor, the inner wall of the air bag 9 is provided with a displacement sensor, the air bag further comprises a processor, and the temperature control device 12, the temperature sensor, the pressure sensor and the displacement sensor are all connected with the processor.
Preferably, the device is also provided with an alarm device, and the alarm device is connected with the processor. The working state of the energy accumulator can be monitored timely through the alarm device, and the use safety and convenience of the equipment are improved.
The inflation valve 7 is in threaded connection with the air valve base 5, and the air bag 9 of the energy accumulator is inflated through the inflation valve 7. And a metal gasket 14 is arranged between the inflation valve 7 and the air valve base 5, so that static sealing between the inflation valve 7 and the air valve base 5 can be realized.
The upper end cover 1 is in threaded connection with the air valve base 5, the position of the air valve base 5 is fixed through the stop nut 15, and the check ring 16 and the O-shaped rubber sealing ring 17 are installed between the upper end cover 1 and the air valve base 5 to achieve a sealing function.
The upper shell 1 is connected with the upper end cover 3 through a threaded ring 18, threads are machined in the threaded ring 18 and can be connected with external equipment through screws 19, and the energy accumulator is installed and fixed. And a retainer ring 16 and an O-shaped rubber sealing ring 17 are arranged between the upper shell 1 and the upper end cover 3 to realize the sealing function.
The lower shell 2 is connected with the lower end cover 4 through a threaded ring 18, threads are machined in the threaded ring 18 and can be connected with external equipment through screws 19, and the energy accumulator is installed and fixed. And a retainer ring 16 and an O-shaped rubber sealing ring 17 are arranged between the lower shell 2 and the lower end cover 4 to realize the sealing function.
The upper shell 1 and the lower shell 2 are connected through a bolt, and a metal gasket 14 is arranged on the outer side of the bolt for realizing sealing and supporting functions. The joint of the upper shell 1 and the lower shell 2 is in a v shape. The advantage of the v-shaped design is that the mounting area for the air-bag 9 is increased and a good sealing effect is achieved.
The air bag 9 is of a foldable and telescopic structure, gaps are reserved between the outer walls of the two sides of the air bag 9 and the inner wall of the lower shell 2, and the width of each gap does not hinder the expansion and contraction of the air bag 9. The advantage of this design is that it is ensured that the effective active area of the air chamber 10 in the air chamber 9 in the direction of charging and discharging the liquid chamber 11 of the accumulator according to the invention is constant. Therefore, the gas pressure of the gas cavity 10 is further ensured to be a stable value, and the aim of outputting stable pressure oil by the energy accumulator can be achieved. The bottom thickness of the air bag 9 is larger than the thickness of the side wall, the design has the advantages that the service life of the air bag 9 is prolonged, the impact generated when the air bag and the side wall are in contact can be absorbed, and the adverse effect of the impact on the system is reduced. Preferably, the air bag 9 is made of a material having high elasticity, good chemical stability, and good heat resistance, wear resistance, and pressure resistance.
As shown in fig. 2, the temperature control device 12 is a section of spirally wound heating pipe, the heating pipe sequentially comprises a heat-conducting insulating outer layer 12-1, a resistance wire 12-2, a heat-conducting insulating inner layer 12-3 and a hollow pipeline 12-4 from outside to inside, two connecting ends of the temperature control device 12 penetrate through the upper end cover 1 and are communicated with a cooling medium through a hydraulic valve, the resistance wire 12-2 of the temperature control device 12 is connected with a power supply through an on-off switch, and the on-off state of the on-off switch is controlled by a processor. The advantage of this design is that the spiral pattern can take up less space while allowing a larger contact area of the temperature control device 12 with air. The hollow pipe 12-4 can be used for inputting cooling medium into the temperature control device 12 to absorb heat generated by the increase of the internal energy of the gas and reduce the temperature and pressure of the gas in the gas cavity 10.
Preferably, the heat-conducting insulating outer layer 12-1 and the heat-conducting insulating inner layer 12-3 are made of crystalline magnesium oxide materials, and the crystalline magnesium oxide has good heat-conducting property and insulating property.
Preferably, the resistance wire 12-2 is made of nickel-chromium alloy. The design has the advantages that the nickel-chromium alloy has high strength under the high-temperature condition, and the structure is not easy to change; the plasticity is good, and the repair is easy; the radiation rate is high, the corrosion resistance is strong, and the service life is long.
As shown in fig. 3, the scald-proof cover 13 is a cylindrical hollow structure, and the upper end of the scald-proof cover 13 is molded with the bottom of the upper end cover 1 into a whole. The tubular hollow structure does not affect the work of the temperature control device 12, can also protect the temperature control device 12 from being extruded, and can protect the air bag 9 from being scalded.
Preferably, the burn-proof cover 13 is made of a heat-resistant material, such as a silicide fiber material. The silicide fiber has the advantages of stability, no toxicity, high and low temperature resistance, good corrosion resistance, good heat insulation effect, easy assembly and processing and the like.
The two outer sides of the lower shell 2 are replaced by composite material layers 20, and the composite material layers are made of carbon fiber materials or epoxy resin materials. The advantage of this design is that the use of the composite material layer reduces the mass of the inventive accumulator, achieving a light weight. Particularly, the composite material layer has the advantages of high strength, good pressure resistance, good wear resistance and the like, and the working performance of the energy accumulator is improved.
As shown in fig. 4 and 5, the working principle of the accumulator of the present invention is as follows:
the accumulator of the present invention is inflated as shown in fig. 4-1. The temperature control device 12 is in a non-operating state. The inflation device is matched with the inflation valve 7, and the air bag 9 is inflated through the vent hole 6 in the middle of the air valve base 5. And when the inflation is finished, closing the inflation valve 7 and disconnecting the inflation valve from the inflation device. At this time, the volume of the air cavity 10 reaches the maximum, and the outer surface of the air bag 9 is attached to the inner surface of the lower end cover 4.
When the accumulator of the invention is connected into the system and accumulates energy, as shown in figure 4-2. Hydraulic oil of the system enters the liquid cavity 11 through the oil side connector 8 and extrudes the air bag 9, the volume of gas in the air cavity 10 is reduced, the system applies work to the gas, and the internal energy of the gas is increased. When the air bag 9 is compressed to the minimum volume, a certain distance is still reserved between the air bag 9 and the scald-proof cover 13, so as to ensure that the temperature control device 12 inside the scald-proof cover 13 cannot be extruded and damaged or the air bag 9 cannot be scalded by the temperature control device 12.
During this charging process, the temperature control device 12 is in operation. A displacement sensor located inside the air bag 9 detects the displacement of the air bag 9, a temperature sensor detects the temperature of the gas in the air chamber 10, and a pressure sensor detects the pressure of the gas in the air chamber 10. The processor receives the information detected by the three sensors, and detects that the energy accumulator is in an energy storage state according to a designed program. The system does work on the gas in the gas cavity 10, the internal energy of the gas is increased, and the pressure and the temperature of the gas are increased. The processor sends an instruction to the temperature control device 12, so that the hollow pipeline 12-4 is introduced with a cooling medium (such as water, an ammonia solution, and the like) to absorb heat generated by the increase of the internal energy of the gas, and the heat can be used for the operation of other equipment of the system. The method belongs to the field of low-temperature heat energy recovery, and the utilization modes are classified into peer utilization and upgrading utilization. The same level uses the modes of preheating, heat tracing, temperature maintaining, heating and the like. The upgrading and utilizing modes comprise power generation, refrigeration, a second absorption heat pump and the like. After a period of time, the processor judges the end of the energy storage process according to the received state signal of the energy storage device and the set program. Thus, the hydraulic energy of the accumulator of the present invention is converted into the pressure energy of the gas in the gas chamber 10 and the heat energy absorbed by the temperature control device 12 after flowing water.
Particularly, when the pressure sensor detects that the gas pressure in the air cavity 10 reaches the maximum working pressure early warning interval of the energy accumulator, or the temperature sensor detects that the temperature of the gas in the air cavity 10 reaches the maximum working temperature early warning interval of the energy accumulator, the processor sends a signal to the alarm device to prompt workers. Meanwhile, the processor controls a reversing valve between the energy accumulator and the system, the oil circuit connection between the energy accumulator and the system is cut off, and the energy accumulator stops storing energy.
When the accumulator of the present invention is connected to the system and discharged, it is shown in fig. 4-3. The gas pressure in the gas cavity 10 is greater than the pressure of the hydraulic oil in the liquid cavity 11, the gas bag 9 expands, and the hydraulic oil in the liquid cavity 11 is extruded and enters the system through the oil side interface 8. When the energy release of the energy accumulator is finished, a certain amount of hydraulic oil can be left between the air bag 9 and the lower end cover 2 and can also be kept attached according to different working requirements of the system. The former has the function of ensuring that the accumulator still has the capacity to compensate leakage for the system, and the latter has the function of fully releasing the energy stored in the accumulator and improving the volumetric efficiency.
During this discharging, the temperature control device 12 is in operation. The displacement sensor positioned in the air bag 9 detects the displacement of the air bag 9, the temperature sensor detects the temperature of the gas in the air cavity 10, and the pressure sensor detects the pressure of the gas in the air cavity 10. The processor receives the information detected by the three sensors, and detects that the energy accumulator is in an energy release state at the moment according to a designed program, the gas in the air cavity 10 applies work to the outside, the internal energy is reduced, and the volume of the gas is increased, and the pressure and the temperature are reduced. The processor sends a signal to the temperature control device 12 according to the received state signal of the energy accumulator of the invention based on a given program to electrify the resistance wire 12-2 to generate heat, improve the temperature of the gas in the gas cavity 10 and keep the pressure of the gas in the gas cavity 10 stable, thereby realizing the function of outputting stable pressure oil by the energy accumulator of the invention. After a period of time, the processor judges that the discharging process is finished according to the received state signal of the energy accumulator and the set program. In particular, the temperature control device 12 can change the numerical relationship between the temperature and the volume of the gas in the gas chamber 10 within a certain range according to a set program, thereby realizing that the accumulator of the present invention can output any required stable pressure oil within a certain range.
Particularly, when the pressure sensor detects that the gas pressure in the air cavity 10 reaches the maximum working pressure early warning interval of the energy accumulator, or the temperature sensor detects that the temperature of the gas in the air cavity 10 reaches the maximum working temperature early warning interval of the energy accumulator, the processor sends a signal to the alarm device to prompt workers. Meanwhile, the processor sends a signal to the temperature control device to cut off the resistance wire 12-2, and a cooling medium is introduced into the hollow pipeline 12-4 to absorb heat, so that the temperature and the pressure of the gas in the gas cavity 10 are reduced. Furthermore, the processor controls a reversing valve between the energy accumulator and the system, the oil circuit connection between the energy accumulator and the system is cut off, and the energy accumulator stops discharging.
The temperature control air bag type constant pressure energy accumulator has the advantages of small structural size, light weight, high efficiency, good pressure resistance, sensitive response, safety, reliability, wide output pressure range and the like, and can be widely applied to various hydraulic working occasions.
As shown in fig. 6, the application of the accumulator of the present invention is illustrated by taking the dual-control hydraulic motor driving and kinetic potential energy recovery system of the swing mechanism of a hydraulic excavator as an example.
The four-port two-way variable hydraulic pump motor 29 is a hydraulic secondary element and can convert hydraulic energy and mechanical energy into each other. In the system circuit of fig. 6, the four port window pump motor 29 is functionally equivalent to two pump motors, which are defined herein for convenience as follows: the four-port two-way variable hydraulic pump motor 29 is divided into a main control motor and an auxiliary control motor according to work functions, an A, B port of the four-port two-way variable hydraulic pump motor 29 is called a main control motor port A, B, and a C, D port of the four-port two-way variable hydraulic pump motor 29 is called an auxiliary control motor port C, D.
The driving principle of the slewing mechanism is as follows: when the swing mechanism is started or accelerated, the main control motor and the auxiliary control motor are simultaneously in the working condition of the motors to jointly drive the load. The pump 23 is driven by the motor 22 to draw oil from the tank 21 and output the oil to the system. The pressure oil enters a main control motor flow distribution window B (or A) through an electromagnetic switch valve 24 (or 25), and returns to the oil tank 21 after entering an electro-hydraulic proportional throttle valve 27 (or 28) from the window A (or B) after acting; the overflow valve 26 is used for overload protection in the loop; the accumulator outputs stable pressure oil, enters an auxiliary control motor flow distribution window C (or D) through a three-position four-way electro-hydraulic proportional reversing valve 30, and returns to the oil tank 21 from the window D (or C) after applying work. According to the driving torque required by different working conditions, the load can be independently driven by only the main control motor or the auxiliary control motor, so that the stepped driving of the slewing mechanism is realized.
The principle of kinetic energy recovery: when the hydraulic excavator is braked in a rotating mode, kinetic energy generated by the load drags the four-distribution-window bidirectional variable hydraulic pump motor 29, and the auxiliary control motor is in a pump working condition. The auxiliary control motor passes through the three-position four-way electro-hydraulic proportional reversing valve 30, the flow distribution window C (or D) absorbs oil from the oil tank 21, the kinetic energy of the load is converted into hydraulic energy, and then the output pressure oil passes through the flow distribution window D (or C) and is stored in the energy accumulator. The kinetic energy of the load is thus converted into the pressure energy stored in the energy accumulator according to the invention and into the thermal energy absorbed by the temperature control device 12. When the working condition is needed, the auxiliary control motor in the motor working condition utilizes the pressure energy stored in the energy accumulator of the invention to drive the swing mechanism independently or jointly with the main control motor. The heat energy recovered in the energy accumulator can be used for other working equipment of the hydraulic excavator based on a low-temperature heat energy recovery technology.
The double-control motor driving and kinetic potential energy recovery system of the slewing mechanism of the hydraulic excavator based on the temperature control air bag type constant-pressure energy accumulator is characterized in that the main control motor and the auxiliary control motor of the slewing mechanism are jointly driven, so that kinetic energy can be efficiently recovered, the influence of the charging and discharging characteristics of the conventional energy accumulator on the operation performance is eliminated, and the working performance of a hydraulic system is improved.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims. It is to be understood that the above description is intended to be illustrative, and not restrictive.
Claims (10)
1. A temperature control air bag type constant-pressure energy accumulator comprises a pressure container, wherein the pressure container consists of an upper shell (1) and a lower shell (2), an upper end cover (3) is arranged at the upper end of the upper shell (1), an air valve base (5) is arranged in the middle of the upper end cover (3), an air vent (6) is arranged in the middle of the air valve base (5), an inflation valve (7) is arranged on the air valve base (5), a lower end cover (4) is arranged at the lower end of the lower shell (2), and an oil side interface (8) is arranged in the middle of the lower end cover (4);
the method is characterized in that: it still includes gasbag (9) that is located pressure vessel, the junction of last casing (1) and lower casing (2) is arranged in to two links of gasbag (9), gasbag (9) are divided into air cavity (10) and sap cavity (11) with pressure vessel, be equipped with temperature control device (12) in air cavity (10), the periphery of temperature control device (12) is equipped with prevents scalding cover (13), still be equipped with temperature sensor and pressure sensor in air cavity (10), be equipped with displacement sensor on the inner wall of gasbag (9), it still includes the treater, temperature control device (12), temperature sensor, pressure sensor and displacement sensor all are connected with the treater.
2. The temperature controlled air bag type constant pressure accumulator as claimed in claim 1, wherein: the temperature control device (12) is a section of spirally wound heating pipe, the heating pipe is sequentially provided with a heat conduction insulation outer layer (12-1), a resistance wire (12-2), a heat conduction insulation inner layer (12-3) and a hollow pipeline (12-4) from outside to inside, two connecting ends of the temperature control device (12) penetrate through the upper end cover (3) and are communicated with a cooling medium through a hydraulic valve, the resistance wire (12-2) of the temperature control device (12) is connected with a power supply through an on-off switch, and the on-off switch is controlled by the processor to be in an on-off state.
3. The temperature controlled air bag type constant pressure accumulator as claimed in claim 1, wherein: the inflation valve (7) is in threaded connection with the air valve base (5), and a metal gasket (14) is arranged between the inflation valve (7) and the air valve base (5).
4. The temperature controlled air bag type constant pressure accumulator as claimed in claim 1, wherein: the upper end cover (3) is in threaded connection with the air valve base (5), the position of the air valve base (5) is fixed through a stop nut (15), and a check ring and an O-shaped rubber sealing ring are installed between the upper end cover (3) and the air valve base (5).
5. The temperature controlled air bag type constant pressure accumulator as claimed in claim 1, wherein: the upper shell (1) is connected with the upper end cover (3) through a threaded ring, and a check ring and an O-shaped rubber sealing ring are arranged between the upper shell (1) and the upper end cover (3).
6. The temperature controlled air bag type constant pressure accumulator as claimed in claim 1, wherein: the lower shell (2) is connected with the lower end cover (4) through a threaded ring, and a check ring and an O-shaped rubber sealing ring are arranged between the lower shell (2) and the lower end cover (4).
7. The temperature controlled air bag type constant pressure accumulator as claimed in claim 1, wherein: go up between casing (1) and the lower casing (2) through bolted connection, and the junction of going up casing (1) and lower casing (2) is "v" type.
8. The temperature controlled air bag type constant pressure accumulator as claimed in claim 1, wherein: the air bag (9) adopts a foldable and telescopic structure, a gap is reserved between the outer walls of the two sides of the air bag (9) and the inner wall of the lower shell (2), and the thickness of the bottom of the air bag (9) is larger than that of the side wall.
9. The temperature controlled air bag type constant pressure accumulator as claimed in claim 1, wherein: prevent scalding cover (13) and be tube-shape hollow out construction, prevent scalding the bottom mould of the upper end of cover (13) and upper end cover (3) and press as an organic whole.
10. The temperature controlled air bag type constant pressure accumulator as claimed in claim 1, wherein: the two outer sides of the lower shell (2) are replaced by composite material layers (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN112377471A (en) * | 2020-12-07 | 2021-02-19 | 青岛理工大学 | Hydraulic mechanical energy storage device |
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